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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2010	Jan. 31, 2011	Jun. 30, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	M&T BANK CORP
Entity Central Index Key	0000036270
Document Type	10-K
Document Period End Date	Dec. 31, 2010
Amendment Flag	false
Document Fiscal Year Focus	2010
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 6,778,614,643
Entity Common Stock, Shares Outstanding		120,207,579

Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Assets
Cash and due from banks	$ 908,755	$ 1,226,223
Interest-bearing deposits at banks	101,222	133,335
Federal funds sold	25,000	20,119
Trading account	523,834	386,984
Investment securities (includes pledged securities that can be sold or repledged of $1,937,817 in 2010; $1,797,701 in 2009)
Available for sale (cost: $5,494,377 in 2010; $6,997,009 in 2009)	5,413,492	6,704,378
Held to maturity (fair value: $1,225,253 in 2010; $416,483 in 2009)	1,324,339	567,607
Other (fair value: $412,709 in 2010; $508,624 in 2009)	412,709	508,624
Total investment securities	7,150,540	7,780,609
Loans and leases	52,315,942	52,306,457
Unearned discount	(325,560)	(369,771)
Loans and leases, net of unearned discount	51,990,382	51,936,686
Allowance for credit losses	(902,941)	(878,022)
Loans and leases, net	51,087,441	51,058,664
Premises and equipment	435,837	435,845
Goodwill	3,524,625	3,524,625
Core deposit and other intangible assets	125,917	182,418
Accrued interest and other assets	4,138,092	4,131,577
Total assets	68,021,263	68,880,399
Liabilities
Noninterest-bearing deposits	14,557,568	13,794,636
NOW accounts	1,393,349	1,396,471
Savings deposits	26,431,281	23,676,798
Time deposits	5,817,170	7,531,495
Deposits at Cayman Islands office	1,605,916	1,050,438
Total deposits	49,805,284	47,449,838
Federal funds purchased and agreements to repurchase securities	866,555	2,211,692
Other short-term borrowings	80,877	230,890
Accrued interest and other liabilities	1,070,701	995,056
Long-term borrowings	7,840,151	10,240,016
Total liabilities	59,663,568	61,127,492
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized, 778,000 shares issued and outstanding in 2010 and 2009 (liquidation preference $1,000 per share)	740,657	730,235
Common stock, $.50 par, 250,000,000 shares authorized, 120,396,611 shares issued in 2010 and 2009	60,198	60,198
Common stock issuable, 71,345 shares in 2010; 75,170 shares in 2009	4,189	4,342
Additional paid-in capital	2,398,615	2,442,947
Retained earnings	5,426,701	5,076,884
Accumulated other comprehensive income (loss), net	(205,220)	(335,997)
Treasury stock - common, at cost -693,974 shares in 2010; 2,173,916 shares in 2009	(67,445)	(225,702)
Total shareholders' equity	8,357,695	7,752,907
Total liabilities and shareholders' equity	$ 68,021,263	$ 68,880,399

Consolidated Balance Sheet (Parenthetical) - USD ($)	Dec. 31, 2010	Dec. 31, 2009
Assets
Pledged securities that can be sold or repledged	$ 1,937,817,000	$ 1,797,701,000
Investment securities, available for sale, amortized cost	5,494,377,000	6,997,009,000
Investment securities, held to maturity, fair value	1,225,253,000	416,483,000
Other debt securities fair value	412,709,000	508,624,000
Shareholders' equity
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	778,000	778,000
Preferred stock, shares outstanding	778,000	778,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Commmon stock, par value	$ 0.50	$ 0.50
Commmon stock, shares authorized	250,000,000	250,000,000
Commmon stock, shares issued	120,396,611	120,396,611
Common stock issuable, shares	71,345	75,170
Treasury stock - common, shares	693,974	2,173,916

Consolidated Statement of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statement of Income - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Interest income
Loans and leases, including fees	$ 2,394,082	$ 2,326,748	$ 2,825,587
Deposits at banks	88	34	109
Federal funds sold	42	63	254
Agreements to resell securities	404	66	1,817
Trading account	615	534	1,469
Investment securities
Fully taxable	324,695	389,268	438,409
Exempt from federal taxes	9,869	8,484	9,946
Total interest income	2,729,795	2,725,197	3,277,591
Interest expense
NOW accounts	850	1,122	2,894
Savings deposits	85,226	112,550	248,083
Time deposits	100,241	206,220	330,389
Deposits at Cayman Islands office	1,368	2,391	84,483
Short-term borrowings	3,006	7,129	142,627
Long-term borrowings	271,578	340,037	529,319
Total interest expense	462,269	669,449	1,337,795
Net interest income	2,267,526	2,055,748	1,939,796
Provision for credit losses	368,000	604,000	412,000
Net interest income after provision for credit losses	1,899,526	1,451,748	1,527,796
Other income
Mortgage banking revenues	184,625	207,561	156,012
Service charges on deposit accounts	478,133	469,195	430,532
Trust income	122,613	128,568	156,149
Brokerage services income	49,669	57,611	64,186
Trading account and foreign exchange gains	27,286	23,125	17,630
Gain on bank investment securities	2,770	1,165	34,471
Total other-than-temporary impairment ("OTTI") losses	(115,947)	(264,363)	(182,222)
Portion of OTTI losses recognized in other comprehensive income (before taxes)	29,666	126,066
Net OTTI losses recognized in earnings	(86,281)	(138,297)	(182,222)
Equity in earnings of Bayview Lending Group LLC	(25,768)	(25,898)	(37,453)
Other revenues from operations	355,053	325,076	299,674
Total other income	1,108,100	1,048,106	938,979
Other expense
Salaries and employee benefits	999,709	1,001,873	957,086
Equipment and net occupancy	216,064	211,391	188,845
Printing, postage and supplies	33,847	38,216	35,860
Amortization of core deposit and other intangible assets	58,103	64,255	66,646
FDIC assessments	79,324	96,519	6,689
Other costs of operations	527,790	568,309	471,870
Total other expense	1,914,837	1,980,563	1,726,996
Income before taxes	1,092,789	519,291	739,779
Income taxes	356,628	139,400	183,892
Net income	736,161	379,891	555,887
Net income available to common shareholders
Basic	675,826	332,006	555,096
Diluted	$ 675,853	$ 332,006	$ 555,096
Net income per common share
Basic	$ 5.72	$ 2.90	$ 5.04
Diluted	$ 5.69	$ 2.89	$ 5.01

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Cash flows from operating activities
Net income	$ 736,161	$ 379,891	$ 555,887
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	368,000	604,000	412,000
Depreciation and amortization of premises and equipment	67,677	64,398	53,422
Amortization of capitalized servicing rights	56,582	62,268	65,722
Amortization of core deposit and other intangible assets	58,103	64,255	66,646
Provision for deferred income taxes	51,068	82,501	(17,020)
Asset write-downs	101,106	171,225	190,079
Net gain on sales of assets	(10,426)	(88)	(24,961)
Net change in accrued interest receivable, payable	(9,942)	(38,920)	15,023
Net change in other accrued income and expense	144,705	(154,992)	(201,402)
Net change in loans originated for sale	202,089	(57,105)	471,543
Net change in trading account assets and liabilities	(89,476)	11,956	41,477
Net cash provided by operating activities	1,675,647	1,189,389	1,628,416
Cash flows from investing activities
Proceeds from sales of available for sale investment securities	23,310	9,427	57,843
Proceeds from sales of other investment securities	107,320	137,577	115,207
Proceeds from maturities of available for sale investment securities	1,539,591	2,187,553	1,908,725
Proceeds from maturities of held to maturity investment securities	248,087	125,466	92,343
Purchases of available for sale investment securities	(440,560)	(651,549)	(836,448)
Purchases of held to maturity investment securities	(1,003,796)	(37,453)	(198,418)
Purchases of other investment securities	(7,647)	(21,088)	(191,995)
Net (increase) decrease in agreements to resell securities		90,000	(90,000)
Net (increase) decrease in loans and leases	(201,854)	657,458	(2,873,642)
Net (increase) decrease in interest-bearing deposits at banks	32,113	(123,051)	8,147
Other investments, net	(52,179)	(35,934)	(35,649)
Additions to capitalized servicing rights	(594)	(379)	(24,349)
Capital expenditures, net	(70,458)	(58,967)	(72,234)
Acquisitions, net of cash acquired Banks and bank holding companies	213,204	202,993
Other, net	88,873	19,642	(123,289)
Net cash provided (used) by investing activities	475,410	2,501,695	(2,263,759)
Cash flows from financing activities
Net increase (decrease) in deposits	1,879,491	(528,964)	1,317,764
Net decrease in short-term borrowings	(1,522,646)	(745,251)	(2,811,736)
Proceeds from long-term borrowings	1,387		3,850,010
Payments on long-term borrowings	(2,515,729)	(2,390,182)	(2,216,978)
Dividends paid - common	(335,303)	(325,706)	(308,501)
Dividends paid - preferred	(40,225)	(31,946)
Proceeds from issuance of preferred stock and warrants			600,000
Other, net	69,381	9,156	5,388
Net cash provided (used) by financing activities	(2,463,644)	(4,012,893)	435,947
Net decrease in cash and cash equivalents	(312,587)	(321,809)	(199,396)
Cash and cash equivalents at beginning of year	1,246,342	1,568,151	1,767,547
Cash and cash equivalents at end of year	933,755	1,246,342	1,568,151
Supplemental disclosure of cash flow information
Interest received during the year	2,765,101	2,748,880	3,374,219
Interest paid during the year	490,767	704,173	1,363,351
Income taxes paid (refunded) during the year	287,740	(19,549)	290,324
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	199,285	102,392	142,517
Acquisitions, Fair value of:
Assets acquired (noncash)	342,443	6,581,433
Liabilities assumed	528,108	6,318,998
Preferred stock issued		155,779
Common stock issued		272,824
Common stock options		1,367
Common stock warrants		6,467
Increase (decrease) from consolidation of securitization trusts
Loans	423,865
Investment securities-available for sale	(360,471)
Long-term borrowings	65,419
Accrued interest and other	$ 2,025
Securitization of residential mortgage loans allocated to: Available for sale investment securities		140,942	866,169
Securitization of residential mortgage loans allocated to: Capitalized servicing rights		$ 788	8,455
Investment securities available for sale transferred to held to maturity			$ 298,108

Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statement [Line Items]
Beginning Balance	$ 7,752,907	$ 6,784,731	$ 6,485,256
Comprehensive income:
Net income	736,161	379,891	555,887
Other comprehensive income, net of tax and reclassification adjustments:
Unrealized gains (losses) on investment securities	134,904	337,043	(497,262)
Defined benefit plans liability adjustment	(3,846)	57,284	(127,845)
Unrealized losses (gains) on terminated cash flow hedges	(281)	6,557	3,048
Other comprehensive income	866,938	780,775	(66,172)
Acquisition of Provident Bankshares Corporation:
Preferred stock issued		155,779
Common stock issued		272,824
Common stock options		1,367
Common stock warrants		6,467
Issuance of common stock to defined benefit pension plan		44,289
Preferred stock cash dividends	(40,225)	(31,946)
Issuance of preferred stock and associated warrants			600,000
Repayment of management stock ownership program receivable	3,783	195	72
Stock-based compensation plans:
Compensation expense	54,335	53,505	49,627
Exercises of stock options	50,620	10,234	23,005
Stock purchase plan	8,998
Directors' stock plan	1,117	1,251	1,347
Deferred compensation plans, net, including dividend equivalents	(14)	53	97
Other	(5,262)
Common stock cash dividends - $2.80 per share	(335,502)	(326,617)	(308,501)
Ending Balance	8,357,695	7,752,907	6,784,731
Preferred Stock
Statement [Line Items]
Beginning Balance	730,235	567,463	0
Acquisition of Provident Bankshares Corporation:
Preferred stock issued		155,779
Amortization of preferred stock discount	10,422	6,993
Issuance of preferred stock and associated warrants			567,463
Stock-based compensation plans:
Ending Balance	740,657	730,235	567,463
Common Stock
Statement [Line Items]
Beginning Balance	60,198	60,198	60,198
Stock-based compensation plans:
Ending Balance	60,198	60,198	60,198
Common Stock Issuable
Statement [Line Items]
Beginning Balance	4,342	4,617	4,776
Stock-based compensation plans:
Deferred compensation plans, net, including dividend equivalents	(153)	(275)	(159)
Ending Balance	4,189	4,342	4,617
Additional Paid-in Capital
Statement [Line Items]
Beginning Balance	2,442,947	2,897,907	2,848,752
Acquisition of Provident Bankshares Corporation:
Common stock issued		(348,080)
Common stock options		1,367
Common stock warrants		6,467
Issuance of common stock to defined benefit pension plan		(51,417)
Issuance of preferred stock and associated warrants			32,537
Repayment of management stock ownership program receivable	3,783	195	72
Stock-based compensation plans:
Compensation expense	5,491	(21,773)	46,025
Exercises of stock options	(46,248)	(39,936)	(28,543)
Stock purchase plan	(8,482)
Directors' stock plan	(362)	(1,280)	(450)
Deferred compensation plans, net, including dividend equivalents	(305)	(503)	(486)
Other	1,791
Ending Balance	2,398,615	2,442,947	2,897,907
Retained Earnings
Statement [Line Items]
Beginning Balance	5,076,884	5,062,754	4,815,585
Comprehensive income:
Net income	736,161	379,891	555,887
Acquisition of Provident Bankshares Corporation:
Preferred stock cash dividends	(40,225)	(31,946)
Amortization of preferred stock discount	(10,422)	(6,993)
Stock-based compensation plans:
Deferred compensation plans, net, including dividend equivalents	(195)	(205)	(217)
Common stock cash dividends - $2.80 per share	(335,502)	(326,617)	(308,501)
Ending Balance	5,426,701	5,076,884	5,062,754
Accumulated Other Comprehensive Income (Loss), Net
Statement [Line Items]
Beginning Balance	(335,997)	(736,881)	(114,822)
Other comprehensive income, net of tax and reclassification adjustments:
Unrealized gains (losses) on investment securities	134,904	337,043	(497,262)
Defined benefit plans liability adjustment	(3,846)	57,284	(127,845)
Unrealized losses (gains) on terminated cash flow hedges	(281)	6,557	3,048
Stock-based compensation plans:
Ending Balance	(205,220)	(335,997)	(736,881)
Treasury Stock
Statement [Line Items]
Beginning Balance	(225,702)	(1,071,327)	(1,129,233)
Acquisition of Provident Bankshares Corporation:
Common stock issued		620,904
Issuance of common stock to defined benefit pension plan		95,706
Stock-based compensation plans:
Compensation expense	48,844	75,278	3,602
Exercises of stock options	96,868	50,170	51,548
Stock purchase plan	17,480
Directors' stock plan	1,479	2,531	1,797
Deferred compensation plans, net, including dividend equivalents	639	1,036	959
Other	(7,053)
Ending Balance	$ (67,445)	$ (225,702)	$ (1,071,327)

Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Retained Earnings
Statement [Line Items]
Common stock per share dividend amount	$ 2.80	$ 2.80	$ 2.80

Significant accounting policies

12 Months Ended

Dec. 31, 2010

Significant accounting policies [Abstract]

Significant accounting policies


1.	Significant accounting policies

M&T Bank Corporation (“M&T”) is a bank holding company headquartered in Buffalo, New York. Through subsidiaries, M&T provides individuals, corporations and other businesses, and institutions with commercial and retail banking services, including loans and deposits, trust, mortgage banking, asset management, insurance and other financial services. Banking activities are largely focused on consumers residing in New York State, Pennsylvania, Maryland, Virginia and the District of Columbia and on small and medium-size businesses based in those areas. Banking services are also provided in Delaware, West Virginia and New Jersey, while certain subsidiaries also conduct activities in other areas.

The accounting and reporting policies of M&T and subsidiaries (“the Company”) conform to generally accepted accounting principles (“GAAP”) and to general practices within the banking industry. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The more significant accounting policies are as follows:

Consolidation

The consolidated financial statements include M&T and all of its subsidiaries. All significant intercompany accounts and transactions of consolidated subsidiaries have been eliminated in consolidation. The financial statements of M&T included in note 26 report investments in subsidiaries under the equity method. Information about some limited purpose entities that are affiliates of the Company but are not included in the consolidated financial statements appears in note 19.

Consolidated Statement of Cash Flows

For purposes of this statement, cash and due from banks and federal funds sold are considered cash and cash equivalents.

Securities purchased under agreements to resell and securities sold under agreements to repurchase

Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions and are recorded at amounts equal to the cash or other consideration exchanged. It is generally the Company’s policy to take possession of collateral pledged to secure agreements to resell.

Trading account

Financial instruments used for trading purposes are stated at fair value. Realized gains and losses and unrealized changes in fair value of financial instruments utilized in trading activities are included in “trading account and foreign exchange gains” in the consolidated statement of income.

Investment securities

Investments in debt securities are classified as held to maturity and stated at amortized cost when management has the positive intent and ability to hold such securities to maturity. Investments in other debt securities and equity securities having readily determinable fair values are classified as available for sale and stated at estimated fair value. Amortization of premiums and accretion of discounts for investment securities available for sale and held to maturity are included in interest income. Except for investment securities for which the Company has entered into a related fair value hedge, unrealized gains or losses on investment securities available for sale are reflected in accumulated other comprehensive income (loss), net of applicable income taxes.

Other securities are stated at cost and include stock of the Federal Reserve Bank of New York and the Federal Home Loan Bank (“FHLB”) of New York.

The cost basis of individual securities is written down through a charge to earnings when declines in value below amortized cost are considered to be other than temporary. In cases where fair value is less than amortized cost and the Company intends to sell a debt security, it is more likely than not to be required to sell a debt security before recovery of its amortized cost basis, or the Company does not expect to recover the entire amortized cost basis of a debt security, an other-than-temporary impairment is considered to have occurred. If the Company intends to sell the debt security or more likely than not will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary impairment is recognized in earnings equal to the entire difference between the debt security’s amortized cost basis and its fair value at the balance sheet date. If the Company does not expect to recover the entire amortized cost basis of the security, the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary impairment is separated into (a) the amount representing the credit loss and (b) the amount related to all other factors. The amount of the other-than-temporary impairment related to the credit loss is recognized in earnings while the amount related to other factors is recognized in other comprehensive income, net of applicable taxes. Subsequently, the Company accounts for the other-than-temporarily impaired debt security as if the security had been purchased on the measurement date of the other-than-temporary impairment at an amortized cost basis equal to the previous amortized cost basis less the other-than-temporary impairment recognized in earnings. The cost basis of individual equity securities is written down to estimated fair value through a charge to earnings when declines in value below cost are considered to be other than temporary. Realized gains and losses on the sales of investment securities are determined using the specific identification method.

Loans and leases

Interest income on loans is accrued on a level yield method. Loans are placed on nonaccrual status and previously accrued interest thereon is charged against income when principal or interest is delinquent 90 days, unless management determines that the loan status clearly warrants other treatment. Loan balances are charged off when it becomes evident that such balances are not fully collectible. For loans secured by residential real estate, the excess of the loan balances over the net realizable value of the property collateralizing the loan is charged-off when the loan becomes 150 days delinquent. Loan fees and certain direct loan origination costs are deferred and recognized as an interest yield adjustment over the life of the loan. Net deferred fees have been included in unearned discount as a reduction of loans outstanding. Commitments to sell real estate loans are utilized by the Company to hedge the exposure to changes in fair value of real estate loans held for sale. The carrying value of hedged real estate loans held for sale recorded in the consolidated balance sheet includes changes in estimated fair market value during the hedge period, typically from the date of close through the sale date. Valuation adjustments made on these loans and commitments are included in “mortgage banking revenues.”

Except for consumer and residential mortgage loans that are considered smaller balance homogenous loans and are evaluated collectively and purchased-impaired loans, the Company considers a loan to be impaired for purposes of applying GAAP when, based on current information and events, it is probable that the Company will be unable to collect all amounts according to the contractual terms of the loan agreement or the loan is delinquent 90 days. Purchased-impaired loans are considered impaired under GAAP when it is probable that the Company will be unable to collect all cash flows expected at acquisition plus additional cash flows expected to be collected arising from changes in estimates after acquisition. Regardless of loan type, the Company considers a loan to be impaired if it qualifies as a troubled debt restructuring. Impaired loans are classified as either nonaccrual or as loans renegotiated at below market rates, with the exception of purchased-impaired loans which continue to accrete income in accordance with GAAP. Certain loans greater than 90 days delinquent are not considered impaired if they are both well-secured and in the process of collection. Loans less than 90 days delinquent are deemed to have an insignificant delay in payment and are generally not considered impaired. Impairment of a loan is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of collateral if the loan is collateral-dependent. Interest received on impaired loans placed on nonaccrual status is generally applied to reduce the carrying value of the loan or, if principal is considered fully collectible, recognized as interest income.

Due to changes in GAAP for loans acquired in a business combination subsequent to December 31, 2008, the excess of cash flows expected at acquisition over the estimated fair value is recognized as interest income over the remaining lives of the loans. Because those loans are recorded at fair value, no carry-over of an acquired entity’s previously established allowance for credit losses may be recorded. Subsequent decreases in the expected cash flows require the Company to evaluate the need for additions to the Company’s allowance for credit losses. Subsequent improvements in expected cash flows result in the recognition of additional interest income over the then remaining lives of the loans.

Residual value estimates for commercial leases are generally determined through internal or external reviews of the leased property. The Company reviews commercial lease residual values at least annually and recognizes residual value impairments deemed to be other than temporary.

Allowance for credit losses

The allowance for credit losses represents the amount which, in management’s judgment, will be adequate to absorb credit losses inherent in the loan and lease portfolio as of the balance sheet date. The adequacy of the allowance is determined by management’s evaluation of the loan and lease portfolio based on such factors as the differing economic risks associated with each loan category, the current financial condition of specific borrowers, the economic environment in which borrowers operate, the level of delinquent loans, the value of any collateral and, where applicable, the existence of any guarantees or indemnifications.

Assets taken in foreclosure of defaulted loans

Assets taken in foreclosure of defaulted loans are primarily comprised of commercial and residential real property and are included in “other assets” in the consolidated balance sheet. Upon acquisition of assets taken in satisfaction of a defaulted loan, the excess of the remaining loan balance over the asset’s estimated fair value less costs to sell is charged off against the allowance for credit losses. Subsequent declines in value of the assets are recognized as “other expense” in the consolidated statement of income.

Premises and equipment

Premises and equipment are stated at cost less accumulated depreciation. Depreciation expense is computed principally using the straight-line method over the estimated useful lives of the assets.

Capitalized servicing rights

Capitalized servicing assets are included in “other assets” in the consolidated balance sheet. Separately recognized servicing assets are initially measured at fair value. The Company uses the amortization method to subsequently measure servicing assets. Under that method, capitalized servicing assets are charged to expense in proportion to and over the period of estimated net servicing income.

To estimate the fair value of servicing rights, the Company considers market prices for similar assets and the present value of expected future cash flows associated with the servicing rights calculated using assumptions that market participants would use in estimating future servicing income and expense. Such assumptions include estimates of the cost of servicing loans, loan default rates, an appropriate discount rate, and prepayment speeds. For purposes of evaluating and measuring impairment of capitalized servicing rights, the Company stratifies such assets based on the predominant risk characteristics of the underlying financial instruments that are expected to have the most impact on projected prepayments, cost of servicing and other factors affecting future cash flows associated with the servicing rights. Such factors may include financial asset or loan type, note rate and term. The amount of impairment recognized is the amount by which the carrying value of the capitalized servicing rights for a stratum exceeds estimated fair value. Impairment is recognized through a valuation allowance.

Sales and securitizations of financial assets

Due to changes in GAAP, transfers of financial assets that occur on or after January 1, 2010 for which the Company has surrendered control of the financial assets are accounted for as sales. Interests in a sale of financial assets that continue to be held by the Company, including servicing rights, are measured at fair value. Prior to January 1, 2010, transfers of financial assets for which the Company had surrendered control of the financial assets were accounted for as sales to the extent that consideration other than beneficial interests in the transferred assets was received in exchange. Interests in a sale or securitization of financial assets that continued to be held by the Company, other than servicing rights which were initially measured at fair value, were measured at the date of transfer by allocating the previous carrying amount between the assets transferred and the retained interests based on their relative estimated fair values. The fair values of retained debt securities are generally determined through reference to independent pricing information. The fair values of retained servicing rights and any other retained interests are determined based on the present value of expected future cash flows associated with those interests and by reference to market prices for similar assets.

Also due to changes in GAAP, for transfers of financial assets that occur on or after January 1, 2010 the exception that permitted sale accounting for certain mortgage securitizations when a transferor has not surrendered control over the transferred assets was eliminated. The change in GAAP also eliminated the concept of qualifying special-purpose entities. As a result, beginning January 1, 2010, all formerly qualifying special-purpose entities had to be re-evaluated in accordance with the applicable consolidation guidance. Additional information on the effects of this accounting change and changes in the accounting guidance relating to the consolidation of variable interest entities is included in note 19.

Goodwill and core deposit and other intangible assets

Goodwill represents the excess of the cost of an acquired entity over the fair value of the identifiable net assets acquired. Goodwill is not amortized, but rather is tested for impairment at least annually at the reporting unit level, which is either at the same level or one level below an operating segment. Other acquired intangible assets with finite lives, such as core deposit intangibles, are initially recorded at estimated value and are amortized over their estimated lives. Core deposit and other intangible assets are generally amortized using accelerated methods over estimated useful lives of five to ten years. The Company periodically assesses whether events or changes in circumstances indicate that the carrying amounts of core deposit and other intangible assets may be impaired.

Derivative financial instruments

The Company accounts for derivative financial instruments at fair value. If certain conditions are met, a derivative may be specifically designated as (a) a hedge of the exposure to changes in the fair value of a recognized asset or liability or an unrecognized firm commitment, (b) a hedge of the exposure to variable cash flows of a forecasted transaction or (c) a hedge of the foreign currency exposure of a net investment in a foreign operation, an unrecognized firm commitment, an available for sale security, or a foreign currency denominated forecasted transaction.

The Company utilizes interest rate swap agreements as part of the management of interest rate risk to modify the repricing characteristics of certain portions of its portfolios of earning assets and interest-bearing liabilities. For such agreements, amounts receivable or payable are recognized as accrued under the terms of the agreement and the net differential is recorded as an adjustment to interest income or expense of the related asset or liability. Interest rate swap agreements may be designated as either fair value hedges or cash flow hedges. In a fair value hedge, the fair values of the interest rate swap agreements and changes in the fair values of the hedged items are recorded in the Company’s consolidated balance sheet with the corresponding gain or loss recognized in current earnings. The difference between changes in the fair values of interest rate swap agreements and the hedged items represents hedge ineffectiveness and is recorded in “other revenues from operations” in the consolidated statement of income. In a cash flow hedge, the effective portion of the derivative’s unrealized gain or loss is initially recorded as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings. The ineffective portion of the unrealized gain or loss is reported in “other revenues from operations” immediately.

The Company utilizes commitments to sell real estate loans to hedge the exposure to changes in the fair value of real estate loans held for sale. Commitments to originate real estate loans to be held for sale and commitments to sell real estate loans are generally recorded in the consolidated balance sheet at estimated fair market value.

Derivative instruments not related to mortgage banking activities, including financial futures commitments and interest rate swap agreements, that do not satisfy the hedge accounting requirements are recorded at fair value and are generally classified as trading account assets or liabilities with resultant changes in fair value being recognized in “trading account and foreign exchange gains” in the consolidated statement of income.

Stock-based compensation

Stock-based compensation expense is recognized over the vesting period of the stock-based grant based on the estimated grant date value of the stock-based compensation that is expected to vest, except that the recognition of compensation costs is accelerated for stock-based awards granted to retirement-eligible employees and employees who will become retirement-eligible prior to full vesting of the award because the Company’s incentive compensation plan allows for vesting at the time an employee retires. Information on the determination of the estimated value of stock-based awards used to calculate stock-based compensation expense is included in note 11.

Income taxes

Deferred tax assets and liabilities are recognized for the future tax effects attributable to differences between the financial statement value of existing assets and liabilities and their respective tax bases and carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates and laws.

The Company evaluates uncertain tax positions using the two-step process required by GAAP. The first step requires a determination of whether it is more likely than not that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Under the second step, a tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. Information related to uncertain tax positions is provided in note 13.

Earnings per common share

Basic earnings per common share exclude dilution and are computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding (exclusive of shares represented by the unvested portion of restricted stock and restricted stock unit grants) and common shares issuable under deferred compensation arrangements during the period. Diluted earnings per common share reflect shares represented by the unvested portion of restricted stock and restricted stock unit grants and the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in earnings. Proceeds assumed to have been received on such exercise or conversion are assumed to be used to purchase shares of M&T common stock at the average market price during the period, as required by the “treasury stock method” of accounting.

GAAP requires that for financial statements issued for fiscal years beginning after December 15, 2008 and interim periods within those years, unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) shall be considered participating securities and shall be included in the computation of earnings per common share pursuant to the two-class method. In 2009 and 2010, the Company issued stock-based compensation awards in the form of restricted stock and restricted stock units that contain such rights and, accordingly, beginning in 2009 the Company’s earnings per common share are calculated using the two-class method. The effects of the application of the two-class method to earnings per common share amounts for prior years were immaterial.

Treasury stock

Repurchases of shares of M&T common stock are recorded at cost as a reduction of shareholders’ equity. Reissuances of shares of treasury stock are recorded at average cost.

Acquisitions

12 Months Ended

Dec. 31, 2010

Acquisitions [Abstract]

Acquisitions


2.	Acquisitions

On November 5, 2010, M&T Bank, M&T’s principal banking subsidiary, entered into a purchase and assumption agreement with the Federal Deposit Insurance Corporation (“FDIC”) to assume all of the deposits, except certain brokered deposits, and acquire certain assets of K Bank, based in Randallstown, Maryland. As part of the transaction, M&T Bank entered into a loss-share arrangement with the FDIC whereby M&T Bank will be reimbursed by the FDIC for most losses it incurs on the acquired loan portfolio. The transaction was accounted for using the acquisition method of accounting and, accordingly, assets acquired and liabilities assumed were recorded at estimated fair value on the acquisition date. Assets acquired in the transaction totaled approximately $556 million, including $154 million of loans and $186 million in cash, and liabilities assumed aggregated $528 million, including $491 million of deposits. In accordance with GAAP, M&T Bank recorded an after-tax gain on the transaction of $17 million ($28 million before taxes). The gain reflects the amount of financial support and indemnification against loan losses that M&T Bank obtained from the FDIC. There was no goodwill or other intangible assets recorded in connection with this transaction. The operations obtained in the K Bank acquisition transaction did not have a material impact on the Company’s consolidated financial position or results of operations.

On November 1, 2010, M&T entered into a definitive agreement with Wilmington Trust Corporation (“Wilmington Trust”), headquartered in Wilmington, Delaware, under which Wilmington Trust will be acquired by M&T. Pursuant to the terms of the agreement, Wilmington Trust common shareholders will receive .051372 shares of M&T common stock in exchange for each share of Wilmington Trust common stock in a stock-for-stock transaction valued at $351 million (with the price based on M&T’s closing price of $74.75 per share as of October 29, 2010), plus the assumption of $330 million in preferred stock issued by Wilmington Trust as part of the Troubled Asset Relief Program — Capital Purchase Program of the U.S. Department of Treasury (“U.S. Treasury”).

At December 31, 2010, Wilmington Trust had approximately $10.9 billion of assets, including $7.5 billion of loans, $10.1 billion of liabilities, including $9.0 billion of deposits, and $60.1 billion of combined assets under management, including $43.6 billion managed by Wilmington Trust and $16.5 billion managed by affiliates. The merger is subject to a number of conditions, including the approval of various state and Federal regulators and Wilmington Trust’s common shareholders, and is expected to be completed by mid-year 2011.

On August 28, 2009, M&T Bank entered into a purchase and assumption agreement with the FDIC to assume all of the deposits and acquire certain assets of Bradford Bank (“Bradford”), Baltimore, Maryland. As part of the transaction, M&T Bank entered into a loss-share arrangement with the FDIC whereby M&T Bank will be reimbursed by the FDIC for most losses it incurs on the acquired loan portfolio. The transaction was accounted for using the acquisition method of accounting and, accordingly, assets acquired and liabilities assumed were recorded at estimated fair value on the acquisition date. Assets acquired totaled approximately $469 million, including $302 million of loans, and liabilities assumed aggregated $440 million, including $361 million of deposits. In accordance with GAAP, M&T Bank recorded an after-tax gain on the transaction of $18 million ($29 million before taxes). There was no goodwill or other intangible assets recorded in connection with this transaction. The operations obtained in the Bradford acquisition transaction did not have a material impact on the Company’s consolidated financial position or results of operations.

On May 23, 2009, M&T acquired all of the outstanding common stock of Provident Bankshares Corporation (“Provident”), a bank holding company based in Baltimore, Maryland, in a stock-for-stock transaction. Provident Bank, Provident’s banking subsidiary, was merged into M&T Bank on that date. The results of operations acquired in the Provident transaction have been included in the Company’s financial results since May 23, 2009. Provident common shareholders received .171625 shares of M&T common stock in exchange for each share of Provident common stock, resulting in M&T issuing a total of 5,838,308 common shares with an acquisition date fair value of $273 million. In addition, based on the merger agreement, outstanding and unexercised options to purchase Provident common stock were converted into options to purchase the common stock of M&T. Those options had an estimated fair value of $1 million. In total, the purchase price was approximately $274 million based on the fair value on the acquisition date of M&T common stock exchanged and the options to purchase M&T common stock. Holders of Provident’s preferred stock were issued shares of new Series B and Series C Preferred Stock of M&T having substantially identical terms. That preferred stock and warrants to purchase common stock associated with the Series C Preferred Stock added $162 million to M&T’s shareholders’ equity.

The Provident transaction was accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the acquisition date. Assets acquired totaled $6.3 billion, including $4.0 billion of loans and leases (including approximately $1.7 billion of commercial real estate loans, $1.4 billion of consumer loans, $700 million of commercial loans and leases and $300 million of residential real estate loans) and $1.0 billion of investment securities. Liabilities assumed were $5.9 billion, including $5.1 billion of deposits. The transaction added $436 million to M&T’s shareholders’ equity, including $280 million of common equity and $156 million of preferred equity. In connection with the acquisition, the Company recorded $332 million of goodwill and $63 million of core deposit intangible. The core deposit intangible is being amortized over seven years using an accelerated method. The acquisition of Provident expanded the Company’s presence in the Mid-Atlantic area, gave the Company the second largest deposit share in Maryland, and tripled the Company’s presence in Virginia.

In many cases, determining the fair value of the acquired assets and assumed liabilities required the Company to estimate cash flows expected to result from those assets and liabilities and to discount those cash flows at appropriate rates of interest. The most significant of those determinations related to the fair valuation of acquired loans. For such loans, the excess of cash flows expected at acquisition over the estimated fair value is recognized as interest income over the remaining lives of the loans. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition reflects the impact of estimated credit losses and other factors, such as prepayments. In accordance with GAAP, there was no carry-over of Provident’s previously established allowance for credit losses.

In conjunction with the Provident acquisition, the acquired loan portfolio was accounted for at fair value as follows:


	May 23, 2009
	(In thousands)

Contractually required principal and interest at acquisition	$	5,465,167
Contractual cash flows not expected to be collected		(832,115	)

Expected cash flows at acquisition		4,633,052
Interest component of expected cash flows		(595,685	)

Basis in acquired loans at acquisition — estimated fair value	$	4,037,367

Interest income on acquired loans for the year ended December 31, 2010 was approximately $162 million. For the period from the date of acquisition to December 31, 2009, interest income on such loans was approximately $105 million. The outstanding principal balance and the carrying amount of these loans that is included in the consolidated balance sheet is as follows:


	December 31
	2010		2009
	(In thousands)

Outstanding principal balance	$	3,139,025	$	3,875,415
Carrying amount		2,966,754		3,644,110

Receivables (including loans and investment securities) obtained in the acquisition of Provident for which there was specific evidence of credit deterioration and for which it was probable that the Company would be unable to collect all contractually required principal and interest payments represent less than .25% of the Company’s assets and, accordingly, are not considered material.

The following table discloses the impact of Provident (excluding the impact of merger-related expenses) since the acquisition on May 23, 2009 through the end of 2009. The table also presents certain pro forma information for 2009 as if Provident had been acquired on January 1, 2009 and for 2008 as if Provident had been acquired on January 1, 2008. These results combine the historical results of Provident into the Company’s consolidated statement of income and, while certain adjustments were made for the estimated impact of certain fair valuation adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on the indicated dates. In particular, no adjustments have been made to eliminate the amount of Provident’s provision for credit losses of $42 million in 2009 and $38 million in 2008 or the impact of other-than-temporary impairment losses recognized by Provident of $87 million in 2009 and $121 million in 2008 that would not have been necessary had the acquired loans and investment securities been recorded at fair value as of the beginning of each year. Furthermore, expenses related to systems conversions and other costs of integration are included in the 2009 periods in which such costs were incurred. Additionally, the Company expects to achieve further operating cost savings and other business synergies as a result of the acquisition which are not reflected in the pro forma amounts that follow.


			Pro Forma
	Actual Since		Year Ended
	Acquisition Through		December 31
	December 31, 2009		2009		2008
	(In thousands)

Total revenues	$	194,578	$	3,823,763	$	4,533,161
Net income		32,686		292,862		510,897

The Company incurred merger-related expenses related to systems conversions and other costs of integrating and conforming acquired operations with and into the Company of approximately $771 thousand ($469 thousand net of applicable income taxes) during 2010, $89 million ($54 million net of applicable income taxes) during 2009 and $4 million ($2 million net of applicable income taxes) during 2008. Those expenses consisted largely of professional services and other temporary help fees associated with the conversion of systems and/or integration of operations; costs related to branch and office consolidations; costs related to termination of existing contractual arrangements for various services; initial marketing and promotion expenses designed to introduce M&T Bank to its new customers; severance (for former Provident employees) and incentive compensation costs; travel costs; and printing, postage, supplies and other costs of commencing operations in new markets and offices. The remaining unpaid portion of merger-related expenses at December 31, 2010 was not significant.

A summary of merger-related expenses associated with acquisitions included in the consolidated statement of income for the years ended December 31, 2010, 2009 and 2008 follows:


	2010		2009		2008
	(In thousands)

Salaries and employee benefits	$	7	$	10,030	$	62
Equipment and net occupancy		44		2,975		49
Printing, postage and supplies		74		3,677		367
Other costs of operations		646		72,475		3,069

	$	771	$	89,157	$	3,547

Investment securities

12 Months Ended

Dec. 31, 2010

Investment securities [Abstract]

Investment securities


3.	Investment securities

The amortized cost and estimated fair value of investment securities were as follows:


			Gross		Gross
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
			(In thousands)

December 31, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	61,772	$	1,680	$	18	$	63,434
Obligations of states and political subdivisions		59,921		561		57		60,425
Mortgage-backed securities:
Government issued or guaranteed		3,146,054		161,298		1,111		3,306,241
Privately issued residential		1,677,064		10,578		252,081		1,435,561
Privately issued commercial		25,357		—		2,950		22,407
Collateralized debt obligations		95,080		24,754		9,078		110,756
Other debt securities		310,017		26,883		38,000		298,900
Equity securities		119,112		5,098		8,442		115,768

		5,494,377		230,852		311,737		5,413,492

Investment securities held to maturity:
Obligations of states and political subdivisions		191,119		1,944		694		192,369
Mortgage-backed securities:
Government issued or guaranteed		808,108		14,061		—		822,169
Privately issued		312,537		—		114,397		198,140
Other debt securities		12,575		—		—		12,575

		1,324,339		16,005		115,091		1,225,253

Other securities		412,709		—		—		412,709

Total	$	7,231,425	$	246,857	$	426,828	$	7,051,454

December 31, 2009
Investment securities available for sale:
U.S. Treasury and federal agencies	$	102,755	$	1,988	$	57	$	104,686
Obligations of states and political subdivisions		61,468		1,583		128		62,923
Mortgage-backed securities:
Government issued or guaranteed		3,777,642		131,407		6,767		3,902,282
Privately issued residential		2,438,353		9,630		383,079		2,064,904
Privately issued commercial		33,133		—		7,967		25,166
Collateralized debt obligations		103,159		23,389		11,202		115,346
Other debt securities		309,514		16,851		58,164		268,201
Equity securities		170,985		5,590		15,705		160,870

		6,997,009		190,438		483,069		6,704,378

Investment securities held to maturity:
Obligations of states and political subdivisions		203,825		1,419		1,550		203,694
Privately issued mortgage-backed securities		352,195		—		150,993		201,202
Other debt securities		11,587		—		—		11,587

		567,607		1,419		152,543		416,483

Other securities		508,624		—		—		508,624

Total	$	8,073,240	$	191,857	$	635,612	$	7,629,485

No investment in securities of a single non-U.S. Government or government agency issuer exceeded ten percent of shareholders’ equity at December 31, 2010.

As of December 31, 2010, the latest available investment ratings of all obligations of states and political subdivisions, privately issued mortgage-backed securities, collateralized debt obligations and other debt securities were:


	Amortized		Estimated		Average Credit Rating of Fair Value Amount
	Cost		Fair Value		A or Better		BBB		BB		B or Less		Not Rated
	(In thousands)

Obligations of states and political subdivisions	$	251,040	$	252,794	$	172,088	$	39,222	$	200	$	—	$	41,284
Mortgage-backed securities:
Privately issued residential		1,989,601		1,633,701		736,043		138,522		37,699		721,437		—
Privately issued commercial		25,357		22,407		22,407		—		—		—		—
Collateralized debt obligations		95,080		110,756		6,474		12,268		14,917		77,097		—
Other debt securities		322,592		311,475		21,020		113,188		113,127		49,910		14,230

Total	$	2,683,670	$	2,331,133	$	958,032	$	303,200	$	165,943	$	848,444	$	55,514

The amortized cost and estimated fair value of collateralized mortgage obligations included in mortgage-backed securities were as follows:


	December 31
	2010		2009
	(In thousands)

Collateralized mortgage obligations:
Amortized cost	$	2,195,422	$	3,108,673
Estimated fair value		1,840,046		2,584,067

Gross realized gains on investment securities were $3,549,000 in 2010, $1,629,000 in 2009 and $34,730,000 in 2008. Gross realized losses on investment securities were $779,000 in 2010, $464,000 in 2009 and $259,000 in 2008. Effective January 1, 2009, the Company adopted new GAAP related to the recognition and presentation of other-than-temporary impairments of investment securities. In accordance with GAAP, the Company recognized $68 million and $128 million of pre-tax other-than-temporary impairment losses related to privately issued mortgage-backed securities in 2010 and 2009, respectively. The impairment charges were recognized in light of deterioration of real estate values and a rise in delinquencies and charge-offs of underlying mortgage loans collateralizing those securities. Approximately $6 million and $10 million of the impairment charges recognized in 2010 and 2009, respectively, related to collateralized debt obligations backed largely by trust preferred securities issued by financial institutions. Also reflected in 2010’s impairment charges was a $12 million charge related to American Depositary Shares (“ADSs”) of Allied Irish Banks, p.l.c. (“AIB”) obtained in M&T’s 2003 acquisition of a former subsidiary of AIB. The other-than-temporary impairment losses recognized were net of $30 million and $126 million of unrealized losses classified in accumulated other comprehensive income related to those securities for the years ended December 31, 2010 and 2009, respectively. The other-than-temporary impairment losses represent management’s estimate of credit losses inherent in the securities considering projected cash flows using assumptions of delinquency rates, loss severities, and other estimates of future collateral performance. The effect of the adoption of the new accounting requirements on debt securities previously reported as other-than-temporarily impaired was not material and, therefore, the Company did not record a transition adjustment as of January 1, 2009. During 2008, the Company recognized $182 million of other-than-temporary impairment losses, mainly attributable to a $153 million impairment charge recognized on its preferred stock holdings of The Federal National Mortgage Association (“Fannie Mae”) and The Federal Home Loan Mortgage Corporation (“Freddie Mac”) with a cost basis of $162 million following the placement of those government-sponsored entities into conservatorship on September 7, 2008. Other-than-temporary charges of $18 million and $11 million were also recognized during 2008 on privately issued mortgage-backed securities and securities backed by trust preferred securities issued by financial institutions, respectively.

Changes in credit losses during 2010 and 2009 associated with debt securities for which other-than-temporary impairment losses have been previously recognized in earnings follows:


	Year Ended December 31
	2010			2009
	(In thousands)

Estimated credit losses — beginning balance	$	284,513		$	155,967
Additions for credit losses not previously recognized		74,288			138,297
Reductions for increases in cash flows		(754	)		(1,393	)
Reductions for realized losses		(30,135	)		(8,358	)

Estimated credit losses — ending balance	$	327,912		$	284,513

At December 31, 2010, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:


	Amortized		Estimated
	Cost		Fair Value
	(In thousands)

Debt securities available for sale:
Due in one year or less	$	40,263	$	40,367
Due after one year through five years		55,144		57,226
Due after five years through ten years		22,421		24,658
Due after ten years		408,962		411,264

		526,790		533,515
Mortgage-backed securities available for sale		4,848,475		4,764,209

	$	5,375,265	$	5,297,724

Debt securities held to maturity:
Due in one year or less	$	28,161	$	28,353
Due after one year through five years		10,628		10,971
Due after five years through ten years		138,361		139,162
Due after ten years		26,544		26,458

		203,694		204,944
Mortgage-backed securities held to maturity		1,120,645		1,020,309

	$	1,324,339	$	1,225,253

A summary of investment securities that as of December 31, 2010 and 2009 had been in a continuous unrealized loss position for less than twelve months and those that had been in a continuous unrealized loss position for twelve months or longer follows:


	Less Than 12 Months					12 Months or More
			Unrealized					Unrealized
	Fair Value		Losses			Fair Value		Losses
			(In thousands)

December 31, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	27,289	$	(18	)	$	—	$	—
Obligations of states and political subdivisions		3,712		(18	)		2,062		(39	)
Mortgage-backed securities:
Government issued or guaranteed		68,507		(1,079	)		2,965		(32	)
Privately issued residential		61,192		(1,054	)		1,057,315		(251,027	)
Privately issued commercial		—		—			22,407		(2,950	)
Collateralized debt obligations		12,462		(6,959	)		6,004		(2,119	)
Other debt securities		2,134		(10	)		88,969		(37,990	)
Equity securities		5,326		(3,721	)		673		(4,721	)

		180,622		(12,859	)		1,180,395		(298,878	)

Investment securities held to maturity:
Obligations of states and political subdivisions		76,318		(638	)		467		(56	)
Privately issued mortgage-backed securities		—		—			198,140		(114,397	)

		76,318		(638	)		198,607		(114,453	)

Total	$	256,940	$	(13,497	)	$	1,379,002	$	(413,331	)

December 31, 2009
Investment securities available for sale:
U.S. Treasury and federal agencies	$	6,265	$	(53	)	$	572	$	(4	)
Obligations of states and political subdivisions		9,540		(83	)		3,578		(45	)
Mortgage-backed securities:
Government issued or guaranteed		685,319		(6,460	)		19,379		(307	)
Privately issued residential		98,312		(2,871	)		1,504,020		(380,208	)
Privately issued commercial		—		—			25,166		(7,967	)
Collateralized debt obligations		13,046		(10,218	)		3,598		(984	)
Other debt securities		5,786		(174	)		138,705		(57,990	)
Equity securities		7,449		(1,728	)		23,159		(13,977	)

		825,717		(21,587	)		1,718,177		(461,482	)

Investment securities held to maturity:
Obligations of states and political subdivisions		136,032		(1,492	)		626		(58	)
Privately issued mortgage-backed securities		—		—			201,202		(150,993	)

		136,032		(1,492	)		201,828		(151,051	)

Total	$	961,749	$	(23,079	)	$	1,920,005	$	(612,533	)

The Company owned 542 individual investment securities with aggregate gross unrealized losses of $427 million at December 31, 2010. Approximately $366 million of the unrealized losses pertain to privately issued mortgage-backed securities with a cost basis of $1.7 billion. The Company also had $47 million of unrealized losses on trust preferred securities issued by financial institutions, securities backed by trust preferred securities issued by financial institutions and other entities, and other debt securities having a cost basis of $157 million. Based on a review of each of the remaining securities in the investment securities portfolio at December 31, 2010, with the exception of the aforementioned securities for which other-than-temporary impairment losses were recognized, the Company concluded that it expected to recover the amortized cost basis of its investment. As of December 31, 2010, the Company does not intend to sell nor is it anticipated that it would be required to sell any of its impaired investment securities. At December 31, 2010, the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $413 million of cost method investment securities.

At December 31, 2010, investment securities with a carrying value of $4,762,579,000, including $3,500,392,000 of investment securities available for sale, were pledged to secure demand notes issued to the U.S. Treasury, borrowings from various FHLBs, repurchase agreements, governmental deposits, interest rate swap agreements and available lines of credit as described in note 9.

Investment securities pledged by the Company to secure obligations whereby the secured party is permitted by contract or custom to sell or repledge such collateral totaled $1,937,817,000 at December 31, 2010. The pledged securities included securities of the U.S. Treasury and federal agencies and mortgage-backed securities.

Loans and leases

12 Months Ended

Dec. 31, 2010

Loans and leases [Abstract]

Loans and leases


4.	Loans and leases

Total loans and leases outstanding were comprised of the following:


	December 31
	2010			2009
	(In thousands)

Loans
Commercial, financial, etc.	$	11,999,065		$	11,913,437
Real estate:
Residential		5,876,413			5,401,932
Commercial		16,977,747			16,345,601
Construction		4,332,618			4,726,570
Consumer		11,483,564			12,041,617

Total loans		50,669,407			50,429,157
Leases
Commercial		1,646,535			1,877,300

Total loans and leases		52,315,942			52,306,457
Less: unearned discount		(325,560	)		(369,771	)

Total loans and leases, net of unearned discount	$	51,990,382		$	51,936,686

One-to-four family residential mortgage loans held for sale were $341 million at December 31, 2010 and $530 million at December 31, 2009. Commercial mortgage loans held for sale were $204 million at December 31, 2010 and $123 million at December 31, 2009.

As of December 31, 2010, approximately $13 million of one-to-four family residential mortgage loans serviced for others had been sold with credit recourse. As of December 31, 2010, approximately $1.6 billion of commercial mortgage loan balances serviced for others had been sold with recourse in conjunction with the Company’s participation in the Fannie Mae Delegated Underwriting and Servicing (“DUS”) program. At December 31, 2010, the Company estimated that the recourse obligations described above were not material to the Company’s consolidated financial position. There have been no material losses incurred as a result of those credit recourse arrangements.

In addition to recourse obligations, as described in note 21, the Company is contractually obligated to repurchase previously sold residential real estate loans that do not ultimately meet investor sale criteria related to underwriting procedures or loan documentation. When required to do so, the Company may reimburse loan purchasers for losses incurred or may repurchase certain loans. Charges incurred for such obligation, which are recorded as a reduction of mortgage banking revenues, were $30 million, $10 million and $4 million in 2010, 2009 and 2008, respectively.

A summary of current, past due and nonaccrual loans as of December 31, 2010 was as follows:


					90 Days or More
			30-89 Days		Past Due and		Purchased
	Current		Past Due		Accruing		Impaired		Nonaccrual		Total
	(In thousands)

Commercial, financial, leasing, etc	$	13,088,887	$	96,087	$	16,647	$	2,250	$	186,739	$	13,390,610
Real estate:
Commercial		16,589,240		89,906		35,338		8,275		209,031		16,931,790
Residential builder and developer		891,764		30,805		9,763		72,710		346,448		1,351,490
Other commercial construction		2,723,399		36,420		11,323		2,098		126,641		2,899,881
Residential		4,699,711		229,641		192,276		9,320		172,729		5,303,677
Residential Alt-A		475,236		42,674		—		—		106,469		624,379
Consumer:
Home equity lines and loans		6,472,563		38,367		—		2,366		43,055		6,556,351
Automobile		2,608,230		44,604		—		—		31,892		2,684,726
Other		2,190,353		36,689		4,246		—		16,190		2,247,478

Total	$	49,739,383	$	645,193	$	269,593	$	97,019	$	1,239,194	$	51,990,382

Nonaccrual loans totaled $1,331,702,000 at December 31, 2009. Renegotiated loans (loans which had been renegotiated at below-market interest rates or for which other concessions were granted, but are accruing interest) were $233,342,000 and $212,548,000 at December 31, 2010 and 2009, respectively. To assist borrowers the Company modified the terms of select loans secured by residential real estate, largely from the Company’s portfolio of Alt-A loans. At December 31, 2010, outstanding balances of those modified loans totaled approximately $308 million. Of that total, $117 million were included in nonaccrual loans at December 31, 2010. The remaining $191 million of such modified loans have demonstrated payment capability consistent with the modified terms and accordingly, were classified as renegotiated loans and were accruing interest at the 2010 year-end. If nonaccrual and renegotiated loans had been accruing interest at their originally contracted terms, interest income on such loans would have amounted to $90,351,000 in 2010 and $99,618,000 in 2009. The actual amounts included in interest income during 2010 and 2009 on such loans were $40,139,000 and $43,920,000, respectively.

Borrowings by directors and certain officers of M&T and its banking subsidiaries, and by associates of such persons, exclusive of loans aggregating less than $120,000 amounted to $105,540,000 and $106,845,000 at December 31, 2010 and 2009, respectively. During 2010, new borrowings by such persons amounted to $2,711,000 (including any borrowings of new directors or officers that were outstanding at the time of their election) and repayments and other reductions (including reductions resulting from retirements) were $4,016,000.

At December 31, 2010, approximately $6.0 billion of commercial loans and leases, $6.7 billion of commercial mortgage loans, $3.0 billion of one-to-four family residential mortgage loans, $4.4 billion of home equity loans and lines of credit and $3.2 billion of other consumer loans were pledged to secure outstanding borrowings from the FHLB of New York and available lines of credit as described in note 9.

The Company’s loan and lease portfolio includes commercial lease financing receivables consisting of direct financing and leveraged leases for machinery and equipment, railroad equipment, commercial trucks and trailers, and aircraft. A summary of lease financing receivables follows:


	December 31
	2010			2009
	(In thousands)

Commercial leases:
Direct financings:
Lease payments receivable	$	1,205,499		$	1,406,238
Estimated residual value of leased assets		96,441			99,968
Unearned income		(181,771	)		(224,768	)

Investment in direct financings		1,120,169			1,281,438
Leveraged leases:
Lease payments receivable		164,818			185,679
Estimated residual value of leased assets		179,777			185,415
Unearned income		(63,154	)		(74,131	)

Investment in leveraged leases		281,441			296,963

Total investment in leases	$	1,401,610		$	1,578,401

Deferred taxes payable arising from leveraged leases	$	202,566		$	212,910

Included within the estimated residual value of leased assets at December 31, 2010 and 2009 were $53 million and $56 million, respectively, in residual value associated with direct financing leases that are guaranteed by the lessees. The Company is indemnified from loss by AIB on a portion of leveraged leases obtained in the acquisition of a former subsidiary of AIB on April 1, 2003. Amounts in the leveraged lease section of the table subject to such indemnification included lease payments receivable of $5 million and $7 million as of December 31, 2010 and 2009, respectively, estimated residual value of leased assets of $26 million and $31 million as of December 31, 2010 and 2009, respectively, and unearned income of $4 million and $6 million as of December 31, 2010 and 2009, respectively.

At December 31, 2010, the minimum future lease payments to be received from lease financings were as follows:


	Total
	(In thousands)

Year ending December 31:
2011	$	316,545
2012		287,561
2013		186,582
2014		126,186
2015		86,833
Later years		366,610

	$	1,370,317

Allowance For Credit Losses

12 Months Ended

Dec. 31, 2010

Allowance for Credit Losses [Abstract]

Allowance for credit losses


5.	Allowance for credit losses

Changes in the allowance for credit losses for the year ended December 31, 2010 were as follows:


	Commercial,
	Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(In thousands)

Beginning balance	$	219,170		$	359,770		$	91,582		$	137,124		$	70,376	$	878,022
Provision for credit losses		58,438			159,023			52,960			97,573			6		368,000
Consolidation of loan securitization trusts		—			—			2,752			—			—		2,752
Net charge-offs
Charge-offs		(91,650	)		(124,087	)		(71,016	)		(125,593	)		—		(412,346	)
Recoveries		26,621			5,856			10,073			23,963			—		66,513

Net charge-offs		(65,029	)		(118,231	)		(60,943	)		(101,630	)		—		(345,833	)

Ending balance	$	212,579		$	400,562		$	86,351		$	133,067		$	70,382	$	902,941

Despite the above allocation, the allowance for credit losses is general in nature and is available to absorb losses from any loan or lease type. Changes in the allowance for credit losses for 2009 and 2008 were as follows:


	Year Ended December 31
	2009			2008
	(In thousands)

Beginning balance	$	787,904		$	759,439
Provision for credit losses		604,000			412,000
Allowance related to loans sold or securitized		—			(525	)
Net charge-offs
Charge-offs		(556,462	)		(420,655	)
Recoveries		42,580			37,645

Net charge-offs		(513,882	)		(383,010	)

Ending balance	$	878,022		$	787,904

In ascertaining the adequacy of the allowance for credit losses, the Company estimates losses attributable to specific troubled credits identified through both normal and detailed or intensified credit review processes and also estimates losses inherent in other loans and leases on a collective basis. For purposes of determining the level of the allowance for credit losses, the Company evaluates its loan and lease portfolio by loan type. The amounts of loss components in the Company’s loan and lease portfolios are determined through a loan by loan analysis of larger balance commercial and commercial real estate loans that are in nonaccrual status and by applying loss factors to groups of loan balances based on loan type and management’s classification of such loans under the Company’s loan grading system. Measurement of the specific loss components is typically based on expected future cash flows, collateral values and other factors that may impact the borrower’s ability to pay. In determining the allowance for credit losses the Company utilizes an extensive loan grading system which is applied to all commercial and commercial real estate credits. Loan officers are responsible for continually assigning grades to loans based on standards outlined in the Company’s Credit Policy. Internal loan grades are also extensively monitored by the Company’s loan review department to ensure consistency and strict adherence to the prescribed standards. Loan grades are assigned loss component factors that reflect the Company’s loss estimate for each group of loans and leases. Factors considered in assigning loan grades and loss component factors include borrower-specific information related to expected future cash flows and operating results, collateral values, financial condition, payment status, and other information; levels of and trends in portfolio charge-offs and recoveries; levels of and trends in portfolio delinquencies and impaired loans; changes in the risk profile of specific portfolios; trends in volume and terms of loans; effects of changes in credit concentrations; and observed trends and practices in the banking industry. Modified loans, including smaller balance homogenous loans, that are considered to be troubled debt restructurings are evaluated for impairment giving consideration to the impact of the modified loan terms on the present value of the loan’s expected cash flows. The following table provides information with respect to impaired loans and leases as of and for the year ended December 31, 2010.


	December 31, 2010						Year Ended December 31, 2010
			Unpaid				Average
	Recorded		Principal		Related		Recorded		Interest Income Recognized
	Investment		Balance		Allowance		Investment		Total		Cash Basis
	(In thousands)

With an allowance recorded:
Commercial, financial, leasing, etc.	$	121,744	$	170,888	$	40,909
Real estate:
Commercial		110,975		140,015		17,393
Residential builder and developer		263,545		295,031		78,597
Other commercial construction		80,934		85,432		22,067
Residential		73,006		85,279		3,375
Residential Alt-A		180,665		191,445		36,000
Consumer:
Home equity lines and loans		11,799		13,378		2,227
Automobile		58,858		58,858		12,597
Other		2,978		2,978		768

		904,504		1,043,304		213,933

With no related allowance recorded:
Commercial, financial, leasing, etc.		65,827		86,332		—
Real estate:
Commercial		101,939		116,316		—
Residential builder and developer		100,799		124,383		—
Other commercial construction		46,656		50,496		—
Residential		5,035		7,723		—
Residential Alt-A		28,967		47,879		—

		349,223		433,129		—

Total:
Commercial, financial, leasing, etc.		187,571		257,220		40,909	$	266,685	$	5,027	$	5,003
Real estate:
Commercial		212,914		256,331		17,393		233,429		1,990		1,748
Residential builder and developer		364,344		419,414		78,597		322,249		1,723		753
Other commercial construction		127,590		135,928		22,067		64,436		462		449
Residential		78,041		93,002		3,375		62,104		3,079		1,793
Residential Alt-A		209,632		239,324		36,000		220,589		8,397		1,758
Consumer:
Home equity lines and loans		11,799		13,378		2,227		11,807		790		202
Automobile		58,858		58,858		12,597		54,221		3,684		1,233
Other		2,978		2,978		768		3,165		243		48

Total	$	1,253,727	$	1,476,433	$	213,933	$	1,238,685	$	25,395	$	12,987

The recorded investment in loans considered impaired for purposes of applying GAAP was $1,311,616,000 at December 31, 2009. The recorded investment in loans considered impaired for which there was a related valuation allowance for impairment included in the allowance for credit losses and the amount of such impairment allowance were $1,077,626,000 and $244,137,000, respectively, at December 31, 2009. The recorded investment in loans considered impaired for which there was no related valuation allowance for impairment was $233,990,000 at December 31, 2009. The average recorded investment in impaired loans during 2009 and 2008 was $986,164,000 and $371,298,000, respectively. Interest income recognized on impaired loans totaled $10,224,000 and $7,222,000 for the years ended December 31, 2009 and 2008, respectively.

The following table summarizes the loan grades applied to the Company’s commercial and commercial real estate loans as of December 31, 2010.


			Real Estate
	Commercial,				Residential		Other
	Financial,				Builder and		Commercial
	Leasing, etc		Commercial		Developer		Construction
	(In thousands)

Pass	$	12,371,138	$	15,831,104	$	693,110	$	2,253,589
Criticized accrual		832,733		891,655		311,932		519,651
Criticized nonaccrual		186,739		209,031		346,448		126,641

Total	$	13,390,610	$	16,931,790	$	1,351,490	$	2,899,881

In assessing the adequacy of the allowance for credit losses, residential real estate loans and consumer loans are generally evaluated collectively after considering such factors as payment performance (see note 4), collateral values and trends related thereto. However, residential real estate loans and outstanding balances of home equity loans and lines of credit that are more than 150 days past due are generally evaluated for collectibility on a loan-by-loan basis giving consideration to estimated collateral values.

The Company also measures additional losses for purchased impaired loans when it is probable that the Company will be unable to collect all cash flows expected at acquisition plus additional cash flows expected to be collected arising from changes in estimates after acquisition. In addition, the Company also provides an inherent unallocated portion of the allowance that is intended to recognize probable losses that are not otherwise identifiable and includes management’s subjective determination of amounts necessary to provide for the possible use of imprecise estimates in determining the allocated portion of the allowance.

At December 31, 2010 the allocation of the allowance for credit losses summarized on the basis of the Company’s impairment methodology was as follows:


	Commercial,
	Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(In thousands)

Individually evaluated for impairment	$	40,459	$	114,082	$	39,000	$	15,492	$	209,033
Collectively evaluated for impairment		171,670		282,505		46,976		117,475		618,626
Purchased impaired		450		3,975		375		100		4,900

Allocated	$	212,579	$	400,562	$	86,351	$	133,067	$	832,559

Unallocated										70,382

Total									$	902,941

The recorded investment in loans and leases summarized on the basis of the Company’s impairment methodology as of December 31, 2010 was as follows:


	Commercial,
	Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(In thousands)

Individually evaluated for impairment	$	186,739	$	682,120	$	286,612	$	72,082	$	1,227,553
Collectively evaluated for impairment		13,201,621		20,417,958		5,632,124		11,414,107		50,665,810
Purchased impaired		2,250		83,083		9,320		2,366		97,019

Total	$	13,390,610	$	21,183,161	$	5,928,056	$	11,488,555	$	51,990,382

Premises and equipment

12 Months Ended

Dec. 31, 2010

Premises and equipment [Abstract]

Premises and equipment


6.	Premises and equipment

The detail of premises and equipment was as follows:


	December 31
	2010		2009
	(In thousands)

Land	$	64,728	$	63,961
Buildings — owned		280,288		271,181
Buildings — capital leases		1,131		1,131
Leasehold improvements		172,638		165,110
Furniture and equipment — owned		366,227		345,421
Furniture and equipment — capital leases		1,387		—

		886,399		846,804
Less: accumulated depreciation and amortization
Owned assets		449,571		410,218
Capital leases		991		741

		450,562		410,959

Premises and equipment, net	$	435,837	$	435,845

Net lease expense for all operating leases totaled $94,646,000 in 2010, $89,030,000 in 2009 and $73,886,000 in 2008. Minimum lease payments under noncancelable operating leases are presented in note 21. Minimum lease payments required under capital leases are not material.

Capitalized Servicing Assets

12 Months Ended

Dec. 31, 2010

Capitalized Servicing Assets [Abstract]

Capitalized Servicing Assets


7.	Capitalized servicing assets

Changes in capitalized servicing assets were as follows:


										Small-Balance
	Residential Mortgage Loans									Commercial Mortgage Loans
For Year Ended December 31,	2010			2009			2008			2010			2009			2008
	(In thousands)

Beginning balance	$	101,155		$	106,979		$	118,763		$	40,251		$	58,044		$	56,956
Originations		27,430			31,034			17,765			—			—			—
Purchases		593			972			3,322			—			—			20,974
Assumed in loan securitizations (note 19)		—			788			8,455			—			—			—
Consolidation of loan securitization trusts (note 19)		(1,843	)		—			—			—			—			—
Amortization		(35,269	)		(38,618	)		(41,326	)		(14,054	)		(17,793	)		(19,886	)

		92,066			101,155			106,979			26,197			40,251			58,044
Valuation allowance		—			(50	)		(22,000	)		—			—			—

Ending balance, net	$	92,066		$	101,105		$	84,979		$	26,197		$	40,251		$	58,044


	Commercial Mortgage Loans									Total
For Year Ended December 31,	2010			2009			2008			2010			2009			2008
	(In thousands)

Beginning balance	$	32,896		$	26,336		$	20,240		$	174,302		$	191,359		$	195,959
Originations		16,976			12,417			10,606			44,406			43,451			28,371
Purchases		—			—			—			593			972			24,296
Assumed in loan securitizations (note 19)		—			—			—			—			788			8,455
Consolidation of loan securitization trusts (note 19)		—			—			—			(1,843	)		—			—
Amortization		(7,259	)		(5,857	)		(4,510	)		(56,582	)		(62,268	)		(65,722	)

		42,613			32,896			26,336			160,876			174,302			191,359
Valuation allowance		—			—			—			—			(50	)		(22,000	)

Ending balance, net	$	42,613		$	32,896		$	26,336		$	160,876		$	174,252		$	169,359

Residential mortgage loans serviced for others were $15.9 billion at each of December 31, 2010 and December 31, 2009 and $15.4 billion at December 31, 2008. Small-balance commercial mortgage loans serviced for others were $5.2 billion, $5.5 billion and $5.9 billion at December 31, 2010, 2009 and 2008, respectively. Commercial mortgage loans serviced for others were $8.1 billion, $7.1 billion and $6.4 billion at December 31, 2010, 2009 and 2008, respectively.

During 2010 and 2009, $50,000 and $21,950,000, respectively, of the valuation allowance for capitalized residential mortgage loan servicing assets was reversed because of increases in the market value of certain strata of servicing assets relative to the amortized cost basis of the servicing assets in such strata. During 2008, a provision for impairment of $16,000,000 was added to the valuation allowance for capitalized residential mortgage loan servicing assets because the carrying value of certain strata of capitalized servicing assets exceeded estimated fair value. The estimated fair value of capitalized residential mortgage loan servicing assets was approximately $162 million at December 31, 2010 and $158 million at December 31, 2009. The fair value of capitalized residential mortgage loan servicing assets was estimated using weighted-average discount rates of 13.2% and 13.3% at December 31, 2010 and 2009, respectively, and contemporaneous prepayment assumptions that vary by loan type. At December 31, 2010 and 2009, the discount rate represented a weighted-average option-adjusted spread (“OAS”) of 748 basis points (hundredths of one percent) and 775 basis points, respectively, over market implied forward London Interbank Offered Rates. The estimated fair value of capitalized small-balance commercial mortgage loan servicing assets was approximately $58 million at December 31, 2010 and $64 million at December 31, 2009. The fair value of capitalized small-balance commercial loan servicing assets was estimated using weighted-average discount rates of 19.7% and 20.3% at December 31, 2010 and 2009, respectively, and contemporaneous prepayment assumptions that vary by loan type. At December 31, 2010 and 2009, the discount rate represented a weighted-average OAS of 1,778 basis points and 1,779 basis points, respectively, over market implied forward London Interbank Offered Rates. The estimated fair value of capitalized residential and small-balance commercial mortgage loan servicing rights may vary significantly in subsequent periods due to changing interest rates and the effect thereof on prepayment speeds. The estimated fair value of capitalized commercial mortgage loan servicing assets was approximately $50 million and $39 million at December 31, 2010 and 2009, respectively. An 18% discount rate was used to estimate the fair value of capitalized commercial mortgage loan servicing rights at December 31, 2010 and 2009 with no prepayment assumptions because, in general, the servicing agreements allow the Company to share in customer loan prepayment fees and thereby recover the remaining carrying value of the capitalized servicing rights associated with such loan. The Company’s ability to realize the carrying value of capitalized commercial mortgage servicing rights is more dependent on the borrowers’ abilities to repay the underlying loans than on prepayments or changes in interest rates.

The key economic assumptions used to determine the fair value of capitalized servicing rights at December 31, 2010 and the sensitivity of such value to changes in those assumptions are summarized in the table that follows. Those calculated sensitivities are hypothetical and actual changes in the fair value of capitalized servicing rights may differ significantly from the amounts presented herein. The effect of a variation in a particular assumption on the fair value of the servicing rights is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another which may magnify or counteract the sensitivities. The changes in assumptions are presumed to be instantaneous.


				Small-Balance
	Residential			Commercial			Commercial

Weighted-average prepayment speeds		13.60	%		7.98	%
Impact on fair value of 10% adverse change	$	(8,017,000	)	$	(2,358,000	)
Impact on fair value of 20% adverse change		(15,254,000	)		(4,521,000	)
Weighted-average OAS		7.48	%		17.78	%
Impact on fair value of 10% adverse change	$	(1,188,000	)	$	(1,913,000	)
Impact on fair value of 20% adverse change		(4,047,000	)		(3,742,000	)
Weighted-average discount rate								18.00	%
Impact on fair value of 10% adverse change							$	(2,245,000	)
Impact on fair value of 20% adverse change								(4,324,000	)

Goodwill and other intangible assets

12 Months Ended

Dec. 31, 2010

Goodwill and other intangible assets [Abstract]

Goodwill and other intangible assets


8.	Goodwill and other intangible assets

In accordance with GAAP, the Company does not amortize goodwill, however, core deposit and other intangible assets are amortized over the estimated life of each respective asset. Total amortizing intangible assets were comprised of the following:


	Gross Carrying		Accumulated		Net Carrying
	Amount		Amortization		Amount
	(In thousands)

December 31, 2010
Core deposit	$	701,000	$	576,986	$	124,014
Other		119,968		118,065		1,903

Total	$	820,968	$	695,051	$	125,917

December 31, 2009
Core deposit	$	701,000	$	524,358	$	176,642
Other		118,366		112,590		5,776

Total	$	819,366	$	636,948	$	182,418

Amortization of core deposit and other intangible assets was generally computed using accelerated methods over original amortization periods of five to ten years. The weighted-average original amortization period was approximately eight years. The remaining weighted-average amortization period as of December 31, 2010 was approximately five years. Amortization expense for core deposit and other intangible assets was $58,103,000, $64,255,000 and $66,646,000 for the years ended December 31, 2010, 2009 and 2008, respectively. Estimated amortization expense in future years for such intangible assets is as follows:


	(In thousands)

Year ending December 31:
2011	$	42,139
2012		32,668
2013		24,072
2014		16,109
2015		8,346
Later years		2,583

	$	125,917

In accordance with GAAP, the Company completed annual goodwill impairment tests as of October 1, 2010, 2009 and 2008. For purposes of testing for impairment, the Company assigned all recorded goodwill to the reporting units originally intended to benefit from past business combinations, which has historically been the Company’s core relationship business reporting units. Goodwill was generally assigned based on the implied fair value of the acquired goodwill applicable to the benefited reporting units at the time of each respective acquisition. The implied fair value of the goodwill was determined as the difference between the estimated incremental overall fair value of the reporting unit and the estimated fair value of the net assets assigned to the reporting unit as of each respective acquisition date. To test for goodwill impairment at each evaluation date, the Company compared the estimated fair value of each of its reporting units to their respective carrying amounts and certain other assets and liabilities assigned to the reporting unit, including goodwill and core deposit and other intangible assets. The methodologies used to estimate fair values of reporting units as of the acquisition dates and as of the evaluation dates were similar. For the Company’s core customer relationship business reporting units, fair value was estimated as the present value of the expected future cash flows of the reporting unit. Based on the results of the goodwill impairment tests, the Company concluded that the amount of recorded goodwill was not impaired at the respective testing dates.

A summary of goodwill assigned to each of the Company’s reportable segments as of December 31, 2010 and 2009 for purposes of testing for impairment is as follows.


	(In thousands)

Business Banking	$	748,907
Commercial Banking		907,524
Commercial Real Estate		349,197
Discretionary Portfolio		—
Residential Mortgage Banking		—
Retail Banking		1,144,404
All Other		374,593

Total	$	3,524,625

Borrowings

12 Months Ended

Dec. 31, 2010

Borrowings [Abstract]

Borrowings


9.	Borrowings

The amounts and interest rates of short-term borrowings were as follows:


	Federal Funds
	Purchased
	and			Other
	Repurchase			Short-term
	Agreements			Borrowings			Total
	(Dollars in thousands)

At December 31, 2010
Amount outstanding	$	866,555		$	80,877		$	947,432
Weighted-average interest rate		0.19	%		0.20	%		0.19	%
For the year ended December 31, 2010
Highest amount at a month-end	$	2,612,727		$	236,842
Daily-average amount outstanding		1,749,525			104,508		$	1,854,033
Weighted-average interest rate		0.15	%		0.33	%		0.16	%
At December 31, 2009
Amount outstanding	$	2,211,692		$	230,890		$	2,442,582
Weighted-average interest rate		0.04	%		0.66	%		0.10	%
For the year ended December 31, 2009
Highest amount at a month-end	$	2,491,573		$	2,049,727
Daily-average amount outstanding		1,885,464			1,025,601		$	2,911,065
Weighted-average interest rate		0.15	%		0.42	%		0.24	%
At December 31, 2008
Amount outstanding	$	970,529		$	2,039,206		$	3,009,735
Weighted-average interest rate		0.10	%		0.36	%		0.27	%
For the year ended December 31, 2008
Highest amount at a month-end	$	5,291,846		$	2,039,206
Daily-average amount outstanding		4,652,388			1,433,734		$	6,086,122
Weighted-average interest rate		2.15	%		2.97	%		2.34	%

Short-term borrowings have a stated maturity of one year or less at the date the Company entered into the obligation. In general, federal funds purchased and short-term repurchase agreements outstanding at December 31, 2010 matured on the next business day following year-end. Other short-term borrowings included $28 million and $152 million at December 31, 2010 and 2009, respectively, of borrowings from the FHLB of Atlanta. The remaining short-term borrowings were from the U.S. Treasury and others.

At December 31, 2010, the Company had lines of credit under formal agreements as follows:


					M&T
	M&T		M&T Bank		Bank, N.A.
	(In thousands)

Outstanding borrowings	$	—	$	2,897,133	$	—
Unused		30,000		12,914,549		98,158

M&T has a revolving credit agreement with an unaffiliated commercial bank whereby M&T may borrow up to $30 million at its discretion through December 2, 2011. At December 31, 2010, M&T Bank had borrowing facilities available with the FHLBs whereby M&T Bank could borrow up to approximately $6.0 billion. Additionally, M&T Bank and M&T Bank, National Association (“M&T Bank, N.A.”), a wholly owned subsidiary of M&T, had available lines of credit with the Federal Reserve Bank of New York totaling approximately $9.9 billion at December 31, 2010. M&T Bank and M&T Bank, N.A. are required to pledge loans and investment securities as collateral for these borrowing facilities.

Long-term borrowings were as follows:


	December 31,
	2010		2009
	(In thousands)

Senior notes of M&T — 5.375% due 2012	$	299,971	$	299,950
Advances from FHLB:
Variable rates		2,525,268		4,405,925
Fixed rates		347,161		818,562
Agreements to repurchase securities		1,625,001		1,625,001
Subordinated notes of M&T Bank:
8% due 2010		—		140,854
3.85% due 2013, variable rate commenced in 2008		400,000		400,000
6.625% due 2017		425,969		404,428
9.5% due 2018		50,000		50,000
5.585% due 2020, variable rate commencing 2015		372,668		366,883
5.629% due 2021, variable rate commencing 2016		568,196		545,194
Junior subordinated debentures associated with preferred capital securities:
Fixed rates:
M&T Capital Trust I — 8.234%, due 2027		154,640		154,640
M&T Capital Trust II — 8.277%, due 2027		103,093		103,093
M&T Capital Trust III — 9.25%, due 2027		67,084		67,409
BSB Capital Trust I — 8.125%, due 2028		15,519		15,496
Provident Trust I — 8.29%, due 2028		24,256		24,061
Southern Financial Statutory Trust I — 10.60%, due 2030		6,455		6,439
M&T Capital Trust IV — 8.50%, due 2068		350,010		350,010
Variable rates:
First Maryland Capital I — due 2027		143,025		142,487
First Maryland Capital II — due 2027		143,975		143,312
Allfirst Asset Trust — due 2029		95,623		95,477
BSB Capital Trust III — due 2033		15,464		15,464
Provident Trust III — due 2033		50,823		50,430
Southern Financial Capital Trust III — due 2033		7,566		7,513
Other		48,384		7,388

	$	7,840,151	$	10,240,016

Long-term variable rate advances from the FHLB had contractual interest rates that ranged from 0.24% to 2.00% at December 31, 2010 and from 0% to 3.53% at December 31, 2009. The weighted-average contractual interest rates were 0.32% at December 31, 2010 and 0.35% at December 31, 2009. Long-term fixed rate advances from the FHLB had contractual interest rates ranging from 3.48% to 7.32%. The weighted-average contractual interest rates payable were 4.33% at December 31, 2010 and 4.89% at December 31, 2009. Advances from the FHLB mature at various dates through 2035 and are secured by residential real estate loans, commercial real estate loans and investment securities.

Long-term agreements to repurchase securities had contractual interest rates that ranged from 3.69% to 5.14%. The weighted-average contractual interest rates were 4.16% at December 31, 2010 and 4.21% at December 31, 2009. The agreements outstanding at December 31, 2010 reflect various repurchase dates through 2017, however, the contractual maturities of the underlying investment securities extend beyond such repurchase dates.

The subordinated notes of M&T Bank are unsecured and are subordinate to the claims of depositors and other creditors of M&T Bank. The subordinated notes of M&T Bank due 2013 had a fixed rate of interest of 3.85% through March 2008 and bear a floating rate of interest thereafter until maturity in April 2013, at a rate equal to the three-month London Interbank Offered Rate (“LIBOR”) plus 1.50%. That variable rate was 1.79% at each of December 31, 2010 and 2009.

The fixed and floating rate junior subordinated deferrable interest debentures (“Junior Subordinated Debentures”) are held by various trusts and were issued in connection with the issuance by those trusts of preferred capital securities (“Capital Securities”) and common securities (“Common Securities”). The proceeds from the issuances of the Capital Securities and the Common Securities were used by the trusts to purchase the Junior Subordinated Debentures. The Common Securities of each of those trusts are wholly owned by M&T and are the only class of each trust’s securities possessing general voting powers. The Capital Securities represent preferred undivided interests in the assets of the corresponding trust. Under the Federal Reserve Board’s current risk-based capital guidelines, the Capital Securities are includable in M&T’s Tier 1 capital. However, the Dodd-Frank Wall Street Reform and Consumer Protection Act that was signed into law on July 21, 2010 provides for a three-year phase-in related to the exclusion of trust preferred capital securities from Tier 1 capital for large financial institutions, including M&T. That phase-in period begins on January 1, 2013. The variable rate Junior Subordinated Debentures pay interest quarterly at rates that are indexed to the three-month LIBOR. Those rates ranged from 1.14% to 3.64% at December 31, 2010 and from 1.13% to 3.63% at December 31, 2009. The weighted-average variable rates payable on those Junior Subordinated Debentures were 1.72% and 1.70% at December 31, 2010 and 2009, respectively.

Holders of the Capital Securities receive preferential cumulative cash distributions unless M&T exercises its right to extend the payment of interest on the Junior Subordinated Debentures as allowed by the terms of each such debenture, in which case payment of distributions on the respective Capital Securities will be deferred for comparable periods. During an extended interest period, M&T may not pay dividends or distributions on, or repurchase, redeem or acquire any shares of its capital stock. In the event of an extended interest period exceeding twenty quarterly periods for $350 million of Junior Subordinated Debentures due January 31, 2068, M&T must fund the payment of accrued and unpaid interest through an alternative payment mechanism, which requires M&T to issue common stock, non-cumulative perpetual preferred stock or warrants to purchase common stock until M&T has raised an amount of eligible proceeds at least equal to the aggregate amount of accrued and unpaid deferred interest on the Junior Subordinated Debentures due January 31, 2068. In general, the agreements governing the Capital Securities, in the aggregate, provide a full, irrevocable and unconditional guarantee by M&T of the payment of distributions on, the redemption of, and any liquidation distribution with respect to the Capital Securities. The obligations under such guarantee and the Capital Securities are subordinate and junior in right of payment to all senior indebtedness of M&T.

The Capital Securities will remain outstanding until the Junior Subordinated Debentures are repaid at maturity, are redeemed prior to maturity or are distributed in liquidation to the Trusts. The Capital Securities are mandatorily redeemable in whole, but not in part, upon repayment at the stated maturity dates (ranging from 2027 to 2068) of the Junior Subordinated Debentures or the earlier redemption of the Junior Subordinated Debentures in whole upon the occurrence of one or more events set forth in the indentures relating to the Capital Securities, and in whole or in part at any time after an optional redemption prior to contractual maturity contemporaneously with the optional redemption of the related Junior Subordinated Debentures in whole or in part, subject to possible regulatory approval. In connection with the issuance of 8.50% Enhanced Trust Preferred Securities associated with $350 million of Junior Subordinated Debentures maturing in 2068, M&T entered into a replacement capital covenant that provides that neither M&T nor any of its subsidiaries will repay, redeem or purchase any of the Junior Subordinated Debentures due January 31, 2068 or the 8.50% Enhanced Trust Preferred Securities prior to January 31, 2048, with certain limited exceptions, except to the extent that, during the 180 days prior to the date of that repayment, redemption or purchase, M&T and its subsidiaries have received proceeds from the sale of qualifying securities that (i) have equity-like characteristics that are the same as, or more equity-like than, the applicable characteristics of the 8.50% Enhanced Trust Preferred Securities or the Junior Subordinated Debentures due January 31, 2068, as applicable, at the time of repayment, redemption or purchase, and (ii) M&T has obtained the prior approval of the Federal Reserve Board, if required.

Long-term borrowings at December 31, 2010 mature as follows:


	(In thousands)

Year ending December 31:
2011	$	1,886,860
2012		1,560,616
2013		392,870
2014		7,570
2015		—
Later years		3,992,235

	$	7,840,151

Shareholders' Equity

12 Months Ended

Dec. 31, 2010

Shareholders' equity [Abstract]

Shareholders' equity


10.	Shareholders’ equity

M&T is authorized to issue 1,000,000 shares of preferred stock with a $1.00 par value per share. Preferred shares outstanding rank senior to common shares both as to dividends and liquidation preference, but have no general voting rights.

Issued and outstanding preferred stock of M&T is presented below:


	Shares		Carrying		Carrying
	Issued and		Value		Value
	Outstanding		December 31, 2010		December 31, 2009
	(Dollars in thousands)

Series A(a)
Fixed Rate Cumulative Perpetual Preferred Stock, Series A, $1,000 liquidation preference per share, 600,000 shares authorized		600,000	$	578,630	$	572,580
Series B(b)
Series B Mandatory Convertible Non-cumulative Preferred Stock, $1,000 liquidation preference per share, 26,500 shares authorized		26,500		26,500		26,500
Series C(a)(c)
Fixed Rate Cumulative Perpetual Preferred Stock, Series C, $1,000 liquidation preference per share, 151,500 shares authorized		151,500		135,527		131,155


(a)		Shares were issued as part of the Troubled Asset Relief Program — Capital Purchase Program of the U.S. Department of Treasury (“U.S. Treasury”). Cash proceeds were allocated between the preferred stock and a ten-year warrant to purchase M&T common stock (Series A — 1,218,522 common shares at $73.86 per share, Series C — 407,542 common shares at $55.76 per share). Dividends, if declared, will accrue and be paid quarterly at a rate of 5% per year for the first five years following the original 2008 issuance dates and thereafter at a rate of 9% per year. The agreement with the U.S. Treasury contains limitations on certain actions of M&T, including the payment of quarterly cash dividends on M&T’s common stock in excess of $.70 per share, the repurchase of its common stock during the first three years of the agreement, and the amount and nature of compensation arrangements for certain of the Company’s officers.


(b)		Shares were assumed in the Provident acquisition and a new Series B Preferred Stock was designated. In the aggregate, the shares of Series B Preferred Stock will automatically convert into 433,148 shares of M&T common stock on April 1, 2011, but shareholders may elect to convert their preferred shares at any time prior to that date. Dividends, if declared, are payable quarterly in arrears at a rate of 10% per year.

(c)		Shares were assumed in the Provident acquisition and a new Series C Preferred Stock was designated.

Stock-based compensation plans

12 Months Ended

Dec. 31, 2010

Stock-based compensation plans [Abstract]

Stock-based compensation plans


11.	Stock-based compensation plans

Stock-based compensation expense was $54 million in each of 2010 and 2009 and $50 million in 2008. The Company recognized income tax benefits related to stock-based compensation of $17 million in each of 2010 and 2009 and $11 million in 2008.

The Company’s equity incentive compensation plan allows for the issuance of various forms of stock-based compensation, including stock options, restricted stock, restricted stock units and performance-based awards. Through December 31, 2010, only stock-based compensation awards, including stock options, restricted stock and restricted stock units, that vest with the passage of time as service is provided have been issued. At December 31, 2010 and 2009, respectively, there were 5,959,828 and 6,134,264 shares available for future grant under the Company’s equity incentive compensation plan.

Restricted stock awards

Restricted stock awards are comprised of restricted stock and restricted stock units. Restricted stock awards generally vest over four years. Unrecognized compensation expense associated with restricted stock was $23 million as of December 31, 2010 and is expected to be recognized over a weighted-average period of 1.5 years. The Company generally will issue restricted shares from treasury stock to the extent available, but may also issue new shares. During 2010, 2009 and 2008, the number of restricted shares issued was 423,002, 709,415 and 37,747, respectively, with a weighted-average grant date fair value of $31,880,000, $27,932,000 and $3,446,000, respectively. Unrecognized compensation expense associated with restricted stock units was $7 million as of December 31, 2010 and is expected to be recognized over a weighted-average period of 1.2 years. During 2010 and 2009, the number of restricted stock units issued was 231,037 and 578,131, respectively, with a weighted-average grant date fair value of $17,039,000 and $22,663,000, respectively. There were no restricted stock units issued in 2008.

A summary of restricted stock and restricted stock unit activity follows:


	Restricted			Weighted-		Restricted			Weighted-
	Stock Units			Average		Stock			Average
	Outstanding			Grant Price		Outstanding			Grant Price

Unvested at January 1, 2010		566,449		$	39.21		733,687		$	42.52
Granted		231,037			73.75		423,002			75.37
Vested		(74,144	)		41.58		(165,799	)		65.33
Cancelled		(3,366	)		52.07		(25,818	)		49.74

Unvested at December 31, 2010		719,976		$	49.99		965,072		$	52.81

Stock option awards

Stock options issued generally vest over four years and are exercisable over terms not exceeding ten years and one day. The Company used an option pricing model to estimate the grant date present value of stock options granted. Stock options granted in 2010 and 2009 were not significant. For 2008 the weighted-average estimated grant date value per option was $15.85. The value was calculated using the following weighted-average assumptions: an option term of 6.5 years (representing the estimated period between grant date and exercise date based on historical data); a risk-free interest rate of 3.21% (representing the yield on a U.S. Treasury security with a remaining term equal to the expected option term); expected volatility of 21% (based on historical volatility of M&T’s common stock price); and an estimated dividend yield of 3.07% (representing the approximate annualized cash dividend rate paid with respect to a share of common stock at or near the grant date). Based on historical data and projected employee turnover rates, the Company reduced the estimated value of stock options for purposes of recognizing stock-based compensation expense by 7% to reflect the probability of forfeiture prior to vesting. Aggregate fair value of options expected to vest that were granted in 2008 were $46 million.

A summary of stock option activity follows:


	Stock			Weighted-Average				Aggregate
	Options			Exercise		Life		Intrinsic Value
	Outstanding			Price		(In Years)		(In thousands)

Outstanding at January 1, 2010		12,180,017		$	94.45
Granted		3,386			73.75
Exercised		(1,148,798	)		65.32
Cancelled		(50,368	)		98.40
Expired		(405,822	)		100.65

Outstanding at December 31, 2010		10,578,415		$	97.35		4.6	$	25,690

Exercisable at December 31, 2010		8,106,077		$	97.49		3.9	$	22,882

For 2010, 2009 and 2008, M&T received $55 million, $15 million and $25 million, respectively, in cash and realized tax benefits from the exercise of stock options of $7 million, $3 million and $4 million, respectively. The intrinsic value of stock options exercised during those periods was $21 million, $6 million and $13 million, respectively. As of December 31, 2010, there was $4 million of total unrecognized compensation cost related to non-vested stock options. That cost is expected to be recognized over a weighted-average period of 1 year. The total grant date fair value of stock options vested during 2010, 2009 and 2008 was $38 million, $37 million and $36 million, respectively. Upon the exercise of stock options, the Company generally issues shares from treasury stock to the extent available, but may also issue new shares.

Stock purchase plan

The stock purchase plan provides eligible employees of the Company with the right to purchase shares of M&T common stock through accumulated payroll deductions. Shares of M&T common stock will be issued at the end of an option period, typically one year or six months. In connection with the employee stock purchase plan, 1,000,000 shares of M&T common stock were authorized for issuance, of which 568,886 shares have been issued. There were 170,405 shares issued in 2010, 3,149 shares issued in 2009 and 2,377 shares issued in 2008. For 2010, 2009 and 2008, respectively, M&T received $8,998,000, $100,000 and $173,000 in cash for shares purchased through the employee stock purchase plan.

The Company used an option pricing model to estimate the grant date present value of purchase rights under the stock purchase plan. The estimated weighted-average grant date value per right was $14.33 in 2010, $16.39 in 2009 and $12.79 in 2008. Such values were calculated using the following weighted-average assumptions: a term of six months to one year (representing the period between grant date and exercise date); a risk-free interest rate of 0.29% in 2010, 0.45% in 2009 and 2.05% in 2008 (representing the yield on a U.S. Treasury security with a like term); expected volatility of 34% in 2010 and 2008 and 69% in 2009 (based on historical volatility of M&T’s common stock price); and an estimated dividend yield of 3.20% in 2010, 4.77% in 2009 and 3.84% in 2008 (representing the approximate annualized cash dividend rate paid with respect to a share of common stock at or near the grant date).

Deferred bonus plan

The Company provided a deferred bonus plan pursuant to which eligible employees could elect to defer all or a portion of their annual incentive compensation awards and allocate such awards to several investment options, including M&T common stock. Participants could elect the timing of distributions from the plan. Such distributions are payable in cash with the exception of balances allocated to M&T common stock which are distributable in the form of M&T common stock. Shares of M&T common stock distributable pursuant to the terms of the deferred bonus plan were 51,439 and 54,386 at December 31, 2010 and 2009, respectively. The obligation to issue shares is included in “common stock issuable” in the consolidated balance sheet. Through December 31, 2010, 117,117 shares have been issued in connection with the deferred bonus plan.

Directors’ stock plan

The Company maintains a compensation plan for non-employee members of the Company’s boards of directors and directors advisory councils that allows such members to receive all or a portion of their compensation in shares of M&T common stock. Through December 31, 2010, 148,534 shares had been issued in connection with the directors’ stock plan.

Through an acquisition, the Company assumed an obligation to issue shares of M&T common stock related to a deferred directors compensation plan. Shares of common stock issuable under such plan were 19,906 and 20,784 at December 31, 2010 and 2009, respectively. The obligation to issue shares is included in “common stock issuable” in the consolidated balance sheet.

Management stock ownership program

Through an acquisition, M&T obtained loans that were secured by M&T common stock purchased by former executives of the acquired entity. At December 31, 2009, the loan amounts owed M&T were less than the fair value of the financed stock purchased and totaled approximately $4 million. Such loans were classified as a reduction of “additional paid-in capital” in the consolidated balance sheet at that date. The amounts due to M&T were repaid in full during 2010.

Pension plans and other postretirement benefits

12 Months Ended

Dec. 31, 2010

Pension plans and other postretirement benefits [Abstract]

Pension plans and other postretirement benefits


12.	Pension plans and other postretirement benefits

The Company provides pension (defined benefit and defined contribution plans) and other postretirement benefits (including defined benefit health care and life insurance plans) to qualified retired employees. The Company uses a December 31 measurement date for all of its plans.

Net periodic pension expense for defined benefit plans consisted of the following:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Service cost	$	19,670		$	19,483		$	19,409
Interest cost on benefit obligation		47,905			46,107			42,544
Expected return on plan assets		(50,844	)		(46,976	)		(46,092	)
Amortization of prior service cost		(6,559	)		(6,559	)		(6,559	)
Recognized net actuarial loss		13,551			8,292			3,942

Net periodic pension expense	$	23,723		$	20,347		$	13,244

Net other postretirement benefits expense for defined benefit plans consisted of the following:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Service cost	$	383		$	353		$	559
Interest cost on benefit obligation		3,130			3,302			4,033
Amortization of prior service cost		176			243			275
Recognized net actuarial loss		(9	)		(19	)		42

Net other postretirement benefits expense	$	3,680		$	3,879		$	4,909

Data relating to the funding position of the defined benefit plans were as follows:


							Other
	Pension Benefits						Postretirement Benefits
	2010			2009			2010			2009
	(In thousands)

Change in benefit obligation:
Benefit obligation at beginning of year	$	857,122		$	750,913		$	56,575		$	62,950
Service cost		19,670			19,483			383			353
Interest cost		47,905			46,107			3,130			3,302
Plan participants’ contributions		—			—			2,776			3,138
Actuarial (gain) loss		64,061			26,694			6,433			(5,209	)
Settlements/curtailments		(3,231	)		(7,232	)		—			—
Business combinations		—			58,239			—			343
Medicare Part D reimbursement		—			—			789			870
Benefits paid		(37,534	)		(37,082	)		(8,411	)		(9,172	)

Benefit obligation at end of year		947,993			857,122			61,675			56,575

Change in plan assets:
Fair value of plan assets at beginning of year		766,880			550,671			—			—
Actual return on plan assets		107,846			158,945			—			—
Employer contributions		4,504			48,528			4,846			5,164
Business combinations		—			51,657			—			—
Plan participants’ contributions		—			—			2,776			3,138
Medicare Part D reimbursement		—			—			789			870
Settlements		(3,231	)		(5,839	)		—			—
Benefits and other payments		(37,534	)		(37,082	)		(8,411	)		(9,172	)

Fair value of plan assets at end of year		838,465			766,880			—			—

Funded status	$	(109,528	)	$	(90,242	)	$	(61,675	)	$	(56,575	)

Assets and liabilities recognized in the consolidated balance sheet were:
Net prepaid asset	$	6,629		$	6,266		$	—		$	—
Accrued liabilities		(116,157	)		(96,508	)		(61,675	)		(56,575	)

Amounts recognized in accumulated other comprehensive income (“AOCI”) were:
Net loss (gain)	$	232,725		$	239,219		$	2,577		$	(3,663	)
Net prior service cost		(36,572	)		(43,131	)		269			243

Pre-tax adjustment to AOCI		196,153			196,088			2,846			(3,420	)
Taxes		(76,990	)		(76,950	)		(1,117	)		1,328

Net adjustment to AOCI	$	119,163		$	119,138		$	1,729		$	(2,092	)

The Company has an unfunded supplemental pension plan for certain key executives. The projected benefit obligation and accumulated benefit obligation included in the preceding data related to such plan were $66,254,000 and $66,208,000 respectively, as of December 31, 2010 and $63,705,000 and $63,640,000, respectively, as of December 31, 2009. Included in the amounts for 2009 was approximately $15 million assumed in the Provident acquisition.

The accumulated benefit obligation for all defined benefit pension plans was $929,775,000 and $843,279,000 at December 31, 2010 and 2009, respectively. As of December 31, 2010, the accumulated benefit obligation for those defined benefit pension plans in which such obligation exceeded plan assets totaled $884,269,000 (including $66,208,000 related to the unfunded supplemental pension plan). As of December 31, 2009, the accumulated benefit obligation for those defined benefit pension plans in which such obligation exceeded plan assets totaled $797,101,000 (including $63,640,000 related to the unfunded supplemental pension plan).

GAAP requires an employer to recognize in its balance sheet as an asset or liability the overfunded or underfunded status of a defined benefit postretirement plan, measured as the difference between the fair value of plan assets and the benefit obligation. For a pension plan, the benefit obligation is the projected benefit obligation; for any other postretirement benefit plan, such as a retiree health care plan, the benefit obligation is the accumulated postretirement benefit obligation. Gains or losses and prior service costs or credits that arise during the period, but are not included as components of net periodic benefit expense, are recognized as a component of other comprehensive income. As indicated in the preceding table, as of December 31, 2010 the Company recorded a minimum liability adjustment of $198,999,000 ($196,153,000 related to pension plans and $2,846,000 related to other postretirement benefits) with a corresponding reduction of shareholders’ equity, net of applicable deferred taxes, of $120,892,000. Of the $196,153,000 related to pension plans, $11,995,000 was related to unfunded nonqualified defined benefit plans. In aggregate, the benefit plans incurred a net loss during 2010 that resulted from actual experience differing from the plan assumptions utilized and from changes in actuarial assumptions. The main factor contributing to those losses was a reduction in the discount rate used to measure the benefit obligations at December 31, 2010 to 5.25% from the 5.75% rate used at December 31, 2009. For the qualified defined benefit pension plans, the losses associated with that change in assumption were largely mitigated by gains associated with a positive return on assets of approximately $108 million as compared with an expected gain of approximately $51 million. As a result, the Company increased its minimum liability adjustment from that which was recorded at December 31, 2009 by $6,331,000 with a corresponding decrease to shareholders’ equity that, net of applicable deferred taxes, was $3,846,000. The table below reflects the changes in plan assets and benefit obligations recognized in other comprehensive income related to the Company’s postretirement benefit plans.


				Other
				Postretirement
	Pension Plans			Benefit Plans			Total
	(In thousands)

2010
Net loss (gain)	$	7,057		$	6,433		$	13,490
Amortization of prior service (cost) credit		6,559			(176	)		6,383
Amortization of (loss) gain		(13,551	)		9			(13,542	)

Total recognized in other comprehensive income, pre-tax	$	65		$	6,266		$	6,331

2009
Net loss (gain)	$	(85,265	)	$	(5,209	)	$	(90,474	)
Amortization of prior service (cost) credit		6,559			(242	)		6,317
Amortization of (loss) gain		(9,685	)		19			(9,666	)

Total recognized in other comprehensive income, pre-tax	$	(88,391	)	$	(5,432	)	$	(93,823	)

The following table reflects the amortization of amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit expense during 2011:


				Other
				Postretirement
	Pension Plans			Benefit Plans
	(In thousands)

Amortization of net prior service cost (credit)	$	(6,559	)	$	108
Amortization of net loss		20,379			18

The Company also provides a qualified defined contribution pension plan to eligible employees who were not participants in the defined benefit pension plan as of December 31, 2005 and to other employees who have elected to participate in the defined contribution plan. The Company makes contributions to the defined contribution plan each year in an amount that is based on an individual participant’s total compensation (generally defined as total wages, incentive compensation, commissions and bonuses) and years of service. Participants do not contribute to the defined contribution pension plan. Pension expense recorded in 2010, 2009 and 2008 associated with the defined contribution pension plan was approximately $14 million, $11 million and $10 million, respectively.

Assumptions

The assumed weighted-average rates used to determine benefit obligations at December 31 were:


							Other
	Pension						Postretirement
	Benefits						Benefits
	2010			2009			2010			2009

Discount rate		5.25	%		5.75	%		5.25	%		5.75	%
Rate of increase in future compensation levels		4.50	%		4.50	%		—			—

The assumed weighted-average rates used to determine net benefit expense for the years ended December 31 were:


										Other
	Pension Benefits									Postretirement Benefits
	2010			2009			2008			2010			2009			2008

Discount rate		5.75	%		6.00	%		6.00	%		5.75	%		6.00	%		6.00	%
Long-term rate of return on plan assets		6.50	%		6.50	%		7.50	%		—			—			—
Rate of increase in future compensation levels		4.50	%		4.60	%		4.60	%		—			—			—

On May 23, 2009, pension and other obligations were assumed as a result of the acquisition of Provident. Initial liabilities were determined using a 7.00% discount rate. All future benefit accruals related to the former Provident qualified pension plan were frozen.

The expected long-term rate of return assumption as of each measurement date was developed through analysis of historical market returns, current market conditions, anticipated future asset allocations, the funds’ past experience, and expectations on potential future market returns. The expected rate of return assumption represents a long-term average view of the performance of the plan assets, a return that may or may not be achieved during any one calendar year.

For measurement of other postretirement benefits, an 8.0% annual rate of increase in the per capita cost of covered health care benefits was assumed for 2011. The rate was assumed to decrease to 5% over 30 years. Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans. A one-percentage point change in assumed health care cost trend rates would have had the following effects:


	+1%		-1%
	(In thousands)

Increase (decrease) in:
Service and interest cost	$	143	$	(128	)
Accumulated postretirement benefit obligation		3,218		(2,876	)

Plan Assets

The Company’s policy is to invest the pension plan assets in a prudent manner for the purpose of providing benefit payments to participants and mitigating reasonable expenses of administration. The Company’s investment strategy is designed to provide a total return that, over the long-term, places a strong emphasis on the preservation of capital. The strategy attempts to maximize investment returns on assets at a level of risk deemed appropriate by the Company while complying with applicable regulations and laws. The investment strategy utilizes asset allocation as a principal determinant for establishing an appropriate risk profile. The target allocations for plan assets are generally 55 to 70 percent equity securities, 25 to 40 percent debt securities, and 3 to 10 percent money-market funds or other short-term investments. Equity securities include investments in large-cap and mid-cap companies located in the United States, equity mutual funds with international investments, and, to a lesser extent, direct investments in foreign-based companies. Debt securities include corporate bonds of companies from diversified industries, mortgage-backed securities guaranteed by government agencies, U.S. Treasury securities, and mutual funds that invest in debt securities. Returns on invested assets are periodically compared with target market indices for each asset type to aid management in evaluating such returns. Furthermore, management regularly reviews the investment policy and may, if deemed appropriate, make changes to the target allocations noted above.

The fair values of the Company’s pension plan assets at December 31, 2010, by asset category, are as follows:


	Fair Value Measurement of Plan Assets At December 31, 2010
			Quoted Prices
			in Active		Significant		Significant
			Markets		Observable		Unobservable
			for Identical Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
	(In thousands)

Asset category:
Money-market funds	$	26,389		26,389		—		—
Equity securities:
M&T		106,891		106,891		—		—
Domestic(a)		148,218		148,218		—		—
International		9,690		9,690		—		—
Mutual funds:
Domestic		54,039		54,039		—		—
International		150,961		150,961		—		—

		469,799		469,799		—		—

Debt securities:
Corporate(b)		204,899		—		204,899		—
Government		65,589		—		65,589		—
International		7,143		—		7,143		—
Mutual funds:
Domestic(c)		35,594		35,594		—		—
International		25,491		25,491		—		—

		338,716		61,085		277,631		—

Total(d)	$	834,904		557,273		277,631		—

The fair values of the Company’s pension plan assets at December 31, 2009, by asset category, are as follows:


	Fair Value Measurement of Plan Assets At December 31, 2009
			Quoted Prices
			in Active		Significant		Significant
			Markets		Observable		Unobservable
			for Identical Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
	(In thousands)

Asset category:
Money-market funds	$	27,560		27,560		—		—
Equity securities:
M&T		82,136		82,136		—		—
Domestic(a)		162,401		162,401		—		—
International		8,021		8,021		—		—
Mutual Funds:
Domestic		40,195		40,195		—		—
International		130,767		130,767		—		—

		423,520		423,520		—		—

Debt securities:
Corporate(b)		194,515		—		194,515		—
Government		50,054		—		50,054		—
International		5,440		—		5,440		—
Mutual Funds:
Domestic(c)		38,833		38,833		—		—
International		23,320		23,320		—		—

		312,162		62,153		250,009		—

Total(d)	$	763,242		513,233		250,009		—


(a)		This category is comprised of equities of companies primarily within the mid-cap and large-cap sector of the U.S. economy and range across diverse industries.

(b)		This category represents investment grade bonds of U.S. issuers from diverse industries.

(c)		Approximately 30% of the mutual funds are invested in investment grade bonds of U.S. issuers and 70% in high-yielding bonds. The holdings within the funds are spread across diverse industries.

(d)		Excludes dividends and interest receivable totaling $3,561,000 and $3,638,000 at December 31, 2010 and 2009, respectively.

Pension plan assets included common stock of M&T with a fair value of $106,891,000 (12.7% of total plan assets) at December 31, 2010 and $82,136,000 (10.7% of total plan assets) at December 31, 2009. No other investment in securities of a non-U.S. Government or government agency issuer exceeded ten percent of plan assets at December 31, 2010.

The Company makes contributions to its funded qualified defined benefit pension plans as required by government regulation or as deemed appropriate by management after considering factors such as the fair value of plan assets, expected returns on such assets, and the present value of benefit obligations of the plans. Subject to the impact of actual events and circumstances that may occur in 2011, the Company may make contributions to the qualified defined benefit pension plans in 2011, but the amount of any such contribution has not yet been determined. No minimum contribution is required in 2011 under government regulations for the qualified defined benefit pension plans. The Company’s contributions to the qualified defined benefit pension plans totaled $44 million in 2009 in the form of common stock of M&T. The Company did not make any contributions to those plans in 2010. The Company regularly funds the payment of benefit obligations for the supplemental defined benefit pension and postretirement benefit plans because such plans do not hold assets for investment. Payments made by the Company for supplemental pension benefits were $4,504,000 and $4,239,000 in 2010 and 2009, respectively. Payments made by the Company for postretirement benefits were $4,846,000 and $5,164,000 in 2010 and 2009, respectively. Payments for supplemental pension and other postretirement benefits for 2011 are not expected to differ from those made in 2010 by an amount that will be material to the Company’s consolidated financial position.

Estimated benefits expected to be paid in future years related to the Company’s defined benefit pension and other postretirement benefits plans are as follows:


			Other
	Pension		Postretirement
	Benefits		Benefits
	(In thousands)

Year ending December 31:
2011	$	43,599	$	6,399
2012		46,144		6,294
2013		48,794		6,236
2014		52,435		6,177
2015		54,847		6,081
2016 through 2020		326,134		28,318

The Company has a retirement savings plan (“RSP”) that is a defined contribution plan in which eligible employees of the Company may defer up to 50% of qualified compensation via contributions to the plan. The Company makes an employer matching contribution in an amount equal to 75% of an employee’s contribution, up to 4.5% of the employee’s qualified compensation. Employees’ accounts, including employee contributions, employer matching contributions and accumulated earnings thereon, are at all times fully vested and nonforfeitable. Employee benefits expense resulting from the Company’s contributions to the RSP totaled $24,683,000, $23,719,000 and $23,311,000 in 2010, 2009 and 2008, respectively.

Income Taxes

12 Months Ended

Dec. 31, 2010

Income taxes [Abstract]

Income taxes


13.	Income taxes

The components of income tax expense (benefit) were as follows:


	Year Ended December 31
	2010		2009		2008
	(In thousands)

Current
Federal	$	250,489	$	52,792	$	231,426
State and city		55,071		4,107		(30,514	)

Total current		305,560		56,899		200,912

Deferred
Federal		47,123		67,372		(10,095	)
State and city		3,945		15,129		(6,925	)

Total deferred		51,068		82,501		(17,020	)

Total income taxes applicable to pre-tax income	$	356,628	$	139,400	$	183,892

The Company files a consolidated federal income tax return reflecting taxable income earned by all subsidiaries. In prior years, applicable federal tax law allowed certain financial institutions the option of deducting as bad debt expense for tax purposes amounts in excess of actual losses. In accordance with GAAP, such financial institutions were not required to provide deferred income taxes on such excess. Recapture of the excess tax bad debt reserve established under the previously allowed method will result in taxable income if M&T Bank fails to maintain bank status as defined in the Internal Revenue Code or charges are made to the reserve for other than bad debt losses. At December 31, 2010, M&T Bank’s tax bad debt reserve for which no federal income taxes have been provided was $79,121,000. No actions are planned that would cause this reserve to become wholly or partially taxable.

Income taxes attributable to gains or losses on bank investment securities were benefits of $32,778,000, $53,824,000 and $57,859,000 in 2010, 2009 and 2008, respectively. No alternative minimum tax expense was recognized in 2010, 2009 or 2008.

Total income taxes differed from the amount computed by applying the statutory federal income tax rate to pre-tax income as follows:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Income taxes at statutory rate	$	382,476		$	181,752		$	258,923
Increase (decrease) in taxes:
Tax-exempt income		(32,466	)		(31,071	)		(31,668	)
State and city income taxes, net of federal income tax effect		38,360			12,503			(24,335	)
Low income housing credits		(29,882	)		(20,749	)		(21,170	)
Other		(1,860	)		(3,035	)		2,142

	$	356,628		$	139,400		$	183,892

Deferred tax assets (liabilities) were comprised of the following at December 31:


	2010			2009			2008
	(In thousands)

Losses on loans and other assets	$	550,970		$	642,427		$	389,177
Postretirement and other employee benefits		48,863			46,316			43,874
Incentive compensation plans		27,388			27,835			28,489
Interest on loans		43,563			35,772			38,835
Retirement benefits		21,694			14,305			62,185
Stock-based compensation		70,641			69,881			58,837
Unrealized investment losses		54,557			140,821			331,616
Depreciation and amortization		13,332			6,274			10,141
Capitalized servicing rights		—			—			3,243
Other		51,768			40,281			28,478

Gross deferred tax assets		882,776			1,023,912			994,875

Leasing transactions		(294,510	)		(306,799	)		(316,444	)
Capitalized servicing rights		(14,739	)		(8,412	)		—
Interest on subordinated note exchange		(13,534	)		(15,051	)		(16,264	)
Other		(36,080	)		(32,617	)		(9,691	)

Gross deferred tax liabilities		(358,863	)		(362,879	)		(342,399	)

Net deferred tax asset	$	523,913		$	661,033		$	652,476

The Company believes that it is more likely than not that the deferred tax assets will be realized through taxable earnings or alternative tax strategies.

The income tax credits shown in the statement of income of M&T in note 26 arise principally from operating losses before dividends from subsidiaries.

A reconciliation of the beginning and ending amount of unrecognized tax benefits follows:


	Federal,						Unrecognized
	State and			Accrued			Income Tax
	Local Tax			Interest			Benefits
	(In thousands)

Gross unrecognized tax benefits at January 1, 2008	$	120,044		$	26,368		$	146,412
Increases in unrecognized tax benefits as a result of tax positions taken during 2008		2,405			—			2,405
Increases in unrecognized tax benefits as a result of tax positions taken during prior years		—			15,837			15,837
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years		(52,399	)		(15,533	)		(67,932	)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities		(31,763	)		(9,116	)		(40,879	)

Gross unrecognized tax benefits at December 31, 2008		38,287			17,556			55,843
Increases in unrecognized tax benefits as a result of tax positions taken during 2009		400			—			400
Increases in unrecognized tax benefits as a result of tax positions taken during prior years		—			3,675			3,675
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination		(9,902	)		(1,392	)		(11,294	)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities		(825	)		(331	)		(1,156	)
Unrecognized tax benefits acquired in a business combination		337			—			337

Gross unrecognized tax benefits at December 31, 2009		28,297			19,508			47,805
Increases in unrecognized tax benefits as a result of tax positions taken during prior years		—			11,468			11,468
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination		(1,403	)		(670	)		(2,073	)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities		(967	)		(549	)		(1,516	)
Decreases in unrecognized tax benefits as a result of tax positions taken in prior years		(1,074	)		(9,061	)		(10,135	)

Gross unrecognized tax benefits at December 31, 2010	$	24,853		$	20,696			45,549

Less: Federal, state and local income tax benefits								(15,478	)

Net unrecognized tax benefits at December 31, 2010 that, if recognized, would impact the effective income tax rate							$	30,071

The Company’s policy is to recognize interest and penalties, if any, related to unrecognized tax benefits in income taxes in the consolidated statement of income. The balance of accrued interest at December 31, 2010 is included in the table above. The Company’s federal, state and local income tax returns are routinely subject to examinations from various governmental taxing authorities. Such examinations may result in challenges to the tax return treatment applied by the Company to specific transactions. Management believes that the assumptions and judgment used to record tax-related assets or liabilities have been appropriate. Should determinations rendered by tax authorities ultimately indicate that management’s assumptions were inappropriate, the result and adjustments required could have a material effect on the Company’s results of operations. Under statute, the Company’s federal income tax returns for the years 2007 and 2008 could be adjusted by the Internal Revenue Service, although examinations for those tax years have been concluded. The federal income tax return for 2009 is currently under examination, although no issues have been raised that would materially impact the effective tax rate. The Company also files income tax returns in over forty state and local jurisdictions. Substantially all material state and local matters have been concluded for years through 2001. Some tax returns for years after 2001 are presently under examination. It is not reasonably possible to estimate when any of those examinations will be completed or if others will be commenced.

Earnings per common share

12 Months Ended

Dec. 31, 2010

Earnings per common share [Abstract]

Earnings per common share


14.	Earnings per common share

The computations of basic earnings per common share follow:


	Year Ended December 31
	2010			2009			2008
	(In thousands, except per share)

Income available to common shareholders:
Net income	$	736,161		$	379,891		$	555,887
Less: Preferred stock dividends(a)		(40,225	)		(36,081	)		(667	)
Amortization of preferred stock discount(a)		(10,518	)		(8,130	)		(124	)

Net income available to common equity		685,418			335,680			555,096
Less: Income attributable to unvested stock-based compensation awards		(9,592	)		(3,674	)		—

Net income available to common shareholders	$	675,826		$	332,006		$	555,096
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		119,852			115,838			110,211
Less: Unvested stock-based compensation awards		(1,661	)		(1,178	)		—

Weighted-average shares outstanding		118,191			114,660			110,211
Basic earnings per common share	$	5.72		$	2.90		$	5.04


(a)		Including impact of not as yet declared cumulative dividends.

The computations of diluted earnings per common share follow:


	Year Ended December 31
	2010			2009			2008
	(In thousands, except per share)

Net income available to common equity	$	685,418		$	335,680		$	555,096
Less: Income attributable to unvested stock-based compensation awards		(9,565	)		(3,674	)		—

Net income available to common shareholders	$	675,853		$	332,006		$	555,096
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		119,852			115,838			110,211
Less: Unvested stock-based compensation awards		(1,661	)		(1,178	)		—
Plus: Incremental shares from assumed conversion of stock-based compensation awards and convertible preferred stock		652			116			693

Adjusted weighted-average shares outstanding		118,843			114,776			110,904
Diluted earnings per common share	$	5.69		$	2.89		$	5.01

GAAP requires that for financial statements issued for fiscal years beginning after December 15, 2008, unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per common share pursuant to the two-class method. In 2009 and 2010, the Company issued stock-based compensation awards in the form of restricted stock and restricted stock units, which, in accordance with GAAP, are considered participating securities. Beginning in 2009, the Company’s earnings per common share are calculated using the two-class method. The effects of the application of the two-class method to previously reported earnings per common share amounts were immaterial.

Stock-based compensation awards, warrants to purchase common stock of M&T and preferred stock convertible into shares of M&T common stock representing approximately 11,231,000, 15,040,000 and 10,082,000 common shares during 2010, 2009 and 2008, respectively, were not included in the computations of diluted earnings per common share because the effect on those years would be antidilutive.

Comprehensive income

12 Months Ended

Dec. 31, 2010

Comprehensive income [Abstract]

Comprehensive income


15.	Comprehensive income

The following table displays the components of other comprehensive income:


	Before-tax			Income
	Amount			Taxes			Net
	(In thousands)

For the year ended December 31, 2010
Unrealized gains (losses) on investment securities:
Available-for-sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):
Securities with OTTI charges	$	(104,039	)	$	40,566		$	(63,473	)
Less: OTTI charges recognized in net income		(81,199	)		31,552			(49,647	)

Net unrealized losses on investment securities with OTTI		(22,840	)		9,014			(13,826	)
AFS investment securities — all other:
Unrealized holding gains		132,128			(51,624	)		80,504
Less: reclassification adjustment for gains realized in net income		1,581			(610	)		971
Less: securities with OTTI charges		(104,039	)		40,566			(63,473	)

		234,586			(91,580	)		143,006
Held-to-maturity (“HTM”) investment securities previously transferred from AFS to HTM with OTTI:
Securities with OTTI charges		(11,908	)		4,674			(7,234	)
Less: Impairment previously reflected in other comprehensive income		(7,984	)		3,134			(4,850	)
Less: OTTI charges recognized in net income		(5,082	)		1,995			(3,087	)

Net change for investment securities with OTTI		1,158			(455	)		703

Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		8,264			(3,243	)		5,021

		9,422			(3,698	)		5,724
Net unrealized gains on investment securities		221,168			(86,264	)		134,904
Reclassification to income for amortization of gains on terminated cash flow hedges		(448	)		167			(281	)
Defined benefit plans liability adjustment		(6,331	)		2,485			(3,846	)

	$	214,389		$	(83,612	)	$	130,777

For the year ended December 31, 2009
Unrealized gains (losses) on investment securities:
AFS investment securities with OTTI:
Securities with OTTI charges	$	(264,363	)	$	103,409		$	(160,954	)
Less: OTTI charges recognized in net income		(138,297	)		54,115			(84,182	)

Net unrealized losses on investment securities with OTTI		(126,066	)		49,294			(76,772	)
AFS investment securities — all other:
Unrealized holding gains		375,733			(144,228	)		231,505
Less: reclassification adjustment for gains realized in net income		219			(85	)		134
Less: securities with OTTI charges		(264,363	)		103,409			(160,954	)

		639,877			(247,552	)		392,325
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		14,027			7,463			21,490

Net unrealized gains on investment securities		527,838			(190,795	)		337,043
Reclassification to income for amortization of losses on terminated cash flow hedges		10,761			(4,204	)		6,557
Defined benefit plans liability adjustment		93,823			(36,539	)		57,284

	$	632,422		$	(231,538	)	$	400,884

For the year ended December 31, 2008
Unrealized losses on AFS investment securities:
Unrealized holding losses	$	(1,001,417	)	$	331,461		$	(669,956	)
Add: transfer of investment securities from AFS to HTM		86,943			(20,972	)		65,971
Less: reclassification adjustment for losses recognized in net income		(180,274	)		10,863			(169,411	)

		(734,200	)		299,626			(434,574	)
Unrealized holding losses on investment securities transferred from AFS to HTM:
Unrealized holding losses transferred		(86,943	)		20,972			(65,971	)
Reclassification to income of unrealized holding losses		5,101			(1,818	)		3,283

		(81,842	)		19,154			(62,688	)

Net unrealized losses on investment securities		(816,042	)		318,780			(497,262	)
Cash flow hedges:
Unrealized losses on terminated cash flow hedges		(20,225	)		7,887			(12,338	)
Reclassification to income for amortization of losses on terminated cash flow hedges		25,234			(9,848	)		15,386

		5,009			(1,961	)		3,048
Defined benefit plans liability adjustment		(210,161	)		82,316			(127,845	)

	$	(1,021,194	)	$	399,135		$	(622,059	)

During the third quarter of 2008 the Company transferred private collateralized mortgage obligations having a fair value of $298 million and a cost basis of $385 million from its available-for-sale investment securities portfolio to the held-to-maturity portfolio.

Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses) as follows:


	Investment			All Other			Cash			Defined
	Securities			Investment			Flow			Benefit
	With OTTI			Securities			Hedges			Plans			Total
	(In thousands)

Balance at January 1, 2008	$	—		$	(59,406	)	$	(8,931	)	$	(46,485	)	$	(114,822	)
Net gain (loss) during 2008		—			(497,262	)		3,048			(127,845	)		(622,059	)

Balance at December 31, 2008		—			(556,668	)		(5,883	)		(174,330	)		(736,881	)
Net gain (loss) during 2009		(76,772	)		413,815			6,557			57,284			400,884

Balance at December 31, 2009		(76,772	)		(142,853	)		674			(117,046	)		(335,997	)
Net gain (loss) during 2010		(10,281	)		145,185			(281	)		(3,846	)		130,777

Balance at December 31, 2010	$	(87,053	)	$	2,332		$	393		$	(120,892	)	$	(205,220	)

Other income and other expense

12 Months Ended

Dec. 31, 2010

Other Nonoperating Income (Expense) [Abstract]

Other income and other expense


16.	Other income and other expense

The following items, which exceeded 1% of total interest income and other income in the respective period, were included in either “other revenues from operations” or “other costs of operations” in the consolidated statement of income:


	Year Ended December 31
	2010		2009		2008
	(In thousands)

Other income:
Bank owned life insurance	$	50,483	$	49,152	$	49,006
Credit-related fee income		62,294		56,150		55,293
Letter of credit fees		49,762		44,005
Other expense:
Professional services		128,629		117,523		112,632
Amortization of capitalized servicing rights		56,582		62,268		65,722
Advertising and promotion		41,869		39,364

International Activities

12 Months Ended

Dec. 31, 2010

International Activities [Abstract]

International activities


17.	International activities

The Company engages in certain international activities consisting largely of collecting Eurodollar deposits, engaging in foreign currency trading, providing credit to support the international activities of domestic companies and holding certain loans to foreign borrowers. Net assets identified with international activities amounted to $112,851,000 and $61,849,000 at December 31, 2010 and 2009, respectively. Such assets included $107,310,000 and $55,336,000, respectively, of loans to foreign borrowers. Deposits at M&T Bank’s Cayman Islands office were $1,605,916,000 and $1,050,438,000 at December 31, 2010 and 2009, respectively. The Company uses such deposits to facilitate customer demand and as an alternative to short-term borrowings when the costs of such deposits seem reasonable.

Derivative financial instruments

12 Months Ended

Dec. 31, 2010

Derivative financial instruments [Abstract]

Derivative financial instruments


18.	Derivative financial instruments

As part of managing interest rate risk, the Company enters into interest rate swap agreements to modify the repricing characteristics of certain portions of the Company’s portfolios of earning assets and interest-bearing liabilities. The Company designates interest rate swap agreements utilized in the management of interest rate risk as either fair value hedges or cash flow hedges. Interest rate swap agreements are generally entered into with counterparties that meet established credit standards and most contain master netting and collateral provisions protecting the at-risk party. Based on adherence to the Company’s credit standards and the presence of the netting and collateral provisions, the Company believes that the credit risk inherent in these contracts is not significant as of December 31, 2010.

The net effect of interest rate swap agreements was to increase net interest income by $42 million in 2010, $38 million in 2009 and $16 million in 2008. The average notional amounts of interest rate swap agreements impacting net interest income that were entered into for interest rate risk management purposes were $1.01 billion in 2010, $1.08 billion in 2009 and $1.27 billion in 2008.

Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows:


	Notional		Average		Weighted-Average Rate						Estimated Fair
	Amount		Maturity		Fixed			Variable			Value Gain
	(In thousands)		(In years)								(In thousands)

December 31, 2010
Fair value hedges:
Fixed rate long-term borrowings(a)	$	900,000		6.4		6.07	%		1.84	%	$	96,637

December 31, 2009
Fair value hedges:
Fixed rate time deposits(a)	$	25,000		3.7		5.30	%		0.34	%	$	503
Fixed rate long-term borrowings(a)		1,037,241		6.5		6.33			2.12			53,983

	$	1,062,241		6.4		6.30	%		2.07	%	$	54,486


(a)		Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate.

In response to changes in its interest rate risk profile, during 2008 the Company terminated interest rate swap agreements with a notional amount of $1.5 billion that had originally been entered into as cash flow hedges of variable rate long-term borrowings. The Company recognized a $37 million loss as a result of the termination. Amounts pertaining to these interest rate swap agreements that were reclassified from accumulated other comprehensive income to increase interest expense were $11 million and $26 million for 2009 and 2008, respectively.

The notional amount of interest rate swap agreements entered into for risk management purposes that were outstanding at December 31, 2010 mature in 2016 and 2017.

The Company utilizes commitments to sell residential and commercial real estate loans to hedge the exposure to changes in the fair value of real estate loans held for sale. Such commitments have generally been designated as fair value hedges. The Company also utilizes commitments to sell real estate loans to offset the exposure to changes in fair value of certain commitments to originate real estate loans for sale.

Derivative financial instruments used for trading purposes included interest rate contracts, foreign exchange and other option contracts, foreign exchange forward and spot contracts, and financial futures. Interest rate contracts entered into for trading purposes had notional values of $12.8 billion and $13.9 billion at December 31, 2010 and 2009, respectively. The notional amounts of foreign currency and other option and futures contracts entered into for trading purposes aggregated $769 million and $608 million at December 31, 2010 and 2009, respectively.

Information about the fair values of derivative instruments in the Company’s consolidated balance sheet and consolidated statement of income follows:


	Asset Derivatives				Liability Derivatives
	Fair Value				Fair Value
	December 31				December 31
	2010		2009		2010		2009
	(In thousands)

Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements(a)	$	96,637	$	54,486	$	—	$	—
Commitments to sell real estate loans(a)		4,880		6,009		1,062		171

		101,517		60,495		1,062		171
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale(a)		2,827		4,428		583		4,508
Commitments to sell real estate loans(a)		10,322		13,293		1,962		1,360
Trading:
Interest rate contracts(b)		345,632		317,651		321,461		290,104
Foreign exchange and other option and futures contracts(b)		11,267		11,908		11,761		12,094

		370,048		347,280		335,767		308,066

Total derivatives	$	471,565	$	407,775	$	336,829	$	308,237


(a)		Asset derivatives are reported in other assets and liability derivatives are reported in other liabilities.

(b)		Asset derivatives are reported in trading account assets and liability derivatives are reported in other liabilities.


	Amount of Unrealized Gain (Loss) Recognized
	Year Ended						Year Ended					Year Ended
	December 31, 2010						December 31, 2009					December 31, 2008
	Derivative			Hedged Item			Derivative			Hedged Item		Derivative			Hedged Item
	(In thousands)

Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate time deposits(a)	$	(503	)	$	503		$	(1,797	)	$	1,789	$	883		$	(895	)
Fixed rate long-term borrowings(a)		41,628			(39,802	)		(91,093	)		85,679		127,563			(121,898	)

Total	$	41,125		$	(39,299	)	$	(92,890	)	$	87,468	$	128,446		$	(122,793	)

Derivatives not designated as hedging instruments
Trading:
Interest rate contracts(b)	$	3,760					$	(3,622	)			$	6,529
Foreign exchange and other option and futures contracts(b)		(307	)					337					(1,209	)

Total	$	3,453					$	(3,285	)			$	5,320


(a)		Reported as other revenues from operations.

(b)		Reported as trading account and foreign exchange gains.

In addition, the Company also has commitments to sell and commitments to originate residential and commercial real estate loans, which are considered derivatives. The Company designates certain of the commitments to sell real estate loans as fair value hedges of real estate loans held for sale. The Company also utilizes commitments to sell real estate loans to offset the exposure to changes in the fair value of certain commitments to originate real estate loans for sale. As a result of these activities, net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans were approximately $17 million and $20 million at December 31, 2010 and 2009, respectively. Changes in unrealized gains and losses are included in mortgage banking revenues and, in general, are realized in subsequent periods as the related loans are sold and commitments satisfied.

The aggregate fair value of derivative financial instruments in a net liability position at December 31, 2010 for which the Company was required to post collateral was $223 million. The fair value of collateral posted for such instruments was $210 million.

The Company’s credit exposure with respect to the estimated fair value as of December 31, 2010 of interest rate swap agreements used for managing interest rate risk has been substantially mitigated through master netting arrangements with trading account interest rate contracts with the same counterparties as well as counterparty postings of $55 million of collateral with the Company. Trading account interest rate swap agreements entered into with customers are subject to the Company’s credit standards and often contain collateral provisions.

Variable interest entities and asset securitizations

12 Months Ended

Dec. 31, 2010

Variable interest entities and asset securitizations [Abstract]

Variable interest entities and asset securitizations


19.	Variable interest entities and asset securitizations

Effective January 1, 2010, the Financial Accounting Standards Board (“FASB”) amended accounting guidance related to the consolidation of variable interest entities to eliminate the quantitative approach previously required for determining the primary beneficiary of a variable interest entity. The amended guidance instead requires a reporting entity to qualitatively assess the determination of the primary beneficiary of a variable interest entity based on whether the reporting entity has the power to direct the activities that most significantly impact the variable interest entity’s economic performance and has the obligation to absorb losses or the right to receive benefits of the variable interest entity that could potentially be significant to the variable interest entity. The amended guidance requires ongoing reassessments of whether the reporting entity is the primary beneficiary of a variable interest entity.

Also effective January 1, 2010, the FASB amended accounting guidance related to accounting for transfers of financial assets to eliminate the exceptions for qualifying special-purpose entities from the consolidation guidance and the exception that permitted sale accounting for certain mortgage securitizations when a transferor has not surrendered control over the transferred assets. The recognition and measurement provisions of the amended guidance were required to be applied prospectively. Additionally, beginning January 1, 2010, the concept of a qualifying special-purpose entity is no longer relevant for accounting purposes. Therefore, formerly qualifying special-purpose entities had to be re-evaluated for consolidation in accordance with applicable consolidation guidance, including the new accounting guidance relating to the consolidation of variable interest entities discussed in the previous paragraph.

In 2002 and 2003, the Company transferred approximately $1.9 billion of one-to-four family residential mortgage loans to qualified special-purpose trusts in two non-recourse securitization transactions. In exchange for the loans, the Company received cash, no more than 88% of the resulting securities, and the servicing rights to the loans. Through December 31, 2009, all of the retained securities were classified as investment securities available for sale as the qualified special-purpose trusts were not included in the Company’s consolidated financial statements. Effective January 1, 2010, the Company determined that it was the primary beneficiary of both securitization trusts under the amended consolidation rules considering its role as servicer and its retained subordinated interests in the trusts. As a result, beginning January 1, 2010, the Company included the one-to-four family residential mortgage loans that were included in the two non-recourse securitization transactions in its consolidated financial statements. The effect of that consolidation on January 1, 2010 was to increase loans receivable by $424 million, decrease the amortized cost of available-for-sale investment securities by $360 million (fair value of $355 million), and increase borrowings by $65 million. The transition adjustment at January 1, 2010 as a result of the Company’s adoption of the new accounting requirements was not significant. In the second quarter of 2010, the 2002 securitization trust was terminated as the Company exercised its right to purchase the underlying mortgage loans pursuant to the clean-up call provisions of the qualified special-purpose trust. At December 31, 2010, the carrying value of the loans in the remaining securitization trust and the outstanding principal amount of mortgage-backed securities issued by the qualified special-purpose trust were each $265 million. The principal amount of such securities held by the Company was $225 million. The remainder of the outstanding mortgage-backed securities were held by parties unrelated to M&T. Because the transaction was non-recourse, the Company’s maximum exposure to loss as a result of its association with the trust at December 31, 2010 is limited to realizing the carrying value of the loans less the $40 million carrying value of the mortgage-backed securities outstanding to third parties.

In 2009 and 2008, the Company securitized approximately $141 million and $875 million, respectively, of one-to-four family residential mortgage loans in guaranteed mortgage securitizations with Fannie Mae. There were no such securitizations in 2010. The Company recognized no gain or loss on the transactions as it retained all of the resulting securities. Such securities were classified as investment securities available for sale. The Company expects no material credit-related losses on the retained securities as a result of the guarantees by Fannie Mae.

Other variable interest entities in which the Company holds a significant variable interest are described below.

As described in note 9, M&T has issued junior subordinated debentures payable to various trusts that have issued Capital Securities. M&T owns the common securities of those trust entities. The Company is not considered to be the primary beneficiary of those entities and, accordingly, the trusts are not included in the Company’s consolidated financial statements. At December 31, 2010 and 2009, the Company included the Junior Subordinated Debentures as “long-term borrowings” in its consolidated balance sheet. The Company has recognized $34 million in other assets for its “investment” in the common securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the junior subordinated debentures associated with preferred capital securities described in note 9.

The Company has invested as a limited partner in various real estate partnerships that collectively had total assets of approximately $1.1 billion and $1.0 billion at December 31, 2010 and 2009, respectively. Those partnerships generally construct or acquire properties for which the investing partners are eligible to receive certain federal income tax credits in accordance with government guidelines. Such investments may also provide tax deductible losses to the partners. The partnership investments also assist the Company in achieving its community reinvestment initiatives. As a limited partner, there is no recourse to the Company by creditors of the partnerships. However, the tax credits that result from the Company’s investments in such partnerships are generally subject to recapture should a partnership fail to comply with the respective government regulations. The Company’s maximum exposure to loss of its investments in such partnerships was $258 million, including $81 million of unfunded commitments, at December 31, 2010 and $246 million, including $89 million of unfunded commitments, at December 31, 2009. The Company has not provided financial or other support to the partnerships that was not contractually required. Management currently estimates that no material losses are probable as a result of the Company’s involvement with such entities. In accordance with the accounting provisions for variable interest entities, the Company, in its position as limited partner, does not direct the activities that most significantly impact the economic performance of the partnerships and, therefore, the partnership entities are not included in the Company’s consolidated financial statements.

Fair value measurements

12 Months Ended

Dec. 31, 2010

Fair value measurements [Abstract]

Fair value measurements


20.	Fair value measurements

GAAP permits an entity to choose to measure eligible financial instruments and other items at fair value. The Company has not made any fair value elections at December 31, 2010.

Pursuant to GAAP, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level hierarchy exists in GAAP for fair value measurements based upon the inputs to the valuation of an asset or liability.


	•	Level 1 — Valuation is based on quoted prices in active markets for identical assets and liabilities.


	•	Level 2 — Valuation is determined from quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar instruments in markets that are not active or by model-based techniques in which all significant inputs are observable in the market.

	•	Level 3 — Valuation is derived from model-based and other techniques in which at least one significant input is unobservable and which may be based on the Company’s own estimates about the assumptions that market participants would use to value the asset or liability.

When available, the Company attempts to use quoted market prices in active markets to determine fair value and classifies such items as Level 1 or Level 2. If quoted market prices in active markets are not available, fair value is often determined using model-based techniques incorporating various assumptions including interest rates, prepayment speeds and credit losses. Assets and liabilities valued using model-based techniques are classified as either Level 2 or Level 3, depending on the lowest level classification of an input that is considered significant to the overall valuation. The following is a description of the valuation methodologies used for the Company’s assets and liabilities that are measured on a recurring basis at estimated fair value.

Trading account assets and liabilities

Trading account assets and liabilities consist primarily of interest rate swap agreements and foreign exchange contracts with customers who require such services with offsetting positions with third parties to minimize the Company’s risk with respect to such transactions. The Company generally determines the fair value of its derivative trading account assets and liabilities using externally developed pricing models based on market observable inputs and therefore classifies such valuations as Level 2. Mutual funds held in connection with deferred compensation arrangements have been classified as Level 1 valuations. Valuations of investments in municipal and other bonds can generally be obtained through reference to quoted prices in less active markets for the same or similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2.

Investment securities available for sale

The majority of the Company’s available-for-sale investment securities have been valued by reference to prices for similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2. Certain investments in mutual funds and equity securities are actively traded and therefore have been classified as Level 1 valuations.

Trading activity in privately issued mortgage-backed securities has been limited. The markets for such securities were generally characterized by a sharp reduction of non-agency mortgage-backed securities issuances, a significant reduction in trading volumes and wide bid-ask spreads, all driven by the lack of market participants. Although estimated prices were generally obtained for such securities, the Company was significantly restricted in the level of market observable assumptions used in the valuation of its privately issued mortgage-backed securities portfolio. Specifically, market assumptions regarding credit adjusted cash flows and liquidity influences on discount rates were difficult to observe at the individual bond level. Because of the inactivity in the markets and the lack of observable valuation inputs, the Company has classified the valuation of privately issued mortgage-backed securities as Level 3.

In April 2009, the FASB issued new accounting rules that provided guidance for estimating fair value when the volume and level of trading activity for an asset or liability have significantly decreased. The Company has concluded that there has been a significant decline in the volume and level of activity in the market for privately issued mortgage-backed securities. Therefore, the Company supplemented its determination of fair value for many of its privately issued mortgage-backed securities by obtaining pricing indications from two independent sources at December 31, 2010 and 2009. However, the Company could not readily ascertain that the basis of such valuations could be ascribed to orderly and observable trades in the market for privately issued residential mortgage-backed securities. As a result, the Company also performed internal modeling to estimate the cash flows and fair value of privately issued residential mortgage-backed securities with an amortized cost basis of $1.5 billion at December 31, 2010 and $1.9 billion at December 31, 2009. The Company’s internal modeling techniques included discounting estimated bond-specific cash flows using assumptions about cash flows associated with loans underlying each of the bonds, including estimates about the timing and amount of credit losses and prepayments. In estimating those cash flows, the Company used assumptions as to future delinquency, defaults and loss rates, including assumptions for further home price depreciation. Differences between internal model valuations and external pricing indications were generally considered to be reflective of the lack of liquidity in the market for privately issued mortgage-backed securities given the nature of the cash flow modeling performed in the Company’s assessment of value. To determine the point within the range of potential values that was most representative of fair value under current market conditions for each of the bonds, the Company computed values based on judgmentally applied weightings of the internal model valuations and the indications obtained from the average of the two independent pricing sources. Weightings applied to internal model valuations generally ranged from zero to 40% depending on bond structure and collateral type, with prices for bonds in non-senior tranches generally receiving lower weightings on the internal model results and senior bonds receiving a higher model weighting. At December 31, 2010, weighted-average reliance on internal model pricing for the bonds modeled was 34% with a 66% average weighting placed on the values provided by the independent sources. The Company concluded its estimate of fair value for the $1.5 billion of privately issued residential mortgage-backed securities to approximate $1.3 billion, which implies a weighted-average market yield based on reasonably likely cash flows of 8.2%. Other valuations of privately issued residential mortgage-backed securities were determined by reference to independent pricing sources without adjustment.

Included in collateralized debt obligations are securities backed by trust preferred securities issued by financial institutions and other entities. Given the severe disruption in the credit markets and lack of observable trade information, the Company could not obtain pricing indications for many of these securities from its two primary independent pricing sources. The Company, therefore, performed internal modeling to estimate the cash flows and fair value of its portfolio of securities backed by trust preferred securities at December 31, 2010 and 2009. The modeling techniques included discounting estimated cash flows using bond-specific assumptions about defaults, deferrals and prepayments of the trust preferred securities underlying each bond. The estimation of cash flows included assumptions as to future collateral defaults and related loss severities. The resulting cash flows were then discounted by reference to market yields observed in the single-name trust preferred securities market. At December 31, 2010, the total amortized cost and fair value of securities backed by trust preferred securities issued by financial institutions and other entities were $95 million and $111 million, respectively, and at December 31, 2009 were $103 million and $115 million, respectively. Privately issued mortgage-backed securities and securities backed by trust preferred securities issued by financial institutions and other entities constituted all of the available-for-sale investment securities classified as Level 3 valuations as of December 31, 2010 and 2009.

Real estate loans held for sale

The Company utilizes commitments to sell real estate loans to hedge the exposure to changes in fair value of real estate loans held for sale. The carrying value of hedged real estate loans held for sale includes changes in estimated fair value during the hedge period. Typically, the Company attempts to hedge real estate loans held for sale from the date of close through the sale date. The fair value of hedged real estate loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans with similar characteristics and, accordingly, such loans have been classified as a Level 2 valuation.

Commitments to originate real estate loans for sale and commitments to sell real estate loans

The Company enters into various commitments to originate real estate loans for sale and commitments to sell real estate loans. Such commitments are considered to be derivative financial instruments and, therefore, are carried at estimated fair value on the consolidated balance sheet. The estimated fair values of such commitments were generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans to certain government-sponsored entities and other parties. The fair valuations of commitments to sell real estate loans generally result in a Level 2 classification. The estimated fair value of commitments to originate real estate loans for sale are adjusted to reflect the Company’s anticipated commitment expirations. Estimated commitment expirations are considered a significant unobservable input, which results in a Level 3 classification. The Company includes the expected net future cash flows related to the associated servicing of the loan in the fair value measurement of a derivative loan commitment. The estimated value ascribed to the expected net future servicing cash flows is also considered a significant unobservable input contributing to the Level 3 classification of commitments to originate real estate loans for sale.

Interest rate swap agreements used for interest rate risk management

The Company utilizes interest rate swap agreements as part of the management of interest rate risk to modify the repricing characteristics of certain portions of its portfolios of earning assets and interest-bearing liabilities. The Company generally determines the fair value of its interest rate swap agreements using externally developed pricing models based on market observable inputs and therefore classifies such valuations as Level 2. The Company has considered counterparty credit risk in the valuation of its interest rate swap assets and has considered its own credit risk in the valuation of its interest rate swap liabilities.

The following tables present assets and liabilities at December 31, 2010 and December 31, 2009 measured at estimated fair value on a recurring basis:


	Fair Value
	Measurements at
	December 31,
	2010		Level 1(a)		Level 2(a)		Level 3
			(In thousands)

Trading account assets	$	523,834		53,032		470,802		—
Investment securities available for sale:
U.S. Treasury and federal agencies		63,434		—		63,434		—
Obligations of states and political subdivisions		60,425		—		60,425		—
Mortgage-backed securities:
Government issued or guaranteed		3,306,241		—		3,306,241		—
Privately issued residential		1,435,561		—		—		1,435,561
Privately issued commercial		22,407		—		—		22,407
Collateralized debt obligations		110,756		—		—		110,756
Other debt securities		298,900		—		298,900		—
Equity securities		115,768		106,872		8,896		—

		5,413,492		106,872		3,737,896		1,568,724

Real estate loans held for sale		544,567		—		544,567		—
Other assets(b)		114,666		—		111,839		2,827

Total assets	$	6,596,559		159,904		4,865,104		1,571,551

Trading account liabilities	$	333,222		—		333,222		—
Other liabilities(b)		3,607		—		3,024		583

Total liabilities	$	336,829		—		336,246		583


	Fair Value
	Measurements at
	December 31,
	2009		Level 1		Level 2		Level 3
			(In thousands)

Trading account assets	$	386,984		40,836		346,148		—
Investment securities available for sale:
U.S. Treasury and federal agencies		104,686		—		104,686		—
Obligations of states and political subdivisions		62,923		—		62,923		—
Mortgage-backed securities:
Government issued or guaranteed		3,902,282		—		3,902,282		—
Privately issued residential		2,064,904		—		—		2,064,904
Privately issued commercial		25,166		—		—		25,166
Collateralized debt obligations		115,346		—		—		115,346
Other debt securities		268,201		—		267,781		420
Equity securities		160,870		145,817		15,053		—

		6,704,378		145,817		4,352,725		2,205,836

Real estate loans held for sale		652,761		—		652,761		—
Other assets(b)		78,216		—		73,788		4,428

Total assets	$	7,822,339		186,653		5,425,422		2,210,264

Trading account liabilities	$	302,198		5,577		296,621		—
Other liabilities(b)		6,039		—		1,531		4,508

Total liabilities	$	308,237		5,577		298,152		4,508


(a)		There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the year ended December 31, 2010.

(b)		Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 3).

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the year ended December 31, 2010 were as follows:


																	Changes in
																	Unrealized Gains
				Total Gains (Losses)													(Losses) Included
				Realized/Unrealized													in Earnings Related
							Included in										to Assets Still
	Balance-						Other					Transfer in			Balance-		Held at
	January 1,			Included			Comprehensive					and/or out of			December 31,		December 31,
	2010			in Earnings			Income		Settlements			Level 3(c)			2010		2010
									(In thousands)

Investment securities available for sale:
Privately issued residential mortgage-backed securities	$	2,064,904			(63,503	)(a)		176,140		(386,732	)		(355,248	)(d)		1,435,561		(63,503	)(a)
Privately issued commercial mortgage-backed securities		25,166			—			5,462		(8,221	)		—			22,407		—
Collateralized debt obligations		115,346			(5,703	)(a)		2,887		(1,774	)		—			110,756		(5,703	)(a)
Other debt securities		420			—			35		—			(455	)		—		—

		2,205,836			(69,206	)		184,524		(396,727	)		(355,703	)		1,568,724		(69,206	)
Other assets and other liabilities		(80	)		95,661	(b)		—		—			(93,337	)		2,244		2,153	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the year ended December 31, 2009 were as follows:


																		Changes in
																		Unrealized Gains
			Total Gains (Losses)															(Losses) Included
			Realized/Unrealized															in Earnings Related
						Included in												to Assets Still
	Balance-					Other			Purchases, Sales,			Transfer in			Balance-			Held at
	January 1,		Included			Comprehensive			Issuances &			and/or out of			December 31,			December 31,
	2009		in Earnings			Income			Settlements			Level 3(c)			2009			2009
									(In thousands)

Investment securities available for sale:
U.S. Treasury and federal agencies	$	5,532		—			—			—			(5,532	)		—			—
Obligations of states and political subdivisions		38		—			224			(9	)		(253	)		—			—
Government issued or guaranteed mortgage-backed securities		84,544		—			—			—			(84,544	)		—			—
Privately issued residential mortgage-backed securities		2,326,554		(128,374	)(a)		421,150			(554,426	)		—			2,064,904			(128,374	)(a)
Privately issued commercial mortgage-backed securities		41,046		—			(6,853	)		(9,027	)		—			25,166			—
Collateralized debt obligations		2,496		(9,568	)(a)		19,770			102,648			—			115,346			(9,923	)(a)
Other debt securities		—		—			145			725			(450	)		420			—
Equity securities		2,302		—			2			(12	)		(2,292	)		—			—

		2,462,512		(137,942	)		434,438			(460,101	)		(93,071	)		2,205,836			(138,297	)
Other assets and other liabilities		8,266		34,400	(b)		—			—			(42,746	)		(80	)		2,465	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the year ended December 31, 2008 were as follows:


																	Changes in
																	Unrealized Gains
			Total Gains (Losses)														(Losses) Included
			Realized/Unrealized														in Earnings Related
						Included in											to Assets Still
	Balance-					Other			Purchases, Sales,			Transfer in			Balance-		Held at
	January 1,		Included			Comprehensive			Issuances &			and/or out of			December 31,		December 31,
	2008		in Earnings			Income			Settlements			Level 3			2008		2008
									(In thousands)

Investment securities available for sale:
U.S. Treasury and federal agencies	$	5,696		—			364			(528	)		—			5,532		—
Obligations of states and political subdivisions		50		—			(5	)		(7	)		—			38		—
Government issued or guaranteed mortgage-backed securities		118,992		—			878			(6,390	)		(28,936	)		84,544		—
Privately issued residential and commercial mortgage-backed securities		1,159,644		(12,483	)(a)		(408,211	)		(236,669	)		1,865,319			2,367,600		(12,483	)(a)
Collateralized debt obligations		27,115		(11,413	)(a)		(13,232	)		—			26			2,496		(11,413	)(a)
Equity securities		2,324		—			(9	)		(13	)		—			2,302		—

		1,313,821		(23,896	)		(420,215	)		(243,607	)		1,836,409			2,462,512		(23,896	)
Other assets and other liabilities		2,654		31,356	(b)		—			—			(25,744	)		8,266		8,266	(b)


(a)		Reported as an other-than-temporary impairment loss in the consolidated statement of income or as gain (loss) on bank investment securities.

(b)		Reported as mortgage banking revenues in the consolidated statement of income and includes the fair value of commitment issuances and expirations.

(c)		The Company’s policy for transfers between fair value levels is to recognize the transfer as of the actual date of the event or change in circumstances that caused the transfer.

(d)		As a result of the Company’s adoption of new accounting rules governing the consolidation of variable interest entities, effective January 1, 2010 the Company derecognized $355 million of available-for-sale investment securities previously classified as Level 3 measurements. Further information regarding the Company’s adoption of new accounting requirements is included in note 19.

The Company is required, on a nonrecurring basis, to adjust the carrying value of certain assets or provide valuation allowances related to certain assets using fair value measurements. The more significant of those assets follow.

Loans

Loans are generally not recorded at fair value on a recurring basis. Periodically, the Company records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral-dependent loans when establishing the allowance for credit losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated valuation amount does not necessarily represent the fair value of the loan. Real estate collateral is typically valued using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurement adjustments have generally been classified as Level 2, unless significant adjustments have been made to the valuation that are not readily observable by market participants. Estimates of fair value used for other collateral supporting commercial loans generally are based on assumptions not observable in the marketplace and therefore such valuations have been classified as Level 3. Loans subject to nonrecurring fair value measurement were $746 million at December 31, 2010, ($476 million and $270 million of which were classified as Level 2 and Level 3, respectively) and $901 million at December 31, 2009 ($547 million and $354 million of which were classified as Level 2 and Level 3, respectively). Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on December 31, 2010 were decreases of $224 million for the year ended December 31, 2010, and on loans held by the Company on December 31, 2009 were decreases of $343 million for the year ended December 31, 2009

Capitalized servicing rights

Capitalized servicing rights are initially measured at fair value in the Company’s consolidated balance sheet. The Company utilizes the amortization method to subsequently measure its capitalized servicing assets. In accordance with GAAP, the Company must record impairment charges, on a nonrecurring basis, when the carrying value of certain strata exceed their estimated fair value. To estimate the fair value of servicing rights, the Company considers market prices for similar assets, if available, and the present value of expected future cash flows associated with the servicing rights calculated using assumptions that market participants would use in estimating future servicing income and expense. Such assumptions include estimates of the cost of servicing loans, loan default rates, an appropriate discount rate, and prepayment speeds. For purposes of evaluating and measuring impairment of capitalized servicing rights, the Company stratifies such assets based on the predominant risk characteristics of the underlying financial instruments that are expected to have the most impact on projected prepayments, cost of servicing and other factors affecting future cash flows associated with the servicing rights. Such factors may include financial asset or loan type, note rate and term. The amount of impairment recognized is the amount by which the carrying value of the capitalized servicing rights for a stratum exceed estimated fair value. Impairment is recognized through a valuation allowance. The determination of fair value of capitalized servicing rights is considered a Level 3 valuation. There were no changes in the fair value of capitalized servicing rights recognized for the year ended December 31, 2010. At December 31, 2010 and

December 31, 2009, no stratum of capitalized servicing rights had a carrying value equal to its fair value. Changes in fair value of capitalized servicing rights recognized for the year ended December 31, 2009 reflected increases in fair value of $22 million.

Assets taken in foreclosure of defaulted loans

Assets taken in foreclosure of defaulted loans are primarily comprised of commercial and residential real property and are generally measured at the lower of cost or fair value less costs to sell. The fair value of the real property is generally determined using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace, and the related nonrecurring fair value measurement adjustments have generally been classified as Level 2. Assets taken in foreclosure of defaulted loans subject to nonrecurring fair value measurement were $176 million and $43 million at December 31, 2010 and December 31, 2009, respectively. Changes in fair value recognized for those foreclosed assets held by the Company at December 31, 2010 were $37 million for the year ended December 31, 2010. Changes in fair value recognized for those foreclosed assets held by the Company at December 31, 2009 were $24 million for the year ended December 31, 2009.

Disclosures of fair value of financial instruments

With the exception of marketable securities, certain off-balance sheet financial instruments and one-to-four family residential mortgage loans originated for sale, the Company’s financial instruments are not readily marketable and market prices do not exist. The Company, in attempting to comply with the provisions of GAAP that require disclosures of fair value of financial instruments, has not attempted to market its financial instruments to potential buyers, if any exist. Since negotiated prices in illiquid markets depend greatly upon the then present motivations of the buyer and seller, it is reasonable to assume that actual sales prices could vary widely from any estimate of fair value made without the benefit of negotiations. Additionally, changes in market interest rates can dramatically impact the value of financial instruments in a short period of time. Additional information about the assumptions and calculations utilized follows.

The carrying amounts and estimated fair value for financial instrument assets (liabilities) are presented in the following table:


	December 31, 2010						December 31, 2009
	Carrying			Calculated			Carrying			Calculated
	Amount			Estimate			Amount			Estimate
				(In thousands)

Financial assets:
Cash and cash equivalents	$	933,755		$	933,755		$	1,246,342		$	1,246,342
Interest-bearing deposits at banks		101,222			101,222			133,335			133,335
Trading account assets		523,834			523,834			386,984			386,984
Investment securities		7,150,540			7,051,454			7,780,609			7,629,485
Loans and leases:
Commercial loans and leases		13,390,610			13,135,569			13,479,447			13,090,206
Commercial real estate loans		21,183,161			20,840,346			20,949,931			20,426,273
Residential real estate loans		5,928,056			5,699,028			5,463,463			5,058,763
Consumer loans		11,488,555			11,178,583			12,043,845			11,575,525
Allowance for credit losses		(902,941	)		—			(878,022	)		—

Loans and leases, net		51,087,441			50,853,526			51,058,664			50,150,767
Accrued interest receivable		202,182			202,182			214,692			214,692
Financial liabilities:
Noninterest-bearing deposits	$	(14,557,568	)	$	(14,557,568	)	$	(13,794,636	)	$	(13,794,636	)
Savings deposits and NOW accounts		(27,824,630	)		(27,824,630	)		(25,073,269	)		(25,073,269	)
Time deposits		(5,817,170	)		(5,865,779	)		(7,531,495	)		(7,592,214	)
Deposits at Cayman Islands office		(1,605,916	)		(1,605,916	)		(1,050,438	)		(1,050,438	)
Short-term borrowings		(947,432	)		(947,432	)		(2,442,582	)		(2,442,582	)
Long-term borrowings		(7,840,151	)		(7,937,397	)		(10,240,016	)		(9,822,153	)
Accrued interest payable		(71,954	)		(71,954	)		(94,838	)		(94,838	)
Trading account liabilities		(333,222	)		(333,222	)		(302,198	)		(302,198	)
Other financial instruments:
Commitments to originate real estate loans for sale	$	2,244		$	2,244		$	(80	)	$	(80	)
Commitments to sell real estate loans		12,178			12,178			17,771			17,771
Other credit-related commitments		(74,426	)		(74,426	)		(55,954	)		(55,954	)
Interest rate swap agreements used for interest rate risk management		96,637			96,637			54,486			54,486

The following assumptions, methods and calculations were used in determining the estimated fair value of financial instruments not measured at fair value in the consolidated balance sheet.

Cash and cash equivalents, interest-bearing deposits at banks, short-term borrowings, accrued interest receivable and accrued interest payable

Due to the nature of cash and cash equivalents and the near maturity of interest-bearing deposits at banks, short-term borrowings, accrued interest receivable and accrued interest payable, the Company estimated that the carrying amount of such instruments approximated estimated fair value.

Investment securities

Estimated fair values of investments in readily marketable securities were generally based on quoted market prices. Investment securities that were not readily marketable were assigned amounts based on estimates provided by outside parties or modeling techniques that relied upon discounted calculations of projected cash flows or, in the case of other investment securities, which include capital stock of the Federal Reserve Bank of New York and the Federal Home Loan Bank of New York, at an amount equal to the carrying amount.

Loans and leases

In general, discount rates used to calculate values for loan products were based on the Company’s pricing at the respective period end. A higher discount rate was assumed with respect to estimated cash flows associated with nonaccrual loans. Projected loan cash flows were adjusted for estimated credit losses. However, such estimates made by the Company may not be indicative of assumptions and adjustments that a purchaser of the Company’s loans and leases would seek.

Deposits

Pursuant to GAAP, the estimated fair value ascribed to noninterest-bearing deposits, savings deposits and NOW accounts must be established at carrying value because of the customers’ ability to withdraw funds immediately. Time deposit accounts are required to be revalued based upon prevailing market interest rates for similar maturity instruments. As a result, amounts assigned to time deposits were based on discounted cash flow calculations using prevailing market interest rates based on the Company’s pricing at the respective date for deposits with comparable remaining terms to maturity.

The Company believes that deposit accounts have a value greater than that prescribed by GAAP. The Company feels, however, that the value associated with these deposits is greatly influenced by characteristics of the buyer, such as the ability to reduce the costs of servicing the deposits and deposit attrition which often occurs following an acquisition.

Long-term borrowings

The amounts assigned to long-term borrowings were based on quoted market prices, when available, or were based on discounted cash flow calculations using prevailing market interest rates for borrowings of similar terms and credit risk.

Commitments to originate real estate loans for sale and commitments to sell real estate loans

Interest rate swap agreements used for interest rate risk management

The estimated fair value of interest rate swap agreements used for interest rate risk management represents the amount the Company would have expected to receive or pay to terminate such agreements.

Other commitments and contingencies

As described in note 21, in the normal course of business, various commitments and contingent liabilities are outstanding, such as loan commitments, credit guarantees and letters of credit. The Company’s pricing of such financial instruments is based largely on credit quality and relationship, probability of funding and other requirements. Loan commitments often have fixed expiration dates and contain termination and other clauses which provide for relief from funding in the event of significant deterioration in the credit quality of the customer. The rates and terms of the Company’s loan commitments, credit guarantees and letters of credit are competitive with other financial institutions operating in markets served by the Company. The Company believes that the carrying amounts, which are included in other liabilities, are reasonable estimates of the fair value of these financial instruments.

The Company does not believe that the estimated information presented herein is representative of the earnings power or value of the Company. The preceding analysis, which is inherently limited in depicting fair value, also does not consider any value associated with existing customer relationships nor the ability of the Company to create value through loan origination, deposit gathering or fee generating activities.

Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different.

Commitments and contingencies

12 Months Ended

Dec. 31, 2010

Commitments and contingencies [Abstract]

Commitments and contingencies


21.	Commitments and contingencies

In the normal course of business, various commitments and contingent liabilities are outstanding. The following table presents the Company’s significant commitments. Certain of these commitments are not included in the Company’s consolidated balance sheet.


	December 31
	2010		2009
	(In thousands)

Commitments to extend credit
Home equity lines of credit	$	6,281,366	$	6,482,987
Commercial real estate loans to be sold		72,930		180,498
Other commercial real estate and construction		1,672,006		1,360,805
Residential real estate loans to be sold		161,583		631,090
Other residential real estate		151,111		127,788
Commercial and other		8,332,199		7,155,188
Standby letters of credit		3,917,318		3,828,586
Commercial letters of credit		76,962		66,377
Financial guarantees and indemnification contracts		1,609,944		1,633,549
Commitments to sell real estate loans		734,696		1,239,001

Commitments to extend credit are agreements to lend to customers, generally having fixed expiration dates or other termination clauses that may require payment of a fee. Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, whereas commercial letters of credit are issued to facilitate commerce and typically result in the commitment being funded when the underlying transaction is consummated between the customer and third party. The credit risk associated with commitments to extend credit and standby and commercial letters of credit is essentially the same as that involved with extending loans to customers and is subject to normal credit policies. Collateral may be obtained based on management’s assessment of the customer’s creditworthiness.

Financial guarantees and indemnification contracts are oftentimes similar to standby letters of credit and include mandatory purchase agreements issued to ensure that customer obligations are fulfilled, recourse obligations associated with sold loans, and other guarantees of customer performance or compliance with designated rules and regulations. Included in financial guarantees and indemnification contracts are loan principal amounts sold with recourse in conjunction with the Company’s involvement in the Fannie Mae DUS program. The Company’s maximum credit risk for recourse associated with loans sold under this program totaled approximately $1.6 billion and $1.3 billion at December 31, 2010 and 2009, respectively.

Since many loan commitments, standby letters of credit, and guarantees and indemnification contracts expire without being funded in whole or in part, the contract amounts are not necessarily indicative of future cash flows.

The Company utilizes commitments to sell real estate loans to hedge exposure to changes in the fair value of real estate loans held for sale. Such commitments are considered derivatives and along with commitments to originate real estate loans to be held for sale are generally recorded in the consolidated balance sheet at estimated fair market value.

The Company occupies certain banking offices and uses certain equipment under noncancellable operating lease agreements expiring at various dates over the next 29 years. Minimum lease payments under noncancellable operating leases are summarized in the following table:


	(In thousands)

Year ending December 31:
2011	$	78,325
2012		75,033
2013		60,712
2014		50,493
2015		42,741
Later years		137,592

	$	444,896

The Company has an agreement with the Baltimore Ravens of the National Football League whereby the Company obtained the naming rights to a football stadium in Baltimore, Maryland. Under the agreement, the Company is obligated to pay $5 million per year through 2013 and $6 million per year from 2014 through 2017.

The Company reinsures credit life and accident and health insurance purchased by consumer loan customers. The Company also enters into reinsurance contracts with third party insurance companies who insure against the risk of a mortgage borrower’s payment default in connection with certain mortgage loans originated by the Company. When providing reinsurance coverage, the Company receives a premium in exchange for accepting a portion of the insurer’s risk of loss. The outstanding loan principal balances reinsured by the Company were approximately $85 million at December 31, 2010. Assets of subsidiaries providing reinsurance that are available to satisfy claims totaled approximately $71 million at December 31, 2010. The amounts noted above are not necessarily indicative of losses which may ultimately be incurred. Such losses are expected to be substantially less because most loans are repaid by borrowers in accordance with the original loan terms. Management believes that any reinsurance losses that may be payable by the Company will not be material to the Company’s consolidated financial position.

The Company is contractually obligated to repurchase previously sold residential real estate loans that do not ultimately meet investor sale criteria related to underwriting procedures or loan documentation. When required to do so, the Company may reimburse loan purchasers for losses incurred or may repurchase certain loans. The Company reduces residential mortgage banking revenues by an estimate for losses related to its obligations to loan purchasers. The amount of those charges is based on the volume of loans sold, the level of reimbursement requests received from loan purchasers and estimates of losses that may be associated with previously sold loans. At December 31, 2010, management believes that any remaining liability arising out of the Company’s obligation to loan purchasers is not material to the Company’s consolidated financial position.

M&T and its subsidiaries are subject in the normal course of business to various pending and threatened legal proceedings in which claims for monetary damages are asserted. Management, after consultation with legal counsel, does not anticipate that the aggregate ultimate liability arising out of litigation pending against M&T or its subsidiaries will be material to the Company’s consolidated financial position, but at the present time is not in a position to determine whether such litigation will have a material adverse effect on the Company’s consolidated results of operations in any future reporting period.

Segment information

12 Months Ended

Dec. 31, 2010

Segment information [Abstract]

Segment information


22.	Segment information

Reportable segments have been determined based upon the Company’s internal profitability reporting system, which is organized by strategic business unit. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer and the distribution of those products and services are similar. The reportable segments are Business Banking, Commercial Banking, Commercial Real Estate, Discretionary Portfolio, Residential Mortgage Banking and Retail Banking.

The financial information of the Company’s segments has been compiled utilizing the accounting policies described in note 1 with certain exceptions. The more significant of these exceptions are described herein. The Company allocates interest income or interest expense using a methodology that charges users of funds (assets) interest expense and credits providers of funds (liabilities) with income based on the maturity, prepayment and/or repricing characteristics of the assets and liabilities. The net effect of this allocation is recorded in the “All Other” category. A provision for credit losses is allocated to segments in an amount based largely on actual net charge-offs incurred by the segment during the period plus or minus an amount necessary to adjust the segment’s allowance for credit losses due to changes in loan balances. In contrast, the level of the consolidated provision for credit losses is determined using the methodologies described in note 1 to assess the overall adequacy of the allowance for credit losses. Indirect fixed and variable expenses incurred by certain centralized support areas are allocated to segments based on actual usage (for example, volume measurements) and other criteria. Certain types of administrative expenses and bankwide expense accruals (including amortization of core deposit and other intangible assets associated with acquisitions of financial institutions) are generally not allocated to segments. Income taxes are allocated to segments based on the Company’s marginal statutory tax rate adjusted for any tax-exempt income or non-deductible expenses. Equity is allocated to the segments based on regulatory capital requirements and in proportion to an assessment of the inherent risks associated with the business of the segment (including interest, credit and operating risk).

The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to GAAP. As a result, reported segment results are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in reported segment financial data. Information about the Company’s segments is presented in the accompanying table. Income statement amounts are in thousands of dollars. Balance sheet amounts are in millions of dollars.


							For the Years Ended December 31, 2010, 2009 and 2008
	Business Banking						Commercial Banking						Commercial Real Estate						Discretionary Portfolio
	2010		2009		2008		2010		2009		2008		2010		2009		2008		2010			2009			2008

Net interest income(a)	$	315,407	$	321,208	$	288,519	$	582,231	$	531,592	$	433,238	$	384,147	$	346,513	$	287,727	$	23,347		$	137,507		$	144,856
Noninterest income		95,443		89,043		86,293		217,368		192,979		197,515		85,200		65,224		63,288		(34,383	)		(100,507	)		(140,063	)

		410,850		410,251		374,812		799,599		724,571		630,753		469,347		411,737		351,015		(11,036	)		37,000			4,793
Provision for credit losses		74,443		41,923		33,529		47,675		107,871		77,104		45,781		84,614		15,507		55,810			83,139			68,766
Amortization of core deposit and other intangible assets		—		—		—		—		—		—		—		—		—		—			—			—
Depreciation and other amortization		276		857		757		552		628		559		7,339		5,934		4,588		3,733			5,506			5,342
Other noninterest expense		169,878		158,042		137,780		219,471		210,180		191,785		124,674		103,124		89,151		26,256			27,070			45,892

Income (loss) before taxes		166,253		209,429		202,746		531,901		405,892		361,305		291,553		218,065		241,769		(96,835	)		(78,715	)		(115,207	)
Income tax expense (benefit)		67,687		85,387		82,686		217,734		166,459		148,136		88,466		62,711		77,478		(58,269	)		(50,692	)		(67,142	)

Net income (loss)	$	98,566	$	124,042	$	120,060	$	314,167	$	239,433	$	213,169	$	203,087	$	155,354	$	164,291	$	(38,566	)	$	(28,023	)	$	(48,065	)

Average total assets (in millions)	$	4,843	$	4,869	$	4,452	$	15,461	$	15,399	$	14,981	$	13,194	$	12,842	$	11,394	$	14,690		$	13,763		$	14,179

Capital expenditures (in millions)	$	1	$	1	$	2	$	3	$	—	$	1	$	1	$	1	$	—	$	—		$	—		$	—


	For the Years Ended December 31, 2010, 2009 and 2008
	Residential Mortgage Banking								Retail Banking						All Other									Total
	2010		2009			2008			2010		2009		2008		2010			2009			2008			2010		2009		2008

Net interest income(a)	$	71,599	$	78,865		$	66,051		$	839,828	$	878,520	$	830,022	$	50,967		$	(238,457	)	$	(110,617	)	$	2,267,526	$	2,055,748	$	1,939,796
Noninterest income		195,540		226,659			171,774			380,015		372,821		343,666		168,917			201,887			216,506			1,108,100		1,048,106		938,979

		267,139		305,524			237,825			1,219,843		1,251,341		1,173,688		219,884			(36,570	)		105,889			3,375,626		3,103,854		2,878,775
Provision for credit losses		49,110		97,816			104,995			109,978		130,509		98,586		(14,797	)		58,128			13,513			368,000		604,000		412,000
Amortization of core deposit and other intangible assets		—		—			—			—		—		—		58,103			64,255			66,646			58,103		64,255		66,646
Depreciation and other amortization		46,171		51,552			56,666			31,350		31,299		28,523		34,838			30,890			22,709			124,259		126,666		119,144
Other noninterest expense		160,131		185,829			164,102			698,540		689,314		624,834		333,525			416,083			287,662			1,732,475		1,789,642		1,541,206

Income (loss) before taxes		11,727		(29,673	)		(87,938	)		379,975		400,219		421,745		(191,785	)		(605,926	)		(284,641	)		1,092,789		519,291		739,779
Income tax expense (benefit)		587		(16,629	)		(39,758	)		154,680		162,957		171,740		(114,257	)		(270,793	)		(189,248	)		356,628		139,400		183,892

Net income (loss)	$	11,140	$	(13,044	)	$	(48,180	)	$	225,295	$	237,262	$	250,005	$	(77,528	)	$	(335,133	)	$	(95,393	)	$	736,161	$	379,891	$	555,887

Average total assets (in millions)	$	2,217	$	2,552		$	2,660		$	12,079	$	12,024	$	11,356	$	5,896		$	6,023		$	6,110		$	68,380	$	67,472	$	65,132

Capital expenditures (in millions)	$	1	$	—		$	—		$	33	$	39	$	38	$	31		$	18		$	31		$	70	$	59	$	72


(a)		Net interest income is the difference between actual taxable-equivalent interest earned on assets and interest paid on liabilities by a segment and a funding charge (credit) based on the Company’s internal funds transfer pricing methodology. Segments are charged a cost to fund any assets (e.g. loans) and are paid a funding credit for any funds provided (e.g. deposits). The taxable-equivalent adjustment aggregated $24,023,000 in 2010, $21,829,000 in 2009 and $21,861,000 in 2008 and is eliminated in “All Other” net interest income and income tax expense (benefit).

The Business Banking segment provides deposit, lending, cash management and other financial services to small businesses and professionals through the Company’s banking office network and several other delivery channels, including business banking centers, telephone banking, Internet banking and automated teller machines. The Commercial Banking segment provides a wide range of credit products and banking services to middle-market and large commercial customers, mainly within the markets the Company serves. Among the services provided by this segment are commercial lending and leasing, letters of credit, deposit products and cash management services. The Commercial Real Estate segment provides credit services which are secured by various types of multifamily residential and commercial real estate and deposit services to its customers. Activities of this segment include the origination, sales and servicing of commercial real estate loans. The Discretionary Portfolio segment includes securities, residential mortgage loans and other assets; short-term and long-term borrowed funds; brokered certificates of deposit and interest rate swap agreements related thereto; and Cayman Islands branch deposits. This segment also provides foreign exchange services to customers. The Residential Mortgage Banking segment originates and services residential mortgage loans for consumers and sells substantially all of those loans in the secondary market to investors or to the Discretionary Portfolio segment. The segment periodically purchases servicing rights to loans that have been originated by other entities. This segment also originated loans to developers of residential real estate properties. Residential mortgage loans held for sale are included in the Residential Mortgage Banking segment. The Retail Banking segment offers a variety of services to consumers through several delivery channels that include banking offices, automated teller machines, telephone banking and Internet banking. The “All Other” category includes other operating activities of the Company that are not directly attributable to the reported segments; the difference between the provision for credit losses and the calculated provision allocated to the reportable segments; goodwill and core deposit and other intangible assets resulting from acquisitions of financial institutions; merger-related gains and expenses resulting from acquisitions; the net impact of the Company’s internal funds transfer pricing methodology; eliminations of transactions between reportable segments; certain nonrecurring transactions; the residual effects of unallocated support systems and general and administrative expenses; and the impact of interest rate risk management strategies. The amount of intersegment activity eliminated in arriving at consolidated totals was included in the “All Other” category as follows:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Revenues	$	(41,508	)	$	(47,114	)	$	(42,738	)
Expenses		(15,527	)		(19,164	)		(19,198	)
Income taxes (benefit)		(10,572	)		(11,373	)		(9,578	)
Net income (loss)		(15,409	)		(16,577	)		(13,962	)

The Company conducts substantially all of its operations in the United States. There are no transactions with a single customer that in the aggregate result in revenues that exceed ten percent of consolidated total revenues.

Regulatory Matters

12 Months Ended

Dec. 31, 2010

Regulatory Matters [Abstract]

Regulatory matters


23.	Regulatory matters

Payment of dividends by M&T’s banking subsidiaries is restricted by various legal and regulatory limitations. Dividends from any banking subsidiary to M&T are limited by the amount of earnings of the banking subsidiary in the current year and the preceding two years. For purposes of this test, at December 31, 2010, approximately $1.4 billion was available for payment of dividends to M&T from banking subsidiaries.

Banking regulations prohibit extensions of credit by the subsidiary banks to M&T unless appropriately secured by assets. Securities of affiliates are not eligible as collateral for this purpose.

The bank subsidiaries are required to maintain noninterest-earning reserves against certain deposit liabilities. During the maintenance periods that included December 31, 2010 and 2009, cash and due from banks included a daily average of $196,402,000 and $162,952,000, respectively, for such purpose.

Federal regulators have adopted capital adequacy guidelines for bank holding companies and banks. Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a material effect on the Company’s financial statements. Under the capital adequacy guidelines, the so-called “Tier 1 capital” and “Total capital” as a percentage of risk-weighted assets and certain off-balance sheet financial instruments must be at least 4% and 8%, respectively. In addition to these risk-based measures, regulators also require banking institutions that meet certain qualitative criteria to maintain a minimum “leverage” ratio of “Tier 1 capital” to average total assets, adjusted for goodwill and certain other items, of at least 3% to be considered adequately capitalized. As of December 31, 2010, M&T and each of its banking subsidiaries exceeded all applicable capital adequacy requirements. To be considered “well capitalized,” under the regulatory framework for prompt corrective action, a banking institution must maintain Tier 1 risk-based capital, total risk-based capital and leverage ratios of at least 6%, 10% and 5%, respectively.

The capital ratios and amounts of the Company and its banking subsidiaries as of December 31, 2010 and 2009 are presented below:


	M&T						M&T
	(Consolidated)			M&T Bank			Bank, N.A.
	(Dollars in thousands)

December 31, 2010:
Tier 1 capital
Amount	$	6,051,724		$	5,406,330		$	190,151
Ratio(a)		9.47	%		8.62	%		26.80	%
Minimum required amount(b)		2,555,215			2,508,897			28,386
Total capital
Amount		8,352,643			7,686,799			196,140
Ratio(a)		13.08	%		12.26	%		27.64	%
Minimum required amount(b)		5,110,431			5,017,795			56,772
Leverage
Amount		6,051,724			5,406,330			190,151
Ratio(c)		9.33	%		8.46	%		22.54	%
Minimum required amount(b)		1,946,312			1,916,033			25,307
December 31, 2009:
Tier 1 capital
Amount	$	5,514,093		$	4,988,224		$	188,769
Ratio(a)		8.59	%		7.96	%		18.49	%
Minimum required amount(b)		2,567,323			2,507,700			40,846
Total capital
Amount		7,892,455			7,342,191			193,591
Ratio(a)		12.30	%		11.71	%		18.96	%
Minimum required amount(b)		5,134,646			5,015,399			81,692
Leverage
Amount		5,514,093			4,988,224			188,769
Ratio(c)		8.43	%		7.77	%		19.41	%
Minimum required amount(b)		1,961,213			1,925,558			29,179


(a)		The ratio of capital to risk-weighted assets, as defined by regulation.
(b)		Minimum amount of capital to be considered adequately capitalized, as defined by regulation.
(c)		The ratio of capital to average assets, as defined by regulation.

Relationship of M&T and AIB

12 Months Ended

Dec. 31, 2010

Relationship of M&T and AIB [Abstract]

Relationship of M&T and AIB


24.	Relationship of M&T and AIB

AIB received 26,700,000 shares of M&T common stock on April 1, 2003 as a result of M&T’s acquisition of a subsidiary of AIB on that date. In an effort to raise its capital position to meet new Irish government-mandated capital requirements, AIB sold those shares on November 4, 2010 and, as a result, the provisions of the Agreement and Plan of Reorganization between M&T and AIB related to AIB’s rights as a substantial shareholder in the corporate governance of M&T became inoperative as of that date.

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.

12 Months Ended

Dec. 31, 2010

Relationship With Other Entities [Abstract]

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.


25.	Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.

In 2007, M&T invested $300 million to acquire a 20% minority interest in Bayview Lending Group LLC (“BLG”), a privately-held commercial mortgage lender. M&T recognizes income or loss from BLG using the equity method of accounting. The carrying value of that investment was $220 million at December 31, 2010.

Bayview Financial Holdings, L.P. (together with its affiliates, “Bayview Financial”), a privately-held specialty mortgage finance company, is BLG’s majority investor. In addition to their common investment in BLG, the Company and Bayview Financial conduct other business activities with each other. The Company has purchased loan servicing rights for small-balance commercial mortgage loans from BLG and Bayview Financial having outstanding principal balances of $5.2 billion and $5.5 billion at December 31, 2010 and 2009, respectively. Amounts recorded as capitalized servicing assets for such loans totaled $26 million at December 31, 2010 and $40 million at December 31, 2009. Capitalized servicing rights at December 31, 2010 and 2009 also included $9 million and $17 million, respectively, for servicing rights that were purchased from Bayview Financial related to residential mortgage loans with outstanding principal balances of $3.6 billion and $4.1 billion at December 31, 2010 and 2009, respectively. Revenues from servicing residential and small-balance commercial mortgage loans purchased from BLG and Bayview Financial were $46 million, $50 million and $54 million during 2010, 2009 and 2008, respectively. M&T Bank provided $34 million of credit facilities to Bayview Financial at December 31, 2009, of which $24 million was outstanding at that date. That credit facility expired and was repaid in full during 2010. There was no similar credit facility provided as of December 31, 2010. The Company held $22 million and $25 million at December 31, 2010 and 2009, respectively, of collateralized mortgage obligations in its available-for-sale investment securities portfolio that were securitized by Bayview Financial. In addition, the Company held $313 million and $352 million of similar investment securities in its held-to-maturity portfolio at December 31, 2010 and December 31, 2009, respectively.

Parent company financial statements

12 Months Ended

Dec. 31, 2010

Parent company financial statements [Abstract]

Parent company financial statements


26.	Parent company financial statements

Condensed Balance Sheet


	December 31
	2010		2009
	(In thousands)

Assets
Cash in subsidiary bank	$	1,784	$	1,455
Due from consolidated bank subsidiaries
Money-market savings		481,340		327,029
Current income tax receivable		2,664		5,037
Other		—		55

Total due from consolidated bank subsidiaries		484,004		332,121
Investments in consolidated subsidiaries
Banks		9,048,703		8,559,692
Other		30,978		29,925
Investments in unconsolidated subsidiaries (note 19)		34,257		34,424
Investment in Bayview Lending Group LLC		219,800		245,568
Other assets		88,976		93,506

Total assets	$	9,908,502	$	9,296,691


Liabilities
Due to consolidated bank subsidiaries	$	20	$	—
Accrued expenses and other liabilities		73,283		68,004
Long-term borrowings		1,477,504		1,475,780

Total liabilities		1,550,807		1,543,784
Shareholders’ equity		8,357,695		7,752,907

Total liabilities and shareholders’ equity	$	9,908,502	$	9,296,691

Condensed Statement of Income


	Year Ended December 31
	2010			2009			2008
	(In thousands, except per share)

Income
Dividends from consolidated bank subsidiaries	$	500,000		$	—		$	—
Equity in earnings of Bayview Lending Group LLC		(25,768	)		(25,898	)		(37,453	)
Other-than-temporary impairment losses		(11,993	)		—			—
Other income		6,558			10,670			2,985

Total income		468,797			(15,228	)		(34,468	)

Expense
Interest on long-term borrowings		91,073			93,331			101,534
Other expense		7,447			5,427			2,798

Total expense		98,520			98,758			104,332

Income (loss) before income taxes and equity in undistributed income of subsidiaries		370,277			(113,986	)		(138,800	)
Income tax credits		48,416			42,740			51,085

Income (loss) before equity in undistributed income of subsidiaries		418,693			(71,246	)		(87,715	)

Equity in undistributed income of subsidiaries
Net income of subsidiaries		817,468			451,137			643,602
Less: dividends received		(500,000	)		—			—

Equity in undistributed income of subsidiaries		317,468			451,137			643,602

Net income	$	736,161		$	379,891		$	555,887

Net income per common share
Basic	$	5.72		$	2.90		$	5.04
Diluted		5.69			2.89			5.01

Condensed Statement of Cash Flows


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Cash flows from operating activities
Net income	$	736,161		$	379,891		$	555,887
Adjustments to reconcile net income to net cash provided by operating activities
Equity in undistributed income of subsidiaries		(317,468	)		(451,137	)		(643,602	)
Provision for deferred income taxes		2,237			291			16,653
Net change in accrued income and expense		43,567			14,589			46,884

Net cash provided (used) by operating activities		464,497			(56,366	)		(24,178	)

Cash flows from investing activities
Proceeds from sales of investment securities		2,591			—			15,808
Proceeds from maturities of investment securities		1,150			6,600			17,120
Purchases of investment securities		(2,225	)		(1,855	)		(43,072	)
Investment in subsidiary		—			(120,000	)		—
Proceeds from repayment of advances to subsidiaries		—			200,000			—
Other, net		1,033			15,088			(8,790	)

Net cash provided (used) by investing activities		2,549			99,833			(18,934	)

Cash flows from financing activities
Proceeds from long-term borrowings		—			—			350,010
Payments on long-term borrowings		—			(111,046	)		(20,661	)
Dividends paid — common		(335,303	)		(325,706	)		(308,501	)
Dividends paid — preferred		(40,225	)		(31,946	)		—
Proceeds from subsidiary for issuance of common stock to defined benefit pension plan		—			44,289			—
Proceeds from issuance of preferred stock and warrants		—			—			600,000
Other, net		63,122			12,255			13,184

Net cash provided (used) by financing activities		(312,406	)		(412,154	)		634,032

Net increase (decrease) in cash and cash equivalents		154,640			(368,687	)		590,920
Cash and cash equivalents at beginning of year		328,484			697,171			106,251

Cash and cash equivalents at end of year	$	483,124		$	328,484		$	697,171

Supplemental disclosure of cash flow information
Interest received during the year	$	1,581		$	4,960		$	15,311
Interest paid during the year		87,456			92,247			99,209
Income taxes received during the year		50,882			45,745			62,501

Significant Accounting Policies (Ploicies)	12 Months Ended
Significant Accounting Policies (Ploicies)	Dec. 31, 2010
Significant Accounting Policies (Policies) [Abstract]
Consolidation	*Consolidation* The consolidated financial statements include M&T and all of its subsidiaries. All significant intercompany accounts and transactions of consolidated subsidiaries have been eliminated in consolidation. The financial statements of M&T included in note 26 report investments in subsidiaries under the equity method. Information about some limited purpose entities that are affiliates of the Company but are not included in the consolidated financial statements appears in note 19.
Consolidated Statement of Cash Flows	*Consolidated Statement of Cash Flows* For purposes of this statement, cash and due from banks and federal funds sold are considered cash and cash equivalents.
Securities purchased under agreements to resell and securities sold under agreements to repurchase	*Securities purchased under agreements to resell and securities sold under agreements to repurchase*
Trading account	Securities purchased under agreements to resell and securities sold under agreements to repurchase are treated as collateralized financing transactions and are recorded at amounts equal to the cash or other consideration exchanged. It is generally the Company’s policy to take possession of collateral pledged to secure agreements to resell. *Trading account* Financial instruments used for trading purposes are stated at fair value. Realized gains and losses and unrealized changes in fair value of financial instruments utilized in trading activities are included in “trading account and foreign exchange gains” in the consolidated statement of income.
Investment securities	*Investment securities* Investments in debt securities are classified as held to maturity and stated at amortized cost when management has the positive intent and ability to hold such securities to maturity. Investments in other debt securities and equity securities having readily determinable fair values are classified as available for sale and stated at estimated fair value. Amortization of premiums and accretion of discounts for investment securities available for sale and held to maturity are included in interest income. Except for investment securities for which the Company has entered into a related fair value hedge, unrealized gains or losses on investment securities available for sale are reflected in accumulated other comprehensive income (loss), net of applicable income taxes. Other securities are stated at cost and include stock of the Federal Reserve Bank of New York and the Federal Home Loan Bank (“FHLB”) of New York. The cost basis of individual securities is written down through a charge to earnings when declines in value below amortized cost are considered to be other than temporary. In cases where fair value is less than amortized cost and the Company intends to sell a debt security, it is more likely than not to be required to sell a debt security before recovery of its amortized cost basis, or the Company does not expect to recover the entire amortized cost basis of a debt security, an other-than-temporary impairment is considered to have occurred. If the Company intends to sell the debt security or more likely than not will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary impairment is recognized in earnings equal to the entire difference between the debt security’s amortized cost basis and its fair value at the balance sheet date. If the Company does not expect to recover the entire amortized cost basis of the security, the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary impairment is separated into (a) the amount representing the credit loss and (b) the amount related to all other factors. The amount of the other-than-temporary impairment related to the credit loss is recognized in earnings while the amount related to other factors is recognized in other comprehensive income, net of applicable taxes. Subsequently, the Company accounts for the other-than-temporarily impaired debt security as if the security had been purchased on the measurement date of the other-than-temporary impairment at an amortized cost basis equal to the previous amortized cost basis less the other-than-temporary impairment recognized in earnings. The cost basis of individual equity securities is written down to estimated fair value through a charge to earnings when declines in value below cost are considered to be other than temporary. Realized gains and losses on the sales of investment securities are determined using the specific identification method.
Loans and leases	*Loans and leases* Interest income on loans is accrued on a level yield method. Loans are placed on nonaccrual status and previously accrued interest thereon is charged against income when principal or interest is delinquent 90 days, unless management determines that the loan status clearly warrants other treatment. Loan balances are charged off when it becomes evident that such balances are not fully collectible. For loans secured by residential real estate, the excess of the loan balances over the net realizable value of the property collateralizing the loan is charged-off when the loan becomes 150 days delinquent. Loan fees and certain direct loan origination costs are deferred and recognized as an interest yield adjustment over the life of the loan. Net deferred fees have been included in unearned discount as a reduction of loans outstanding. Commitments to sell real estate loans are utilized by the Company to hedge the exposure to changes in fair value of real estate loans held for sale. The carrying value of hedged real estate loans held for sale recorded in the consolidated balance sheet includes changes in estimated fair market value during the hedge period, typically from the date of close through the sale date. Valuation adjustments made on these loans and commitments are included in “mortgage banking revenues.” Except for consumer and residential mortgage loans that are considered smaller balance homogenous loans and are evaluated collectively and purchased-impaired loans, the Company considers a loan to be impaired for purposes of applying GAAP when, based on current information and events, it is probable that the Company will be unable to collect all amounts according to the contractual terms of the loan agreement or the loan is delinquent 90 days. Purchased-impaired loans are considered impaired under GAAP when it is probable that the Company will be unable to collect all cash flows expected at acquisition plus additional cash flows expected to be collected arising from changes in estimates after acquisition. Regardless of loan type, the Company considers a loan to be impaired if it qualifies as a troubled debt restructuring. Impaired loans are classified as either nonaccrual or as loans renegotiated at below market rates, with the exception of purchased-impaired loans which continue to accrete income in accordance with GAAP. Certain loans greater than 90 days delinquent are not considered impaired if they are both well-secured and in the process of collection. Loans less than 90 days delinquent are deemed to have an insignificant delay in payment and are generally not considered impaired. Impairment of a loan is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the fair value of collateral if the loan is collateral-dependent. Interest received on impaired loans placed on nonaccrual status is generally applied to reduce the carrying value of the loan or, if principal is considered fully collectible, recognized as interest income. Due to changes in GAAP for loans acquired in a business combination subsequent to December 31, 2008, the excess of cash flows expected at acquisition over the estimated fair value is recognized as interest income over the remaining lives of the loans. Because those loans are recorded at fair value, no carry-over of an acquired entity’s previously established allowance for credit losses may be recorded. Subsequent decreases in the expected cash flows require the Company to evaluate the need for additions to the Company’s allowance for credit losses. Subsequent improvements in expected cash flows result in the recognition of additional interest income over the then remaining lives of the loans. Residual value estimates for commercial leases are generally determined through internal or external reviews of the leased property. The Company reviews commercial lease residual values at least annually and recognizes residual value impairments deemed to be other than temporary.
Allowance for credit losses	*Allowance for credit losses* The allowance for credit losses represents the amount which, in management’s judgment, will be adequate to absorb credit losses inherent in the loan and lease portfolio as of the balance sheet date. The adequacy of the allowance is determined by management’s evaluation of the loan and lease portfolio based on such factors as the differing economic risks associated with each loan category, the current financial condition of specific borrowers, the economic environment in which borrowers operate, the level of delinquent loans, the value of any collateral and, where applicable, the existence of any guarantees or indemnifications.
Assets taken in foreclosure of defaulted loans	*Assets taken in foreclosure of defaulted loans* Assets taken in foreclosure of defaulted loans are primarily comprised of commercial and residential real property and are included in “other assets” in the consolidated balance sheet. Upon acquisition of assets taken in satisfaction of a defaulted loan, the excess of the remaining loan balance over the asset’s estimated fair value less costs to sell is charged off against the allowance for credit losses. Subsequent declines in value of the assets are recognized as “other expense” in the consolidated statement of income.
Premises and equipment	*Premises and equipment* Premises and equipment are stated at cost less accumulated depreciation. Depreciation expense is computed principally using the straight-line method over the estimated useful lives of the assets.
Capitalized servicing rights	*Capitalized servicing rights* Capitalized servicing assets are included in “other assets” in the consolidated balance sheet. Separately recognized servicing assets are initially measured at fair value. The Company uses the amortization method to subsequently measure servicing assets. Under that method, capitalized servicing assets are charged to expense in proportion to and over the period of estimated net servicing income. To estimate the fair value of servicing rights, the Company considers market prices for similar assets and the present value of expected future cash flows associated with the servicing rights calculated using assumptions that market participants would use in estimating future servicing income and expense. Such assumptions include estimates of the cost of servicing loans, loan default rates, an appropriate discount rate, and prepayment speeds. For purposes of evaluating and measuring impairment of capitalized servicing rights, the Company stratifies such assets based on the predominant risk characteristics of the underlying financial instruments that are expected to have the most impact on projected prepayments, cost of servicing and other factors affecting future cash flows associated with the servicing rights. Such factors may include financial asset or loan type, note rate and term. The amount of impairment recognized is the amount by which the carrying value of the capitalized servicing rights for a stratum exceeds estimated fair value. Impairment is recognized through a valuation allowance.
Sales and securitizations of financial assets	*Sales and securitizations of financial assets* Due to changes in GAAP, transfers of financial assets that occur on or after January 1, 2010 for which the Company has surrendered control of the financial assets are accounted for as sales. Interests in a sale of financial assets that continue to be held by the Company, including servicing rights, are measured at fair value. Prior to January 1, 2010, transfers of financial assets for which the Company had surrendered control of the financial assets were accounted for as sales to the extent that consideration other than beneficial interests in the transferred assets was received in exchange. Interests in a sale or securitization of financial assets that continued to be held by the Company, other than servicing rights which were initially measured at fair value, were measured at the date of transfer by allocating the previous carrying amount between the assets transferred and the retained interests based on their relative estimated fair values. The fair values of retained debt securities are generally determined through reference to independent pricing information. The fair values of retained servicing rights and any other retained interests are determined based on the present value of expected future cash flows associated with those interests and by reference to market prices for similar assets. Also due to changes in GAAP, for transfers of financial assets that occur on or after January 1, 2010 the exception that permitted sale accounting for certain mortgage securitizations when a transferor has not surrendered control over the transferred assets was eliminated. The change in GAAP also eliminated the concept of qualifying special-purpose entities. As a result, beginning January 1, 2010, all formerly qualifying special-purpose entities had to be re-evaluated in accordance with the applicable consolidation guidance. Additional information on the effects of this accounting change and changes in the accounting guidance relating to the consolidation of variable interest entities is included in note 19.
Goodwill and core deposit and other intangible assets	*Goodwill and core deposit and other intangible assets* Goodwill represents the excess of the cost of an acquired entity over the fair value of the identifiable net assets acquired. Goodwill is not amortized, but rather is tested for impairment at least annually at the reporting unit level, which is either at the same level or one level below an operating segment. Other acquired intangible assets with finite lives, such as core deposit intangibles, are initially recorded at estimated value and are amortized over their estimated lives. Core deposit and other intangible assets are generally amortized using accelerated methods over estimated useful lives of five to ten years. The Company periodically assesses whether events or changes in circumstances indicate that the carrying amounts of core deposit and other intangible assets may be impaired.
Derivative financial instruments	*Derivative financial instruments* The Company accounts for derivative financial instruments at fair value. If certain conditions are met, a derivative may be specifically designated as (a) a hedge of the exposure to changes in the fair value of a recognized asset or liability or an unrecognized firm commitment, (b) a hedge of the exposure to variable cash flows of a forecasted transaction or (c) a hedge of the foreign currency exposure of a net investment in a foreign operation, an unrecognized firm commitment, an available for sale security, or a foreign currency denominated forecasted transaction. The Company utilizes interest rate swap agreements as part of the management of interest rate risk to modify the repricing characteristics of certain portions of its portfolios of earning assets and interest-bearing liabilities. For such agreements, amounts receivable or payable are recognized as accrued under the terms of the agreement and the net differential is recorded as an adjustment to interest income or expense of the related asset or liability. Interest rate swap agreements may be designated as either fair value hedges or cash flow hedges. In a fair value hedge, the fair values of the interest rate swap agreements and changes in the fair values of the hedged items are recorded in the Company’s consolidated balance sheet with the corresponding gain or loss recognized in current earnings. The difference between changes in the fair values of interest rate swap agreements and the hedged items represents hedge ineffectiveness and is recorded in “other revenues from operations” in the consolidated statement of income. In a cash flow hedge, the effective portion of the derivative’s unrealized gain or loss is initially recorded as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings. The ineffective portion of the unrealized gain or loss is reported in “other revenues from operations” immediately. The Company utilizes commitments to sell real estate loans to hedge the exposure to changes in the fair value of real estate loans held for sale. Commitments to originate real estate loans to be held for sale and commitments to sell real estate loans are generally recorded in the consolidated balance sheet at estimated fair market value. Derivative instruments not related to mortgage banking activities, including financial futures commitments and interest rate swap agreements, that do not satisfy the hedge accounting requirements are recorded at fair value and are generally classified as trading account assets or liabilities with resultant changes in fair value being recognized in “trading account and foreign exchange gains” in the consolidated statement of income.
Stock-based compensation	*Stock-based compensation* Stock-based compensation expense is recognized over the vesting period of the stock-based grant based on the estimated grant date value of the stock-based compensation that is expected to vest, except that the recognition of compensation costs is accelerated for stock-based awards granted to retirement-eligible employees and employees who will become retirement-eligible prior to full vesting of the award because the Company’s incentive compensation plan allows for vesting at the time an employee retires. Information on the determination of the estimated value of stock-based awards used to calculate stock-based compensation expense is included in note 11.
Income taxes	*Income taxes* Deferred tax assets and liabilities are recognized for the future tax effects attributable to differences between the financial statement value of existing assets and liabilities and their respective tax bases and carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates and laws. The Company evaluates uncertain tax positions using the two-step process required by GAAP. The first step requires a determination of whether it is more likely than not that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Under the second step, a tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. Information related to uncertain tax positions is provided in note 13.
Earnings per common share	*Earnings per common share* Basic earnings per common share exclude dilution and are computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding (exclusive of shares represented by the unvested portion of restricted stock and restricted stock unit grants) and common shares issuable under deferred compensation arrangements during the period. Diluted earnings per common share reflect shares represented by the unvested portion of restricted stock and restricted stock unit grants and the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in earnings. Proceeds assumed to have been received on such exercise or conversion are assumed to be used to purchase shares of M&T common stock at the average market price during the period, as required by the “treasury stock method” of accounting. GAAP requires that for financial statements issued for fiscal years beginning after December 15, 2008 and interim periods within those years, unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) shall be considered participating securities and shall be included in the computation of earnings per common share pursuant to the two-class method. In 2009 and 2010, the Company issued stock-based compensation awards in the form of restricted stock and restricted stock units that contain such rights and, accordingly, beginning in 2009 the Company’s earnings per common share are calculated using the two-class method. The effects of the application of the two-class method to earnings per common share amounts for prior years were immaterial.
Treasury stock	*Treasury stock* Repurchases of shares of M&T common stock are recorded at cost as a reduction of shareholders’ equity. Reissuances of shares of treasury stock are recorded at average cost.

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2010

Acquisitions (Tables) [Abstract]

Fair value of acquired loan portfolio

In conjunction with the Provident acquisition, the acquired loan portfolio was accounted for at fair value as follows:


	May 23, 2009
	(In thousands)

Contractually required principal and interest at acquisition	$	5,465,167
Contractual cash flows not expected to be collected		(832,115	)

Expected cash flows at acquisition		4,633,052
Interest component of expected cash flows		(595,685	)

Basis in acquired loans at acquisition — estimated fair value	$	4,037,367

Outstanding principal balance and the carrying amount of acquired loans

The outstanding principal balance and the carrying amount of these loans that is included in the consolidated balance sheet is as follows:


	December 31
	2010		2009
	(In thousands)

Outstanding principal balance	$	3,139,025	$	3,875,415
Carrying amount		2,966,754		3,644,110

Pro forma information


			Pro Forma
	Actual Since		Year Ended
	Acquisition Through		December 31
	December 31, 2009		2009		2008
	(In thousands)

Total revenues	$	194,578	$	3,823,763	$	4,533,161
Net income		32,686		292,862		510,897

Summary of merger-related expenses associated with the Bradford and Provident acquisitions

A summary of merger-related expenses associated with acquisitions included in the consolidated statement of income for the years ended December 31, 2010, 2009 and 2008 follows:


	2010		2009		2008
	(In thousands)

Salaries and employee benefits	$	7	$	10,030	$	62
Equipment and net occupancy		44		2,975		49
Printing, postage and supplies		74		3,677		367
Other costs of operations		646		72,475		3,069

	$	771	$	89,157	$	3,547

Investment securities (Tables)

12 Months Ended

Dec. 31, 2010

Investment securities (Tables) [Abstract]

Amortized cost and estimated fair value of investment securities

The amortized cost and estimated fair value of investment securities were as follows:


			Gross		Gross
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
			(In thousands)

December 31, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	61,772	$	1,680	$	18	$	63,434
Obligations of states and political subdivisions		59,921		561		57		60,425
Mortgage-backed securities:
Government issued or guaranteed		3,146,054		161,298		1,111		3,306,241
Privately issued residential		1,677,064		10,578		252,081		1,435,561
Privately issued commercial		25,357		—		2,950		22,407
Collateralized debt obligations		95,080		24,754		9,078		110,756
Other debt securities		310,017		26,883		38,000		298,900
Equity securities		119,112		5,098		8,442		115,768

		5,494,377		230,852		311,737		5,413,492

Investment securities held to maturity:
Obligations of states and political subdivisions		191,119		1,944		694		192,369
Mortgage-backed securities:
Government issued or guaranteed		808,108		14,061		—		822,169
Privately issued		312,537		—		114,397		198,140
Other debt securities		12,575		—		—		12,575

		1,324,339		16,005		115,091		1,225,253

Other securities		412,709		—		—		412,709

Total	$	7,231,425	$	246,857	$	426,828	$	7,051,454

December 31, 2009
Investment securities available for sale:
U.S. Treasury and federal agencies	$	102,755	$	1,988	$	57	$	104,686
Obligations of states and political subdivisions		61,468		1,583		128		62,923
Mortgage-backed securities:
Government issued or guaranteed		3,777,642		131,407		6,767		3,902,282
Privately issued residential		2,438,353		9,630		383,079		2,064,904
Privately issued commercial		33,133		—		7,967		25,166
Collateralized debt obligations		103,159		23,389		11,202		115,346
Other debt securities		309,514		16,851		58,164		268,201
Equity securities		170,985		5,590		15,705		160,870

		6,997,009		190,438		483,069		6,704,378

Investment securities held to maturity:
Obligations of states and political subdivisions		203,825		1,419		1,550		203,694
Privately issued mortgage-backed securities		352,195		—		150,993		201,202
Other debt securities		11,587		—		—		11,587

		567,607		1,419		152,543		416,483

Other securities		508,624		—		—		508,624

Total	$	8,073,240	$	191,857	$	635,612	$	7,629,485

Investment ratings of all privately issued mortgage-backed securities, collateralized debt obligations and other debt securities


	Amortized		Estimated		Average Credit Rating of Fair Value Amount
	Cost		Fair Value		A or Better		BBB		BB		B or Less		Not Rated
	(In thousands)

Obligations of states and political subdivisions	$	251,040	$	252,794	$	172,088	$	39,222	$	200	$	—	$	41,284
Mortgage-backed securities:
Privately issued residential		1,989,601		1,633,701		736,043		138,522		37,699		721,437		—
Privately issued commercial		25,357		22,407		22,407		—		—		—		—
Collateralized debt obligations		95,080		110,756		6,474		12,268		14,917		77,097		—
Other debt securities		322,592		311,475		21,020		113,188		113,127		49,910		14,230

Total	$	2,683,670	$	2,331,133	$	958,032	$	303,200	$	165,943	$	848,444	$	55,514

Amortized cost and estimated fair value of collateralized mortgage obligations

The amortized cost and estimated fair value of collateralized mortgage obligations included in mortgage-backed securities were as follows:


	December 31
	2010		2009
	(In thousands)

Collateralized mortgage obligations:
Amortized cost	$	2,195,422	$	3,108,673
Estimated fair value		1,840,046		2,584,067

Changes in credit losses associated with debt securities for which other-than-temporary impairment losses

Changes in credit losses during 2010 and 2009 associated with debt securities for which other-than-temporary impairment losses have been previously recognized in earnings follows:


	Year Ended December 31
	2010			2009
	(In thousands)

Estimated credit losses — beginning balance	$	284,513		$	155,967
Additions for credit losses not previously recognized		74,288			138,297
Reductions for increases in cash flows		(754	)		(1,393	)
Reductions for realized losses		(30,135	)		(8,358	)

Estimated credit losses — ending balance	$	327,912		$	284,513

Amortized cost and estimated fair value of debt securities by contractual maturity

At December 31, 2010, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:


	Amortized		Estimated
	Cost		Fair Value
	(In thousands)

Debt securities available for sale:
Due in one year or less	$	40,263	$	40,367
Due after one year through five years		55,144		57,226
Due after five years through ten years		22,421		24,658
Due after ten years		408,962		411,264

		526,790		533,515
Mortgage-backed securities available for sale		4,848,475		4,764,209

	$	5,375,265	$	5,297,724

Debt securities held to maturity:
Due in one year or less	$	28,161	$	28,353
Due after one year through five years		10,628		10,971
Due after five years through ten years		138,361		139,162
Due after ten years		26,544		26,458

		203,694		204,944
Mortgage-backed securities held to maturity		1,120,645		1,020,309

	$	1,324,339	$	1,225,253

Investment securities in continuous unrealized loss position


	Less Than 12 Months					12 Months or More
			Unrealized					Unrealized
	Fair Value		Losses			Fair Value		Losses
			(In thousands)

December 31, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	27,289	$	(18	)	$	—	$	—
Obligations of states and political subdivisions		3,712		(18	)		2,062		(39	)
Mortgage-backed securities:
Government issued or guaranteed		68,507		(1,079	)		2,965		(32	)
Privately issued residential		61,192		(1,054	)		1,057,315		(251,027	)
Privately issued commercial		—		—			22,407		(2,950	)
Collateralized debt obligations		12,462		(6,959	)		6,004		(2,119	)
Other debt securities		2,134		(10	)		88,969		(37,990	)
Equity securities		5,326		(3,721	)		673		(4,721	)

		180,622		(12,859	)		1,180,395		(298,878	)

Investment securities held to maturity:
Obligations of states and political subdivisions		76,318		(638	)		467		(56	)
Privately issued mortgage-backed securities		—		—			198,140		(114,397	)

		76,318		(638	)		198,607		(114,453	)

Total	$	256,940	$	(13,497	)	$	1,379,002	$	(413,331	)

December 31, 2009
Investment securities available for sale:
U.S. Treasury and federal agencies	$	6,265	$	(53	)	$	572	$	(4	)
Obligations of states and political subdivisions		9,540		(83	)		3,578		(45	)
Mortgage-backed securities:
Government issued or guaranteed		685,319		(6,460	)		19,379		(307	)
Privately issued residential		98,312		(2,871	)		1,504,020		(380,208	)
Privately issued commercial		—		—			25,166		(7,967	)
Collateralized debt obligations		13,046		(10,218	)		3,598		(984	)
Other debt securities		5,786		(174	)		138,705		(57,990	)
Equity securities		7,449		(1,728	)		23,159		(13,977	)

		825,717		(21,587	)		1,718,177		(461,482	)

Investment securities held to maturity:
Obligations of states and political subdivisions		136,032		(1,492	)		626		(58	)
Privately issued mortgage-backed securities		—		—			201,202		(150,993	)

		136,032		(1,492	)		201,828		(151,051	)

Total	$	961,749	$	(23,079	)	$	1,920,005	$	(612,533	)

Loans and leases (Tables)

12 Months Ended

Dec. 31, 2010

Loans and leases (Tables) [Abstract]

Total gross loans and leases outstanding

Total loans and leases outstanding were comprised of the following:


	December 31
	2010			2009
	(In thousands)

Loans
Commercial, financial, etc.	$	11,999,065		$	11,913,437
Real estate:
Residential		5,876,413			5,401,932
Commercial		16,977,747			16,345,601
Construction		4,332,618			4,726,570
Consumer		11,483,564			12,041,617

Total loans		50,669,407			50,429,157
Leases
Commercial		1,646,535			1,877,300

Total loans and leases		52,315,942			52,306,457
Less: unearned discount		(325,560	)		(369,771	)

Total loans and leases, net of unearned discount	$	51,990,382		$	51,936,686

Summary of current, past due and nonaccrual loans

A summary of current, past due and nonaccrual loans as of December 31, 2010 was as follows:


					90 Days or More
			30-89 Days		Past Due and		Purchased
	Current		Past Due		Accruing		Impaired		Nonaccrual		Total
	(In thousands)

Commercial, financial, leasing, etc	$	13,088,887	$	96,087	$	16,647	$	2,250	$	186,739	$	13,390,610
Real estate:
Commercial		16,589,240		89,906		35,338		8,275		209,031		16,931,790
Residential builder and developer		891,764		30,805		9,763		72,710		346,448		1,351,490
Other commercial construction		2,723,399		36,420		11,323		2,098		126,641		2,899,881
Residential		4,699,711		229,641		192,276		9,320		172,729		5,303,677
Residential Alt-A		475,236		42,674		—		—		106,469		624,379
Consumer:
Home equity lines and loans		6,472,563		38,367		—		2,366		43,055		6,556,351
Automobile		2,608,230		44,604		—		—		31,892		2,684,726
Other		2,190,353		36,689		4,246		—		16,190		2,247,478

Total	$	49,739,383	$	645,193	$	269,593	$	97,019	$	1,239,194	$	51,990,382

Summary of lease financing receivables


	December 31
	2010			2009
	(In thousands)

Commercial leases:
Direct financings:
Lease payments receivable	$	1,205,499		$	1,406,238
Estimated residual value of leased assets		96,441			99,968
Unearned income		(181,771	)		(224,768	)

Investment in direct financings		1,120,169			1,281,438
Leveraged leases:
Lease payments receivable		164,818			185,679
Estimated residual value of leased assets		179,777			185,415
Unearned income		(63,154	)		(74,131	)

Investment in leveraged leases		281,441			296,963

Total investment in leases	$	1,401,610		$	1,578,401

Deferred taxes payable arising from leveraged leases	$	202,566		$	212,910

Minimum future lease payments to be received from lease financings

At December 31, 2010, the minimum future lease payments to be received from lease financings were as follows:


	Total
	(In thousands)

Year ending December 31:
2011	$	316,545
2012		287,561
2013		186,582
2014		126,186
2015		86,833
Later years		366,610

	$	1,370,317

Allowance for credit losses (Tables)

12 Months Ended

Dec. 31, 2010

Allowance for credit losses (Tables) [Abstract]

Allowance for credit Losses

Changes in the allowance for credit losses for the year ended December 31, 2010 were as follows:


	Commercial,
	Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(In thousands)

Beginning balance	$	219,170		$	359,770		$	91,582		$	137,124		$	70,376	$	878,022
Provision for credit losses		58,438			159,023			52,960			97,573			6		368,000
Consolidation of loan securitization trusts		—			—			2,752			—			—		2,752
Net charge-offs
Charge-offs		(91,650	)		(124,087	)		(71,016	)		(125,593	)		—		(412,346	)
Recoveries		26,621			5,856			10,073			23,963			—		66,513

Net charge-offs		(65,029	)		(118,231	)		(60,943	)		(101,630	)		—		(345,833	)

Ending balance	$	212,579		$	400,562		$	86,351		$	133,067		$	70,382	$	902,941


	Year Ended December 31
	2009			2008
	(In thousands)

Beginning balance	$	787,904		$	759,439
Provision for credit losses		604,000			412,000
Allowance related to loans sold or securitized		—			(525	)
Net charge-offs
Charge-offs		(556,462	)		(420,655	)
Recoveries		42,580			37,645

Net charge-offs		(513,882	)		(383,010	)

Ending balance	$	878,022		$	787,904

Impaired loans and leases

The following table provides information with respect to impaired loans and leases as of and for the year ended December 31, 2010.


	December 31, 2010						Year Ended December 31, 2010
			Unpaid				Average
	Recorded		Principal		Related		Recorded		Interest Income Recognized
	Investment		Balance		Allowance		Investment		Total		Cash Basis
	(In thousands)

With an allowance recorded:
Commercial, financial, leasing, etc.	$	121,744	$	170,888	$	40,909
Real estate:
Commercial		110,975		140,015		17,393
Residential builder and developer		263,545		295,031		78,597
Other commercial construction		80,934		85,432		22,067
Residential		73,006		85,279		3,375
Residential Alt-A		180,665		191,445		36,000
Consumer:
Home equity lines and loans		11,799		13,378		2,227
Automobile		58,858		58,858		12,597
Other		2,978		2,978		768

		904,504		1,043,304		213,933

With no related allowance recorded:
Commercial, financial, leasing, etc.		65,827		86,332		—
Real estate:
Commercial		101,939		116,316		—
Residential builder and developer		100,799		124,383		—
Other commercial construction		46,656		50,496		—
Residential		5,035		7,723		—
Residential Alt-A		28,967		47,879		—

		349,223		433,129		—

Total:
Commercial, financial, leasing, etc.		187,571		257,220		40,909	$	266,685	$	5,027	$	5,003
Real estate:
Commercial		212,914		256,331		17,393		233,429		1,990		1,748
Residential builder and developer		364,344		419,414		78,597		322,249		1,723		753
Other commercial construction		127,590		135,928		22,067		64,436		462		449
Residential		78,041		93,002		3,375		62,104		3,079		1,793
Residential Alt-A		209,632		239,324		36,000		220,589		8,397		1,758
Consumer:
Home equity lines and loans		11,799		13,378		2,227		11,807		790		202
Automobile		58,858		58,858		12,597		54,221		3,684		1,233
Other		2,978		2,978		768		3,165		243		48

Total	$	1,253,727	$	1,476,433	$	213,933	$	1,238,685	$	25,395	$	12,987

Summary of Loan grades

The following table summarizes the loan grades applied to the Company’s commercial and commercial real estate loans as of December 31, 2010.


			Real Estate
	Commercial,				Residential		Other
	Financial,				Builder and		Commercial
	Leasing, etc		Commercial		Developer		Construction
	(In thousands)

Pass	$	12,371,138	$	15,831,104	$	693,110	$	2,253,589
Criticized accrual		832,733		891,655		311,932		519,651
Criticized nonaccrual		186,739		209,031		346,448		126,641

Total	$	13,390,610	$	16,931,790	$	1,351,490	$	2,899,881

Allocation of allowance for credit losses on the basis of the Company's impairment methodology

At December 31, 2010 the allocation of the allowance for credit losses summarized on the basis of the Company’s impairment methodology was as follows:


	Commercial,
	Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(In thousands)

Individually evaluated for impairment	$	40,459	$	114,082	$	39,000	$	15,492	$	209,033
Collectively evaluated for impairment		171,670		282,505		46,976		117,475		618,626
Purchased impaired		450		3,975		375		100		4,900

Allocated	$	212,579	$	400,562	$	86,351	$	133,067	$	832,559

Unallocated										70,382

Total									$	902,941

Recorded investment in loans and leases on the basis of the Company's impairment methodology

The recorded investment in loans and leases summarized on the basis of the Company’s impairment methodology as of December 31, 2010 was as follows:


	Commercial,
	Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(In thousands)

Individually evaluated for impairment	$	186,739	$	682,120	$	286,612	$	72,082	$	1,227,553
Collectively evaluated for impairment		13,201,621		20,417,958		5,632,124		11,414,107		50,665,810
Purchased impaired		2,250		83,083		9,320		2,366		97,019

Total	$	13,390,610	$	21,183,161	$	5,928,056	$	11,488,555	$	51,990,382

Premises and equipment (Tables)

12 Months Ended

Dec. 31, 2010

Premises and equipment (Tables) [Abstract]

Premises and equipment

The detail of premises and equipment was as follows:


	December 31
	2010		2009
	(In thousands)

Land	$	64,728	$	63,961
Buildings — owned		280,288		271,181
Buildings — capital leases		1,131		1,131
Leasehold improvements		172,638		165,110
Furniture and equipment — owned		366,227		345,421
Furniture and equipment — capital leases		1,387		—

		886,399		846,804
Less: accumulated depreciation and amortization
Owned assets		449,571		410,218
Capital leases		991		741

		450,562		410,959

Premises and equipment, net	$	435,837	$	435,845

Capitalized Servicing Assets (Tables)

12 Months Ended

Dec. 31, 2010

Capitalized Servicing Assets (Tables) [Abstract]

Changes in capitalized servicing assets

Changes in capitalized servicing assets were as follows:


										Small-Balance
	Residential Mortgage Loans									Commercial Mortgage Loans
For Year Ended December 31,	2010			2009			2008			2010			2009			2008
	(In thousands)

Beginning balance	$	101,155		$	106,979		$	118,763		$	40,251		$	58,044		$	56,956
Originations		27,430			31,034			17,765			—			—			—
Purchases		593			972			3,322			—			—			20,974
Assumed in loan securitizations (note 19)		—			788			8,455			—			—			—
Consolidation of loan securitization trusts (note 19)		(1,843	)		—			—			—			—			—
Amortization		(35,269	)		(38,618	)		(41,326	)		(14,054	)		(17,793	)		(19,886	)

		92,066			101,155			106,979			26,197			40,251			58,044
Valuation allowance		—			(50	)		(22,000	)		—			—			—

Ending balance, net	$	92,066		$	101,105		$	84,979		$	26,197		$	40,251		$	58,044


	Commercial Mortgage Loans									Total
For Year Ended December 31,	2010			2009			2008			2010			2009			2008
	(In thousands)

Beginning balance	$	32,896		$	26,336		$	20,240		$	174,302		$	191,359		$	195,959
Originations		16,976			12,417			10,606			44,406			43,451			28,371
Purchases		—			—			—			593			972			24,296
Assumed in loan securitizations (note 19)		—			—			—			—			788			8,455
Consolidation of loan securitization trusts (note 19)		—			—			—			(1,843	)		—			—
Amortization		(7,259	)		(5,857	)		(4,510	)		(56,582	)		(62,268	)		(65,722	)

		42,613			32,896			26,336			160,876			174,302			191,359
Valuation allowance		—			—			—			—			(50	)		(22,000	)

Ending balance, net	$	42,613		$	32,896		$	26,336		$	160,876		$	174,252		$	169,359

Economic assumptions used to determine the fair value of capitalized servicing rights and the sensitivity of value to changes in the assumptions


				Small-Balance
	Residential			Commercial			Commercial

Weighted-average prepayment speeds		13.60	%		7.98	%
Impact on fair value of 10% adverse change	$	(8,017,000	)	$	(2,358,000	)
Impact on fair value of 20% adverse change		(15,254,000	)		(4,521,000	)
Weighted-average OAS		7.48	%		17.78	%
Impact on fair value of 10% adverse change	$	(1,188,000	)	$	(1,913,000	)
Impact on fair value of 20% adverse change		(4,047,000	)		(3,742,000	)
Weighted-average discount rate								18.00	%
Impact on fair value of 10% adverse change							$	(2,245,000	)
Impact on fair value of 20% adverse change								(4,324,000	)

Goodwill and other intangible assets (Tables)

12 Months Ended

Dec. 31, 2010

Goodwill and other intangible assets (Tables) [Abstract]

Total amortizing intangible assets

Total amortizing intangible assets were comprised of the following:


	Gross Carrying		Accumulated		Net Carrying
	Amount		Amortization		Amount
	(In thousands)

December 31, 2010
Core deposit	$	701,000	$	576,986	$	124,014
Other		119,968		118,065		1,903

Total	$	820,968	$	695,051	$	125,917

December 31, 2009
Core deposit	$	701,000	$	524,358	$	176,642
Other		118,366		112,590		5,776

Total	$	819,366	$	636,948	$	182,418

Estimated amortization expense in future years for such intangible assets

Estimated amortization expense in future years for such intangible assets is as follows:


	(In thousands)

Year ending December 31:
2011	$	42,139
2012		32,668
2013		24,072
2014		16,109
2015		8,346
Later years		2,583

	$	125,917

Summary of goodwill assigned to reportable segments for purposes of testing for impairment

A summary of goodwill assigned to each of the Company’s reportable segments as of December 31, 2010 and 2009 for purposes of testing for impairment is as follows.


	(In thousands)

Business Banking	$	748,907
Commercial Banking		907,524
Commercial Real Estate		349,197
Discretionary Portfolio		—
Residential Mortgage Banking		—
Retail Banking		1,144,404
All Other		374,593

Total	$	3,524,625

Borrowings (Tables)

12 Months Ended

Dec. 31, 2010

Borrowings (Tables) [Abstract]

Amounts and interest rates of short-term borrowings

The amounts and interest rates of short-term borrowings were as follows:


	Federal Funds
	Purchased
	and			Other
	Repurchase			Short-term
	Agreements			Borrowings			Total
	(Dollars in thousands)

At December 31, 2010
Amount outstanding	$	866,555		$	80,877		$	947,432
Weighted-average interest rate		0.19	%		0.20	%		0.19	%
For the year ended December 31, 2010
Highest amount at a month-end	$	2,612,727		$	236,842
Daily-average amount outstanding		1,749,525			104,508		$	1,854,033
Weighted-average interest rate		0.15	%		0.33	%		0.16	%
At December 31, 2009
Amount outstanding	$	2,211,692		$	230,890		$	2,442,582
Weighted-average interest rate		0.04	%		0.66	%		0.10	%
For the year ended December 31, 2009
Highest amount at a month-end	$	2,491,573		$	2,049,727
Daily-average amount outstanding		1,885,464			1,025,601		$	2,911,065
Weighted-average interest rate		0.15	%		0.42	%		0.24	%
At December 31, 2008
Amount outstanding	$	970,529		$	2,039,206		$	3,009,735
Weighted-average interest rate		0.10	%		0.36	%		0.27	%
For the year ended December 31, 2008
Highest amount at a month-end	$	5,291,846		$	2,039,206
Daily-average amount outstanding		4,652,388			1,433,734		$	6,086,122
Weighted-average interest rate		2.15	%		2.97	%		2.34	%

Lines of credit under formal agreements

At December 31, 2010, the Company had lines of credit under formal agreements as follows:


					M&T
	M&T		M&T Bank		Bank, N.A.
	(In thousands)

Outstanding borrowings	$	—	$	2,897,133	$	—
Unused		30,000		12,914,549		98,158

Long-term borrowings

Long-term borrowings were as follows:


	December 31,
	2010		2009
	(In thousands)

Senior notes of M&T — 5.375% due 2012	$	299,971	$	299,950
Advances from FHLB:
Variable rates		2,525,268		4,405,925
Fixed rates		347,161		818,562
Agreements to repurchase securities		1,625,001		1,625,001
Subordinated notes of M&T Bank:
8% due 2010		—		140,854
3.85% due 2013, variable rate commenced in 2008		400,000		400,000
6.625% due 2017		425,969		404,428
9.5% due 2018		50,000		50,000
5.585% due 2020, variable rate commencing 2015		372,668		366,883
5.629% due 2021, variable rate commencing 2016		568,196		545,194
Junior subordinated debentures associated with preferred capital securities:
Fixed rates:
M&T Capital Trust I — 8.234%, due 2027		154,640		154,640
M&T Capital Trust II — 8.277%, due 2027		103,093		103,093
M&T Capital Trust III — 9.25%, due 2027		67,084		67,409
BSB Capital Trust I — 8.125%, due 2028		15,519		15,496
Provident Trust I — 8.29%, due 2028		24,256		24,061
Southern Financial Statutory Trust I — 10.60%, due 2030		6,455		6,439
M&T Capital Trust IV — 8.50%, due 2068		350,010		350,010
Variable rates:
First Maryland Capital I — due 2027		143,025		142,487
First Maryland Capital II — due 2027		143,975		143,312
Allfirst Asset Trust — due 2029		95,623		95,477
BSB Capital Trust III — due 2033		15,464		15,464
Provident Trust III — due 2033		50,823		50,430
Southern Financial Capital Trust III — due 2033		7,566		7,513
Other		48,384		7,388

	$	7,840,151	$	10,240,016

Maturity of Long-term borrowings

Long-term borrowings at December 31, 2010 mature as follows:


	(In thousands)

Year ending December 31:
2011	$	1,886,860
2012		1,560,616
2013		392,870
2014		7,570
2015		—
Later years		3,992,235

	$	7,840,151

Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2010

Shareholders Equity (Tables) [Abstract]

Issued and outstanding preferred stock

Issued and outstanding preferred stock of M&T is presented below:


	Shares		Carrying		Carrying
	Issued and		Value		Value
	Outstanding		December 31, 2010		December 31, 2009
	(Dollars in thousands)

Series A(a)
Fixed Rate Cumulative Perpetual Preferred Stock, Series A, $1,000 liquidation preference per share, 600,000 shares authorized		600,000	$	578,630	$	572,580
Series B(b)
Series B Mandatory Convertible Non-cumulative Preferred Stock, $1,000 liquidation preference per share, 26,500 shares authorized		26,500		26,500		26,500
Series C(a)(c)
Fixed Rate Cumulative Perpetual Preferred Stock, Series C, $1,000 liquidation preference per share, 151,500 shares authorized		151,500		135,527		131,155


(a)		Shares were issued as part of the Troubled Asset Relief Program — Capital Purchase Program of the U.S. Department of Treasury (“U.S. Treasury”). Cash proceeds were allocated between the preferred stock and a ten-year warrant to purchase M&T common stock (Series A — 1,218,522 common shares at $73.86 per share, Series C — 407,542 common shares at $55.76 per share). Dividends, if declared, will accrue and be paid quarterly at a rate of 5% per year for the first five years following the original 2008 issuance dates and thereafter at a rate of 9% per year. The agreement with the U.S. Treasury contains limitations on certain actions of M&T, including the payment of quarterly cash dividends on M&T’s common stock in excess of $.70 per share, the repurchase of its common stock during the first three years of the agreement, and the amount and nature of compensation arrangements for certain of the Company’s officers.


(b)		Shares were assumed in the Provident acquisition and a new Series B Preferred Stock was designated. In the aggregate, the shares of Series B Preferred Stock will automatically convert into 433,148 shares of M&T common stock on April 1, 2011, but shareholders may elect to convert their preferred shares at any time prior to that date. Dividends, if declared, are payable quarterly in arrears at a rate of 10% per year.

(c)		Shares were assumed in the Provident acquisition and a new Series C Preferred Stock was designated.

Stock-based compensation plans (Tables)

12 Months Ended

Dec. 31, 2010

Stock-based compensation plans (Tables) [Abstract]

Summary of stock option activity

A summary of restricted stock and restricted stock unit activity follows:


	Restricted			Weighted-		Restricted			Weighted-
	Stock Units			Average		Stock			Average
	Outstanding			Grant Price		Outstanding			Grant Price

Unvested at January 1, 2010		566,449		$	39.21		733,687		$	42.52
Granted		231,037			73.75		423,002			75.37
Vested		(74,144	)		41.58		(165,799	)		65.33
Cancelled		(3,366	)		52.07		(25,818	)		49.74

Unvested at December 31, 2010		719,976		$	49.99		965,072		$	52.81

Summary of restricted stock and restricted stock unit activity

A summary of stock option activity follows:


	Stock			Weighted-Average				Aggregate
	Options			Exercise		Life		Intrinsic Value
	Outstanding			Price		(In Years)		(In thousands)

Outstanding at January 1, 2010		12,180,017		$	94.45
Granted		3,386			73.75
Exercised		(1,148,798	)		65.32
Cancelled		(50,368	)		98.40
Expired		(405,822	)		100.65

Outstanding at December 31, 2010		10,578,415		$	97.35		4.6	$	25,690

Exercisable at December 31, 2010		8,106,077		$	97.49		3.9	$	22,882

Pension plans and other postretirement benefits (Tables)

12 Months Ended

Dec. 31, 2010

Pension plans and other postretirement benefits (Tables) [Abstract]

Net periodic pension expense for defined benefit plans

Net periodic pension expense for defined benefit plans consisted of the following:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Service cost	$	19,670		$	19,483		$	19,409
Interest cost on benefit obligation		47,905			46,107			42,544
Expected return on plan assets		(50,844	)		(46,976	)		(46,092	)
Amortization of prior service cost		(6,559	)		(6,559	)		(6,559	)
Recognized net actuarial loss		13,551			8,292			3,942

Net periodic pension expense	$	23,723		$	20,347		$	13,244

Net other postretirement benefits expense for defined benefit plans

Net other postretirement benefits expense for defined benefit plans consisted of the following:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Service cost	$	383		$	353		$	559
Interest cost on benefit obligation		3,130			3,302			4,033
Amortization of prior service cost		176			243			275
Recognized net actuarial loss		(9	)		(19	)		42

Net other postretirement benefits expense	$	3,680		$	3,879		$	4,909

Data relating to the funding position of the defined benefit plans

Data relating to the funding position of the defined benefit plans were as follows:


							Other
	Pension Benefits						Postretirement Benefits
	2010			2009			2010			2009
	(In thousands)

Change in benefit obligation:
Benefit obligation at beginning of year	$	857,122		$	750,913		$	56,575		$	62,950
Service cost		19,670			19,483			383			353
Interest cost		47,905			46,107			3,130			3,302
Plan participants’ contributions		—			—			2,776			3,138
Actuarial (gain) loss		64,061			26,694			6,433			(5,209	)
Settlements/curtailments		(3,231	)		(7,232	)		—			—
Business combinations		—			58,239			—			343
Medicare Part D reimbursement		—			—			789			870
Benefits paid		(37,534	)		(37,082	)		(8,411	)		(9,172	)

Benefit obligation at end of year		947,993			857,122			61,675			56,575

Change in plan assets:
Fair value of plan assets at beginning of year		766,880			550,671			—			—
Actual return on plan assets		107,846			158,945			—			—
Employer contributions		4,504			48,528			4,846			5,164
Business combinations		—			51,657			—			—
Plan participants’ contributions		—			—			2,776			3,138
Medicare Part D reimbursement		—			—			789			870
Settlements		(3,231	)		(5,839	)		—			—
Benefits and other payments		(37,534	)		(37,082	)		(8,411	)		(9,172	)

Fair value of plan assets at end of year		838,465			766,880			—			—

Funded status	$	(109,528	)	$	(90,242	)	$	(61,675	)	$	(56,575	)

Assets and liabilities recognized in the consolidated balance sheet were:
Net prepaid asset	$	6,629		$	6,266		$	—		$	—
Accrued liabilities		(116,157	)		(96,508	)		(61,675	)		(56,575	)

Amounts recognized in accumulated other comprehensive income (“AOCI”) were:
Net loss (gain)	$	232,725		$	239,219		$	2,577		$	(3,663	)
Net prior service cost		(36,572	)		(43,131	)		269			243

Pre-tax adjustment to AOCI		196,153			196,088			2,846			(3,420	)
Taxes		(76,990	)		(76,950	)		(1,117	)		1,328

Net adjustment to AOCI	$	119,163		$	119,138		$	1,729		$	(2,092	)

Changes in plan assets and benefit obligations recognized in other comprehensive income

The table below reflects the changes in plan assets and benefit obligations recognized in other comprehensive income related to the Company’s postretirement benefit plans.


				Other
				Postretirement
	Pension Plans			Benefit Plans			Total
	(In thousands)

2010
Net loss (gain)	$	7,057		$	6,433		$	13,490
Amortization of prior service (cost) credit		6,559			(176	)		6,383
Amortization of (loss) gain		(13,551	)		9			(13,542	)

Total recognized in other comprehensive income, pre-tax	$	65		$	6,266		$	6,331

2009
Net loss (gain)	$	(85,265	)	$	(5,209	)	$	(90,474	)
Amortization of prior service (cost) credit		6,559			(242	)		6,317
Amortization of (loss) gain		(9,685	)		19			(9,666	)

Total recognized in other comprehensive income, pre-tax	$	(88,391	)	$	(5,432	)	$	(93,823	)

Amortization of amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit expense

The following table reflects the amortization of amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit expense during 2011:


				Other
				Postretirement
	Pension Plans			Benefit Plans
	(In thousands)

Amortization of net prior service cost (credit)	$	(6,559	)	$	108
Amortization of net loss		20,379			18

Assumed weighted-average rates used to determine benefit obligations

The assumed weighted-average rates used to determine benefit obligations at December 31 were:


							Other
	Pension						Postretirement
	Benefits						Benefits
	2010			2009			2010			2009

Discount rate		5.25	%		5.75	%		5.25	%		5.75	%
Rate of increase in future compensation levels		4.50	%		4.50	%		—			—

Assumed weighted-average rates used to determine net benefit expense

The assumed weighted-average rates used to determine net benefit expense for the years ended December 31 were:


										Other
	Pension Benefits									Postretirement Benefits
	2010			2009			2008			2010			2009			2008

Discount rate		5.75	%		6.00	%		6.00	%		5.75	%		6.00	%		6.00	%
Long-term rate of return on plan assets		6.50	%		6.50	%		7.50	%		—			—			—
Rate of increase in future compensation levels		4.50	%		4.60	%		4.60	%		—			—			—

Effects on one-percentage point change in assumed health care cost trend rates

A one-percentage point change in assumed health care cost trend rates would have had the following effects:


	+1%		-1%
	(In thousands)

Increase (decrease) in:
Service and interest cost	$	143	$	(128	)
Accumulated postretirement benefit obligation		3,218		(2,876	)

Fair values of Company's pension plan assets by asset category

The fair values of the Company’s pension plan assets at December 31, 2010, by asset category, are as follows:


	Fair Value Measurement of Plan Assets At December 31, 2010
			Quoted Prices
			in Active		Significant		Significant
			Markets		Observable		Unobservable
			for Identical Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
	(In thousands)

Asset category:
Money-market funds	$	26,389		26,389		—		—
Equity securities:
M&T		106,891		106,891		—		—
Domestic(a)		148,218		148,218		—		—
International		9,690		9,690		—		—
Mutual funds:
Domestic		54,039		54,039		—		—
International		150,961		150,961		—		—

		469,799		469,799		—		—

Debt securities:
Corporate(b)		204,899		—		204,899		—
Government		65,589		—		65,589		—
International		7,143		—		7,143		—
Mutual funds:
Domestic(c)		35,594		35,594		—		—
International		25,491		25,491		—		—

		338,716		61,085		277,631		—

Total(d)	$	834,904		557,273		277,631		—

The fair values of the Company’s pension plan assets at December 31, 2009, by asset category, are as follows:


	Fair Value Measurement of Plan Assets At December 31, 2009
			Quoted Prices
			in Active		Significant		Significant
			Markets		Observable		Unobservable
			for Identical Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
	(In thousands)

Asset category:
Money-market funds	$	27,560		27,560		—		—
Equity securities:
M&T		82,136		82,136		—		—
Domestic(a)		162,401		162,401		—		—
International		8,021		8,021		—		—
Mutual Funds:
Domestic		40,195		40,195		—		—
International		130,767		130,767		—		—

		423,520		423,520		—		—

Debt securities:
Corporate(b)		194,515		—		194,515		—
Government		50,054		—		50,054		—
International		5,440		—		5,440		—
Mutual Funds:
Domestic(c)		38,833		38,833		—		—
International		23,320		23,320		—		—

		312,162		62,153		250,009		—

Total(d)	$	763,242		513,233		250,009		—


(a)		This category is comprised of equities of companies primarily within the mid-cap and large-cap sector of the U.S. economy and range across diverse industries.

(b)		This category represents investment grade bonds of U.S. issuers from diverse industries.

(c)		Approximately 30% of the mutual funds are invested in investment grade bonds of U.S. issuers and 70% in high-yielding bonds. The holdings within the funds are spread across diverse industries.

(d)		Excludes dividends and interest receivable totaling $3,561,000 and $3,638,000 at December 31, 2010 and 2009, respectively.

Defined Benefit Plan Estimated Future Benefit Payments

Estimated benefits expected to be paid in future years related to the Company’s defined benefit pension and other postretirement benefits plans are as follows:


			Other
	Pension		Postretirement
	Benefits		Benefits
	(In thousands)

Year ending December 31:
2011	$	43,599	$	6,399
2012		46,144		6,294
2013		48,794		6,236
2014		52,435		6,177
2015		54,847		6,081
2016 through 2020		326,134		28,318

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2010

Income Taxes (Tables) [Abstract]

Components of income tax expense (benefit)

The components of income tax expense (benefit) were as follows:


	Year Ended December 31
	2010		2009		2008
	(In thousands)

Current
Federal	$	250,489	$	52,792	$	231,426
State and city		55,071		4,107		(30,514	)

Total current		305,560		56,899		200,912

Deferred
Federal		47,123		67,372		(10,095	)
State and city		3,945		15,129		(6,925	)

Total deferred		51,068		82,501		(17,020	)

Total income taxes applicable to pre-tax income	$	356,628	$	139,400	$	183,892

Income taxes expense difference from the amount computed by applying the statutory federal income tax rate to pre-tax income

Total income taxes differed from the amount computed by applying the statutory federal income tax rate to pre-tax income as follows:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Income taxes at statutory rate	$	382,476		$	181,752		$	258,923
Increase (decrease) in taxes:
Tax-exempt income		(32,466	)		(31,071	)		(31,668	)
State and city income taxes, net of federal income tax effect		38,360			12,503			(24,335	)
Low income housing credits		(29,882	)		(20,749	)		(21,170	)
Other		(1,860	)		(3,035	)		2,142

	$	356,628		$	139,400		$	183,892

Deferred tax assets (liabilities)

Deferred tax assets (liabilities) were comprised of the following at December 31:


	2010			2009			2008
	(In thousands)

Losses on loans and other assets	$	550,970		$	642,427		$	389,177
Postretirement and other employee benefits		48,863			46,316			43,874
Incentive compensation plans		27,388			27,835			28,489
Interest on loans		43,563			35,772			38,835
Retirement benefits		21,694			14,305			62,185
Stock-based compensation		70,641			69,881			58,837
Unrealized investment losses		54,557			140,821			331,616
Depreciation and amortization		13,332			6,274			10,141
Capitalized servicing rights		—			—			3,243
Other		51,768			40,281			28,478

Gross deferred tax assets		882,776			1,023,912			994,875

Leasing transactions		(294,510	)		(306,799	)		(316,444	)
Capitalized servicing rights		(14,739	)		(8,412	)		—
Interest on subordinated note exchange		(13,534	)		(15,051	)		(16,264	)
Other		(36,080	)		(32,617	)		(9,691	)

Gross deferred tax liabilities		(358,863	)		(362,879	)		(342,399	)

Net deferred tax asset	$	523,913		$	661,033		$	652,476

Reconciliation of the beginning and ending amount of unrecognized tax benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits follows:


	Federal,						Unrecognized
	State and			Accrued			Income Tax
	Local Tax			Interest			Benefits
	(In thousands)

Gross unrecognized tax benefits at January 1, 2008	$	120,044		$	26,368		$	146,412
Increases in unrecognized tax benefits as a result of tax positions taken during 2008		2,405			—			2,405
Increases in unrecognized tax benefits as a result of tax positions taken during prior years		—			15,837			15,837
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years		(52,399	)		(15,533	)		(67,932	)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities		(31,763	)		(9,116	)		(40,879	)

Gross unrecognized tax benefits at December 31, 2008		38,287			17,556			55,843
Increases in unrecognized tax benefits as a result of tax positions taken during 2009		400			—			400
Increases in unrecognized tax benefits as a result of tax positions taken during prior years		—			3,675			3,675
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination		(9,902	)		(1,392	)		(11,294	)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities		(825	)		(331	)		(1,156	)
Unrecognized tax benefits acquired in a business combination		337			—			337

Gross unrecognized tax benefits at December 31, 2009		28,297			19,508			47,805
Increases in unrecognized tax benefits as a result of tax positions taken during prior years		—			11,468			11,468
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination		(1,403	)		(670	)		(2,073	)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities		(967	)		(549	)		(1,516	)
Decreases in unrecognized tax benefits as a result of tax positions taken in prior years		(1,074	)		(9,061	)		(10,135	)

Gross unrecognized tax benefits at December 31, 2010	$	24,853		$	20,696			45,549

Less: Federal, state and local income tax benefits								(15,478	)

Net unrecognized tax benefits at December 31, 2010 that, if recognized, would impact the effective income tax rate							$	30,071

Earnings per common share (Tables)

12 Months Ended

Dec. 31, 2010

Earnings per common share (Tables) [Abstract]

Computations of basic earnings per common share

The computations of basic earnings per common share follow:


	Year Ended December 31
	2010			2009			2008
	(In thousands, except per share)

Income available to common shareholders:
Net income	$	736,161		$	379,891		$	555,887
Less: Preferred stock dividends(a)		(40,225	)		(36,081	)		(667	)
Amortization of preferred stock discount(a)		(10,518	)		(8,130	)		(124	)

Net income available to common equity		685,418			335,680			555,096
Less: Income attributable to unvested stock-based compensation awards		(9,592	)		(3,674	)		—

Net income available to common shareholders	$	675,826		$	332,006		$	555,096
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		119,852			115,838			110,211
Less: Unvested stock-based compensation awards		(1,661	)		(1,178	)		—

Weighted-average shares outstanding		118,191			114,660			110,211
Basic earnings per common share	$	5.72		$	2.90		$	5.04


(a)		Including impact of not as yet declared cumulative dividends.

Computations of diluted earnings per common share

The computations of diluted earnings per common share follow:


	Year Ended December 31
	2010			2009			2008
	(In thousands, except per share)

Net income available to common equity	$	685,418		$	335,680		$	555,096
Less: Income attributable to unvested stock-based compensation awards		(9,565	)		(3,674	)		—

Net income available to common shareholders	$	675,853		$	332,006		$	555,096
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		119,852			115,838			110,211
Less: Unvested stock-based compensation awards		(1,661	)		(1,178	)		—
Plus: Incremental shares from assumed conversion of stock-based compensation awards and convertible preferred stock		652			116			693

Adjusted weighted-average shares outstanding		118,843			114,776			110,904
Diluted earnings per common share	$	5.69		$	2.89		$	5.01

Comprehensive income (Tables)

12 Months Ended

Dec. 31, 2010

Comprehensive income (Tables) [Abstract]

Components of other comprehensive income (loss)

The following table displays the components of other comprehensive income:


	Before-tax			Income
	Amount			Taxes			Net
	(In thousands)

For the year ended December 31, 2010
Unrealized gains (losses) on investment securities:
Available-for-sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):
Securities with OTTI charges	$	(104,039	)	$	40,566		$	(63,473	)
Less: OTTI charges recognized in net income		(81,199	)		31,552			(49,647	)

Net unrealized losses on investment securities with OTTI		(22,840	)		9,014			(13,826	)
AFS investment securities — all other:
Unrealized holding gains		132,128			(51,624	)		80,504
Less: reclassification adjustment for gains realized in net income		1,581			(610	)		971
Less: securities with OTTI charges		(104,039	)		40,566			(63,473	)

		234,586			(91,580	)		143,006
Held-to-maturity (“HTM”) investment securities previously transferred from AFS to HTM with OTTI:
Securities with OTTI charges		(11,908	)		4,674			(7,234	)
Less: Impairment previously reflected in other comprehensive income		(7,984	)		3,134			(4,850	)
Less: OTTI charges recognized in net income		(5,082	)		1,995			(3,087	)

Net change for investment securities with OTTI		1,158			(455	)		703

Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		8,264			(3,243	)		5,021

		9,422			(3,698	)		5,724
Net unrealized gains on investment securities		221,168			(86,264	)		134,904
Reclassification to income for amortization of gains on terminated cash flow hedges		(448	)		167			(281	)
Defined benefit plans liability adjustment		(6,331	)		2,485			(3,846	)

	$	214,389		$	(83,612	)	$	130,777

For the year ended December 31, 2009
Unrealized gains (losses) on investment securities:
AFS investment securities with OTTI:
Securities with OTTI charges	$	(264,363	)	$	103,409		$	(160,954	)
Less: OTTI charges recognized in net income		(138,297	)		54,115			(84,182	)

Net unrealized losses on investment securities with OTTI		(126,066	)		49,294			(76,772	)
AFS investment securities — all other:
Unrealized holding gains		375,733			(144,228	)		231,505
Less: reclassification adjustment for gains realized in net income		219			(85	)		134
Less: securities with OTTI charges		(264,363	)		103,409			(160,954	)

		639,877			(247,552	)		392,325
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		14,027			7,463			21,490

Net unrealized gains on investment securities		527,838			(190,795	)		337,043
Reclassification to income for amortization of losses on terminated cash flow hedges		10,761			(4,204	)		6,557
Defined benefit plans liability adjustment		93,823			(36,539	)		57,284

	$	632,422		$	(231,538	)	$	400,884

For the year ended December 31, 2008
Unrealized losses on AFS investment securities:
Unrealized holding losses	$	(1,001,417	)	$	331,461		$	(669,956	)
Add: transfer of investment securities from AFS to HTM		86,943			(20,972	)		65,971
Less: reclassification adjustment for losses recognized in net income		(180,274	)		10,863			(169,411	)

		(734,200	)		299,626			(434,574	)
Unrealized holding losses on investment securities transferred from AFS to HTM:
Unrealized holding losses transferred		(86,943	)		20,972			(65,971	)
Reclassification to income of unrealized holding losses		5,101			(1,818	)		3,283

		(81,842	)		19,154			(62,688	)

Net unrealized losses on investment securities		(816,042	)		318,780			(497,262	)
Cash flow hedges:
Unrealized losses on terminated cash flow hedges		(20,225	)		7,887			(12,338	)
Reclassification to income for amortization of losses on terminated cash flow hedges		25,234			(9,848	)		15,386

		5,009			(1,961	)		3,048
Defined benefit plans liability adjustment		(210,161	)		82,316			(127,845	)

	$	(1,021,194	)	$	399,135		$	(622,059	)

Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)

Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses) as follows:


	Investment			All Other			Cash			Defined
	Securities			Investment			Flow			Benefit
	With OTTI			Securities			Hedges			Plans			Total
	(In thousands)

Balance at January 1, 2008	$	—		$	(59,406	)	$	(8,931	)	$	(46,485	)	$	(114,822	)
Net gain (loss) during 2008		—			(497,262	)		3,048			(127,845	)		(622,059	)

Balance at December 31, 2008		—			(556,668	)		(5,883	)		(174,330	)		(736,881	)
Net gain (loss) during 2009		(76,772	)		413,815			6,557			57,284			400,884

Balance at December 31, 2009		(76,772	)		(142,853	)		674			(117,046	)		(335,997	)
Net gain (loss) during 2010		(10,281	)		145,185			(281	)		(3,846	)		130,777

Balance at December 31, 2010	$	(87,053	)	$	2,332		$	393		$	(120,892	)	$	(205,220	)

Other income and other expense (Tables)

12 Months Ended

Dec. 31, 2010

Other income and other expense (Tables) [Abstract]

Other income and other expense


	Year Ended December 31
	2010		2009		2008
	(In thousands)

Other income:
Bank owned life insurance	$	50,483	$	49,152	$	49,006
Credit-related fee income		62,294		56,150		55,293
Letter of credit fees		49,762		44,005
Other expense:
Professional services		128,629		117,523		112,632
Amortization of capitalized servicing rights		56,582		62,268		65,722
Advertising and promotion		41,869		39,364

Derivative financial instruments (Tables)

12 Months Ended

Dec. 31, 2010

Derivative financial instruments (Tables) [Abstract]

Information about interest rate swap agreements

Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows:


	Notional		Average		Weighted-Average Rate						Estimated Fair
	Amount		Maturity		Fixed			Variable			Value Gain
	(In thousands)		(In years)								(In thousands)

December 31, 2010
Fair value hedges:
Fixed rate long-term borrowings(a)	$	900,000		6.4		6.07	%		1.84	%	$	96,637

December 31, 2009
Fair value hedges:
Fixed rate time deposits(a)	$	25,000		3.7		5.30	%		0.34	%	$	503
Fixed rate long-term borrowings(a)		1,037,241		6.5		6.33			2.12			53,983

	$	1,062,241		6.4		6.30	%		2.07	%	$	54,486


(a)		Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate.

Information about fair values of derivative instruments in consolidated balance sheet


	Asset Derivatives				Liability Derivatives
	Fair Value				Fair Value
	December 31				December 31
	2010		2009		2010		2009
	(In thousands)

Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements(a)	$	96,637	$	54,486	$	—	$	—
Commitments to sell real estate loans(a)		4,880		6,009		1,062		171

		101,517		60,495		1,062		171
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale(a)		2,827		4,428		583		4,508
Commitments to sell real estate loans(a)		10,322		13,293		1,962		1,360
Trading:
Interest rate contracts(b)		345,632		317,651		321,461		290,104
Foreign exchange and other option and futures contracts(b)		11,267		11,908		11,761		12,094

		370,048		347,280		335,767		308,066

Total derivatives	$	471,565	$	407,775	$	336,829	$	308,237


(a)		Asset derivatives are reported in other assets and liability derivatives are reported in other liabilities.

(b)		Asset derivatives are reported in trading account assets and liability derivatives are reported in other liabilities.

Information About Fair Values Of Derivative Instruments In Statement Of Income Text Block


	Amount of Unrealized Gain (Loss) Recognized
	Year Ended						Year Ended					Year Ended
	December 31, 2010						December 31, 2009					December 31, 2008
	Derivative			Hedged Item			Derivative			Hedged Item		Derivative			Hedged Item
	(In thousands)

Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate time deposits(a)	$	(503	)	$	503		$	(1,797	)	$	1,789	$	883		$	(895	)
Fixed rate long-term borrowings(a)		41,628			(39,802	)		(91,093	)		85,679		127,563			(121,898	)

Total	$	41,125		$	(39,299	)	$	(92,890	)	$	87,468	$	128,446		$	(122,793	)

Derivatives not designated as hedging instruments
Trading:
Interest rate contracts(b)	$	3,760					$	(3,622	)			$	6,529
Foreign exchange and other option and futures contracts(b)		(307	)					337					(1,209	)

Total	$	3,453					$	(3,285	)			$	5,320


(a)		Reported as other revenues from operations.

(b)		Reported as trading account and foreign exchange gains.

Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2010

Fair value measurements (Tables) [Abstract]

Assets and liabilities measured at estimated fair value on a recurring basis

The following tables present assets and liabilities at December 31, 2010 and December 31, 2009 measured at estimated fair value on a recurring basis:


	Fair Value
	Measurements at
	December 31,
	2010		Level 1(a)		Level 2(a)		Level 3
			(In thousands)

Trading account assets	$	523,834		53,032		470,802		—
Investment securities available for sale:
U.S. Treasury and federal agencies		63,434		—		63,434		—
Obligations of states and political subdivisions		60,425		—		60,425		—
Mortgage-backed securities:
Government issued or guaranteed		3,306,241		—		3,306,241		—
Privately issued residential		1,435,561		—		—		1,435,561
Privately issued commercial		22,407		—		—		22,407
Collateralized debt obligations		110,756		—		—		110,756
Other debt securities		298,900		—		298,900		—
Equity securities		115,768		106,872		8,896		—

		5,413,492		106,872		3,737,896		1,568,724

Real estate loans held for sale		544,567		—		544,567		—
Other assets(b)		114,666		—		111,839		2,827

Total assets	$	6,596,559		159,904		4,865,104		1,571,551

Trading account liabilities	$	333,222		—		333,222		—
Other liabilities(b)		3,607		—		3,024		583

Total liabilities	$	336,829		—		336,246		583


	Fair Value
	Measurements at
	December 31,
	2009		Level 1		Level 2		Level 3
			(In thousands)

Trading account assets	$	386,984		40,836		346,148		—
Investment securities available for sale:
U.S. Treasury and federal agencies		104,686		—		104,686		—
Obligations of states and political subdivisions		62,923		—		62,923		—
Mortgage-backed securities:
Government issued or guaranteed		3,902,282		—		3,902,282		—
Privately issued residential		2,064,904		—		—		2,064,904
Privately issued commercial		25,166		—		—		25,166
Collateralized debt obligations		115,346		—		—		115,346
Other debt securities		268,201		—		267,781		420
Equity securities		160,870		145,817		15,053		—

		6,704,378		145,817		4,352,725		2,205,836

Real estate loans held for sale		652,761		—		652,761		—
Other assets(b)		78,216		—		73,788		4,428

Total assets	$	7,822,339		186,653		5,425,422		2,210,264

Trading account liabilities	$	302,198		5,577		296,621		—
Other liabilities(b)		6,039		—		1,531		4,508

Total liabilities	$	308,237		5,577		298,152		4,508


(a)		There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the year ended December 31, 2010.

(b)		Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 3).

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the year ended December 31, 2010 were as follows:


																	Changes in
																	Unrealized Gains
				Total Gains (Losses)													(Losses) Included
				Realized/Unrealized													in Earnings Related
							Included in										to Assets Still
	Balance-						Other					Transfer in			Balance-		Held at
	January 1,			Included			Comprehensive					and/or out of			December 31,		December 31,
	2010			in Earnings			Income		Settlements			Level 3(c)			2010		2010
									(In thousands)

Investment securities available for sale:
Privately issued residential mortgage-backed securities	$	2,064,904			(63,503	)(a)		176,140		(386,732	)		(355,248	)(d)		1,435,561		(63,503	)(a)
Privately issued commercial mortgage-backed securities		25,166			—			5,462		(8,221	)		—			22,407		—
Collateralized debt obligations		115,346			(5,703	)(a)		2,887		(1,774	)		—			110,756		(5,703	)(a)
Other debt securities		420			—			35		—			(455	)		—		—

		2,205,836			(69,206	)		184,524		(396,727	)		(355,703	)		1,568,724		(69,206	)
Other assets and other liabilities		(80	)		95,661	(b)		—		—			(93,337	)		2,244		2,153	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the year ended December 31, 2009 were as follows:


																		Changes in
																		Unrealized Gains
			Total Gains (Losses)															(Losses) Included
			Realized/Unrealized															in Earnings Related
						Included in												to Assets Still
	Balance-					Other			Purchases, Sales,			Transfer in			Balance-			Held at
	January 1,		Included			Comprehensive			Issuances &			and/or out of			December 31,			December 31,
	2009		in Earnings			Income			Settlements			Level 3(c)			2009			2009
									(In thousands)

Investment securities available for sale:
U.S. Treasury and federal agencies	$	5,532		—			—			—			(5,532	)		—			—
Obligations of states and political subdivisions		38		—			224			(9	)		(253	)		—			—
Government issued or guaranteed mortgage-backed securities		84,544		—			—			—			(84,544	)		—			—
Privately issued residential mortgage-backed securities		2,326,554		(128,374	)(a)		421,150			(554,426	)		—			2,064,904			(128,374	)(a)
Privately issued commercial mortgage-backed securities		41,046		—			(6,853	)		(9,027	)		—			25,166			—
Collateralized debt obligations		2,496		(9,568	)(a)		19,770			102,648			—			115,346			(9,923	)(a)
Other debt securities		—		—			145			725			(450	)		420			—
Equity securities		2,302		—			2			(12	)		(2,292	)		—			—

		2,462,512		(137,942	)		434,438			(460,101	)		(93,071	)		2,205,836			(138,297	)
Other assets and other liabilities		8,266		34,400	(b)		—			—			(42,746	)		(80	)		2,465	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the year ended December 31, 2008 were as follows:


																	Changes in
																	Unrealized Gains
			Total Gains (Losses)														(Losses) Included
			Realized/Unrealized														in Earnings Related
						Included in											to Assets Still
	Balance-					Other			Purchases, Sales,			Transfer in			Balance-		Held at
	January 1,		Included			Comprehensive			Issuances &			and/or out of			December 31,		December 31,
	2008		in Earnings			Income			Settlements			Level 3			2008		2008
									(In thousands)

Investment securities available for sale:
U.S. Treasury and federal agencies	$	5,696		—			364			(528	)		—			5,532		—
Obligations of states and political subdivisions		50		—			(5	)		(7	)		—			38		—
Government issued or guaranteed mortgage-backed securities		118,992		—			878			(6,390	)		(28,936	)		84,544		—
Privately issued residential and commercial mortgage-backed securities		1,159,644		(12,483	)(a)		(408,211	)		(236,669	)		1,865,319			2,367,600		(12,483	)(a)
Collateralized debt obligations		27,115		(11,413	)(a)		(13,232	)		—			26			2,496		(11,413	)(a)
Equity securities		2,324		—			(9	)		(13	)		—			2,302		—

		1,313,821		(23,896	)		(420,215	)		(243,607	)		1,836,409			2,462,512		(23,896	)
Other assets and other liabilities		2,654		31,356	(b)		—			—			(25,744	)		8,266		8,266	(b)


(a)		Reported as an other-than-temporary impairment loss in the consolidated statement of income or as gain (loss) on bank investment securities.

(b)		Reported as mortgage banking revenues in the consolidated statement of income and includes the fair value of commitment issuances and expirations.

(c)		The Company’s policy for transfers between fair value levels is to recognize the transfer as of the actual date of the event or change in circumstances that caused the transfer.

(d)		As a result of the Company’s adoption of new accounting rules governing the consolidation of variable interest entities, effective January 1, 2010 the Company derecognized $355 million of available-for-sale investment securities previously classified as Level 3 measurements. Further information regarding the Company’s adoption of new accounting requirements is included in note 19.

Carrying amounts and estimated fair value for financial instrument assets(liabilities)

The carrying amounts and estimated fair value for financial instrument assets (liabilities) are presented in the following table:


	December 31, 2010						December 31, 2009
	Carrying			Calculated			Carrying			Calculated
	Amount			Estimate			Amount			Estimate
				(In thousands)

Financial assets:
Cash and cash equivalents	$	933,755		$	933,755		$	1,246,342		$	1,246,342
Interest-bearing deposits at banks		101,222			101,222			133,335			133,335
Trading account assets		523,834			523,834			386,984			386,984
Investment securities		7,150,540			7,051,454			7,780,609			7,629,485
Loans and leases:
Commercial loans and leases		13,390,610			13,135,569			13,479,447			13,090,206
Commercial real estate loans		21,183,161			20,840,346			20,949,931			20,426,273
Residential real estate loans		5,928,056			5,699,028			5,463,463			5,058,763
Consumer loans		11,488,555			11,178,583			12,043,845			11,575,525
Allowance for credit losses		(902,941	)		—			(878,022	)		—

Loans and leases, net		51,087,441			50,853,526			51,058,664			50,150,767
Accrued interest receivable		202,182			202,182			214,692			214,692
Financial liabilities:
Noninterest-bearing deposits	$	(14,557,568	)	$	(14,557,568	)	$	(13,794,636	)	$	(13,794,636	)
Savings deposits and NOW accounts		(27,824,630	)		(27,824,630	)		(25,073,269	)		(25,073,269	)
Time deposits		(5,817,170	)		(5,865,779	)		(7,531,495	)		(7,592,214	)
Deposits at Cayman Islands office		(1,605,916	)		(1,605,916	)		(1,050,438	)		(1,050,438	)
Short-term borrowings		(947,432	)		(947,432	)		(2,442,582	)		(2,442,582	)
Long-term borrowings		(7,840,151	)		(7,937,397	)		(10,240,016	)		(9,822,153	)
Accrued interest payable		(71,954	)		(71,954	)		(94,838	)		(94,838	)
Trading account liabilities		(333,222	)		(333,222	)		(302,198	)		(302,198	)
Other financial instruments:
Commitments to originate real estate loans for sale	$	2,244		$	2,244		$	(80	)	$	(80	)
Commitments to sell real estate loans		12,178			12,178			17,771			17,771
Other credit-related commitments		(74,426	)		(74,426	)		(55,954	)		(55,954	)
Interest rate swap agreements used for interest rate risk management		96,637			96,637			54,486			54,486

Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2010

Commitments and Contingencies (Tables) [Abstract]

Company's significant commitments

The following table presents the Company’s significant commitments. Certain of these commitments are not included in the Company’s consolidated balance sheet.


	December 31
	2010		2009
	(In thousands)

Commitments to extend credit
Home equity lines of credit	$	6,281,366	$	6,482,987
Commercial real estate loans to be sold		72,930		180,498
Other commercial real estate and construction		1,672,006		1,360,805
Residential real estate loans to be sold		161,583		631,090
Other residential real estate		151,111		127,788
Commercial and other		8,332,199		7,155,188
Standby letters of credit		3,917,318		3,828,586
Commercial letters of credit		76,962		66,377
Financial guarantees and indemnification contracts		1,609,944		1,633,549
Commitments to sell real estate loans		734,696		1,239,001

Minimum lease payments under noncancellable operating leases

Minimum lease payments under noncancellable operating leases are summarized in the following table:


	(In thousands)

Year ending December 31:
2011	$	78,325
2012		75,033
2013		60,712
2014		50,493
2015		42,741
Later years		137,592

	$	444,896

Segment information (Tables)

12 Months Ended

Dec. 31, 2010

Segment information (Tables) [Abstract]

Information about the Company's segments

Information about the Company’s segments is presented in the accompanying table. Income statement amounts are in thousands of dollars. Balance sheet amounts are in millions of dollars.


							For the Years Ended December 31, 2010, 2009 and 2008
	Business Banking						Commercial Banking						Commercial Real Estate						Discretionary Portfolio
	2010		2009		2008		2010		2009		2008		2010		2009		2008		2010			2009			2008

Net interest income(a)	$	315,407	$	321,208	$	288,519	$	582,231	$	531,592	$	433,238	$	384,147	$	346,513	$	287,727	$	23,347		$	137,507		$	144,856
Noninterest income		95,443		89,043		86,293		217,368		192,979		197,515		85,200		65,224		63,288		(34,383	)		(100,507	)		(140,063	)

		410,850		410,251		374,812		799,599		724,571		630,753		469,347		411,737		351,015		(11,036	)		37,000			4,793
Provision for credit losses		74,443		41,923		33,529		47,675		107,871		77,104		45,781		84,614		15,507		55,810			83,139			68,766
Amortization of core deposit and other intangible assets		—		—		—		—		—		—		—		—		—		—			—			—
Depreciation and other amortization		276		857		757		552		628		559		7,339		5,934		4,588		3,733			5,506			5,342
Other noninterest expense		169,878		158,042		137,780		219,471		210,180		191,785		124,674		103,124		89,151		26,256			27,070			45,892

Income (loss) before taxes		166,253		209,429		202,746		531,901		405,892		361,305		291,553		218,065		241,769		(96,835	)		(78,715	)		(115,207	)
Income tax expense (benefit)		67,687		85,387		82,686		217,734		166,459		148,136		88,466		62,711		77,478		(58,269	)		(50,692	)		(67,142	)

Net income (loss)	$	98,566	$	124,042	$	120,060	$	314,167	$	239,433	$	213,169	$	203,087	$	155,354	$	164,291	$	(38,566	)	$	(28,023	)	$	(48,065	)

Average total assets (in millions)	$	4,843	$	4,869	$	4,452	$	15,461	$	15,399	$	14,981	$	13,194	$	12,842	$	11,394	$	14,690		$	13,763		$	14,179

Capital expenditures (in millions)	$	1	$	1	$	2	$	3	$	—	$	1	$	1	$	1	$	—	$	—		$	—		$	—


	For the Years Ended December 31, 2010, 2009 and 2008
	Residential Mortgage Banking								Retail Banking						All Other									Total
	2010		2009			2008			2010		2009		2008		2010			2009			2008			2010		2009		2008

Net interest income(a)	$	71,599	$	78,865		$	66,051		$	839,828	$	878,520	$	830,022	$	50,967		$	(238,457	)	$	(110,617	)	$	2,267,526	$	2,055,748	$	1,939,796
Noninterest income		195,540		226,659			171,774			380,015		372,821		343,666		168,917			201,887			216,506			1,108,100		1,048,106		938,979

		267,139		305,524			237,825			1,219,843		1,251,341		1,173,688		219,884			(36,570	)		105,889			3,375,626		3,103,854		2,878,775
Provision for credit losses		49,110		97,816			104,995			109,978		130,509		98,586		(14,797	)		58,128			13,513			368,000		604,000		412,000
Amortization of core deposit and other intangible assets		—		—			—			—		—		—		58,103			64,255			66,646			58,103		64,255		66,646
Depreciation and other amortization		46,171		51,552			56,666			31,350		31,299		28,523		34,838			30,890			22,709			124,259		126,666		119,144
Other noninterest expense		160,131		185,829			164,102			698,540		689,314		624,834		333,525			416,083			287,662			1,732,475		1,789,642		1,541,206

Income (loss) before taxes		11,727		(29,673	)		(87,938	)		379,975		400,219		421,745		(191,785	)		(605,926	)		(284,641	)		1,092,789		519,291		739,779
Income tax expense (benefit)		587		(16,629	)		(39,758	)		154,680		162,957		171,740		(114,257	)		(270,793	)		(189,248	)		356,628		139,400		183,892

Net income (loss)	$	11,140	$	(13,044	)	$	(48,180	)	$	225,295	$	237,262	$	250,005	$	(77,528	)	$	(335,133	)	$	(95,393	)	$	736,161	$	379,891	$	555,887

Average total assets (in millions)	$	2,217	$	2,552		$	2,660		$	12,079	$	12,024	$	11,356	$	5,896		$	6,023		$	6,110		$	68,380	$	67,472	$	65,132

Capital expenditures (in millions)	$	1	$	—		$	—		$	33	$	39	$	38	$	31		$	18		$	31		$	70	$	59	$	72


(a)		Net interest income is the difference between actual taxable-equivalent interest earned on assets and interest paid on liabilities by a segment and a funding charge (credit) based on the Company’s internal funds transfer pricing methodology. Segments are charged a cost to fund any assets (e.g. loans) and are paid a funding credit for any funds provided (e.g. deposits). The taxable-equivalent adjustment aggregated $24,023,000 in 2010, $21,829,000 in 2009 and $21,861,000 in 2008 and is eliminated in “All Other” net interest income and income tax expense (benefit).

Intersegment activity eliminated in arriving at consolidated totals included in the All Other category

The amount of intersegment activity eliminated in arriving at consolidated totals was included in the “All Other” category as follows:


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Revenues	$	(41,508	)	$	(47,114	)	$	(42,738	)
Expenses		(15,527	)		(19,164	)		(19,198	)
Income taxes (benefit)		(10,572	)		(11,373	)		(9,578	)
Net income (loss)		(15,409	)		(16,577	)		(13,962	)

Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2010

Regulatory Matters (Tables) [Abstract]

Capital ratios and amounts of the Company and its banking subsidiaries

The capital ratios and amounts of the Company and its banking subsidiaries as of December 31, 2010 and 2009 are presented below:


	M&T						M&T
	(Consolidated)			M&T Bank			Bank, N.A.
	(Dollars in thousands)

December 31, 2010:
Tier 1 capital
Amount	$	6,051,724		$	5,406,330		$	190,151
Ratio(a)		9.47	%		8.62	%		26.80	%
Minimum required amount(b)		2,555,215			2,508,897			28,386
Total capital
Amount		8,352,643			7,686,799			196,140
Ratio(a)		13.08	%		12.26	%		27.64	%
Minimum required amount(b)		5,110,431			5,017,795			56,772
Leverage
Amount		6,051,724			5,406,330			190,151
Ratio(c)		9.33	%		8.46	%		22.54	%
Minimum required amount(b)		1,946,312			1,916,033			25,307
December 31, 2009:
Tier 1 capital
Amount	$	5,514,093		$	4,988,224		$	188,769
Ratio(a)		8.59	%		7.96	%		18.49	%
Minimum required amount(b)		2,567,323			2,507,700			40,846
Total capital
Amount		7,892,455			7,342,191			193,591
Ratio(a)		12.30	%		11.71	%		18.96	%
Minimum required amount(b)		5,134,646			5,015,399			81,692
Leverage
Amount		5,514,093			4,988,224			188,769
Ratio(c)		8.43	%		7.77	%		19.41	%
Minimum required amount(b)		1,961,213			1,925,558			29,179


(a)		The ratio of capital to risk-weighted assets, as defined by regulation.
(b)		Minimum amount of capital to be considered adequately capitalized, as defined by regulation.
(c)		The ratio of capital to average assets, as defined by regulation.

Parent company fnancial statements (Tables)

12 Months Ended

Dec. 31, 2010

Parent company financial statements (Tables) [Abstract]

Consolidated financial statements of parent company

Condensed Balance Sheet


	December 31
	2010		2009
	(In thousands)

Assets
Cash in subsidiary bank	$	1,784	$	1,455
Due from consolidated bank subsidiaries
Money-market savings		481,340		327,029
Current income tax receivable		2,664		5,037
Other		—		55

Total due from consolidated bank subsidiaries		484,004		332,121
Investments in consolidated subsidiaries
Banks		9,048,703		8,559,692
Other		30,978		29,925
Investments in unconsolidated subsidiaries (note 19)		34,257		34,424
Investment in Bayview Lending Group LLC		219,800		245,568
Other assets		88,976		93,506

Total assets	$	9,908,502	$	9,296,691


Liabilities
Due to consolidated bank subsidiaries	$	20	$	—
Accrued expenses and other liabilities		73,283		68,004
Long-term borrowings		1,477,504		1,475,780

Total liabilities		1,550,807		1,543,784
Shareholders’ equity		8,357,695		7,752,907

Total liabilities and shareholders’ equity	$	9,908,502	$	9,296,691

Condensed Statement of Income


	Year Ended December 31
	2010			2009			2008
	(In thousands, except per share)

Income
Dividends from consolidated bank subsidiaries	$	500,000		$	—		$	—
Equity in earnings of Bayview Lending Group LLC		(25,768	)		(25,898	)		(37,453	)
Other-than-temporary impairment losses		(11,993	)		—			—
Other income		6,558			10,670			2,985

Total income		468,797			(15,228	)		(34,468	)

Expense
Interest on long-term borrowings		91,073			93,331			101,534
Other expense		7,447			5,427			2,798

Total expense		98,520			98,758			104,332

Income (loss) before income taxes and equity in undistributed income of subsidiaries		370,277			(113,986	)		(138,800	)
Income tax credits		48,416			42,740			51,085

Income (loss) before equity in undistributed income of subsidiaries		418,693			(71,246	)		(87,715	)

Equity in undistributed income of subsidiaries
Net income of subsidiaries		817,468			451,137			643,602
Less: dividends received		(500,000	)		—			—

Equity in undistributed income of subsidiaries		317,468			451,137			643,602

Net income	$	736,161		$	379,891		$	555,887

Net income per common share
Basic	$	5.72		$	2.90		$	5.04
Diluted		5.69			2.89			5.01

Condensed Statement of Cash Flows


	Year Ended December 31
	2010			2009			2008
	(In thousands)

Cash flows from operating activities
Net income	$	736,161		$	379,891		$	555,887
Adjustments to reconcile net income to net cash provided by operating activities
Equity in undistributed income of subsidiaries		(317,468	)		(451,137	)		(643,602	)
Provision for deferred income taxes		2,237			291			16,653
Net change in accrued income and expense		43,567			14,589			46,884

Net cash provided (used) by operating activities		464,497			(56,366	)		(24,178	)

Cash flows from investing activities
Proceeds from sales of investment securities		2,591			—			15,808
Proceeds from maturities of investment securities		1,150			6,600			17,120
Purchases of investment securities		(2,225	)		(1,855	)		(43,072	)
Investment in subsidiary		—			(120,000	)		—
Proceeds from repayment of advances to subsidiaries		—			200,000			—
Other, net		1,033			15,088			(8,790	)

Net cash provided (used) by investing activities		2,549			99,833			(18,934	)

Cash flows from financing activities
Proceeds from long-term borrowings		—			—			350,010
Payments on long-term borrowings		—			(111,046	)		(20,661	)
Dividends paid — common		(335,303	)		(325,706	)		(308,501	)
Dividends paid — preferred		(40,225	)		(31,946	)		—
Proceeds from subsidiary for issuance of common stock to defined benefit pension plan		—			44,289			—
Proceeds from issuance of preferred stock and warrants		—			—			600,000
Other, net		63,122			12,255			13,184

Net cash provided (used) by financing activities		(312,406	)		(412,154	)		634,032

Net increase (decrease) in cash and cash equivalents		154,640			(368,687	)		590,920
Cash and cash equivalents at beginning of year		328,484			697,171			106,251

Cash and cash equivalents at end of year	$	483,124		$	328,484		$	697,171

Supplemental disclosure of cash flow information
Interest received during the year	$	1,581		$	4,960		$	15,311
Interest paid during the year		87,456			92,247			99,209
Income taxes received during the year		50,882			45,745			62,501

Significant Accounting Policies (Details)	12 Months Ended
Significant Accounting Policies (Details)	Dec. 31, 2010
Significant Accounting Policies (Textuals) [Abstract]
Delinquent period in which principal or interest is charged against income (in days)	90
Delinquent Period in which the net realizable value of the property collateralizing loan is charged off	150
Minimum amortization periods of core deposit and other intangible assets	5
Maximum estimated useful lives of core deposit and other intangible assets (in years)	10

Acquisitions (Details) $ in Thousands	7 Months Ended	12 Months Ended
Acquisitions (Details) $ in Thousands	Dec. 31, 2009 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($) shares	Dec. 31, 2008 USD ($)	Nov. 05, 2010 USD ($)	Nov. 01, 2010 USD ($) shares	Oct. 29, 2010 $ / shares	Aug. 28, 2009 USD ($)	May 23, 2009 USD ($) shares
Fair value of acquired loan portfolio
Contractually required principal and interest at acquisition	$ 3,644,110	$ 2,966,754	$ 3,644,110						$ 5,465,167
Contractual cash flows not expected to be collected									(832,115)
Expected cash flows at acquisition									4,633,052
Interest component of expected cash flows									(595,685)
Basis in acquired loans at acquisition - estimated fair value									4,037,367
Outstanding principal balance and the carrying amount of acquired loans
Outstanding principal balance	3,875,415	3,139,025	3,875,415
Carrying amount	3,644,110	2,966,754	3,644,110						5,465,167
Pro forma information
Total revenues	194,578
Total revenues			3,823,763	$ 4,533,161
Net income	32,686
Net income			292,862	510,897
Summary of merger-related expenses associated with the Bradford and Provident acquisitions
Salaries and employee benefits		999,709	1,001,873	957,086
Equipment and net occupancy		216,064	211,391	188,845
Printing, postage and supplies		33,847	38,216	35,860
Other costs of operations		527,790	568,309	471,870
Total merger-related expenses		771	89,157	3,547
Acquisitions (Textuals) [Abstract]
Assets	68,880,399	68,021,263	68,880,399
Loans and leases	52,306,457	52,315,942	52,306,457
Liabilities	61,127,492	59,663,568	61,127,492
Deposits	47,449,838	49,805,284	47,449,838
Assets under management		66,100,000
Common stock price on October 29, 2010, used to value purchase price and exchange ratio \| $ / shares							74.75
Investment securities	7,780,609	7,150,540	7,780,609
Value Added in Common Equity due to Provident Acquistion									$ 280,000
Additional Acquisitions (Textuals) [Abstract]
After-tax gain on the transaction		17,000	18,000
Pre-tax gain on the transaction		28,000	$ 29,000
Provident common shareholders received given number of shares of M&T common stock in exchange for each share of Provident common stock \| shares									0.171625
Total common shares issued by M&T Bank \| shares			5,838,308
Acquisition date fair value of common shares issued									$ 273,000
Estimated fair value of converted options to purchase the common stock of M& T Bank									1,000
Total purchase price based on the fair value of the acquisition date									274,000
Incremental increase in stockholder's equity by purchasing common stock associated with Series C preferred stock									162,000
Value added in preferred equity due to Provident Acquistion									$ 156,000
Years over which core deposit intangible being amortized									7
Interest income on acquired loans	$ 162,000		$ 105,000
Contractually required principal and interest payments as a percentage of the assets of company									less than .25%
Merger-related expenses		771	89,157	3,547
Merger related expenses net of tax		469	54,000	2,000
Unpaid portion of merger-related expenses		0
Acquired Commercial real estate loans [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases									$ 1,700,000
Acquired Consumer loans [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases									1,400,000
Acquired Commercial Loan [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases									700,000
Acquired Residential real estate loans [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases									300,000
K Bank And Wilmington Trust Corporation Acquisition [Member]
Summary of merger-related expenses associated with the Bradford and Provident acquisitions
Salaries and employee benefits		7
Equipment and net occupancy		44
Printing, postage and supplies		74
Other costs of operations		646
Total merger-related expenses		771
Additional Acquisitions (Textuals) [Abstract]
Merger-related expenses		771
Provident and Bradford acquisition [Member]
Summary of merger-related expenses associated with the Bradford and Provident acquisitions
Salaries and employee benefits			10,030	62
Equipment and net occupancy			2,975	49
Printing, postage and supplies			3,677	367
Other costs of operations			72,475	3,069
Total merger-related expenses			89,157	3,547
Acquisitions (Textuals) [Abstract]
Amount of provident's provision for credit losses			42,000	38,000
Impact of other-than-temporary impairment losses recognized by provident			87,000	121,000
Additional Acquisitions (Textuals) [Abstract]
Merger-related expenses			$ 89,157	$ 3,547
Wilmington Trust Corporation [Member]
Acquisitions (Textuals) [Abstract]
Assets		10,900,000
Loans and leases		7,500,000
Liabilities		10,100,000
Deposits		9,000,000
Assets under management		43,600,000
Affiliates of Wilmington Trust Corporation [Member]
Acquisitions (Textuals) [Abstract]
Assets under management		$ 16,500,000
Wilmington Trust Corporation Pending Aquisition [Member]
Acquisitions (Textuals) [Abstract]
Shares of M&T common stock to be exchanged for each share of Wilmington Trust common stock \| shares						0.051372
Value of pending acquisition stock for stock transaction						$ 351,000
Preferred stock to be assumed as part of Wilmington Trust acquisition						$ 330,000
Bradford acquisition [Member]
Acquisitions (Textuals) [Abstract]
Assets Acquired Total								$ 469,000
Loans and leases								302,000
Liabilities								440,000
Deposits								$ 361,000
K Bank Acquisition [Member]
Acquisitions (Textuals) [Abstract]
Assets Acquired Total					$ 556,000
Loans and leases					154,000
Cash included in assets acquired total					186,000
Liabilities					528,000
Deposits					$ 491,000
Provident acquisition [Member]
Acquisitions (Textuals) [Abstract]
Assets Acquired Total									6,300,000
Loans and leases									4,000,000
Liabilities									5,900,000
Deposits									5,100,000
Investment securities									1,000,000
Value added in shareholder's equity due to Provident acquistion									436,000
Goodwill									332,000
Core deposit intangible									$ 63,000

Investment securities (Details) - USD ($) $ in Thousands	12 Months Ended
Investment securities (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Investment securities available for sale:
Investment securities, available for sale, amortized cost	$ 5,494,377	$ 6,997,009
Gross Unrealized Gains	230,852	190,438
Gross Unrealized Losses	311,737	483,069
Estimated fair value	5,413,492	6,704,378
Investment securities held to maturity:
Amortized Cost for Held-to-maturity	1,324,339	567,607
Gross Unrealized Gains for Held-to-maturity	16,005	1,419
Gross Unrealized Losses for Held-to-maturity	115,091	152,543
Estimated fair value for Held-to-maturity	1,225,253	416,483
Amortized cost and estimated fair value of investment securities
Other securities, Amortized Cost	412,709	508,624
Other securities, Estimated fair value	412,709	508,624
Total for Amortized cost	7,231,425	8,073,240
Total for Gross Unrealized Gains	246,857	191,857
Total for Gross Unrealized losses	426,828	635,612
Total for Estimated fair value	7,051,454	7,629,485
Obligations of states and political subdivisions [Member]
Investment securities held to maturity:
Amortized Cost for Held-to-maturity	191,119	203,825
Gross Unrealized Gains for Held-to-maturity	1,944	1,419
Gross Unrealized Losses for Held-to-maturity	694	1,550
Estimated fair value for Held-to-maturity	192,369	203,694
Other Debt Securities [Member]
Investment securities held to maturity:
Amortized Cost for Held-to-maturity	12,575	11,587
Estimated fair value for Held-to-maturity	12,575	11,587
U.S. Treasury and federal agencies [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	61,772	102,755
Gross Unrealized Gains	1,680	1,988
Gross Unrealized Losses	18	57
Estimated fair value	63,434	104,686
Obligations of states and political subdivisions [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	59,921	61,468
Gross Unrealized Gains	561	1,583
Gross Unrealized Losses	57	128
Estimated fair value	60,425	62,923
Government issued or guaranteed [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	3,146,054	3,777,642
Gross Unrealized Gains	161,298	131,407
Gross Unrealized Losses	1,111	6,767
Estimated fair value	3,306,241	3,902,282
Privately issued residential [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	1,677,064	2,438,353
Gross Unrealized Gains	10,578	9,630
Gross Unrealized Losses	252,081	383,079
Estimated fair value	1,435,561	2,064,904
Privately issued commercial [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	25,357	33,133
Gross Unrealized Losses	2,950	7,967
Estimated fair value	22,407	25,166
Collateralized Debt Obligations [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	95,080	103,159
Gross Unrealized Gains	24,754	23,389
Gross Unrealized Losses	9,078	11,202
Estimated fair value	110,756	115,346
Other Debt Securities [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	310,017	309,514
Gross Unrealized Gains	26,883	16,851
Gross Unrealized Losses	38,000	58,164
Estimated fair value	298,900	268,201
Equity Securities [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	119,112	170,985
Gross Unrealized Gains	5,098	5,590
Gross Unrealized Losses	8,442	15,705
Estimated fair value	$ 115,768	$ 160,870

Investment Securities (Details 2) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Amortized cost and estimated fair value of collateralized mortgage obligations
Collateralized Mortgage Obligations Amortized Cost	$ 2,195,422	$ 3,108,673
Estimated fair value	$ 1,840,046	$ 2,584,067

Investment Securities (Details 3) - USD ($) $ in Thousands	12 Months Ended
Investment Securities (Details 3) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Changes in credit losses associated with debt securities for which other than temporary impairment losses
Estimated credit losses - beginning balance	$ 284,513	$ 155,967
Additions for credit losses not previously recognized	74,288	138,297
Reductions for increases in cash flows	(754)	(1,393)
Reductions for realized losses	(30,135)	(8,358)
Estimated credit losses - ending balance	$ 327,912	$ 284,513

Investment Securities (Details 4) $ in Thousands	Dec. 31, 2010 USD ($)
Debt securities available for sale:
Due in one year or less	$ 40,263
Due after one year through five years	55,144
Due after five years through ten years	22,421
Due after ten years	408,962
Available For Sale Securities Debt Maturities With Single Maturity Date Amortized Cost	526,790
Mortgage-backed securities available for sale	4,848,475
Total	5,375,265
Debt securities available for sale:
Due in one year or less	40,367
Due after one year through five years	57,226
Due after five years through ten years	24,658
Due after ten years	411,264
Available For Sale Securities Debt Maturities With Single Maturity Date Fair Value	533,515
Mortgage-backed securities available for sale	4,764,209
Total	5,297,724
Debt securities held to maturity:
Due in one year or less	28,161
Due after one year through five years	10,628
Due after five years through ten years	138,361
Due after ten years	26,544
Held To Maturity Securities Debt Maturities With Single Maturity Date Net Carrying Amount	203,694
Mortgage-backed securities held to maturity	1,120,645
Total	1,324,339
Debt securities held to maturity:
Due in one year or less	28,353
Due after one year through five years	10,971
Due after five years through ten years	139,162
Due after ten years	26,458
Held To Maturity Securities Debt Maturities With Single Maturity Date Fair Value	204,944
Mortgage-backed securities held to maturity	1,020,309
Total	$ 1,225,253

Investment Securities (Details 5) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	$ 180,622	$ 825,717
Unrealized Losses, Less than 12 months	(12,859)	(21,587)
Estimated fair value, 12 months or more	1,180,395	1,718,177
Unrealized Losses, 12 months or more	(298,878)	(461,482)
U.S. Treasury and federal agencies [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	27,289	6,265
Unrealized Losses, Less than 12 months	(18)	(53)
Estimated fair value, 12 months or more	0	572
Unrealized Losses, 12 months or more	0	(4)
Obligations of states and political subdivisions [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	3,712	9,540
Unrealized Losses, Less than 12 months	(18)	(83)
Estimated fair value, 12 months or more	2,062	3,578
Unrealized Losses, 12 months or more	(39)	(45)
Government issued or guaranteed [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	68,507	685,319
Unrealized Losses, Less than 12 months	(1,079)	(6,460)
Estimated fair value, 12 months or more	2,965	19,379
Unrealized Losses, 12 months or more	(32)	(307)
Privately issued residential [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	61,192	98,312
Unrealized Losses, Less than 12 months	(1,054)	(2,871)
Estimated fair value, 12 months or more	1,057,315	1,504,020
Unrealized Losses, 12 months or more	(251,027)	(380,208)
Privately issued commercial [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	0	0
Unrealized Losses, Less than 12 months	0	0
Estimated fair value, 12 months or more	22,407	25,166
Unrealized Losses, 12 months or more	(2,950)	(7,967)
Collateralized Debt Obligations [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	12,462	13,046
Unrealized Losses, Less than 12 months	(6,959)	(10,218)
Estimated fair value, 12 months or more	6,004	3,598
Unrealized Losses, 12 months or more	(2,119)	(984)
Other Debt Securities [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	2,134	5,786
Unrealized Losses, Less than 12 months	(10)	(174)
Estimated fair value, 12 months or more	88,969	138,705
Unrealized Losses, 12 months or more	(37,990)	(57,990)
Equity Securities [Member]
Investment Securities Continuous Unrealized Loss Position Fair Value [Abstract]
Estimated fair value, Less than 12 months	5,326	7,449
Unrealized Losses, Less than 12 months	(3,721)	(1,728)
Estimated fair value, 12 months or more	673	23,159
Unrealized Losses, 12 months or more	$ (4,721)	$ (13,977)

Investment Securities (Details 6) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Held To Maturity Securities Continuous Unrealized Loss Position [Abstract]
Held to maturity, Estimated fair value, Less than 12 months	$ 76,318	$ 136,032
Held to maturity, Unrealized Losses, Less than 12 months	(638)	(1,492)
Held to maturity, Estimated fair value, 12 months or more	198,607	201,828
Held to maturity, Unrealized Losses, 12 months or more	(114,453)	(151,051)
Investment securities in continuous unrealized loss position
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses	256,940	961,749
Total of investment securities,unrealized losses, less than 12 months	(13,497)	(23,079)
Total of investment securities, fair value, more than 12 months	1,379,002	1,920,005
Total of investment securities,unrealized losses, more than 12 months	(413,331)	(612,533)
Obligations of states and political subdivisions [Member]
Held To Maturity Securities Continuous Unrealized Loss Position [Abstract]
Held to maturity, Estimated fair value, Less than 12 months	76,318	136,032
Held to maturity, Unrealized Losses, Less than 12 months	(638)	(1,492)
Held to maturity, Estimated fair value, 12 months or more	467	626
Held to maturity, Unrealized Losses, 12 months or more	(56)	(58)
Privately Issued Mortgage Backed Securities [Member]
Held To Maturity Securities Continuous Unrealized Loss Position [Abstract]
Held to maturity, Estimated fair value, Less than 12 months	0
Held to maturity, Unrealized Losses, Less than 12 months	0
Held to maturity, Estimated fair value, 12 months or more	198,140	201,202
Held to maturity, Unrealized Losses, 12 months or more	$ (114,397)	$ (150,993)

Investment Securities (Details Textuals)	12 Months Ended
Investment Securities (Details Textuals)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)
Investment securities (Textuals) [Abstract]
Gross realized gains on investment securities	$ 3,549,000	$ 1,629,000	$ 34,730,000
Gross realized losses on investment securities	779,000	464,000	259,000
Other-than-temporary impairment losses	(86,281,000)	(138,297,000)	(182,222,000)
Impairment charges on investments			182,000
Unrealized losses classified in accumulated other comprehensive income	$ 30,000,000	126,000,000
Number of investment securities with aggregate gross unrealized losses	542
Aggregate gross unrealized losses on investment securities	$ 426,828,000	635,612,000
Unrealized losses on privately issued residential mortgage-backed securities	366,000,000
Residential mortgage-backed securities at cost	1,700,000,000
Other debt securities Fair Value	413,000
Unrealized losses on trust preferred securities issued by financial institutions and securities backed by trust preferred securities	47,000,000
Other debt securities fair value	412,709,000	508,624,000
Investment securities pledged to secure debt, carrying value	4,762,579,000
Repledged investment securities	$ 1,937,817,000
Percentage of Share holders equity that is not exceede by investment in security of single Non-US government or government agency	10.00%
Securities Backed By Trust Preferred Securities [Member]
Investment securities (Textuals) [Abstract]
Impairment charges on investments	$ 6,000,000	10,000,000	11,000,000
Collateralized debt obligations backed by trust preferred securities [Member]
Investment securities (Textuals) [Abstract]
Impairment charges on investments	12,000,000
Available for sale securities [Member]
Investment securities (Textuals) [Abstract]
Investment securities pledged to secure debt, carrying value	3,500,392,000
Mortgage-backed securities [Member]
Investment securities (Textuals) [Abstract]
Other-than-temporary impairment losses	68,000,000	$ 128,000,000
Other Debt Securities [Member]
Investment securities (Textuals) [Abstract]
Preferred stock holdings of The Federal National Mortgage Association and The Federal Home Loan Mortgage Corporation	$ 157,000,000
Mortgage backed securities issued by private enterprises [Member]
Investment securities (Textuals) [Abstract]
Impairment charges on investments			18,000,000
Preferred Stock
Investment securities (Textuals) [Abstract]
Impairment charges on investments			153,000,000
Preferred stock holdings of The Federal National Mortgage Association and The Federal Home Loan Mortgage Corporation			$ 162,000

Loans and leases (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Loans
Commercial, financial, etc.	$ 11,999,065	$ 11,913,437
Real estate:
Residential	5,876,413	5,401,932
Commercial	16,977,747	16,345,601
Construction	4,332,618	4,726,570
Consumer	11,483,564	12,041,617
Total loans	50,669,407	50,429,157
Leases
Commercial	1,646,535	1,877,300
Total loans and leases	52,315,942	52,306,457
Unearned discount	(325,560)	(369,771)
Total loans and leases, net of unearned discount	$ 51,990,382	$ 51,936,686

Loans and leases (Details 2) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Direct financings:
Lease payments receivable	$ 1,205,499	$ 1,406,238
Estimated residual value of leased assets	96,441	99,968
Unearned income	(181,771)	(224,768)
Investment in direct financings	1,120,169	1,281,438
Leveraged leases:
Lease payments receivable	164,818	185,679
Estimated residual value of leased assets	179,777	185,415
Unearned income	(63,154)	(74,131)
Investment in leveraged leases	(281,441)	(296,963)
Total investment in leases	(1,401,610)	(1,578,401)
Deferred taxes payable arising from leveraged leases	$ 202,566	$ 212,910

Loans and Leases (Details 3) $ in Thousands	Dec. 31, 2010 USD ($)
Minimum future lease payments to be received from lease financings
2011	$ 316,545
2012	287,561
2013	186,582
2014	126,186
2015	86,833
Later years	366,610
Total	$ 1,370,317

Loans and leases (Details Textuals) - USD ($)	12 Months Ended
Loans and leases (Details Textuals) - USD ($)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Loans And Leases (Textuals) [Abstract]
Nonaccrual loans		$ 1,331,702,000
Renegotiated loans	$ 233,342,000	212,548,000
Interest income that would have been recognized on nonaccrual and renegotiated loans if those loans were accruing interest at their originally contracted terms	90,351,000	99,618,000
Interest on nonaccrual and renegotiated loans included in interest income	$ 40,139,000	43,920,000
Exclusion limit of loans from related party disclosure	Less than 120000
Borrowings by directors and certain officers of M&T and its banking subsidiaries and their associates	$ 105,540,000	106,845,000
New borrowings by directors, certain officers and their associates	2,711,000
Repayments and other reductions of borrowings by directors, certain officers and their associates	4,016,000
Guaranteed amount included in the estimated residual value of leased assets associated with direct financing leases	53,000,000	56,000,000
Lease payments receivable	164,818,000	185,679,000
Estimated residual value	179,777,000	185,415,000
Unearned income	(63,154,000)	(74,131,000)
Charges incurred for reimbursement of loan	30,000,000	10,000,000	$ 4,000,000
Commercial, Financial, Leasing [Member]
Loans And Leases (Textuals) [Abstract]
Commercial mortgage loans held for sale	204,000,000	123,000,000
Mortgage loans serviced for others sold with credit recourse	1,600,000,000
Loans pledged to secure outstanding borrowings from the FHLB of New York	6,700,000,000
Commercial Loans and Leases [Member]
Loans And Leases (Textuals) [Abstract]
Loans pledged to secure outstanding borrowings from the FHLB of New York	6,000,000,000
Home Equity Loans and Lines of Credit [Member]
Loans And Leases (Textuals) [Abstract]
Loans pledged to secure outstanding borrowings from the FHLB of New York	4,400,000,000
Other Consumer Loans [Member]
Loans And Leases (Textuals) [Abstract]
Loans pledged to secure outstanding borrowings from the FHLB of New York	3,200,000,000
Residential Mortgage Loans [Member]
Loans And Leases (Textuals) [Abstract]
Mortgage loans held for sale	341,000,000	530,000,000
Mortgage loans serviced for others sold with credit recourse	13,000,000
Modified loans	308,000,000
Modified loans included in nonaccrual loans	117,000,000
Modified loans classified as renegotiated loans and accruing interest	191,000,000
Loans pledged to secure outstanding borrowings from the FHLB of New York	3,000,000,000
Leveraged leases for which the company is indeminified from loss by AIB [Member]
Loans And Leases (Textuals) [Abstract]
Lease payments receivable	5,000,000	7,000,000
Estimated residual value	26,000,000	31,000,000
Unearned income	$ (4,000,000)	$ (6,000,000)

Allowance for credit losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Allowance for credit losses
Beginning balance	$ 878,022	$ 787,904	$ 759,439
Provision for credit losses	368,000	604,000	412,000
Allowance for Loan and Lease Losses, Loans Sold			(525)
Consolidation of loan securitization trusts	2,752
Net charge-offs
Charge-offs	(412,346)	(556,462)	(420,655)
Recoveries	66,513	42,580	37,645
Net charge-offs	(345,833)	(513,882)	(383,010)
Ending balance	902,941	878,022	$ 787,904
Commercial, Financial, Leasing [Member]
Allowance for credit losses
Provision for credit losses	58,438
Net charge-offs
Charge-offs	(91,650)
Recoveries	26,621
Net charge-offs	(65,029)
Commerical real estate loans [Member]
Allowance for credit losses
Provision for credit losses	159,023
Net charge-offs
Charge-offs	(124,087)
Recoveries	5,856
Net charge-offs	(118,231)
Residential real estate loans [Member]
Allowance for credit losses
Provision for credit losses	52,960
Consolidation of loan securitization trusts	2,752
Net charge-offs
Charge-offs	(71,016)
Recoveries	10,073
Net charge-offs	(60,943)
Consumer loans [Member]
Allowance for credit losses
Provision for credit losses	97,573
Net charge-offs
Charge-offs	(125,593)
Recoveries	23,963
Net charge-offs	(101,630)
Unallocated [Member]
Allowance for credit losses
Beginning balance	70,376
Provision for credit losses	6
Net charge-offs
Ending balance	$ 70,382	$ 70,376

Alllowance for credit losses (Details 1) - USD ($)	12 Months Ended
Alllowance for credit losses (Details 1) - USD ($)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Impaired loans and leases
Recorded Investment, with an allowance recorded	$ 904,504,000	$ 1,077,626,000
Unpaid Principal Balance, with an allowance recorded	1,043,304,000
Related Allowance, with an allowance recorded	213,933,000
Recorded investment, with no related allowance recorded	349,223,000	233,990,000
Unpaid Principal Balance, with no related allowance recorded	433,129,000
Recorded Investment, Total	1,253,727,000	1,311,616,000
Unpaid Principal Balance, Total	1,476,433,000
Related Allowance, Total	213,933,000	244,137,000
Average Recorded Investment	1,238,685,000
Interest Income Recognized, Total	25,395,000	$ 10,224,000	$ 7,222,000
Interest Income Recognized, Cash Basis	12,987,000
Commercial, Financial, Leasing [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	121,744,000
Unpaid Principal Balance, with an allowance recorded	170,888,000
Related Allowance, with an allowance recorded	40,909,000
Recorded investment, with no related allowance recorded	65,827,000
Unpaid Principal Balance, with no related allowance recorded	86,332,000
Recorded Investment, Total	187,571,000
Unpaid Principal Balance, Total	257,220,000
Related Allowance, Total	40,909,000
Average Recorded Investment	266,685,000
Interest Income Recognized, Total	5,027,000
Interest Income Recognized, Cash Basis	5,003,000
Commerical real estate loans [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	110,975,000
Unpaid Principal Balance, with an allowance recorded	140,015,000
Related Allowance, with an allowance recorded	17,393,000
Recorded investment, with no related allowance recorded	101,939,000
Unpaid Principal Balance, with no related allowance recorded	116,316,000
Recorded Investment, Total	212,914,000
Unpaid Principal Balance, Total	256,331,000
Related Allowance, Total	17,393,000
Average Recorded Investment	233,429,000
Interest Income Recognized, Total	1,990,000
Interest Income Recognized, Cash Basis	1,748,000
Residential builder and developer [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	263,545,000
Unpaid Principal Balance, with an allowance recorded	295,031,000
Related Allowance, with an allowance recorded	78,597,000
Recorded investment, with no related allowance recorded	100,799,000
Unpaid Principal Balance, with no related allowance recorded	124,383,000
Recorded Investment, Total	364,344,000
Unpaid Principal Balance, Total	419,414,000
Related Allowance, Total	78,597,000
Average Recorded Investment	322,249,000
Interest Income Recognized, Total	1,723,000
Interest Income Recognized, Cash Basis	753,000
Other commercial construction [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	80,934,000
Unpaid Principal Balance, with an allowance recorded	85,432,000
Related Allowance, with an allowance recorded	22,067,000
Recorded investment, with no related allowance recorded	46,656,000
Unpaid Principal Balance, with no related allowance recorded	50,496,000
Recorded Investment, Total	127,590,000
Unpaid Principal Balance, Total	135,928,000
Related Allowance, Total	22,067,000
Average Recorded Investment	64,436,000
Interest Income Recognized, Total	462,000
Interest Income Recognized, Cash Basis	449,000
Residential real estate excluding Alt-A [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	73,006,000
Unpaid Principal Balance, with an allowance recorded	85,279,000
Related Allowance, with an allowance recorded	3,375,000
Recorded investment, with no related allowance recorded	5,035,000
Unpaid Principal Balance, with no related allowance recorded	7,723,000
Recorded Investment, Total	78,041,000
Unpaid Principal Balance, Total	93,002,000
Related Allowance, Total	3,375,000
Average Recorded Investment	62,104,000
Interest Income Recognized, Total	3,079,000
Interest Income Recognized, Cash Basis	1,793,000
Residential Alt-A [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	180,665,000
Unpaid Principal Balance, with an allowance recorded	191,445,000
Related Allowance, with an allowance recorded	36,000,000
Recorded investment, with no related allowance recorded	28,967,000
Unpaid Principal Balance, with no related allowance recorded	47,879,000
Recorded Investment, Total	209,632,000
Unpaid Principal Balance, Total	239,324,000
Related Allowance, Total	36,000,000
Average Recorded Investment	220,589,000
Interest Income Recognized, Total	8,397,000
Interest Income Recognized, Cash Basis	1,758,000
Home equity lines and loans [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	11,799,000
Unpaid Principal Balance, with an allowance recorded	13,378,000
Related Allowance, with an allowance recorded	2,227,000
Recorded Investment, Total	11,799,000
Unpaid Principal Balance, Total	13,378,000
Related Allowance, Total	2,227,000
Average Recorded Investment	11,807,000
Interest Income Recognized, Total	790,000
Interest Income Recognized, Cash Basis	202,000
Automobile [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	58,858,000
Unpaid Principal Balance, with an allowance recorded	58,858,000
Related Allowance, with an allowance recorded	12,597,000
Recorded Investment, Total	58,858,000
Unpaid Principal Balance, Total	58,858,000
Related Allowance, Total	12,597,000
Average Recorded Investment	54,221,000
Interest Income Recognized, Total	3,684,000
Interest Income Recognized, Cash Basis	1,233,000
Other [Member]
Impaired loans and leases
Recorded Investment, with an allowance recorded	2,978,000
Unpaid Principal Balance, with an allowance recorded	2,978,000
Related Allowance, with an allowance recorded	768,000
Recorded Investment, Total	2,978,000
Unpaid Principal Balance, Total	2,978,000
Related Allowance, Total	768,000
Average Recorded Investment	3,165,000
Interest Income Recognized, Total	243,000
Interest Income Recognized, Cash Basis	$ 48,000

Allowance for credit losses (Details 2) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Summary of Loan grades
Total loans and leases	$ 52,315,942	$ 52,306,457
Commercial, Financial, Leasing [Member]
Summary of Loan grades
Total loans and leases	13,390,610
Commerical real estate loans [Member]
Summary of Loan grades
Total loans and leases	16,931,790
Residential builder and developer [Member]
Summary of Loan grades
Total loans and leases	1,351,490
Other commercial construction [Member]
Summary of Loan grades
Total loans and leases	2,899,881
Pass [Member] \| Commercial, Financial, Leasing [Member]
Summary of Loan grades
Total loans and leases	12,371,138
Pass [Member] \| Commerical real estate loans [Member]
Summary of Loan grades
Total loans and leases	15,831,104
Pass [Member] \| Residential builder and developer [Member]
Summary of Loan grades
Total loans and leases	693,110
Pass [Member] \| Other commercial construction [Member]
Summary of Loan grades
Total loans and leases	2,253,589
Criticized Accrual [Member] \| Commercial, Financial, Leasing [Member]
Summary of Loan grades
Total loans and leases	832,733
Criticized Accrual [Member] \| Commerical real estate loans [Member]
Summary of Loan grades
Total loans and leases	891,655
Criticized Accrual [Member] \| Residential builder and developer [Member]
Summary of Loan grades
Total loans and leases	311,932
Criticized Accrual [Member] \| Other commercial construction [Member]
Summary of Loan grades
Total loans and leases	519,651
Criticized Nonaccrual [Member] \| Commercial, Financial, Leasing [Member]
Summary of Loan grades
Total loans and leases	186,739
Criticized Nonaccrual [Member] \| Commerical real estate loans [Member]
Summary of Loan grades
Total loans and leases	209,031
Criticized Nonaccrual [Member] \| Residential builder and developer [Member]
Summary of Loan grades
Total loans and leases	346,448
Criticized Nonaccrual [Member] \| Other commercial construction [Member]
Summary of Loan grades
Total loans and leases	$ 126,641

Allowance for credit losses (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Allowance for credit losses (Textuals) [Abstract]
Investment in loans considered impaired	$ 1,253,727,000	$ 1,311,616,000
Investment in loans considered impaired without related valuation allowance for impairment	349,223,000	233,990,000
Investment in loans considered impaired with related valuation allowance for impairment	904,504,000	1,077,626,000
Related Allowance	213,933,000	244,137,000
Recorded Investment		986,164,000	$ 371,298,000
Interest Income Recognized, Total	$ 25,395,000	$ 10,224,000	$ 7,222,000

Premises and equipment (Details) - USD ($)	12 Months Ended
Premises and equipment (Details) - USD ($)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Premises and equipment
Land	$ 64,728,000	$ 63,961,000
Leasehold improvements	172,638,000	165,110,000
Premises and equipment, gross	886,399,000	846,804,000
Less: accumulated depreciation and amortization	450,562,000	410,959,000
Premises and equipment, net	435,837,000	435,845,000
Premises and equipment (Textuals) [Abstract]
Net lease expense for all operating leases	94,646,000	89,030,000	$ 73,886,000
Owned Assets [Member]
Premises and equipment
Buildings	280,288,000	271,181,000
Furniture and equipment	366,227,000	345,421,000
Less: accumulated depreciation and amortization	449,571,000	410,218,000
Capital Leases [Member]
Premises and equipment
Buildings	1,131,000	1,131,000
Furniture and equipment	1,387,000	0
Less: accumulated depreciation and amortization	$ 991,000	$ 741,000

Capitalized Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Changes in capitalized servicing assets
Beginning balance	$ 174,302	$ 191,359	$ 195,959
Originations	44,406	43,451	28,371
Purchases	593	972	24,296
Assumed in loan securitizations (note 19)		788	8,455
Consolidation of loan securitization trusts (note 19)	(1,843)
Amortization	(56,582)	(62,268)	(65,722)
Amortized value, ending balance	160,876	174,302	191,359
Valuation allowance		(50)	(22,000)
Ending balance, net	160,876	174,252	169,359
Residential Mortgage Loan [Member]
Changes in capitalized servicing assets
Beginning balance	101,155	106,979	118,763
Originations	27,430	31,034	17,765
Purchases	593	972	3,322
Assumed in loan securitizations (note 19)		788	8,455
Consolidation of loan securitization trusts (note 19)	(1,843)
Amortization	(35,269)	(38,618)	(41,326)
Amortized value, ending balance	92,066	101,155	106,979
Valuation allowance		(50)	(22,000)
Ending balance, net	92,066	101,105	84,979
Small Balance Commercial Mortgage Loans [Member]
Changes in capitalized servicing assets
Beginning balance	40,251	58,044	56,956
Purchases			20,974
Amortization	(14,054)	(17,793)	(19,886)
Amortized value, ending balance	26,197	40,251	58,044
Ending balance, net	26,197	40,251	58,044
Commercial Loans [Member]
Changes in capitalized servicing assets
Beginning balance	32,896	26,336	20,240
Originations	16,976	12,417	10,606
Purchases	0
Assumed in loan securitizations (note 19)	0
Amortization	(7,259)	(5,857)	(4,510)
Amortized value, ending balance	42,613	32,896	26,336
Ending balance, net	$ 42,613	$ 32,896	$ 26,336

Capitalized Servicing Assets (Details 1)	12 Months Ended
Capitalized Servicing Assets (Details 1)	Dec. 31, 2010 USD ($)
Residential Mortgage Loan [Member]
Economic assumptions used to determine the fair value of capitalized servicing rights and the sensitivity of value to changes in the assumptions
Weighted-average prepayment speeds	13.60%
Impact on fair value of 10% adverse change, prepayment speeds	$ (8,017,000)
Impact on fair value of 20% adverse change, prepayment speeds	$ (15,254,000)
Weighted-average OAS	7.48%
Impact on fair value of 10% adverse change, OAS	$ (1,188,000)
Impact on fair value of 20% adverse change, OAS	$ (4,047,000)
Small Balance Commercial Mortgage Loans [Member]
Economic assumptions used to determine the fair value of capitalized servicing rights and the sensitivity of value to changes in the assumptions
Weighted-average prepayment speeds	7.98%
Impact on fair value of 10% adverse change, prepayment speeds	$ (2,358,000)
Impact on fair value of 20% adverse change, prepayment speeds	$ (4,521,000)
Weighted-average OAS	17.78%
Impact on fair value of 10% adverse change, OAS	$ (1,913,000)
Impact on fair value of 20% adverse change, OAS	(3,742,000)
Commercial Loans [Member]
Economic assumptions used to determine the fair value of capitalized servicing rights and the sensitivity of value to changes in the assumptions
Impact on fair value of 20% adverse change, discount rate	(4,324,000)
Impact on fair value of 10% adverse change, discount rate	$ (2,245,000)
Weighted-average discount rate	18.00%

Capitalized servicing assets (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Residential Mortgage Loan [Member]
Capitalized servicing assets (Textuals) [Abstract]
Mortgage loans serviced for others	$ 15,900,000,000	$ 15,900,000,000	$ 15,400,000,000
Valuation allowance for capitalized residential mortgage loan servicing assets reversed	50,000	21,950,000
Provision for impairment of valuation allowance for capitalized residential mortgage loan servicing assets			16,000,000
Estimated fair value of capitalized mortgage loan servicing assets	$ 162,000,000	$ 158,000,000
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets	13.20%	13.30%
Weighted-average option-adjusted spread in the discount rate	748 basis points	775 basis points
Small Balance Commercial Mortgage Loans [Member]
Capitalized servicing assets (Textuals) [Abstract]
Mortgage loans serviced for others	$ 5,200,000,000	$ 5,500,000,000	5,900,000,000
Estimated fair value of capitalized mortgage loan servicing assets	$ 58,000,000	$ 64,000,000
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets	19.70%	20.30%
Weighted-average option-adjusted spread in the discount rate	1778 basis points	1,779 basis points
Commercial Loans [Member]
Capitalized servicing assets (Textuals) [Abstract]
Mortgage loans serviced for others	$ 8,100,000,000	$ 7,100,000,000	$ 6,400,000,000
Estimated fair value of capitalized mortgage loan servicing assets	$ 50,000,000	$ 39,000,000
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets	18.00%	18.00%

Goodwill and other intangible assets (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Total amortizing intangible assets
Gross Carrying Amount	$ 820,968	$ 819,366
Accumulated Amortization	695,051	636,948
Net Carrying Amount	125,917	182,418
Core Deposits [Member]
Total amortizing intangible assets
Gross Carrying Amount	701,000	701,000
Accumulated Amortization	576,986	524,358
Net Carrying Amount	124,014	176,642
Other Finite Lived Intangible Assets [Member]
Total amortizing intangible assets
Gross Carrying Amount	119,968	118,366
Accumulated Amortization	118,065	112,590
Net Carrying Amount	$ 1,903	$ 5,776

Goodwill and other intangible assets (Details1) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)
Estimated amortization expense in future years for such intangible assets
2011	$ 42,139
2012	32,668
2013	24,072
2014	16,109
2015	8,346
Later years	2,583
Finite-Lived Intangible Assets, Future Amortization Expense	$ 125,917

Goodwill and other intangible assets (Details2) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Goodwill
Goodwill	$ 3,524,625	$ 3,524,625
Business Banking [Member]
Goodwill
Goodwill	748,907	748,907
Commercial Banking [Member]
Goodwill
Goodwill	907,524	907,524
Commercial Real Estate [Member]
Goodwill
Goodwill	349,197	349,197
Retail Banking [Member]
Goodwill
Goodwill	1,144,404	1,144,404
All Other [Member]
Goodwill
Goodwill	$ 374,593	$ 374,593

Goodwill and other intangible assets (Details Textuals) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)
Goodwill and other intangible assets (Textuals) [Abstract]
Minimum estimated useful lives of core deposit and other intangible assets (in years)	5
Maximum amortization periods of core deposit and other intangible assets	10
Weighted-average original amortization period of core deposit and other intangible assets	8
Finite Lived Intangible Assets Remaining Weighted Average Useful Life	5
Amortization of core deposit and other intangible assets	$ 58,103	$ 64,255	$ 66,646
Goodwill Impairment Loss	$ 0

Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Amounts and interest rates of short-term borrowings
Short term borrowings, total	$ 947,432	$ 2,442,582	$ 3,009,735
Amount outstanding	$ 80,877	$ 230,890
Weighted-average interest rate	0.19%	0.10%	0.27%
Daily-average amount outstanding	$ 1,854,033	$ 2,911,065	$ 6,086,122
Weighted average interest rate	0.16%	0.24%	2.34%
Federal Funds Purchased and Repurchase Agreements [Member]
Amounts and interest rates of short-term borrowings
Amount outstanding	$ 866,555	$ 2,211,692	$ 970,529
Weighted-average interest rate	0.19%	0.04%	0.10%
Highest amount at a month-end	$ 2,612,727	$ 2,491,573	$ 5,291,846
Daily-average amount outstanding	$ 1,749,525	$ 1,885,464	$ 4,652,388
Weighted average interest rate	0.15%	0.15%	2.15%
Other Short Term Borrowings [Member]
Amounts and interest rates of short-term borrowings
Amount outstanding	$ 80,877	$ 230,890	$ 2,039,206
Weighted-average interest rate	0.20%	0.66%	0.36%
Highest amount at a month-end	$ 236,842	$ 2,049,727	$ 2,039,206
Daily-average amount outstanding	$ 104,508	$ 1,025,601	$ 1,433,734
Weighted average interest rate	0.33%	0.42%	2.97%

Borrowings (Details 1) $ in Thousands	Dec. 31, 2010 USD ($)
M&T (Consolidated) [Member]
Lines of credit under formal agreements
Outstanding borrowings	$ 0
Unused	30,000
M&T Bank [Member]
Lines of credit under formal agreements
Outstanding borrowings	2,897,133
Unused	12,914,549
M&T Bank, N.A [Member]
Lines of credit under formal agreements
Outstanding borrowings	0
Unused	$ 98,158

Borrowings (Details 2) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Advances from FHLB:
Variable rates	$ 2,525,268	$ 4,405,925
Fixed rates	347,161	818,562
Agreements to repurchase securities	1,625,001	1,625,001
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Other Long-term Debt	48,384	7,388
Long-term borrowings	7,840,151	10,240,016
8% due 2010 due 2010 [Member] \| M&T (Consolidated) [Member]
Subordinated notes of M&T Bank:
Subordinated Debt	0	140,854
3.85% due 2013, variable rate commenced in 2008 [Member] \| M&T (Consolidated) [Member]
Subordinated notes of M&T Bank:
Subordinated Debt	400,000	400,000
6.625% due 2017 [Member] \| M&T (Consolidated) [Member]
Subordinated notes of M&T Bank:
Subordinated Debt	425,969	404,428
9.5% due 2018 [Member] \| M&T (Consolidated) [Member]
Subordinated notes of M&T Bank:
Subordinated Debt	50,000	50,000
5.585% due 2020, variable rate commencing 2015 [Member] \| M&T (Consolidated) [Member]
Subordinated notes of M&T Bank:
Subordinated Debt	372,668	366,883
5.629% due 2021, variable rate commencing 2016 [Member] \| M&T (Consolidated) [Member]
Subordinated notes of M&T Bank:
Subordinated Debt	568,196	545,194
Senior notes of M&T - 5.375% due 2012 [Member] \| M&T (Consolidated) [Member]
Long-term borrowings
Senior Notes	299,971	299,950
M&T Capital Trust I - 8.234%, due 2027 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	154,640	154,640
M&T Capital Trust II - 8.277%, due 2027 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	103,093	103,093
M&T Capital Trust III - 9.25%, due 2027 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	67,084	67,409
BSB Capital Trust I - 8.125%, due 2028 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	15,519	15,496
Provident Trust I - 8.29%, due 2028 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	24,256	24,061
Southern Financial Statutory Trust I - 10.60%, due 2030 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	6,455	6,439
M&T Capital Trust IV - 8.50%, due 2068 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	350,010	350,010
First Maryland Capital One Variable Rates Due 2027 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	143,025	142,487
First Maryland Capital II - due 2027 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	143,975	143,312
Allfirst Asset Trust - due 2029 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	95,623	95,477
BSB Capital Trust III - due 2033 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	15,464	15,464
Provident Trust III - due 2033 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	50,823	50,430
Southern Financial Capital Trust III - due 2033 [Member]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Junior subordinated debentures associated with preferred capital securities	$ 7,566	$ 7,513

Borrowings (Details 3) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Long-term Debt, by Maturity [Abstract]
Maturity at 2011	$ 1,886,860
Maturity at 2012	1,560,616
Maturity at 2013	392,870
Maturity at 2014	7,570
Maturity at 2015	0
Maturity at later years	3,992,235
Long-term borrowings	$ 7,840,151	$ 10,240,016

Borrowings (Details Textuals) $ in Thousands	12 Months Ended
Borrowings (Details Textuals) $ in Thousands	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 02, 2011 USD ($)	Dec. 31, 2008
Borrowings (Textuals) [Abstract]
Maturity period of other short-term borrowings	one year or less
Rate of interest of subordinated notes				3.85%
Advances from the FHLB maturity date	2035
Minimum contractual interest rates of long-term agreements to repurchase securities	3.69%
Maximum contractual interest rates of long-term agreements to repurchase securities	5.14%
Weighted Average Contractual Interest Rates of long term agreements to repurcahse securities	4.16%	4.21%		4.21%
Repurchase dates of the long-term agreements outstanding		2017
Minimum variable interest rate of Junior Subordinated Debentures	0.0114	0.0113
Maximum variable interest rate of Junior Subordinated Debentures	0.0364	0.0363
Weighted-average variable rates payable on Junior Subordinated Debentures	1.72%	1.70%
Rate on related enhanced trust preferred securities	8.50%
Junior Subordinated Debentures Maturity Date	Jan. 31, 2068
Debt Maturity, Start Date	2027
Debt Maturity, End Date	2068
Period of days prior to redemption or repurchase of enhanced trust preferred securities applicable to provisions of the replacement capital covenant	180
End date of restrictions included in the replacement capital covenant	Jan. 31, 2048
M&T (Consolidated) [Member]
Borrowings (Textuals) [Abstract]
Maximum amount of borrowal using revolving credit agreement			$ 30,000
M&T Bank [Member]
Borrowings (Textuals) [Abstract]
Borrowing facilities available with the FHLB's amount	$ 6,000,000
FHLB of Atlanta [Member]
Borrowings (Textuals) [Abstract]
Federal funds and short-term repurchase agreements outstanding	28,000	$ 152,000
FHLB New York [Member]
Borrowings (Textuals) [Abstract]
Federal funds and short-term repurchase agreements outstanding	0
Federal Reserve Bank Of New York [Member]
Borrowings (Textuals) [Abstract]
Federal funds and short-term repurchase agreements outstanding	0
Line of Credit Facility	9,900,000
Junior Subordinated Debenture due January 31, 2068 [Member]
Borrowings (Textuals) [Abstract]
Junior subordinated debentures	$ 350,000
8% due 2010 due 2010 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	8.00%
3.85% due 2013, variable rate commenced in 2008 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	3.85%
Subordinated borrowing variable rate description	Rate is equal to three-month London Interbank Offered Rate plus 1.50%
6.625% due 2017 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	6.625%
9.5% due 2018 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	9.50%
5.585% due 2020, variable rate commencing 2015 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	5.585%
5.629% due 2021, variable rate commencing 2016 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	5.629%
Senior notes of M&T - 5.375% due 2012 [Member]
Borrowings (Textuals) [Abstract]
Rate of interest of subordinated notes	5.375%
M&T Capital Trust I - 8.234%, due 2027 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	8.234%
Junior subordinated debentures	$ 154,640	154,640
M&T Capital Trust II - 8.277%, due 2027 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	8.277%
Junior subordinated debentures	$ 103,093	103,093
M&T Capital Trust III - 9.25%, due 2027 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	9.25%
Junior subordinated debentures	$ 67,084	67,409
BSB Capital Trust I - 8.125%, due 2028 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	8.125%
Junior subordinated debentures	$ 15,519	15,496
Provident Trust I - 8.29%, due 2028 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	8.29%
Junior subordinated debentures	$ 24,256	24,061
Southern Financial Statutory Trust I - 10.60%, due 2030 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	10.60%
Junior subordinated debentures	$ 6,455	6,439
M&T Capital Trust IV - 8.50%, due 2068 [Member]
Borrowings (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Rate	8.50%
Junior subordinated debentures	$ 350,010	$ 350,010
Long-term variable rate advances from the FHLB [Member]
Borrowings (Textuals) [Abstract]
Variable contractual interest rate of long term debt lower limit	0.24%	0.00%
Variable contractual interest rate of long term debt Upper limit	2.00%	3.53%
Weighted average contractual variable interest rate	0.32%	0.35%
Long-term fixed rate advances from the FHLB [Member]
Borrowings (Textuals) [Abstract]
Variable contractual interest rate of long term debt lower limit	3.48%
Variable contractual interest rate of long term debt Upper limit	7.32%
Weighted average contractual variable interest rate	4.33%	4.89%		5.13%

Shareholders Equity (Details)

12 Months Ended

Dec. 31, 2010

USD ($)

$ / shares

Apr. 01, 2011

Dec. 31, 2009

USD ($)

$ / shares

Issued and outstanding preferred stock

Carrying value | $

$ 740,657,000

$ 730,235,000

Shareholders Equity (Textuals) [Abstract]

Preferred stock, shares authorized | shares

1,000,000

Preferred stock, par value | $

$ 1.00

Liquidation preference | $ / shares

$ 1,000

Limitation by U.S. Treasury on maximum amount of dividend to be paid per common stock quarterly

0.70 per share

Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member]

Issued and outstanding preferred stock

Shares issued and outstanding | shares

^[1]

600,000

Carrying value | $

^[1]

$ 578,630,000

$ 572,580,000

Shareholders Equity (Textuals) [Abstract]

Preferred stock, shares authorized | shares

600,000

Liquidation preference | $

$ 1,000

Series B Mandatory Convertible Non-cumulative Preferred Stock [Member]

Issued and outstanding preferred stock

Shares issued and outstanding | shares

^[2]

26,500

Carrying value | $

^[2]

$ 26,500,000

26,500,000

Shareholders Equity (Textuals) [Abstract]

Preferred stock, shares authorized | shares

26,500

Liquidation preference | $

$ 1,000

Series C Fixed Rate Cumulative Perpetual Preferred Stock [Member]

Issued and outstanding preferred stock

Shares issued and outstanding | shares

^[1],[3]

151,500

Carrying value | $

^[1],[3]

$ 135,527,000

$ 131,155,000

Shareholders Equity (Textuals) [Abstract]

Preferred stock, shares authorized | shares

151,500

Liquidation preference | $

$ 1,000

Ten Year Warrant Series A Preferred [Member]

Shareholders Equity (Textuals) [Abstract]

Ten-year warrant to purchase common stock | shares

1,218,522

Ten Year Warrant Series C Preferred [Member]

Shareholders Equity (Textuals) [Abstract]

Ten-year warrant to purchase common stock | shares

407,542

Series A [Member]

Shareholders Equity (Textuals) [Abstract]

Exercise price of each class of warrants or rights outstanding | $

73.86

Series B [Member]

Shareholders Equity (Textuals) [Abstract]

Preferred Stock Dividend Rate

10% per year

Number of common shares series B preferred stock will convert into | shares

433,148

Series C [Member]

Shareholders Equity (Textuals) [Abstract]

Exercise price of each class of warrants or rights outstanding | $

55.76

Preferred series A and C first five years [Member]

Shareholders Equity (Textuals) [Abstract]

Preferred Stock Dividend Rate

5% per year

Preferred series A and C after five years [Member]

Shareholders Equity (Textuals) [Abstract]

Preferred Stock Dividend Rate

9% per year

[1]	Shares were issued as part of the Troubled Asset Relief Program - Capital Purchase Program of the U.S. Department of Treasury ("U.S. Treasury"). Cash proceeds were allocated between the preferred stock and a ten-year warrant to purchase M and T common stock (Series A - 1,218,522 common shares at $73.86 per share, Series C - 407,542 common shares at $55.76 per share). Dividends, if declared, will accrue and be paid quarterly at a rate of 5% per year for the first five years following the original 2008 issuance dates and thereafter at a rate of 9% per year. The agreement with the U.S. Treasury contains limitations on certain actions of M and T, including the payment of quarterly cash dividends on M and T's common stock in excess of $.70 per share, the repurchase of its common stock during the first three years of the agreement, and the amount and nature of compensation arrange ments for certain of the Company's officers.
[2]	Shares were assumed in the Provident acquisition and a new Series B Preferred Stock was designated. In the aggregate, the shares of Series B Preferred Stock will automatically convert into 433,148 shares of M and T common stock on April 1, 2011, but shareholders may elect to convert their preferred shares at any time prior to that date. Dividends, if declared, are payable quarterly in arrears at a rate of 10% per year.
[3]	Shares were assumed in the Provident acquisition and a new Series C Preferred Stock was designated.

Stock-based compensation plans (Details)	12 Months Ended
Stock-based compensation plans (Details)	Dec. 31, 2010 USD ($) shares
Restricted Stock Units [Member]
Summary of restricted stock and restricted stock unit activity
Restricted Stock Outstanding, Unvested at January 1, 2010 \| shares	566,449
Weighted-Average Grant Price, Unvested at January 1, 2010 \| $	$ 39.21
Restricted Stock Outstanding, Granted \| shares	231,037
Weighted-Average Grant Price, Granted \| $	$ 73.75
Restricted Stock Outstanding, Vested \| shares	(74,144)
Weighted-Average Grant Price, Vested \| $	$ 41.58
Restricted Stock Outstanding, Cancelled \| shares	(3,366)
Weighted-Average Grant Price, Cancelled \| $	$ 52.07
Restricted Stock Outstanding, Unvested at December 31, 2010 \| shares	719,976
Weighted-Average Grant Price, Unvested at December 31, 2010 \| $	$ 49.99
Restricted Stock [Member]
Summary of restricted stock and restricted stock unit activity
Restricted Stock Outstanding, Unvested at January 1, 2010 \| shares	733,687
Weighted-Average Grant Price, Unvested at January 1, 2010 \| $	$ 42.52
Restricted Stock Outstanding, Granted \| shares	423,002
Weighted-Average Grant Price, Granted \| $	$ 75.37
Restricted Stock Outstanding, Vested \| shares	(165,799)
Weighted-Average Grant Price, Vested \| $	$ 65.33
Restricted Stock Outstanding, Cancelled \| shares	(25,818)
Weighted-Average Grant Price, Cancelled \| $	$ 49.74
Restricted Stock Outstanding, Unvested at December 31, 2010 \| shares	965,072
Weighted-Average Grant Price, Unvested at December 31, 2010 \| $	$ 52.81

Stock-based compensation plans (Details 1)	12 Months Ended
Stock-based compensation plans (Details 1)	Dec. 31, 2010 USD ($) shares
Summary of stock option activity
Stock Options Outstanding at January 1, 2010 \| shares	12,180,017
Weighted-Average Exercise Price, Outstanding at January 1, 2010	$ 94.45
Stock Options Outstanding, Granted \| shares	3,386
Weighted-Average Exercise Price, Granted	$ 73.75
Stock Options Outstanding, Exercised \| shares	(1,148,798)
Weighted-Average Exercise Price, Exercised	$ 65.32
Stock Options Outstanding, Cancelled \| shares	(50,368)
Weighted-Average Exercise Price, Cancelled	$ 98.40
Stock Options Outstanding, Expired \| shares	(405,822)
Weighted-Average Exercise Price, Expired	$ 100.65
Stock Options Outstanding at December 31, 2010 \| shares	10,578,415
Weighted-Average Exercise Price, Outstanding at December 31, 2010	$ 97.35
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm	4.6
Aggregate Intrinsic Value, Outstanding at December 31, 2010	$ 25,690,000
Stock Options Outstanding, Exercisable at December 31, 2010 \| shares	8,106,077
Weighted-Average Exercise Price, Exercisable at December 31, 2010	$ 97.49
Weighted-Average Life (In Years), Exercisable at December 31, 2010	3.9
Aggregate Intrinsic Value, Exercisable at December 31, 2010	$ 22,882,000

Stock-based compensation plans (Details Textuals)	12 Months Ended
Stock-based compensation plans (Details Textuals)	Dec. 31, 2010 USD ($) shares	Dec. 31, 2009 USD ($) shares	Dec. 31, 2008 USD ($) shares
Stock-based compensation plans (Textuals) [Abstract]
Stock-based compensation expense	$ 54,000,000	$ 54,000,000	$ 50,000,000
Recognized income tax benefits related to stock-based compensation	$ 17,000,000	$ 17,000,000	11,000,000
Shares under equity incentive compensation plan for future grant \| shares	5,959,828	6,134,264
Weighted-average estimated grant date value per option			15.85
Tax benefits realized from exercise of stock options	$ 7,000,000	$ 3,000,000	4,000,000
Intrinsic value of stock options exercised	21,000,000	6,000,000	13,000,000
Total grant date fair value of stock options vested	$ 38,000,000	37,000,000	36,000,000
Common stock issued under stock purchase plan, period intervals	one year or six months
Cash realized from exercise of stock options	$ 55,000,000	15,000,000	25,000,000
Loans receivable secured by Company common stock through acquisition		$ 4,000,000
Stock Option Awards [Member]
Stock-based compensation plans (Textuals) [Abstract]
Stock options exercisable period, maximum	ten years and one day
Option term	6.5
Reduced percentage of estimated value of stock options for purposes of recognizing stock-based compensation expense	7.00%
Aggregate fair value of options expected to vest that were granted in period			$ 46,000,000
Unrecognized compensation cost related to non-vested awards	$ 23,000,000
Unrecognized compensation cost expected to be recognized over a weighted average period (in years)	1.5
Vesting period	4
Shares issued \| shares	423,002	709,415	37,747
Weighted-average grant date fair value	$ 31,880,000	$ 27,932,000	$ 3,446,000
weighted-average assumptions: risk-free interest rate			3.21%
weighted-average assumptions: expected volatility			21.00%
weighted-average assumptions: estimated dividend yield			3.07%
Non Vested Stock Options
Stock-based compensation plans (Textuals) [Abstract]
Unrecognized compensation cost related to non-vested awards	$ 4,000,000
Unrecognized compensation cost expected to be recognized over a weighted average period (in years)	1
Restricted Stock Units [Member]
Stock-based compensation plans (Textuals) [Abstract]
Unrecognized compensation cost related to non-vested awards	$ 7,000,000
Unrecognized compensation cost expected to be recognized over a weighted average period (in years)	1.2
Shares issued \| shares	231,037	578,131	0
Weighted-average grant date fair value	$ 17,039,000	$ 22,663,000
Employee Stock Purchase Plan [Member]
Stock-based compensation plans (Textuals) [Abstract]
Shares issued \| shares	170,405	3,149	2,377
Common stock authorized for issuance \| shares	1,000,000
Common stock issued through employee stock purchase plan \| shares	568,886
Cash received from the exercise of stock options	$ 8,998,000	$ 100,000	$ 173,000
Estimated weighted-average grant date value per right	$ 14.33	$ 16.39	$ 12.79
Period between grant date and exercise date	six months to one year
weighted-average assumptions: risk-free interest rate	0.29%	0.45%	2.05%
weighted-average assumptions: expected volatility	34.00%	69.00%	34.00%
weighted-average assumptions: estimated dividend yield	3.20%	4.77%	3.84%
Employee [Member]
Stock-based compensation plans (Textuals) [Abstract]
Shares issuable under deferred compensation plans \| shares	51,439	54,386
Share issued in connection with deferred compensation plans \| shares	117,117
Director [Member]
Stock-based compensation plans (Textuals) [Abstract]
Shares issuable under deferred compensation plans \| shares	19,906	20,784
Share issued in connection with deferred compensation plans \| shares	148,534

Pension plans and other postretirement benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Net periodic defined benefit cost for defined benefit plans
Expected return on plan assets	$ (51,000)
Defined benefit plans [Member]
Net periodic defined benefit cost for defined benefit plans
Service cost	19,670	$ 19,483	$ 19,409
Interest cost on benefit obligation	47,905	46,107	42,544
Expected return on plan assets	(50,844)	(46,976)	(46,092)
Amortization of prior service cost	(6,559)	(6,559)	(6,559)
Recognized net actuarial loss	13,551	8,292	3,942
Net periodic pension expense	23,723	20,347	13,244
Other postretirement benefits [Member]
Net periodic defined benefit cost for defined benefit plans
Service cost	383	353	559
Interest cost on benefit obligation	3,130	3,302	4,033
Amortization of prior service cost	176	243	275
Recognized net actuarial loss	(9)	(19)	42
Net other postretirement benefits expense	$ 3,680	$ 3,879	$ 4,909

Pension plans and other postretirement benefits (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Defined benefit plans [Member]
Change in benefit obligation:
Defined Benefit Plan, Benefit Obligation, Beginning Balance	$ 857,122	$ 750,913
Service cost	19,670	19,483	$ 19,409
Interest cost	47,905	46,107	42,544
Plan participants' contributions	0	0
Actuarial (gain) loss	64,061	26,694
Settlements/curtailments	(3,231)	(7,232)
Business combinations		58,239
Medicare Part D reimbursement	0	0
Benefits paid	(37,534)	(37,082)
Benefit obligation at end of year	947,993	857,122	750,913
Funded status	(109,528)	(90,242)
Assets and liabilities recognized in the consolidated balance sheet were:
Net prepaid asset	6,629	6,266
Accrued liabilities	(116,157)	(96,508)
Amounts recognized in accumulated other comprehensive income ("AOCI") were:
Net loss (gain)	232,725	239,219
Net prior service cost	(36,572)	(43,131)
Pre-tax adjustment to AOCI	196,153	196,088
Taxes	(76,990)	(76,950)
Net adjustment to AOCI	119,163	119,138
Other postretirement benefits [Member]
Change in benefit obligation:
Defined Benefit Plan, Benefit Obligation, Beginning Balance	56,575	62,950
Service cost	383	353	559
Interest cost	3,130	3,302	4,033
Plan participants' contributions	2,776	3,138
Actuarial (gain) loss	6,433	(5,209)
Settlements/curtailments	0	0
Business combinations		343
Medicare Part D reimbursement	789	870
Benefits paid	(8,411)	(9,172)
Benefit obligation at end of year	61,675	56,575	$ 62,950
Funded status	(61,675)	(56,575)
Assets and liabilities recognized in the consolidated balance sheet were:
Net prepaid asset	0	0
Accrued liabilities	(61,675)	(56,575)
Amounts recognized in accumulated other comprehensive income ("AOCI") were:
Net loss (gain)	2,577	(3,663)
Net prior service cost	269	243
Pre-tax adjustment to AOCI	2,846	(3,420)
Taxes	(1,117)	1,328
Net adjustment to AOCI	$ 1,729	$ (2,092)

Pension plans and other postretirement benefits (Details 2) - USD ($)

12 Months Ended

Dec. 31, 2010

Dec. 31, 2009

Change in plan assets:

Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance

^[1]

$ 763,242,000

Actual return on plan assets

108,000,000

Fair value of plan assets at end of year

^[1]

834,904,000

$ 763,242,000

Defined benefit plans [Member]

Change in plan assets:

Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance

766,880,000

550,671,000

Actual return on plan assets

107,846,000

158,945,000

Employer contributions

4,504,000

48,528,000

Business combinations

51,657,000

Plan participants' contributions

Medicare Part D reimbursement

Settlements

(3,231,000)

(5,839,000)

Benefits paid

(37,534,000)

(37,082,000)

Fair value of plan assets at end of year

838,465,000

766,880,000

Investment Securities (Details 1) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, amortized cost	$ 2,683,670
Total securities with disclosed rating, fair value	2,331,133
Amortized Cost	7,231,425	$ 8,073,240
Estimated fair value	7,051,454	$ 7,629,485
A or Better [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	958,032
BBB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	303,200
BB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	165,943
B Or Less [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	848,444
Not Rated [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	55,514
Obligations of states and political subdivisions [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, amortized cost	251,040
Total securities with disclosed rating, fair value	252,794
Obligations of states and political subdivisions [Member] \| A or Better [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	172,088
Obligations of states and political subdivisions [Member] \| BBB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	39,222
Obligations of states and political subdivisions [Member] \| BB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	200
Obligations of states and political subdivisions [Member] \| B Or Less [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Obligations of states and political subdivisions [Member] \| Not Rated [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	41,284
Privately issued residential [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, amortized cost	1,989,601
Total securities with disclosed rating, fair value	1,633,701
Privately issued residential [Member] \| A or Better [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	736,043
Privately issued residential [Member] \| BBB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	138,522
Privately issued residential [Member] \| BB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	37,699
Privately issued residential [Member] \| B Or Less [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	721,437
Privately issued residential [Member] \| Not Rated [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Privately issued commercial [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, amortized cost	25,357
Total securities with disclosed rating, fair value	22,407
Privately issued commercial [Member] \| A or Better [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	22,407
Privately issued commercial [Member] \| BBB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Privately issued commercial [Member] \| BB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Privately issued commercial [Member] \| B Or Less [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Privately issued commercial [Member] \| Not Rated [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Collateralized Debt Obligations [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, amortized cost	95,080
Total securities with disclosed rating, fair value	110,756
Collateralized Debt Obligations [Member] \| A or Better [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	6,474
Collateralized Debt Obligations [Member] \| BBB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	12,268
Collateralized Debt Obligations [Member] \| BB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	14,917
Collateralized Debt Obligations [Member] \| B Or Less [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	77,097
Collateralized Debt Obligations [Member] \| Not Rated [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	0
Other Debt Securities [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, amortized cost	322,592
Total securities with disclosed rating, fair value	311,475
Other Debt Securities [Member] \| A or Better [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	21,020
Other Debt Securities [Member] \| BBB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	113,188
Other Debt Securities [Member] \| BB [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	113,127
Other Debt Securities [Member] \| B Or Less [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	49,910
Other Debt Securities [Member] \| Not Rated [Member]
Schedule of Ratings of Investment Securities
Total securities with disclosed rating, fair value	$ 14,230

Allowance for credit losses (Details 4) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	$ 51,990,382	$ 51,936,686
Commercial, Financial, Leasing [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	13,390,610
Commerical real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	21,183,161
Residential real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	5,928,056
Consumer loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	11,488,555
Individually evaluated for impairment [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	1,227,553
Individually evaluated for impairment [Member] \| Commercial, Financial, Leasing [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	186,739
Individually evaluated for impairment [Member] \| Commerical real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	682,120
Individually evaluated for impairment [Member] \| Residential real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	286,612
Individually evaluated for impairment [Member] \| Consumer loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	72,082
Collectively evaluated for impairment [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	50,665,810
Collectively evaluated for impairment [Member] \| Commercial, Financial, Leasing [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	13,201,621
Collectively evaluated for impairment [Member] \| Commerical real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	20,417,958
Collectively evaluated for impairment [Member] \| Residential real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	5,632,124
Collectively evaluated for impairment [Member] \| Consumer loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	11,414,107
Purchased Impaired [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	97,019
Purchased Impaired [Member] \| Commercial, Financial, Leasing [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	2,250
Purchased Impaired [Member] \| Commerical real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	83,083
Purchased Impaired [Member] \| Residential real estate loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	9,320
Purchased Impaired [Member] \| Consumer loans [Member]
Recorded investment in loans and leases on the basis of the Company's impairment methodology
Loans and Leases Receivable Net of Deferred Income	$ 2,366

Loans and leases (Details 1) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	$ 51,990,382	$ 51,936,686
Commercial, Financial, Leasing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	13,390,610
Commercial Real Estate Excluding Resendential Builder and Developer and Other Construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	16,931,790
Residential builder and developer [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	1,351,490
Other commercial construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,899,881
Residential real estate excluding Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	5,303,677
Residential Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	624,379
Home equity lines and loans [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	6,556,351
Automobile [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,684,726
Other [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,247,478
Purchased Impaired [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	97,019
Purchased Impaired [Member] \| Commercial, Financial, Leasing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,250
Purchased Impaired [Member] \| Commercial Real Estate Excluding Resendential Builder and Developer and Other Construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	8,275
Purchased Impaired [Member] \| Residential builder and developer [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	72,710
Purchased Impaired [Member] \| Other commercial construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,098
Purchased Impaired [Member] \| Residential real estate excluding Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	9,320
Purchased Impaired [Member] \| Residential Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	0
Purchased Impaired [Member] \| Home equity lines and loans [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,366
Purchased Impaired [Member] \| Automobile [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	0
Purchased Impaired [Member] \| Other [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	0
Current [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	49,739,383
Current [Member] \| Commercial, Financial, Leasing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	13,088,887
Current [Member] \| Commercial Real Estate Excluding Resendential Builder and Developer and Other Construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	16,589,240
Current [Member] \| Residential builder and developer [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	891,764
Current [Member] \| Other commercial construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,723,399
Current [Member] \| Residential real estate excluding Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	4,699,711
Current [Member] \| Residential Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	475,236
Current [Member] \| Home equity lines and loans [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	6,472,563
Current [Member] \| Automobile [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,608,230
Current [Member] \| Other [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	2,190,353
30-89 Days Past Due [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	645,193
30-89 Days Past Due [Member] \| Commercial, Financial, Leasing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	96,087
30-89 Days Past Due [Member] \| Commercial Real Estate Excluding Resendential Builder and Developer and Other Construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	89,906
30-89 Days Past Due [Member] \| Residential builder and developer [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	30,805
30-89 Days Past Due [Member] \| Other commercial construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	36,420
30-89 Days Past Due [Member] \| Residential real estate excluding Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	229,641
30-89 Days Past Due [Member] \| Residential Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	42,674
30-89 Days Past Due [Member] \| Home equity lines and loans [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	38,367
30-89 Days Past Due [Member] \| Automobile [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	44,604
30-89 Days Past Due [Member] \| Other [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	36,689
90 Days or More Past Due and Accruing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	269,593
90 Days or More Past Due and Accruing [Member] \| Commercial, Financial, Leasing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	16,647
90 Days or More Past Due and Accruing [Member] \| Commercial Real Estate Excluding Resendential Builder and Developer and Other Construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	35,338
90 Days or More Past Due and Accruing [Member] \| Residential builder and developer [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	9,763
90 Days or More Past Due and Accruing [Member] \| Other commercial construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	11,323
90 Days or More Past Due and Accruing [Member] \| Residential real estate excluding Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	192,276
90 Days or More Past Due and Accruing [Member] \| Residential Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	0
90 Days or More Past Due and Accruing [Member] \| Home equity lines and loans [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	0
90 Days or More Past Due and Accruing [Member] \| Automobile [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	0
90 Days or More Past Due and Accruing [Member] \| Other [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	4,246
Nonaccrual [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	1,239,194
Nonaccrual [Member] \| Commercial, Financial, Leasing [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	186,739
Nonaccrual [Member] \| Commercial Real Estate Excluding Resendential Builder and Developer and Other Construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	209,031
Nonaccrual [Member] \| Residential builder and developer [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	346,448
Nonaccrual [Member] \| Other commercial construction [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	126,641
Nonaccrual [Member] \| Residential real estate excluding Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	172,729
Nonaccrual [Member] \| Residential Alt-A [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	106,469
Nonaccrual [Member] \| Home equity lines and loans [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	43,055
Nonaccrual [Member] \| Automobile [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	31,892
Nonaccrual [Member] \| Other [Member]
Summary of current, past due and nonaccrual loans
Total loans and leases, net of unearned discount	$ 16,190

Allowance for credit losses (Details 3) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	$ 902,941	$ 878,022	$ 787,904	$ 759,439
Unallocated [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	70,382	70,376
Individually evaluated for impairment [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	209,033
Individually evaluated for impairment [Member] \| Commercial, Financial, Leasing [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	40,459
Individually evaluated for impairment [Member] \| Commerical real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	114,082
Individually evaluated for impairment [Member] \| Residential real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	39,000
Individually evaluated for impairment [Member] \| Consumer loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	15,492
Collectively evaluated for impairment [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	618,626
Collectively evaluated for impairment [Member] \| Commercial, Financial, Leasing [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	171,670
Collectively evaluated for impairment [Member] \| Commerical real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	282,505
Collectively evaluated for impairment [Member] \| Residential real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	46,976
Collectively evaluated for impairment [Member] \| Consumer loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	117,475
Purchased Impaired [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	4,900
Purchased Impaired [Member] \| Commercial, Financial, Leasing [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	450
Purchased Impaired [Member] \| Commerical real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	3,975
Purchased Impaired [Member] \| Residential real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	375
Purchased Impaired [Member] \| Consumer loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	100
Allocated [Member] \| Commercial, Financial, Leasing [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	212,579	219,170
Allocated [Member] \| Commerical real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	400,562	359,770
Allocated [Member] \| Residential real estate loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	86,351	91,582
Allocated [Member] \| Consumer loans [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	133,067	$ 137,124
Allocated [Member] \| Total Allocated [Member]
Allowance for credit losses on the basis of the Company's impairment methodology
Allowance for credit losses	$ 832,559

Pension Plans and other Postretirement Benefits (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)
Defined benefit plans [Member]
Amortization of amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit expense
Amortization of net prior service cost (credit)	$ (6,559)
Amortization of net loss	20,379
Other postretirement benefits [Member]
Amortization of amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit expense
Amortization of net prior service cost (credit)	108
Amortization of net loss	$ 18

Pension Plans and other Postretirement Benefits (Details 4)	Dec. 31, 2010	Dec. 31, 2009
Defined benefit plans [Member]
Assumed weighted-average rates used to determine benefit obligations
Discount rate	5.25%	5.75%
Rate of increase in future compensation levels	4.50%	4.50%
Other postretirement benefits [Member]
Assumed weighted-average rates used to determine benefit obligations
Discount rate	5.25%	5.75%
Rate of increase in future compensation levels	0.00%	0.00%

Pension Plans and other Postretirement Benefits (Details 5)	1 Months Ended	12 Months Ended
	May 31, 2009	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Assumed weighted-average rates used to determine net benefit expense
Discount rate	7.00%	5.25%	5.75%
Long-term rate of return on plan assets	4.50%
Defined benefit plans [Member]
Assumed weighted-average rates used to determine net benefit expense
Discount rate		5.75%	6.00%	6.00%
Long-term rate of return on plan assets		6.50%	6.50%	7.50%
Rate of increase in future compensation levels		4.50%	4.60%	4.60%
Other postretirement benefits [Member]
Assumed weighted-average rates used to determine net benefit expense
Discount rate		5.75%	6.00%	6.00%
Long-term rate of return on plan assets		0.00%
Rate of increase in future compensation levels		0.00%

Pension Plans and other Postretirement Benefits (Details 8) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)
Effects on one-percentage point change in assumed health care cost trend rates
Increase in Service and interest cost	$ 143
Decrease in Service and interest cost	(128)
Increase in Accumulated postretirement benefit obligation	3,218
Decrease in Accumulated postretirement benefit obligation	$ (2,876)

Pension Plans and Other Postretirement Benefits (Details 9) $ in Thousands	Dec. 31, 2010 USD ($)
Defined Benefit Pension Member [Member]
Estimated benefits expected to be paid in future years related to defined benefit pension and other postretirement benefits plans
2011	$ 43,599
2012	46,144
2013	48,794
2014	52,435
2015	54,847
2016 through 2020	326,134
Other postretirement benefits [Member]
Estimated benefits expected to be paid in future years related to defined benefit pension and other postretirement benefits plans
2011	6,399
2012	6,294
2013	6,236
2014	6,177
2015	6,081
2016 through 2020	$ 28,318

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Current
Federal	$ 250,489	$ 52,792	$ 231,426
State and city	55,071	4,107	(30,514)
Total current	305,560	56,899	200,912
Deferred
Federal	47,123	67,372	(10,095)
State and city	3,945	15,129	(6,925)
Total deferred	51,068	82,501	(17,020)
Total income taxes applicable to pre-tax income	$ 356,628	$ 139,400	$ 183,892

Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income taxes expense difference from the amount computed by applying the statutory federal income tax rate to pre-tax income
Income taxes at statutory rate	$ 382,476	$ 181,752	$ 258,923
Increase (decrease) in taxes:
Tax-exempt income	(32,466)	(31,071)	(31,668)
State and city income taxes, net of federal income tax effect	38,360	12,503	(24,335)
Low income housing credits	(29,882)	(20,749)	(21,170)
Other	(1,860)	(3,035)	2,142
Income taxes	$ 356,628	$ 139,400	$ 183,892

Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Deferred tax assets (liabilities)
Postretirement and other employee benefits	$ 48,863	$ 46,316	$ 43,874
Losses on loans and other assets	550,970	642,427	389,177
Incentive compensation plans	27,388	27,835	28,489
Interest on loans	43,563	35,772	38,835
Retirement benefits	21,694	14,305	62,185
Stock-based compensation	70,641	69,881	58,837
Unrealized investment losses	54,557	140,821	331,616
Depreciation and amortization	13,332	6,274	10,141
Capitalized servicing rights	0	0	3,243
Other	51,768	40,281	28,478
Gross deferred tax assets	882,776	1,023,912	994,875
Leasing transactions	(294,510)	(306,799)	(316,444)
Capitalized servicing rights	(14,739)	(8,412)	0
Interest on subordinated note exchange	(13,534)	(15,051)	(16,264)
Other	(36,080)	(32,617)	(9,691)
Gross deferred tax liabilities	(358,863)	(362,879)	(342,399)
Net deferred tax asset	$ 523,913	$ 661,033	$ 652,476

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Federal, State and Local Tax [Member]
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning Balance	$ 28,297	$ 38,287	$ 120,044
Increases in unrecognized tax benefits as a result of tax positions taken during the period		400	2,405
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination	(1,403)	(9,902)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities	(967)	(825)	(31,763)
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years	(1,074)		(52,399)
Unrecognized tax benefits acquired in a business combination		337
Ending Balance	24,853	28,297	38,287
Less: Federal, state and local income tax benefits	0
Net unrecognized tax benefits if recognized, would impact the effective income tax rate	0
Accrued Interest [Member]
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning Balance	19,508	17,556	26,368
Increases in unrecognized tax benefits as a result of tax positions taken during prior years	11,468	3,675	15,837
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination	(670)	(1,392)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities	(549)	(331)	(9,116)
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years	(9,061)		(15,533)
Ending Balance	20,696	19,508	17,556
Less: Federal, state and local income tax benefits	0
Net unrecognized tax benefits if recognized, would impact the effective income tax rate	0
Unrecognized Income Tax Benefits [Member]
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Beginning Balance	47,805	55,843	146,412
Increases in unrecognized tax benefits as a result of tax positions taken during the period		400	2,405
Increases in unrecognized tax benefits as a result of tax positions taken during prior years	11,468	3,675	15,837
Decreases in unrecognized tax benefits because applicable returns are no longer subject to examination	(2,073)	(11,294)
Decreases in unrecognized tax benefits as a result of settlements with taxing authorities	(1,516)	(1,156)	(40,879)
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years	(10,135)		(67,932)
Unrecognized tax benefits acquired in a business combination		337
Ending Balance	45,549	$ 47,805	$ 55,843
Less: Federal, state and local income tax benefits	(15,478)
Net unrecognized tax benefits if recognized, would impact the effective income tax rate	$ 30,071

Income Taxes (Details Textuals)	12 Months Ended
Income Taxes (Details Textuals)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)
Income Taxes (Textuals) [Abstract]
Tax bad debt reserve	$ 79,121,000
Income taxes attributable to gains or losses on bank investment securities	32,778,000	$ 53,824,000	$ 57,859,000
Minimum alternative tax expense recognized for gains or losses on bank investment securities	$ 0	$ 0	$ 0
Number of state and local jurisdictions where company files income tax returns	40

Comprehensive income (Details) - USD ($) $ in Thousands	12 Months Ended
Comprehensive income (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Available for sale ("AFS") investment securities with other-than-temporary impairment ("OTTI"):
Securities with OTTI charges ( AFS)	$ (104,039)
Securities with OTTI charges, income taxes	40,566	$ 103,409
Securities with OTTI charges, net	(63,473)	(160,954)
Less: OTTI charges recognized in net income AFS	(81,199)
Net OTTI losses recognized in earnings	(86,281)	(138,297)	$ (182,222)
Less: OTTI charges recognized in net income, income taxes	31,552	54,115
Less: OTTI charges recognized in net income, net	(49,647)	(84,182)
Net unrealized losses on investment securities with OTTI AFS	(22,840)
Net unrealized losses on investment securities with OTTI, before-tax amount	(29,666)	(126,066)
Net unrealized losses on investment securities with OTTI, income taxes	9,014	49,294
Net unrealized losses on investment securities with OTTI, net	(13,826)	(76,772)
AFS investment securities - all other:
Unrealized holding gains/losses, before-tax amount	132,128	375,733	(1,001,417)
Unrealized holding gains/losses, income taxes	(51,624)	(144,228)	331,461
Unrealized holding gains/losses, net	80,504	231,505	(669,956)
Add: transfer of investment securities from AFS to HTM, before-tax amount			86,943
Add: transfer of investment securities from AFS to HTM, income taxes			(20,972)
Add: transfer of investment securities from AFS to HTM, net			65,971
Less: reclassification adjustment for gains/losses realized in net income, before-tax amount	1,581	219	(180,274)
Less: reclassification adjustment for gains/losses realized in net income, income taxes	(610)	(85)	10,863
Securities with OTTI charges ( AFS)	(104,039)
Less: reclassification adjustment for gains/losses realized in net income, net	971	134	(169,411)
Securities with OTTI charges, before-tax amount	(115,947)	(264,363)	(182,222)
Securities with OTTI charges, income taxes	40,566	103,409
Securities with OTTI charges, net	(63,473)	(160,954)
Total AFS investment securities-all other, before-tax amount	234,586	639,877	(734,200)
Total AFS investment securities-all other, income taxes	(91,580)	(247,552)	299,626
Total AFS investment securities-all other, net	143,006	392,325	(434,574)
Securities with OTTI charges, Before Tax	(11,908)
Securities with OTTI charges, Tax	4,674
Securities with OTTI charges, after tax	(7,234)
Less: Impairment previously reflected in other comprehensive income, before tax	(7,984)
Less: Impairment previously reflected in other comprehensive income, Tax	3,134
Less: Impairment previously reflected in other comprehensive income, after tax	(4,850)
Less: OTTI charges recognized in net income, before tax	(5,082)
Less: OTTI charges recognized in net income, tax	1,995
Less: OTTI charges recognized in net income, after tax	(3,087)
Net change for investment securities with OTTI, before tax	1,158
Net change for investment securities with OTTI, tax	(455)
Net change for investment securities with OTTI, after tax	703
Unrealized holding losses transferred, before-tax amount			(86,943)
Unrealized holding losses transferred, income taxes			20,972
Unrealized holding losses transferred, net			(65,971)
Reclassification to income of unrealised holding losses on securities previously transferred from AFS to HTM	8,264	14,027	5,101
Reclassification to income of unrealised holding losses on securities previously transferred from AFS to HTM, tax	(3,243)	7,463	(1,818)
Reclassification to income of unrealised holding losses on securities previously transferred from AFS to HTM, net of tax	5,021	21,490	3,283
Total unrealized holding losses on investment securities transferred, before-tax amount	9,422		(81,842)
Total unrealized holding losses on investment securities transferred, income taxes	(3,698)		19,154
Total unrealized holding losses on investment securities transferred, before-tax amount,net	5,724		(62,688)
Net unrealized gains/losses on investment securities, before-tax amount	221,168	527,838	(816,042)
Net unrealized gains/losses on investment securities, income taxes	(86,264)	(190,795)	318,780
Unrealized gains (losses) on investment securities	134,904	337,043	(497,262)
Unrealized losses on terminated cash flow hedges, before-tax amount			(20,225)
Unrealized losses on terminated cash flow hedges, income taxes			7,887
Unrealized losses on terminated cash flow hedges, net			(12,338)
Reclassification to income for amortization of losses on terminated cash flow hedges to income, before-tax amount	(448)	10,761	25,234
Reclassification to income for amortization of losses on terminated cash flow hedges to income, income taxes	167	(4,204)	(9,848)
Reclassification to income for amortization of losses on terminated cash flow hedges to income, net	(281)	6,557	15,386
Total cash flow hedges, before-tax amount			5,009
Total cash flow hedges, income taxes			(1,961)
Total cash flow hedges, net			3,048
Defined benefit plans liability adjustment, before-tax amount	(6,331)	93,823	(210,161)
Defined benefit plans liability adjustment, income taxes	2,485	(36,539)	82,316
Defined benefit plans liability adjustment, net	(3,846)	57,284	(127,845)
Total Comprehensive Income, before-tax amount	214,389	632,422	(1,021,194)
Total Comprehensive Income, income taxes	(83,612)	(231,538)	399,135
Total Comprehensive Income, net	130,777	400,884	(622,059)
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance	(335,997)	(736,881)	(114,822)
Net gain (loss) during period	130,777	400,884	(622,059)
Ending Balance	(205,220)	(335,997)	(736,881)
Comprehensive income (Textuals) [Abstract]
Collateralized mortgage obligations transferred from available-for-sale investment securities portfolio to held-to-maturity portfolio, fair value			298,000
Collateralized mortgage obligations transferred from available-for-sale investment securities portfolio to held-to-maturity portfolio, cost basis			385,000
Cash flow hedges [Member]
AFS investment securities - all other:
Total Comprehensive Income, net	(281)	6,557	3,048
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance	674	(5,883)	(8,931)
Net gain (loss) during period	(281)	6,557	3,048
Ending Balance	393	674	(5,883)
Defined benefit plans [Member]
AFS investment securities - all other:
Total Comprehensive Income, net	(3,846)	57,284	(127,845)
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance	(117,046)	(174,330)	(46,485)
Net gain (loss) during period	(3,846)	57,284	(127,845)
Ending Balance	(120,892)	(117,046)	(174,330)
With OTTI [Member]
AFS investment securities - all other:
Total Comprehensive Income, net	(10,281)	(76,772)
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance	(76,772)	0	0
Net gain (loss) during period	(10,281)	(76,772)
Ending Balance	(87,053)	(76,772)	0
All other [Member]
AFS investment securities - all other:
Total Comprehensive Income, net	145,185	413,815	(497,262)
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance	(142,853)	(556,668)	(59,406)
Net gain (loss) during period	145,185	413,815	(497,262)
Ending Balance	$ 2,332	$ (142,853)	$ (556,668)

International Activities (Details) - USD ($)	Dec. 31, 2010	Dec. 31, 2009
International Activities (Textuals) [Abstract]
Net assets identified with international activities	$ 112,851,000	$ 61,849,000
Loans to foreign borrowers	107,310,000	55,336,000
Deposits at Cayman Islands office	$ 1,605,916,000	$ 1,050,438,000

Commitments and contingencies (Details) $ in Thousands	12 Months Ended
Commitments and contingencies (Details) $ in Thousands	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Commitments to extend credit
Home equity lines of credit	$ 6,281,366	$ 6,482,987
Commercial real estate loans to be sold	72,930	180,498
Other commercial real estate and construction	1,672,006	1,360,805
Residential real estate loans to be sold	161,583	631,090
Other residential real estate	151,111	127,788
Commercial and other	8,332,199	7,155,188
Standby letters of credit	3,917,318	3,828,586
Commercial letters of credit	76,962	66,377
Financial guarantees and indemnification contracts	1,609,944	1,633,549
Commitments to sell real estate loans	734,696	1,239,001
Minimum lease payments under noncancellable operating leases
2011	78,325
2012	75,033
2013	60,712
2014	50,493
2015	42,741
Later years	137,592
Total	444,896
Commitments and contingencies (Textuals) [Abstract]
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program	$ 1,600,000	$ 1,300,000
Period of noncancellable operating lease in years	29
Outstanding loan principal balances reinsured	$ 85,000
Assets of subsidiaries providing reinsurance to satisfy claims	71,000
2010 - 2013 [Member]
Company's significant commitments
Naming rights of football stadium per year	5,000
2014 - 2017 [Member]
Company's significant commitments
Naming rights of football stadium per year	$ 6,000

Segment information (Details 1) - USD ($)	12 Months Ended
Segment information (Details 1) - USD ($)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Income taxes (benefit)	$ (356,628,000)	$ (139,400,000)	$ (183,892,000)
Net income (loss)	(736,161,000)	(379,891,000)	(555,887,000)
Segment information (Textuals) [Abstract]
Taxable Equivalent Adjustment	$ 24,023,000	21,829,000	21,861,000
Percent of maximum revenue from single customer on total revenue	10.00%
Business Banking [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	$ (98,566,000)	(124,042,000)	(120,060,000)
Commercial Banking [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	(314,167,000)	(239,433,000)	(213,169,000)
Commercial Real Estate [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	(203,087,000)	(155,354,000)	(164,291,000)
Discretionary Portfolio [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	38,566,000	28,023,000	48,065,000
Residential Mortgage Banking [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	(11,140,000)	13,044,000	48,180,000
Retail Banking [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	(225,295,000)	(237,262,000)	(250,005,000)
All Other [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Net income (loss)	77,528,000	335,133,000	95,393,000
Intersegment Activity Eliminated In Consolidated Totals [Member]
Intersegment activity eliminated in arriving at consolidated totals included in the All Other category
Revenues	(41,508,000)	(47,114,000)	(42,738,000)
Expenses	(15,527,000)	(19,164,000)	(19,198,000)
Income taxes (benefit)	(10,572,000)	(11,373,000)	(9,578,000)
Net income (loss)	$ (15,409,000)	$ (16,577,000)	$ (13,962,000)

Regulatory Matters (Details Textuals) - USD ($)	Dec. 31, 2010	Dec. 31, 2009
Regulatory matters (Textuals) [Abstract]
Funds available for payment of dividends to M&T from banking subsidiaries	$ 1,400,000,000
Required subsidiary noninterest-earning reserves against certain deposit liabilities	$ 196,402,000	$ 162,952,000
Minimum "Tier 1 capital" ratio required for capital adequacy	4.00%
Minimum "Total capital" ratio required for capital adequacy	8.00%
Minimum "Leverage" ratio required for capital adequacy	3.00%
Minimum "Tier 1" capital ratio to be considered well capitalized	6.00%
Minimum "Total capital" ratio to be considered well capitalized	10.00%
Minimum "Leverage" ratio to be considered well capitalized	5.00%

Relationship of M&T and AIB (Details)	Nov. 04, 2010 shares
Relationship of M&T and AIB (Textuals) [Abstract]
Number of M&T shares sold by AIB	26,700,000

Parent company financial statements (Details) - USD ($) $ in Thousands	Dec. 31, 2010	Dec. 31, 2009
Investments in consolidated subsidiaries
Investment in Bayview Lending Group LLC	$ 220,000
Other assets	4,138,092	$ 4,131,577
Total assets	68,021,263	68,880,399
Liabilities
Accrued interest and other liabilities	1,070,701	995,056
Long-term borrowings	7,840,151	10,240,016
Total liabilities	59,663,568	61,127,492
Shareholders' equity	8,357,695	7,752,907
Total liabilities and shareholders' equity	68,021,263	68,880,399
Parent Company [Member]
Assets
Cash	1,784	1,455
Due from consolidated bank subsidiaries
Money-market savings	481,340	327,029
Current income tax receivable	2,664	5,037
Other	0	55
Total due from consolidated bank subsidiaries	484,004	332,121
Investments in consolidated subsidiaries
Banks	9,048,703	8,559,692
Other	30,978	29,925
Investments in unconsolidated subsidiaries (note 19)	34,257	34,424
Investment in Bayview Lending Group LLC	219,800	245,568
Other assets	88,976	93,506
Total assets	9,908,502	9,296,691
Liabilities
Due to consolidated bank subsidiaries	20	0
Accrued interest and other liabilities	73,283	68,004
Long-term borrowings	1,477,504	1,475,780
Total liabilities	1,550,807	1,543,784
Shareholders' equity	8,357,695	7,752,907
Total liabilities and shareholders' equity	$ 9,908,502	$ 9,296,691