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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2012	Oct. 31, 2012
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Trading Symbol	MTB
Entity Registrant Name	M&T BANK CORP
Entity Central Index Key	0000036270
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		128,005,934

Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 1,622,928	$ 1,449,547
Interest-bearing deposits at banks	411,994	154,960
Federal funds sold		2,850
Trading account	526,844	561,834
Investment securities (includes pledged securities that can be sold or repledged of $1,826,216 at September 30, 2012; $1,826,011 at December 31, 2011)
Available for sale (cost: $5,091,116 at September 30, 2012; $6,312,423 at December 31, 2011)	5,183,878	6,228,560
Held to maturity (fair value: $1,074,771 at September 30, 2012; $1,012,562 at December 31, 2011)	1,121,325	1,077,708
Other (fair value: $318,801 at September 30, 2012; $366,886 at December 31, 2011)	318,801	366,886
Total investment securities	6,624,004	7,673,154
Loans and leases	64,335,438	60,377,875
Unearned discount	(223,483)	(281,870)
Loans and leases, net of unearned discount	64,111,955	60,096,005
Allowance for credit losses	(921,223)	(908,290)
Loans and leases, net	63,190,732	59,187,715
Premises and equipment	589,035	581,435
Goodwill	3,524,625	3,524,625
Core deposit and other intangible assets	129,628	176,394
Accrued interest and other assets	4,465,443	4,611,773
Total assets	81,085,233	77,924,287
Liabilities
Noninterest-bearing deposits	22,968,401	20,017,883
NOW accounts	1,499,915	1,912,226
Savings deposits	33,163,780	31,001,083
Time deposits	4,972,409	6,107,530
Deposits at Cayman Islands office	1,402,753	355,927
Total deposits	64,007,258	59,394,649
Federal funds purchased and agreements to repurchase securities	592,154	732,059
Other short-term borrowings		50,023
Accrued interest and other liabilities	1,570,758	1,790,121
Long-term borrowings	4,969,536	6,686,226
Total liabilities	71,139,706	68,653,078
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 381,500 shares at September 30, 2012 and December 31, 2011; Liquidation preference of $10,000 per share: 50,000 shares at September 30, 2012 and December 31, 2011	870,416	864,585
Common stock, $.50 par, 250,000,000 shares authorized, 127,403,420 shares issued at September 30, 2012; 125,683,398 shares issued at December 31, 2011	63,702	62,842
Common stock issuable, 57,316 shares at September 30, 2012; 68,220 shares at December 31, 2011	3,451	4,072
Additional paid-in capital	2,951,248	2,828,986
Retained earnings	6,286,785	5,867,165
Accumulated other comprehensive income (loss), net	(230,075)	(356,441)
Total shareholders' equity	9,945,527	9,271,209
Total liabilities and shareholders' equity	$ 81,085,233	$ 77,924,287

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Pledged securities that can be sold or repledged	$ 1,826,216	$ 1,826,011
Investment securities, available for sale, amortized cost	5,091,116	6,312,423
Investment securities, held to maturity, fair value	1,074,771	1,012,562
Other, fair value	$ 318,801	$ 366,886
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	381,500	381,500
Preferred stock, shares outstanding	50,000	50,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Liquidation preference, per share	10,000	10,000
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	127,403,420	125,683,398
Common stock issuable, shares	57,316	68,220

Consolidated Statement of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest income
Loans and leases, including fees	$ 687,466	$ 655,581	$ 2,010,529	$ 1,873,860
Deposits at banks	139	1,164	1,119	1,679
Federal funds sold	6	23	17	51
Agreements to resell securities		4		132
Trading account	214	312	849	982
Investment securities
Fully taxable	54,959	60,880	177,647	192,369
Exempt from federal taxes	2,067	2,387	6,171	7,014
Total interest income	744,851	720,351	2,196,332	2,076,087
Interest expense
NOW accounts	327	354	1,034	830
Savings deposits	16,510	22,664	51,633	62,660
Time deposits	10,843	17,684	36,706	56,065
Deposits at Cayman Islands office	336	188	781	775
Short-term borrowings	365	222	1,016	861
Long-term borrowings	53,748	62,520	174,068	183,171
Total interest expense	82,129	103,632	265,238	304,362
Net interest income	662,722	616,719	1,931,094	1,771,725
Provision for credit losses	46,000	58,000	155,000	196,000
Net interest income after provision for credit losses	616,722	558,719	1,776,094	1,575,725
Other income
Mortgage banking revenues	106,812	38,141	232,518	125,448
Service charges on deposit accounts	114,463	121,577	334,334	351,024
Trust income	115,709	113,652	354,937	218,565
Brokerage services income	14,114	13,907	44,187	43,129
Trading account and foreign exchange gains	8,469	4,176	25,278	19,253
Gain on bank investment securities	372	89	9	150,186
Total other-than-temporary impairment ("OTTI") losses	(2,134)	(7,649)	(26,246)	(50,374)
Portion of OTTI losses recognized in other comprehensive income (before taxes)	(3,538)	(1,993)	(7,085)	(1,839)
Net OTTI losses recognized in earnings	(5,672)	(9,642)	(33,331)	(52,213)
Equity in earnings of Bayview Lending Group LLC	(5,183)	(6,911)	(16,570)	(18,812)
Other revenues from operations	96,649	93,393	272,744	347,878
Total other income	445,733	368,382	1,214,106	1,184,458
Other expense
Salaries and employee benefits	321,746	325,197	991,530	891,465
Equipment and net occupancy	64,248	68,101	194,667	184,434
Printing, postage and supplies	8,272	10,593	31,512	29,518
Amortization of core deposit and other intangible assets	14,085	17,401	46,766	44,455
FDIC assessments	23,801	26,701	77,712	72,404
Other costs of operations	183,875	214,026	540,927	516,209
Total other expense	616,027	662,019	1,883,114	1,738,485
Income before taxes	446,428	265,082	1,107,086	1,021,698
Income taxes	152,966	81,974	373,781	309,959
Net income	293,462	183,108	733,305	711,739
Net income available to common shareholders
Basic	273,885	164,668	676,821	651,941
Diluted	$ 273,896	$ 164,671	$ 676,842	$ 651,966
Net income per common share
Basic	$ 2.18	$ 1.32	$ 5.39	$ 5.34
Diluted	2.17	1.32	5.37	5.32
Cash dividends per common share	$ 0.70	$ 0.70	$ 2.10	$ 2.10
Average common shares outstanding
Basic	125,819	124,575	125,510	122,005
Diluted	126,292	124,860	125,936	122,521

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 293,462	$ 183,108	$ 733,305	$ 711,739
Other comprehensive income, net of tax and reclassification adjustments:
Net unrealized gains on investment securities	42,560	34,862	111,931	6,970
Reclassification to income for amortization of gains on terminated cash flow hedges		(70)	(112)	(211)
Foreign currency translation adjustment	482	(699)	351	(503)
Defined benefit plans liability adjustment	4,732	2,143	14,196	6,431
Total other comprehensive income	47,774	36,236	126,366	12,687
Total comprehensive income	$ 341,236	$ 219,344	$ 859,671	$ 724,426

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Net of tax amount of other comprehensive income (loss) attributable to the parent entity.

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- Definition

Net of tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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+ Details

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities
Net income	$ 733,305	$ 711,739
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	155,000	196,000
Depreciation and amortization of premises and equipment	63,344	60,220
Amortization of capitalized servicing rights	44,678	39,895
Amortization of core deposit and other intangible assets	46,766	44,455
Provision for deferred income taxes	108,699	14,530
Asset write-downs	46,505	64,153
Net gain on sales of assets	(5,070)	(183,861)
Net change in accrued interest receivable, payable	(10,712)	(6,206)
Net change in other accrued income and expense	(204,876)	(21,427)
Net change in loans originated for sale	(528,606)	316,623
Net change in trading account assets and liabilities	24,743	49,376
Net cash provided by operating activities	473,776	1,285,497
Cash flows from investing activities
Proceeds from sales of investment securities, Available for sale	49,430	1,909,427
Proceeds from sales of investment securities, Other	61,648	106,925
Proceeds from maturities of investment securities, Available for sale	1,155,603	1,007,612
Proceeds from maturities of investment securities, Held to maturity	237,933	180,475
Purchases of investment securities Available for sale	(26,115)	(2,569,168)
Purchases of investment securities, Held to maturity	(282,704)	(19,386)
Purchases of investment securities, Other	(13,563)	(30,438)
Net increase in loans and leases	(3,572,339)	(522,571)
Net (increase) decrease in interest-bearing deposits at banks	(257,034)	480,708
Net decrease in agreements to resell securities		15,000
Other investments, net	(7,447)	(9,856)
Capital expenditures, net	(65,947)	(38,030)
Acquisitions, net of cash acquired Banks and bank holding companies		178,940
Purchase of Wilmington Trust Corporation preferred stock		(330,000)
Proceeds from sales of real estate acquired in settlement of loans	80,762	181,310
Other, net	(86,649)	73,739
Net cash (used) provided by investing activities	(2,726,422)	614,687
Cash flows from financing activities
Net increase in deposits	4,624,134	825,434
Net decrease in short-term borrowings	(189,906)	(400,752)
Payments on long-term borrowings	(1,727,313)	(1,750,195)
Proceeds from issuance of preferred stock		495,000
Redemption of preferred stock		(370,000)
Dividends paid - common	(267,481)	(261,589)
Dividends paid - preferred	(31,494)	(24,815)
Other, net	15,237	7,035
Net cash provided (used) by financing activities	2,423,177	(1,479,882)
Net increase in cash and cash equivalents	170,531	420,302
Cash and cash equivalents at beginning of period	1,452,397	933,755
Cash and cash equivalents at end of period	1,622,928	1,354,057
Supplemental disclosure of cash flow information
Interest received during the period	2,187,027	2,087,083
Interest paid during the period	280,983	320,758
Income taxes paid during the period	272,502	308,057
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	$ 36,881	51,046
Acquisitions: Fair value of:
Assets acquired (noncash)		10,666,102
Liabilities assumed		10,044,555
Common stock issued		405,557
Retirement of Wilmington Trust Corporation preferred stock		$ 330,000

Consolidated Statement of Changes in Shareholders Equity - USD ($) $ in Thousands	Total	Preferred stock [Member]	Common stock [Member]	Common stock issuable [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss), net [Member]	Treasury stock [Member]
Beginning Balance at Dec. 31, 2010	$ 8,357,695	$ 740,657	$ 60,198	$ 4,189	$ 2,398,615	$ 5,426,701	$ (205,220)	$ (67,445)
Total comprehensive income	724,426					711,739	12,687
Acquisition of Wilmington Trust Corporation-common stock issued	405,557		2,348		403,209
Partial redemption of Series A preferred stock	(370,000)	(370,000)
Conversion of Series B preferred stock into 433,144 shares of common stock		(26,500)	192		21,754			4,554
Issuance of Series D preferred stock	495,000	500,000			(5,000)
Preferred stock cash dividends	(34,125)					(34,125)
Amortization of preferred stock discount		18,560				(18,560)
Stock-based compensation plans:
Compensation expense, net	32,352		36		650			31,666
Exercises of stock options, net	23,444		29		(6,691)			30,106
Directors' stock plan	1,028		2		414			612
Deferred compensation plans, net, including dividend equivalents	40			(123)	(203)	(141)		$ 507
Other	1,395				1,395
Common stock cash dividends-$2.10 per share	(261,686)					(261,686)
Ending Balance at Sep. 30, 2011	9,375,126	862,717	62,805	4,066	2,814,143	5,823,928	(192,533)
Beginning Balance at Dec. 31, 2011	9,271,209	864,585	62,842	4,072	2,828,986	5,867,165	(356,441)
Total comprehensive income	859,671					733,305	126,366
Preferred stock cash dividends	(40,088)					(40,088)
Amortization of preferred stock discount		5,831				(5,831)
Stock-based compensation plans:
Compensation expense, net	37,883		228		37,655
Exercises of stock options, net	72,484		545		71,939
Stock purchase plan	10,101		75		10,026
Directors' stock plan	1,121		7		1,114
Deferred compensation plans, net, including dividend equivalents	(160)		5	(621)	576	(120)
Other	952				952
Common stock cash dividends-$2.10 per share	(267,646)					(267,646)
Ending Balance at Sep. 30, 2012	$ 9,945,527	$ 870,416	$ 63,702	$ 3,451	$ 2,951,248	$ 6,286,785	$ (230,075)

Consolidated Statement of Changes in Shareholders Equity (Parenthetical) - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Common stock per share dividend amount	$ 2.10	$ 2.10
Preferred stock [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144
Common stock [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144
Additional paid-in capital [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144
Retained earnings [Member]
Common stock per share dividend amount	$ 2.10	$ 2.10
Treasury stock [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144

- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4, 5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Significant accounting policies

9 Months Ended

Sep. 30, 2012

Significant accounting policies

1. Significant accounting policies

The consolidated financial statements of M&T Bank Corporation (“M&T”) and subsidiaries (“the Company”) were compiled in accordance with generally accepted accounting principles (“GAAP”) using the accounting policies set forth in note 1 of Notes to Financial Statements included in the 2011 Annual Report. In the opinion of management, all adjustments necessary for a fair presentation have been made and were all of a normal recurring nature.

Acquisitions

9 Months Ended

Sep. 30, 2012

Acquisitions

2. Acquisitions

On August 27, 2012, M&T announced that it had entered into a definitive agreement with Hudson City Bancorp, Inc. (“Hudson City”), headquartered in Paramus, New Jersey, under which Hudson City will be acquired by M&T. Pursuant to the terms of the agreement, Hudson City shareholders will receive consideration valued at ..08403 of an M&T share in the form of either M&T common stock or cash, based on the election of each Hudson City shareholder, subject to proration as specified in the merger agreement (which provides for an aggregate split of total consideration of 60% common stock of M&T and 40% cash).

At September 30, 2012, Hudson City had $41.9 billion of assets, including $27.8 billion of loans and $12.5 billion of investment securities, and $37.2 billion of liabilities, including $24.0 billion of deposits. After the merger is completed, M&T expects to repay approximately $13 billion of Hudson City’s long-term borrowings by liquidating its comparably-sized investment securities portfolio. The merger is subject to a number of conditions, including regulatory approvals and approval by common shareholders of M&T and Hudson City, and is expected to be completed by mid-year 2013.

On May 16, 2011, M&T acquired all of the outstanding common stock of Wilmington Trust Corporation (“Wilmington Trust”), headquartered in Wilmington, Delaware, in a stock-for-stock transaction. Wilmington Trust operated 55 banking offices in Delaware and Pennsylvania at the date of acquisition. The results of operations acquired in the Wilmington Trust transaction have been included in the Company’s financial results since May 16, 2011. Wilmington Trust shareholders received .051372 shares of M&T common stock in exchange for each share of Wilmington Trust common stock, resulting in M&T issuing a total of 4,694,486 common shares with an acquisition date fair value of $406 million.

The Wilmington Trust transaction has been 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 approximately $10.8 billion, including $6.4 billion of loans and leases (including approximately $3.2 billion of commercial real estate loans, $1.4 billion of commercial loans and leases, $1.1 billion of consumer loans and $680 million of residential real estate loans). Liabilities assumed aggregated $10.0 billion, including $8.9 billion of deposits. The common stock issued in the transaction added $406 million to M&T’s common shareholders’ equity. Immediately prior to the closing of the Wilmington Trust transaction, M&T redeemed the $330 million of preferred stock issued by Wilmington Trust as part of the Troubled Asset Relief Program – Capital Purchase Program (“TARP”) of the U.S. Department of Treasury (“U.S. Treasury”). In connection with the acquisition, the Company recorded $112 million of core deposit and other intangible assets. The core deposit and other intangible assets are generally being amortized over periods of 5 to 7 years using an accelerated method. There was no goodwill recorded as a result of the transaction, however, a non-taxable gain of $65 million was realized, which represented the excess of the fair value of assets acquired less liabilities assumed over consideration exchanged. The acquisition of Wilmington Trust added to M&T’s market-leading position in the Mid-Atlantic region by giving M&T the leading deposit market share in Delaware.

The consideration paid for Wilmington Trust’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the acquisition date were as follows:


	(in thousands)
Purchase price:
Value of:
Common shares issued (4,694,486 shares)	$	405,557
Preferred stock purchased from U.S. Treasury		330,000

Total purchase price		735,557

Identifiable assets:
Cash and due from banks		178,940
Interest-bearing deposits at banks		2,606,265
Other short-term investments		57,817
Investment securities		510,390
Loans and leases		6,410,430
Core deposit and other intangibles		112,094
Other assets		969,106

Total identifiable assets		10,845,042

Liabilities:
Deposits		8,864,161
Short-term borrowings		147,752
Long-term borrowings		600,830
Other liabilities		431,812

Total liabilities		10,044,555

Net gain resulting from acquisition	$	64,930

The following table presents certain pro forma information as if Wilmington Trust had been included in the Company’s results of operations for the nine months ended September 30, 2011 rather than since the acquisition date on May 16, 2011. These results combine the historical results of Wilmington Trust 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 as indicated. In particular, no adjustments have been made to eliminate the amount of Wilmington Trust’s provision for credit losses of $41 million or the impact of other-than-temporary impairment losses of $5 million recognized by Wilmington Trust during the first quarter of 2011 that may not have been necessary had the acquired loans and investment securities been recorded at fair value as of the beginning of 2011. Additionally, the Company expects to achieve 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 Nine months ended
	September 30, 2011
	(in thousands)
Total revenues (a)	$	3,190,437
Net income		663,048

(a)

Represents net interest income plus other income.

In connection with the acquisition, the Company incurred merger-related expenses related to systems conversions and other costs of integrating and conforming acquired operations with and into the Company. 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 termination of existing contractual arrangements of Wilmington Trust to purchase various services; initial marketing and promotion expenses designed to introduce M&T Bank to its new customers; severance for former employees; travel costs; and printing, postage, supplies and other costs of completing the transactions and commencing operations in new markets and offices.

A summary of merger-related expenses included in the consolidated statement of income follows:


	Three months ended				Nine months ended
	September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
	(in thousands)
Salaries and employee benefits	$	—		285	$	4,997		15,597
Equipment and net occupancy		—		119		15		223
Printing, postage and supplies		—		723		—		1,188
Other costs of operations		—		24,876		4,867		50,286

	$	—		26,003	$	9,879		67,294

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph F4
-Subparagraph e
-Appendix F

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investment securities

9 Months Ended

Sep. 30, 2012

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)
September 30, 2012
Investment securities available for sale:
U.S. Treasury and federal agencies	$	55,288		1,057		—	$	56,345
Obligations of states and political subdivisions		33,402		588		10		33,980
Mortgage-backed securities:
Government issued or guaranteed		3,502,237		246,190		175		3,748,252
Privately issued residential		1,198,896		4,929		148,757		1,055,068
Privately issued commercial		10,837		—		269		10,568
Collateralized debt obligations		43,294		15,147		1,240		57,201
Other debt securities		136,418		2,146		29,159		109,405
Equity securities		110,744		9,636		7,321		113,059

		5,091,116		279,693		186,931		5,183,878

Investment securities held to maturity:
Obligations of states and political subdivisions		192,621		8,848		29		201,440
Mortgage-backed securities:
Government issued or guaranteed		669,169		37,259		—		706,428
Privately issued		248,441		334		92,966		155,809
Other debt securities		11,094		—		—		11,094

		1,121,325		46,441		92,995		1,074,771

Other securities		318,801		—		—		318,801

Total	$	6,531,242		326,134		279,926	$	6,577,450

December 31, 2011
Investment securities available for sale:
U.S. Treasury and federal agencies	$	69,468		1,255		—	$	70,723
Obligations of states and political subdivisions		39,518		771		20		40,269
Mortgage-backed securities:
Government issued or guaranteed		4,344,116		177,392		275		4,521,233
Privately issued residential		1,369,371		6,373		239,488		1,136,256
Privately issued commercial		17,679		—		2,650		15,029
Collateralized debt obligations		43,834		11,154		2,488		52,500
Other debt securities		216,700		4,588		44,443		176,845
Equity securities		211,737		8,468		4,500		215,705

		6,312,423		210,001		293,864		6,228,560

Investment securities held to maturity:
Obligations of states and political subdivisions		188,680		9,141		28		197,793
Mortgage-backed securities:
Government issued or guaranteed		608,533		24,881		—		633,414
Privately issued		268,642		—		99,140		169,502
Other debt securities		11,853		—		—		11,853

		1,077,708		34,022		99,168		1,012,562

Other securities		366,886		—		—		366,886

Total	$	7,757,017		244,023		393,032	$	7,608,008

Gross realized gains on investment securities were $90 thousand and $150 million for the three-month and nine-month periods ended September 30, 2011, respectively. Gross realized gains were not significant in 2012. Gross realized losses on investment securities were not significant during the three-month and nine-month periods ended September 30, 2012 and 2011. During the second quarter of 2011, the Company sold residential mortgage-backed securities guaranteed by the Federal National Mortgage Association (“Fannie Mae”) and Federal Home Loan Mortgage Corporation (“Freddie Mac”) having an aggregate amortized cost of approximately $1.0 billion which resulted in a gain of $66 million (pre-tax). The Company also sold trust preferred securities and collateralized debt obligations during the second quarter of 2011 having an aggregate amortized cost of $136 million and $100 million, respectively, which resulted in gains of $25 million (pre-tax) and $20 million (pre-tax), respectively. During the first quarter of 2011, the Company sold residential mortgage-backed securities guaranteed by Fannie Mae and Freddie Mac having an aggregate amortized cost of approximately $484 million which resulted in a gain of $39 million (pre-tax).

The Company recognized pre-tax other-than-temporary impairment losses of $6 million and $33 million during the three months and nine months ended September 30, 2012, respectively, and $10 million and $52 million during the three months and nine months ended September 30, 2011, respectively, related to privately issued mortgage-backed securities. 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. The other-than-temporary losses represent management’s estimate of credit losses inherent in the debt securities considering projected cash flows using assumptions of delinquency rates, loss severities, and other estimates for future collateral performance.

The following table displays changes in credit losses associated with debt securities for which other-than-temporary impairment losses have been previously recognized in earnings for the three months and nine months ended September 30, 2012 and 2011:


	Three months ended September 30
	2012			2011
	(in thousands)
Beginning balance	$	264,197			298,141
Additions for credit losses not previously recognized		5,672			9,642
Reductions for increases in cash flows		—			(90	)
Reductions for realized losses		(67,926	)		(23,127	)

Ending balance	$	201,943			284,566


	Nine months ended September 30
	2012			2011
	(in thousands)
Beginning balance	$	285,399			327,912
Additions for credit losses not previously recognized		33,331			52,213
Reductions for increases in cash flows		—			(5,110	)
Reductions for realized losses		(116,787	)		(90,449	)

Ending balance	$	201,943			284,566

At September 30, 2012, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:


	Amortized cost		Estimated fair value
	(in thousands)
Debt securities available for sale:
Due in one year or less	$	33,460		33,496
Due after one year through five years		42,405		43,791
Due after five years through ten years		8,611		9,409
Due after ten years		183,926		170,235

		268,402		256,931
Mortgage-backed securities available for sale		4,711,970		4,813,888

	$	4,980,372		5,070,819

Debt securities held to maturity:
Due in one year or less	$	36,459		36,660
Due after one year through five years		45,054		47,410
Due after five years through ten years		110,731		116,979
Due after ten years		11,471		11,485

		203,715		212,534
Mortgage-backed securities held to maturity		917,610		862,237

	$	1,121,325		1,074,771

A summary of investment securities that as of September 30, 2012 and December 31, 2011 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)
September 30, 2012
Investment securities available for sale:
Obligations of states and political subdivisions	$	979		(6	)		685		(4	)
Mortgage-backed securities:
Government issued or guaranteed		5,838		(28	)		9,319		(147	)
Privately issued residential		81,620		(454	)		828,916		(148,303	)
Privately issued commercial		—		—			9,744		(269	)
Collateralized debt obligations		3,136		(30	)		5,842		(1,210	)
Other debt securities		—		—			93,266		(29,159	)
Equity securities		5,486		(3,820	)		1,580		(3,501	)

		97,059		(4,338	)		949,352		(182,593	)

Investment securities held to maturity:
Obligations of states and political subdivisions		2,839		(6	)		2,522		(23	)
Privately issued mortgage-backed securities		—		—			155,189		(92,966	)

		2,839		(6	)		157,711		(92,989	)

Total	$	99,898		(4,344	)		1,107,063		(275,582	)

December 31, 2011
Investment securities available for sale:
Obligations of states and political subdivisions	$	—		—			1,228		(20	)
Mortgage-backed securities:
Government issued or guaranteed		38,492		(190	)		6,017		(85	)
Privately issued residential		297,133		(14,188	)		751,077		(225,300	)
Privately issued commercial		—		—			15,029		(2,650	)
Collateralized debt obligations		2,871		(335	)		4,863		(2,153	)
Other debt securities		72,637		(9,883	)		73,635		(34,560	)
Equity securities		9,883		(4,500	)		—		—

		421,016		(29,096	)		851,849		(264,768	)

Investment securities held to maturity:
Obligations of states and political subdivisions		3,084		(4	)		1,430		(24	)
Privately issued mortgage-backed securities		1,883		(592	)		167,139		(98,548	)

		4,967		(596	)		168,569		(98,572	)

Total	$	425,983		(29,692	)		1,020,418		(363,340	)

The Company owned 250 individual investment securities with aggregate gross unrealized losses of $280 million at September 30, 2012. Approximately $242 million of the unrealized losses pertained to privately issued mortgage-backed securities with a cost basis of $1.3 billion. The Company also had $30 million of unrealized losses on available-for-sale trust preferred securities issued by financial institutions and securities backed by trust preferred securities having a cost basis of $133 million. Based on a review of each of the securities in the investment securities portfolio at September 30, 2012, 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 September 30, 2012, 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 September 30, 2012, the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $319 million of cost method investment securities.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Loans and leases and the allowance for credit losses

9 Months Ended

Sep. 30, 2012

Loans and leases and the allowance for credit losses

4. Loans and leases and the allowance for credit losses

The outstanding principal balance and the carrying amount of acquired loans that were recorded at fair value at the acquisition date that is included in the consolidated balance sheet is as follows:


	September 30,		December 31,
	2012		2011
	(in thousands)
Outstanding principal balance	$	7,338,476		9,203,366
Carrying amount:
Commercial, financial, leasing, etc.		977,430		1,331,198
Commercial real estate		2,962,899		3,879,518
Residential real estate		742,977		915,371
Consumer		1,700,161		2,033,700

	$	6,383,467		8,159,787

Purchased impaired loans included in the table above totaled $528 million at September 30, 2012 and $653 million at December 31, 2011, representing less than 1% of the Company’s assets as of each date.

Interest income on acquired loans that were recorded at fair value at the acquisition date was $87 million and $259 million for the three months and nine months ended September 30, 2012 and $97 million and $207 million for the three months and nine months ended September 30, 2011, respectively. At December 31, 2010 and September 30, 2011, the accretable yield on acquired loans was $457 million and $944 million, respectively. A summary of changes in the accretable yield for acquired loans for the three months and nine months ended September 30, 2012 follows:


	Three months ended September 30, 2012
	Purchased			Other
	impaired			acquired			Total
	(in thousands)
Balance at beginning of period	$	55,599			733,161			788,760
Interest income		(12,436	)		(74,936	)		(87,372	)
Reclassifications from (to) nonaccretable balance, net		542			—			542
Other (a)		—			1,382			1,382

Balance at end of period	$	43,705			659,607			703,312


	Nine months ended September 30, 2012
	Purchased			Other
	impaired			acquired			Total
	(in thousands)
Balance at beginning of period	$	30,805			807,960			838,765
Interest income		(29,721	)		(228,908	)		(258,629	)
Reclassifications from (to) nonaccretable balance, net		42,621			98,165			140,786
Other (a)		—			(17,610	)		(17,610	)

Balance at end of period	$	43,705			659,607			703,312

(a)

Other changes in expected cash flows including changes in interest rates and prepayments.

A summary of current, past due and nonaccrual loans as of September 30, 2012 and December 31, 2011 were as follows:


			30-89 Days past due		90 Days or more past due and accruing				Purchased impaired (b)		Nonaccrual		Total
	Current		30-89 Days past due		Non- acquired		Acquired (a)		Purchased impaired (b)		Nonaccrual		Total
					(in thousands)
September 30, 2012
Commercial, financial, leasing, etc.	$	16,496,862		50,980		2,574		14,919		17,434		121,806		16,704,575
Real estate:
Commercial		20,926,702		142,780		12,479		54,329		151,685		172,246		21,460,221
Residential builder and developer		781,007		26,920		5,009		23,870		244,017		225,529		1,306,352
Other commercial construction		2,056,594		36,738		8,077		6,388		69,337		26,709		2,203,843
Residential		9,534,751		270,560		276,314		41,577		41,297		182,217		10,346,716
Residential Alt-A		340,568		25,203		—		—		—		95,733		461,504
Consumer:
Home equity lines and loans		6,300,811		44,791		—		17,799		4,231		56,300		6,423,932
Automobile		2,429,579		40,813		—		345		—		25,537		2,496,274
Other		2,647,950		34,270		4,967		2,197		—		19,154		2,708,538

Total	$	61,514,824		673,055		309,420		161,424		528,001		925,231		64,111,955


December 31, 2011
Commercial, financial, leasing, etc.	$	15,493,803		37,112		7,601		8,560		23,762		163,598		15,734,436
Real estate:
Commercial		19,658,761		172,641		9,983		54,148		192,804		171,111		20,259,448
Residential builder and developer		845,680		49,353		13,603		21,116		297,005		281,576		1,508,333
Other commercial construction		2,393,304		41,049		968		23,582		78,105		106,325		2,643,333
Residential		6,626,182		256,017		250,472		37,982		56,741		172,681		7,400,075
Residential Alt-A		383,834		34,077		—		—		—		105,179		523,090
Consumer:
Home equity lines and loans		6,570,675		43,516		—		15,409		4,635		47,150		6,681,385
Automobile		2,644,330		48,342		—		601		—		26,835		2,720,108
Other		2,551,225		43,547		5,249		2,340		310		23,126		2,625,797

Total	$	57,167,794		725,654		287,876		163,738		653,362		1,097,581		60,096,005

(a)

Acquired loans that were recorded at fair value at acquisition date. This category does not include purchased impaired loans that are presented separately.

(b)

Accruing loans that were impaired at acquisition date and were recorded at fair value.

Changes in the allowance for credit losses for the three months ended September 30, 2012 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(in thousands)
Beginning balance	$	244,728			341,521			93,269			164,352			73,158		917,028
Provision for credit losses		439			9,891			8,247			26,962			461		46,000
Net charge-offs
Charge-offs		(8,874	)		(7,982	)		(8,687	)		(24,553	)		—		(50,096	)
Recoveries		1,174			1,421			1,139			4,557			—		8,291

Net charge-offs		(7,700	)		(6,561	)		(7,548	)		(19,996	)		—		(41,805	)

Ending balance	$	237,467			344,851			93,968			171,318			73,619		921,223

Changes in the allowance for credit losses for the three months ended September 30, 2011 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated			Total
	(in thousands)
Beginning balance	$	209,879			401,111			87,341			137,309			71,949			907,589
Provision for credit losses		23,145			(545	)		8,264			27,231			(95	)		58,000
Net charge-offs
Charge-offs		(12,073	)		(13,712	)		(12,135	)		(28,576	)		—			(66,496	)
Recoveries		2,613			839			1,750			4,230			—			9,432

Net charge-offs		(9,460	)		(12,873	)		(10,385	)		(24,346	)		—			(57,064	)

Ending balance	$	223,564			387,693			85,220			140,194			71,854			908,525

Changes in the allowance for credit losses for the nine months ended September 30, 2012 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(in thousands)
Beginning balance	$	234,022			367,637			91,915			143,121			71,595		908,290
Provision for credit losses		29,663			4,322			30,064			88,927			2,024		155,000
Net charge-offs
Charge-offs		(32,989	)		(31,578	)		(32,812	)		(77,155	)		—		(174,534	)
Recoveries		6,771			4,470			4,801			16,425			—		32,467

Net charge-offs		(26,218	)		(27,108	)		(28,011	)		(60,730	)		—		(142,067	)

Ending balance	$	237,467			344,851			93,968			171,318			73,619		921,223

Changes in the allowance for credit losses for the nine months ended September 30, 2011 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(in thousands)
Beginning balance	$	212,579			400,562			86,351			133,067			70,382		902,941
Provision for credit losses		44,957			36,965			37,759			74,847			1,472		196,000
Net charge-offs
Charge-offs		(41,023	)		(54,206	)		(44,174	)		(81,837	)		—		(221,240	)
Recoveries		7,051			4,372			5,284			14,117			—		30,824

Net charge-offs		(33,972	)		(49,834	)		(38,890	)		(67,720	)		—		(190,416	)

Ending balance	$	223,564			387,693			85,220			140,194			71,854		908,525

Despite the above allocation, the allowance for credit losses is general in nature and is available to absorb losses from any portfolio segment.

In establishing 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 a loan grading system which is applied to all commercial and commercial real estate credits on an individual loan basis. Loan officers are responsible for continually assigning grades to these loans based on standards outlined in the Company’s Credit Policy. Internal loan grades are also 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, geographic location, financial condition and performance, 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. As updated appraisals are obtained on individual loans or other events in the market place indicate that collateral values have significantly changed, individual loan grades are adjusted as appropriate. Changes in other factors cited may also lead to loan grade changes at anytime. Except for consumer and residential mortgage loans that are considered smaller balance homogenous loans and acquired loans that are evaluated on an aggregated basis, 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. Regardless of loan type, the Company considers a loan to be impaired if it qualifies as a troubled debt restructuring. 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 tables provide information with respect to loans and leases that were considered impaired as of September 30, 2012 and December 31, 2011 and for the three months and nine months ended September 30, 2012 and September 30, 2011.


	September 30, 2012						December 31, 2011
	Recorded investment		Unpaid principal balance		Related allowance		Recorded investment		Unpaid principal balance		Related allowance
	(in thousands)
With an allowance recorded:
Commercial, financial, leasing, etc.	$	106,448		126,156		29,911		118,538		145,510		48,674
Real estate:
Commercial		107,669		135,663		18,734		102,886		128,456		17,651
Residential builder and developer		134,298		260,010		34,228		159,293		280,869		52,562
Other commercial construction		74,306		77,938		7,749		20,234		24,639		3,836
Residential		103,184		121,141		5,027		101,882		119,498		4,420
Residential Alt-A		131,043		143,670		19,000		150,396		162,978		25,000
Consumer:
Home equity lines and loans		12,362		13,635		2,187		9,385		10,670		2,306
Automobile		50,886		50,886		15,012		53,710		53,710		11,468
Other		13,387		13,387		5,254		8,401		8,401		2,084

		733,583		942,486		137,102		724,725		934,731		168,001

With no related allowance recorded:
Commercial, financial, leasing, etc.		23,641		32,211		—		53,104		60,778		—
Real estate:
Commercial		70,667		92,453		—		71,636		91,118		—
Residential builder and developer		95,202		117,478		—		133,156		177,277		—
Other commercial construction		12,153		12,727		—		86,652		89,862		—
Residential		22,752		31,352		—		19,686		25,625		—
Residential Alt-A		34,533		63,703		—		34,356		60,942		—

		258,948		349,924		—		398,590		505,602		—

Total:
Commercial, financial, leasing, etc.		130,089		158,367		29,911		171,642		206,288		48,674
Real estate:
Commercial		178,336		228,116		18,734		174,522		219,574		17,651
Residential builder and developer		229,500		377,488		34,228		292,449		458,146		52,562
Other commercial construction		86,459		90,665		7,749		106,886		114,501		3,836
Residential		125,936		152,493		5,027		121,568		145,123		4,420
Residential Alt-A		165,576		207,373		19,000		184,752		223,920		25,000
Consumer:
Home equity lines and loans		12,362		13,635		2,187		9,385		10,670		2,306
Automobile		50,886		50,886		15,012		53,710		53,710		11,468
Other		13,387		13,387		5,254		8,401		8,401		2,084

Total	$	992,531		1,292,410		137,102		1,123,315		1,440,333		168,001


	Three months ended September 30, 2012						Three months ended September 30, 2011
			Interest income recognized						Interest income recognized
	Average recorded investment		Total		Cash basis		Average recorded investment		Total		Cash basis
	(in thousands)
Commercial, financial, leasing, etc.	$	141,166		1,507		1,507		152,368		1,172		1,166
Real estate:
Commercial		180,009		531		531		195,832		810		808
Residential builder and developer		237,847		476		370		338,897		422		98
Other commercial construction		84,604		9		9		96,482		62		51
Residential		131,114		1,269		765		98,885		1,183		630
Residential Alt-A		167,780		1,836		593		192,609		1,872		494
Consumer:
Home equity lines and loans		11,949		172		48		11,814		174		26
Automobile		51,138		863		185		56,071		957		262
Other		11,996		121		52		5,579		75		32

Total	$	1,017,603		6,784		4,060		1,148,537		6,727		3,567


	Nine months ended September 30, 2012						Nine months ended September 30, 2011
			Interest income recognized						Interest income recognized
	Average recorded investment		Total		Cash basis		Average recorded investment		Total		Cash basis
	(in thousands)
Commercial, financial, leasing, etc.	$	155,627		2,659		2,659		163,005		2,844		2,820
Real estate:
Commercial		179,524		2,087		2,087		191,818		1,705		1,630
Residential builder and developer		260,858		1,202		801		321,386		1,261		338
Other commercial construction		100,242		5,019		5,019		102,978		759		522
Residential		128,646		3,926		2,453		92,918		3,209		1,770
Residential Alt-A		174,390		5,432		1,666		199,066		5,858		1,455
Consumer:
Home equity lines and loans		11,024		502		136		11,989		523		74
Automobile		52,249		2,632		553		57,704		2,925		850
Other		10,097		320		138		4,124		187		51

Total	$	1,072,657		23,779		15,512		1,144,988		19,271		9,510

In accordance with the previously described policies, the Company utilizes a loan grading system that is applied to all commercial loans and commercial real estate loans. Loan grades are utilized to differentiate risk within the portfolio and consider the expectations of default for each loan. Commercial loans and commercial real estate loans with a lower expectation of default are assigned one of ten possible “pass” loan grades and are generally ascribed lower loss factors when determining the allowance for credit losses. Loans with an elevated level of credit risk are classified as “criticized” and are ascribed a higher loss factor when determining the allowance for credit losses. Criticized loans may be classified as “nonaccrual” if the Company no longer expects to collect all amounts according to the contractual terms of the loan agreement or the loan is delinquent 90 days or more. All larger balance criticized commercial and commercial real estate loans are individually reviewed by centralized loan review personnel each quarter to determine the appropriateness of the assigned loan grade, including whether the loan should be reported as accruing or nonaccruing. Smaller balance criticized loans are analyzed by business line risk management areas to ensure proper loan grade classification. Furthermore, criticized nonaccrual commercial loans and commercial real estate loans are considered impaired and, as a result, specific loss allowances on such loans are established within the allowance for credit losses to the extent appropriate in each individual instance. The following table summarizes the loan grades applied to the various classes of the Company’s commercial and commercial real estate loans as of September 30, 2012 and December 31, 2011.


			Real Estate
	Commercial, Financial, Leasing, etc.		Commercial		Residential Builder and Developer		Other Commercial Construction
	(in thousands)
September 30, 2012
Pass	$	15,823,813		20,373,273		976,233		1,966,097
Criticized accrual		758,956		914,702		104,590		211,037
Criticized nonaccrual		121,806		172,246		225,529		26,709

Total	$	16,704,575		21,460,221		1,306,352		2,203,843

December 31, 2011
Pass	$	14,869,636		19,089,252		1,085,970		2,254,609
Criticized accrual		701,202		999,085		140,787		282,399
Criticized nonaccrual		163,598		171,111		281,576		106,325

Total	$	15,734,436		20,259,448		1,508,333		2,643,333

In determining the allowance for credit losses, residential real estate loans and consumer loans are generally evaluated collectively after considering such factors as payment performance, recent loss experience and trends, which are mainly driven by current collateral values in the market place as well as the amount of loan defaults. Loss rates on such loans are determined by reference to recent charge-off history and are evaluated (and adjusted if deemed appropriate) through consideration of other factors including near-term forecasted loss estimates developed by M&T’s Credit Department. In arriving at such forecasts, M&T considers the current estimated fair value of its collateral based on geographical adjustments for home price depreciation/appreciation and overall borrower repayment performance. With regard to collateral values, the realizability of such values by the Company contemplates repayment of any first lien position prior to recovering amounts on a second lien position. 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. The determination of the allocated portion of the allowance for credit losses is very subjective. Given that inherent subjectivity and potential imprecision involved in determining the allocated portion of the allowance for credit losses, the Company also provides an inherent unallocated portion of the allowance. The unallocated portion of the allowance 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. Therefore, the level of the unallocated portion of the allowance is primarily reflective of the inherent imprecision in the various calculations used in determining the allocated portion of the allowance for credit losses. Other factors that could also lead to changes in the unallocated portion include the effects of expansion into new markets for which the Company does not have the same degree of familiarity and experience regarding portfolio performance in changing market conditions, the introduction of new loan and lease product types, and other risks associated with the Company’s loan portfolio that may not be specifically identifiable.

At September 30, 2012 and December 31, 2011, 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)
September 30, 2012
Individually evaluated for impairment	$	29,738		59,794		23,953		22,453	$	135,938
Collectively evaluated for impairment		207,556		283,547		66,724		148,479		706,306
Purchased impaired		173		1,510		3,291		386		5,360

Allocated	$	237,467		344,851		93,968		171,318		847,604

Unallocated										73,619

Total									$	921,223

December 31, 2011
Individually evaluated for impairment	$	48,517		71,784		29,420		15,858	$	165,579
Collectively evaluated for impairment		185,048		291,271		60,742		126,613		663,674
Purchased impaired		457		4,582		1,753		650		7,442

Allocated	$	234,022		367,637		91,915		143,121		836,695

Unallocated										71,595

Total									$	908,290

The recorded investment in loans and leases summarized on the basis of the Company’s impairment methodology as of September 30, 2012 and December 31, 2011 was as follows:


	Commercial, Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(in thousands)
September 30, 2012
Individually evaluated for impairment	$	129,916		488,493		290,023		76,676	$	985,108
Collectively evaluated for impairment		16,557,225		24,016,884		10,476,900		11,547,837		62,598,846
Purchased impaired		17,434		465,039		41,297		4,231		528,001

Total	$	16,704,575		24,970,416		10,808,220		11,628,744	$	64,111,955

December 31, 2011
Individually evaluated for impairment	$	171,442		561,615		306,320		71,496	$	1,110,873
Collectively evaluated for impairment		15,539,232		23,281,585		7,560,104		11,950,849		58,331,770
Purchased impaired		23,762		567,914		56,741		4,945		653,362

Total	$	15,734,436		24,411,114		7,923,165		12,027,290	$	60,096,005

During the normal course of business, the Company modifies loans to maximize recovery efforts. If the borrower is experiencing financial difficulty and a concession is granted, the Company considers such modifications as troubled debt restructurings and classifies those loans as either nonaccrual loans or renegotiated loans. The types of concessions that the Company grants typically include principal deferrals and interest rate concessions, but may also include other types of concessions.

The tables below summarize the Company’s loan modification activities that were considered troubled debt restructurings for the three months ended September 30, 2012 and 2011:


			Recorded investment				Financial effects of modification
Three months ended September 30, 2012	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
			(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		21	$	7,823	$	7,653	$	(170	)	$	—
Combination of concession types		2		327		322		(5	)		(39	)
Real estate:
Commercial
Principal deferral		8		5,951		6,238		287			—
Combination of concession types		1		214		214		—			(49	)
Residential builder and developer
Principal deferral		11		17,383		16,275		(1,108	)		—
Combination of concession types		1		2,486		2,486		—			—
Other commercial construction
Principal deferral		2		5,429		4,702		(727	)		—
Residential
Principal deferral		5		738		772		34			—
Combination of concession types		18		5,490		5,553		63			(150	)
Residential Alt-A
Principal deferral		1		218		220		2			—
Combination of concession types		13		2,771		2,795		24			—
Consumer:
Home equity lines and loans
Principal deferral		5		434		434		—			—
Combination of concession types		11		976		976		—			(125	)
Automobile
Principal deferral		135		1,721		1,721		—			—
Interest rate reduction		9		157		157		—			(11	)
Other		20		68		68		—			—
Combination of concession types		109		2,329		2,329		—			(319	)
Other
Principal deferral		14		336		336		—			—
Other		1		1		1		—			—
Combination of concession types		22		339		339		—			(97	)

Total		409	$	55,191	$	53,591	$	(1,600	)	$	(790	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.


			Recorded investment				Financial effects of modification
Three months ended September 30, 2011	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
			(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		13	$	1,021	$	1,115	$	94		$	—
Real estate:
Commercial
Principal deferral		6		1,361		1,301		(60	)		—
Residential builder and developer
Other		1		1,700		1,350		(350	)		—
Other commercial construction
Principal deferral		2		6,161		6,284		123			—
Residential
Principal deferral		12		2,099		2,124		25			—
Interest rate reduction		1		86		86		—			(7	)
Combination of concession types		22		2,972		3,044		72			(51	)
Residential Alt-A
Principal deferral		1		532		562		30			—
Combination of concession types		8		1,393		1,446		53			(341	)
Consumer:
Home equity lines and loans
Principal deferral		1		50		50		—			—
Other		1		43		43		—			—
Combination of concession types		9		696		697		1			(157	)
Automobile
Principal deferral		159		1,655		1,655		—			—
Interest rate reduction		6		52		52		—			(4	)
Other		26		279		279		—			—
Combination of concession types		96		1,049		1,049		—			(57	)
Other
Principal deferral		7		186		186		—			—
Interest rate reduction		1		9		9		—			(1	)
Other		1		81		81		—			—
Combination of concession types		31		263		263		—			(63	)

Total		404	$	21,688	$	21,676	$	(12	)	$	(681	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.

The tables below summarize the Company’s loan modification activities that were considered troubled debt restructurings for the nine months ended September 30, 2012 and 2011:


			Recorded investment				Financial effects of modification
Nine months ended September 30, 2012	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
	(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		39	$	21,027	$	19,668	$	(1,359	)	$	—
Other		3		2,967		3,052		85			—
Combination of concession types		3		372		366		(6	)		(72	)
Real estate:
Commercial
Principal deferral		11		10,387		10,642		255			—
Interest rate reduction		1		383		430		47			(89	)
Combination of concession types		5		1,424		1,445		21			(305	)
Residential builder and developer
Principal deferral		19		26,708		24,812		(1,896	)		—
Combination of concession types		3		4,836		5,212		376			—
Other commercial construction
Principal deferral		5		66,317		65,600		(717	)		—
Residential
Principal deferral		27		3,302		3,447		145			—
Combination of concession types		47		10,475		10,658		183			(415	)
Residential Alt-A
Principal deferral		5		768		785		17			—
Combination of concession types		28		5,640		5,732		92			(49	)
Consumer:
Home equity lines and loans
Principal deferral		15		1,285		1,285		—			—
Interest rate reduction		1		144		144		—			(6	)
Combination of concession types		17		1,691		1,691		—			(272	)
Automobile
Principal deferral		484		6,306		6,306		—			—
Interest rate reduction		16		234		234		—			(16	)
Other		51		239		239		—			—
Combination of concession types		298		5,108		5,108		—			(601	)
Other
Principal deferral		73		1,117		1,117		—			—
Interest rate reduction		3		23		23		—			(3	)
Other		10		50		50		—			—
Combination of concession types		74		700		700		—			(155	)

Total		1,238	$	171,503	$	168,746	$	(2,757	)	$	(1,983	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.


			Recorded investment				Financial effects of modification
Nine months ended September 30, 2011	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
	(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		46	$	8,302	$	8,396	$	94		$	—
Combination of concession types		1		1,945		1,945		—			(641	)
Real estate:
Commercial
Principal deferral		24		13,212		13,041		(171	)		—
Residential builder and developer
Principal deferral		4		18,586		17,661		(925	)		—
Other		6		118,114		110,156		(7,958	)		—
Combination of concession types		1		798		790		(8	)		—
Other commercial construction
Principal deferral		3		8,436		8,553		117			—
Residential
Principal deferral		24		2,869		2,884		15			—
Interest rate reduction		12		1,764		1,804		40			(70	)
Combination of concession types		81		16,066		16,385		319			(864	)
Residential Alt-A
Principal deferral		2		605		638		33			—
Combination of concession types		23		4,255		4,362		107			(572	)
Consumer:
Home equity lines and loans
Principal deferral		2		119		119		—			—
Other		1		43		43		—			—
Combination of concession types		19		1,484		1,486		2			(272	)
Automobile
Principal deferral		580		7,993		7,993		—			—
Interest rate reduction		17		183		183		—			(12	)
Other		83		537		537		—			—
Combination of concession types		318		5,049		5,049		—			(556	)
Other
Principal deferral		20		348		348		—			—
Interest rate reduction		1		9		9		—			(1	)
Other		2		92		92		—			—
Combination of concession types		77		482		482		—			(75	)

Total		1,347	$	211,291	$	202,956	$	(8,335	)	$	(3,063	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.

Troubled debt restructurings are considered to be impaired loans and for purposes of establishing the allowance for credit losses 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. Impairment of troubled debt restructurings that have subsequently defaulted may also be measured based on the loan’s observable market price or the fair value of collateral if the loan is collateral-dependent. Loans that were modified as troubled debt restructurings during the twelve months ended September 30, 2012 and 2011 for which there was a subsequent payment default during the three- and nine-month periods ended September 30, 2012 and 2011, respectively, were not material.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5162-111524

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 9

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

+ Details

Borrowings

9 Months Ended

Sep. 30, 2012

Borrowings

5. Borrowings

M&T had $1.2 billion of fixed and floating rate junior subordinated deferrable interest debentures (“Junior Subordinated Debentures”) outstanding at September 30, 2012 which are held by various trusts that 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. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 was signed into law on July 21, 2010 and provides 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.

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.

Including the unamortized portions of acquisition accounting adjustments to reflect estimated fair value at the acquisition dates of the Common Securities of various trusts, the Junior Subordinated Debentures associated with Capital Securities had financial statement carrying values of $1.2 billion at each of September 30, 2012 and December 31, 2011.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Shareholders' equity

9 Months Ended

Sep. 30, 2012

Shareholders' equity

6. 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 issued and outstanding		Carrying value September 30, 2012		Carrying value December 31, 2011
			(dollars in thousands)
Series A (a)(b)
Fixed Rate Cumulative Perpetual		230,000	$	226,232	$	224,277
Preferred Stock, Series A, $1,000 liquidation preference per share

Series C (a)(c)
Fixed Rate Cumulative Perpetual		151,500		144,184		140,308
Preferred Stock, Series C, $1,000 liquidation preference per share

Series D (d)
Fixed Rate Non-Cumulative
Perpetual Preferred Stock, Series D, $10,000 liquidation preference per share		50,000		500,000		500,000

(a)

Shares were issued as part of the TARP of the 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 were scheduled to increase to 9% per year. In August 2012, the U.S. Treasury sold its holdings of M&T’s Series A and Series C preferred stock to the public, which allowed M&T to exit the TARP. Certain modifications were made to the terms of the Series A and Series C preferred stock, which remain subject to M&T common shareholder approval. Such modifications included a change in the dividend rate on November 15, 2013 to 6.375% (rather than the original 9% noted above) and a provision that M&T will not redeem the preferred shares until on or after November 15, 2018.

(b)

On May 18, 2011, M&T redeemed and retired 370,000 shares of Series A Preferred Stock. Accelerated amortization of preferred stock discount associated with the redemption was $11.2 million.

(c)

Shares were assumed in an acquisition and a new Series C Preferred Stock was designated.

(d)

Shares were issued on May 31, 2011. Dividends, if declared, will be paid semi-annually at a rate of 6.875% per year. The shares are redeemable in whole or in part on or after June 15, 2016. Notwithstanding M&T’s option to redeem the shares, if an event occurs such that the shares no longer qualify as Tier 1 capital, M&T may redeem all of the shares within 90 days following that occurrence.

In addition to the Series A and Series C warrants mentioned in (a) above, a ten-year warrant to purchase 95,383 shares of M&T common stock at $518.96 per share was outstanding at September 30, 2012 and December 31, 2011. That warrant was issued by Wilmington Trust in December 2008 as part of the TARP of the U.S. Treasury along with $330 million of fixed rate cumulative perpetual preferred stock, which was redeemed by M&T immediately prior to the May 16, 2011 acquisition of Wilmington Trust.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Pension plans and other postretirement benefits

9 Months Ended

Sep. 30, 2012

Pension plans and other postretirement benefits

7. Pension plans and other postretirement benefits

The Company provides defined benefit pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic defined benefit cost for defined benefit plans consisted of the following:


	Pension benefits						Other postretirement benefits
	Three months ended September 30
	2012			2011			2012		2011
				(in thousands)
Service cost	$	7,387			8,557			167		148
Interest cost on projected benefit obligation		15,509			16,155			934		1,038
Expected return on plan assets		(17,627	)		(16,718	)		—		—
Amortization of prior service cost		(1,640	)		(1,640	)		5		27
Amortization of net actuarial loss		9,291			5,132			133		9

Net periodic benefit cost	$	12,920			11,486			1,239		1,222


	Pension benefits						Other postretirement benefits
	Nine months ended September 30
	2012			2011			2012		2011
				(in thousands)
Service cost	$	22,162			20,270			501		388
Interest cost on projected benefit obligation		46,527			42,391			2,803		2,722
Expected return on plan assets		(52,883	)		(43,981	)		—		—
Amortization of prior service cost		(4,919	)		(4,919	)		15		81
Amortization of net actuarial loss		27,874			15,397			398		27

Net periodic benefit cost	$	38,761			29,158			3,717		3,218

Expense incurred in connection with the Company’s defined contribution pension and retirement savings plans totaled $11,289,000 and $10,455,000 for the three months ended September 30, 2012 and 2011, respectively, and $37,304,000 and $30,521,000 for the nine months ended September 30, 2012 and 2011, respectively. The Company is not required to make any minimum contributions to the qualified defined benefit plans in 2012, however, during the third quarter of 2012 the Company elected to contribute $200 million to the plans.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per common share

9 Months Ended

Sep. 30, 2012

Earnings per common share

8. Earnings per common share

The computations of basic earnings per common share follow:


	Three months ended						Nine months ended
	September 30						September 30
	2012			2011			2012			2011
	(in thousands, except per share)
Income available to common shareholders:

Net income	$	293,462			183,108		$	733,305			711,739
Less: Preferred stock dividends (a)		(13,363	)		(14,079	)		(40,088	)		(31,761	)
Amortization of preferred stock discount (a)		(2,033	)		(1,848	)		(5,921	)		(18,132	)

Net income available to common equity		278,066			167,181			687,296			661,846

Less: Income attributable to unvested stock-based compensation awards		(4,181	)		(2,513	)		(10,475	)		(9,905	)

Net income available to common shareholders	$	273,885			164,668			676,821			651,941

Weighted-average shares outstanding:

Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		127,741			126,478			127,449			123,855
Less: Unvested stock-based compensation awards		(1,922	)		(1,903	)		(1,939	)		(1,850	)

Weighted-average shares outstanding		125,819			124,575			125,510			122,005

Basic earnings per common share	$	2.18			1.32		$	5.39			5.34

(a)

Including impact of not as yet declared cumulative dividends.

The computations of diluted earnings per common share follow:


	Three months ended						Nine months ended
	September 30						September 30
	2012			2011			2012			2011
	(in thousands, except per share)
Net income available to common equity	$	278,066			167,181		$	687,296			661,846

Less: Income attributable to unvested stock-based compensation awards		(4,170	)		(2,510	)		(10,454	)		(9,880	)
Net income available to common shareholders	$	273,896			164,671			676,842			651,966


Adjusted weighted-average shares outstanding:

Common and unvested stock-based compensation awards		127,741			126,478			127,449			123,855
Less: Unvested stock-based compensation awards		(1,923	)		(1,903	)		(1,939	)		(1,850	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and convertible preferred stock		474			285			426			516

Adjusted weighted-average shares outstanding		126,292			124,860			125,936			122,521

Diluted earnings per common share	$	2.17			1.32		$	5.37			5.32

GAAP defines unvested share-based awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) as participating securities that shall be included in the computation of earnings per common share pursuant to the two-class method. The Company has issued stock-based compensation awards in the form of restricted stock and restricted stock units, which, in accordance with GAAP, are considered participating securities.

Stock-based compensation awards, warrants to purchase common stock of M&T and preferred stock convertible into shares of M&T stock representing approximately 9.7 million and 11.2 million common shares during the three-month periods ended September 30, 2012 and 2011, respectively, and 9.9 million and 10.6 million common shares during the nine-month periods ended September 30, 2012 and 2011, respectively, were not included in the computations of diluted earnings per common share because the effect on those periods would have been antidilutive.

Comprehensive income

9 Months Ended

Sep. 30, 2012

Comprehensive income

9. Comprehensive income

The following table displays the components of other comprehensive income (loss):


	Before-tax amount			Income taxes			Net
	(in thousands)
For the nine months ended September 30, 2012
Unrealized gains (losses) on investment securities:
Available-for-sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):
Unrealized holding losses, net	$	(5,251	)	$	2,061		$	(3,190	)
Less: OTTI charges recognized in net income		(27,976	)		10,980			(16,996	)

Net change for AFS investment securities with OTTI		22,725			(8,919	)		13,806
AFS investment securities – all other:
Unrealized holding gains, net		153,908			(60,362	)		93,546
Less: reclassification adjustment for gains realized in net income		9			(4	)		5

Net change for AFS investment securities – all other		153,899			(60,358	)		93,541
Held-to-maturity (“HTM”) investment securities with OTTI:
Unrealized holding losses, net		(2,848	)		1,118			(1,730	)
Less: reclassification to income of unrealized holding losses		(1,544	)		606			(938	)
Less: OTTI charges recognized in net income		(5,355	)		2,102			(3,253	)

Net change for HTM investment securities with OTTI		4,051			(1,590	)		2,461

Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		3,495			(1,372	)		2,123

Net unrealized gains on investment securities		184,170			(72,239	)		111,931

Reclassification to income for amortization of gains on terminated cash flow hedges		(178	)		66			(112	)
Foreign currency translation adjustment		552			(201	)		351
Defined benefit plans liability adjustment		23,368			(9,172	)		14,196

	$	207,912		$	(81,546	)	$	126,366

For the nine months ended September 30, 2011
Unrealized gains (losses) on investment securities:
AFS investment securities with OTTI:
Unrealized holding losses, net	$	(35,305	)	$	13,952		$	(21,353	)
Less: reclassification adjustment for gains realized in net income		3,814			(1,497	)		2,317
Less: OTTI charges recognized in net income		(41,713	)		16,372			(25,341	)

Net change for AFS investment securities with OTTI		2,594			(923	)		1,671
AFS investment securities — all other:
Unrealized holding gains, net		147,338			(57,629	)		89,709
Less: reclassification adjustment for gains realized in net income		146,115			(57,257	)		88,858

Net change for AFS investment securities – all other		1,223			(372	)		851
HTM investment securities with OTTI:
Unrealized holding losses, net		(8,500	)		3,336			(5,164	)
Less: reclassification to income of unrealized holding losses		(213	)		83			(130	)
Less: OTTI charges recognized in net income		(10,500	)		4,121			(6,379	)

Net change for HTM investment securities with OTTI		2,213			(868	)		1,345

Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		5,108			(2,005	)		3,103

Net unrealized gains on investment securities		11,138			(4,168	)		6,970

Reclassification to income for amortization of gains on terminated cash flow hedges		(336	)		125			(211	)
Foreign currency translation adjustment		(779	)		276			(503	)
Defined benefit plans liability adjustment		10,586			(4,155	)		6,431

	$	20,609		$	(7,922	)	$	12,687

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


									Foreign
						Cash			currency			Defined
	Investment securities					flow			translation			benefit
	With OTTI			All other		hedges			adjustment			plans			Total
	(in thousands)
Balance – January 1, 2012	$	(84,029	)		5,995		112			(803	)		(277,716	)		(356,441	)
Net gain (loss) during period		16,267			95,664		(112	)		351			14,196			126,366

Balance – September 30, 2012	$	(67,762	)		101,659		—			(452	)		(263,520	)		(230,075	)

Balance – January 1, 2011	$	(87,053	)		2,332		393			—			(120,892	)		(205,220	)
Net gain (loss) during period		3,016			3,954		(211	)		(503	)		6,431			12,687

Balance – September 30, 2011	$	(84,037	)		6,286		182			(503	)		(114,461	)		(192,533	)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e716-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14-26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative financial instruments

9 Months Ended

Sep. 30, 2012

Derivative financial instruments

10. 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 September 30, 2012.

The net effect of interest rate swap agreements was to increase net interest income by $9 million for each of the three-month periods ended September 30, 2012 and 2011, and $27 million and $28 million for the nine months ended September 30, 2012 and 2011, respectively. 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:


					Weighted-
	Notional		Average		average rate .
	amount		maturity		Fixed			Variable
	(in thousands)		(in years)
September 30, 2012
Fair value hedges:
Fixed rate long-term borrowings (a)	$	900,000		4.6		6.07	%		1.96	%

December 31, 2011
Fair value hedges:
Fixed rate long-term borrowings (a)	$	900,000		5.4		6.07	%		2.07	%

(a)

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

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 $15.1 billion and $13.9 billion at September 30, 2012 and December 31, 2011, respectively. The notional amounts of foreign currency and other option and futures contracts entered into for trading purposes aggregated $1.2 billion and $1.4 billion at September 30, 2012 and December 31, 2011, 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
	September 30, 2012		December 31, 2011		September 30, 2012		December 31, 2011
	(in thousands)
Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements (a)	$	153,220		147,302	$	—		—
Commitments to sell real estate loans (a)		127		232		16,804		2,287

		153,347		147,534		16,804		2,287
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale (a)		70,430		7,991		85		1,068
Commitments to sell real estate loans (a)		2,777		1,328		22,909		2,771
Trading:
Interest rate contracts (b)		441,467		443,033		410,929		415,836
Foreign exchange and other option and futures contracts (b)		13,462		19,115		13,383		18,723

		528,136		471,467		447,306		438,398

Total derivatives	$	681,483		619,001	$	464,110		440,685

(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
	Three months ended September 30, 2012					Three months ended September 30, 2011
	Derivative		Hedged item			Derivative		Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	3,273		(3,252	)	$	42,587		(40,355	)

Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	777				$	2,425
Foreign exchange and other option and futures contracts (b)		74					1,764

Total	$	851				$	4,189


	Amount of unrealized gain (loss) recognized
	Nine months ended September 30, 2012						Nine months ended September 30, 2011
	Derivative			Hedged item			Derivative		Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	5,918			(5,876	)	$	52,127		(49,452	)

Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	3,996					$	3,901
Foreign exchange and other option and futures contracts (b)		(3,071	)					473

Total	$	925					$	4,374

(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 that 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 $81 million and $12 million at September 30, 2012 and December 31, 2011, 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 September 30, 2012 for which the Company was required to post collateral was $330 million. The fair value of collateral posted for such instruments was $306 million. Certain of the Company’s derivative financial instruments contain provisions that require the Company to maintain specific credit ratings from credit rating agencies to avoid higher collateral posting requirements. If the Company’s debt rating were to fall below specified ratings, the counterparties to the derivative financial instruments could demand immediate incremental collateralization on those instruments in a net liability position. The aggregate fair value of all derivative financial instruments with such credit-risk-related contingent features in a net liability position on September 30, 2012 was $95 million, for which the Company had posted collateral of $71 million in the normal course of business. If the credit-risk-related contingent features had been triggered on September 30, 2012, the maximum amount of additional collateral the Company would have been required to post to counterparties was $24 million.

The Company’s credit exposure with respect to the estimated fair value as of September 30, 2012 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 $77 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.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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+ Details

Variable interest entities and asset securitizations

9 Months Ended

Sep. 30, 2012

Variable interest entities and asset securitizations

11. Variable interest entities and asset securitizations

In accordance with GAAP, the Company determined that it was the primary beneficiary of a residential mortgage loan securitization trust considering its role as servicer and its retained subordinated interests in the trust. As a result, the Company has included the one-to-four family residential mortgage loans that were included in the trust in its consolidated financial statements. At September 30, 2012 and December 31, 2011, the carrying values of the loans in the securitization trust were $162 million and $196 million, respectively. The outstanding principal amount of mortgage-backed securities issued by the qualified special purpose trust that was held by parties unrelated to M&T at September 30, 2012 and December 31, 2011 was $24 million and $30 million, respectively. Because the transaction was non-recourse, the Company’s maximum exposure to loss as a result of its association with the trust at September 30, 2012 is limited to realizing the carrying value of the loans less the amount of the mortgage-backed securities held by third parties.

As described in note 5, 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 September 30, 2012 and December 31, 2011, 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 5.

The Company has invested as a limited partner in various real estate partnerships that collectively had total assets of approximately $1.4 billion at each of September 30, 2012 and December 31, 2011, 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 $260 million, including $66 million of unfunded commitments, at September 30, 2012 and $271 million, including $75 million of unfunded commitments, at December 31, 2011. 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

9 Months Ended

Sep. 30, 2012

Fair value measurements

12. 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 September 30, 2012.

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.

The markets for privately issued mortgage-backed securities have experienced a sharp reduction of non-agency mortgage-backed securities issuances, a reduction in trading volumes and wide bid-ask spreads. 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.

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 September 30, 2012 and December 31, 2011. 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 $1.2 billion at September 30, 2012 and $1.3 billion at December 31, 2011. 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, collateral valuation and loss rates. 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 averaged the internal model valuations and the indications obtained from the two independent pricing sources, such that at September 30, 2012, the weighted-average reliance on internal model pricing for the bonds modeled was 33% with a 67% average weighting placed on the values provided by the independent sources. Significant unobservable inputs used in the Company’s modeling of fair value for residential mortgage-backed securities are included in the accompanying table of significant unobservable inputs to Level 3 measurements. The Company concluded its estimate of fair value for the $1.2 billion of privately issued residential mortgage-backed securities to approximate $1.0 billion, which reflects a market yield based on reasonably likely cash flows of 6.5%. The Company determined the fair value of its privately issued commercial mortgage-backed securities held in its available-for-sale portfolio using quoted market prices obtained from third party pricing services without adjustment. Similar to privately-issued residential mortgage-backed securities, the market for commercial mortgage-backed securities has experienced significant declines in the level of market activity, resulting in the classification of such bonds as Level 3.

Included in collateralized debt obligations are securities backed by trust preferred securities issued by financial institutions and other entities. 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 September 30, 2012 and December 31, 2011. The modeling techniques included estimating cash flows using bond-specific assumptions about 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. In determining a market yield applicable to the estimated cash flows, a margin over LIBOR, ranging from 4% to 10% with a weighted-average of 8% was used. Significant unobservable inputs used in the determination of estimated fair value of collateralized debt obligations are included in the accompanying table of significant unobservable inputs to Level 3 measurements. At September 30, 2012, the total amortized cost and fair value of securities backed by trust preferred securities issued by financial institutions and other entities were $43 million and $57 million, respectively, and at December 31, 2011 were $44 million and $53 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 September 30, 2012 and December 31, 2011.

The Company ensures an appropriate control framework is in place over the valuation processes and techniques used for Level 3 fair value measurements. Specifically, the Company attempts to obtain the market observable inputs used by third party pricing sources on a sample of bonds each quarter. Analytical procedures are performed to understand changes in fair value from period to period. Internal pricing models are subject to validation procedures including testing of mathematical constructs, review of valuation methodology and significant assumptions used.

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. The estimated commitment expirations are considered significant unobservable inputs contributing to the Level 3 classification of commitments to originate real estate loans for sale. Significant unobservable inputs used in the determination of estimated fair value of commitments to originate real estate loans for sale are included in the accompanying table of significant unobservable inputs to Level 3 measurements.

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 September 30, 2012 and December 31, 2011 measured at estimated fair value on a recurring basis:


	Fair value measurements at September 30, 2012		Level 1 (a)		Level 2 (a)		Level 3
	(in thousands)
Trading account assets	$	526,844		55,391		471,453		—
Investment securities available for sale:
U.S. Treasury and federal agencies		56,345		—		56,345		—
Obligations of states and political subdivisions		33,980		—		33,980		—
Mortgage-backed securities:
Government issued or guaranteed		3,748,252		—		3,748,252		—
Privately issued residential		1,055,068		—		—		1,055,068
Privately issued commercial		10,568		—		—		10,568
Collateralized debt obligations		57,201		—		—		57,201
Other debt securities		109,405		—		109,405		—
Equity securities		113,059		106,789		6,270		—

		5,183,878		106,789		3,954,252		1,122,837

Real estate loans held for sale		976,083		—		976,083		—
Other assets (b)		226,554		—		156,124		70,430

Total assets	$	6,913,359		162,180		5,557,912		1,193,267

Trading account liabilities	$	424,312		—		424,312		—
Other liabilities (b)		39,798		—		39,713		85

1Total liabilities	$	464,110		—		464,025		85


	Fair value measurements at December 31, 2011		Level 1 (a)		Level 2 (a)		Level 3
	(in thousands)
Trading account assets	$	561,834		53,165		508,669		—
Investment securities available for sale:
U.S. Treasury and federal agencies		70,723		—		70,723		—
Obligations of states and political subdivisions		40,269		—		40,269		—
Mortgage-backed securities:
Government issued or guaranteed		4,521,233		—		4,521,233		—
Privately issued residential		1,136,256		—		—		1,136,256
Privately issued commercial		15,029		—		—		15,029
Collateralized debt obligations		52,500		—		—		52,500
Other debt securities		176,845		—		176,845		—
Equity securities		215,705		205,587		10,118		—

		6,228,560		205,587		4,819,188		1,203,785

Real estate loans held for sale		371,437		—		371,437		—
Other assets (b)		156,853		—		148,862		7,991

Total assets	$	7,318,684		258,752		5,848,156		1,211,776

Trading account liabilities	$	434,559		—		434,559		—
Other liabilities (b)		6,126		—		5,058		1,068

Total liabilities	$	440,685		—		439,617		1,068

(a)

There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the three months and nine months ended September 30, 2012 and 2011.

(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 three months ended September 30, 2012 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – June 30, 2012	$	1,068,392		$	12,127		$	55,098		$	34,051

Total gains (losses) realized/unrealized:
Included in earnings		(5,672	)(a)		—			—			84,864	(b)
Included in other comprehensive income		39,963	(e)		640	(e)		3,297	(e)		—
Settlements		(47,615	)		(2,199	)		(1,194	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(48,570	)(d)

Balance – September 30, 2012	$	1,055,068		$	10,568		$	57,201		$	70,345

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2012	$	(5,672	)(a)	$	—		$	—		$	63,357	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three months ended September 30, 2011 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – June 30, 2011	$	1,306,202		$	17,233		$	61,601		$	13,171

Total gains (losses) realized/unrealized:
Included in earnings		(9,642	)(a)		—			—			13,565	(b)
Included in other comprehensive income		(4,030	)(e)		1,581	(e)		(9,482	)(e)		—
Settlements		(77,452	)		(1,985	)		(765	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(18,799	)(d)

Balance – September 30, 2011	$	1,215,078		$	16,829		$	51,354		$	7,937

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2011	$	(9,642	)(a)	$	—		$	—		$	5,926	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the nine months ended September 30, 2012 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – January 1, 2012	$	1,136,256		$	15,029		$	52,500		$	6,923

Total gains (losses) realized/unrealized:
Included in earnings		(27,976	)(a)		—			—			157,381	(b)
Included in other comprehensive income		87,646	(e)		1,751	(e)		7,008	(e)		—
Settlements		(140,858	)		(6,212	)		(2,307	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(93,959	)(d)

Balance – September 30, 2012	$	1,055,068		$	10,568		$	57,201		$	70,345

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2012	$	(27,976	)(a)	$	—		$	—		$	70,187	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the nine months ended September 30, 2011 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – January 1, 2011	$	1,435,561		$	22,407		$	110,756		$	2,244

Total gains (losses) realized/unrealized:
Included in earnings		(41,713	)(a)		—			—			56,809	(b)
Included in other comprehensive income		95,526	(e)		99	(e)		(2,276	)(e)		—
Purchases		—			—			50,790			—
Sales		—			—			(105,643	)		—
Settlements		(274,296	)		(5,677	)		(2,273	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(51,116	)(d)

Balance – September 30, 2011	$	1,215,078		$	16,829		$	51,354		$	7,937

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2011	$	(41,713	)(a)	$	—		$	—		$	7,932	(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)

Transfers out of Level 3 consist of interest rate locks transferred to closed loans.

(e)

Reported as net unrealized gains on investment securities in the consolidated statement of comprehensive income.

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.

Investment securities held to maturity

During the nine-month periods ended September 30, 2012 and 2011, other-than-temporary losses of $5 million and $11 million, respectively, were recorded. In accordance with GAAP, the carrying value of such securities was reduced to fair value, with estimated credit losses recognized in earnings and any remaining unrealized loss recognized in accumulated other comprehensive income. The determination of fair value includes use of external and internal valuation sources that, as in the case of privately issued residential mortgage-backed securities, are weighted and averaged when estimating fair value. Due to the presence of significant unobservable inputs that valuation is classified as Level 3. The amortized cost, fair value and impact on the Company’s financial statements of the modeling described herein were not material.

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. Non-real estate collateral supporting commercial loans generally consists of business assets such as receivables, inventory and equipment. Fair value estimations are typically determined by discounting recorded values of those assets to reflect estimated net realizable value considering specific borrower facts and circumstances and the experience of credit personnel in their dealings with similar borrower collateral liquidations. Such discounts were generally in the range of 10% to 85% at September 30, 2012. As these discounts are not readily observable and are considered significant, the valuations have been classified as Level 3. Loans subject to nonrecurring fair value measurement were $320 million at September 30, 2012, ($221 million and $99 million of which were classified as Level 2 and Level 3, respectively) and $506 million at September 30, 2011

($355 million and $151 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 September 30, 2012 were decreases of $17 million and $47 million for the three and nine months ended September 30, 2012, respectively. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on September 30, 2011 were decreases of $38 million and $137 million for the three- and nine-month periods ended September 30, 2011, respectively.

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 $51 million and $53 million at September 30, 2012 and September 30, 2011, respectively. Reflecting further declines in residential real estate and residential development projects subsequent to foreclosure, changes in fair value recognized for those foreclosed assets held by the Company at September 30, 2012 were $1 million and $10 million for the three and nine months ended September 30, 2012, respectively. Changes in fair value recognized for those foreclosed assets held by the Company at September 30, 2011 were $6 million and $17 million for the three and nine months ended September 30, 2011, respectively.

Significant unobservable inputs to level 3 measurements

The following table presents quantitative information about significant unobservable inputs used in the fair value measurements for Level 3 assets and liabilities at September 30, 2012:


	Fair value at September 30, 2012		Valuation technique	Unobservable input/assumptions	Range (weighted- average)
Recurring fair value measurements

Privately issued mortgage–backed securities	$	1,065,636	Discounted cash flow	Probability of default	1%-40% (18%)
				Loss severity	32%-79% (49%)

Colateralized debt obligations		57,201	Discounted cash flow	Probability of default	3%-65% (15%)
				Loss severity	100%

Net other assets (liabilities)(a)		70,345	Discounted cash flow	Commitment expirations	0%-73% (22%)

Total level 3 assets, net of liabilities	$	1,193,182

(a)

Other level 3 assets (liabilities) consist of commitments to originate real estate loans.

Sensitivity of fair value measurements to changes in unobservable inputs

An increase (decrease) in the probability of default and loss severity for mortgage-backed securities and collateralized debt obligations backed by trust preferred securities would generally result in a lower (higher) fair value measurement.

An increase (decrease) in the estimate of expirations for commitments to originate residential mortgage loans would generally result in a lower (higher) fair value measurement. Estimated commitment expirations are derived considering loan type, changes in interest rates and remaining length of time until closing.

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:


	September 30, 2012
	Carrying amount			Estimated fair value			Level 1		Level 2			Level 3
	(in thousands)
Financial assets:
Cash and cash equivalents	$	1,622,928		$	1,622,928		$	1,548,290	$	74,638		$	—
Interest-bearing deposits at banks		411,994			411,994			—		411,994			—
Trading account assets		526,844			526,844			55,391		471,453			—
Investment securities		6,624,004			6,577,450			106,789		5,192,015			1,278,646
Loans and leases:
Commercial loans and leases		16,704,575			16,482,866			—		—			16,482,866
Commercial real estate loans		24,970,416			24,703,443			—		175,518			24,527,925
Residential real estate loans		10,808,220			10,992,318			—		7,727,137			3,265,181
Consumer loans		11,628,744			11,512,448			—		—			11,512,448
Allowance for credit losses		(921,223	)		—			—		—			—

Loans and leases, net		63,190,732			63,691,075			—		7,902,655			55,788,420
Accrued interest receivable		244,021			244,021			—		244,021			—

Financial liabilities:
Noninterest-bearing deposits	$	(22,968,401	)	$	(22,968,401	)	$	—	$	(22,968,401	)	$	—
Savings deposits and NOW accounts		(34,663,695	)		(34,663,695	)		—		(34,663,695	)		—
Time deposits		(4,972,409	)		(4,999,049	)		—		(4,999,049	)		—
Deposits at Cayman Islands office		(1,402,753	)		(1,402,753	)		—		(1,402,753	)		—
Short-term borrowings		(592,154	)		(592,154	)		—		(592,154	)		—
Long-term borrowings		(4,969,536	)		(5,090,619	)		—		(5,090,619	)		—
Accrued interest payable		(78,591	)		(78,591	)		—		(78,591	)		—
Trading account liabilities		(424,312	)		(424,312	)		—		(424,312	)		—

Other financial instruments:
Commitments to originate real estate loans for sale	$	70,345		$	70,345		$	—	$	—		$	70,345
Commitments to sell real estate loans		(36,809	)		(36,809	)		—		(36,809	)		—
Other credit-related commitments		(112,713	)		(112,713	)		—		—			(112,713	)
Interest rate swap agreements used for interest rate risk management		153,220			153,220			—		153,220			—


	December 31, 2011
	Carrying amount			Estimated fair value
	(in thousands)
Financial assets:
Cash and cash equivalents	$	1,452,397		$	1,452,397
Interest-bearing deposits at banks		154,960			154,960
Trading account assets		561,834			561,834
Investment securities		7,673,154			7,608,008
Loans and leases:
Commercial loans and leases		15,734,436			15,507,342
Commercial real estate loans		24,411,114			24,024,585
Residential real estate loans		7,923,165			7,782,935
Consumer loans		12,027,290			11,869,813
Allowance for credit losses		(908,290	)		—

Loans and leases, net		59,187,715			59,184,675
Accrued interest receivable		222,618			222,618

Financial liabilities:
Noninterest-bearing deposits	$	(20,017,883	)	$	(20,017,883	)
Savings deposits and NOW accounts		(32,913,309	)		(32,913,309	)
Time deposits		(6,107,530	)		(6,133,806	)
Deposits at Cayman Islands office		(355,927	)		(355,927	)
Short-term borrowings		(782,082	)		(782,082	)
Long-term borrowings		(6,686,226	)		(6,720,174	)
Accrued interest payable		(67,900	)		(67,900	)
Trading account liabilities		(434,559	)		(434,559	)

Other financial instruments:
Commitments to originate real estate loans for sale	$	6,923		$	6,923
Commitments to sell real estate loans		(3,498	)		(3,498	)
Other credit-related commitments		(109,828	)		(109,828	)
Interest rate swap agreements used for interest rate risk management		147,302			147,302

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, agreements to resell securities, 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, agreements to resell securities, 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.

Other commitments and contingencies

As described in note 13, 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.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Number 107
-Paragraph 15A
-Subparagraph a-d
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 32, 33, 34
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-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
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+ Details

Commitments and contingencies

9 Months Ended

Sep. 30, 2012

Commitments and contingencies

13. 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.


	September 30,		December 31,
	2012		2011
	(in thousands)
Commitments to extend credit
Home equity lines of credit	$	6,319,441		6,393,332
Commercial real estate loans to be sold		282,162		177,982
Other commercial real estate and construction		3,578,153		2,818,071
Residential real estate loans to be sold		1,645,005		182,474
Other residential real estate		475,989		129,466
Commercial and other		10,315,662		10,442,754
Standby letters of credit		3,920,218		3,930,271
Commercial letters of credit		46,188		44,981
Financial guarantees and indemnification contracts		1,994,704		1,903,254
Commitments to sell real estate loans		2,337,536		635,899

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 a 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 Delegated Underwriting and Servicing program. The Company’s maximum credit risk for recourse associated with loans sold under this program totaled approximately $1.9 billion and $1.8 billion at September 30, 2012 and December 31, 2011, 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 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 also has commitments under long-term operating leases.

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 $68 million at September 30, 2012. Assets of subsidiaries providing reinsurance that are available to satisfy claims totaled approximately $41 million at September 30, 2012. 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 September 30, 2012, 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 or threatened against M&T or its subsidiaries will be material to the Company’s consolidated financial position. On an on-going basis the Company assesses its liabilities and contingencies in connection with such legal proceedings. For those matters where it is probable that the Company will incur losses and the amounts of the losses can be reasonably estimated, the Company records an expense and corresponding liability in its consolidated financial statements. To the extent the pending or threatened litigation could result in exposure in excess of that liability, the amount of such excess is not currently estimable. Although not considered probable, the range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, was between $0 and $40 million. Although the Company does not believe that the outcome of pending litigations will be material to the Company’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations for a particular reporting period in the future.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment information

9 Months Ended

Sep. 30, 2012

Segment information

14. 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 was compiled utilizing the accounting policies described in note 22 to the Company’s consolidated financial statements as of and for the year ended December 31, 2011. 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, the financial information of the reported segments is not necessarily comparable with similar information reported by other financial institutions. As also described in note 22 to the Company’s 2011 consolidated financial statements, neither goodwill nor core deposit and other intangible assets (and the amortization charges associated with such assets) resulting from acquisitions of financial institutions have been allocated to the Company’s reportable segments, but are included in the “All Other” category. The Company does, however, assign such intangible assets to business units for purposes of testing for impairment.

Information about the Company’s segments is presented in the following table:


	Three months ended September 30
	2012								2011
	Total revenues(a)		Inter- segment revenues			Net income (loss)			Total revenues(a)		Inter- segment revenues			Net income (loss)
	(in thousands)
Business Banking	$	114,181		1,011			38,411			110,627		957			31,237
Commercial Banking		255,498		1,561			112,654			230,023		1,318			93,783
Commercial Real Estate		169,806		5,031			75,896			152,878		410			65,566
Discretionary Portfolio		1,805		(25,593	)		(5,039	)		16,437		(3,968	)		2,077
Residential Mortgage Banking		138,662		28,454			44,727			67,757		25,012			10,805
Retail Banking		318,567		2,841			58,441			314,113		2,583			43,947
All Other		109,936		(13,305	)		(31,628	)		93,266		(26,312	)		(64,307	)

Total	$	1,108,455		—			293,462			985,101		—			183,108


	Nine months ended September 30
	2012									2011
	Total revenues(a)			Inter- segment revenues			Net income (loss)			Total revenues(a)		Inter- segment revenues			Net income (loss)
	(in thousands)
Business Banking	$	335,475			3,202			110,829			314,416		2,890			84,121
Commercial Banking		741,714			4,832			315,373			672,199		3,674			277,225
Commercial Real Estate		491,433			5,860			225,025			412,250		1,214			179,634
Discretionary Portfolio		(11,162	)		(60,990	)		(28,037	)		171,303		(16,174	)		76,566
Residential Mortgage Banking		341,699			100,350			94,238			183,910		44,018			21,556
Retail Banking		939,409			8,931			165,289			920,645		8,537			151,318
All Other		306,632			(62,185	)		(149,412	)		281,460		(44,159	)		(78,681	)

Total	$	3,145,200			—			733,305			2,956,183		—			711,739


	Average total assets
	Nine months ended				Year ended
	September 30				December 31
	2012		2011		2011
			(in millions)
Business Banking	$	4,918		4,995		5,192
Commercial Banking		19,691		17,397		17,650
Commercial Real Estate		16,364		14,730		15,025
Discretionary Portfolio		16,428		13,844		14,170
Residential Mortgage Banking		2,316		1,913		1,958
Retail Banking		11,746		11,904		11,940
All Other		8,055		7,706		8,042

Total	$	79,518		72,489		73,977

(a)

Total revenues are comprised of net interest income and other income. Net interest income is the difference between 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 and allocation 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 $6,534,000 and $6,546,000 for the three-month periods ended September 30, 2012 and 2011, respectively, and $19,884,000 and $19,341,000 for the nine-month periods ended September 30, 2012 and 2011, respectively, and is eliminated in “All Other” total revenues. Intersegment revenues are included in total revenues of the reportable segments. The elimination of intersegment revenues is included in the determination of “All Other” total revenues.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 12
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 35
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 10
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

9 Months Ended

Sep. 30, 2012

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

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

M&T holds a 20% 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 $98 million at September 30, 2012.

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 obtained loan servicing rights for small balance commercial mortgage loans from BLG and Bayview Financial having outstanding principal balances of $4.0 billion and $4.4 billion at September 30, 2012 and December 31, 2011, respectively. Amounts recorded as capitalized servicing assets for such loans totaled $10 million at September 30, 2012 and $16 million at December 31, 2011. In addition, capitalized servicing rights at September 30, 2012 and December 31, 2011 also included $2 million and $5 million, respectively, for servicing rights that were obtained from Bayview Financial related to residential mortgage loans with outstanding principal balances of $2.8 billion at September 30, 2012 and $3.1 billion at December 31, 2011. Revenues from servicing residential and small-balance commercial mortgage loans obtained from BLG and Bayview Financial were $9 million and $10 million for the three months ended September 30, 2012 and 2011, respectively, and $27 million and $31 million for the nine months ended September 30, 2012 and 2011, respectively. The Company sub-services residential mortgage loans for Bayview Financial having outstanding principal balances totaling $11.7 billion at September 30, 2012 and $13.1 billion at December 31, 2011. Revenues earned for sub-servicing loans for Bayview Financial were $2 million and $7 million during the three and nine months ended September 30, 2012, respectively. Revenues earned for sub-servicing residential mortgage loans for Bayview Financial were not significant during the three and nine months ended September 30, 2011. In addition, at September 30, 2012 and December 31, 2011, the Company held $11 million and $15 million, respectively, of collateralized mortgage obligations in its available-for-sale investment securities portfolio that were securitized by Bayview Financial. Finally, the Company held $248 million and $269 million of similar investment securities in its held-to-maturity portfolio at September 30, 2012 and December 31, 2011, respectively.

Significant accounting policies (Policies)

9 Months Ended

Sep. 30, 2012

Consolidation

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 40
-Section 45
-URI http://asc.fasb.org/section&trid=2197723

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196966

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-URI http://asc.fasb.org/subtopic&trid=2197087

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.3A-02)
-URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355033-122828

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33801-111570

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=18733093&loc=d3e5614-111684

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 4
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 5, 6, 16-19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 96-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a(2)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 97-2
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph k
-Article 1

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02, 03
-Article 3A

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 46R
-Paragraph 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Acquisitions (Tables)

9 Months Ended

Sep. 30, 2012

Consideration Paid for Acquired Identifiable Assets and Liabilities

The consideration paid for Wilmington Trust’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the acquisition date were as follows:


	(in thousands)
Purchase price:
Value of:
Common shares issued (4,694,486 shares)	$	405,557
Preferred stock purchased from U.S. Treasury		330,000

Total purchase price		735,557

Identifiable assets:
Cash and due from banks		178,940
Interest-bearing deposits at banks		2,606,265
Other short-term investments		57,817
Investment securities		510,390
Loans and leases		6,410,430
Core deposit and other intangibles		112,094
Other assets		969,106

Total identifiable assets		10,845,042

Liabilities:
Deposits		8,864,161
Short-term borrowings		147,752
Long-term borrowings		600,830
Other liabilities		431,812

Total liabilities		10,044,555

Net gain resulting from acquisition	$	64,930

Pro forma information


	Pro forma Nine months ended
	September 30, 2011
	(in thousands)
Total revenues (a)	$	3,190,437
Net income		663,048

(a)

Represents net interest income plus other income.

Summary of Merger-Related Expenses

A summary of merger-related expenses included in the consolidated statement of income follows:


	Three months ended				Nine months ended
	September 30, 2012		September 30, 2011		September 30, 2012		September 30, 2011
	(in thousands)
Salaries and employee benefits	$	—		285	$	4,997		15,597
Equipment and net occupancy		—		119		15		223
Printing, postage and supplies		—		723		—		1,188
Other costs of operations		—		24,876		4,867		50,286

	$	—		26,003	$	9,879		67,294

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References + Details

Investment securities (Tables)

9 Months Ended

Sep. 30, 2012

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)
September 30, 2012
Investment securities available for sale:
U.S. Treasury and federal agencies	$	55,288		1,057		—	$	56,345
Obligations of states and political subdivisions		33,402		588		10		33,980
Mortgage-backed securities:
Government issued or guaranteed		3,502,237		246,190		175		3,748,252
Privately issued residential		1,198,896		4,929		148,757		1,055,068
Privately issued commercial		10,837		—		269		10,568
Collateralized debt obligations		43,294		15,147		1,240		57,201
Other debt securities		136,418		2,146		29,159		109,405
Equity securities		110,744		9,636		7,321		113,059

		5,091,116		279,693		186,931		5,183,878

Investment securities held to maturity:
Obligations of states and political subdivisions		192,621		8,848		29		201,440
Mortgage-backed securities:
Government issued or guaranteed		669,169		37,259		—		706,428
Privately issued		248,441		334		92,966		155,809
Other debt securities		11,094		—		—		11,094

		1,121,325		46,441		92,995		1,074,771

Other securities		318,801		—		—		318,801

Total	$	6,531,242		326,134		279,926	$	6,577,450

December 31, 2011
Investment securities available for sale:
U.S. Treasury and federal agencies	$	69,468		1,255		—	$	70,723
Obligations of states and political subdivisions		39,518		771		20		40,269
Mortgage-backed securities:
Government issued or guaranteed		4,344,116		177,392		275		4,521,233
Privately issued residential		1,369,371		6,373		239,488		1,136,256
Privately issued commercial		17,679		—		2,650		15,029
Collateralized debt obligations		43,834		11,154		2,488		52,500
Other debt securities		216,700		4,588		44,443		176,845
Equity securities		211,737		8,468		4,500		215,705

		6,312,423		210,001		293,864		6,228,560

Investment securities held to maturity:
Obligations of states and political subdivisions		188,680		9,141		28		197,793
Mortgage-backed securities:
Government issued or guaranteed		608,533		24,881		—		633,414
Privately issued		268,642		—		99,140		169,502
Other debt securities		11,853		—		—		11,853

		1,077,708		34,022		99,168		1,012,562

Other securities		366,886		—		—		366,886

Total	$	7,757,017		244,023		393,032	$	7,608,008

Changes in Credit Losses Associated with Debt Securities for Which Other-Than-Temporary Impairment Losses


	Three months ended September 30
	2012			2011
	(in thousands)
Beginning balance	$	264,197			298,141
Additions for credit losses not previously recognized		5,672			9,642
Reductions for increases in cash flows		—			(90	)
Reductions for realized losses		(67,926	)		(23,127	)

Ending balance	$	201,943			284,566


	Nine months ended September 30
	2012			2011
	(in thousands)
Beginning balance	$	285,399			327,912
Additions for credit losses not previously recognized		33,331			52,213
Reductions for increases in cash flows		—			(5,110	)
Reductions for realized losses		(116,787	)		(90,449	)

Ending balance	$	201,943			284,566

Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity

At September 30, 2012, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:


	Amortized cost		Estimated fair value
	(in thousands)
Debt securities available for sale:
Due in one year or less	$	33,460		33,496
Due after one year through five years		42,405		43,791
Due after five years through ten years		8,611		9,409
Due after ten years		183,926		170,235

		268,402		256,931
Mortgage-backed securities available for sale		4,711,970		4,813,888

	$	4,980,372		5,070,819

Debt securities held to maturity:
Due in one year or less	$	36,459		36,660
Due after one year through five years		45,054		47,410
Due after five years through ten years		110,731		116,979
Due after ten years		11,471		11,485

		203,715		212,534
Mortgage-backed securities held to maturity		917,610		862,237

	$	1,121,325		1,074,771

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)
September 30, 2012
Investment securities available for sale:
Obligations of states and political subdivisions	$	979		(6	)		685		(4	)
Mortgage-backed securities:
Government issued or guaranteed		5,838		(28	)		9,319		(147	)
Privately issued residential		81,620		(454	)		828,916		(148,303	)
Privately issued commercial		—		—			9,744		(269	)
Collateralized debt obligations		3,136		(30	)		5,842		(1,210	)
Other debt securities		—		—			93,266		(29,159	)
Equity securities		5,486		(3,820	)		1,580		(3,501	)

		97,059		(4,338	)		949,352		(182,593	)

Investment securities held to maturity:
Obligations of states and political subdivisions		2,839		(6	)		2,522		(23	)
Privately issued mortgage-backed securities		—		—			155,189		(92,966	)

		2,839		(6	)		157,711		(92,989	)

Total	$	99,898		(4,344	)		1,107,063		(275,582	)

December 31, 2011
Investment securities available for sale:
Obligations of states and political subdivisions	$	—		—			1,228		(20	)
Mortgage-backed securities:
Government issued or guaranteed		38,492		(190	)		6,017		(85	)
Privately issued residential		297,133		(14,188	)		751,077		(225,300	)
Privately issued commercial		—		—			15,029		(2,650	)
Collateralized debt obligations		2,871		(335	)		4,863		(2,153	)
Other debt securities		72,637		(9,883	)		73,635		(34,560	)
Equity securities		9,883		(4,500	)		—		—

		421,016		(29,096	)		851,849		(264,768	)

Investment securities held to maturity:
Obligations of states and political subdivisions		3,084		(4	)		1,430		(24	)
Privately issued mortgage-backed securities		1,883		(592	)		167,139		(98,548	)

		4,967		(596	)		168,569		(98,572	)

Total	$	425,983		(29,692	)		1,020,418		(363,340	)

Loans and leases and the allowance for credit losses (Tables)

9 Months Ended

Sep. 30, 2012

Outstanding Principal Balance and Carrying Amount of Loans that is Included in Consolidated Balance Sheet

The outstanding principal balance and the carrying amount of acquired loans that were recorded at fair value at the acquisition date that is included in the consolidated balance sheet is as follows:


	September 30,		December 31,
	2012		2011
	(in thousands)
Outstanding principal balance	$	7,338,476		9,203,366
Carrying amount:
Commercial, financial, leasing, etc.		977,430		1,331,198
Commercial real estate		2,962,899		3,879,518
Residential real estate		742,977		915,371
Consumer		1,700,161		2,033,700

	$	6,383,467		8,159,787

Summary of Changes in Accretable Yield for Acquired Loans


	Three months ended September 30, 2012
	Purchased			Other
	impaired			acquired			Total
	(in thousands)
Balance at beginning of period	$	55,599			733,161			788,760
Interest income		(12,436	)		(74,936	)		(87,372	)
Reclassifications from (to) nonaccretable balance, net		542			—			542
Other (a)		—			1,382			1,382

Balance at end of period	$	43,705			659,607			703,312


	Nine months ended September 30, 2012
	Purchased			Other
	impaired			acquired			Total
	(in thousands)
Balance at beginning of period	$	30,805			807,960			838,765
Interest income		(29,721	)		(228,908	)		(258,629	)
Reclassifications from (to) nonaccretable balance, net		42,621			98,165			140,786
Other (a)		—			(17,610	)		(17,610	)

Balance at end of period	$	43,705			659,607			703,312

(a)

Other changes in expected cash flows including changes in interest rates and prepayments.

Summary of Current, Past Due and Nonaccrual Loans

A summary of current, past due and nonaccrual loans as of September 30, 2012 and December 31, 2011 were as follows:


			30-89 Days past due		90 Days or more past due and accruing				Purchased impaired (b)		Nonaccrual		Total
	Current		30-89 Days past due		Non- acquired		Acquired (a)		Purchased impaired (b)		Nonaccrual		Total
					(in thousands)
September 30, 2012
Commercial, financial, leasing, etc.	$	16,496,862		50,980		2,574		14,919		17,434		121,806		16,704,575
Real estate:
Commercial		20,926,702		142,780		12,479		54,329		151,685		172,246		21,460,221
Residential builder and developer		781,007		26,920		5,009		23,870		244,017		225,529		1,306,352
Other commercial construction		2,056,594		36,738		8,077		6,388		69,337		26,709		2,203,843
Residential		9,534,751		270,560		276,314		41,577		41,297		182,217		10,346,716
Residential Alt-A		340,568		25,203		—		—		—		95,733		461,504
Consumer:
Home equity lines and loans		6,300,811		44,791		—		17,799		4,231		56,300		6,423,932
Automobile		2,429,579		40,813		—		345		—		25,537		2,496,274
Other		2,647,950		34,270		4,967		2,197		—		19,154		2,708,538

Total	$	61,514,824		673,055		309,420		161,424		528,001		925,231		64,111,955


December 31, 2011
Commercial, financial, leasing, etc.	$	15,493,803		37,112		7,601		8,560		23,762		163,598		15,734,436
Real estate:
Commercial		19,658,761		172,641		9,983		54,148		192,804		171,111		20,259,448
Residential builder and developer		845,680		49,353		13,603		21,116		297,005		281,576		1,508,333
Other commercial construction		2,393,304		41,049		968		23,582		78,105		106,325		2,643,333
Residential		6,626,182		256,017		250,472		37,982		56,741		172,681		7,400,075
Residential Alt-A		383,834		34,077		—		—		—		105,179		523,090
Consumer:
Home equity lines and loans		6,570,675		43,516		—		15,409		4,635		47,150		6,681,385
Automobile		2,644,330		48,342		—		601		—		26,835		2,720,108
Other		2,551,225		43,547		5,249		2,340		310		23,126		2,625,797

Total	$	57,167,794		725,654		287,876		163,738		653,362		1,097,581		60,096,005

(a)

Acquired loans that were recorded at fair value at acquisition date. This category does not include purchased impaired loans that are presented separately.

(b)

Accruing loans that were impaired at acquisition date and were recorded at fair value.

Changes in Allowance for Credit Losses

Changes in the allowance for credit losses for the three months ended September 30, 2012 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(in thousands)
Beginning balance	$	244,728			341,521			93,269			164,352			73,158		917,028
Provision for credit losses		439			9,891			8,247			26,962			461		46,000
Net charge-offs
Charge-offs		(8,874	)		(7,982	)		(8,687	)		(24,553	)		—		(50,096	)
Recoveries		1,174			1,421			1,139			4,557			—		8,291

Net charge-offs		(7,700	)		(6,561	)		(7,548	)		(19,996	)		—		(41,805	)

Ending balance	$	237,467			344,851			93,968			171,318			73,619		921,223

Changes in the allowance for credit losses for the three months ended September 30, 2011 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated			Total
	(in thousands)
Beginning balance	$	209,879			401,111			87,341			137,309			71,949			907,589
Provision for credit losses		23,145			(545	)		8,264			27,231			(95	)		58,000
Net charge-offs
Charge-offs		(12,073	)		(13,712	)		(12,135	)		(28,576	)		—			(66,496	)
Recoveries		2,613			839			1,750			4,230			—			9,432

Net charge-offs		(9,460	)		(12,873	)		(10,385	)		(24,346	)		—			(57,064	)

Ending balance	$	223,564			387,693			85,220			140,194			71,854			908,525

Changes in the allowance for credit losses for the nine months ended September 30, 2012 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(in thousands)
Beginning balance	$	234,022			367,637			91,915			143,121			71,595		908,290
Provision for credit losses		29,663			4,322			30,064			88,927			2,024		155,000
Net charge-offs
Charge-offs		(32,989	)		(31,578	)		(32,812	)		(77,155	)		—		(174,534	)
Recoveries		6,771			4,470			4,801			16,425			—		32,467

Net charge-offs		(26,218	)		(27,108	)		(28,011	)		(60,730	)		—		(142,067	)

Ending balance	$	237,467			344,851			93,968			171,318			73,619		921,223

Changes in the allowance for credit losses for the nine months ended September 30, 2011 were as follows:


	Commercial, Financial,			Real Estate
	Leasing, etc.			Commercial			Residential			Consumer			Unallocated		Total
	(in thousands)
Beginning balance	$	212,579			400,562			86,351			133,067			70,382		902,941
Provision for credit losses		44,957			36,965			37,759			74,847			1,472		196,000
Net charge-offs
Charge-offs		(41,023	)		(54,206	)		(44,174	)		(81,837	)		—		(221,240	)
Recoveries		7,051			4,372			5,284			14,117			—		30,824

Net charge-offs		(33,972	)		(49,834	)		(38,890	)		(67,720	)		—		(190,416	)

Ending balance	$	223,564			387,693			85,220			140,194			71,854		908,525

Impaired Loans and Leases


	September 30, 2012						December 31, 2011
	Recorded investment		Unpaid principal balance		Related allowance		Recorded investment		Unpaid principal balance		Related allowance
	(in thousands)
With an allowance recorded:
Commercial, financial, leasing, etc.	$	106,448		126,156		29,911		118,538		145,510		48,674
Real estate:
Commercial		107,669		135,663		18,734		102,886		128,456		17,651
Residential builder and developer		134,298		260,010		34,228		159,293		280,869		52,562
Other commercial construction		74,306		77,938		7,749		20,234		24,639		3,836
Residential		103,184		121,141		5,027		101,882		119,498		4,420
Residential Alt-A		131,043		143,670		19,000		150,396		162,978		25,000
Consumer:
Home equity lines and loans		12,362		13,635		2,187		9,385		10,670		2,306
Automobile		50,886		50,886		15,012		53,710		53,710		11,468
Other		13,387		13,387		5,254		8,401		8,401		2,084

		733,583		942,486		137,102		724,725		934,731		168,001

With no related allowance recorded:
Commercial, financial, leasing, etc.		23,641		32,211		—		53,104		60,778		—
Real estate:
Commercial		70,667		92,453		—		71,636		91,118		—
Residential builder and developer		95,202		117,478		—		133,156		177,277		—
Other commercial construction		12,153		12,727		—		86,652		89,862		—
Residential		22,752		31,352		—		19,686		25,625		—
Residential Alt-A		34,533		63,703		—		34,356		60,942		—

		258,948		349,924		—		398,590		505,602		—

Total:
Commercial, financial, leasing, etc.		130,089		158,367		29,911		171,642		206,288		48,674
Real estate:
Commercial		178,336		228,116		18,734		174,522		219,574		17,651
Residential builder and developer		229,500		377,488		34,228		292,449		458,146		52,562
Other commercial construction		86,459		90,665		7,749		106,886		114,501		3,836
Residential		125,936		152,493		5,027		121,568		145,123		4,420
Residential Alt-A		165,576		207,373		19,000		184,752		223,920		25,000
Consumer:
Home equity lines and loans		12,362		13,635		2,187		9,385		10,670		2,306
Automobile		50,886		50,886		15,012		53,710		53,710		11,468
Other		13,387		13,387		5,254		8,401		8,401		2,084

Total	$	992,531		1,292,410		137,102		1,123,315		1,440,333		168,001

Interest Income Recognized on Loans


	Three months ended September 30, 2012						Three months ended September 30, 2011
			Interest income recognized						Interest income recognized
	Average recorded investment		Total		Cash basis		Average recorded investment		Total		Cash basis
	(in thousands)
Commercial, financial, leasing, etc.	$	141,166		1,507		1,507		152,368		1,172		1,166
Real estate:
Commercial		180,009		531		531		195,832		810		808
Residential builder and developer		237,847		476		370		338,897		422		98
Other commercial construction		84,604		9		9		96,482		62		51
Residential		131,114		1,269		765		98,885		1,183		630
Residential Alt-A		167,780		1,836		593		192,609		1,872		494
Consumer:
Home equity lines and loans		11,949		172		48		11,814		174		26
Automobile		51,138		863		185		56,071		957		262
Other		11,996		121		52		5,579		75		32

Total	$	1,017,603		6,784		4,060		1,148,537		6,727		3,567


	Nine months ended September 30, 2012						Nine months ended September 30, 2011
			Interest income recognized						Interest income recognized
	Average recorded investment		Total		Cash basis		Average recorded investment		Total		Cash basis
	(in thousands)
Commercial, financial, leasing, etc.	$	155,627		2,659		2,659		163,005		2,844		2,820
Real estate:
Commercial		179,524		2,087		2,087		191,818		1,705		1,630
Residential builder and developer		260,858		1,202		801		321,386		1,261		338
Other commercial construction		100,242		5,019		5,019		102,978		759		522
Residential		128,646		3,926		2,453		92,918		3,209		1,770
Residential Alt-A		174,390		5,432		1,666		199,066		5,858		1,455
Consumer:
Home equity lines and loans		11,024		502		136		11,989		523		74
Automobile		52,249		2,632		553		57,704		2,925		850
Other		10,097		320		138		4,124		187		51

Total	$	1,072,657		23,779		15,512		1,144,988		19,271		9,510

Summary of Loan Grades

The following table summarizes the loan grades applied to the various classes of the Company’s commercial and commercial real estate loans as of September 30, 2012 and December 31, 2011.


			Real Estate
	Commercial, Financial, Leasing, etc.		Commercial		Residential Builder and Developer		Other Commercial Construction
	(in thousands)
September 30, 2012
Pass	$	15,823,813		20,373,273		976,233		1,966,097
Criticized accrual		758,956		914,702		104,590		211,037
Criticized nonaccrual		121,806		172,246		225,529		26,709

Total	$	16,704,575		21,460,221		1,306,352		2,203,843

December 31, 2011
Pass	$	14,869,636		19,089,252		1,085,970		2,254,609
Criticized accrual		701,202		999,085		140,787		282,399
Criticized nonaccrual		163,598		171,111		281,576		106,325

Total	$	15,734,436		20,259,448		1,508,333		2,643,333

Loans and Leases Receivable Allowance by Impairment Methodology

At September 30, 2012 and December 31, 2011, 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)
September 30, 2012
Individually evaluated for impairment	$	29,738		59,794		23,953		22,453	$	135,938
Collectively evaluated for impairment		207,556		283,547		66,724		148,479		706,306
Purchased impaired		173		1,510		3,291		386		5,360

Allocated	$	237,467		344,851		93,968		171,318		847,604

Unallocated										73,619

Total									$	921,223

December 31, 2011
Individually evaluated for impairment	$	48,517		71,784		29,420		15,858	$	165,579
Collectively evaluated for impairment		185,048		291,271		60,742		126,613		663,674
Purchased impaired		457		4,582		1,753		650		7,442

Allocated	$	234,022		367,637		91,915		143,121		836,695

Unallocated										71,595

Total									$	908,290

Loans and Leases Receivable Net of Deferred Income by Impairment Methodology

The recorded investment in loans and leases summarized on the basis of the Company’s impairment methodology as of September 30, 2012 and December 31, 2011 was as follows:


	Commercial, Financial,		Real Estate
	Leasing, etc.		Commercial		Residential		Consumer		Total
	(in thousands)
September 30, 2012
Individually evaluated for impairment	$	129,916		488,493		290,023		76,676	$	985,108
Collectively evaluated for impairment		16,557,225		24,016,884		10,476,900		11,547,837		62,598,846
Purchased impaired		17,434		465,039		41,297		4,231		528,001

Total	$	16,704,575		24,970,416		10,808,220		11,628,744	$	64,111,955

December 31, 2011
Individually evaluated for impairment	$	171,442		561,615		306,320		71,496	$	1,110,873
Collectively evaluated for impairment		15,539,232		23,281,585		7,560,104		11,950,849		58,331,770
Purchased impaired		23,762		567,914		56,741		4,945		653,362

Total	$	15,734,436		24,411,114		7,923,165		12,027,290	$	60,096,005

Loan Modification Activities that were Considered Troubled Debt Restructurings

The tables below summarize the Company’s loan modification activities that were considered troubled debt restructurings for the three months ended September 30, 2012 and 2011:


			Recorded investment				Financial effects of modification
Three months ended September 30, 2012	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
			(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		21	$	7,823	$	7,653	$	(170	)	$	—
Combination of concession types		2		327		322		(5	)		(39	)
Real estate:
Commercial
Principal deferral		8		5,951		6,238		287			—
Combination of concession types		1		214		214		—			(49	)
Residential builder and developer
Principal deferral		11		17,383		16,275		(1,108	)		—
Combination of concession types		1		2,486		2,486		—			—
Other commercial construction
Principal deferral		2		5,429		4,702		(727	)		—
Residential
Principal deferral		5		738		772		34			—
Combination of concession types		18		5,490		5,553		63			(150	)
Residential Alt-A
Principal deferral		1		218		220		2			—
Combination of concession types		13		2,771		2,795		24			—
Consumer:
Home equity lines and loans
Principal deferral		5		434		434		—			—
Combination of concession types		11		976		976		—			(125	)
Automobile
Principal deferral		135		1,721		1,721		—			—
Interest rate reduction		9		157		157		—			(11	)
Other		20		68		68		—			—
Combination of concession types		109		2,329		2,329		—			(319	)
Other
Principal deferral		14		336		336		—			—
Other		1		1		1		—			—
Combination of concession types		22		339		339		—			(97	)

Total		409	$	55,191	$	53,591	$	(1,600	)	$	(790	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.


			Recorded investment				Financial effects of modification
Three months ended September 30, 2011	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
			(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		13	$	1,021	$	1,115	$	94		$	—
Real estate:
Commercial
Principal deferral		6		1,361		1,301		(60	)		—
Residential builder and developer
Other		1		1,700		1,350		(350	)		—
Other commercial construction
Principal deferral		2		6,161		6,284		123			—
Residential
Principal deferral		12		2,099		2,124		25			—
Interest rate reduction		1		86		86		—			(7	)
Combination of concession types		22		2,972		3,044		72			(51	)
Residential Alt-A
Principal deferral		1		532		562		30			—
Combination of concession types		8		1,393		1,446		53			(341	)
Consumer:
Home equity lines and loans
Principal deferral		1		50		50		—			—
Other		1		43		43		—			—
Combination of concession types		9		696		697		1			(157	)
Automobile
Principal deferral		159		1,655		1,655		—			—
Interest rate reduction		6		52		52		—			(4	)
Other		26		279		279		—			—
Combination of concession types		96		1,049		1,049		—			(57	)
Other
Principal deferral		7		186		186		—			—
Interest rate reduction		1		9		9		—			(1	)
Other		1		81		81		—			—
Combination of concession types		31		263		263		—			(63	)

Total		404	$	21,688	$	21,676	$	(12	)	$	(681	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.

The tables below summarize the Company’s loan modification activities that were considered troubled debt restructurings for the nine months ended September 30, 2012 and 2011:


			Recorded investment				Financial effects of modification
Nine months ended September 30, 2012	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
	(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		39	$	21,027	$	19,668	$	(1,359	)	$	—
Other		3		2,967		3,052		85			—
Combination of concession types		3		372		366		(6	)		(72	)
Real estate:
Commercial
Principal deferral		11		10,387		10,642		255			—
Interest rate reduction		1		383		430		47			(89	)
Combination of concession types		5		1,424		1,445		21			(305	)
Residential builder and developer
Principal deferral		19		26,708		24,812		(1,896	)		—
Combination of concession types		3		4,836		5,212		376			—
Other commercial construction
Principal deferral		5		66,317		65,600		(717	)		—
Residential
Principal deferral		27		3,302		3,447		145			—
Combination of concession types		47		10,475		10,658		183			(415	)
Residential Alt-A
Principal deferral		5		768		785		17			—
Combination of concession types		28		5,640		5,732		92			(49	)
Consumer:
Home equity lines and loans
Principal deferral		15		1,285		1,285		—			—
Interest rate reduction		1		144		144		—			(6	)
Combination of concession types		17		1,691		1,691		—			(272	)
Automobile
Principal deferral		484		6,306		6,306		—			—
Interest rate reduction		16		234		234		—			(16	)
Other		51		239		239		—			—
Combination of concession types		298		5,108		5,108		—			(601	)
Other
Principal deferral		73		1,117		1,117		—			—
Interest rate reduction		3		23		23		—			(3	)
Other		10		50		50		—			—
Combination of concession types		74		700		700		—			(155	)

Total		1,238	$	171,503	$	168,746	$	(2,757	)	$	(1,983	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.


			Recorded investment				Financial effects of modification
Nine months ended September 30, 2011	Number		Pre- modification		Post- modification		Recorded investment (a)			Interest (b)
	(dollars in thousands)
Commercial, financial, leasing, etc.
Principal deferral		46	$	8,302	$	8,396	$	94		$	—
Combination of concession types		1		1,945		1,945		—			(641	)
Real estate:
Commercial
Principal deferral		24		13,212		13,041		(171	)		—
Residential builder and developer
Principal deferral		4		18,586		17,661		(925	)		—
Other		6		118,114		110,156		(7,958	)		—
Combination of concession types		1		798		790		(8	)		—
Other commercial construction
Principal deferral		3		8,436		8,553		117			—
Residential
Principal deferral		24		2,869		2,884		15			—
Interest rate reduction		12		1,764		1,804		40			(70	)
Combination of concession types		81		16,066		16,385		319			(864	)
Residential Alt-A
Principal deferral		2		605		638		33			—
Combination of concession types		23		4,255		4,362		107			(572	)
Consumer:
Home equity lines and loans
Principal deferral		2		119		119		—			—
Other		1		43		43		—			—
Combination of concession types		19		1,484		1,486		2			(272	)
Automobile
Principal deferral		580		7,993		7,993		—			—
Interest rate reduction		17		183		183		—			(12	)
Other		83		537		537		—			—
Combination of concession types		318		5,049		5,049		—			(556	)
Other
Principal deferral		20		348		348		—			—
Interest rate reduction		1		9		9		—			(1	)
Other		2		92		92		—			—
Combination of concession types		77		482		482		—			(75	)

Total		1,347	$	211,291	$	202,956	$	(8,335	)	$	(3,063	)

(a)

Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages.

(b)

Represents the present value of interest rate concessions discounted at the effective rate of the original loan.

Shareholders' equity (Tables)

9 Months Ended

Sep. 30, 2012

Issued and Outstanding Preferred Stock

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


	Shares issued and outstanding		Carrying value September 30, 2012		Carrying value December 31, 2011
			(dollars in thousands)
Series A (a)(b)
Fixed Rate Cumulative Perpetual		230,000	$	226,232	$	224,277
Preferred Stock, Series A, $1,000 liquidation preference per share

Series C (a)(c)
Fixed Rate Cumulative Perpetual		151,500		144,184		140,308
Preferred Stock, Series C, $1,000 liquidation preference per share

Series D (d)
Fixed Rate Non-Cumulative
Perpetual Preferred Stock, Series D, $10,000 liquidation preference per share		50,000		500,000		500,000

(a)

(b)

On May 18, 2011, M&T redeemed and retired 370,000 shares of Series A Preferred Stock. Accelerated amortization of preferred stock discount associated with the redemption was $11.2 million.

(c)

Shares were assumed in an acquisition and a new Series C Preferred Stock was designated.

(d)

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
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-Section S99
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 150
-Paragraph 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29
-Article 5

+ Details

Pension plans and other postretirement benefits (Tables)

9 Months Ended

Sep. 30, 2012

Net Periodic Benefit Cost for Defined Benefit Plans


	Pension benefits						Other postretirement benefits
	Three months ended September 30
	2012			2011			2012		2011
				(in thousands)
Service cost	$	7,387			8,557			167		148
Interest cost on projected benefit obligation		15,509			16,155			934		1,038
Expected return on plan assets		(17,627	)		(16,718	)		—		—
Amortization of prior service cost		(1,640	)		(1,640	)		5		27
Amortization of net actuarial loss		9,291			5,132			133		9

Net periodic benefit cost	$	12,920			11,486			1,239		1,222


	Pension benefits						Other postretirement benefits
	Nine months ended September 30
	2012			2011			2012		2011
				(in thousands)
Service cost	$	22,162			20,270			501		388
Interest cost on projected benefit obligation		46,527			42,391			2,803		2,722
Expected return on plan assets		(52,883	)		(43,981	)		—		—
Amortization of prior service cost		(4,919	)		(4,919	)		15		81
Amortization of net actuarial loss		27,874			15,397			398		27

Net periodic benefit cost	$	38,761			29,158			3,717		3,218

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 4, 7, 16, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per common share (Tables)

9 Months Ended

Sep. 30, 2012

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:


	Three months ended						Nine months ended
	September 30						September 30
	2012			2011			2012			2011
	(in thousands, except per share)
Income available to common shareholders:

Net income	$	293,462			183,108		$	733,305			711,739
Less: Preferred stock dividends (a)		(13,363	)		(14,079	)		(40,088	)		(31,761	)
Amortization of preferred stock discount (a)		(2,033	)		(1,848	)		(5,921	)		(18,132	)

Net income available to common equity		278,066			167,181			687,296			661,846

Less: Income attributable to unvested stock-based compensation awards		(4,181	)		(2,513	)		(10,475	)		(9,905	)

Net income available to common shareholders	$	273,885			164,668			676,821			651,941

Weighted-average shares outstanding:

Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		127,741			126,478			127,449			123,855
Less: Unvested stock-based compensation awards		(1,922	)		(1,903	)		(1,939	)		(1,850	)

Weighted-average shares outstanding		125,819			124,575			125,510			122,005

Basic earnings per common share	$	2.18			1.32		$	5.39			5.34

(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:


	Three months ended						Nine months ended
	September 30						September 30
	2012			2011			2012			2011
	(in thousands, except per share)
Net income available to common equity	$	278,066			167,181		$	687,296			661,846

Less: Income attributable to unvested stock-based compensation awards		(4,170	)		(2,510	)		(10,454	)		(9,880	)
Net income available to common shareholders	$	273,896			164,671			676,842			651,966


Adjusted weighted-average shares outstanding:

Common and unvested stock-based compensation awards		127,741			126,478			127,449			123,855
Less: Unvested stock-based compensation awards		(1,923	)		(1,903	)		(1,939	)		(1,850	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and convertible preferred stock		474			285			426			516

Adjusted weighted-average shares outstanding		126,292			124,860			125,936			122,521

Diluted earnings per common share	$	2.17			1.32		$	5.37			5.32

- Definition

Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share.

+ References + Details

Comprehensive income (Tables)

9 Months Ended

Sep. 30, 2012

Components of Other Comprehensive Income

The following table displays the components of other comprehensive income (loss):


	Before-tax amount			Income taxes			Net
	(in thousands)
For the nine months ended September 30, 2012
Unrealized gains (losses) on investment securities:
Available-for-sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):
Unrealized holding losses, net	$	(5,251	)	$	2,061		$	(3,190	)
Less: OTTI charges recognized in net income		(27,976	)		10,980			(16,996	)

Net change for AFS investment securities with OTTI		22,725			(8,919	)		13,806
AFS investment securities – all other:
Unrealized holding gains, net		153,908			(60,362	)		93,546
Less: reclassification adjustment for gains realized in net income		9			(4	)		5

Net change for AFS investment securities – all other		153,899			(60,358	)		93,541
Held-to-maturity (“HTM”) investment securities with OTTI:
Unrealized holding losses, net		(2,848	)		1,118			(1,730	)
Less: reclassification to income of unrealized holding losses		(1,544	)		606			(938	)
Less: OTTI charges recognized in net income		(5,355	)		2,102			(3,253	)

Net change for HTM investment securities with OTTI		4,051			(1,590	)		2,461

Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		3,495			(1,372	)		2,123

Net unrealized gains on investment securities		184,170			(72,239	)		111,931

Reclassification to income for amortization of gains on terminated cash flow hedges		(178	)		66			(112	)
Foreign currency translation adjustment		552			(201	)		351
Defined benefit plans liability adjustment		23,368			(9,172	)		14,196

	$	207,912		$	(81,546	)	$	126,366

For the nine months ended September 30, 2011
Unrealized gains (losses) on investment securities:
AFS investment securities with OTTI:
Unrealized holding losses, net	$	(35,305	)	$	13,952		$	(21,353	)
Less: reclassification adjustment for gains realized in net income		3,814			(1,497	)		2,317
Less: OTTI charges recognized in net income		(41,713	)		16,372			(25,341	)

Net change for AFS investment securities with OTTI		2,594			(923	)		1,671
AFS investment securities — all other:
Unrealized holding gains, net		147,338			(57,629	)		89,709
Less: reclassification adjustment for gains realized in net income		146,115			(57,257	)		88,858

Net change for AFS investment securities – all other		1,223			(372	)		851
HTM investment securities with OTTI:
Unrealized holding losses, net		(8,500	)		3,336			(5,164	)
Less: reclassification to income of unrealized holding losses		(213	)		83			(130	)
Less: OTTI charges recognized in net income		(10,500	)		4,121			(6,379	)

Net change for HTM investment securities with OTTI		2,213			(868	)		1,345

Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM		5,108			(2,005	)		3,103

Net unrealized gains on investment securities		11,138			(4,168	)		6,970

Reclassification to income for amortization of gains on terminated cash flow hedges		(336	)		125			(211	)
Foreign currency translation adjustment		(779	)		276			(503	)
Defined benefit plans liability adjustment		10,586			(4,155	)		6,431

	$	20,609		$	(7,922	)	$	12,687

Accumulated Other Comprehensive Income (Loss), Net Consisted of Unrealized Gains (Losses)

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


									Foreign
						Cash			currency			Defined
	Investment securities					flow			translation			benefit
	With OTTI			All other		hedges			adjustment			plans			Total
	(in thousands)
Balance – January 1, 2012	$	(84,029	)		5,995		112			(803	)		(277,716	)		(356,441	)
Net gain (loss) during period		16,267			95,664		(112	)		351			14,196			126,366

Balance – September 30, 2012	$	(67,762	)		101,659		—			(452	)		(263,520	)		(230,075	)

Balance – January 1, 2011	$	(87,053	)		2,332		393			—			(120,892	)		(205,220	)
Net gain (loss) during period		3,016			3,954		(211	)		(503	)		6,431			12,687

Balance – September 30, 2011	$	(84,037	)		6,286		182			(503	)		(114,461	)		(192,533	)

Derivative financial instruments (Tables)

9 Months Ended

Sep. 30, 2012

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:


					Weighted-
	Notional		Average		average rate .
	amount		maturity		Fixed			Variable
	(in thousands)		(in years)
September 30, 2012
Fair value hedges:
Fixed rate long-term borrowings (a)	$	900,000		4.6		6.07	%		1.96	%

December 31, 2011
Fair value hedges:
Fixed rate long-term borrowings (a)	$	900,000		5.4		6.07	%		2.07	%

(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

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
	September 30, 2012		December 31, 2011		September 30, 2012		December 31, 2011
	(in thousands)
Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements (a)	$	153,220		147,302	$	—		—
Commitments to sell real estate loans (a)		127		232		16,804		2,287

		153,347		147,534		16,804		2,287
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale (a)		70,430		7,991		85		1,068
Commitments to sell real estate loans (a)		2,777		1,328		22,909		2,771
Trading:
Interest rate contracts (b)		441,467		443,033		410,929		415,836
Foreign exchange and other option and futures contracts (b)		13,462		19,115		13,383		18,723

		528,136		471,467		447,306		438,398

Total derivatives	$	681,483		619,001	$	464,110		440,685

(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 Consolidated Statement of Income


	Amount of unrealized gain (loss) recognized
	Three months ended September 30, 2012					Three months ended September 30, 2011
	Derivative		Hedged item			Derivative		Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	3,273		(3,252	)	$	42,587		(40,355	)

Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	777				$	2,425
Foreign exchange and other option and futures contracts (b)		74					1,764

Total	$	851				$	4,189


	Amount of unrealized gain (loss) recognized
	Nine months ended September 30, 2012						Nine months ended September 30, 2011
	Derivative			Hedged item			Derivative		Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	5,918			(5,876	)	$	52,127		(49,452	)

Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	3,996					$	3,901
Foreign exchange and other option and futures contracts (b)		(3,071	)					473

Total	$	925					$	4,374

(a)

Reported as other revenues from operations.

(b)

Reported as trading account and foreign exchange gains.

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2012

Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis

The following tables present assets and liabilities at September 30, 2012 and December 31, 2011 measured at estimated fair value on a recurring basis:


	Fair value measurements at September 30, 2012		Level 1 (a)		Level 2 (a)		Level 3
	(in thousands)
Trading account assets	$	526,844		55,391		471,453		—
Investment securities available for sale:
U.S. Treasury and federal agencies		56,345		—		56,345		—
Obligations of states and political subdivisions		33,980		—		33,980		—
Mortgage-backed securities:
Government issued or guaranteed		3,748,252		—		3,748,252		—
Privately issued residential		1,055,068		—		—		1,055,068
Privately issued commercial		10,568		—		—		10,568
Collateralized debt obligations		57,201		—		—		57,201
Other debt securities		109,405		—		109,405		—
Equity securities		113,059		106,789		6,270		—

		5,183,878		106,789		3,954,252		1,122,837

Real estate loans held for sale		976,083		—		976,083		—
Other assets (b)		226,554		—		156,124		70,430

Total assets	$	6,913,359		162,180		5,557,912		1,193,267

Trading account liabilities	$	424,312		—		424,312		—
Other liabilities (b)		39,798		—		39,713		85

1Total liabilities	$	464,110		—		464,025		85


	Fair value measurements at December 31, 2011		Level 1 (a)		Level 2 (a)		Level 3
	(in thousands)
Trading account assets	$	561,834		53,165		508,669		—
Investment securities available for sale:
U.S. Treasury and federal agencies		70,723		—		70,723		—
Obligations of states and political subdivisions		40,269		—		40,269		—
Mortgage-backed securities:
Government issued or guaranteed		4,521,233		—		4,521,233		—
Privately issued residential		1,136,256		—		—		1,136,256
Privately issued commercial		15,029		—		—		15,029
Collateralized debt obligations		52,500		—		—		52,500
Other debt securities		176,845		—		176,845		—
Equity securities		215,705		205,587		10,118		—

		6,228,560		205,587		4,819,188		1,203,785

Real estate loans held for sale		371,437		—		371,437		—
Other assets (b)		156,853		—		148,862		7,991

Total assets	$	7,318,684		258,752		5,848,156		1,211,776

Trading account liabilities	$	434,559		—		434,559		—
Other liabilities (b)		6,126		—		5,058		1,068

Total liabilities	$	440,685		—		439,617		1,068

(a)

There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the three months and nine months ended September 30, 2012 and 2011.

(b)

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 three months ended September 30, 2012 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – June 30, 2012	$	1,068,392		$	12,127		$	55,098		$	34,051

Total gains (losses) realized/unrealized:
Included in earnings		(5,672	)(a)		—			—			84,864	(b)
Included in other comprehensive income		39,963	(e)		640	(e)		3,297	(e)		—
Settlements		(47,615	)		(2,199	)		(1,194	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(48,570	)(d)

Balance – September 30, 2012	$	1,055,068		$	10,568		$	57,201		$	70,345

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2012	$	(5,672	)(a)	$	—		$	—		$	63,357	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three months ended September 30, 2011 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – June 30, 2011	$	1,306,202		$	17,233		$	61,601		$	13,171

Total gains (losses) realized/unrealized:
Included in earnings		(9,642	)(a)		—			—			13,565	(b)
Included in other comprehensive income		(4,030	)(e)		1,581	(e)		(9,482	)(e)		—
Settlements		(77,452	)		(1,985	)		(765	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(18,799	)(d)

Balance – September 30, 2011	$	1,215,078		$	16,829		$	51,354		$	7,937

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2011	$	(9,642	)(a)	$	—		$	—		$	5,926	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the nine months ended September 30, 2012 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – January 1, 2012	$	1,136,256		$	15,029		$	52,500		$	6,923

Total gains (losses) realized/unrealized:
Included in earnings		(27,976	)(a)		—			—			157,381	(b)
Included in other comprehensive income		87,646	(e)		1,751	(e)		7,008	(e)		—
Settlements		(140,858	)		(6,212	)		(2,307	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(93,959	)(d)

Balance – September 30, 2012	$	1,055,068		$	10,568		$	57,201		$	70,345

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2012	$	(27,976	)(a)	$	—		$	—		$	70,187	(b)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the nine months ended September 30, 2011 were as follows:


	Investment securities available for sale
	Privately issued residential mortgage-backed securities			Privately issued commercial mortgage-backed securities			Collateralized debt obligations			Other assets and other liabilities
	(in thousands)
Balance – January 1, 2011	$	1,435,561		$	22,407		$	110,756		$	2,244

Total gains (losses) realized/unrealized:
Included in earnings		(41,713	)(a)		—			—			56,809	(b)
Included in other comprehensive income		95,526	(e)		99	(e)		(2,276	)(e)		—
Purchases		—			—			50,790			—
Sales		—			—			(105,643	)		—
Settlements		(274,296	)		(5,677	)		(2,273	)		—
Transfers in and/or out of Level 3 (c)		—			—			—			(51,116	)(d)

Balance – September 30, 2011	$	1,215,078		$	16,829		$	51,354		$	7,937

Changes in unrealized gains (losses) included in earnings related to assets still held at September 30, 2011	$	(41,713	)(a)	$	—		$	—		$	7,932	(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)

Transfers out of Level 3 consist of interest rate locks transferred to closed loans.

(e)

Reported as net unrealized gains on investment securities in the consolidated statement of comprehensive income.

Quantitative Information Related to Significant Unobservable Inputs

The following table presents quantitative information about the significant unobservable inputs used in the fair value measurements for Level 3 assets and liabilities at September 30, 2012:


	Fair value at September 30, 2012		Valuation technique	Unobservable input/assumptions	Range (weighted- average)
Recurring fair value measurements

Privately issued mortgage–backed securities	$	1,065,636	Discounted cash flow	Probability of default	1%-40% (18%)
				Loss severity	32%-79% (49%)

Colateralized debt obligations		57,201	Discounted cash flow	Probability of default	3%-65% (15%)
				Loss severity	100%

Net other assets (liabilities)(a)		70,345	Discounted cash flow	Commitment expirations	0%-73% (22%)

Total level 3 assets, net of liabilities	$	1,193,182

(a)

Other level 3 assets (liabilities) consist of commitments to originate real estate loans.

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:


	September 30, 2012
	Carrying amount			Estimated fair value			Level 1		Level 2			Level 3
	(in thousands)
Financial assets:
Cash and cash equivalents	$	1,622,928		$	1,622,928		$	1,548,290	$	74,638		$	—
Interest-bearing deposits at banks		411,994			411,994			—		411,994			—
Trading account assets		526,844			526,844			55,391		471,453			—
Investment securities		6,624,004			6,577,450			106,789		5,192,015			1,278,646
Loans and leases:
Commercial loans and leases		16,704,575			16,482,866			—		—			16,482,866
Commercial real estate loans		24,970,416			24,703,443			—		175,518			24,527,925
Residential real estate loans		10,808,220			10,992,318			—		7,727,137			3,265,181
Consumer loans		11,628,744			11,512,448			—		—			11,512,448
Allowance for credit losses		(921,223	)		—			—		—			—

Loans and leases, net		63,190,732			63,691,075			—		7,902,655			55,788,420
Accrued interest receivable		244,021			244,021			—		244,021			—

Financial liabilities:
Noninterest-bearing deposits	$	(22,968,401	)	$	(22,968,401	)	$	—	$	(22,968,401	)	$	—
Savings deposits and NOW accounts		(34,663,695	)		(34,663,695	)		—		(34,663,695	)		—
Time deposits		(4,972,409	)		(4,999,049	)		—		(4,999,049	)		—
Deposits at Cayman Islands office		(1,402,753	)		(1,402,753	)		—		(1,402,753	)		—
Short-term borrowings		(592,154	)		(592,154	)		—		(592,154	)		—
Long-term borrowings		(4,969,536	)		(5,090,619	)		—		(5,090,619	)		—
Accrued interest payable		(78,591	)		(78,591	)		—		(78,591	)		—
Trading account liabilities		(424,312	)		(424,312	)		—		(424,312	)		—

Other financial instruments:
Commitments to originate real estate loans for sale	$	70,345		$	70,345		$	—	$	—		$	70,345
Commitments to sell real estate loans		(36,809	)		(36,809	)		—		(36,809	)		—
Other credit-related commitments		(112,713	)		(112,713	)		—		—			(112,713	)
Interest rate swap agreements used for interest rate risk management		153,220			153,220			—		153,220			—


	December 31, 2011
	Carrying amount			Estimated fair value
	(in thousands)
Financial assets:
Cash and cash equivalents	$	1,452,397		$	1,452,397
Interest-bearing deposits at banks		154,960			154,960
Trading account assets		561,834			561,834
Investment securities		7,673,154			7,608,008
Loans and leases:
Commercial loans and leases		15,734,436			15,507,342
Commercial real estate loans		24,411,114			24,024,585
Residential real estate loans		7,923,165			7,782,935
Consumer loans		12,027,290			11,869,813
Allowance for credit losses		(908,290	)		—

Loans and leases, net		59,187,715			59,184,675
Accrued interest receivable		222,618			222,618

Financial liabilities:
Noninterest-bearing deposits	$	(20,017,883	)	$	(20,017,883	)
Savings deposits and NOW accounts		(32,913,309	)		(32,913,309	)
Time deposits		(6,107,530	)		(6,133,806	)
Deposits at Cayman Islands office		(355,927	)		(355,927	)
Short-term borrowings		(782,082	)		(782,082	)
Long-term borrowings		(6,686,226	)		(6,720,174	)
Accrued interest payable		(67,900	)		(67,900	)
Trading account liabilities		(434,559	)		(434,559	)

Other financial instruments:
Commitments to originate real estate loans for sale	$	6,923		$	6,923
Commitments to sell real estate loans		(3,498	)		(3,498	)
Other credit-related commitments		(109,828	)		(109,828	)
Interest rate swap agreements used for interest rate risk management		147,302			147,302

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 14
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 33
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and contingencies (Tables)

9 Months Ended

Sep. 30, 2012

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.


	September 30,		December 31,
	2012		2011
	(in thousands)
Commitments to extend credit
Home equity lines of credit	$	6,319,441		6,393,332
Commercial real estate loans to be sold		282,162		177,982
Other commercial real estate and construction		3,578,153		2,818,071
Residential real estate loans to be sold		1,645,005		182,474
Other residential real estate		475,989		129,466
Commercial and other		10,315,662		10,442,754
Standby letters of credit		3,920,218		3,930,271
Commercial letters of credit		46,188		44,981
Financial guarantees and indemnification contracts		1,994,704		1,903,254
Commitments to sell real estate loans		2,337,536		635,899

Segment information (Tables)

9 Months Ended

Sep. 30, 2012

Information about Company's Segments

Information about the Company’s segments is presented in the following table:


	Three months ended September 30
	2012								2011
	Total revenues(a)		Inter- segment revenues			Net income (loss)			Total revenues(a)		Inter- segment revenues			Net income (loss)
	(in thousands)
Business Banking	$	114,181		1,011			38,411			110,627		957			31,237
Commercial Banking		255,498		1,561			112,654			230,023		1,318			93,783
Commercial Real Estate		169,806		5,031			75,896			152,878		410			65,566
Discretionary Portfolio		1,805		(25,593	)		(5,039	)		16,437		(3,968	)		2,077
Residential Mortgage Banking		138,662		28,454			44,727			67,757		25,012			10,805
Retail Banking		318,567		2,841			58,441			314,113		2,583			43,947
All Other		109,936		(13,305	)		(31,628	)		93,266		(26,312	)		(64,307	)

Total	$	1,108,455		—			293,462			985,101		—			183,108


	Nine months ended September 30
	2012									2011
	Total revenues(a)			Inter- segment revenues			Net income (loss)			Total revenues(a)		Inter- segment revenues			Net income (loss)
	(in thousands)
Business Banking	$	335,475			3,202			110,829			314,416		2,890			84,121
Commercial Banking		741,714			4,832			315,373			672,199		3,674			277,225
Commercial Real Estate		491,433			5,860			225,025			412,250		1,214			179,634
Discretionary Portfolio		(11,162	)		(60,990	)		(28,037	)		171,303		(16,174	)		76,566
Residential Mortgage Banking		341,699			100,350			94,238			183,910		44,018			21,556
Retail Banking		939,409			8,931			165,289			920,645		8,537			151,318
All Other		306,632			(62,185	)		(149,412	)		281,460		(44,159	)		(78,681	)

Total	$	3,145,200			—			733,305			2,956,183		—			711,739

Summary of Segment Information


	Average total assets
	Nine months ended				Year ended
	September 30				December 31
	2012		2011		2011
			(in millions)
Business Banking	$	4,918		4,995		5,192
Commercial Banking		19,691		17,397		17,650
Commercial Real Estate		16,364		14,730		15,025
Discretionary Portfolio		16,428		13,844		14,170
Residential Mortgage Banking		2,316		1,913		1,958
Retail Banking		11,746		11,904		11,940
All Other		8,055		7,706		8,042

Total	$	79,518		72,489		73,977

(a)

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	May 31, 2012	May 31, 2011 USD ($) shares	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Aug. 27, 2012 $ / shares	May 16, 2011 USD ($) Office shares
Business Acquisition [Line Items]
Total consideration in shares \| $ / shares									$ 0.08403
Investment securities			$ 6,624,004			$ 6,624,004		$ 7,673,154
Liabilities			71,139,706			71,139,706		68,653,078
Deposits			64,007,258			64,007,258		59,394,649
Provision for credit losses			46,000	$ 58,000		155,000	$ 196,000
Hudson City [Member]
Business Acquisition [Line Items]
Assets			41,900,000			41,900,000
Loans			27,800,000			27,800,000
Investment securities			12,500,000			12,500,000
Liabilities			37,200,000			37,200,000
Deposits			24,000,000			24,000,000
Long-term borrowing			$ 13,000,000			$ 13,000,000
Cash [Member]
Business Acquisition [Line Items]
Percentage of total consideration									40.00%
Common stock [Member]
Business Acquisition [Line Items]
Percentage of total consideration									60.00%
Minimum [Member]
Business Acquisition [Line Items]
Intangible Assets Amortization	5 years
Maximum [Member]
Business Acquisition [Line Items]
Intangible Assets Amortization		7 years
Wilmington Trust Corporation [Member]
Business Acquisition [Line Items]
Number of banking offices operated \| Office										55
Shares of M&T common stock exchanged for each share of Wilmington Trust common stock \| shares										0.051372
Common stock issued for acquisition \| shares		4,694,486
Common shares issued for acquisition fair value										$ 406,000
Assets acquired total										10,845,042
Loans and leases										6,410,430
Commercial real estate loans										3,200,000
Commercial loans and leases										1,400,000
Consumer loans										1,100,000
Residential real estate loans										680,000
Liabilities										10,044,555
Deposits										8,864,161
Value added in shareholders equity due to acquisition										406,000
Preferred stock redeemed in connection with Willington Trust acquisition										330,000
Core deposit and other intangibles										$ 112,000
Non taxable gain recorded in connection with acquisition		$ 65,000
Provision for credit losses					$ 41,000
Other- than-temporary impairment								$ 5,000

Acquisitions - Consideration Paid for Acquired Identifiable Assets and Liabilities (Detail) - Wilmington Trust Corporation [Member] - USD ($) $ in Thousands	1 Months Ended
	May 31, 2011	May 16, 2011
Purchase price:
Common shares issued (4,694,486 shares)		$ 405,557
Preferred stock purchased from U.S. Treasury		330,000
Total purchase price		735,557
Identifiable assets:
Cash and due from banks		178,940
Interest-bearing deposits at banks		2,606,265
Other short-term investments		57,817
Investment securities		510,390
Loans and leases		6,410,430
Core deposit and other intangibles		112,094
Other assets		969,106
Total identifiable assets		10,845,042
Liabilities:
Deposits		8,864,161
Short-term borrowings		147,752
Long-term borrowings		600,830
Other liabilities		431,812
Total liabilities		$ 10,044,555
Net gain resulting from acquisition	$ 64,930

Acquisitions - Consideration Paid for Acquired Identifiable Assets and Liabilities (Parenthetical) (Detail) shares in Thousands	May 16, 2011 shares
Wilmington Trust Corporation [Member]
Business Acquisition [Line Items]
Common shares issued	4,694,486

Acquisitions - Pro Forma Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2011 USD ($)
Business Acquisition [Line Items]
Total revenues pro forma	$ 3,190,437
Net income pro forma	$ 663,048

Acquisitions - Summary of Merger-Related Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of merger-related expenses
Salaries and employee benefits	$ 321,746	$ 325,197	$ 991,530	$ 891,465
Equipment and net occupancy	64,248	68,101	194,667	184,434
Printing, postage and supplies	8,272	10,593	31,512	29,518
Other costs of operations	$ 183,875	214,026	540,927	516,209
K Bank and Wilmington Trust Corporation Acquisition [Member]
Summary of merger-related expenses
Salaries and employee benefits		285	4,997	15,597
Equipment and net occupancy		119	15	223
Printing, postage and supplies		723		1,188
Other costs of operations		24,876	4,867	50,286
Total merger-related expenses		$ 26,003	$ 9,879	$ 67,294

- Definition

Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(b))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.6)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 16
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Paragraph 62
-IssueDate 2006-05-01
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 16
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 13
-Paragraph 16
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investment securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Other securities, Amortized Cost	$ 318,801	$ 366,886
Other securities, Gross Unrealized Gains
Other securities, Gross Unrealized Loss
Other securities, Estimated fair value	318,801	366,886
Investment securities, available for sale, amortized cost	5,091,116	6,312,423
Gross unrealized gains	279,693	210,001
Gross unrealized losses	186,931	293,864
Estimated fair value	5,183,878	6,228,560
Amortized cost for held to maturity	1,121,325	1,077,708
Gross unrealized gains for held to maturity	46,441	34,022
Gross unrealized losses for held to maturity	92,995	99,168
Estimated fair value for held to maturity	1,074,771	1,012,562
Total Amortized cost	6,531,242	7,757,017
Total for Gross unrealized gains	326,134	244,023
Total for Gross unrealized losses	279,926	393,032
Total for Estimated fair value	6,577,450	7,608,008
Obligations of states and political subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	33,402	39,518
Gross unrealized gains	588	771
Gross unrealized losses	10	20
Estimated fair value	33,980	40,269
Amortized cost for held to maturity	192,621	188,680
Gross unrealized gains for held to maturity	8,848	9,141
Gross unrealized losses for held to maturity	29	28
Estimated fair value for held to maturity	201,440	197,793
Mortgage-backed securities [Member] \| Government issued or guaranteed [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	3,502,237	4,344,116
Gross unrealized gains	246,190	177,392
Gross unrealized losses	175	275
Estimated fair value	3,748,252	4,521,233
Amortized cost for held to maturity	669,169	608,533
Gross unrealized gains for held to maturity	37,259	24,881
Estimated fair value for held to maturity	706,428	633,414
Mortgage-backed securities [Member] \| Privately issued [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Amortized cost for held to maturity	248,441	268,642
Gross unrealized gains for held to maturity	334
Gross unrealized losses for held to maturity	92,966	99,140
Estimated fair value for held to maturity	155,809	169,502
Mortgage-backed securities [Member] \| Privately issued residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	1,198,896	1,369,371
Gross unrealized gains	4,929	6,373
Gross unrealized losses	148,757	239,488
Estimated fair value	1,055,068	1,136,256
Mortgage-backed securities [Member] \| Privately issued commercial [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	10,837	17,679
Gross unrealized losses	269	2,650
Estimated fair value	10,568	15,029
Mortgage-backed securities [Member] \| Collateralized debt obligations [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	43,294	43,834
Gross unrealized gains	15,147	11,154
Gross unrealized losses	1,240	2,488
Estimated fair value	57,201	52,500
Other debt securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	136,418	216,700
Gross unrealized gains	2,146	4,588
Gross unrealized losses	29,159	44,443
Estimated fair value	109,405	176,845
Amortized cost for held to maturity	11,094	11,853
Estimated fair value for held to maturity	11,094	11,853
U.S. Treasury and federal agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	55,288	69,468
Gross unrealized gains	1,057	1,255
Estimated fair value	56,345	70,723
Equity securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	110,744	211,737
Gross unrealized gains	9,636	8,468
Gross unrealized losses	7,321	4,500
Estimated fair value	$ 113,059	$ 215,705

Investment securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment Holdings [Line Items]
Gross realized gains on investment securities			$ 90				$ 150,000
Government issued or guaranteed [Member]
Investment Holdings [Line Items]
Aggregate amortized cost on mortgage-backed securities					$ 484,000
Pre-tax gain on sale of mortgage-backed securities					$ 39,000
Mortgage-backed securities [Member]
Investment Holdings [Line Items]
Aggregate amortized cost on mortgage-backed securities				$ 1,000,000
Pre-tax gain on sale of mortgage-backed securities				$ 66,000
Pre-tax other-than-temporary impairment losses	$ 6,000		$ 10,000			$ 33,000	$ 52,000
Trust preferred securities [Member]
Investment Holdings [Line Items]
Aggregate amortized cost on mortgage-backed securities		$ 136,000
Pre-tax gain on sale of mortgage-backed securities		25,000
Collateralized debt obligations [Member]
Investment Holdings [Line Items]
Aggregate amortized cost on mortgage-backed securities		100,000
Pre-tax gain on sale of mortgage-backed securities		$ 20,000

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 5

+ Details

- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

+ References + Details

Investment securities - Changes in Credit Losses Associated with Debt Securities for Which Other-Than-Temporary Impairment Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Beginning balance	$ 264,197	$ 298,141	$ 285,399	$ 327,912
Additions for credit losses not previously recognized	5,672	9,642	33,331	52,213
Reductions for increases in cash flows		(90)		(5,110)
Reductions for realized losses	(67,926)	(23,127)	(116,787)	(90,449)
Ending balance	$ 201,943	$ 284,566	$ 201,943	$ 284,566

Investment securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) $ in Thousands	Sep. 30, 2012 USD ($)
Debt securities available for sale:b
Due in one year or less	$ 33,460
Due after one year through five years	42,405
Due after five years through ten years	8,611
Due after ten years	183,926
Total available for sale (amortized cost)	268,402
Mortgage-backed securities available for sale	4,711,970
Total	4,980,372
Debt securities held to maturity: c
Due in one year or less	36,459
Due after one year through five years	45,054
Due after five years through ten years	110,731
Due after ten years	11,471
Total available for held to maturity (amortized cost)	203,715
Mortgage-backed securities held to maturity	917,610
Total	1,121,325
Debt securities available for sale: b
Due in one year or less	33,496
Due after one year through five years	43,791
Due after five years through ten years	9,409
Due after ten years	170,235
Total available for available for sale (fair value)	256,931
Mortgage-backed securities available for sale	4,813,888
Total	5,070,819
Debt securities held to maturity:
Due in one year or less	36,660
Due after one year through five years	47,410
Due after five years through ten years	116,979
Due after ten years	11,485
Total available for held to maturity (fair value)	212,534
Mortgage-backed securities held to maturity	862,237
Total	$ 1,074,771

Investment securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held to maturity, Estimated fair value, Less than 12 months	$ 2,839	$ 4,967
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	(6)	(596)
Held to maturity, Estimated fair value, 12 months or more	157,711	168,569
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	(92,989)	(98,572)
Estimated fair value, Less than 12 months	97,059	421,016
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(4,338)	(29,096)
Estimated fair value, 12 months or more	949,352	851,849
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(182,593)	(264,768)
Total investment securities, fair value less than 12 months	99,898	425,983
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses	(4,344)	(29,692)
Total of investment securities, fair value, more than 12 months	1,107,063	1,020,418
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses	(275,582)	(363,340)
Privately issued mortgage-backed securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held to maturity, Estimated fair value, Less than 12 months		1,883
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses		(592)
Held to maturity, Estimated fair value, 12 months or more	155,189	167,139
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	(92,966)	(98,548)
Obligations of states and political subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Held to maturity, Estimated fair value, Less than 12 months	2,839	3,084
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	(6)	(4)
Held to maturity, Estimated fair value, 12 months or more	2,522	1,430
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	(23)	(24)
Estimated fair value, Less than 12 months	979
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(6)
Estimated fair value, 12 months or more	685	1,228
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(4)	(20)
Mortgage-backed securities [Member] \| Government issued or guaranteed [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Estimated fair value, Less than 12 months	5,838	38,492
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(28)	(190)
Estimated fair value, 12 months or more	9,319	6,017
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(147)	(85)
Mortgage-backed securities [Member] \| Privately issued residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Estimated fair value, Less than 12 months	81,620	297,133
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(454)	(14,188)
Estimated fair value, 12 months or more	828,916	751,077
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(148,303)	(225,300)
Mortgage-backed securities [Member] \| Privately issued commercial [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Estimated fair value, 12 months or more	9,744	15,029
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(269)	(2,650)
Collateralized debt obligations [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Estimated fair value, Less than 12 months	3,136	2,871
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(30)	(335)
Estimated fair value, 12 months or more	5,842	4,863
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(1,210)	(2,153)
Other debt securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Estimated fair value, Less than 12 months		72,637
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses		(9,883)
Estimated fair value, 12 months or more	93,266	73,635
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(29,159)	(34,560)
Equity securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Estimated fair value, Less than 12 months	5,486	9,883
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(3,820)	$ (4,500)
Estimated fair value, 12 months or more	1,580
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	$ (3,501)

Loans and leases and the allowance for credit losses - Outstanding Principal Balance and Carrying Amount of Loans that is Included in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Outstanding principal and carrying value of acquired loans recorded at fair value
Outstanding principal balance	$ 7,338,476	$ 9,203,366
Carrying Amount	6,383,467	8,159,787
Commercial, financial, leasing, etc [Member]
Outstanding principal and carrying value of acquired loans recorded at fair value
Carrying Amount	977,430	1,331,198
Real Estate Commercial [Member]
Outstanding principal and carrying value of acquired loans recorded at fair value
Carrying Amount	2,962,899	3,879,518
Residential real estate [Member]
Outstanding principal and carrying value of acquired loans recorded at fair value
Carrying Amount	742,977	915,371
Consumer [Member]
Outstanding principal and carrying value of acquired loans recorded at fair value
Carrying Amount	$ 1,700,161	$ 2,033,700

Loans and leases and the allowance for credit losses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jun. 30, 2012	Dec. 31, 2010
Loans And Leases Receivable [Line Items]
Contractual principal and interest payments	$ 528,000		$ 528,000		$ 653,000
Purchased impaired loans as a percentage of total assets			Less than 1% of the Company's assets		Less than 1% of the Company's assets
Interest income	87,372		$ 258,629
Accretable yield balance	703,312		$ 703,312		$ 838,765	$ 788,760
Loan delinquent period			90 days
Maturity period of line of credit			More than 150 days
Acquired Loans [Member]
Loans And Leases Receivable [Line Items]
Interest income	$ 87,000	$ 97,000	$ 259,000	$ 207,000
Accretable yield balance		$ 944,000		$ 944,000			$ 457,000

Loans and leases and the allowance for credit losses - Summary of Changes in Accretable Yield for Acquired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Credit Derivatives [Line Items]
Balance at beginning of period	$ 788,760	$ 838,765
Interest income	(87,372)	(258,629)
Reclassifications from (to) nonaccretable balance, net	542	140,786
Other	1,382	(17,610)
Balance at end of period	703,312	703,312
Purchase Impaired [Member]
Credit Derivatives [Line Items]
Balance at beginning of period	55,599	30,805
Interest income	(12,436)	(29,721)
Reclassifications from (to) nonaccretable balance, net	542	42,621
Balance at end of period	43,705	43,705
Other [Member]
Credit Derivatives [Line Items]
Balance at beginning of period	733,161	807,960
Interest income	(74,936)	(228,908)
Reclassifications from (to) nonaccretable balance, net		98,165
Other	1,382	(17,610)
Balance at end of period	$ 659,607	$ 659,607

Loans and leases and the allowance for credit losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Loans And Leases Receivable [Line Items]
Current	$ 61,514,824	$ 57,167,794
30-89 Days past due	673,055	725,654
Purchased impaired	528,001	653,362
Nonaccrual	925,231	1,097,581
Loans and leases, net of unearned discount	64,111,955	60,096,005
Commercial, financial, leasing, etc [Member]
Loans And Leases Receivable [Line Items]
Current	16,496,862	15,493,803
30-89 Days past due	50,980	37,112
Purchased impaired	17,434	23,762
Nonaccrual	121,806	163,598
Loans and leases, net of unearned discount	16,704,575	15,734,436
Commercial [Member]
Loans And Leases Receivable [Line Items]
Current	20,926,702	19,658,761
30-89 Days past due	142,780	172,641
Purchased impaired	151,685	192,804
Nonaccrual	172,246	171,111
Loans and leases, net of unearned discount	21,460,221	20,259,448
Residential builder and developer [Member]
Loans And Leases Receivable [Line Items]
Current	781,007	845,680
30-89 Days past due	26,920	49,353
Purchased impaired	244,017	297,005
Nonaccrual	225,529	281,576
Loans and leases, net of unearned discount	1,306,352	1,508,333
Other commercial construction [Member]
Loans And Leases Receivable [Line Items]
Current	2,056,594	2,393,304
30-89 Days past due	36,738	41,049
Purchased impaired	69,337	78,105
Nonaccrual	26,709	106,325
Loans and leases, net of unearned discount	2,203,843	2,643,333
Residential [Member]
Loans And Leases Receivable [Line Items]
Current	9,534,751	6,626,182
30-89 Days past due	270,560	256,017
Purchased impaired	41,297	56,741
Nonaccrual	182,217	172,681
Loans and leases, net of unearned discount	10,346,716	7,400,075
Residential Alt-A [Member]
Loans And Leases Receivable [Line Items]
Current	340,568	383,834
30-89 Days past due	25,203	34,077
Nonaccrual	95,733	105,179
Loans and leases, net of unearned discount	461,504	523,090
Home equity lines and loans [Member]
Loans And Leases Receivable [Line Items]
Current	6,300,811	6,570,675
30-89 Days past due	44,791	43,516
Purchased impaired	4,231	4,635
Nonaccrual	56,300	47,150
Loans and leases, net of unearned discount	6,423,932	6,681,385
Automobile [Member]
Loans And Leases Receivable [Line Items]
Current	2,429,579	2,644,330
30-89 Days past due	40,813	48,342
Nonaccrual	25,537	26,835
Loans and leases, net of unearned discount	2,496,274	2,720,108
Other [Member]
Loans And Leases Receivable [Line Items]
Current	2,647,950	2,551,225
30-89 Days past due	34,270	43,547
Purchased impaired		310
Nonaccrual	19,154	23,126
Loans and leases, net of unearned discount	2,708,538	2,625,797
Non-Acquired [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	309,420	287,876
Non-Acquired [Member] \| Commercial, financial, leasing, etc [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	2,574	7,601
Non-Acquired [Member] \| Commercial [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	12,479	9,983
Non-Acquired [Member] \| Residential builder and developer [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	5,009	13,603
Non-Acquired [Member] \| Other commercial construction [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	8,077	968
Non-Acquired [Member] \| Residential [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	276,314	250,472
Non-Acquired [Member] \| Other [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	4,967	5,249
Acquired [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	161,424	163,738
Acquired [Member] \| Commercial, financial, leasing, etc [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	14,919	8,560
Acquired [Member] \| Commercial [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	54,329	54,148
Acquired [Member] \| Residential builder and developer [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	23,870	21,116
Acquired [Member] \| Other commercial construction [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	6,388	23,582
Acquired [Member] \| Residential [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	41,577	37,982
Acquired [Member] \| Home equity lines and loans [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	17,799	15,409
Acquired [Member] \| Automobile [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	345	601
Acquired [Member] \| Other [Member]
Loans And Leases Receivable [Line Items]
90 days or more past due and accruing	$ 2,197	$ 2,340

Loans and leases and the allowance for credit losses - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 917,028	$ 907,589	$ 908,290	$ 902,941
Provision for credit losses	46,000	58,000	155,000	196,000
Net charge-offs
Charge-offs	(50,096)	(66,496)	(174,534)	(221,240)
Recoveries	8,291	9,432	32,467	30,824
Net charge-offs	(41,805)	(57,064)	(142,067)	(190,416)
Ending balance	921,223	908,525	921,223	908,525
Commercial, financial, leasing, etc [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	244,728	209,879	234,022	212,579
Provision for credit losses	439	23,145	29,663	44,957
Net charge-offs
Charge-offs	(8,874)	(12,073)	(32,989)	(41,023)
Recoveries	1,174	2,613	6,771	7,051
Net charge-offs	(7,700)	(9,460)	(26,218)	(33,972)
Ending balance	237,467	223,564	237,467	223,564
Real Estate Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	341,521	401,111	367,637	400,562
Provision for credit losses	9,891	(545)	4,322	36,965
Net charge-offs
Charge-offs	(7,982)	(13,712)	(31,578)	(54,206)
Recoveries	1,421	839	4,470	4,372
Net charge-offs	(6,561)	(12,873)	(27,108)	(49,834)
Ending balance	344,851	387,693	344,851	387,693
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	93,269	87,341	91,915	86,351
Provision for credit losses	8,247	8,264	30,064	37,759
Net charge-offs
Charge-offs	(8,687)	(12,135)	(32,812)	(44,174)
Recoveries	1,139	1,750	4,801	5,284
Net charge-offs	(7,548)	(10,385)	(28,011)	(38,890)
Ending balance	93,968	85,220	93,968	85,220
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	164,352	137,309	143,121	133,067
Provision for credit losses	26,962	27,231	88,927	74,847
Net charge-offs
Charge-offs	(24,553)	(28,576)	(77,155)	(81,837)
Recoveries	4,557	4,230	16,425	14,117
Net charge-offs	(19,996)	(24,346)	(60,730)	(67,720)
Ending balance	171,318	140,194	171,318	140,194
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	73,158	71,949	71,595	70,382
Provision for credit losses	461	(95)	2,024	1,472
Net charge-offs
Charge-offs
Recoveries
Net charge-offs
Ending balance	$ 73,619	$ 71,854	$ 73,619	$ 71,854

Loans and leases and the allowance for credit losses - Impaired Loans and Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 992,531	$ 1,123,315
Unpaid Principal Balance	1,292,410	1,440,333
Related Allowance	137,102	168,001
Commercial, financial, leasing, etc [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	130,089	171,642
Unpaid Principal Balance	158,367	206,288
Related Allowance	29,911	48,674
Commercial real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	178,336	174,522
Unpaid Principal Balance	228,116	219,574
Related Allowance	18,734	17,651
Residential builder and developer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	229,500	292,449
Unpaid Principal Balance	377,488	458,146
Related Allowance	34,228	52,562
Other commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	86,459	106,886
Unpaid Principal Balance	90,665	114,501
Related Allowance	7,749	3,836
Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	125,936	121,568
Unpaid Principal Balance	152,493	145,123
Related Allowance	5,027	4,420
Residential Alt-A [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	165,576	184,752
Unpaid Principal Balance	207,373	223,920
Related Allowance	19,000	25,000
Home equity lines and loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,362	9,385
Unpaid Principal Balance	13,635	10,670
Related Allowance	2,187	2,306
Automobile [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	50,886	53,710
Unpaid Principal Balance	50,886	53,710
Related Allowance	15,012	11,468
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,387	8,401
Unpaid Principal Balance	13,387	8,401
Related Allowance	5,254	2,084
Impaired financing receivable with recorded allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	733,583	724,725
Unpaid Principal Balance	942,486	934,731
Related Allowance	137,102	168,001
Impaired financing receivable with recorded allowance [Member] \| Commercial, financial, leasing, etc [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	106,448	118,538
Unpaid Principal Balance	126,156	145,510
Related Allowance	29,911	48,674
Impaired financing receivable with recorded allowance [Member] \| Commercial real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	107,669	102,886
Unpaid Principal Balance	135,663	128,456
Related Allowance	18,734	17,651
Impaired financing receivable with recorded allowance [Member] \| Residential builder and developer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	134,298	159,293
Unpaid Principal Balance	260,010	280,869
Related Allowance	34,228	52,562
Impaired financing receivable with recorded allowance [Member] \| Other commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	74,306	20,234
Unpaid Principal Balance	77,938	24,639
Related Allowance	7,749	3,836
Impaired financing receivable with recorded allowance [Member] \| Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	103,184	101,882
Unpaid Principal Balance	121,141	119,498
Related Allowance	5,027	4,420
Impaired financing receivable with recorded allowance [Member] \| Residential Alt-A [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	131,043	150,396
Unpaid Principal Balance	143,670	162,978
Related Allowance	19,000	25,000
Impaired financing receivable with recorded allowance [Member] \| Home equity lines and loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,362	9,385
Unpaid Principal Balance	13,635	10,670
Related Allowance	2,187	2,306
Impaired financing receivable with recorded allowance [Member] \| Automobile [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	50,886	53,710
Unpaid Principal Balance	50,886	53,710
Related Allowance	15,012	11,468
Impaired financing receivable with recorded allowance [Member] \| Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,387	8,401
Unpaid Principal Balance	13,387	8,401
Related Allowance	5,254	2,084
Impaired financing receivable with no related allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	258,948	398,590
Unpaid Principal Balance	349,924	505,602
Impaired financing receivable with no related allowance [Member] \| Commercial, financial, leasing, etc [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	23,641	53,104
Unpaid Principal Balance	32,211	60,778
Impaired financing receivable with no related allowance [Member] \| Commercial real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	70,667	71,636
Unpaid Principal Balance	92,453	91,118
Impaired financing receivable with no related allowance [Member] \| Residential builder and developer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	95,202	133,156
Unpaid Principal Balance	117,478	177,277
Impaired financing receivable with no related allowance [Member] \| Other commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,153	86,652
Unpaid Principal Balance	12,727	89,862
Impaired financing receivable with no related allowance [Member] \| Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	22,752	19,686
Unpaid Principal Balance	31,352	25,625
Impaired financing receivable with no related allowance [Member] \| Residential Alt-A [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	34,533	34,356
Unpaid Principal Balance	$ 63,703	$ 60,942

Loans and leases and the allowance for credit losses - Interest Income Recognized on Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loans And Leases Receivable [Line Items]
Average Recorded Investment	$ 1,017,603	$ 1,148,537	$ 1,072,657	$ 1,144,988
Interest Income Recognized, Total	6,784	6,727	23,779	19,271
Interest Income Recognized, Cash Basis	4,060	3,567	15,512	9,510
Commercial, financial, leasing, etc [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	141,166	152,368	155,627	163,005
Interest Income Recognized, Total	1,507	1,172	2,659	2,844
Interest Income Recognized, Cash Basis	1,507	1,166	2,659	2,820
Commercial real estate loans [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	180,009	195,832	179,524	191,818
Interest Income Recognized, Total	531	810	2,087	1,705
Interest Income Recognized, Cash Basis	531	808	2,087	1,630
Residential builder and developer [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	237,847	338,897	260,858	321,386
Interest Income Recognized, Total	476	422	1,202	1,261
Interest Income Recognized, Cash Basis	370	98	801	338
Other commercial construction [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	84,604	96,482	100,242	102,978
Interest Income Recognized, Total	9	62	5,019	759
Interest Income Recognized, Cash Basis	9	51	5,019	522
Residential [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	131,114	98,885	128,646	92,918
Interest Income Recognized, Total	1,269	1,183	3,926	3,209
Interest Income Recognized, Cash Basis	765	630	2,453	1,770
Residential Alt-A [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	167,780	192,609	174,390	199,066
Interest Income Recognized, Total	1,836	1,872	5,432	5,858
Interest Income Recognized, Cash Basis	593	494	1,666	1,455
Home equity lines and loans [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	11,949	11,814	11,024	11,989
Interest Income Recognized, Total	172	174	502	523
Interest Income Recognized, Cash Basis	48	26	136	74
Automobile [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	51,138	56,071	52,249	57,704
Interest Income Recognized, Total	863	957	2,632	2,925
Interest Income Recognized, Cash Basis	185	262	553	850
Other [Member]
Loans And Leases Receivable [Line Items]
Average Recorded Investment	11,996	5,579	10,097	4,124
Interest Income Recognized, Total	121	75	320	187
Interest Income Recognized, Cash Basis	$ 52	$ 32	$ 138	$ 51

Loans and leases and the allowance for credit losses - Summary of Loan Grades (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 64,111,955	$ 60,096,005
Commercial, financial, leasing, etc [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	16,704,575	15,734,436
Commercial, financial, leasing, etc [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,823,813	14,869,636
Commercial, financial, leasing, etc [Member] \| Criticized Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	758,956	701,202
Commercial, financial, leasing, etc [Member] \| Criticized Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	121,806	163,598
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21,460,221	20,259,448
Commercial [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	20,373,273	19,089,252
Commercial [Member] \| Criticized Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	914,702	999,085
Commercial [Member] \| Criticized Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	172,246	171,111
Residential builder and developer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,306,352	1,508,333
Residential builder and developer [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	976,233	1,085,970
Residential builder and developer [Member] \| Criticized Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	104,590	140,787
Residential builder and developer [Member] \| Criticized Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	225,529	281,576
Other commercial construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,203,843	2,643,333
Other commercial construction [Member] \| Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,966,097	2,254,609
Other commercial construction [Member] \| Criticized Accrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	211,037	282,399
Other commercial construction [Member] \| Criticized Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 26,709	$ 106,325

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References + Details

Loans and leases and the allowance for credit losses - Loans and Leases Receivable Allowance by Impairment Methodology (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Loans And Leases Receivable [Line Items]
Allowance for credit losses	$ 921,223	$ 908,290
Allocated [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	847,604	836,695
Unallocated [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	73,619	71,595
Individually evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	135,938	165,579
Collectively evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	706,306	663,674
Purchased impaired [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	5,360	7,442
Commercial, financial, leasing, etc [Member] \| Allocated [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	237,467	234,022
Commercial, financial, leasing, etc [Member] \| Individually evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	29,738	48,517
Commercial, financial, leasing, etc [Member] \| Collectively evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	207,556	185,048
Commercial, financial, leasing, etc [Member] \| Purchased impaired [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	173	457
Commercial real estate loans [Member] \| Allocated [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	344,851	367,637
Commercial real estate loans [Member] \| Individually evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	59,794	71,784
Commercial real estate loans [Member] \| Collectively evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	283,547	291,271
Commercial real estate loans [Member] \| Purchased impaired [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	1,510	4,582
Residential real estate [Member] \| Allocated [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	93,968	91,915
Residential real estate [Member] \| Individually evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	23,953	29,420
Residential real estate [Member] \| Collectively evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	66,724	60,742
Residential real estate [Member] \| Purchased impaired [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	3,291	1,753
Consumer loans [Member] \| Allocated [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	171,318	143,121
Consumer loans [Member] \| Individually evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	22,453	15,858
Consumer loans [Member] \| Collectively evaluated for impairment [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	148,479	126,613
Consumer loans [Member] \| Purchased impaired [Member]
Loans And Leases Receivable [Line Items]
Allowance for credit losses	$ 386	$ 650

Loans and leases and the allowance for credit losses - Loans and leases receivable net of deferred income by impairment methodology (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 64,111,955	$ 60,096,005
Individually evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	985,108	1,110,873
Collectively evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	62,598,846	58,331,770
Purchased impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	528,001	653,362
Commercial, financial, leasing, etc [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	16,704,575	15,734,436
Commercial, financial, leasing, etc [Member] \| Individually evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	129,916	171,442
Commercial, financial, leasing, etc [Member] \| Collectively evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	16,557,225	15,539,232
Commercial, financial, leasing, etc [Member] \| Purchased impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	17,434	23,762
Commercial real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	24,970,416	24,411,114
Commercial real estate loans [Member] \| Individually evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	488,493	561,615
Commercial real estate loans [Member] \| Collectively evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	24,016,884	23,281,585
Commercial real estate loans [Member] \| Purchased impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	465,039	567,914
Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,808,220	7,923,165
Residential real estate [Member] \| Individually evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	290,023	306,320
Residential real estate [Member] \| Collectively evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,476,900	7,560,104
Residential real estate [Member] \| Purchased impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	41,297	56,741
Consumer loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,628,744	12,027,290
Consumer loans [Member] \| Individually evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	76,676	71,496
Consumer loans [Member] \| Collectively evaluated for impairment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,547,837	11,950,849
Consumer loans [Member] \| Purchased impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 4,231	$ 4,945

- Definition

+ References + Details

Borrowings - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Schedule Of Borrowings [Line Items]
Junior subordinated debentures face value	$ 1,200
Junior subordinated debentures	$ 1,200	$ 1,200
Junior Subordinated Debentures Maturity Date	Jan. 31, 2068
Debt Maturity, Start Year	Jan. 01, 2027
Debt Maturity, End Year	Dec. 31, 2068
Rate on related enhanced trust preferred securities	8.50%
End date of restrictions included in the replacement capital covenant	Jan. 31, 2048
Period of days prior to redemption or repurchase of enhanced trust preferred securities applicable to provisions of the replacement capital covenant	180 days
Junior Subordinated Debenture due January 31, 2068 [Member]
Schedule Of Borrowings [Line Items]
Junior subordinated debentures	$ 350

Shareholders' equity - Additional Information (Detail)	1 Months Ended
Shareholders' equity - Additional Information (Detail)	May 31, 2011 shares	Sep. 30, 2012 $ / shares $ / EquityUnit shares	Dec. 31, 2011 $ / shares $ / EquityUnit shares
Class of Stock [Line Items]
Preferred stock, shares authorized		1,000,000	1,000,000
Preferred stock, par value \| $ / shares		$ 1.00	$ 1.00
Preferred stock, shares redeemed	330,000,000
Ten Year Warrant Series D Preferred [Member]
Class of Stock [Line Items]
Exercise price of each class of warrants or rights outstanding \| $ / EquityUnit		518.96	518.96
Ten-year warrant to purchase common stock		95,383	95,383

Shareholders' equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares issued	381,500	381,500
Carrying value	$ 870,416	$ 864,585
Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares issued	230,000
Carrying value	$ 226,232	$ 224,277
Series C Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation preference	$ 1,000	$ 1,000
Preferred stock, shares issued	151,500
Carrying value	$ 144,184	$ 140,308
Series D Fixed Rate Non-Cumulative Perpetual Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation preference	$ 10,000	$ 10,000
Preferred stock, shares issued	50,000
Carrying value	$ 500,000	$ 500,000

- Definition

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References + Details

- Definition

Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

+ References + Details

Shareholders' equity - Issued and Outstanding Preferred Stock (Parenthetical) (Detail) $ in Millions	1 Months Ended		9 Months Ended
	Aug. 30, 2012	May 31, 2011 USD ($) shares	Sep. 30, 2012 $ / EquityUnit shares
Class of Stock [Line Items]
Preferred stock dividend rate			9.00%
Change in the dividend rate after the respective five-year anniversary date	6.375%
Date of change in the dividend rate	Nov. 15, 2013
Preferred shares redemption date	Nov. 15, 2018
Preferred stock, shares redeemed		330,000,000
Redemption days of shares by Company		90 days
Series A [Member]
Class of Stock [Line Items]
Exercise price of each class of warrants or rights outstanding \| $ / EquityUnit			73.86
Preferred stock, shares redeemed		370,000
Accelerated amortization of preferred stock discount as per redemption \| $		$ 11.2
Series D [Member]
Class of Stock [Line Items]
Preferred stock dividend rate		6.875%
Ten Year Warrant Series A Preferred [Member]
Class of Stock [Line Items]
Ten-year warrant to purchase common stock			1,218,522
Ten Year Warrant Series C Preferred [Member]
Class of Stock [Line Items]
Ten-year warrant to purchase common stock			407,542
Series C [Member]
Class of Stock [Line Items]
Exercise price of each class of warrants or rights outstanding \| $ / EquityUnit			55.76
Preferred series A and C first five years [Member]
Class of Stock [Line Items]
Preferred stock dividend rate			5.00%

Pension plans and other postretirement benefits - Net Periodic Benefit Cost for Defined Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,387	$ 8,557	$ 22,162	$ 20,270
Interest cost on projected benefit obligation	15,509	16,155	46,527	42,391
Expected return on plan assets	(17,627)	(16,718)	(52,883)	(43,981)
Amortization of prior service cost	(1,640)	(1,640)	(4,919)	(4,919)
Amortization of net actuarial loss	9,291	5,132	27,874	15,397
Net periodic benefit cost	12,920	11,486	38,761	29,158
Other postretirement benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	167	148	501	388
Interest cost on projected benefit obligation	934	1,038	2,803	2,722
Amortization of prior service cost	5	27	15	81
Amortization of net actuarial loss	133	9	398	27
Net periodic benefit cost	$ 1,239	$ 1,222	$ 3,717	$ 3,218

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Pension plans and other postretirement benefits - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined contribution pension and retirement savings plans total expense	$ 11,289,000	$ 10,455,000	$ 37,304,000	$ 30,521,000
Employer contributions			$ 200,000,000

- Definition

The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings per common share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income available to common shareholders:
Net income	$ 293,462	$ 183,108	$ 733,305	$ 711,739
Less: Preferred stock dividends (a)	(13,363)	(14,079)	(40,088)	(31,761)
Amortization of preferred stock discount (a)	(2,033)	(1,848)	(5,921)	(18,132)
Net income available to common equity	278,066	167,181	687,296	661,846
Less: Income attributable to unvested stock-based compensation awards	(4,181)	(2,513)	(10,475)	(9,905)
Net income available to common shareholders	$ 273,885	$ 164,668	$ 676,821	$ 651,941
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	127,741	126,478	127,449	123,855
Less: Unvested stock-based compensation awards	(1,922)	(1,903)	(1,939)	(1,850)
Weighted-average shares outstanding	125,819	124,575	125,510	122,005
Basic earnings per common share	$ 2.18	$ 1.32	$ 5.39	$ 5.34

Earnings per common share - Computations of Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Computations of diluted earnings per common share
Net income available to common equity	$ 278,066	$ 167,181	$ 687,296	$ 661,846
Less: Income attributable to unvested stock-based compensation awards	(4,170)	(2,510)	(10,454)	(9,880)
Net income available to common shareholders	$ 273,896	$ 164,671	$ 676,842	$ 651,966
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards	127,741	126,478	127,449	123,855
Less: Unvested stock-based compensation awards	(1,922)	(1,903)	(1,939)	(1,850)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and convertible preferred stock	474	285	426	516
Adjusted weighted-average shares outstanding	126,292	124,860	125,936	122,521
Diluted earnings per common share	$ 2.17	$ 1.32	$ 5.37	$ 5.32

Earnings Per Common share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	9.7	11.2	9.9	10.6

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Comprehensive income - Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Available-for-sale ("AFS") investment securities with other- than- temporary impairment ("OTTI"):
Unrealized holding losses, net, before-tax amount			$ (5,251)	$ (35,305)
Less: reclassification adjustment for gains realized in net income, before tax amount				3,814
Less: OTTI charges recognized in net income, before tax amount			(27,976)	(41,713)
Net change for AFS investment securities with OTTI, before tax			22,725	2,594
AFS investment securities - all other:
Unrealized holding gains during period, net, before-tax amount			153,908	147,338
Less: reclassification adjustment for gains realized in net income, before-tax amount			9	146,115
Net change for AFS investment securities - all other, before tax			153,899	1,223
Held- to- maturity ("HTM") investment securities with OTTI:
Unrealized holding gains on HTM securities, net, before-tax amount			(2,848)	(8,500)
Less: reclassification to income of unrealized holding losses, before tax			(1,544)	(213)
Less: OTTI charges recognized in net income, before tax			(5,355)	(10,500)
Net change for HTM investment securities with OTTI, before tax			4,051	2,213
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM, before tax			3,495	5,108
Net unrealized gains (losses) on investment securities, before tax			184,170	11,138
Reclassification to income for amortization of gains on terminated cash flow hedges , before tax			(178)	(336)
Foreign currency translation adjustment, before tax			552	(779)
Defined benefit plans liability adjustment, before tax amount			23,368	10,586
Total Comprehensive Income, before-tax amount			207,912	20,609
Unrealized holding losses, net, income taxes			2,061	13,952
Less: reclassification adjustment for gains realized in net income, income taxes				(1,497)
Less: OTTI charges recognized in net income, income taxes			10,980	16,372
Net change for AFS investment securities with OTTI, income taxes			(8,919)	(923)
Unrealized holding gains during period, net, income taxes			(60,362)	(57,629)
Less: reclassification adjustment for gains realized in net income, income taxes			(4)	(57,257)
Net change for AFS investment securities - all other, tax			(60,358)	(372)
Unrealized holding gains on HTM securities, net, income taxes			1,118	3,336
Less: reclassification to income of unrealized holding losses, tax			606	83
Less: OTTI charges recognized in net income, tax			2,102	4,121
Net change for HTM investment securities with OTTI, tax			(1,590)	(868)
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM, Tax			(1,372)	(2,005)
Net unrealized gains (losses) on investment securities, income taxes			(72,239)	(4,168)
Reclassification to income for amortization of gains on terminated cash flow hedges, income taxes			66	125
Foreign currency translation adjustment, tax			(201)	276
Defined benefit plans liability adjustment, income taxes			(9,172)	(4,155)
Total Comprehensive Income, income taxes			(81,546)	(7,922)
Unrealized holding losses, net, net of tax amount			(3,190)	(21,353)
Less: reclassification adjustment for gains realized in net income, net				2,317
Less: OTTI charges recognized in net income, net			(16,996)	(25,341)
Net change for AFS investment securities with OTTI, after tax			13,806	1,671
Unrealized holding gains during period, net, net of tax amount			93,546	89,709
Less: reclassification adjustment for gains realized in net income, net			5	88,858
Net change for AFS investment securities - all other, net of tax			93,541	851
Unrealized holding gains on HTM securities, net, net of tax amount			(1,730)	(5,164)
Less: reclassification to income of unrealized holding losses, net of tax			(938)	(130)
Less: OTTI charges recognized in net income, net of tax			(3,253)	(6,379)
Net change for HTM investment securities with OTTI, net of tax			2,461	1,345
Reclassification to income of unrealized holding losses on investment securities previously transferred from AFS to HTM, net of tax			2,123	3,103
Net unrealized gains (losses) on investment securities, net of tax	$ 42,560	$ 34,862	111,931	6,970
Reclassification to income for amortization of gains on terminated cash flow hedges		(70)	(112)	(211)
Foreign currency translation adjustment, net of tax	482	(699)	351	(503)
Defined benefit plans liability adjustment	4,732	2,143	14,196	6,431
Total other comprehensive income	$ 47,774	$ 36,236	$ 126,366	$ 12,687

Comprehensive income - Accumulated Other Comprehensive Income (Loss), Net Consisted of Unrealized Gains (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (356,441)	$ (205,220)
Net gain (loss) during period	$ 47,774	$ 36,236	126,366	12,687
Ending Balance	(230,075)	(192,533)	(230,075)	(192,533)
Cash flow hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			112	393
Net gain (loss) during period			(112)	(211)
Ending Balance		182		182
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(803)
Net gain (loss) during period			351	(503)
Ending Balance	(452)	(503)	(452)	(503)
Defined benefit plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(277,716)	(120,892)
Net gain (loss) during period			14,196	6,431
Ending Balance	(263,520)	(114,461)	(263,520)	(114,461)
Investment securities [Member] \| Investment securities With OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(84,029)	(87,053)
Net gain (loss) during period			16,267	3,016
Ending Balance	(67,762)	(84,037)	(67,762)	(84,037)
Investment securities [Member] \| Investment securities All other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			5,995	2,332
Net gain (loss) during period			95,664	3,954
Ending Balance	$ 101,659	$ 6,286	$ 101,659	$ 6,286

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

- Definition

Net of tax amount of other comprehensive income (loss) attributable to the parent entity.

+ References

+ Details

Derivative financial instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Derivative [Line Items]
Increase in net interest income due to interest rate swap agreements	$ 9	$ 9	$ 27	$ 28
Notional value of foreign currency and other option and future contracts entered into trading purposes	1,200		1,200		$ 1,400
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans			81		12
Aggregate fair value of derivative financial instruments in a net liability position	330		330
Collateral already posted aggregate fair value derivative instruments in net liability position	306		306
Fair value of collateral already posted for derivative financial instruments	71		71
Maximum amount of additional collateral required to post to counterparties	24		24
Interest rate swap counterparty collateral postings	77		77
Interest rate contracts [Member]
Derivative [Line Items]
Notional value of interest rate contracts entered into trading purposes	15,100		15,100		$ 13,900
Credit Risk Derivative [Member]
Derivative [Line Items]
Aggregate fair value of derivative financial instruments in a net liability position	$ 95		$ 95

Derivative financial instruments - Information About Interest Rate Swap Agreements (Detail) - Fixed rate long-term borrowings [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional amount	$ 900,000	$ 900,000
Average maturity (in years)	4 years 7 months 6 days	5 years 4 months 24 days
Weighted-average rate, fixed	6.07%	6.07%
Weighted-average rate, variable	1.96%	2.07%

Derivative financial instruments - Information About Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	$ 681,483	$ 619,001
Liability derivatives, fair value	464,110	440,685
Derivatives designated and qualifying as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	153,347	147,534
Liability derivatives, fair value	16,804	2,287
Derivatives designated and qualifying as hedging instruments [Member] \| Interest rate swap agreements [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	153,220	147,302
Liability derivatives, fair value
Derivatives designated and qualifying as hedging instruments [Member] \| Commitments to sell real estate loans [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	127	232
Liability derivatives, fair value	16,804	2,287
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	528,136	471,467
Liability derivatives, fair value	447,306	438,398
Not Designated as Hedging Instrument [Member] \| Commitments to sell real estate loans [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	2,777	1,328
Liability derivatives, fair value	22,909	2,771
Not Designated as Hedging Instrument [Member] \| Mortgage-related commitments to originate real estate loans for sale [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	70,430	7,991
Liability derivatives, fair value	85	1,068
Not Designated as Hedging Instrument [Member] \| Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	441,467	443,033
Liability derivatives, fair value	410,929	415,836
Not Designated as Hedging Instrument [Member] \| Foreign exchange and other option and futures contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives, fair value	13,462	19,115
Liability derivatives, fair value	$ 13,383	$ 18,723

Derivative financial instruments - Information About Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, derivatives	$ 851	$ 4,189	$ 925	$ 4,374
Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, derivatives	777	2,425	3,996	3,901
Foreign exchange and other option and futures contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, derivatives	74	1,764	(3,071)	473
Interest rate swap agreements [Member] \| Fixed rate long-term borrowings [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives in fair value hedging relationships, derivatives	3,273	42,587	5,918	52,127
Derivatives in fair value hedging relationships, hedged item	$ (3,252)	$ (40,355)	$ (5,876)	$ (49,452)

Variable interest entities and asset securitizations - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2012	Dec. 31, 2011
Accounting Policies [Line Items]
Carrying value of loans in the securitization trusts	$ 162	$ 196
Combined outstanding principal amount of mortgage backed securities issued by qualified special purpose trusts held by unrelated parties	24	30
Other assets for its "investment" in the common securities recognized by the company of various trusts	34
Total assets of real estate partnerships in which the company invested	1,400	1,400
Maximum exposure to loss of investments in real estate partnerships	260	271
Unfunded commitments included in company's maximum exposure to loss of investments in real estate partnerships	$ 66	$ 75

Fair value measurements - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of independent pricing sources used to value privately issued residential mortgage backed securities valued with internal modeling	2		2		2
Privately issued residential mortgage backed securities at cost	$ 1,200		$ 1,200		$ 1,300
Weighted-average reliance on internal model pricing, in percentage			33.00%
Average weighting placed on the values provided by the independent sources, in percentage			67.00%
Privately issued residential mortgage - backed securities with internal modeling, at cost	1,200		$ 1,200
Fair value of privately issued residential mortgage-backed securities valued with internal modeling	1,000		$ 1,000
Weighted-average market yield			6.50%
Debt instrument weighted average basis spread on variable rate			8.00%
Securities issued by financial institutions and other entities backed by trust preferred securities at cost	43		$ 43		44
Fair value of securities issued by financial institutions and other entities backed by trust preferred securities	57		57		$ 53
Other-than-temporary impairment losses			5	$ 11
Loans measured at fair value on nonrecurring basis	320	$ 506	320	506
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves	17	38	47	137
Nonrecurring fair value measurement	51	53	51	53
Changes in fair value recognized for those foreclosed assets held	1	6	10	17
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	221	355	221	355
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	$ 99	$ 151	$ 99	$ 151
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Margin	4.00%		4.00%
Discount rates for fair value estimations			10.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount Margin	10.00%		10.00%
Discount rates for fair value estimations			85.00%

Fair value measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	$ 526,844	$ 561,834
Investment securities	5,183,878	6,228,560
Real estate loans held for sale	976,083	371,437
Other assets	226,554	156,853
Total assets	6,913,359	7,318,684
Trading account liabilities	424,312	434,559
Other liabilities	39,798	6,126
1Total liabilities	464,110	440,685
U.S. Treasury and federal agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	56,345	70,723
Obligations of states and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	33,980	40,269
Government issued or guaranteed [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	3,748,252	4,521,233
Privately issued residential [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	1,055,068	1,136,256
Privately issued commercial [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	10,568	15,029
Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	57,201	52,500
Other debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	109,405	176,845
Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	113,059	215,705
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	55,391	53,165
Investment securities	106,789	205,587
Total assets	162,180	258,752
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	106,789	205,587
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account assets	471,453	508,669
Investment securities	3,954,252	4,819,188
Real estate loans held for sale	976,083	371,437
Other assets	156,124	148,862
Total assets	5,557,912	5,848,156
Trading account liabilities	424,312	434,559
Other liabilities	39,713	5,058
1Total liabilities	464,025	439,617
Significant Observable Inputs (Level 2) [Member] \| U.S. Treasury and federal agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	56,345	70,723
Significant Observable Inputs (Level 2) [Member] \| Obligations of states and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	33,980	40,269
Significant Observable Inputs (Level 2) [Member] \| Government issued or guaranteed [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	3,748,252	4,521,233
Significant Observable Inputs (Level 2) [Member] \| Other debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	109,405	176,845
Significant Observable Inputs (Level 2) [Member] \| Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	6,270	10,118
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	1,122,837	1,203,785
Other assets	70,430	7,991
Total assets	1,193,267	1,211,776
Other liabilities	85	1,068
1Total liabilities	85	1,068
Significant Unobservable Inputs (Level 3) [Member] \| Privately issued residential [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	1,055,068	1,136,256
Significant Unobservable Inputs (Level 3) [Member] \| Privately issued commercial [Member] \| Mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	10,568	15,029
Significant Unobservable Inputs (Level 3) [Member] \| Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	$ 57,201	$ 52,500

Fair value measurements - Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance of other assets and other liabilities	$ 34,051,000	$ 13,171,000	$ 6,923,000	$ 2,244,000
Total gains (losses) realized/unrealized:
Included in earnings of other assets and other liabilities	84,864,000	13,565,000	157,381,000	56,809,000
Transfer in and/or out of Level 3 of other assets and other liabilities	(48,570,000)	(18,799,000)	(93,959,000)	(51,116,000)
Ending Balance of other assets and other liabilities	70,345,000	7,937,000	70,345,000	7,937,000
Ending Balance	1,193,182		1,193,182
Changes in unrealized gains (losses) included in earnings related to assets still held at end of period	63,357,000	5,926,000	70,187,000	7,932,000
Privately issued residential [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,068,392,000	1,306,202,000	1,136,256,000	1,435,561,000
Total gains (losses) realized/unrealized:
Included in earnings	(5,672,000)	(9,642,000)	(27,976,000)	(41,713,000)
Included in other comprehensive income	39,963,000	(4,030,000)	87,646,000	95,526,000
Settlements	(47,615,000)	(77,452,000)	(140,858,000)	(274,296,000)
Transfers in and/or out of Level 3
Ending Balance	1,055,068,000	1,215,078,000	1,055,068,000	1,215,078,000
Changes in unrealized gains (losses) included in earnings related to assets still held at end of period	(5,672,000)	(9,642,000)	(27,976,000)	(41,713,000)
Privately issued commercial [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	12,127,000	17,233,000	15,029,000	22,407,000
Total gains (losses) realized/unrealized:
Included in other comprehensive income	640,000	1,581,000	1,751,000	99,000
Settlements	(2,199,000)	(1,985,000)	(6,212,000)	(5,677,000)
Transfers in and/or out of Level 3
Ending Balance	10,568,000	16,829,000	10,568,000	16,829,000
Collateralized debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	55,098,000	61,601,000	52,500,000	110,756,000
Total gains (losses) realized/unrealized:
Included in other comprehensive income	3,297,000	(9,482,000)	7,008,000	(2,276,000)
Purchases				50,790,000
Sales				(105,643,000)
Settlements	(1,194,000)	(765,000)	(2,307,000)	(2,273,000)
Transfers in and/or out of Level 3
Ending Balance	$ 57,201,000	$ 51,354,000	$ 57,201,000	$ 51,354,000

Fair value measurements - Quantitative Information Related to Significant Unobservable Inputs (Detail)	9 Months Ended
	Sep. 30, 2012 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments	$ 1,193,182
Privately issued residential [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments	$ 1,065,636
Valuation technique	Discounted cash flow
Unobservable inputs/ assumptions	Probability of default Loss severity
Probability of default weighted average	18.00%
Loss severity weighted average	49.00%
Privately issued residential [Member] \| Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Probability of default Loss	1.00%
Loss severity	32.00%
Privately issued residential [Member] \| Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Probability of default Loss	40.00%
Loss severity	79.00%
Collateralized debt obligations [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments	$ 57,201
Valuation technique	Discounted cash flow
Unobservable inputs/ assumptions	Probability of default Loss severity
Probability of default weighted average	15.00%
Collateralized debt obligations [Member] \| Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Probability of default Loss	3.00%
Loss severity	100.00%
Collateralized debt obligations [Member] \| Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Probability of default Loss	65.00%
Commitments to originate real estate loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments	$ 70,345
Valuation technique	Discounted cash flow
Unobservable inputs/ assumptions	Commitment expirations
Commitment expirations weighted average	22.00%
Commitments to originate real estate loans [Member] \| Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Commitment expirations	0.00%
Commitments to originate real estate loans [Member] \| Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Commitment expirations	73.00%

Fair value measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Financial assets:
Cash and cash equivalents	$ 1,622,928	$ 1,452,397	$ 1,354,057	$ 933,755
Interest-bearing deposits at banks	411,994	154,960
Trading account assets	526,844	561,834
Investment securities	6,624,004	7,673,154
Loans and leases:
Allowance for credit losses	(921,223)	(908,290)
Loans and leases, net	63,190,732	59,187,715
Financial liabilities:
Noninterest-bearing deposits	(22,968,401)	(20,017,883)
Time deposits	(4,972,409)	(6,107,530)
Deposits at Cayman Islands office	(1,402,753)	(355,927)
Long-term borrowings	(4,969,536)	(6,686,226)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,548,290
Trading account assets	55,391
Investment securities	106,789
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	74,638
Interest-bearing deposits at banks	411,994
Trading account assets	471,453
Investment securities	5,192,015
Loans and leases:
Commercial real estate loans	175,518
Residential real estate loans	7,727,137
Loans and leases, net	7,902,655
Accrued interest receivable	244,021
Financial liabilities:
Noninterest-bearing deposits	(22,968,401)
Savings deposits and NOW accounts	(34,663,695)
Time deposits	(4,999,049)
Deposits at Cayman Islands office	(1,402,753)
Short-term borrowings	(592,154)
Long-term borrowings	(5,090,619)
Accrued interest payable	(78,591)
Trading account liabilities	(424,312)
Other financial instruments:
Commitments to sell real estate loans	(36,809)
Interest rate swap agreements used for interest rate risk management	153,220
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	1,278,646
Loans and leases:
Commercial loans and leases	16,482,866
Commercial real estate loans	24,527,925
Residential real estate loans	3,265,181
Consumer loans	11,512,448
Loans and leases, net	55,788,420
Other financial instruments:
Commitments to originate real estate loans for sale	70,345
Other credit-related commitments	(112,713)
Carrying amount [Member]
Financial assets:
Cash and cash equivalents	1,622,928	1,452,397
Interest-bearing deposits at banks	411,994	154,960
Trading account assets	526,844	561,834
Investment securities	6,624,004	7,673,154
Loans and leases:
Commercial loans and leases	16,704,575	15,734,436
Commercial real estate loans	24,970,416	24,411,114
Residential real estate loans	10,808,220	7,923,165
Consumer loans	11,628,744	12,027,290
Allowance for credit losses	(921,223)	(908,290)
Loans and leases, net	63,190,732	59,187,715
Accrued interest receivable	244,021	222,618
Financial liabilities:
Noninterest-bearing deposits	(22,968,401)	(20,017,883)
Savings deposits and NOW accounts	(34,663,695)	(32,913,309)
Time deposits	(4,972,409)	(6,107,530)
Deposits at Cayman Islands office	(1,402,753)	(355,927)
Short-term borrowings	(592,154)	(782,082)
Long-term borrowings	(4,969,536)	(6,686,226)
Accrued interest payable	(78,591)	(67,900)
Trading account liabilities	(424,312)	(434,559)
Other financial instruments:
Commitments to originate real estate loans for sale	70,345	6,923
Commitments to sell real estate loans	(36,809)	(3,498)
Other credit-related commitments	(112,713)	(109,828)
Interest rate swap agreements used for interest rate risk management	153,220	147,302
Estimate fair value [Member]
Financial assets:
Cash and cash equivalents	1,622,928	1,452,397
Interest-bearing deposits at banks	411,994	154,960
Trading account assets	526,844	561,834
Investment securities	6,577,450	7,608,008
Loans and leases:
Commercial loans and leases	16,482,866	15,507,342
Commercial real estate loans	24,703,443	24,024,585
Residential real estate loans	10,992,318	7,782,935
Consumer loans	11,512,448	11,869,813
Loans and leases, net	63,691,075	59,184,675
Accrued interest receivable	244,021	222,618
Financial liabilities:
Noninterest-bearing deposits	(22,968,401)	(20,017,883)
Savings deposits and NOW accounts	(34,663,695)	(32,913,309)
Time deposits	(4,999,049)	(6,133,806)
Deposits at Cayman Islands office	(1,402,753)	(355,927)
Short-term borrowings	(592,154)	(782,082)
Long-term borrowings	(5,090,619)	(6,720,174)
Accrued interest payable	(78,591)	(67,900)
Trading account liabilities	(424,312)	(434,559)
Other financial instruments:
Commitments to originate real estate loans for sale	70,345	6,923
Commitments to sell real estate loans	(36,809)	(3,498)
Other credit-related commitments	(112,713)	(109,828)
Interest rate swap agreements used for interest rate risk management	$ 153,220	$ 147,302

Commitments and contingencies - Company's Significant Commitments (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Commitments to extend credit
Home equity lines of credit	$ 6,319,441	$ 6,393,332
Commercial real estate loans to be sold	282,162	177,982
Other commercial real estate and construction	3,578,153	2,818,071
Residential real estate loans to be sold	1,645,005	182,474
Other residential real estate	475,989	129,466
Commercial and other	10,315,662	10,442,754
Standby letters of credit	3,920,218	3,930,271
Commercial letters of credit	46,188	44,981
Financial guarantees and indemnification contracts	1,994,704	1,903,254
Commitments to sell real estate loans	$ 2,337,536	$ 635,899

Commitments and contingencies - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2012	Dec. 31, 2011
Significant Commitments [Line Items]
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program	$ 1,900	$ 1,800
Outstanding loan principal balances reinsured	68
Assets of subsidiaries providing reinsurance to satisfy claims	41
Range of reasonably possible losses, minimum	0
Range of reasonably possible losses, maximum	40
2011 - 2013 [Member]
Significant Commitments [Line Items]
Naming rights of football stadium per year	5
2014 - 2017 [Member]
Significant Commitments [Line Items]
Naming rights of football stadium per year	$ 6

Segment information - Information about Company's Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating Statistics [Line Items]
Total Revenue	$ 1,108,455	$ 985,101	$ 3,145,200	$ 2,956,183
Net income (loss)	293,462	183,108	733,305	711,739
Business Banking [Member]
Operating Statistics [Line Items]
Total Revenue	114,181	110,627	335,475	314,416
Inter-segment revenues	1,011	957	3,202	2,890
Net income (loss)	38,411	31,237	110,829	84,121
Commercial Banking [Member]
Operating Statistics [Line Items]
Total Revenue	255,498	230,023	741,714	672,199
Inter-segment revenues	1,561	1,318	4,832	3,674
Net income (loss)	112,654	93,783	315,373	277,225
Commercial Real Estate [Member]
Operating Statistics [Line Items]
Total Revenue	169,806	152,878	491,433	412,250
Inter-segment revenues	5,031	410	5,860	1,214
Net income (loss)	75,896	65,566	225,025	179,634
Discretionary Portfolio [Member]
Operating Statistics [Line Items]
Total Revenue	1,805	16,437	(11,162)	171,303
Inter-segment revenues	(25,593)	(3,968)		(16,174)
Net income (loss)	(5,039)	2,077		76,566
Residential Mortgage Banking [Member]
Operating Statistics [Line Items]
Total Revenue	138,662	67,757	341,699	183,910
Inter-segment revenues	28,454	25,012	100,350	44,018
Net income (loss)	44,727	10,805	94,238	21,556
Retail Banking [Member]
Operating Statistics [Line Items]
Total Revenue	318,567	314,113	939,409	920,645
Inter-segment revenues	2,841	2,583	8,931	8,537
Net income (loss)	58,441	43,947	165,289	151,318
All Other [Member]
Operating Statistics [Line Items]
Total Revenue	109,936	93,266	$ 306,632	281,460
Inter-segment revenues	(13,305)	(26,312)		(44,159)
Net income (loss)	$ (31,628)	$ (64,307)		$ (78,681)

Segment information - Summary of Segment Information (Detail) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	$ 79,518	$ 72,489	$ 73,977
Business Banking [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	4,918	4,995	5,192
Commercial Banking [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	19,691	17,397	17,650
Commercial Real Estate [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	16,364	14,730	15,025
Discretionary Portfolio [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	16,428	13,844	14,170
Residential Mortgage Banking [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	2,316	1,913	1,958
Retail Banking [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	11,746	11,904	11,940
All Other [Member]
Operating Statistics [Line Items]
Segment Reporting Information Average Asset	$ 8,055	$ 7,706	$ 8,042

Segment information - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Operating Statistics [Line Items]
Taxable equivalent adjustment	$ 6,534,000	$ 6,546,000	$ 19,884,000	$ 19,341,000

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings LP - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Schedule Of Equity Method Investments Joint Ventures [Line Items]
Minority interest in Bayview Lending Group LLC			20.00%
Carrying value of minority interest investment in Bayview Lending Group LLC	$ 98		$ 98
Outstanding principal balances of commercial mortgage servicing rights obtained from Bayview Financial	4,000		4,000		$ 4,400
Amounts recorded as capitalized servicing assets for commercial mortgage loans	10		10		16
Servicing rights purchased from Bayview Financial related to residential mortgage loans	2		2		5
Outstanding principal balances of residential mortgage loans from Bayview Financial	2,800		2,800		3,100
Revenues earned for sub-servicing loans	9	$ 10	27	$ 31
Collateralized mortgage obligations in available-for-sale investment securities portfolio securitized by Bayview Financial	11		11		15
Investment securities in held-to-maturity portfolio securitized by Bayview Financial	248		248		269
Bayview and Colonial [Member]
Schedule Of Equity Method Investments Joint Ventures [Line Items]
Outstanding principal balances of residential mortgage loans from Bayview Financial	11,700		11,700		$ 13,100
Revenues earned for sub-servicing loans	$ 2		$ 7

Loans and leases and the allowance for credit losses - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012 USD ($) Modification	Sep. 30, 2011 USD ($) Modification	Sep. 30, 2012 USD ($) Modification	Sep. 30, 2011 USD ($) Modification
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	409	404	1,238	1,347
Pre-modification Recorded Investment	$ 55,191	$ 21,688	$ 171,503	$ 211,291
Post-modification Recorded Investment	53,591	21,676	168,746	202,956
Financial effects of modification recorded investment	(1,600)	(12)	(2,757)	(8,335)
Financial effects of modification interest	$ (790)	$ (681)	$ (1,983)	$ (3,063)
Principal deferral [Member] \| Commercial, financial, leasing, etc [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	21	13	39	46
Pre-modification Recorded Investment	$ 7,823	$ 1,021	$ 21,027	$ 8,302
Post-modification Recorded Investment	7,653	1,115	19,668	8,396
Financial effects of modification recorded investment	$ (170)	$ 94	$ (1,359)	$ 94
Principal deferral [Member] \| Commercial real estate loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	8	6	11	24
Pre-modification Recorded Investment	$ 5,951	$ 1,361	$ 10,387	$ 13,212
Post-modification Recorded Investment	6,238	1,301	10,642	13,041
Financial effects of modification recorded investment	$ 287	$ (60)	$ 255	$ (171)
Principal deferral [Member] \| Residential builder and developer [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	11		19	4
Pre-modification Recorded Investment	$ 17,383		$ 26,708	$ 18,586
Post-modification Recorded Investment	16,275		24,812	17,661
Financial effects of modification recorded investment	$ (1,108)		$ (1,896)	$ (925)
Principal deferral [Member] \| Other commercial construction [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	2	2	5	3
Pre-modification Recorded Investment	$ 5,429	$ 6,161	$ 66,317	$ 8,436
Post-modification Recorded Investment	4,702	6,284	65,600	8,553
Financial effects of modification recorded investment	$ (727)	$ 123	$ (717)	$ 117
Principal deferral [Member] \| Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	5	12	27	24
Pre-modification Recorded Investment	$ 738	$ 2,099	$ 3,302	$ 2,869
Post-modification Recorded Investment	772	2,124	3,447	2,884
Financial effects of modification recorded investment	$ 34	$ 25	$ 145	$ 15
Principal deferral [Member] \| Residential Alt-A [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	1	1	5	2
Pre-modification Recorded Investment	$ 218	$ 532	$ 768	$ 605
Post-modification Recorded Investment	220	562	785	638
Financial effects of modification recorded investment	$ 2	$ 30	$ 17	$ 33
Principal deferral [Member] \| Home equity lines and loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	5	1	15	2
Pre-modification Recorded Investment	$ 434	$ 50	$ 1,285	$ 119
Post-modification Recorded Investment	$ 434	$ 50	$ 1,285	$ 119
Principal deferral [Member] \| Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	135	159	484	580
Pre-modification Recorded Investment	$ 1,721	$ 1,655	$ 6,306	$ 7,993
Post-modification Recorded Investment	$ 1,721	$ 1,655	$ 6,306	$ 7,993
Principal deferral [Member] \| Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	14	7	73	20
Pre-modification Recorded Investment	$ 336	$ 186	$ 1,117	$ 348
Post-modification Recorded Investment	$ 336	$ 186	$ 1,117	$ 348
Combination of concession types [Member] \| Commercial, financial, leasing, etc [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	2		3	1
Pre-modification Recorded Investment	$ 327		$ 372	$ 1,945
Post-modification Recorded Investment	322		366	1,945
Financial effects of modification recorded investment	(5)		(6)
Financial effects of modification interest	$ (39)		$ (72)	$ (641)
Combination of concession types [Member] \| Commercial real estate loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	1		5
Pre-modification Recorded Investment	$ 214		$ 1,424
Post-modification Recorded Investment	214		1,445
Financial effects of modification recorded investment			21
Financial effects of modification interest	$ (49)		$ (305)
Combination of concession types [Member] \| Residential builder and developer [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	1		3	1
Pre-modification Recorded Investment	$ 2,486		$ 4,836	$ 798
Post-modification Recorded Investment	$ 2,486		5,212	790
Financial effects of modification recorded investment			$ 376	$ (8)
Combination of concession types [Member] \| Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	18	22	47	81
Pre-modification Recorded Investment	$ 5,490	$ 2,972	$ 10,475	$ 16,066
Post-modification Recorded Investment	5,553	3,044	10,658	16,385
Financial effects of modification recorded investment	63	72	183	319
Financial effects of modification interest	$ (150)	$ (51)	$ (415)	$ (864)
Combination of concession types [Member] \| Residential Alt-A [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	13	8	28	23
Pre-modification Recorded Investment	$ 2,771	$ 1,393	$ 5,640	$ 4,255
Post-modification Recorded Investment	2,795	1,446	5,732	4,362
Financial effects of modification recorded investment	$ 24	53	92	107
Financial effects of modification interest		$ (341)	$ (49)	$ (572)
Combination of concession types [Member] \| Home equity lines and loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	11	9	17	19
Pre-modification Recorded Investment	$ 976	$ 696	$ 1,691	$ 1,484
Post-modification Recorded Investment	976	697	1,691	1,486
Financial effects of modification recorded investment		1		2
Financial effects of modification interest	$ (125)	$ (157)	$ (272)	$ (272)
Combination of concession types [Member] \| Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	109	96	298	318
Pre-modification Recorded Investment	$ 2,329	$ 1,049	$ 5,108	$ 5,049
Post-modification Recorded Investment	2,329	1,049	5,108	5,049
Financial effects of modification interest	$ (319)	$ (57)	$ (601)	$ (556)
Combination of concession types [Member] \| Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	22	31	74	77
Pre-modification Recorded Investment	$ 339	$ 263	$ 700	$ 482
Post-modification Recorded Investment	339	263	700	482
Financial effects of modification interest	$ (97)	$ (63)	$ (155)	$ (75)
Interest rate reduction [Member] \| Commercial real estate loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification			1
Pre-modification Recorded Investment			$ 383
Post-modification Recorded Investment			430
Financial effects of modification recorded investment			47
Financial effects of modification interest			$ (89)
Interest rate reduction [Member] \| Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification		1		12
Pre-modification Recorded Investment		$ 86		$ 1,764
Post-modification Recorded Investment		86		1,804
Financial effects of modification recorded investment				40
Financial effects of modification interest		$ (7)		$ (70)
Interest rate reduction [Member] \| Home equity lines and loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification			1
Pre-modification Recorded Investment			$ 144
Post-modification Recorded Investment			144
Financial effects of modification interest			$ (6)
Interest rate reduction [Member] \| Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	9	6	16	17
Pre-modification Recorded Investment	$ 157	$ 52	$ 234	$ 183
Post-modification Recorded Investment	157	52	234	183
Financial effects of modification interest	$ (11)	$ (4)	$ (16)	$ (12)
Interest rate reduction [Member] \| Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification		1	3	1
Pre-modification Recorded Investment		$ 9	$ 23	$ 9
Post-modification Recorded Investment		9	23	9
Financial effects of modification interest		$ (1)	$ (3)	$ (1)
Other [Member] \| Commercial, financial, leasing, etc [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification			3
Pre-modification Recorded Investment			$ 2,967
Post-modification Recorded Investment			3,052
Financial effects of modification recorded investment			$ 85
Other [Member] \| Residential builder and developer [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification		1		6
Pre-modification Recorded Investment		$ 1,700		$ 118,114
Post-modification Recorded Investment		1,350		110,156
Financial effects of modification recorded investment		$ (350)		$ (7,958)
Other [Member] \| Home equity lines and loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification		1		1
Pre-modification Recorded Investment		$ 43		$ 43
Post-modification Recorded Investment		$ 43		$ 43
Other [Member] \| Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	20	26	51	83
Pre-modification Recorded Investment	$ 68	$ 279	$ 239	$ 537
Post-modification Recorded Investment	$ 68	$ 279	$ 239	$ 537
Other [Member] \| Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	1	1	10	2
Pre-modification Recorded Investment	$ 1	$ 81	$ 50	$ 92
Post-modification Recorded Investment	$ 1	$ 81	$ 50	$ 92