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Allowance for Credit Losses [Abstract]

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, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	73,395		2,216		46	$	75,565
Obligations of states and political subdivisions		63,528		866		42		64,352
Mortgage-backed securities:
Government issued or guaranteed		3,391,427		183,529		58		3,574,898
Privately issued residential		1,769,795		12,736		259,163		1,523,368
Privately issued commercial		28,116		—		4,636		23,480
Collateralized debt obligations		96,130		22,972		9,760		109,342
Other debt securities		309,095		27,325		42,456		293,964
Equity securities		120,828		5,433		7,734		118,527

		5,852,314		255,077		323,895		5,783,496

Investment securities held to maturity:
Obligations of states and political subdivisions		204,599		6,856		33		211,422
Mortgage-backed securities:
Government issued or guaranteed		884,445		27,531		—		911,976
Privately issued		324,513		—		122,027		202,486
Other debt securities		12,160		—		—		12,160

		1,425,717		34,387		122,060		1,338,044

Other securities		453,502		—		—		453,502

Total	$	7,731,533		289,464		445,955	$	7,575,042


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

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

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

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

Other securities		508,624		—		—		508,624

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

Gross realized gains and losses from sales of investment securities were not significant during the three- and nine-month periods ended September 30, 2010 and 2009. The Company recognized $10 million and $59 million of pre-tax other-than-temporary impairment losses during the three and nine months ended September 30, 2010, respectively. Approximately $12 million of the losses recognized in the second quarter of 2010 related to American Depositary Shares (“ADSs”) of Allied Irish Banks, p.l.c. (“AIB”) which were obtained in M&T’s acquisition of Allfirst Financial Inc. in 2003. The remaining losses in 2010 related to certain privately issued residential mortgage-backed securities and collateralized debt obligations backed by pooled trust preferred securities. The impairment charges related to the AIB ADSs were recognized due to mounting credit and other losses incurred by AIB and significant dilution of AIB common shareholders based on the Irish government’s significant ownership position. Other-than-temporary impairment losses on investment securities of $47 million and $104 million (pre-tax) were recognized by the Company for the three and nine months ended September 30, 2009 and related primarily to privately issued residential mortgage-backed securities. The impairment charges related to the privately issued residential mortgage-backed securities in the 2010 and 2009 periods were recognized in light of deterioration of housing values in the residential real estate market and a rise in delinquencies and charge-offs of underlying mortgage loans collateralizing those securities. The impairment charges related to the collateralized debt obligations in the 2010 periods were recognized after evaluating the expected repayment performance of financial institutions where trust preferred securities were within the collateralized debt obligations obtained in acquisitions. The other-than-temporary impairment losses represent management’s estimate of credit losses inherent in the securities considering projected cash flows using assumptions of delinquency rates, loss severities, and other estimates of future collateral performance. The following table displays changes in credit losses for debt securities recognized in earnings for the three and nine months ended September 30, 2010 and 2009.


	Three months ended September 30
	2010			2009
	(in thousands)
Beginning balance	$	314,263			205,918
Additions for credit losses not previously recognized		9,532			47,033
Reductions for increases in cash flows		(108	)		(254	)
Reductions for realized losses		(11,812	)		(425	)


Ending balance	$	311,875			252,272


	Nine months ended September 30
	2010			2009
	(in thousands)
Beginning balance	$	284,513			155,967
Additions for credit losses not previously recognized		46,721			104,001
Reductions for increases in cash flows		(450	)		(1,201	)
Reductions for realized losses		(18,909	)		(6,495	)


Ending balance	$	311,875			252,272

At September 30, 2010, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:


	Amortized		Estimated
	cost		fair value
	(in thousands)
Debt securities available for sale:
Due in one year or less	$	48,926		49,213
Due after one year through five years		55,277		57,558
Due after five years through ten years		27,647		30,012
Due after ten years		410,298		406,440

		542,148		543,223
Mortgage-backed securities available for sale		5,189,338		5,121,746

	$	5,731,486		5,664,969

Debt securities held to maturity:
Due in one year or less	$	40,961		41,191
Due after one year through five years		10,864		11,417
Due after five years through ten years		130,978		136,206
Due after ten years		33,956		34,768

		216,759		223,582
Mortgage-backed securities held to maturity		1,208,958		1,114,462

	$	1,425,717		1,338,044

A summary of investment securities that as of September 30, 2010 and December 31, 2009 had been in a continuous unrealized loss position for less than twelve months and those that had been in a continuous unrealized loss position for twelve months or longer follows:


	Less than 12 months					12 months or more
			Unrealized					Unrealized
	Fair value		losses			Fair value		losses
	(in thousands)
September 30, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	2,017		(46	)		—		—
Obligations of states and political subdivisions		2,057		(7	)		3,210		(35	)
Mortgage-backed securities:
Government issued or guaranteed		4,028		(34	)		2,581		(24	)
Privately issued residential		162,633		(1,981	)		1,143,110		(257,182	)
Privately issued commercial		—		—			23,480		(4,636	)
Collateralized debt obligations		19,532		(9,464	)		3,593		(296	)
Other debt securities		924		(1	)		86,574		(42,455	)
Equity securities		5,488		(3,559	)		1,219		(4,175	)

		196,679		(15,092	)		1,263,767		(308,803	)


Investment securities held to maturity:
Obligations of states and political subdivisions		1,741		(6	)		700		(27	)
Privately issued mortgage-backed securities		—		—			202,486		(122,027	)

		1,741		(6	)		203,186		(122,054	)

Total	$	198,420		(15,098	)		1,466,953		(430,857	)


	Less than 12 months					12 months or more
			Unrealized					Unrealized
	Fair value		losses			Fair value		losses
	(in thousands)
December 31, 2009
Investment securities available for sale:
U.S. Treasury and federal agencies	$	6,265		(53	)		572		(4	)
Obligations of states and political subdivisions		9,540		(83	)		3,578		(45	)
Mortgage-backed securities:
Government issued or guaranteed		685,319		(6,460	)		19,379		(307	)
Privately issued residential		98,312		(2,871	)		1,504,020		(380,208	)
Privately issued commercial		—		—			25,166		(7,967	)
Collateralized debt obligations		13,046		(10,218	)		3,598		(984	)
Other debt securities		5,786		(174	)		138,705		(57,990	)
Equity securities		7,449		(1,728	)		23,159		(13,977	)

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


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

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

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

The Company owned 327 individual investment securities with aggregate gross unrealized losses of $446 million at September 30, 2010. Approximately $381 million of the unrealized losses pertained to privately issued residential mortgage-backed securities with a cost basis of $1.9 billion. The Company also had $52 million of unrealized losses on trust preferred securities issued by financial institutions and securities backed by trust preferred securities issued by financial institutions and other entities having a cost basis of $156 million. Based on a review of each of the securities in the investment securities portfolio at September 30, 2010, with the exception of the aforementioned securities for which other-than-temporary impairment losses were recognized, the Company concluded that it expected to recover the amortized cost basis of its investment. As of September 30, 2010, the Company does not intend to sell nor is it anticipated that it would be required to sell any of its impaired investment securities. At September 30, 2010, the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $454 million of cost method investment securities.

Allowance For Credit Losses

9 Months Ended

Sep. 30, 2010

Pension plans and other postretirement benefits [Abstract]

4. Allowance for credit losses

Changes in the allowance for credit losses were as follows:


	Three months ended						Nine months ended
	September 30						September 30
	2010			2009			2010			2009
	(in thousands)
Beginning balance	$	894,667			855,365			878,022			787,904
Provision for credit losses		93,000			154,000			283,000			459,000
Consolidation of loan securitization trusts		—			—			2,752			—
Net charge-offs
Charge-offs		(101,782	)		(150,150	)		(313,167	)		(409,169	)
Recoveries		8,835			8,659			44,113			30,139

Net charge-offs		(92,947	)		(141,491	)		(269,054	)		(379,030	)


Ending balance	$	894,720			867,874			894,720			867,874

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

The recorded investment in loans considered impaired for purposes of applying GAAP was $1.1 billion and $1.3 billion at September 30, 2010 and December 31, 2009, respectively. The recorded investment in loans considered impaired for which there was a related valuation allowance for impairment included in the allowance for credit losses and the amount of such impairment allowance were $827 million and $214 million, respectively, at September 30, 2010 and $1.1 billion and $244 million, respectively, at December 31, 2009. The recorded investment in loans considered impaired for which there was no related valuation allowance for impairment was $300 million and $234 million at September 30, 2010 and December 31, 2009, respectively.

Borrowings	9 Months Ended
Borrowings	Sep. 30, 2010
Borrowings [Abstract]
Borrowings	5. Borrowings The Company had $1.2 billion of fixed and floating rate junior subordinated deferrable interest debentures (“Junior Subordinated Debentures”) outstanding at September 30, 2010 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. One of its provisions is for a three-year phase-in related to the exclusion of trust preferred capital securities from Tier 1 capital for large financial institutions, including M&T. That phase-in period begins on January 1, 2013. 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 purchase 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, 2010 and December 31, 2009.

Stockholders equity

9 Months Ended

Sep. 30, 2010

Stockholders' equity [Abstract]

Stockholders' equity

6. Stockholders’ 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:

Carrying

issued and

value

outstanding

September 30, 2010

December 31, 2009

(dollars in thousands)

Series A (a)

Fixed Rate Cumulative Perpetual Preferred Stock, Series A, $1,000 liquidation preference per share, 600,000 shares authorized

600,000

577,082

572,580

Series B (b)

Series B Mandatory Convertible Non-cumulative Preferred Stock, $1,000 liquidation preference per share, 26,500 shares authorized

26,500

Series C (a)(c)

Fixed Rate Cumulative Perpetual Preferred Stock, Series C, $1,000 liquidation preference per share, 151,500 shares authorized

151,500

134,397

131,155


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

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

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

Pension plans and other postretirement benefits

9 Months Ended

Sep. 30, 2010

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:


							Other
	Pension						postretirement
	benefits						benefits
	Three months ended September 30
	2010			2009			2010			2009
	(in thousands)
Service cost	$	4,918			4,935			101			88
Interest cost on projected benefit obligation		12,031			11,910			782			828
Expected return on plan assets		(12,722	)		(11,963	)		—			—
Amortization of prior service cost		(1,640	)		(1,640	)		44			61
Amortization of net actuarial loss		3,388			2,424			(2	)		(5	)


Net periodic benefit cost	$	5,975			5,666			925			972


							Other
	Pension						postretirement
	benefits						benefits
	Nine months ended September 30
	2010			2009			2010			2009
	(in thousands)
Service cost	$	14,753			14,548			303			265
Interest cost on projected benefit obligation		36,092			34,189			2,347			2,475
Expected return on plan assets		(38,165	)		(35,014	)		—			—
Amortization of prior service cost		(4,919	)		(4,919	)		132			182
Amortization of net actuarial loss		10,164			7,273			(7	)		(15	)


Net periodic benefit cost	$	17,925			16,077			2,775			2,907

Expense incurred in connection with the Company’s defined contribution pension and retirement savings plans totaled $9,461,000 and $8,061,000 for the three months ended September 30, 2010 and 2009, respectively, and $29,926,000 and $27,166,000 for the nine months ended September 30, 2010 and 2009, respectively.

Earnings per common share

9 Months Ended

Sep. 30, 2010

Earnings per common share [Abstract]

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
	2010			2009			2010			2009
	(in thousands, except per share)
Income available to common stockholders:

Net income	$	192,015			127,664			531,719			243,073
Less: Preferred stock dividends(a)		(10,056	)		(10,056	)		(30,169	)		(26,024	)
Amortization of preferred stock discount(a)		(2,653	)		(2,465	)		(7,815	)		(5,620	)

Net income available to common equity		179,306			115,143			493,735			211,429

Less: Income attributable to unvested stock-based compensation awards		(2,526	)		(1,249	)		(6,924	)		(2,367	)


Net income available to common stockholders	$	176,780			113,894			486,811			209,062

Weighted-average shares outstanding:

Common shares outstanding (including common stock issuable) and unvested stock- based compensation awards		120,010			118,663			119,705			114,843
Less: Unvested stock-based compensation awards		(1,690	)		(1,293	)		(1,657	)		(1,142	)


Weighted-average shares outstanding		118,320			117,370			118,048			113,701

Basic earnings per common share	$	1.49			.97			4.12			1.84


(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
	2010			2009			2010			2009
	(in thousands, except per share)
Net income available to common equity	$	179,306			115,143			493,735			211,429

Less: Income attributable to unvested stock-based compensation awards		(2,517	)		(1,249	)		(6,904	)		(2,367	)


Net income available to common stockholders	$	176,789			113,894			486,831			209,062

Adjusted weighted-average shares outstanding:

Common and unvested stock-based compensation awards		120,010			118,663			119,705			114,843
Less: Unvested stock-based compensation awards		(1,690	)		(1,293	)		(1,657	)		(1,142	)
Plus: Incremental shares from assumed conversion of stock- based compensation awards and convertible preferred stock		835			177			718			99


Adjusted weighted-average shares outstanding		119,155			117,547			118,766			113,800

Diluted earnings per common share	$	1.48			.97			4.10			1.84

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. During the nine-month periods ended September 30, 2010 and 2009, the Company issued stock-based compensation awards in the form of restricted stock and restricted stock units, which, in accordance with GAAP, are considered participating securities.

Stock-based compensation awards, warrants to purchase common stock of M&T and preferred stock convertible into shares of M&T stock representing approximately 10.7 million and 15.1 million common shares during the three-month periods ended September 30, 2010 and 2009, respectively, and 11.1 million and 15.1 million common shares during the nine-month periods ended September 30, 2010 and 2009, 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, 2010

Comprehensive income [Abstract]

Comprehensive income

9. Comprehensive income

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


	Nine months ended September 30, 2010
	Before-tax			Income
	amount			taxes			Net
	(in thousands)
Unrealized gains (losses) on investment securities:

Available for sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):

Securities with OTTI charges during the period	$	(67,052	)		26,074			(40,978	)
Less: OTTI charges recognized in net income		(58,714	)		22,758			(35,956	)

Net unrealized losses on investment securities with OTTI		(8,338	)		3,316			(5,022	)


AFS investment securities — all other:

Unrealized holding gains during period		166,122			(64,944	)		101,178
Less: Reclassification adjustment for gains recognized in net income		1,023			(392	)		631
Less: Securities with OTTI charges during the period		(67,052	)		26,074			(40,978	)

		232,151			(90,626	)		141,525

Reclassification of unrealized holding losses to income during period on investment securities previously transferred from AFS to held to maturity (“HTM”)		6,400			(2,511	)		3,889


Net unrealized gains on investment securities		230,213			(89,821	)		140,392

Reclassification for amortization of gains on terminated cash flow hedges to income		(336	)		125			(211	)

Defined benefit plans liability adjustment		5,370			(2,108	)		3,262


	$	235,247			(91,804	)		143,443


	Nine months ended September 30, 2009
	Before-tax			Income
	amount			taxes			Net
	(in thousands)
Unrealized gains (losses) on investment securities:

AFS investment securities with OTTI:

Securities with OTTI charges during the period	$	(202,737	)		79,296			(123,441	)
Less: OTTI charges recognized in net income		(104,001	)		40,662			(63,339	)

Net unrealized losses on investment securities with OTTI		(98,736	)		38,634			(60,102	)


AFS investment securities — all other:

Unrealized holding gains during period		389,609			(149,651	)		239,958
Less: Reclassification adjustment for losses realized in net income		(135	)		54			(81	)
Less: Securities with OTTI charges during the period		(202,737	)		79,296			(123,441	)

		592,481			(229,001	)		363,480

Reclassification of unrealized holding losses to income during period on investment securities previously transferred from AFS to HTM		7,955			(2,183	)		5,772


Net unrealized gains on investment securities		501,700			(192,550	)		309,150

Reclassification for amortization of losses on terminated cash flow hedges to income		10,873			(4,246	)		6,627

Defined benefit plans liability adjustment		2,521			(703	)		1,818


	$	515,094			(197,499	)		317,595

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


							Cash			Defined
	Investment securities						flow			benefit
	With OTTI			All other			hedges			plans			Total
	(in thousands)
Balance — January 1, 2010	$	(76,772	)		(142,853	)		674			(117,046	)		(335,997	)

Net gain (loss) during period		(5,022	)		145,414			(211	)		3,262			143,443


Balance — September 30, 2010	$	(81,794	)		2,561			463			(113,784	)		(192,554	)


Balance — January 1, 2009	$	—			(556,668	)		(5,883	)		(174,330	)		(736,881	)

Net gain (loss) during period		(60,102	)		369,252			6,627			1,818			317,595


Balance — September 30, 2009	$	(60,102	)		(187,416	)		744			(172,512	)		(419,286	)

Derivative financial instruments

9 Months Ended

Sep. 30, 2010

Derivative financial instruments [Abstract]

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, 2010.

The net effect of interest rate swap agreements was to increase net interest income by $10 million for each of the three-month periods ended September 30, 2010 and 2009, and $32 million and $27 million for the nine months ended September 30, 2010 and 2009, 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, 2010
Fair value hedges:
Fixed rate long-term borrowings (a)	$	1,037,241		5.7		6.33	%		2.18	%


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

	$	1,062,241		6.4		6.30	%		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 $12.6 billion and $13.9 billion at September 30, 2010 and December 31, 2009, respectively. The notional amounts of foreign currency and other option and futures contracts entered into for trading purposes aggregated $622 million and $608 million at September 30, 2010 and December 31, 2009, respectively.

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


	Asset derivatives				Liability derivatives
	Fair value				Fair value
	September 30,		December 31,		September 30,		December 31,
	2010		2009		2010		2009
	(in thousands)
Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements (a)	$	139,718		54,486	$	—		—
Commitments to sell real estate loans (a)		406		6,009		2,945		171

		140,124		60,495		2,945		171

Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale (a)		26,554		4,428		137		4,508
Commitments to sell real estate loans (a)		721		13,293		8,906		1,360
Trading:
Interest rate contracts (b)		439,386		317,651		415,741		290,104
Foreign exchange and other option and futures contracts (b)		8,582		11,908		9,343		12,094

		475,243		347,280		434,127		308,066


Total derivatives	$	615,367		407,775	$	437,072		308,237


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

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


	Amount of unrealized gain (loss) recognized
	Three months ended						Three months ended
	September 30, 2010						September 30, 2009
	Derivative			Hedged item			Derivative			Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate time deposits (a)	$	—			—		$	(133	)		133
Fixed rate long-term borrowings (a)		28,281			(27,166	)		19,265			(18,349	)


Total	$	28,281			(27,166	)	$	19,132			(18,216	)


Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	813					$	(1,421	)
Foreign exchange and other option and futures contracts (b)		(1,532	)					604


Total	$	(719	)				$	(817	)


	Amount of unrealized gain (loss) recognized
	Nine months ended						Nine months ended
	September 30, 2010						September 30, 2009
	Derivative			Hedged item			Derivative			Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate time deposits (a)	$	(503	)		503		$	(1,527	)		1,520
Fixed rate long-term borrowings (a)		84,708			(80,827	)		(62,452	)		58,476


Total	$	84,205			(80,324	)	$	(63,979	)		59,996


Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	(305	)				$	(2,778	)
Foreign exchange and other option and futures contracts (b)		(575	)					1,536


Total	$	(880	)				$	(1,242	)


(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 $34 million and $20 million at September 30, 2010 and December 31, 2009, respectively. Changes in unrealized gains and losses are included in mortgage banking revenues and, in general, are realized in subsequent periods as the related loans are sold and commitments satisfied.

The aggregate fair value of derivative financial instruments in a net liability position at September 30, 2010 for which the Company was required to post collateral was $302 million. The fair value of collateral posted for such instruments was $298 million.

The Company’s credit exposure with respect to the estimated fair value as of September 30, 2010 of interest rate swap agreements used for managing interest rate risk has been substantially mitigated through master netting arrangements with trading account interest rate contracts with the same counterparties as well as counterparty postings of $80 million of collateral with the Company.

Variable interest entities and asset securitizations	9 Months Ended
Variable interest entities and asset securitizations	Sep. 30, 2010
Variable interest entities and asset securitizations [Abstract]
Variable interest entities and asset securitizations	11. Variable interest entities and asset securitizations Effective January 1, 2010, the Financial Accounting Standards Board (“FASB”) amended accounting guidance relating to the consolidation of variable interest entities to eliminate the quantitative approach previously required for determining the primary beneficiary of a variable interest entity. The amended guidance instead requires a reporting entity to qualitatively assess the determination of the primary beneficiary of a variable interest entity based on whether the reporting entity has the power to direct the activities that most significantly impact the variable interest entity’s economic performance and has the obligation to absorb losses or the right to receive benefits of the variable interest entity that could potentially be significant to the variable interest entity. The amended guidance requires ongoing reassessments of whether the reporting entity is the primary beneficiary of a variable interest entity. Also effective January 1, 2010, the FASB amended accounting guidance relating to accounting for transfers of financial assets to eliminate the exceptions for qualifying special-purpose entities from the consolidation guidance and the exception that permitted sale accounting for certain mortgage securitizations when a transferor has not surrendered control over the transferred assets. The recognition and measurement provisions of the amended guidance were required to be applied prospectively. Additionally, beginning January 1, 2010, the concept of a qualifying special-purpose entity is no longer relevant for accounting purposes. Therefore, formerly qualifying special-purpose entities had to be re-evaluated for consolidation in accordance with applicable consolidation guidance, including the new accounting guidance relating to the consolidation of variable interest entities discussed in the previous paragraph. In 2002 and 2003, the Company transferred approximately $1.9 billion of one-to-four family residential mortgage loans to qualified special-purpose trusts in two non-recourse securitization transactions. In exchange for the loans, the Company received cash, no more than 88% of the resulting securities, and the servicing rights to the loans. Through December 31, 2009, all of the retained securities were classified as investment securities available for sale as the qualified special-purpose trusts were not included in the Company’s consolidated financial statements. Effective January 1, 2010, the Company determined that it was the primary beneficiary of both securitization trusts under the amended consolidation rules considering its role as servicer and its retained subordinated interests in the trusts. As a result, beginning January 1, 2010, the Company included the one-to-four family residential mortgage loans that were included in the two non-recourse securitization transactions in its consolidated financial statements. The effect of that consolidation on January 1, 2010 was to increase loans receivable by $424 million, decrease the amortized cost of available-for-sale investment securities by $360 million (fair value of $355 million), and increase borrowings by $65 million. The transition adjustment at January 1, 2010 as a result of the Company’s adoption of the new accounting requirements was not significant. In the second quarter of 2010, the 2002 securitization trust was terminated as the Company exercised its right to purchase the underlying mortgage loans pursuant to the clean-up call provisions of the qualified special-purpose trust. At September 30, 2010, the carrying value of the loans in the remaining securitization trust was $283 million. The outstanding principal amount of mortgage-backed securities issued by the qualified special purpose trust was $290 million at September 30, 2010 and the principal amount of such securities held by the Company was $247 million. The remainder of the outstanding mortgage-backed securities were held by parties unrelated to M&T. Because the transaction was non-recourse, the Company’s maximum exposure to loss as a result of its association with the trust at September 30, 2010 is limited to realizing the carrying value of the loans less the $43 million carrying value of the mortgage-backed securities outstanding to third parties. In the first quarter of 2009, the Company securitized approximately $141 million of one-to-four family residential mortgage loans in guaranteed mortgage securitizations with Fannie Mae. The Company recognized no gain or loss on the transactions as it retained all of the resulting securities. Such securities were classified as investment securities available for sale. The Company expects no material credit-related losses on the retained securities as a result of the guarantees by Fannie Mae. Other variable interest entities in which the Company holds a variable interest are described below. M&T has a variable interest in a trust that holds AIB ADSs for the purpose of satisfying options to purchase such shares for certain employees. The trust purchased the AIB ADSs with the proceeds of a loan from an entity subsequently acquired by M&T. Proceeds from option exercises and any dividends and other earnings on the trust assets are used to repay the loan plus interest. Option holders have no preferential right with respect to the trust assets and the trust assets are subject to the claims of M&T’s creditors. The trust has been included in the Company’s consolidated financial statements. As a result, included in investment securities available for sale were 591,813 AIB ADSs with a carrying value of approximately $1 million and $2 million at September 30, 2010 and December 31, 2009, respectively. Outstanding options granted to employees who have continued service with M&T totaled 138,800 and 189,450 at September 30, 2010 and December 31, 2009, respectively. All outstanding options were fully vested and exercisable at both September 30, 2010 and December 31, 2009. The options expire at various dates through October 2011. The AIB ADSs are included in available for sale investment securities and have a fair value and an amortized cost of $1 million at September 30, 2010. An other-than-temporary impairment charge of $12 million was recognized during the second quarter of 2010 on the AIB ADSs due to adverse developments impacting AIB, including significant dilution of AIB common shareholders and further deterioration of AIB’s financial condition. 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, 2010 and December 31, 2009, the Company included the Junior Subordinated Debentures as “long-term borrowings” in its consolidated balance sheet. The Company has recognized $34 million in other assets for its “investment” in the common securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the Junior Subordinated Debentures associated with 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 $1.0 billion at each of September 30, 2010 and December 31, 2009. 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 $246 million, including $75 million of unfunded commitments, at September 30, 2010 and $246 million, including $89 million of unfunded commitments, at December 31, 2009. The Company has not provided financial or other support to the partnerships that was not contractually required. Management currently estimates that no material losses are probable as a result of the Company’s involvement with such entities. In accordance with the accounting provisions for variable interest entities, the Company, in its position as limited partner, does not direct the activities that most significantly impact the economic performance of the partnerships and therefore, the partnership entities are not included in the Company’s consolidated financial statements.

Fair value measurements

9 Months Ended

Sep. 30, 2010

Fair value measurements [Abstract]

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, 2010.

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

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

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

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

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

Trading account assets and liabilities

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

Investment securities available for sale

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

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

In April 2009, the FASB issued new accounting rules that provided guidance for estimating fair value when the volume and level of trading activity for an asset or liability have significantly decreased. The Company has concluded that there has been a significant decline in the volume and level of activity in the market for privately issued mortgage-backed securities. Therefore, the Company supplemented its determination of fair value for many of its privately issued mortgage-backed securities by obtaining pricing indications from two independent sources at September 30, 2010. 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 144 of its privately issued residential mortgage-backed securities with an amortized cost basis of $1.6 billion at September 30, 2010. The Company’s internal modeling techniques included discounting estimated bond-specific cash flows using assumptions about cash flows associated with loans underlying each of the bonds, including estimates about the timing and amount of credit losses and prepayments. In estimating those cash flows, the Company used assumptions as to future delinquency, defaults and loss rates, including assumptions for further home price depreciation. Differences between internal model valuations and external pricing indications were generally considered to be reflective of the lack of liquidity in the market for privately issued mortgage-backed securities given the nature of the cash flow modeling performed in the Company’s assessment of value. To determine the point within the range of potential values that was most representative of fair value under current market conditions for each of the 144 bonds, the Company computed values based on judgmentally applied weightings of the internal model valuations and the indications obtained from the average of the two independent pricing sources. Weightings applied to internal model valuations generally ranged from zero to 40% depending on bond structure and collateral type, with prices for bonds in non-senior tranches generally receiving lower weightings on the internal model results and senior bonds receiving a higher model weighting. Weighted-average reliance on internal model pricing for the bonds modeled was 37% with a 63% average weighting placed on the values provided by the independent sources. The Company concluded its estimate of fair value for the $1.6 billion of privately issued residential mortgage-backed securities to approximate $1.4 billion, which implies a weighted-average market yield based on reasonably likely cash flows of 8.5%. Other valuations of privately issued residential mortgage-backed securities were determined by reference to independent pricing sources without adjustment.

Included in collateralized debt obligations are securities backed by trust preferred securities issued by financial institutions and other entities. Given the severe disruption in the credit markets and lack of observable trade information, the Company could not obtain pricing indications for many of these securities from its two primary independent pricing sources. The Company, therefore, performed internal modeling to estimate the cash flows and fair value of its portfolio of securities backed by trust preferred securities at September 30, 2010. The modeling techniques included discounting estimated cash flows using bond-specific assumptions about defaults, deferrals and prepayments of the trust preferred securities underlying each bond. The estimation of cash flows included assumptions as to future collateral defaults and related loss severities. The resulting cash flows were then discounted by reference to market yields observed in the single-name trust preferred securities market. At September 30, 2010, the total amortized cost and fair value of securities backed by trust preferred securities issued by financial institutions and other entities was $96 million and $109 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, 2010.

Real estate loans held for sale

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

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

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

Interest rate swap agreements used for interest rate risk management

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

The following tables present assets and liabilities at September 30, 2010 and December 31, 2009 measured at estimated fair value on a recurring basis:


	Fair value
	measurements at
	September 30,
	2010		Level 1(a)		Level 2(a)		Level 3
	(in thousands)
Trading account assets	$	536,702		49,528		487,174		—
Investment securities available for sale:
U.S. Treasury and federal agencies		75,565		—		75,565		—
Obligations of states and political subdivisions		64,352		—		64,352		—
Mortgage-backed securities:
Government issued or guaranteed		3,574,898		—		3,574,898		—
Privately issued residential		1,523,368		—		—		1,523,368
Privately issued commercial		23,480		—		—		23,480
Collateralized debt obligations		109,342		—		—		109,342
Other debt securities		293,964		—		293,964		—
Equity securities		118,527		108,373		10,154		—

		5,783,496		108,373		4,018,933		1,656,190

Real estate loans held for sale		656,888		—		656,888		—
Other assets(b)		167,399		—		140,845		26,554

Total assets	$	7,144,485		157,901		5,303,840		1,682,744


Trading account liabilities	$	425,084		—		425,084		—
Other liabilities(b)		11,988		—		11,851		137

Total liabilities	$	437,072		—		436,935		137


	Fair value
	measurements at
	December 31,
	2009		Level 1		Level 2		Level 3
	(in thousands)
Trading account assets	$	386,984		40,836		346,148		—
Investment securities available for sale:
U.S. Treasury and federal agencies		104,686		—		104,686		—
Obligations of states and political subdivisions		62,923		—		62,923		—
Mortgage-backed securities:
Government issued or guaranteed		3,902,282		—		3,902,282		—
Privately issued residential		2,064,904		—		—		2,064,904
Privately issued commercial		25,166		—		—		25,166
Collateralized debt obligations		115,346		—		—		115,346
Other debt securities		268,201		—		267,781		420
Equity securities		160,870		145,817		15,053		—

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


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

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


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

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


(a)		There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the three and nine months ended September 30, 2010.

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

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three months ended September 30, 2010 were as follows:


																	Changes in
																	unrealized
																	gains (losses)
																	included in
			Total gains (losses)														earnings
			realized/unrealized														related to
						Included in						Transfer					assets still
	Balance-					other						in and/or			Balance-		held at
	June 30,		Included			comprehensive						out of			September 30,		September 30,
	2010		in earnings			income			Settlements			Level 3(c)			2010 .		2010
	(in thousands)
Investment securities available for sale:
Privately issued residential mortgage-backed securities	$	1,598,033		(6,675	)(a)		37,634			(105,624	)		—			1,523,368		(6,675	)(a)
Privately issued commercial mortgage-backed securities		26,643		—			(1,369	)		(1,794	)		—			23,480		—
Collateralized debt obligations		118,040		(2,857	)(a)		(5,592	)		(249	)		—			109,342		(2,857	)(a)
Other debt securities		—		—			—			—			—			—		—

		1,742,716		(9,532	)		30,673			(107,667	)		—			1,656,190		(9,532	)
Other assets and other liabilities		20,843		38,399	(b)		—			—			(32,825	)		26,417		23,910	(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, 2009 were as follows:


																Changes in
																unrealized
																gains (losses)
																included in
			Total gains (losses)													earnings
			realized/unrealized													related to
						Included in		Purchases,			Transfer					assets still
	Balance-					other		sales,			in and/or			Balance-		held at
	June 30,		Included			comprehensive		issuances &			out of			September 30,		September 30,
	2009		in earnings			income		settlements			Level 3(c)			2009		2009
	(in thousands)
Investment securities available for sale:
Obligations of states and political subdivisions	$	12,203		—			132		—			—			12,335		—
Privately issued residential mortgage-backed securities		2,241,758		(44,278	)(a)		161,308		(174,551	)		—			2,184,237		(44,278	)(a)
Privately issued commercial mortgage-backed securities		23,018		—			523		—			—			23,541		—
Collateralized debt obligations		112,372		(2,502	)(a)		19,205		2,262			—			131,337		(2,502	)(a)
Other debt securities		765		—			70		—			(450	)		385		—
Equity securities		2,329		—			1		(12	)		—			2,318		—

		2,392,445		(46,780	)		181,239		(172,301	)		(450	)		2,354,153		(46,780	)
Other assets and other liabilities		9,676		16,195	(b)		—		—			(11,951	)		13,920		13,148	(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, 2010 were as follows:


																	Changes in
																	unrealized
																	gains (losses)
																	included in
				Total gains (losses)													earnings
				realized/unrealized													related to
							Included in					Transfer					assets still
	Balance-						other					in and/or			Balance-		held at
	January 1,			Included			comprehensive					out of			September 30,		September 30,
	2010			in earnings			income		Settlements			Level 3(c)			2010		2010
	(in thousands)
Investment securities available for sale:
Privately issued residential mortgage-backed securities	$	2,064,904			(41,018	)(a)		152,882		(298,152	)		(355,248	)(d)		1,523,368		(41,018	)(a)
Privately issued commercial mortgage-backed securities		25,166			—			4,725		(6,411	)		—			23,480		—
Collateralized debt obligations		115,346			(5,703	)(a)		215		(516	)		—			109,342		(5,703	)(a)
Other debt securities		420			—			35		—			(455	)		—		—

		2,205,836			(46,721	)		157,857		(305,079	)		(355,703	)		1,656,190		(46,721	)
Other assets and other liabilities		(80	)		86,249	(b)		—		—			(59,752	)		26,417		26,326	(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, 2009 were as follows:


																	Changes in
																	unrealized
																	gains (losses)
																	included in
			Total gains (losses)														earnings
			realized/unrealized														related to
						Included in			Purchases,			Transfer					assets still
	Balance-					other			sales,			in and/or			Balance-		held at
	January 1,		Included			comprehensive			issuances &			out of			September 30,		September 30,
	2009		in earnings			income			settlements			Level 3(c)			2009		2009
	(in thousands)
Investment securities available for sale:
U.S. Treasury and federal agencies	$	5,532		—			—			—			(5,532	)		—		—
Obligations of states and political subdivisions		38		—			154			—			12,143			12,335		—
Government issued or guaranteed mortgage- backed securities		84,544		—			—			—			(84,544	)		—		—
Privately issued residential mortgage-backed securities		2,326,554		(98,746	)(a)		376,435			(420,006	)		—			2,184,237		(98,746	)(a)
Privately issued commercial mortgage- backed securities		41,046		—			(8,478	)		(9,027	)		—			23,541		—
Collateralized debt obligations		2,496		(4,055	)(a)		32,917			99,979			—			131,337		(4,055	)(a)
Other debt securities		—		—			110			725			(450	)		385		—
Equity securities		2,302		—			2			14			—			2,318		—

		2,462,512		(102,801	)		401,140			(328,315	)		(78,383	)		2,354,153		(102,801	)
Other assets and other liabilities		8,266		35,685	(b)		—			—			(30,031	)		13,920		16,444	(b)


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

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

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

(d)		As a result of the Company’s adoption of new accounting rules governing the consolidation of variable interest entities, effective January 1, 2010 the Company derecognized $355 million of available-for-sale investment securities previously classified as Level 3 measurements. Further information regarding the Company’s adoption of new accounting requirements is included in note 11.

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.

Loans

Loans are generally not recorded at fair value on a recurring basis. Periodically, the Company records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectible portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral-dependent loans when establishing the allowance for credit losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated valuation amount does not necessarily represent the fair value of the loan. Real estate collateral is typically valued using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurement adjustments have generally been classified as Level 2, unless significant adjustments have been made to the valuation that are not readily observable by market participants. Estimates of fair value used for other collateral supporting commercial loans generally are based on assumptions not observable in the marketplace and therefore such valuations have been classified as Level 3. Loans subject to nonrecurring fair value measurement were $625 million at September 30, 2010, ($373 million and $252 million of which were classified as Level 2 and Level 3, respectively) and $828 million at September 30, 2009 ($301 million and $527 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, 2010 were decreases of $61 million and $154 million for the three and nine months ended September 30, 2010, respectively, and on loans held by the Company on September 30, 2009 were decreases of $136 million and $292 million for the three months and nine months ended September 30, 2009, respectively.

Capitalized servicing rights

Capitalized servicing rights are initially measured at fair value in the Company’s consolidated balance sheet. The Company utilizes the amortization method to subsequently measure its capitalized servicing assets. In accordance with GAAP, the Company must record impairment charges, on a nonrecurring basis, when the carrying value of certain strata exceed their estimated fair value. To estimate the fair value of servicing rights, the Company considers market prices for similar assets, if available, and the present value of expected future cash flows associated with the servicing rights calculated using assumptions that market participants would use in estimating future servicing income and expense. Such assumptions include estimates of the cost of servicing loans, loan default rates, an appropriate discount rate, and prepayment speeds. For purposes of evaluating and measuring impairment of capitalized servicing rights, the Company stratifies such assets based on the predominant risk characteristics of the underlying financial instruments that are expected to have the most impact on projected prepayments, cost of servicing and other factors affecting future cash flows associated with the servicing rights. Such factors may include financial asset or loan type, note rate and term. The amount of impairment recognized is the amount by which the carrying value of the capitalized servicing rights for a stratum exceed estimated fair value. Impairment is recognized through a valuation allowance. The determination of fair value of capitalized servicing rights is considered a Level 3 valuation. At September 30, 2010, $33 million of capitalized servicing rights had a carrying value equal to their fair value. Changes in fair value of capitalized servicing rights recognized for the three and nine months ended September 30, 2010 reflected decreases of $3 million and $6 million, respectively. At September 30, 2009, $28 million of capitalized servicing rights had a carrying value equal to their fair value. Changes in fair value of capitalized servicing rights recognized for the nine months ended September 30, 2009 reflected increases in fair value of $18 million. There were no similar changes during the three months ended September 30, 2009.

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 $160 million and $38 million at September 30, 2010 and September 30, 2009, respectively. Changes in fair value recognized for those foreclosed assets held by the Company at September 30, 2010 were $19 million and $34 million for the three and nine months ended September 30, 2010, respectively. Changes in fair value recognized for those foreclosed assets held by the Company at September 30, 2009 were $4 million and $25 million for the three and nine months ended September 30, 2009, respectively.

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 calculated estimates of fair value for financial instrument assets (liabilities) are presented in the following table:


	September 30, 2010						December 31, 2009
	Carrying			Calculated			Carrying			Calculated
	amount			estimate			amount			estimate
	(in thousands)
Financial assets:
Cash and cash equivalents	$	1,089,325		$	1,089,325		$	1,246,342		$	1,246,342
Interest-bearing deposits at banks		401,624			401,624			133,335			133,335
Agreements to resell securities		425,000			425,000			—			—
Trading account assets		536,702			536,702			386,984			386,984
Investment securities		7,662,715			7,575,042			7,780,609			7,629,485
Loans and leases:
Commercial loans and leases		12,788,136			12,494,338			13,479,447			13,090,206
Commercial real estate loans		20,580,450			20,258,451			20,949,931			20,426,273
Residential real estate loans		5,754,432			5,556,767			5,463,463			5,058,763
Consumer loans		11,668,540			11,333,568			12,043,845			11,575,525
Allowance for credit losses		(894,720	)		—			(878,022	)		—

Loans and leases, net		49,896,838			49,643,124			51,058,664			50,150,767
Accrued interest receivable		224,475			224,475			214,692			214,692

Financial liabilities:
Noninterest-bearing deposits	$	(14,665,603	)	$	(14,665,603	)	$	(13,794,636	)	$	(13,794,636	)
Savings deposits and NOW accounts		(27,215,588	)		(27,215,588	)		(25,073,269	)		(25,073,269	)
Time deposits		(6,119,516	)		(6,171,627	)		(7,531,495	)		(7,592,214	)
Deposits at foreign office		(653,916	)		(653,916	)		(1,050,438	)		(1,050,438	)
Short-term borrowings		(1,211,683	)		(1,211,683	)		(2,442,582	)		(2,442,582	)
Long-term borrowings		(8,991,508	)		(9,118,366	)		(10,240,016	)		(9,822,153	)
Accrued interest payable		(110,013	)		(110,013	)		(94,838	)		(94,838	)
Trading account liabilities		(425,084	)		(425,084	)		(302,198	)		(302,198	)

Other financial instruments:
Commitments to originate real estate loans for sale	$	26,417		$	26,417		$	(80	)	$	(80	)
Commitments to sell real estate loans		(10,724	)		(10,724	)		17,771			17,771
Other credit-related commitments		(51,515	)		(51,515	)		(55,954	)		(55,954	)
Interest rate swap agreements used for interest rate risk management		139,718			139,718			54,486			54,486

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

Cash and cash equivalents, interest-bearing deposits at banks, 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 and included appropriate adjustments for expected credit losses. A higher discount rate was assumed with respect to estimated cash flows associated with nonaccrual loans. Projected loan cash flows were adjusted for estimated credit losses. However, such estimates made by the Company may not be indicative of assumptions and adjustments that a purchaser of the Company’s loans and leases would seek.

Deposits

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

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

Long-term borrowings

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

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

Interest rate swap agreements used for interest rate risk management

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

Other commitments and contingencies

As described in note 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.

Commitments and contingencies

9 Months Ended

Sep. 30, 2010

Commitments and contingencies [Abstract]

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,
	2010		2009
	(in thousands)
Commitments to extend credit
Home equity lines of credit	$	6,346,123		6,482,987
Commercial real estate loans to be sold		157,952		180,498
Other commercial real estate and construction		1,501,564		1,360,805
Residential real estate loans to be sold		930,160		631,090
Other residential real estate		217,352		127,788
Commercial and other		7,731,120		7,155,188

Standby letters of credit		3,779,166		3,828,586

Commercial letters of credit		72,191		66,377

Financial guarantees and indemnification contracts		1,521,275		1,633,549

Commitments to sell real estate loans		1,375,705		1,239,001

Commitments to extend credit are agreements to lend to customers, generally having fixed expiration dates or other termination clauses that may require payment of a fee. Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, whereas commercial letters of credit are issued to facilitate commerce and typically result in the commitment being funded when the underlying transaction is consummated between the customer and 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 Federal National Mortgage Association Delegated Underwriting and Servicing program. The Company’s maximum credit risk for recourse associated with loans sold under this program totaled approximately $1.5 billion and $1.3 billion at September 30, 2010 and December 31, 2009, respectively.

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

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

The Company 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 $89 million at September 30, 2010. Assets of subsidiaries providing reinsurance that are available to satisfy claims totaled approximately $74 million at September 30, 2010. The amounts noted above are not necessarily indicative of losses which may ultimately be incurred. Such losses are expected to be substantially less because most loans are repaid by borrowers in accordance with the original loan terms. Management believes 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 mortgage 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, 2010, management believes that any remaining liability arising out of the Company’s obligation to loan purchasers is not material to the Company’s consolidated financial position.

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

Segment information

9 Months Ended

Sep. 30, 2010

Segment information [Abstract]

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, 2009. 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 2009 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
	2010								2009
			Inter-			Net					Inter-			Net
	Total		segment			income			Total		segment			income
	revenues(a)		revenues			(loss)			revenues(a)		revenues			(loss)
	(in thousands)
Business Banking	$	103,475		290			24,295			108,744		—			33,707

Commercial Banking		199,139		282			71,567			183,407		—			41,158

Commercial Real Estate		118,666		104			53,727			107,524		14			42,229

Discretionary Portfolio		12,493		(2,733	)		(2,759	)		1,346		(2,894	)		(10,496	)

Residential Mortgage Banking		73,744		9,419			9,408			74,336		11,170			1,209

Retail Banking		302,656		2,632			55,572			336,049		2,902			74,043

All Other		49,594		(9,994	)		(19,795	)		14,475		(11,192	)		(54,186	)


Total	$	859,767		—			192,015			825,881		—			127,664


	Nine months ended September 30
	2010								2009
			Inter-			Net						Inter-			Net
	Total		segment			income			Total			segment			income
	revenues (a)		revenues			(loss)			revenues (a)			revenues			(loss)
	(in thousands)
Business Banking	$	307,881		290			76,191			305,511			—			94,518

Commercial Banking		586,120		282			230,047			535,092			—			168,315

Commercial Real Estate		338,566		161			141,147			297,335			53			108,669

Discretionary Portfolio		5,840		(7,980	)		(22,994	)		29,077			(9,671	)		(18,864	)

Residential Mortgage Banking		202,627		26,492			9,536			234,363			38,041			(4,168	)

Retail Banking		925,769		8,009			181,689			933,726			8,066			180,590

All Other		147,788		(27,254	)		(83,897	)		(55,859	)		(36,489	)		(285,987	)


Total	$	2,514,591		—			531,719			2,279,245			—			243,073


	Average total assets
	Nine months ended				Year ended
	September 30				December 31
	2010		2009		2009
	(in millions)
Business Banking	$	4,850		4,821		4,869

Commercial Banking		15,460		15,451		15,399

Commercial Real Estate		13,198		12,563		12,842

Discretionary Portfolio		14,658		13,642		13,763

Residential Mortgage Banking		2,189		2,619		2,552

Retail Banking		12,133		11,862		12,024

All Other		5,851		6,026		6,023


Total	$	68,339		66,984		67,472


(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 owed 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 $5,865,000 and $5,795,000 for the three-month periods ended September 30, 2010 and 2009, respectively, and $17,893,000 and $15,942,000 for the nine-month periods ended September 30, 2010 and 2009, 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.

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.	9 Months Ended
	Sep. 30, 2010
Relationship With Other Entities [Abstract]
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. In 2007 M&T invested $300 million to acquire a 20% minority interest in Bayview Lending Group LLC (“BLG”), a privately-held company that, together with its affiliates, specializes in securitizing and servicing real estate loans and other assets. M&T recognizes income from BLG using the equity method of accounting. Bayview Financial Holdings, L.P. (together with its affiliates, “Bayview Financial”), a privately-held specialty mortgage finance company, is BLG’s majority investor. In addition to their common investment in BLG, the Company and Bayview Financial conduct other business activities with each other. The Company has purchased loan servicing rights for small balance commercial mortgage loans from BLG and Bayview Financial having outstanding principal balances of $5.4 billion and $5.5 billion at September 30, 2010 and December 31, 2009, respectively. Amounts recorded as capitalized servicing assets for such loans totaled $29 million at September 30, 2010 and $40 million at December 31, 2009. Capitalized servicing rights at September 30, 2010 and December 31, 2009 also included $11 million and $17 million, respectively, for servicing rights that were purchased from Bayview Financial related to residential mortgage loans with outstanding principal balances of $3.8 billion at September 30, 2010 and $4.1 billion at December 31, 2009. Revenues from servicing residential and small balance commercial mortgage loans purchased from BLG and Bayview Financial were $11 million and $12 million during the quarters ended September 30, 2010 and 2009, respectively, and $35 million and $38 million for the nine months ended September 30, 2010 and 2009, respectively. M&T Bank provided $34 million of credit facilities to Bayview Financial at December 31, 2009, of which $24 million were outstanding. At September 30, 2010, there were no such credit facilities provided. In addition, at September 30, 2010 and December 31, 2009, the Company held $23 million and $25 million, respectively, of collateralized mortgage obligations in its available-for-sale investment securities portfolio that were securitized by Bayview Financial. Finally, the Company held $325 million and $352 million of similar investment securities in its held-to-maturity portfolio at September 30, 2010 and December 31, 2009, respectively.

Relationship of M&T and AIB	9 Months Ended
Relationship of M&T and AIB	Sep. 30, 2010
Relationship With Acquiree Abstract
Relationship with other Affiliate	16. Relationship of M&T and AIB AIB received 26,700,000 shares of M&T common stock on April 1, 2003 as a result of M&T’s acquisition of a subsidiary of AIB on that date. Those shares of common stock owned by AIB represented 22.4% of the issued and outstanding shares of M&T common stock on September 30, 2010. In an effort to raise its capital position to meet new Irish government-mandated capital requirements, AIB announced in March 2010 that it planned to sell its ownership interest in M&T by the end of 2010. On October 6, 2010, AIB issued 26.7 million Contingent Mandatorily Exchangeable Notes, each note mandatorily exchangeable into one share of M&T Common Stock. The Notes were sold to institutional and retail investors and will convert to M&T common stock five business days following the approval of the disposition plan by AIB shareholders. AIB convened a special meeting of its shareholders on November 1, 2010 where the disposition of AIB’s stake in M&T and the exchange of the Notes for M&T common stock was approved. AIB announced on November 4, 2010 that it had completed the sale of the 26,700,000 shares of M&T common stock. As a result, the provisions of the Agreement and Plan of Reorganization between M&T and AIB which include several provisions related to AIB’s rights as a substantial shareholder in the corporate governance of M&T became inoperative, since AIB’s ownership position in M&T will no longer exist.

Subsequent event	9 Months Ended
Subsequent event	Sep. 30, 2010
Subsequent Event [Abstract]
Subsequent events	17. Subsequent event On November 1, 2010, M&T entered into a definitive agreement with Wilmington Trust Corporation (“Wilmington Trust”), headquartered in Wilmington, Delaware, under which Wilmington Trust will merge with M&T. Pursuant to the terms of the merger agreement, Wilmington Trust common shareholders will receive .051372 shares of M&T common stock in exchange for each share of Wilmington Trust common stock in a stock-for-stock transaction valued at $351 million (with the price and exchange ratio based on M&T’s closing price of $74.75 per share as of October 29, 2010), plus the assumption of $330 million in preferred stock issued as part of the Troubled Asset Relief Program — Capital Purchase Program of the U.S. Department of Treasury. At September 30, 2010, Wilmington Trust had approximately $10.4 billion of assets, including $8.1 billion of loans, $9.3 billion of liabilities, including $8.3 billion of deposits, and $58.4 billion of assets under management. The merger is subject to a number of conditions, including the approval of various state and Federal regulators and Wilmington Trust’s common shareholders, and is expected to be completed by mid-year 2011.

Acquisitions (Tables)

9 Months Ended

Sep. 30, 2010

Acquisitions (Tables) [Abstract]

Fair value of acquired loan portfolio

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


	May 23, 2009
	(in thousands)
Contractually required principal and interest at acquisition	$	5,465,167
Contractual cash flows not expected to be collected		(832,115	)

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

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

Outstanding principal balance and the carrying amount of acquired loans


	(in thousands)
Outstanding principal balance	$	3,330,133
Carrying amount		3,142,319

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


	Three months ended		Nine months ended
	September 30, 2009		September 30, 2009
	(in thousands)
Salaries and employee benefits	$	870		9,649
Equipment and net occupancy		1,845		2,430
Printing, postage and supplies		629		3,444
Other costs of operations		10,666		67,370

	$	14,010		82,893

Pro forma information

Additionally, the Company expects to achieve further operating cost savings and other business synergies as a result of the acquisition which are not reflected in the pro forma amounts that follow.


	Actual since
	acquisition		Pro forma
	through		Nine months ended
	September 30, 2009		September 30, 2009
	(in thousands)
Total revenues	$	116,016		2,864,760
Net income		18,583		157,653

Investment securities (Tables)

9 Months Ended

Sep. 30, 2010

Investment securities (Tables) [Abstract]

Amortized cost and estimated fair value of investment securities

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


			Gross		Gross
	Amortized		unrealized		unrealized		Estimated
	cost		gains		losses		fair value
	(in thousands)
September 30, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	73,395		2,216		46	$	75,565
Obligations of states and political subdivisions		63,528		866		42		64,352
Mortgage-backed securities:
Government issued or guaranteed		3,391,427		183,529		58		3,574,898
Privately issued residential		1,769,795		12,736		259,163		1,523,368
Privately issued commercial		28,116		—		4,636		23,480
Collateralized debt obligations		96,130		22,972		9,760		109,342
Other debt securities		309,095		27,325		42,456		293,964
Equity securities		120,828		5,433		7,734		118,527

		5,852,314		255,077		323,895		5,783,496

Investment securities held to maturity:
Obligations of states and political subdivisions		204,599		6,856		33		211,422
Mortgage-backed securities:
Government issued or guaranteed		884,445		27,531		—		911,976
Privately issued		324,513		—		122,027		202,486
Other debt securities		12,160		—		—		12,160

		1,425,717		34,387		122,060		1,338,044

Other securities		453,502		—		—		453,502

Total	$	7,731,533		289,464		445,955	$	7,575,042


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

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

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

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

Other securities		508,624		—		—		508,624

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

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


	Three months ended September 30
	2010			2009
	(in thousands)
Beginning balance	$	314,263			205,918
Additions for credit losses not previously recognized		9,532			47,033
Reductions for increases in cash flows		(108	)		(254	)
Reductions for realized losses		(11,812	)		(425	)


Ending balance	$	311,875			252,272


	Nine months ended September 30
	2010			2009
	(in thousands)
Beginning balance	$	284,513			155,967
Additions for credit losses not previously recognized		46,721			104,001
Reductions for increases in cash flows		(450	)		(1,201	)
Reductions for realized losses		(18,909	)		(6,495	)


Ending balance	$	311,875			252,272

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

At September 30, 2010, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:


	Amortized		Estimated
	cost		fair value
	(in thousands)
Debt securities available for sale:
Due in one year or less	$	48,926		49,213
Due after one year through five years		55,277		57,558
Due after five years through ten years		27,647		30,012
Due after ten years		410,298		406,440

		542,148		543,223
Mortgage-backed securities available for sale		5,189,338		5,121,746

	$	5,731,486		5,664,969

Debt securities held to maturity:
Due in one year or less	$	40,961		41,191
Due after one year through five years		10,864		11,417
Due after five years through ten years		130,978		136,206
Due after ten years		33,956		34,768

		216,759		223,582
Mortgage-backed securities held to maturity		1,208,958		1,114,462

	$	1,425,717		1,338,044

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, 2010
Investment securities available for sale:
U.S. Treasury and federal agencies	$	2,017		(46	)		—		—
Obligations of states and political subdivisions		2,057		(7	)		3,210		(35	)
Mortgage-backed securities:
Government issued or guaranteed		4,028		(34	)		2,581		(24	)
Privately issued residential		162,633		(1,981	)		1,143,110		(257,182	)
Privately issued commercial		—		—			23,480		(4,636	)
Collateralized debt obligations		19,532		(9,464	)		3,593		(296	)
Other debt securities		924		(1	)		86,574		(42,455	)
Equity securities		5,488		(3,559	)		1,219		(4,175	)

		196,679		(15,092	)		1,263,767		(308,803	)


Investment securities held to maturity:
Obligations of states and political subdivisions		1,741		(6	)		700		(27	)
Privately issued mortgage-backed securities		—		—			202,486		(122,027	)

		1,741		(6	)		203,186		(122,054	)

Total	$	198,420		(15,098	)		1,466,953		(430,857	)


	Less than 12 months					12 months or more
			Unrealized					Unrealized
	Fair value		losses			Fair value		losses
	(in thousands)
December 31, 2009
Investment securities available for sale:
U.S. Treasury and federal agencies	$	6,265		(53	)		572		(4	)
Obligations of states and political subdivisions		9,540		(83	)		3,578		(45	)
Mortgage-backed securities:
Government issued or guaranteed		685,319		(6,460	)		19,379		(307	)
Privately issued residential		98,312		(2,871	)		1,504,020		(380,208	)
Privately issued commercial		—		—			25,166		(7,967	)
Collateralized debt obligations		13,046		(10,218	)		3,598		(984	)
Other debt securities		5,786		(174	)		138,705		(57,990	)
Equity securities		7,449		(1,728	)		23,159		(13,977	)

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


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

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

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

Allowance for credit losses (Tables)

9 Months Ended

Sep. 30, 2010

Allowance for credit losses (Tables) [Abstract]

Allowance for credit Losses


	Three months ended						Nine months ended
	September 30						September 30
	2010			2009			2010			2009
	(in thousands)
Beginning balance	$	894,667			855,365			878,022			787,904
Provision for credit losses		93,000			154,000			283,000			459,000
Consolidation of loan securitization trusts		—			—			2,752			—
Net charge-offs
Charge-offs		(101,782	)		(150,150	)		(313,167	)		(409,169	)
Recoveries		8,835			8,659			44,113			30,139

Net charge-offs		(92,947	)		(141,491	)		(269,054	)		(379,030	)


Ending balance	$	894,720			867,874			894,720			867,874

Stockholders equity (Tables)

9 Months Ended

Sep. 30, 2010

Stockholders Equity (Tables) [Abstract]

Issued and outstanding preferred stock

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

Carrying

issued and

value

outstanding

September 30, 2010

December 31, 2009

(dollars in thousands)

Series A (a)

Fixed Rate Cumulative Perpetual Preferred Stock, Series A, $1,000 liquidation preference per share, 600,000 shares authorized

600,000

577,082

572,580

Series B (b)

Series B Mandatory Convertible Non-cumulative Preferred Stock, $1,000 liquidation preference per share, 26,500 shares authorized

26,500

Series C (a)(c)

Fixed Rate Cumulative Perpetual Preferred Stock, Series C, $1,000 liquidation preference per share, 151,500 shares authorized

151,500

134,397

131,155


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

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

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

Pension plans and other postretirement benefits (Tables)

9 Months Ended

Sep. 30, 2010

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

Net periodic defined benefit cost for defined benefit plans


							Other
	Pension						postretirement
	benefits						benefits
	Three months ended September 30
	2010			2009			2010			2009
	(in thousands)
Service cost	$	4,918			4,935			101			88
Interest cost on projected benefit obligation		12,031			11,910			782			828
Expected return on plan assets		(12,722	)		(11,963	)		—			—
Amortization of prior service cost		(1,640	)		(1,640	)		44			61
Amortization of net actuarial loss		3,388			2,424			(2	)		(5	)


Net periodic benefit cost	$	5,975			5,666			925			972


							Other
	Pension						postretirement
	benefits						benefits
	Nine months ended September 30
	2010			2009			2010			2009
	(in thousands)
Service cost	$	14,753			14,548			303			265
Interest cost on projected benefit obligation		36,092			34,189			2,347			2,475
Expected return on plan assets		(38,165	)		(35,014	)		—			—
Amortization of prior service cost		(4,919	)		(4,919	)		132			182
Amortization of net actuarial loss		10,164			7,273			(7	)		(15	)


Net periodic benefit cost	$	17,925			16,077			2,775			2,907

Earnings per common share (Tables)

9 Months Ended

Sep. 30, 2010

Earnings per common share (Tables) [Abstract]

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
	2010			2009			2010			2009
	(in thousands, except per share)
Income available to common stockholders:

Net income	$	192,015			127,664			531,719			243,073
Less: Preferred stock dividends(a)		(10,056	)		(10,056	)		(30,169	)		(26,024	)
Amortization of preferred stock discount(a)		(2,653	)		(2,465	)		(7,815	)		(5,620	)

Net income available to common equity		179,306			115,143			493,735			211,429

Less: Income attributable to unvested stock-based compensation awards		(2,526	)		(1,249	)		(6,924	)		(2,367	)


Net income available to common stockholders	$	176,780			113,894			486,811			209,062

Weighted-average shares outstanding:

Common shares outstanding (including common stock issuable) and unvested stock- based compensation awards		120,010			118,663			119,705			114,843
Less: Unvested stock-based compensation awards		(1,690	)		(1,293	)		(1,657	)		(1,142	)


Weighted-average shares outstanding		118,320			117,370			118,048			113,701

Basic earnings per common share	$	1.49			.97			4.12			1.84


(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
	2010			2009			2010			2009
	(in thousands, except per share)
Net income available to common equity	$	179,306			115,143			493,735			211,429

Less: Income attributable to unvested stock-based compensation awards		(2,517	)		(1,249	)		(6,904	)		(2,367	)


Net income available to common stockholders	$	176,789			113,894			486,831			209,062

Adjusted weighted-average shares outstanding:

Common and unvested stock-based compensation awards		120,010			118,663			119,705			114,843
Less: Unvested stock-based compensation awards		(1,690	)		(1,293	)		(1,657	)		(1,142	)
Plus: Incremental shares from assumed conversion of stock- based compensation awards and convertible preferred stock		835			177			718			99


Adjusted weighted-average shares outstanding		119,155			117,547			118,766			113,800

Diluted earnings per common share	$	1.48			.97			4.10			1.84

Comprehensive income (Tables)

9 Months Ended

Sep. 30, 2010

Comprehensive income (Tables) [Abstract]

Components of other comprehensive income (loss)

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


	Nine months ended September 30, 2010
	Before-tax			Income
	amount			taxes			Net
	(in thousands)
Unrealized gains (losses) on investment securities:

Available for sale (“AFS”) investment securities with other-than-temporary impairment (“OTTI”):

Securities with OTTI charges during the period	$	(67,052	)		26,074			(40,978	)
Less: OTTI charges recognized in net income		(58,714	)		22,758			(35,956	)

Net unrealized losses on investment securities with OTTI		(8,338	)		3,316			(5,022	)


AFS investment securities — all other:

Unrealized holding gains during period		166,122			(64,944	)		101,178
Less: Reclassification adjustment for gains recognized in net income		1,023			(392	)		631
Less: Securities with OTTI charges during the period		(67,052	)		26,074			(40,978	)

		232,151			(90,626	)		141,525

Reclassification of unrealized holding losses to income during period on investment securities previously transferred from AFS to held to maturity (“HTM”)		6,400			(2,511	)		3,889


Net unrealized gains on investment securities		230,213			(89,821	)		140,392

Reclassification for amortization of gains on terminated cash flow hedges to income		(336	)		125			(211	)

Defined benefit plans liability adjustment		5,370			(2,108	)		3,262


	$	235,247			(91,804	)		143,443


	Nine months ended September 30, 2009
	Before-tax			Income
	amount			taxes			Net
	(in thousands)
Unrealized gains (losses) on investment securities:

AFS investment securities with OTTI:

Securities with OTTI charges during the period	$	(202,737	)		79,296			(123,441	)
Less: OTTI charges recognized in net income		(104,001	)		40,662			(63,339	)

Net unrealized losses on investment securities with OTTI		(98,736	)		38,634			(60,102	)


AFS investment securities — all other:

Unrealized holding gains during period		389,609			(149,651	)		239,958
Less: Reclassification adjustment for losses realized in net income		(135	)		54			(81	)
Less: Securities with OTTI charges during the period		(202,737	)		79,296			(123,441	)

		592,481			(229,001	)		363,480

Reclassification of unrealized holding losses to income during period on investment securities previously transferred from AFS to HTM		7,955			(2,183	)		5,772


Net unrealized gains on investment securities		501,700			(192,550	)		309,150

Reclassification for amortization of losses on terminated cash flow hedges to income		10,873			(4,246	)		6,627

Defined benefit plans liability adjustment		2,521			(703	)		1,818


	$	515,094			(197,499	)		317,595

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

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


							Cash			Defined
	Investment securities						flow			benefit
	With OTTI			All other			hedges			plans			Total
	(in thousands)
Balance — January 1, 2010	$	(76,772	)		(142,853	)		674			(117,046	)		(335,997	)

Net gain (loss) during period		(5,022	)		145,414			(211	)		3,262			143,443


Balance — September 30, 2010	$	(81,794	)		2,561			463			(113,784	)		(192,554	)


Balance — January 1, 2009	$	—			(556,668	)		(5,883	)		(174,330	)		(736,881	)

Net gain (loss) during period		(60,102	)		369,252			6,627			1,818			317,595


Balance — September 30, 2009	$	(60,102	)		(187,416	)		744			(172,512	)		(419,286	)

Derivative financial instruments (Tables)

9 Months Ended

Sep. 30, 2010

Derivative financial instruments (Tables) [Abstract]

Information about interest rate swap agreements


					Weighted-
	Notional		Average		average rate
	amount		maturity		Fixed			Variable
	(in thousands)		(in years)
September 30, 2010
Fair value hedges:
Fixed rate long-term borrowings (a)	$	1,037,241		5.7		6.33	%		2.18	%


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

	$	1,062,241		6.4		6.30	%		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,		December 31,		September 30,		December 31,
	2010		2009		2010		2009
	(in thousands)
Derivatives designated and qualifying as hedging instruments
Fair value hedges:
Interest rate swap agreements (a)	$	139,718		54,486	$	—		—
Commitments to sell real estate loans (a)		406		6,009		2,945		171

		140,124		60,495		2,945		171

Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale (a)		26,554		4,428		137		4,508
Commitments to sell real estate loans (a)		721		13,293		8,906		1,360
Trading:
Interest rate contracts (b)		439,386		317,651		415,741		290,104
Foreign exchange and other option and futures contracts (b)		8,582		11,908		9,343		12,094

		475,243		347,280		434,127		308,066


Total derivatives	$	615,367		407,775	$	437,072		308,237


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

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

Information about fair values of derivative instruments in consolidated statement of income


	Amount of unrealized gain (loss) recognized
	Three months ended						Three months ended
	September 30, 2010						September 30, 2009
	Derivative			Hedged item			Derivative			Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate time deposits (a)	$	—			—		$	(133	)		133
Fixed rate long-term borrowings (a)		28,281			(27,166	)		19,265			(18,349	)


Total	$	28,281			(27,166	)	$	19,132			(18,216	)


Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	813					$	(1,421	)
Foreign exchange and other option and futures contracts (b)		(1,532	)					604


Total	$	(719	)				$	(817	)


	Amount of unrealized gain (loss) recognized
	Nine months ended						Nine months ended
	September 30, 2010						September 30, 2009
	Derivative			Hedged item			Derivative			Hedged item
	(in thousands)
Derivatives in fair value hedging relationships

Interest rate swap agreements:
Fixed rate time deposits (a)	$	(503	)		503		$	(1,527	)		1,520
Fixed rate long-term borrowings (a)		84,708			(80,827	)		(62,452	)		58,476


Total	$	84,205			(80,324	)	$	(63,979	)		59,996


Derivatives not designated as hedging instruments

Trading:
Interest rate contracts (b)	$	(305	)				$	(2,778	)
Foreign exchange and other option and futures contracts (b)		(575	)					1,536


Total	$	(880	)				$	(1,242	)


(a)		Reported as other revenues from operations.

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

Fair value measurements (Tables)

9 Months Ended

Sep. 30, 2010

Fair value measurements (Tables) [Abstract]

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

The following tables present assets and liabilities at September 30, 2010 and December 31, 2009 measured at estimated fair value on a recurring basis:


	Fair value
	measurements at
	September 30,
	2010		Level 1(a)		Level 2(a)		Level 3
	(in thousands)
Trading account assets	$	536,702		49,528		487,174		—
Investment securities available for sale:
U.S. Treasury and federal agencies		75,565		—		75,565		—
Obligations of states and political subdivisions		64,352		—		64,352		—
Mortgage-backed securities:
Government issued or guaranteed		3,574,898		—		3,574,898		—
Privately issued residential		1,523,368		—		—		1,523,368
Privately issued commercial		23,480		—		—		23,480
Collateralized debt obligations		109,342		—		—		109,342
Other debt securities		293,964		—		293,964		—
Equity securities		118,527		108,373		10,154		—

		5,783,496		108,373		4,018,933		1,656,190

Real estate loans held for sale		656,888		—		656,888		—
Other assets(b)		167,399		—		140,845		26,554

Total assets	$	7,144,485		157,901		5,303,840		1,682,744


Trading account liabilities	$	425,084		—		425,084		—
Other liabilities(b)		11,988		—		11,851		137

Total liabilities	$	437,072		—		436,935		137


	Fair value
	measurements at
	December 31,
	2009		Level 1		Level 2		Level 3
	(in thousands)
Trading account assets	$	386,984		40,836		346,148		—
Investment securities available for sale:
U.S. Treasury and federal agencies		104,686		—		104,686		—
Obligations of states and political subdivisions		62,923		—		62,923		—
Mortgage-backed securities:
Government issued or guaranteed		3,902,282		—		3,902,282		—
Privately issued residential		2,064,904		—		—		2,064,904
Privately issued commercial		25,166		—		—		25,166
Collateralized debt obligations		115,346		—		—		115,346
Other debt securities		268,201		—		267,781		420
Equity securities		160,870		145,817		15,053		—

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


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

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


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

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


(a)		There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the three and nine months ended September 30, 2010.

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

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three months ended September 30, 2010 were as follows:


																	Changes in
																	unrealized
																	gains (losses)
																	included in
			Total gains (losses)														earnings
			realized/unrealized														related to
						Included in						Transfer					assets still
	Balance-					other						in and/or			Balance-		held at
	June 30,		Included			comprehensive						out of			September 30,		September 30,
	2010		in earnings			income			Settlements			Level 3(c)			2010 .		2010
	(in thousands)
Investment securities available for sale:
Privately issued residential mortgage-backed securities	$	1,598,033		(6,675	)(a)		37,634			(105,624	)		—			1,523,368		(6,675	)(a)
Privately issued commercial mortgage-backed securities		26,643		—			(1,369	)		(1,794	)		—			23,480		—
Collateralized debt obligations		118,040		(2,857	)(a)		(5,592	)		(249	)		—			109,342		(2,857	)(a)
Other debt securities		—		—			—			—			—			—		—

		1,742,716		(9,532	)		30,673			(107,667	)		—			1,656,190		(9,532	)
Other assets and other liabilities		20,843		38,399	(b)		—			—			(32,825	)		26,417		23,910	(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, 2009 were as follows:


																Changes in
																unrealized
																gains (losses)
																included in
			Total gains (losses)													earnings
			realized/unrealized													related to
						Included in		Purchases,			Transfer					assets still
	Balance-					other		sales,			in and/or			Balance-		held at
	June 30,		Included			comprehensive		issuances &			out of			September 30,		September 30,
	2009		in earnings			income		settlements			Level 3(c)			2009		2009
	(in thousands)
Investment securities available for sale:
Obligations of states and political subdivisions	$	12,203		—			132		—			—			12,335		—
Privately issued residential mortgage-backed securities		2,241,758		(44,278	)(a)		161,308		(174,551	)		—			2,184,237		(44,278	)(a)
Privately issued commercial mortgage-backed securities		23,018		—			523		—			—			23,541		—
Collateralized debt obligations		112,372		(2,502	)(a)		19,205		2,262			—			131,337		(2,502	)(a)
Other debt securities		765		—			70		—			(450	)		385		—
Equity securities		2,329		—			1		(12	)		—			2,318		—

		2,392,445		(46,780	)		181,239		(172,301	)		(450	)		2,354,153		(46,780	)
Other assets and other liabilities		9,676		16,195	(b)		—		—			(11,951	)		13,920		13,148	(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, 2010 were as follows:


																	Changes in
																	unrealized
																	gains (losses)
																	included in
				Total gains (losses)													earnings
				realized/unrealized													related to
							Included in					Transfer					assets still
	Balance-						other					in and/or			Balance-		held at
	January 1,			Included			comprehensive					out of			September 30,		September 30,
	2010			in earnings			income		Settlements			Level 3(c)			2010		2010
	(in thousands)
Investment securities available for sale:
Privately issued residential mortgage-backed securities	$	2,064,904			(41,018	)(a)		152,882		(298,152	)		(355,248	)(d)		1,523,368		(41,018	)(a)
Privately issued commercial mortgage-backed securities		25,166			—			4,725		(6,411	)		—			23,480		—
Collateralized debt obligations		115,346			(5,703	)(a)		215		(516	)		—			109,342		(5,703	)(a)
Other debt securities		420			—			35		—			(455	)		—		—

		2,205,836			(46,721	)		157,857		(305,079	)		(355,703	)		1,656,190		(46,721	)
Other assets and other liabilities		(80	)		86,249	(b)		—		—			(59,752	)		26,417		26,326	(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, 2009 were as follows:


																	Changes in
																	unrealized
																	gains (losses)
																	included in
			Total gains (losses)														earnings
			realized/unrealized														related to
						Included in			Purchases,			Transfer					assets still
	Balance-					other			sales,			in and/or			Balance-		held at
	January 1,		Included			comprehensive			issuances &			out of			September 30,		September 30,
	2009		in earnings			income			settlements			Level 3(c)			2009		2009
	(in thousands)
Investment securities available for sale:
U.S. Treasury and federal agencies	$	5,532		—			—			—			(5,532	)		—		—
Obligations of states and political subdivisions		38		—			154			—			12,143			12,335		—
Government issued or guaranteed mortgage- backed securities		84,544		—			—			—			(84,544	)		—		—
Privately issued residential mortgage-backed securities		2,326,554		(98,746	)(a)		376,435			(420,006	)		—			2,184,237		(98,746	)(a)
Privately issued commercial mortgage- backed securities		41,046		—			(8,478	)		(9,027	)		—			23,541		—
Collateralized debt obligations		2,496		(4,055	)(a)		32,917			99,979			—			131,337		(4,055	)(a)
Other debt securities		—		—			110			725			(450	)		385		—
Equity securities		2,302		—			2			14			—			2,318		—

		2,462,512		(102,801	)		401,140			(328,315	)		(78,383	)		2,354,153		(102,801	)
Other assets and other liabilities		8,266		35,685	(b)		—			—			(30,031	)		13,920		16,444	(b)


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

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

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

(d)		As a result of the Company’s adoption of new accounting rules governing the consolidation of variable interest entities, effective January 1, 2010 the Company derecognized $355 million of available-for-sale investment securities previously classified as Level 3 measurements. Further information regarding the Company’s adoption of new accounting requirements is included in note 11.

Carrying amounts and estimated fair value for financial instrument assets(liabilities)

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


	September 30, 2010						December 31, 2009
	Carrying			Calculated			Carrying			Calculated
	amount			estimate			amount			estimate
	(in thousands)
Financial assets:
Cash and cash equivalents	$	1,089,325		$	1,089,325		$	1,246,342		$	1,246,342
Interest-bearing deposits at banks		401,624			401,624			133,335			133,335
Agreements to resell securities		425,000			425,000			—			—
Trading account assets		536,702			536,702			386,984			386,984
Investment securities		7,662,715			7,575,042			7,780,609			7,629,485
Loans and leases:
Commercial loans and leases		12,788,136			12,494,338			13,479,447			13,090,206
Commercial real estate loans		20,580,450			20,258,451			20,949,931			20,426,273
Residential real estate loans		5,754,432			5,556,767			5,463,463			5,058,763
Consumer loans		11,668,540			11,333,568			12,043,845			11,575,525
Allowance for credit losses		(894,720	)		—			(878,022	)		—

Loans and leases, net		49,896,838			49,643,124			51,058,664			50,150,767
Accrued interest receivable		224,475			224,475			214,692			214,692

Financial liabilities:
Noninterest-bearing deposits	$	(14,665,603	)	$	(14,665,603	)	$	(13,794,636	)	$	(13,794,636	)
Savings deposits and NOW accounts		(27,215,588	)		(27,215,588	)		(25,073,269	)		(25,073,269	)
Time deposits		(6,119,516	)		(6,171,627	)		(7,531,495	)		(7,592,214	)
Deposits at foreign office		(653,916	)		(653,916	)		(1,050,438	)		(1,050,438	)
Short-term borrowings		(1,211,683	)		(1,211,683	)		(2,442,582	)		(2,442,582	)
Long-term borrowings		(8,991,508	)		(9,118,366	)		(10,240,016	)		(9,822,153	)
Accrued interest payable		(110,013	)		(110,013	)		(94,838	)		(94,838	)
Trading account liabilities		(425,084	)		(425,084	)		(302,198	)		(302,198	)

Other financial instruments:
Commitments to originate real estate loans for sale	$	26,417		$	26,417		$	(80	)	$	(80	)
Commitments to sell real estate loans		(10,724	)		(10,724	)		17,771			17,771
Other credit-related commitments		(51,515	)		(51,515	)		(55,954	)		(55,954	)
Interest rate swap agreements used for interest rate risk management		139,718			139,718			54,486			54,486

Commitments and contingencies (Tables)

9 Months Ended

Sep. 30, 2010

Commitments and Contingencies (Tables) [Abstract]

Company's significant commitments


	September 30,		December 31,
	2010		2009
	(in thousands)
Commitments to extend credit
Home equity lines of credit	$	6,346,123		6,482,987
Commercial real estate loans to be sold		157,952		180,498
Other commercial real estate and construction		1,501,564		1,360,805
Residential real estate loans to be sold		930,160		631,090
Other residential real estate		217,352		127,788
Commercial and other		7,731,120		7,155,188

Standby letters of credit		3,779,166		3,828,586

Commercial letters of credit		72,191		66,377

Financial guarantees and indemnification contracts		1,521,275		1,633,549

Commitments to sell real estate loans		1,375,705		1,239,001

Segment information (Tables)

9 Months Ended

Sep. 30, 2010

Segment information (Tables) [Abstract]

Information about the Company's segments

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


	Three months ended September 30
	2010								2009
			Inter-			Net					Inter-			Net
	Total		segment			income			Total		segment			income
	revenues(a)		revenues			(loss)			revenues(a)		revenues			(loss)
	(in thousands)
Business Banking	$	103,475		290			24,295			108,744		—			33,707

Commercial Banking		199,139		282			71,567			183,407		—			41,158

Commercial Real Estate		118,666		104			53,727			107,524		14			42,229

Discretionary Portfolio		12,493		(2,733	)		(2,759	)		1,346		(2,894	)		(10,496	)

Residential Mortgage Banking		73,744		9,419			9,408			74,336		11,170			1,209

Retail Banking		302,656		2,632			55,572			336,049		2,902			74,043

All Other		49,594		(9,994	)		(19,795	)		14,475		(11,192	)		(54,186	)


Total	$	859,767		—			192,015			825,881		—			127,664


	Nine months ended September 30
	2010								2009
			Inter-			Net						Inter-			Net
	Total		segment			income			Total			segment			income
	revenues (a)		revenues			(loss)			revenues (a)			revenues			(loss)
	(in thousands)
Business Banking	$	307,881		290			76,191			305,511			—			94,518

Commercial Banking		586,120		282			230,047			535,092			—			168,315

Commercial Real Estate		338,566		161			141,147			297,335			53			108,669

Discretionary Portfolio		5,840		(7,980	)		(22,994	)		29,077			(9,671	)		(18,864	)

Residential Mortgage Banking		202,627		26,492			9,536			234,363			38,041			(4,168	)

Retail Banking		925,769		8,009			181,689			933,726			8,066			180,590

All Other		147,788		(27,254	)		(83,897	)		(55,859	)		(36,489	)		(285,987	)


Total	$	2,514,591		—			531,719			2,279,245			—			243,073

Summary of segment Information


	Average total assets
	Nine months ended				Year ended
	September 30				December 31
	2010		2009		2009
	(in millions)
Business Banking	$	4,850		4,821		4,869

Commercial Banking		15,460		15,451		15,399

Commercial Real Estate		13,198		12,563		12,842

Discretionary Portfolio		14,658		13,642		13,763

Residential Mortgage Banking		2,189		2,619		2,552

Retail Banking		12,133		11,862		12,024

All Other		5,851		6,026		6,023


Total	$	68,339		66,984		67,472


(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 owed 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 $5,865,000 and $5,795,000 for the three-month periods ended September 30, 2010 and 2009, respectively, and $17,893,000 and $15,942,000 for the nine-month periods ended September 30, 2010 and 2009, 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.

Acquisitions (Details) $ in Thousands	3 Months Ended		4 Months Ended	9 Months Ended
Acquisitions (Details) $ in Thousands	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($) shares	Dec. 31, 2009 USD ($)	Aug. 28, 2009 USD ($)	May 23, 2009 USD ($) shares
Fair value of acquired loan portfolio
Contractually required principal and interest at acquisition	$ 3,142,319			$ 3,142,319				$ 5,465,167
Contractual cash flows not expected to be collected								(832,115)
Expected cash flows at acquisition								4,633,052
Interest component of expected cash flows								(595,685)
Basis in acquired loans at acquisition - estimated fair value								4,037,367
Outstanding principal balance and the carrying amount of acquired loans
Outstanding principal balance	3,330,133			3,330,133
Carrying amount	3,142,319			3,142,319				5,465,167
Summary of merger-related expenses associated with the Bradford and Provident acquisitions
Salaries and employee benefits	246,389	$ 255,449		756,296	$ 754,793
Equipment and net occupancy	54,353	58,195		165,185	157,688
Printing, postage and supplies	7,820	8,229		25,412	28,878
Other costs of operations	140,006	140,135		392,841	436,611
Acquisitions (Textuals) [Abstract]
Loans and leases included in assets acquired total	51,129,133			51,129,133		$ 52,306,457
Liabilities assumed	60,015,064			60,015,064		61,127,492
Deposits	48,654,623			48,654,623		47,449,838
Investment securities	7,662,715			7,662,715		$ 7,780,609
Value Added in Common Equity due to Provident Acquistion								$ 280,000
Pro forma information
Total revenues			$ 116,016		2,864,760
Net income			18,583		157,653
Additional Acquisitions (Textuals) [Abstract]
After-tax gain on the transaction					18,000
Pre-tax gain on the transaction					$ 29,000
Provident common shareholders received given number of shares of M&T common stock in exchange for each share of Provident common stock \| shares								0.171625
Total common shares issued by M&T Bank \| shares					5,838,308
Acquisition date fair value of common shares issued								$ 273,000
Estimated fair value of converted options to purchase the common stock of M& T Bank								1,000
Total purchase price based on the fair value of the acquisition date								274,000
Increment in stockholder's equity by purchasing common stock associated with Series C preferred stock								162,000
Value added in preferred equity due to Provident Acquistion								$ 156,000
Years over which core deposit intangible being amortized								7
Interest income on acquired loans	$ 43,000	44,000	$ 63,000	$ 121,000
Contractually required principal and interest payments as a percentage of the assets of company								less than .25%
Commerical real estate loans [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases included in assets acquired total								$ 1,700,000
Consumer loans [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases included in assets acquired total								1,400,000
Commerical loans and leases [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases included in assets acquired total								700,000
Residential real estate loans [Member]
Acquisitions (Textuals) [Abstract]
Loans and leases included in assets acquired total								300,000
Bradford acquisition [Member]
Acquisitions (Textuals) [Abstract]
Assets Acquired Total							$ 469,000
Loans and leases included in assets acquired total							302,000
Liabilities assumed							440,000
Deposits							$ 361,000
Provident acquisition [Member]
Acquisitions (Textuals) [Abstract]
Assets Acquired Total								6,300,000
Loans and leases included in assets acquired total								4,000,000
Liabilities assumed								5,900,000
Deposits								5,100,000
Investment securities								1,000,000
Value added in stockholder's equity due to Provident acquistion								436,000
Goodwill								332,000
Core deposit intangible								$ 63,000
Amount of provident's provision for credit losses					$ 42,000
Impact of other-than-temporary impairment losses recognized by provident					87,000
Provident and Bradford acquisition [Member]
Summary of merger-related expenses associated with the Bradford and Provident acquisitions
Salaries and employee benefits		870			9,649
Equipment and net occupancy		1,845			2,430
Printing, postage and supplies		629			3,444
Other costs of operations		10,666			67,370
Total merger-related expenses		$ 14,010			$ 82,893

Investment securities (Details) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
Investment securities (Details) $ in Thousands	Sep. 30, 2010 USD ($)	Jun. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Dec. 31, 2009 USD ($)
Investment securities available for sale:
Investment securities, available for sale, amortized cost	$ 5,852,314			$ 5,852,314		$ 6,997,009
Gross Unrealized Gains				255,077		190,438
Gross Unrealized Losses				323,895		483,069
Estimated fair value	5,783,496			5,783,496		6,704,378
Investment securities available for sale:
Estimated fair value, Less than 12 months	196,679			196,679		825,717
Unrealized Losses, Less than 12 months	(15,092)			(15,092)		(21,587)
Estimated fair value, 12 months or more	1,263,767			1,263,767		1,718,177
Unrealized Losses, 12 months or more	(308,803)			(308,803)		(461,482)
Investment securities held to maturity:
Amortized Cost for Held-to-maturity	1,425,717			1,425,717		567,607
Gross Unrealized Gains for Held-to-maturity				34,387		1,419
Gross Unrealized Losses for Held-to-maturity				122,060		152,543
Estimated fair value for Held-to-maturity	1,338,044			1,338,044		416,483
Investment securities held to maturity:
Held to maturity, Estimated fair value, Less than 12 months	1,741			1,741		136,032
Held to maturity, Unrealized Losses, Less than 12 months	(6)			(6)		(1,492)
Held to maturity, Estimated fair value, 12 months or more	203,186			203,186		201,828
Held to maturity, Unrealized Losses, 12 months or more	(122,054)			(122,054)		(151,051)
Amortized cost and estimated fair value of investment securities
Other securities, Amortized Cost	453,502			453,502		508,624
Other securities, Estimated fair value	453,502			453,502		508,624
Total for Amortized cost	7,731,533			7,731,533		8,073,240
Total for Gross Unrealized Gains				289,464		191,857
Total for Gross Unrealized losses				445,955		635,612
Total for Estimated fair value	7,575,042			7,575,042		7,629,485
Changes in credit losses associated with debt securities for which other than temporary impairment losses
Beginning balance	314,263		$ 205,918	284,513	$ 155,967	155,967
Additions for credit losses not previously recognized	9,532		47,033	46,721	104,001
Reductions for increases in cash flows	(108)		(254)	(450)	(1,201)
Reductions for realized losses	(11,812)		(425)	(18,909)	(6,495)
Ending balance	311,875	$ 314,263	252,272	311,875	252,272	284,513
Debt securities available for sale:
Due in one year or less	48,926			48,926
Due after one year through five years	55,277			55,277
Due after five years through ten years	27,647			27,647
Due after ten years	410,298			410,298
Available For Sale Securities Debt Maturities With Single Maturity Date Amortized Cost	542,148			542,148
Mortgage-backed securities available for sale	5,189,338			5,189,338
Total	5,731,486			5,731,486
Debt securities available for sale:
Due in one year or less	49,213			49,213
Due after one year through five years	57,558			57,558
Due after five years through ten years	30,012			30,012
Due after ten years	406,440			406,440
Available For Sale Securities Debt Maturities With Single Maturity Date Fair Value	543,223			543,223
Mortgage-backed securities available for sale	5,121,746			5,121,746
Total	5,664,969			5,664,969
Debt securities held to maturity:
Due in one year or less	40,961			40,961
Due after one year through five years	10,864			10,864
Due after five years through ten years	130,978			130,978
Due after ten years	33,956			33,956
Held To Maturity Securities Debt Maturities With Single Maturity Date Net Carrying Amount	216,759			216,759
Mortgage-backed securities held to maturity	1,208,958			1,208,958
Total	1,425,717			1,425,717
Debt securities held to maturity:
Due in one year or less	41,191			41,191
Due after one year through five years	11,417			11,417
Due after five years through ten years	136,206			136,206
Due after ten years	34,768			34,768
Held To Maturity Securities Debt Maturities With Single Maturity Date Fair Value	223,582			223,582
Mortgage-backed securities held to maturity	1,114,462			1,114,462
Total	1,338,044			1,338,044
Investment securities in continuous unrealized loss position
Total of investment securities,fair value, less than 12 months	198,420			198,420		961,749
Total of investment securities,unrealized losses, less than 12 months	(15,098)			(15,098)		(23,079)
Total of investment securities, fair value, more than 12 months	1,466,953			1,466,953		1,920,005
Total of investment securities,unrealized losses, more than 12 months	(430,857)			(430,857)		(612,533)
Investment securities (Textuals) [Abstract]
Pre-tax other than temporary impairment losses related to AIB and ADSs		$ 12,000
Pre-tax other-than-temporary impairment losses	$ (9,532)		$ (47,033)	$ (58,714)	$ (104,001)
Number of investment securities with aggregate gross unrealized losses	327			327
Aggregate gross unrealized losses on investment securities				$ 445,955		635,612
Unrealized losses on privately issued residential mortgage-backed securities				381,000
Residential mortgage-backed securities at cost	$ 1,900,000			1,900,000
Unrealized losses on trust preferred securities issued by financial institutions and securities backed by trust preferred securities				52,000
Securities issued by financial institutions backed by trust preferred securities	156,000			156,000
Other (fair value: $453,502 at September 30, 2010; $508,624 at December 31, 2009)	453,502			453,502		508,624
Obligations of states and political subdivisions [Member]
Investment securities held to maturity:
Amortized Cost for Held-to-maturity	204,599			204,599		203,825
Gross Unrealized Gains for Held-to-maturity				6,856		1,419
Gross Unrealized Losses for Held-to-maturity				33		1,550
Estimated fair value for Held-to-maturity	211,422			211,422		203,694
Investment securities held to maturity:
Held to maturity, Estimated fair value, Less than 12 months	1,741			1,741		136,032
Held to maturity, Unrealized Losses, Less than 12 months	(6)			(6)		(1,492)
Held to maturity, Estimated fair value, 12 months or more	700			700		626
Held to maturity, Unrealized Losses, 12 months or more	(27)			(27)		(58)
Other Debt Securities [Member]
Investment securities held to maturity:
Amortized Cost for Held-to-maturity	12,160			12,160		11,587
Estimated fair value for Held-to-maturity	12,160			12,160		11,587
U.S. Treasury and federal agencies [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	73,395			73,395		102,755
Gross Unrealized Gains				2,216		1,988
Gross Unrealized Losses				46		57
Estimated fair value	75,565			75,565		104,686
Investment securities available for sale:
Estimated fair value, Less than 12 months	2,017			2,017		6,265
Unrealized Losses, Less than 12 months	(46)			(46)		(53)
Estimated fair value, 12 months or more						572
Unrealized Losses, 12 months or more						(4)
Obligations of states and political subdivisions [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	63,528			63,528		61,468
Gross Unrealized Gains				866		1,583
Gross Unrealized Losses				42		128
Estimated fair value	64,352			64,352		62,923
Investment securities available for sale:
Estimated fair value, Less than 12 months	2,057			2,057		9,540
Unrealized Losses, Less than 12 months	(7)			(7)		(83)
Estimated fair value, 12 months or more	3,210			3,210		3,578
Unrealized Losses, 12 months or more	(35)			(35)		(45)
Government issued or guaranteed [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	3,391,427			3,391,427		3,777,642
Gross Unrealized Gains				183,529		131,407
Gross Unrealized Losses				58		6,767
Estimated fair value	3,574,898			3,574,898		3,902,282
Investment securities available for sale:
Estimated fair value, Less than 12 months	4,028			4,028		685,319
Unrealized Losses, Less than 12 months	(34)			(34)		(6,460)
Estimated fair value, 12 months or more	2,581			2,581		19,379
Unrealized Losses, 12 months or more	(24)			(24)		(307)
Privately issued residential [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	1,769,795			1,769,795		2,438,353
Gross Unrealized Gains				12,736		9,630
Gross Unrealized Losses				259,163		383,079
Estimated fair value	1,523,368			1,523,368		2,064,904
Investment securities available for sale:
Estimated fair value, Less than 12 months	162,633			162,633		98,312
Unrealized Losses, Less than 12 months	(1,981)			(1,981)		(2,871)
Estimated fair value, 12 months or more	1,143,110			1,143,110		1,504,020
Unrealized Losses, 12 months or more	(257,182)			(257,182)		(380,208)
Privately issued commercial [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	28,116			28,116		33,133
Gross Unrealized Losses				4,636		7,967
Estimated fair value	23,480			23,480		25,166
Investment securities available for sale:
Estimated fair value, 12 months or more	23,480			23,480		25,166
Unrealized Losses, 12 months or more	(4,636)			(4,636)		(7,967)
Collateralized Debt Obligations [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	96,130			96,130		103,159
Gross Unrealized Gains				22,972		23,389
Gross Unrealized Losses				9,760		11,202
Estimated fair value	109,342			109,342		115,346
Investment securities available for sale:
Estimated fair value, Less than 12 months	19,532			19,532		13,046
Unrealized Losses, Less than 12 months	(9,464)			(9,464)		(10,218)
Estimated fair value, 12 months or more	3,593			3,593		3,598
Unrealized Losses, 12 months or more	(296)			(296)		(984)
Other Debt Securities [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	309,095			309,095		309,514
Gross Unrealized Gains				27,325		16,851
Gross Unrealized Losses				42,456		58,164
Estimated fair value	293,964			293,964		268,201
Investment securities available for sale:
Estimated fair value, Less than 12 months	924			924		5,786
Unrealized Losses, Less than 12 months	(1)			(1)		(174)
Estimated fair value, 12 months or more	86,574			86,574		138,705
Unrealized Losses, 12 months or more	(42,455)			(42,455)		(57,990)
Equity Securities [Member]
Investment securities available for sale:
Investment securities, available for sale, amortized cost	120,828			120,828		170,985
Gross Unrealized Gains				5,433		5,590
Gross Unrealized Losses				7,734		15,705
Estimated fair value	118,527			118,527		160,870
Investment securities available for sale:
Estimated fair value, Less than 12 months	5,488			5,488		7,449
Unrealized Losses, Less than 12 months	(3,559)			(3,559)		(1,728)
Estimated fair value, 12 months or more	1,219			1,219		23,159
Unrealized Losses, 12 months or more	$ (4,175)			$ (4,175)		$ (13,977)

Allowance for credit losses (Details) $ in Thousands	3 Months Ended		9 Months Ended
Allowance for credit losses (Details) $ in Thousands	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2009 USD ($)	Dec. 31, 2009 USD ($)
Allowance for credit losses
Beginning balance	$ 894,667	$ 855,365	$ 878,022	$ 787,904
Provision for credit losses	93,000	154,000	283,000	459,000
Consolidation of loan securitization trusts			2,752
Net charge-offs
Charge-offs	(101,782)	(150,150)	(313,167)	(409,169)
Recoveries	8,835	8,659	44,113	30,139
Net charge-offs	(92,947)	(141,491)	(269,054)	(379,030)
Ending balance	894,720	$ 867,874	$ 894,720	$ 867,874
Allowance for credit losses (Textuals) [Abstract]
Duration for loan deliquency (in days)			90
Investment in loans considered impaired	1,100,000		$ 1,100,000		$ 1,300,000
Investment in loans considered impaired without related valuation allowance for impairment	300,000		300,000		234,000
Investment in loans considered impaired with related valuation allowance for impairment	827,000		827,000		1,100,000
Investment in loans considered impaired allowance for impairment	$ 214,000		$ 214,000		$ 244,000

Borrowings (Details) $ in Millions	9 Months Ended
Borrowings (Details) $ in Millions	Sep. 30, 2010 USD ($)	Dec. 31, 2009 USD ($)
Junior Subordinated Debentures [Abstract]
Junior subordinated debentures	$ 1,200
Borrowings (Textuals) [Abstract]
Rate on related Enhanced Trust Preferred Securities	8.50%
Junior Subordinated Debentures retired for which Provident had been the owner of the related Capital Securities	$ 1,200	$ 1,200
Junior Subordinated Debentures Maturity Date	Jan. 31, 2068
Debt Maturity, Start Date	2027
Debt Maturity, End Date	2068
Days prior to repayment redemption or purchase	180
Junior Subordinated Debenture due January 31, 2068 [Member]
Junior Subordinated Debentures [Abstract]
Junior subordinated debentures	$ 350

Stockholders equity (Details)

9 Months Ended

Sep. 30, 2010

USD ($)

$ / shares

Apr. 01, 2011

Dec. 31, 2009

USD ($)

$ / shares

$ 737,979,000

$ 730,235,000

Preferred stock, par value | $

1,000,000

$ 1

Limitation by U.S. Treasury on maximum amount of dividend to be paid per common stock quarterly

$ 1,000

0.70 per share

Series A Fixed Rate Cumulative Perpetual Preferred Stock [Member]

Shares issued and outstanding

^[1]

600,000

^[1]

$ 577,082,000

$ 572,580,000

600,000

Series B Mandatory Convertible Non-cumulative Preferred Stock [Member]

$ 1,000

Shares issued and outstanding

^[2]

26,500

^[2]

$ 26,500,000

26,500,000

26,500

Series C Fixed Rate Cumulative Perpetual Preferred Stock [Member]

$ 1,000

Shares issued and outstanding

^[1],[3]

151,500

^[1],[3]

$ 134,397,000

$ 131,155,000

151,500

Ten Year Warrant Series A Preferred [Member]

$ 1,000

Ten-year warrant to purchase common stock

1,218,522

Ten Year Warrant Series C Preferred [Member]

Ten-year warrant to purchase common stock

407,542

Series A [Member]

Exercise price of each class of warrants or rights outstanding | $

73.86

Series B [Member]

Preferred Stock Dividend Rate

0.1

Number of common shares series B preferred stock will convert into

433,148

Series C [Member]

Exercise price of each class of warrants or rights outstanding | $

55.76

Preferred series A and C first five years [Member]

Preferred Stock Dividend Rate

0.05

Preferred series A and C after five years [Member]

Preferred Stock Dividend Rate

0.09

[1]	Shares were issued as part of the Troubled Asset Relief Program - Capital Purchase Program of the U.S. Department of Treasury ("U.S. Treasury"). Cash proceeds were allocated between the preferred stock and a ten-year warrant to purchase M and T common stock (Series A - 1,218,522 common shares at $73.86 per share, Series C - 407,542 common shares at $55.76 per share). Dividends, if declared, will accrue and be paid quarterly at a rate of 5% per year for the first five years following the original 2008 issuance dates and thereafter at a rate of 9% per year. The agreement with the U.S. Treasury contains limitations on certain actions of M and T, including the payment of quarterly cash dividends on M and T's common stock in excess of $.70 per share, the repurchase of its common stock during the first three years of the agreement, and the amount and nature of compensation arrange ments for certain of the Company's officers.
[2]	Shares were assumed in the Provident acquisition and a new Series B Preferred Stock was designated. In the aggregate, the shares of Series B Preferred Stock will automatically convert into 433,148 shares of M and T common stock on April 1, 2011, but shareholders may elect to convert their preferred shares at any time prior to that date. Dividends, if declared, are payable quarterly in arrears at a rate of 10% per year.
[3]	Shares were assumed in the Provident acquisition and a new Series C Preferred Stock was designated.

Pension plans and other postretirement benefits (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2010	Sep. 30, 2009
Pension plans and other postretirement benefits (Textual) [Abstract]
Defined contribution pension and retirement savings plans total expense	$ 9,461,000	$ 8,061,000	$ 29,926,000	$ 27,166,000
Defined benefit plans [Member]
Net periodic defined benefit cost for defined benefit plans
Service cost	4,918,000	4,935,000	14,753,000	14,548,000
Interest cost on projected benefit obligation	12,031,000	11,910,000	36,092,000	34,189,000
Expected return on plan assets	(12,722,000)	(11,963,000)	(38,165,000)	(35,014,000)
Amortization of prior service cost	(1,640,000)	(1,640,000)	(4,919,000)	(4,919,000)
Amortization of net actuarial loss	3,388,000	2,424,000	10,164,000	7,273,000
Net periodic benefit cost	5,975,000	5,666,000	17,925,000	16,077,000
Other postretirement benefits [Member]
Net periodic defined benefit cost for defined benefit plans
Service cost	101,000	88,000	303,000	265,000
Interest cost on projected benefit obligation	782,000	828,000	2,347,000	2,475,000
Amortization of prior service cost	44,000	61,000	132,000	182,000
Amortization of net actuarial loss	(2,000)	(5,000)	(7,000)	(15,000)
Net periodic benefit cost	$ 925,000	$ 972,000	$ 2,775,000	$ 2,907,000

Earnings per common share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2010

Sep. 30, 2009

Sep. 30, 2010

Sep. 30, 2009

Income available to common stockholders:

Net income

$ 192,015

$ 127,664

$ 531,719

$ 243,073

Less: Preferred stock dividends

^[1]

(10,056)

(30,169)

(26,024)

Amortization of preferred stock discount

^[1]

(2,653)

(2,465)

(7,815)

(5,620)

Net income available to common equity

179,306

115,143

493,735

211,429

Less : Income attributable to unvested stock-based compensation awards

(2,526)

(1,249)

(6,924)

(2,367)

Net income available to common stockholders

$ 176,780

$ 113,894

$ 486,811

$ 209,062

Weighted-average shares outstanding:

Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards

120,010

118,663

119,705

114,843

Less: Unvested stock-based compensation awards

(1,690)

(1,293)

(1,657)

(1,142)

Weighted-average shares outstanding

118,320

117,370

118,048

113,701

Basic earnings per common share

$ 1.49

$ 0.97

$ 4.12

$ 1.84

Computations of diluted earnings per common share

Net income available to common equity

$ 179,306

$ 115,143

$ 493,735

$ 211,429

Less : Income attributable to unvested stock-based compensation awards

(2,517)

(1,249)

(6,904)

(2,367)

Net income available to common stockholders

$ 176,789

$ 113,894

$ 486,831

$ 209,062

Adjusted weighted-average shares outstanding:

Common and unvested stock-based compensation awards

120,010

118,663

119,705

114,843

Less: Unvested stock-based compensation awards

(1,690)

(1,293)

(1,657)

(1,142)

Plus: Incremental shares from assumed conversion of stock-based compensation awards and convertible preferred stock

835

177

718

Adjusted weighted-average shares outstanding

119,155

117,547

118,766

113,800

Diluted earnings per common share

$ 1.48

$ 0.97

$ 4.1

$ 1.84

Earnings per common share (Textuals) [Abstract]

Antidilutive securities excluded from computation of earnings per share

10,700

15,100

11,100

15,100

[1]	Including impact of not as yet declared cumulative dividends.

Comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Comprehensive income (Details) - USD ($) $ in Thousands	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2010	Sep. 30, 2009
Available for sale ("AFS") investment securities with other-than-temporary impairment ("OTTI"):
Securities with OTTI charges during the period, before-tax amount	$ (16,486)	$ (64,232)	$ (67,052)	$ (202,737)
Securities with OTTI charges during the period, income taxes			26,074	79,296
Securities with OTTI charges during the period, net			(40,978)	(123,441)
Net OTTI losses recognized in earnings	(9,532)	(47,033)	(58,714)	(104,001)
Less: OTTI charges recognized in net income, income taxes			22,758	40,662
Less: OTTI charges recognized in net income, net			(35,956)	(63,339)
Net unrealized losses on investment securities with OTTI, before-tax amount	(6,954)	(17,199)	(8,338)	(98,736)
Net unrealized losses on investment securities with OTTI, income taxes			3,316	38,634
Net unrealized losses on investment securities with OTTI, net			(5,022)	(60,102)
AFS investment securities - all other:
Unrealized holding gains/losses during period, before-tax amount			166,122	389,609
Unrealized holding gains/losses during period, income taxes			(64,944)	(149,651)
Unrealized holding gains/losses during period, net			101,178	239,958
Less: Reclassification adjustment for losses realized in net income, before-tax amount			1,023	(135)
Less: Reclassification adjustment for losses realized in net income, income taxes			(392)	54
Less: Reclassification adjustment for losses realized in net income, net			631	(81)
Securities with OTTI charges during the period, before-tax amount	(16,486)	(64,232)	(67,052)	(202,737)
Securities with OTTI charges during the period, income taxes			26,074	79,296
Securities with OTTI charges during the period, net			(40,978)	(123,441)
Total AFS investment securities-all other, before-tax amount			232,151	592,481
Total AFS investment securities-all other, income taxes			(90,626)	(229,001)
Total AFS investment securities-all other, net			141,525	363,480
Reclassification of unrealized holding losses to income during period on Investment securities previously transferred from AFS to HTM, before tax amount			6,400	7,955
Reclassification of unrealized holding losses to income during period on Investment securities previously transferred from AFS to HTM, tax			(2,511)	(2,183)
Reclassification of unrealized holding losses to income during period on Investment securities previously transferred from AFS to HTM, net of tax			3,889	5,772
Net unrealized gains/losses on investment securities, before-tax amount			230,213	501,700
Net unrealized gains/losses on investment securities, income taxes			(89,821)	(192,550)
Unrealized gains on investment securities			140,392	309,150
Reclassification of gains (losses) on terminated cash flow hedges to income, before-tax amount			(336)	10,873
Reclassification of gains (losses) on terminated cash flow hedges to income, income taxes			125	(4,246)
Reclassification of gains (losses) on terminated cash flow hedges to income, net			(211)	6,627
Defined benefit plans liability adjustment, before-tax amount			5,370	2,521
Defined benefit plans liability adjustment, income taxes			(2,108)	(703)
Defined benefit plans liability adjustment, net			3,262	1,818
Total Comprehensive Income, before-tax amount			235,247	515,094
Total Comprehensive Income, income taxes			(91,804)	(197,499)
Total Comprehensive Income, net			143,443	317,595
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance			(335,997)	(736,881)
Net gain (loss) during period			143,443	317,595
Ending Balance	(192,554)	(419,286)	(192,554)	(419,286)
Cash flow hedges [Member]
AFS investment securities - all other:
Total Comprehensive Income, net			(211)	6,627
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance			674	(5,883)
Net gain (loss) during period			(211)	6,627
Ending Balance	463	744	463	744
Defined benefit plans [Member]
AFS investment securities - all other:
Total Comprehensive Income, net			3,262	1,818
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance			(117,046)	(174,330)
Net gain (loss) during period			3,262	1,818
Ending Balance	(113,784)	(172,512)	(113,784)	(172,512)
With OTTI [Member]
AFS investment securities - all other:
Total Comprehensive Income, net			(5,022)	(60,102)
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance			(76,772)
Net gain (loss) during period			(5,022)	(60,102)
Ending Balance	(81,794)	(60,102)	(81,794)	(60,102)
All other [Member]
AFS investment securities - all other:
Total Comprehensive Income, net			145,414	369,252
Accumulated other comprehensive income (loss), net consisted of unrealized gains (losses)
Beginning Balance			(142,853)	(556,668)
Net gain (loss) during period			145,414	369,252
Ending Balance	$ 2,561	$ (187,416)	$ 2,561	$ (187,416)

Derivative financial instruments (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2010

Sep. 30, 2009

Sep. 30, 2010

Sep. 30, 2009

Dec. 31, 2009

Derivative financial instruments (Textuals) [Abstract]

Notional value of foreign currency and other option and future contracts entered into trading purposes

$ 622,000

$ 608,000

Information about fair values of derivative instruments in consolidated balance sheet

Derivative asset designated as hedging instrument, fair value

140,124

60,495

Derivative asset not designated as hedging instrument, fair value

475,243

347,280

Derivative liability not designated as hedging instrument, fair value

434,127

308,066

Derivative liability designated as hedging instrument, fair value

2,945

171

Information about fair values of derivative instruments in consolidated balance sheet continued

Total derivative asset, fair value

615,367

407,775

Total derivative liability, fair value

437,072

308,237

Information about fair values of derivative instruments in consolidated statement of income

Derivatives in fair value hedging relationships, derivatives

28,281

$ 19,132

84,205

$ (63,979)

Derivatives in fair value hedging relationships, hedged item

(27,116)

(18,216)

(80,324)

59,996

Derivatives not designated as hedging instruments, derivatives

(719)

(817)

(880)

(1,242)

Additonal Derivative financial instruments (Textuals) [Abstract]

Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans

34,000

20,000

Aggregate fair value of derivative financial instruments in a net liability position

302,000

Fair value of collateral posted for derivative financial instruments

298,000

Interest rate swap counterparty collateral postings

80,000

Interest rate swap agreements [Member]

Information about fair values of derivative instruments in consolidated balance sheet

Derivative asset designated as hedging instrument, fair value

^[1]

139,718

54,486

Derivative liability designated as hedging instrument, fair value

^[1]

Commitments to sell real estate loans [Member]

Information about fair values of derivative instruments in consolidated balance sheet

Derivative asset designated as hedging instrument, fair value

^[1]

406

6,009

Derivative asset not designated as hedging instrument, fair value

^[1]

721

13,293

Derivative liability not designated as hedging instrument, fair value

^[1]

8,906

1,360

Derivative liability designated as hedging instrument, fair value

^[1]

2,945

171

Information about fair values of derivative instruments in consolidated balance sheet

Derivative asset not designated as hedging instrument, fair value

^[1]

26,554

4,428

Derivative liability not designated as hedging instrument, fair value

^[1]

137

4,508

Interest rate contracts [Member]

Information about fair values of derivative instruments in consolidated balance sheet

Derivative asset not designated as hedging instrument, fair value

^[2]

439,386

317,651

Derivative liability not designated as hedging instrument, fair value

^[2]

415,741

290,104

Foreign exchange and other option and futures contracts [Member]

Information about fair values of derivative instruments in consolidated balance sheet

Derivative asset not designated as hedging instrument, fair value

^[2]

8,582

11,908

Derivative liability not designated as hedging instrument, fair value

^[2]

9,343

12,094

Fair value hedges [Member]

Information about interest rate swap agreements

Notional amount

$ 1,062,241

Average maturity (in years)

6.4

Weighted-average rate, fixed

6.30%

Weighted-average rate, variable

2.07%

Fair value hedges [Member] | Fixed rate time deposits [Member]

Information about interest rate swap agreements

Notional amount

^[3]

$ 25,000

Average maturity (in years)

^[3]

3.7

Weighted-average rate, fixed

^[3]

5.30%

Weighted-average rate, variable

^[3]

0.34%

Fair value hedges [Member] | Fixed rate long-term borrowings [Member]

Information about interest rate swap agreements

Notional amount

^[3]

$ 1,037,241

Average maturity (in years)

^[3]

5.7

6.5

Weighted-average rate, fixed

^[3]

6.33%

Weighted-average rate, variable

^[3]

2.18%

2.12%

Interest rate swap agreements [Member]

Derivative financial instruments (Textuals) [Abstract]

Increase in net interest income due to Interest Rate Swap agreements

$ 10,000

$ 32,000

$ 27,000

Interest rate contracts [Member]

Derivative financial instruments (Textuals) [Abstract]

Notional value of interest rate contracts entered into trading purposes

$ 12,600,000

$ 13,900,000

[1]	Asset derivatives are reported in other assets and liability derivatives are reported in other liabilities.
[2]	Asset derivatives are reported in trading account assets and liability derivatives are reported in other liabilities.
[3]	Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate.

Variable interest entities and asset securitizations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	24 Months Ended
	Jun. 30, 2010	Mar. 31, 2009	Sep. 30, 2010	Dec. 31, 2003	Dec. 31, 2009
Variable interest entities and asset securitizations (Textuals) [Abstract]
Securitization and transfer of residential mortgage loans to qualified special purpose trusts				$ 1,900
Maximum Percentage of cash received on securitization of residential mortgage loans allocated to capitalized servicing rights			88.00%
Increase in loans receivable due to amended consolidation rules					$ 424
Decrease in amortized cost of available-for-sale investment securities due to amended consolidation rules					360
Decrease in Fair Value of available-for-sale investment securities due to amended consolidation rules					355
Increase in borrowings due to amended consolidation rules					$ 65
Carrying value of loans in the securitization trusts			$ 283
Combined outstanding principal amount of mortgage-backed securities issued by the qualified special purpose trusts			290
Principal amount of mortgage-backed securities held by the company			247
Carrying value of the mortgage-backed securities outstanding to third parties			$ 43
Residential mortgage loans securitized with Fannie Mae		$ 141
Number of ADS included in investment securities available for sale			591,813		591,813
Carrying Value of ADSs included in investment securities available for sale			$ 1		$ 2
Outstanding options granted to current employees related to ADS			138,800		189,450
Last expiration date of ADS related options			Oct. 01, 2011
Fair Value of ADSs included into investment securities available for sale			$ 1
Pre-tax other than temporary impairment losses related to ADSs	$ 12
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			1,000		$ 1,000
Maximum exposure to loss of investments in real estate partnerships			246		246
Unfunded commitments included in company's maximum exposure to loss of investments in real estate partnerships			$ 75		$ 89

Fair value measurements (Details)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2010

USD ($)

Sep. 30, 2009

USD ($)

Sep. 30, 2010

USD ($)

Sep. 30, 2009

USD ($)

Jun. 30, 2010

USD ($)

Dec. 31, 2009

USD ($)

Jun. 30, 2009

USD ($)

Dec. 31, 2008

USD ($)

Assets measured at estimated fair value on a recurring basis

$ 536,702

$ 386,984

5,783,496

6,704,378

656,888

652,761

^[1]

167,399

78,216

Liabilities measured at estimated fair value on a recurring basis

7,144,485

7,822,339

425,084

302,198

^[1]

11,988

6,039

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

437,072

308,237

1,742,716

$ 2,392,445

2,205,836

$ 2,462,512

Included in earnings

(9,532)

(46,780)

(46,721)

(102,801)

30,673

181,239

157,857

401,140

(107,667)

(172,301)

(305,079)

(328,315)

(450)

(355,703)

^[2]

(78,383)

Changes in unrealized gains (losses) included in earnings related to assets still held at end of period

1,656,190

2,354,153

1,656,190

2,354,153

(9,532)

(46,780)

(46,721)

(102,801)

Beginning Balance of other assets and other liabilities

20,843

9,676

(80)

8,266

Included In Earnings of other assets and other liabilities

38,339

^[3]

16,195

^[3]

86,249

^[4]

35,685

^[4]

Transfer in and/or out of Level 3 of other assets and other liabilities

(32,825)

(11,951)

(59,752)

^[2]

(30,031)

Ending Balance of other assets and other liabilities

26,417

13,920

26,417

13,920

Changes in unrealized gains (losses) included in earnings related to other assets and other liabilities still held at end of period

23,910

^[3]

13,148

^[3]

26,326

^[4]

16,444

^[4]

Financial assets:

Cash and cash equivalents

1,089,325

1,373,714

1,089,325

1,373,714

1,246,342

$ 1,568,151

Interest-bearing deposits at banks

401,624

133,335

Agreements to resell securities

425,000

536,702

386,984

7,662,715

7,780,609

Loans and leases:

Noninterest-bearing deposits

(894,720)

(867,874)

(894,720)

(867,874)

$ (894,667)

(878,022)

$ (855,365)

$ (787,904)

Loans and leases, net

49,896,838

51,058,664

Financial liabilities:

14,665,603

13,794,636

Time deposits

6,119,516

7,531,495

Deposits at foreign office

653,916

1,050,438

Long-term borrowings

8,991,508

10,240,016

Fair value assets and liabilities measured on nonrecurring basis (Textual) [Abstract]

Loans measured at fair value on nonrecurring basis

$ 625,000

828,000

$ 625,000

828,000

Fair Value Measurements (Textuals) [Abstract]

Amount of available-for-sale investment securities derecognized due to adoption of new accounting rules

355,000

Number of privately issued residential mortgage backed securities valued with internal modeling

144

Privately issued residential mortgage-backed securities with internal modeling, at cost

$ 1,600,000

Number of independent pricing sources

Minimum range of Weightings applied to internal model valuations, in percentage

0.00%

Maximum range of Weightings applied to internal model valuations, in percentage

40.00%

Weighted-average reliance on internal model pricing, in percentage

37.00%

Average weighting placed on the values provided by the independent sources, in percentage

63.00%

Fair value of privately issued residential mortgage-backed securities valued with internal modeling

1,400,000

$ 1,400,000

Weighted-average market yield

8.25%

Securities issued by financial institutions and other entities backed by trust preferred securities at cost

96,000

$ 96,000

Fair value of securities issued by financial institutions and other entities backed by trust preferred securities

109,000

Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves

61,000

136,000

154,000

292,000

Carrying value of capitalized servicing rights

33,000

28,000

33,000

28,000

Increases (decreases) in fair value of capitalized servicing rights

(3,000)

(6,000)

18,000

Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis

160,000

38,000

160,000

38,000

Change in fair value of nonrecurring fair value measured foreclosed assets

19,000

4,000

34,000

25,000

U.S. Treasury and federal agencies [Member]

Assets measured at estimated fair value on a recurring basis

Obligations of states and political subdivisions [Member]

75,565

104,686

Assets measured at estimated fair value on a recurring basis

Government issued or guaranteed [Member]

64,352

62,923

Assets measured at estimated fair value on a recurring basis

Privately issued residential [Member]

3,574,898

3,902,282

Assets measured at estimated fair value on a recurring basis

Privately issued commercial [Member]

1,523,368

2,064,904

Assets measured at estimated fair value on a recurring basis

Collateralized Debt Obligations [Member]

23,480

25,166

Assets measured at estimated fair value on a recurring basis

Other Debt Securities [Member]

109,342

115,346

Assets measured at estimated fair value on a recurring basis

Equity Securities [Member]

293,964

268,201

Assets measured at estimated fair value on a recurring basis

Cash and cash equivalents

118,527

160,870

Carrying Amount [Member]

Financial assets:

1,089,325

1,246,342

Interest-bearing deposits at banks

401,624

133,335

Agreements to resell securities

425,000

536,702

386,984

Commercial loans and leases

7,662,715

7,780,609

Loans and leases:

12,788,136

13,479,447

Commercial real estate loans

20,580,450

20,949,931

Residential real estate loans

5,754,432

5,463,463

Consumer loans

11,668,540

12,043,845

Accrued interest receivable

(894,720)

(878,022)

Loans and leases, net

49,896,838

51,058,664

224,475

214,692

Financial liabilities:

Noninterest-bearing deposits

(14,665,603)

(13,794,636)

Savings Deposits And NOW Accounts

(27,215,588)

(25,073,269)

Time deposits

(6,119,516)

(7,531,495)

Deposits at foreign office

(653,916)

(1,050,438)

Other short term borrowings

(1,211,683)

(2,442,582)

Long-term borrowings

(8,991,508)

(10,240,016)

Accrued interest payable

(110,013)

(94,838)

Commitments to originate real estate loans for sale

(425,084)

(302,198)

Other financial instruments:

26,417

(80)

Commitments to sell real estate loans

(10,724)

17,771

Other credit-related commitments

(51,515)

(55,954)

Interest rate swap agreements used for interest rate risk management

139,718

54,486

Calculated Estimate [Member]

Financial assets:

Cash and cash equivalents

1,089,325

1,246,342

Interest-bearing deposits at banks

401,624

133,335

Agreements to resell securities

425,000

536,702

386,984

Commercial loans and leases

7,575,042

7,629,485

Loans and leases:

12,494,338

13,090,206

Commercial real estate loans

20,258,451

20,426,273

Residential real estate loans

5,556,767

5,058,763

Consumer loans

11,333,568

11,575,525

Accrued interest receivable

Loans and leases, net

49,643,124

50,150,767

224,475

214,692

Financial liabilities:

Noninterest-bearing deposits

(14,665,603)

(13,794,636)

Savings Deposits And NOW Accounts

(27,215,588)

(25,073,269)

Time deposits

(6,171,627)

(7,592,214)

Deposits at foreign office

(653,916)

(1,050,438)

Other short term borrowings

(1,211,683)

(2,442,582)

Long-term borrowings

(9,118,366)

(9,822,153)

Accrued interest payable

(110,013)

(94,838)

Commitments to originate real estate loans for sale

(425,084)

(302,198)

Other financial instruments:

26,417

(80)

Commitments to sell real estate loans

(10,724)

17,771

Other credit-related commitments

(51,515)

(55,954)

Interest rate swap agreements used for interest rate risk management

139,718

54,486

Level 1 [Member]

Liabilities measured at estimated fair value on a recurring basis

5,577

^[1]

Liabilities measured at estimated fair value on a recurring basis

5,577

Level 2 [Member]

425,084

^[5]

425,084

^[5]

296,621

^[1]

11,851

^[5]

11,851

^[5]

1,531

Liabilities measured at estimated fair value on a recurring basis

436,935

^[5]

436,935

^[5]

298,152

Level 3 [Member]

^[1]

137

4,508

Fair value assets and liabilities measured on nonrecurring basis (Textual) [Abstract]

137

4,508

Level 2 [Member]

Loans measured at fair value on nonrecurring basis

373,000

301,000

373,000

301,000

Level 3 [Member]

Fair value assets and liabilities measured on nonrecurring basis (Textual) [Abstract]

Loans measured at fair value on nonrecurring basis

252,000

527,000

252,000

527,000

U.S. Treasury and federal agencies [Member]

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

5,532

(5,532)

Obligations of states and political subdivisions [Member]

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

12,203

132

154

12,143

Collateralized Debt Obligations [Member]

12,335

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

118,040

112,372

115,346

2,496

Included in earnings

(2,857)

^[6]

(2,502)

^[7]

(5,703)

^[7]

(4,055)

^[7]

(5,592)

19,205

215

32,917

(249)

2,262

(516)

99,979

Changes in unrealized gains (losses) included in earnings related to assets still held at end of period

109,342

131,337

109,342

131,337

(2,857)

^[6]

(2,502)

^[7]

(5,703)

^[7]

(4,055)

^[7]

Other Debt Securities [Member]

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

765

420

110

725

(450)

(455)

^[2]

(450)

Equity Securities [Member]

385

Changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis

2,329

2,302

(12)

Assets measured at estimated fair value on a recurring basis

$ 2,318

Level 1 [Member]

49,528

40,836

108,373

145,817

^[1]

Level 1 [Member] | U.S. Treasury and federal agencies [Member]

157,901

186,653

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Obligations of states and political subdivisions [Member]

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Government issued or guaranteed [Member]

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Privately issued residential [Member]

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Privately issued commercial [Member]

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Collateralized Debt Obligations [Member]

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Other Debt Securities [Member]

Assets measured at estimated fair value on a recurring basis

Level 1 [Member] | Equity Securities [Member]

Assets measured at estimated fair value on a recurring basis

Assets measured at estimated fair value on a recurring basis

108,373

145,817

Level 2 [Member]

487,174

^[5]

487,174

^[5]

346,148

4,018,933

^[5]

4,018,933

^[5]

4,352,725

656,888

^[5]

656,888

^[5]

652,761

^[1]

140,845

^[5]

140,845

^[5]

73,788

Level 2 [Member] | U.S. Treasury and federal agencies [Member]

5,303,840

^[5]

5,303,840

^[5]

5,425,422

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Obligations of states and political subdivisions [Member]

75,565

^[5]

75,565

^[5]

104,686

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Government issued or guaranteed [Member]

64,352

^[5]

64,352

^[5]

62,923

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Privately issued residential [Member]

3,574,898

^[5]

3,574,898

^[5]

3,902,282

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Privately issued commercial [Member]

^[5]

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Collateralized Debt Obligations [Member]

^[5]

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Other Debt Securities [Member]

^[5]

Assets measured at estimated fair value on a recurring basis

Level 2 [Member] | Equity Securities [Member]

293,964

^[5]

293,964

^[5]

267,781

Assets measured at estimated fair value on a recurring basis

Assets measured at estimated fair value on a recurring basis

10,154

^[5]

10,154

^[5]

15,053

Level 3 [Member]

1,656,190

2,205,836

^[1]

26,554

4,428

Level 3 [Member] | U.S. Treasury and federal agencies [Member]

1,682,744

2,210,264

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Obligations of states and political subdivisions [Member]

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Government issued or guaranteed [Member]

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Privately issued residential [Member]

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Privately issued commercial [Member]

1,523,368

2,064,904

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Collateralized Debt Obligations [Member]

23,480

25,166

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Other Debt Securities [Member]

109,342

115,346

Assets measured at estimated fair value on a recurring basis

Level 3 [Member] | Equity Securities [Member]

420

Assets measured at estimated fair value on a recurring basis

$ 0

[1]	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).
[2]	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.
[3]	Reported as mortgage banking revenues in the consolidated statement of income and includes the fair value of commitment issuances and expirations.
[4]	Reported as mortgage banking revenues in the consolidated statement of income and includes the fair value of commitment issuances and expirations.
[5]	There were no significant transfers between Level 1 and Level 2 of the fair value hierarchy during the three and nine months ended September 30, 2010.
[6]	Reported as an other-than-temporary impairment loss in the consolidated statement of income or as gain (loss) on bank investment securities.
[7]	Reported as an other-than-temporary impairment loss in the consolidated statement of income or as gain (loss) on bank investment securities.

Commitments and contingencies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2010	Dec. 31, 2009
Commitments to extend credit
Home equity lines of credit	$ 6,346,123	$ 6,482,987
Commercial real estate loans to be sold	157,952	180,498
Other commercial real estate and construction	1,501,564	1,360,805
Residential real estate loans to be sold	930,160	631,090
Other residential real estate	217,352	127,788
Commercial and other	7,731,120	7,155,188
Standby letters of credit	3,779,166	3,828,586
Commercial letters of credit	72,191	66,377
Financial guarantees and indemnification contracts	1,521,275	1,633,549
Commitments to sell real estate loans	1,375,705	1,239,001
Commitments and contingencies (Textuals) [Abstract]
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program	1,500,000	$ 1,300,000
Outstanding loan principal balances reinsured	89,000
Assets of subsidiaries providing reinsurance to satisfy claims	74,000
2010 - 2013 [Member]
Company's significant commitments
Naming rights of football stadium per year	5,000
2014 - 2017 [Member]
Company's significant commitments
Naming rights of football stadium per year	$ 6,000

Segment information (Details) - USD ($)

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2010

Sep. 30, 2009

Sep. 30, 2010

Sep. 30, 2009

Dec. 31, 2009

^[1]

$ 859,767,000

$ 825,881,000

$ 2,514,591,000

$ 2,279,245,000

192,015,000

127,664,000

531,719,000

243,073,000

Segment information (Textuals) [Abstract]

68,339,000,000

66,984,000,000

$ 67,472,000,000

Taxable Equivalent Adjustment

5,865,000

5,795,000

17,893,000

15,942,000

Business Banking [Member]

^[1]

103,475,000

108,744,000

307,881,000

305,511,000

290,000

24,295,000

33,707,000

76,191,000

94,518,000

Commercial Banking [Member]

4,850,000,000

4,821,000,000

4,869,000,000

^[1]

199,139,000

183,407,000

586,120,000

535,092,000

282,000

71,567,000

41,158,000

230,047,000

168,315,000

Commercial Real Estate [Member]

15,460,000,000

15,451,000,000

15,399,000,000

^[1]

118,666,000

107,524,000

338,566,000

297,335,000

104,000

14,000

161,000

53,000

53,727,000

42,229,000

141,147,000

108,669,000

Discretionary Portfolio [Member]

13,198,000,000

12,563,000,000

12,842,000,000

^[1]

12,493,000

1,346,000

5,840,000

29,077,000

(2,733,000)

(2,894,000)

(7,980,000)

(9,671,000)

(2,759,000)

(10,496,000)

(22,994,000)

(18,864,000)

Residential Mortgage Banking [Member]

14,658,000,000

13,642,000,000

13,763,000,000

^[1]

73,744,000

74,336,000

202,627,000

234,363,000

9,419,000

11,170,000

26,492,000

38,041,000

9,408,000

1,209,000

9,536,000

(4,168,000)

2,189,000,000

2,619,000,000

2,522,000,000

Retail Banking [Member]

^[1]

302,656,000

336,049,000

925,769,000

933,726,000

2,632,000

2,902,000

8,009,000

8,066,000

55,572,000

74,043,000

181,689,000

180,590,000

12,133,000,000

11,862,000,000

12,024,000,000

All Other [Member]

^[1]

49,594,000

14,475,000

147,788,000

(55,859,000)

(9,994,000)

(11,192,000)

(27,254,000)

(36,489,000)

$ (19,795,000)

$ (54,186,000)

(83,897,000)

(285,987,000)