0001564590-21-041556 | 10-Q | XBRL Viewer

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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2021	Jul. 30, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Trading Symbol	MTB
Entity Registrant Name	M&T BANK CORPORATION
Entity Central Index Key	0000036270
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		128,677,826
Entity File Number	1-9861
Entity Tax Identification Number	16-0968385
Entity Incorporation, State or Country Code	NY
Title of 12(b) Security	Common Stock, $.50 par value
Security Exchange Name	NYSE
Entity Address, Address Line One	One M & T Plaza
Entity Address, Postal Zip Code	14203
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
City Area Code	716
Local Phone Number	635-4000
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 1,410,468	$ 1,552,743
Interest-bearing deposits at banks	33,864,824	23,663,810
Trading account	712,558	1,068,581
Investment securities (includes pledged securities that can be sold or repledged of $117,382 at June 30, 2021; $105,136 at December 31, 2020)
Available for sale (cost: $3,801,940 at June 30, 2021; $4,621,027 at December 31, 2020	3,959,783	4,822,606
Held to maturity (fair value: $1,785,014 at June 30, 2021; $1,842,281 at December 31, 2020)	1,718,198	1,748,989
Equity and other securities (cost: $463,043 at June 30, 2021; $449,008 at December 31, 2020)	465,196	474,102
Total investment securities	6,143,177	7,045,697
Loans and leases	97,487,955	98,875,788
Unearned discount	(374,523)	(339,921)
Loans and leases, net of unearned discount	97,113,432	98,535,867
Allowance for credit losses	(1,575,128)	(1,736,387)
Loans and leases, net	95,538,304	96,799,480
Premises and equipment	1,116,703	1,161,558
Goodwill	4,593,112	4,593,112
Core deposit and other intangible assets	8,690	14,165
Accrued interest and other assets	7,234,871	6,701,959
Total assets	150,622,707	142,601,105
Liabilities
Noninterest-bearing deposits	55,621,230	47,572,884
Savings and interest-checking deposits	69,491,942	67,680,840
Time deposits	3,155,600	3,899,910
Deposits at Cayman Islands office		652,104
Total deposits	128,268,772	119,805,738
Short-term borrowings	91,235	59,482
Accrued interest and other liabilities	2,042,948	2,166,409
Long-term borrowings	3,499,448	4,382,193
Total liabilities	133,902,403	126,413,822
Shareholders' equity
Preferred stock, $1.00 par, 1,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 350,000 shares at June 30, 2021 and December 31, 2020; Liquidation preference of $10,000 per share: 90,000 shares at June 30, 2021 and December 31, 2020	1,250,000	1,250,000
Common stock, $.50 par, 250,000,000 shares authorized, 159,741,898 shares issued at June 30, 2021 and December 31, 2020	79,871	79,871
Common stock issuable, 15,568 shares at June 30, 2021; 18,113 shares at December 31, 2020	1,179	1,344
Additional paid-in capital	6,620,528	6,617,404
Retained earnings	14,030,215	13,444,428
Accumulated other comprehensive income (loss), net	(176,974)	(63,032)
Treasury stock — common, at cost — 31,070,980 shares at June 30, 2021; 31,426,742 shares at December 31, 2020	(5,084,515)	(5,142,732)
Total shareholders’ equity	16,720,304	16,187,283
Total liabilities and shareholders’ equity	$ 150,622,707	$ 142,601,105

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Pledged securities that can be sold or repledged	$ 117,382	$ 105,136
Investment securities, available for sale, amortized cost	3,801,940	4,621,027
Investment securities, held to maturity, fair value	1,785,014	1,842,281
Equity and other securities, cost	$ 463,043	$ 449,008
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	1,000,000	1,000,000
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	159,741,898	159,741,898
Common stock issuable, shares	15,568	18,113
Treasury stock, common shares	31,070,980	31,426,742
Series A Series C Series And E Preferred Stock [Member]
Preferred stock, shares issued	350,000	350,000
Preferred stock, shares outstanding	350,000	350,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Series F And Series G Preferred Stock [Member]
Preferred stock, shares issued	90,000	90,000
Preferred stock, shares outstanding	90,000	90,000
Preferred stock, liquidation preference per share	$ 10,000	$ 10,000

Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest income
Loans and leases, including fees	$ 926,965	$ 980,372	$ 1,899,547	$ 2,027,193
Investment securities
Fully taxable	34,456	47,219	71,527	97,329
Exempt from federal taxes	10	29	65	104
Deposits at banks	8,710	4,179	15,584	23,145
Other	217	443	597	4,890
Total interest income	970,358	1,032,242	1,987,320	2,152,661
Interest expense
Savings and interest-checking deposits	8,052	26,454	19,556	104,456
Time deposits	5,084	19,883	12,094	41,755
Deposits at Cayman Islands office	16	161	201	3,580
Short-term borrowings	1	2	3	25
Long-term borrowings	14,865	28,605	31,731	68,903
Total interest expense	28,018	75,105	63,585	218,719
Net interest income	942,340	957,137	1,923,735	1,933,942
Provision for credit losses	(15,000)	325,000	(40,000)	575,000
Net interest income after provision for credit losses	957,340	632,137	1,963,735	1,358,942
Other income
Brokerage services income	10,265	10,463	23,378	23,592
Trading account and foreign exchange gains	6,502	8,290	12,786	29,306
Gain (loss) on bank investment securities	(10,655)	6,969	(22,937)	(13,813)
Other revenues from operations	112,699	87,190	223,629	220,366
Total other income	513,633	487,273	1,019,231	1,016,633
Other expense
Salaries and employee benefits	479,134	458,842	1,020,212	995,685
Equipment and net occupancy	80,848	77,089	163,319	156,729
Outside data processing and software	74,492	61,376	140,243	125,786
FDIC assessments	17,876	14,207	32,064	26,478
Advertising and marketing	13,364	9,842	27,992	32,217
Printing, postage and supplies	11,133	11,260	20,450	22,112
Amortization of core deposit and other intangible assets	2,737	3,913	5,475	7,826
Other costs of operations	185,761	170,513	375,034	346,625
Total other expense	865,345	807,042	1,784,789	1,713,458
Income before taxes	605,628	312,368	1,198,177	662,117
Income taxes	147,559	71,314	292,859	152,241
Net income	458,069	241,054	905,318	509,876
Net income available to common shareholders
Basic	438,756	223,098	866,848	473,794
Diluted	$ 438,759	$ 223,099	$ 866,852	$ 473,795
Net income per common share
Basic	$ 3.41	$ 1.74	$ 6.74	$ 3.67
Diluted	$ 3.41	$ 1.74	$ 6.73	$ 3.67
Average common shares outstanding
Basic	128,671	128,275	128,604	128,986
Diluted	128,842	128,333	128,756	129,044
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 133,313	$ 145,024	$ 272,067	$ 272,933
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	98,518	77,455	191,295	183,616
Trust Income [Member]
Other income
Revenue from contract with customer	$ 162,991	$ 151,882	$ 319,013	$ 300,633

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Partners Capital [Abstract]
Net income	$ 458,069	$ 241,054	$ 905,318	$ 509,876
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	(8,088)	34,951	(30,494)	132,399
Cash flow hedges adjustments	(47,360)	(8,959)	(114,137)	303,761
Foreign currency translation adjustments	145	(51)	693	(2,994)
Defined benefit plans liability adjustments	16,807	8,856	29,996	18,144
Total other comprehensive income (loss)	(38,496)	34,797	(113,942)	451,310
Total comprehensive income	$ 419,573	$ 275,851	$ 791,376	$ 961,186

- Definition

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

+ References

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+ Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 905,318	$ 509,876
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	(40,000)	575,000
Depreciation and amortization of premises and equipment	113,459	108,748
Amortization of capitalized servicing rights	40,147	37,971
Amortization of core deposit and other intangible assets	5,475	7,826
Provision for deferred income taxes	55,153	(90,093)
Asset write-downs	3,243	15,626
Net gain on sales of assets	(12,845)	(5,808)
Net change in accrued interest receivable, payable	(1,048)	(48,790)
Net change in other accrued income and expense	(50,200)	6,403
Net change in loans originated for sale	172,617	(220,368)
Net change in trading account assets and liabilities	340,392	(765,314)
Net cash provided by operating activities	1,531,711	131,077
Cash flows from investing activities
Proceeds from sales of investment securities equity and other	5,268	54,232
Proceeds from maturities of investment securities Available for sale	811,795	662,253
Proceeds from maturities of investment securities Held to maturity	335,976	502,093
Purchases of investment securities Available for sale	(2,137)	(4,052)
Purchases of investment securities Held to maturity	(305,633)	(8,995)
Purchases of investment securities equity and other	(19,299)	(20,575)
Net (increase) decrease in loans and leases	1,172,249	(6,713,727)
Net increase in interest-bearing deposits at banks	(10,201,014)	(13,698,187)
Capital expenditures, net	(44,459)	(93,651)
Net (increase) decrease in loan servicing advances	(417,629)	178,984
Other, net	(317,489)	197,377
Net cash used by investing activities	(8,982,372)	(18,944,248)
Cash flows from financing activities
Net increase in deposits	8,463,034	20,199,033
Net increase (decrease) in short-term borrowings	31,753	(10,065)
Payments on long-term borrowings	(852,992)	(754,425)
Purchases of treasury stock		(373,750)
Dividends paid — common	(283,791)	(284,690)
Dividends paid — preferred	(34,100)	(34,156)
Other, net	(15,518)	(10,266)
Net cash provided by financing activities	7,308,386	18,731,681
Net decrease in cash, cash equivalents and restricted cash	(142,275)	(81,490)
Cash, cash equivalents and restricted cash at beginning of period	1,552,743	1,436,305
Cash, cash equivalents and restricted cash at end of period	1,410,468	1,354,815
Supplemental disclosure of cash flow information
Interest received during the period	1,976,059	2,156,881
Interest paid during the period	79,841	223,874
Income taxes paid during the period	204,259	61,759
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	3,968	17,885
Additions to right-of-use assets under operating leases	$ 18,182	$ 30,585

Consolidated Statement of Changes in Shareholders' Equity - USD ($)
$ in Thousands

Total

ASU 2016-13 [Member]

Preferred Stock [Member]

Common Stock [Member]

Common Stock Issuable [Member]

Additional Paid-in Capital [Member]

Retained Earnings [Member]

ASU 2016-13 [Member]

Accumulated Other Comprehensive Income (Loss), Net [Member]

Treasury Stock [Member]

Beginning balance at Dec. 31, 2019

$ 15,716,649

$ 1,250,000

$ 79,871

$ 1,566

$ 6,593,539

$ 12,820,916

$ (206,680)

$ (4,822,563)

Adoption of new accounting standard for credit losses

$ (91,925)

Total comprehensive income

961,186

509,876

451,310

Preferred stock cash dividends

^[1]

(34,128)

Purchases of treasury stock

(373,750)

Stock-based compensation transactions, net

52,261

(258)

5,530

(206)

47,195

Common stock cash dividends

(285,188)

Ending balance at Jun. 30, 2020

15,945,105

1,250,000

79,871

1,308

6,599,069

12,919,345

244,630

(5,149,118)

Beginning balance at Mar. 31, 2020

15,815,794

1,250,000

79,871

1,292

6,588,407

12,837,390

209,833

(5,150,999)

Total comprehensive income

275,851

241,054

34,797

Preferred stock cash dividends

^[1]

(17,050)

Stock-based compensation transactions, net

12,455

10,662

(104)

1,881

Common stock cash dividends

(141,945)

Ending balance at Jun. 30, 2020

15,945,105

1,250,000

79,871

1,308

6,599,069

12,919,345

244,630

(5,149,118)

Beginning balance at Dec. 31, 2020

16,187,283

1,250,000

79,871

1,344

6,617,404

13,444,428

(63,032)

(5,142,732)

Total comprehensive income

791,376

905,318

(113,942)

Preferred stock cash dividends

^[1]

(34,100)

Stock-based compensation transactions, net

60,767

(165)

3,124

(409)

58,217

Common stock cash dividends

(285,022)

Ending balance at Jun. 30, 2021

16,720,304

1,250,000

79,871

1,179

6,620,528

14,030,215

(176,974)

(5,084,515)

Beginning balance at Mar. 31, 2021

16,446,508

1,250,000

79,871

1,165

6,611,150

13,731,893

(138,478)

(5,089,093)

Total comprehensive income

419,573

458,069

(38,496)

Preferred stock cash dividends

^[1]

(17,050)

Stock-based compensation transactions, net

13,769

9,378

(201)

4,578

Common stock cash dividends

(142,496)

Ending balance at Jun. 30, 2021

$ 16,720,304

$ 1,250,000

$ 79,871

$ 1,179

$ 6,620,528

$ 14,030,215

$ (176,974)

$ (5,084,515)

[1]

For the three-month and six-month periods ended June 30, 2021, dividends per preferred share were: Preferred Series E - $16.125 and $32.25, respectively; Preferred Series F - $128.125 and $256.25, respectively; and Preferred Series G - $125.00 and $250.00, respectively. Dividends per preferred share for the three-month and six-month periods ended June 30, 2020 were: Preferred Series E - $16.125 and $32.25, respectively; Preferred Series F - $128.125 and $256.25, respectively; and Preferred Series G - $125.00 and $250.694, respectively.

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Preferred Series E [Member]
Preferred stock per share dividend amount	$ 16.125	$ 16.125	$ 32.25	$ 32.25
Preferred Series F [Member]
Preferred stock per share dividend amount	128.125	128.125	256.25	256.25
Preferred Series G [Member]
Preferred stock per share dividend amount	125.00	125.00	250.00	250.694
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.10	$ 1.10	$ 2.20	$ 2.20

Significant accounting policies

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Significant accounting policies

1. Significant accounting policies

The consolidated interim financial statements of M&T Bank Corporation (“M&T”) and subsidiaries (“the Company”) were compiled in accordance with generally accepted accounting principles (“GAAP”) using the accounting policies set forth in note 1 of Notes to Financial Statements included in Form 10-K for the year ended December 31, 2020 (“2020 Annual Report”). The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the interim periods presented.

Acquisition

6 Months Ended

Jun. 30, 2021

Business Combinations [Abstract]

Acquisition

2. Acquisition

On February 22, 2021, M&T announced that it had entered into a definitive agreement with People’s United Financial, Inc. ("People’s United"), headquartered in Bridgeport, Connecticut, under which People’s United will be acquired by M&T in an all-stock transaction. Pursuant to the terms of the agreement, People’s United shareholders will receive consideration valued at .118 of an M&T share in the form of M&T common stock. People’s United outstanding preferred stock will be converted into a new series of M&T preferred stock upon completion of the acquisition. The transaction is valued at approximately $7.4 billion (with the price based on M&T’s closing price of $145.31 per share as of June 30, 2021).

The merger has been approved by the boards of directors and shareholders of each company. The merger is expected to close in the fourth quarter of 2021, subject to the satisfaction of customary closing conditions, including the receipt of regulatory approvals. As of June 30, 2021, People’s United disclosed that it had total assets of $63.3 billion, including $41.4 billion of loans, $55.6 billion of liabilities, including $52.6 billion of deposits, and $7.7 billion of stockholders’ equity.

In connection with the acquisition, the Company incurred merger-related expenses consisting predominantly of professional services for investment banking, legal and other services associated with the proposed transaction that totaled approximately $4 million in the second quarter of 2021 and $10 million in the initial 2021 quarter.

Investment securities

6 Months Ended

Jun. 30, 2021

Investments Debt And Equity Securities [Abstract]

Investment securities

3. Investment securities

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
June 30, 2021
Investment securities available for sale:
U.S. Treasury and federal agencies	$	6,877	$	147	$	1	$	7,023
Mortgage-backed securities:
Government issued or guaranteed		3,658,704		162,369		583		3,820,490
Other debt securities		136,359		2,631		6,720		132,270
		3,801,940		165,147		7,304		3,959,783
Investment securities held to maturity:
U.S. Treasury and federal agencies		3,080		—		2		3,078
Obligations of states and political subdivisions		546		3		—		549
Mortgage-backed securities:
Government issued or guaranteed		1,643,433		70,560		95		1,713,898
Privately issued		68,474		11,152		14,802		64,824
Other debt securities		2,665		—		—		2,665
		1,718,198		81,715		14,899		1,785,014
Total debt securities	$	5,520,138	$	246,862	$	22,203	$	5,744,797
Equity and other securities:
Readily marketable equity — at fair value	$	76,518	$	2,896	$	743	$	78,671
Other — at cost		386,525		—		—		386,525
Total equity and other securities	$	463,043	$	2,896	$	743	$	465,196

December 31, 2020
Investment securities available for sale:
U.S. Treasury and federal agencies	$	9,154	$	198	$	14	$	9,338
Mortgage-backed securities:
Government issued or guaranteed		4,475,406		208,787		755		4,683,438
Privately issued		16		—		—		16
Other debt securities		136,451		1,664		8,301		129,814
		4,621,027		210,649		9,070		4,822,606
Investment securities held to maturity:
U.S. Treasury and federal agencies		2,999		—		—		2,999
Obligations of states and political subdivisions		1,531		9		—		1,540
Mortgage-backed securities:
Government issued or guaranteed		1,664,443		100,176		11		1,764,608
Privately issued		77,155		11,056		17,938		70,273
Other debt securities		2,861		—		—		2,861
		1,748,989		111,241		17,949		1,842,281
Total debt securities	$	6,370,016	$	321,890	$	27,019	$	6,664,887
Equity and other securities:
Readily marketable equity — at fair value	$	67,891	$	25,094	$	—	$	92,985
Other — at cost		381,117		—		—		381,117
Total equity and other securities	$	449,008	$	25,094	$	—	$	474,102

3. Investment securities, continued

There were no significant gross realized gains or losses from sales of investment securities for the three-month and six-month periods ended June 30, 2021 and 2020. Unrealized losses on equity securities were $11 million and $23 million during the three months and six months ended June 30, 2021, respectively, compared with unrealized gains on equity securities of $7 million during the three months ended June 30, 2020 and unrealized losses of $14 million during the six months ended June 30, 2020.

At June 30, 2021, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:

	Amortized Cost		Estimated Fair Value
	(In thousands)
Debt securities available for sale:
Due in one year or less	$	3,490		3,540
Due after one year through five years		11,848		12,440
Due after five years through ten years		97,898		98,672
Due after ten years		30,000		24,641
		143,236		139,293
Mortgage-backed securities available for sale		3,658,704		3,820,490
	$	3,801,940		3,959,783
Debt securities held to maturity:
Due in one year or less	$	371		370
Due after one year through five years		3,255		3,257
Due after ten years		2,665		2,665
		6,291		6,292
Mortgage-backed securities held to maturity		1,711,907		1,778,722
	$	1,718,198		1,785,014

3. Investment securities, continued

A summary of investment securities that as of June 30, 2021 and December 31, 2020 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
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
June 30, 2021
Investment securities available for sale:
U.S. Treasury and federal agencies	$	1,429		(1	)		—		—
Mortgage-backed securities:
Government issued or guaranteed		2,516		(7	)		24,307		(576	)
Other debt securities		2,081		(11	)		64,910		(6,709	)
		6,026		(19	)		89,217		(7,285	)
Investment securities held to maturity:
U.S. Treasury and federal agencies		3,078		(2	)		—		—
Mortgage-backed securities:
Government issued or guaranteed		100,568		(73	)		1,633		(22	)
Privately issued		—		—			49,617		(14,802	)
		103,646		(75	)		51,250		(14,824	)
Total	$	109,672		(94	)		140,467		(22,109	)

December 31, 2020
Investment securities available for sale:
U.S. Treasury and federal agencies	$	985		(14	)		—		—
Mortgage-backed securities:
Government issued or guaranteed		18,687		(356	)		16,556		(399	)
Other debt securities		16,055		(181	)		63,462		(8,120	)
		35,727		(551	)		80,018		(8,519	)
Investment securities held to maturity:
Mortgage-backed securities:
Government issued or guaranteed		2,039		(11	)		—		—
Privately issued		—		—			52,418		(17,938	)
		2,039		(11	)		52,418		(17,938	)
Total	$	37,766		(562	)		132,436		(26,457	)

The Company owned 272 individual debt securities with aggregate gross unrealized losses of $22 million at June 30, 2021. Based on a review of each of the securities in the investment securities portfolio at June 30, 2021, the Company concluded that it expected to recover the amortized cost basis of its investment. As of June 30, 2021, 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 a loss. At June 30, 2021, the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $387 million of cost method equity securities.

The Company estimated no material allowance for credit losses for its investment securities classified as held-to-maturity at June 30, 2021 or December 31, 2020, as the substantial majority of such investment securities are obligations backed by the U.S. government or its agencies.

Loans and leases and the allowance for credit losses

6 Months Ended

Jun. 30, 2021

Receivables [Abstract]

Loans and leases and the allowance for credit losses

4. Loans and leases and the allowance for credit losses

A summary of current, past due and nonaccrual loans as of June 30, 2021 and December 31, 2020 follows:

	Current		30-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Nonaccrual		Total
	(In thousands)
June 30, 2021
Commercial, financial, leasing, etc.	$	25,003,487		70,202		5,562		330,040	$	25,409,291
Real estate:
Commercial		26,112,046		106,638		36,780		1,081,546		27,337,010
Residential builder and developer		1,261,163		13,773		203		14,552		1,289,691
Other commercial construction		8,627,896		165,242		5,178		133,758		8,932,074
Residential		13,693,812		185,110		1,026,449		372,144		15,277,515
Residential — limited documentation		1,277,064		13,689		—		136,683		1,427,436
Consumer:
Home equity lines and loans		3,612,791		16,043		—		76,711		3,705,545
Recreational finance		7,707,774		23,643		—		23,276		7,754,693
Automobile		4,429,573		30,521		—		31,090		4,491,184
Other		1,428,524		15,157		3,055		42,257		1,488,993
Total	$	93,154,130		640,018		1,077,227		2,242,057	$	97,113,432

December 31, 2020
Commercial, financial, leasing, etc.	$	27,196,862	60,822	10,053	306,827	$	27,574,564
Real estate:
Commercial		26,688,515	168,917	47,014	775,894		27,680,340
Residential builder and developer		1,246,095	1,693	856	1,094		1,249,738
Other commercial construction		8,523,591	66,365	3,816	114,039		8,707,811
Residential		13,764,836	200,406	792,888	365,729		15,123,859
Residential — limited documentation		1,462,277	19,687	—	147,170		1,629,134
Consumer:
Home equity lines and loans		3,881,885	24,329	—	79,392		3,985,606
Recreational finance		7,002,643	47,161	—	25,519		7,075,323
Automobile		4,007,349	55,498	—	39,404		4,102,251
Other		1,346,868	17,561	4,581	38,231		1,407,241
Total	$	95,120,921	662,439	859,208	1,893,299	$	98,535,867

4. Loans and leases and the allowance for credit losses, continued

A summary of outstanding loan balances for which COVID-19 related modifications were granted as of June 30, 2021 is presented below. These loans meet the criteria described in note 1 of Notes to Financial Statements in the 2020 Annual Report and, accordingly, are not considered past due or otherwise in default of loan terms as of the date presented. Substantially all of the modifications noted below expire during 2021.

	COVID-19 Related Modifications
June 30, 2021	Payment Deferrals⁽¹⁾			Other Forbearances⁽²⁾		Total
	(In thousands)

Commercial, financial, leasing, etc.	$	18,424		$	76,438	$	94,862
Real estate:
Commercial		169,146			206,945		376,091
Other commercial construction		34,356			21,435		55,791
Residential		2,358,591	(3)		—		2,358,591
Residential — limited documentation		226,153			—		226,153
Consumer:
Home equity lines and loans		11,372			—		11,372
Recreational finance		5,338			—		5,338
Automobile		11,611			—		11,611
Other		504			—		504
Total	$	2,835,495		$	304,818	$	3,140,313

(1)	Represents accruing loans at June 30, 2021 for which a COVID-19 related payment deferral (including maturity extensions) has been granted.

(2)	Consists predominantly of accruing loans for which a COVID-19 related covenant waiver has been granted.

(3)	Includes $2.0 billion of government-guaranteed loans.

One-to-four family residential mortgage loans held for sale were $679 million and $777 million at June 30, 2021 and December 31, 2020, respectively. Commercial real estate loans held for sale were $206 million at June 30, 2021 and $278 million at December 31, 2020.

Credit quality indicators

The Company utilizes a loan grading system to differentiate risk amongst its commercial loans and commercial real estate loans. Loans with a lower expectation of default are assigned one of ten possible “pass” loan grades and are generally ascribed lower loss factors when determining the allowance for credit losses. Loans with an elevated level of credit risk are classified as “criticized” and are ascribed a higher loss factor when determining the allowance for credit losses. Criticized loans may be classified as “nonaccrual” if the Company no longer expects to collect all amounts according to the contractual terms of the loan agreement or the loan is delinquent 90 days or more.

4. Loans and leases and the allowance for credit losses, continued

Loan officers in different geographic locations with the support of the Company’s credit department personnel review and reassign loan grades based on their detailed knowledge of individual borrowers and their judgment of the impact on such borrowers resulting from changing conditions in their respective regions. Factors considered in assigning loan grades include borrower-specific information related to expected future cash flows and operating results, collateral values, geographic location, financial condition and performance, payment status, and other information. The Company’s policy is that, at least annually, updated financial information be obtained from commercial borrowers associated with pass grade loans and additional analysis performed. On a quarterly basis, the Company’s centralized credit department reviews all criticized commercial loans and commercial real estate loans greater than $1 million to determine the appropriateness of the assigned loan grade, including whether the loan should be reported as accruing or nonaccruing.

The following table summarizes the loan grades applied at June 30, 2021 to the various classes of the Company’s commercial loans and commercial real estate loans by origination year.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2021		2020		2019		2018		2017		Prior		Loans		Loans		Total
	(In thousands)
Commercial, financial, leasing, etc.:
Loan grades:
Pass	$	4,216,125		3,644,107		1,839,760		1,237,622		677,218		1,853,234		10,188,593		15,191	$	23,671,850
Criticized accrual		261,644		229,670		116,985		104,301		54,823		102,328		522,570		15,080		1,407,401
Criticized nonaccrual		5,852		22,829		40,502		56,392		20,793		46,805		130,982		5,885		330,040
Total commercial, financial, leasing, etc.	$	4,483,621		3,896,606		1,997,247		1,398,315		752,834		2,002,367		10,842,145		36,156	$	25,409,291

Real estate:
Commercial:
Loan grades:
Pass	$	1,425,509		2,938,763		4,269,700		2,874,138		2,339,451		6,684,419		838,766		—	$	21,370,746
Criticized accrual		13,820		541,484		751,325		977,841		411,494		2,118,127		70,627		—		4,884,718
Criticized nonaccrual		7,685		142,780		141,018		54,288		147,212		579,425		9,138		—		1,081,546
Total commercial real estate	$	1,447,014		3,623,027		5,162,043		3,906,267		2,898,157		9,381,971		918,531		—	$	27,337,010

Residential builder and developer:
Loan grades:
Pass	$	404,742		288,442		153,198		56,920		7,044		17,880		227,386		—	$	1,155,612
Criticized accrual		1,159		2,669		107,817		3,954		630		1,810		1,488		—		119,527
Criticized nonaccrual		—		—		518		10,683		—		575		2,776		—		14,552
Total residential builder and developer	$	405,901		291,111		261,533		71,557		7,674		20,265		231,650		—	$	1,289,691

Other commercial construction:
Loan grades:
Pass	$	369,948		1,618,519		2,725,119		1,455,655		359,053		438,989		60,473		—	$	7,027,756
Criticized accrual		1,408		32,042		555,208		635,998		414,394		131,510		—		—		1,770,560
Criticized nonaccrual		—		—		77,173		13,348		16,322		23,255		3,660		—		133,758
Total other commercial construction	$	371,356		1,650,561		3,357,500		2,105,001		789,769		593,754		64,133		—	$	8,932,074

Increases to criticized loans as compared with December 31, 2020 were predominantly attributable to effects of the COVID-19 pandemic and the related re-grading of loans.

4. Loans and leases and the allowance for credit losses, continued

The Company considers repayment performance a significant indicator of credit quality for its residential real estate loan and consumer loan portfolios. A summary of loans in accrual and nonaccrual status at June 30, 2021 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2021		2020		2019		2018		2017		Prior		Loans		Loans		Total
	(In thousands)
Residential:
Current	$	1,430,194		1,806,964		1,256,245		553,846		1,429,854		7,163,761		52,948		—	$	13,693,812
30-89 days past due		8,415		7,020		3,224		4,072		22,795		139,584		—		—		185,110
Accruing loans past due 90 days or more		—		104,571		29,588		40,820		242,802		608,668		—		—		1,026,449
Nonaccrual		751		22,305		10,345		5,407		4,019		329,033		284		—		372,144
Total residential	$	1,439,360		1,940,860		1,299,402		604,145		1,699,470		8,241,046		53,232		—	$	15,277,515

Residential - limited documentation:
Current	$	—		—		—		—		—		1,277,064		—		—	$	1,277,064
30-89 days past due		—		—		—		—		—		13,689		—		—		13,689
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		136,683		—		—		136,683
Total residential - limited documentation	$	—		—		—		—		—		1,427,436		—		—	$	1,427,436

Consumer:
Home equity lines and loans:
Current	$	270		918		3,367		2,118		2,204		46,330		2,405,415		1,152,169	$	3,612,791
30-89 days past due		—		—		74		—		—		804		—		15,165		16,043
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		6,198		865		69,648		76,711
Total home equity lines and loans	$	270		918		3,441		2,118		2,204		53,332		2,406,280		1,236,982	$	3,705,545

4. Loans and leases and the allowance for credit losses, continued

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2021		2020		2019		2018		2017		Prior		Loans		Loans		Total
	(In thousands)
Recreational finance:
Current	$	1,703,496		2,438,212		1,498,033		763,757		536,566		767,710		—		—	$	7,707,774
30-89 days past due		1,340		4,877		6,218		3,735		3,107		4,366		—		—		23,643
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		289		2,234		3,686		4,202		3,319		9,546		—		—		23,276
Total recreational finance	$	1,705,125		2,445,323		1,507,937		771,694		542,992		781,622		—		—	$	7,754,693

Automobile:
Current	$	1,271,916		1,359,941		873,543		472,973		314,078		137,122		—		—	$	4,429,573
30-89 days past due		2,062		4,653		7,255		6,592		5,869		4,090		—		—		30,521
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		630		1,826		6,119		8,150		7,928		6,437		—		—		31,090
Total automobile	$	1,274,608		1,366,420		886,917		487,715		327,875		147,649		—		—	$	4,491,184

Other:
Current	$	118,343		127,772		103,718		37,304		23,510		27,345		988,950		1,582	$	1,428,524
30-89 days past due		1,814		462		668		328		99		458		10,929		399		15,157
Accruing loans past due 90 days or more		—		—		—		—		—		335		2,720		—		3,055
Nonaccrual		1,446		188		296		190		119		213		39,724		81		42,257
Total other	$	121,603		128,422		104,682		37,822		23,728		28,351		1,042,323		2,062	$	1,488,993

Total loans and leases at June 30, 2021	$	11,248,858		15,343,248		14,580,702		9,384,634		7,044,703		22,677,793		15,558,294		1,275,200	$	97,113,432

4. Loans and leases and the allowance for credit losses, continued

The following table summarizes the loan grades applied at December 31, 2020 to the various classes of the Company’s commercial loans and commercial real estate loans by origination year.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2020		2019		2018		2017		2016		Prior		Loans		Loans		Total
	(In thousands)
Commercial, financial, leasing, etc.:
Loan grades:
Pass	$	7,732,728		2,277,233		1,505,486		930,834		719,796		1,387,695		11,352,416		21,286	$	25,927,474
Criticized accrual		388,326		84,358		113,940		41,587		39,930		73,401		584,751		13,970		1,340,263
Criticized nonaccrual		7,720		27,309		56,227		16,808		19,681		45,471		125,893		7,718		306,827
Total commercial, financial, leasing, etc.	$	8,128,774		2,388,900		1,675,653		989,229		779,407		1,506,567		12,063,060		42,974	$	27,574,564

Real estate:
Commercial:
Loan grades:
Pass	$	3,353,450		4,681,834		3,299,095		2,628,061		2,746,165		5,698,834		875,348		—	$	23,282,787
Criticized accrual		526,037		400,154		579,507		290,885		568,144		1,212,672		44,260		—		3,621,659
Criticized nonaccrual		26,876		121,899		47,144		99,293		197,319		248,949		34,414		—		775,894
Total commercial real estate	$	3,906,363		5,203,887		3,925,746		3,018,239		3,511,628		7,160,455		954,022		—	$	27,680,340

Residential builder and developer:
Loan grades:
Pass	$	506,295		223,880		109,453		15,048		10,976		11,320		236,943		—	$	1,113,915
Criticized accrual		3,690		106,847		14,836		3,421		—		1,885		4,050		—		134,729
Criticized nonaccrual		—		518		—		—		—		576		—		—		1,094
Total residential builder and developer	$	509,985		331,245		124,289		18,469		10,976		13,781		240,993		—	$	1,249,738

Other commercial construction:
Loan grades:
Pass	$	1,050,258		2,998,921		2,048,063		945,339		233,127		294,030		74,611		—	$	7,644,349
Criticized accrual		37,192		148,492		381,091		225,949		144,665		12,034		—		—		949,423
Criticized nonaccrual		335		65,592		13,522		4,213		12,097		12,873		5,407		—		114,039
Total other commercial construction	$	1,087,785		3,213,005		2,442,676		1,175,501		389,889		318,937		80,018		—	$	8,707,811

4. Loans and leases and the allowance for credit losses, continued

A summary of loans in accrual and nonaccrual status at December 31, 2020 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2020		2019		2018		2017		2016		Prior		Loans		Loans		Total
	(In thousands)
Residential:
Current	$	2,722,862		1,416,259		618,736		1,318,094		718,235		6,898,756		71,894		—	$	13,764,836
30-89 days past due		13,496		7,781		7,258		13,477		7,947		150,447		—		—		200,406
Accruing loans past due 90 days or more		579		15,234		38,145		212,818		45,804		480,308		—		—		792,888
Nonaccrual		3,133		14,439		5,183		6,408		2,900		333,466		200		—		365,729
Total residential	$	2,740,070		1,453,713		669,322		1,550,797		774,886		7,862,977		72,094		—	$	15,123,859

Residential - limited documentation:
Current	$	—		—		—		—		—		1,462,277		—		—	$	1,462,277
30-89 days past due		—		—		—		—		—		19,687		—		—		19,687
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		147,170		—		—		147,170
Total residential - limited documentation	$	—		—		—		—		—		1,629,134		—		—	$	1,629,134

Consumer:
Home equity lines and loans:
Current	$	773		3,983		1,591		2,016		162		51,554		2,569,621		1,252,185	$	3,881,885
30-89 days past due		—		—		—		—		—		1,148		939		22,242		24,329
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		6,148		5,752		67,492		79,392
Total home equity lines and loans	$	773		3,983		1,591		2,016		162		58,850		2,576,312		1,341,919	$	3,985,606

4. Loans and leases and the allowance for credit losses, continued

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2020		2019		2018		2017		2016		Prior		Loans		Loans		Total
	(In thousands)
Recreational finance:
Current	$	2,796,359		1,751,766		907,595		630,151		352,414		564,358		—		—	$	7,002,643
30-89 days past due		9,548		11,255		8,519		6,638		2,938		8,263		—		—		47,161
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		1,854		3,883		4,072		4,194		2,733		8,783		—		—		25,519
Total recreational finance	$	2,807,761		1,766,904		920,186		640,983		358,085		581,404		—		—	$	7,075,323
Automobile:
Current	$	1,595,636		1,106,782		629,338		440,604		171,017		63,972		—		—	$	4,007,349
30-89 days past due		6,461		14,140		12,542		12,899		6,373		3,083		—		—		55,498
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		1,615		7,144		10,788		10,061		5,991		3,805		—		—		39,404
Total automobile	$	1,603,712		1,128,066		652,668		463,564		183,381		70,860		—		—	$	4,102,251

Other:
Current	$	160,424		137,617		53,702		32,556		4,526		28,970		927,217		1,856	$	1,346,868
30-89 days past due		1,879		1,130		577		2,301		42		557		10,594		481		17,561
Accruing loans past due 90 days or more		—		—		—		—		—		374		4,207		—		4,581
Nonaccrual		1,493		492		339		183		31		501		35,044		148		38,231
Total other	$	163,796		139,239		54,618		35,040		4,599		30,402		977,062		2,485	$	1,407,241

Total loans and leases at December 31, 2020	$	20,949,019		15,628,942		10,466,749		7,893,838		6,013,013		19,233,367		16,963,561		1,387,378	$	98,535,867

Allowance for credit losses

For purposes of determining the level of the allowance for credit losses, the Company evaluates its loan and lease portfolio by type. Changes in the allowance for credit losses for the three months ended June 30, 2021 were as follows:

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

Beginning balance	$	328,994			716,098			89,789			501,325		$	1,636,206
Provision for credit losses		15,100			(24,805	)		(12,069	)		6,774			(15,000	)
Net charge-offs
Charge-offs		(40,095	)		(12,523	)		(2,262	)		(25,489	)		(80,369	)
Recoveries		10,853			1,193			2,411			19,834			34,291
Net (charge-offs) recoveries		(29,242	)		(11,330	)		149			(5,655	)		(46,078	)
Ending balance	$	314,852			679,963			77,869			502,444		$	1,575,128

4. Loans and leases and the allowance for credit losses, continued

Changes in the allowance for credit losses for the three months ended June 30, 2020 were as follows:

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

Beginning balance	$	358,092			433,689			115,792			476,793		$	1,384,366
Provision for credit losses		69,400			159,090			2,850			93,660			325,000
Net charge-offs
Charge-offs		(32,608	)		(17,472	)		(1,609	)		(39,708	)		(91,397	)
Recoveries		3,373			1,014			1,888			13,992			20,267
Net (charge-offs) recoveries		(29,235	)		(16,458	)		279			(25,716	)		(71,130	)
Ending balance	$	398,257			576,321			118,921			544,737		$	1,638,236

Changes in the allowance for credit losses for the six months ended June 30, 2021 were as follows:

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

Beginning balance	$	405,846			670,719			103,590			556,232		$	1,736,387
Provision for credit losses		(57,318	)		74,666			(25,504	)		(31,844	)		(40,000	)
Net charge-offs
Charge-offs		(67,040	)		(73,175	)		(4,661	)		(58,418	)		(203,294	)
Recoveries		33,364			7,753			4,444			36,474			82,035
Net charge-offs		(33,676	)		(65,422	)		(217	)		(21,944	)		(121,259	)
Ending balance	$	314,852			679,963			77,869			502,444		$	1,575,128

Changes in the allowance for credit losses for the six months ended June 30, 2020 were as follows:

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

Beginning balance	$	366,094			322,201			56,033			229,118			77,625		$	1,051,071
Adoption of new accounting standard		(61,474	)		23,656			53,896			194,004			(77,625	)		132,457
Provision for credit losses		135,994			247,756			12,141			179,109			—			575,000
Net charge-offs
Charge-offs		(48,991	)		(18,744	)		(6,711	)		(84,655	)		—			(159,101	)
Recoveries		6,634			1,452			3,562			27,161			—			38,809
Net charge-offs		(42,357	)		(17,292	)		(3,149	)		(57,494	)		—			(120,292	)
Ending balance	$	398,257			576,321			118,921			544,737			—		$	1,638,236

4. Loans and leases and the allowance for credit losses, continued

Despite the allocation in the preceding tables, the allowance for credit losses is general in nature and is available to absorb losses from any loan or lease type. In establishing the allowance for credit losses, the Company estimates losses attributable to specific troubled credits identified through both normal and targeted credit review processes and also estimates losses for loans and leases with similar risk characteristics on a collective basis. The amounts of specific loss components in the Company’s loan and lease portfolios are determined through a loan-by-loan analysis of larger balance commercial loans and commercial real estate loans that are in nonaccrual status. Such loss estimates are typically based on expected future cash flows, collateral values and other factors that may impact the borrower’s ability to pay. To the extent that those loans are collateral-dependent, they are evaluated based on the fair value of the loan’s collateral as estimated at or near the financial statement date. As the quality of a loan deteriorates to the point of classifying the loan as “criticized,” the process of obtaining updated collateral valuation information is usually initiated, unless it is not considered warranted given factors such as the relative size of the loan, the characteristics of the collateral or the age of the last valuation. In those cases where current appraisals may not yet be available, prior appraisals are utilized with adjustments, as deemed necessary, for estimates of subsequent declines in values as determined by line of business and/or loan workout personnel. Those adjustments are reviewed and assessed for reasonableness by the Company’s credit department. Accordingly, for real estate collateral securing larger nonaccrual commercial loans and commercial real estate loans, estimated collateral values are based on current appraisals and estimates of value. For non-real estate loans, collateral is assigned a discounted estimated liquidation value and, depending on the nature of the collateral, is verified through field exams or other procedures. In assessing collateral, real estate and non-real estate values are reduced by an estimate of selling costs.

For residential real estate loans, including home equity loans and lines of credit, the excess of the loan balance over the net realizable value of the property collateralizing the loan is charged-off when the loan becomes 150 days delinquent. That charge-off is based on recent indications of value from external parties that are generally obtained shortly after a loan becomes nonaccrual. Loans to consumers that file for bankruptcy are generally charged-off to estimated net collateral value shortly after the Company is notified of such filings. When evaluating individual home equity loans and lines of credit for charge off and for purposes of estimating losses in determining the allowance for credit losses, the Company gives consideration to the required repayment of any first lien positions related to collateral property. Modified loans, including smaller balance homogenous loans, that are considered to be troubled debt restructurings are evaluated for impairment giving consideration to the impact of the modified loan terms on the present value of the loan’s expected cash flows.

4. Loans and leases and the allowance for credit losses, continued

Information with respect to loans and leases that were considered nonaccrual at the beginning and end of the reporting period and the interest income recognized on such loans for the three-month and six-month periods ended June 30, 2021 and 2020 follows.

	June 30, 2021						March 31, 2021		January 1, 2021		Three Months Ended June 30, 2021		Six Months Ended June 30, 2021
	Amortized Cost with Allowance		Amortized Cost without Allowance		Total		Amortized Cost		Amortized Cost		Interest Income Recognized		Interest Income Recognized
	(In thousands)

Commercial, financial, leasing, etc.	$	210,294	$	119,746	$	330,040	$	295,069	$	306,827	$	2,930	$	6,015
Real estate:
Commercial		366,166		715,380		1,081,546		824,079		775,894		604		2,262
Residential builder and developer		1,093		13,459		14,552		1,224		1,094		—		33
Other commercial construction		20,717		113,041		133,758		126,225		114,039		274		315
Residential		191,965		180,179		372,144		385,508		365,729		6,296		10,794
Residential — limited documentation		85,683		51,000		136,683		143,069		147,170		157		236
Consumer:
Home equity lines and loans		38,860		37,851		76,711		79,188		79,392		993		1,945
Recreational finance		16,620		6,656		23,276		27,218		25,519		159		314
Automobile		27,609		3,481		31,090		38,219		39,404		48		97
Other		42,096		161		42,257		37,307		38,231		143		323
Total	$	1,001,103	$	1,240,954	$	2,242,057	$	1,957,106	$	1,893,299	$	11,604	$	22,334

	June 30, 2020						March 31, 2020		January 1, 2020		Three Months Ended June 30, 2020		Six Months Ended June 31, 2020
	Amortized Cost with Allowance		Amortized Cost without Allowance		Total		Amortized Cost		Amortized Cost		Interest Income Recognized		Interest Income Recognized
	(In thousands)

Commercial, financial, leasing, etc.	$	138,556	$	146,098	$	284,654	$	286,647	$	346,743	$	1,298	$	3,036
Real estate:
Commercial		57,675		114,813		172,488		188,469		173,796		4,697		5,789
Residential builder and developer		1,748		—		1,748		3,204		4,708		11		59
Other commercial construction		42,969		42,457		85,426		34,935		35,881		5,716		6,577
Residential		80,772		226,135		306,907		293,638		322,504		5,029		11,848
Residential — limited documentation		26,460		92,235		118,695		119,317		114,667		256		457
Consumer:
Home equity lines and loans		38,890		38,204		77,094		63,071		65,039		760		2,219
Recreational finance		16,264		7,888		24,152		13,405		14,308		154		306
Automobile		35,510		7,226		42,736		19,251		21,293		45		92
Other		7,747		35,003		42,750		39,811		35,394		161		315
Total	$	446,591	$	710,059	$	1,156,650	$	1,061,748	$	1,134,333	$	18,127	$	30,698

4. Loans and leases and the allowance for credit losses, continued

In determining the allowance for credit losses, accruing loans with similar risk characteristics are generally evaluated collectively. The Company utilizes statistically developed models to project principal balances over the remaining contractual lives of the loan portfolios and to determine estimated credit losses through a reasonable and supportable forecast period. Individual loan credit quality indicators including loan grade and borrower repayment performance inform the models, which have been statistically developed based on historical correlations of credit losses with prevailing economic metrics, including unemployment, gross domestic product and real estate prices. Model forecasts may be adjusted for inherent limitations or biases that have been identified through independent validation and back-testing of model performance to actual realized results. At both June 30, 2021 and December 31, 2020, the Company utilized a reasonable and supportable forecast period of two years. Subsequent to this forecast period the Company reverted, ratably over a one-year period, to historical loss experience to inform its estimate of losses for the remaining contractual life of each portfolio. Changes in the amount of the allowance for credit losses reflect the outcome of the procedures described herein, including the impact of changes in macroeconomic forecasts as compared with previous forecasts, as well as the impact of portfolio concentrations, changes in underwriting practices, product expansions into new markets, imprecision in economic forecasts and other risk factors that might influence the loss estimation process.

The Company’s reserve for off-balance sheet credit exposures was not material at June 30, 2021 and December 31, 2020.

Loan modifications

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

4. Loans and leases and the allowance for credit losses, continued

The table that follows summarizes the Company’s loan modification activities that were considered troubled debt restructurings for the three-month and six-month periods ended June 30, 2021 and 2020:

					Post-modification (a)
	Number		Pre- modification Recorded Investment		Principal Deferral		Interest Rate Reduction		Other		Combination of Concession Types		Total
Three Months Ended June 30, 2021	(Dollars in thousands)

Commercial, financial, leasing, etc.		89	$	70,749	$	11,439	$	—	$	222	$	58,787	$	70,448
Real estate:
Commercial		35		143,141		7,370		—		28,356		106,435		142,161
Other commercial construction		3		542		532		—		—		—		532
Residential		117		34,041		29,573		—		—		4,290		33,863
Residential — limited documentation		3		405		405		—		—		—		405
Consumer:
Home equity lines and loans		16		1,970		1,970		—		—		—		1,970
Recreational finance		34		1,119		1,119		—		—		—		1,119
Automobile		94		1,502		1,502		—		—		—		1,502
Other		101		836		836		—		—		—		836
Total		492	$	254,305	$	54,746	$	—	$	28,578	$	169,512	$	252,836


Three Months Ended June 30, 2020

Commercial, financial, leasing, etc.		135	$	55,136	$	17,551	$	—	$	31,605	$	5,514	$	54,670
Real estate:
Commercial		46		41,872		10,511		333		4,800		16,348		31,992
Residential builder and developer		1		91		—		—		—		90		90
Residential		25		8,872		3,101		—		—		6,533		9,634
Consumer:
Home equity lines and loans		120		7,571		147		—		—		7,437		7,584
Recreational finance		271		10,795		10,795		—		—		—		10,795
Automobile		1,461		26,352		26,352		—		—		—		26,352
Other		335		2,183		682		—		—		1,501		2,183
Total		2,394	$	152,872	$	69,139	$	333	$	36,405	$	37,423	$	143,300

4. Loans and leases and the allowance for credit losses, continued

					Post-modification (a)
	Number		Pre- modification Recorded Investment		Principal Deferral		Interest Rate Reduction		Other		Combination of Concession Types		Total
Six Months Ended June 30, 2021	(Dollars in thousands)

Commercial, financial, leasing, etc.		182	$	124,482	$	36,092	$	—	$	222	$	87,291	$	123,605
Real estate:
Commercial		68		170,011		18,530		—		30,570		118,857		167,957
Other commercial construction		3		542		532		—		—		—		532
Residential		240		73,624		68,130		—		—		5,407		73,537
Residential — limited documentation		13		1,521		1,464		—		—		—		1,464
Consumer:
Home equity lines and loans		42		3,685		3,456		—		—		174		3,630
Recreational finance		106		3,331		3,331		—		—		—		3,331
Automobile		370		6,471		6,457		—		—		14		6,471
Other		323		2,270		2,270		—		—		—		2,270
Total		1,347	$	385,937	$	140,262	$	—	$	30,792	$	211,743	$	382,797

Six Months Ended June 30, 2020

Commercial, financial, leasing, etc.		167	$	67,828	$	22,617	$	—	$	31,605	$	12,501	$	66,723
Real estate:
Commercial		56		81,514		11,866		333		4,800		52,316		69,315
Residential builder and developer		1		91		—		—		—		90		90
Residential		52		19,050		6,348		—		—		15,510		21,858
Residential — limited documentation		9		2,980		2,667		—		—		1,232		3,899
Consumer:
Home equity lines and loans		126		8,309		559		—		—		7,771		8,330
Recreational finance		274		10,885		10,885		—		—		—		10,885
Automobile		1,470		26,534		26,534		—		—		—		26,534
Other		335		2,183		682		—		—		1,501		2,183
Total		2,490	$	219,374	$	82,158	$	333	$	36,405	$	90,921	$	209,817

(a)	Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages. The present value of interest rate concessions, discounted at the effective rate of the original loan, was not material.

Troubled debt restructurings are evaluated for impairment giving consideration to the impact of the modified loan terms on the present value of the loan’s expected cash flows. Impairment of troubled debt restructurings that have subsequently defaulted may also be measured based on the loan’s observable market price or the fair value of collateral if the loan is collateral-dependent. Charge-offs may also be recognized on troubled debt restructurings that have subsequently defaulted. Loans that were modified as troubled debt restructurings during the twelve months ended June 30, 2021 and 2020 and for which there was a subsequent payment default during the six-month periods ended June 30, 2021 and 2020, respectively, were not material.

The amount of foreclosed residential real estate property held by the Company was $23 million and $28 million at June 30, 2021 and December 31, 2020, respectively. There were $188 million and $214 million at June 30, 2021 and December 31, 2020, respectively, of loans secured by residential real estate that were in the process of foreclosure. Of all loans in the process of foreclosure at June 30, 2021, approximately 39% were government guaranteed.

Borrowings

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Borrowings

5. Borrowings

M&T had $530 million of fixed and variable rate junior subordinated deferrable interest debentures ("Junior Subordinated Debentures") outstanding at June 30, 2021 that 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 risk-based capital guidelines, the securities are includable in M&T’s Tier 2 regulatory capital.

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 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 2033) 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.

On January 25, 2021, $350 million of variable rate senior notes of M&T Bank, the principal bank subsidiary of M&T, matured. In addition, on March 1, 2021, M&T Bank redeemed $500 million of subordinated notes that were due to mature on December 1, 2021.

Revenue from contracts with customers

6 Months Ended

Jun. 30, 2021

Revenue From Contract With Customer [Abstract]

Revenue from contracts with customers

6. Revenue from contracts with customers

A significant amount of the Company’s revenues are derived from net interest income on financial assets and liabilities, mortgage banking revenues, trading account and foreign exchange gains, investment securities gains, loan and letter of credit fees, income from bank-owned life insurance, and certain other revenues that are generally excluded from the scope of accounting guidance for revenue from contracts with customers.

For noninterest income revenue streams, the Company recognizes the expected amount of consideration as revenue when the performance obligations related to the services under the terms of a contract are satisfied. The Company’s contracts generally do not contain terms that necessitate significant judgment to determine the amount of revenue to recognize.

6. Revenue from contracts with customers, continued

The Company generally charges customer accounts or otherwise bills customers upon completion of its services. Typically the Company’s contracts with customers have a duration of one year or less and payment for services is received at least annually, but oftentimes more frequently as services are provided. At June 30, 2021 and December 31, 2020, the Company had $62 million and $67 million, respectively, of amounts receivable related to recognized revenue from the sources in the accompanying tables. Such amounts are classified in accrued interest and other assets in the Company’s consolidated balance sheet. In certain situations the Company is paid in advance of providing services and defers the recognition of revenue until its service obligation is satisfied. At June 30, 2021 and December 31, 2020, the Company had deferred revenue of $38 million and $42 million, respectively, related to the sources in the accompanying tables recorded in accrued interest and other liabilities in the consolidated balance sheet.

The following tables summarize sources of the Company’s noninterest income during the three-month and six-month periods ended June 30, 2021 and 2020 that are subject to the noted accounting guidance.

	Business Banking		Commercial Banking		Commercial Real Estate		Discretionary Portfolio		Residential Mortgage Banking		Retail Banking		All Other			Total
Three Months Ended June 30, 2021	(In thousands)

Classification in consolidated statement of income
Service charges on deposit accounts	$	12,942		24,955		2,898		—		—		56,586		1,137		$	98,518
Trust income		—		—		—		—		—		—		162,991			162,991
Brokerage services income		—		—		—		—		—		20		10,245			10,265
Other revenues from operations:
Merchant discount and credit card fees		13,713		14,435		500		—		—		5,908		(454	)		34,102
Other		—		1,053		1,926		376		1,447		6,012		9,197			20,011
	$	26,655		40,443		5,324		376		1,447		68,526		183,116		$	325,887
Three Months Ended June 30, 2020

Classification in consolidated statement of income
Service charges on deposit accounts	$	11,271		22,514		2,565		—		—		40,024		1,081		$	77,455
Trust income		6		137		—		—		—		—		151,739			151,882
Brokerage services income		—		—		—		—		—		—		10,463			10,463
Other revenues from operations:
Merchant discount and credit card fees		8,159		8,891		379		—		—		3,450		176			21,055
Other		—		787		1,188		150		1,052		3,166		9,421			15,764
	$	19,436		32,329		4,132		150		1,052		46,640		172,880		$	276,619

6. Revenue from contracts with customers, continued

	Business Banking		Commercial Banking		Commercial Real Estate		Discretionary Portfolio		Residential Mortgage Banking		Retail Banking		All Other			Total
Six Months Ended June 30, 2021	(In thousands)

Classification in consolidated statement of income
Service charges on deposit accounts	$	25,439		49,250		5,791		—		—		108,038		2,777		$	191,295
Trust income		—		—		—		—		—		—		319,013			319,013
Brokerage services income		—		—		—		—		—		20		23,358			23,378
Other revenues from operations:
Merchant discount and credit card fees		23,194		24,842		945		—		—		9,829		(345	)		58,465
Other		—		2,011		3,017		760		3,169		11,819		22,145			42,921
	$	48,633		76,103		9,753		760		3,169		129,706		366,948		$	635,072
Six Months Ended June 30, 2020
Classification in consolidated statement of income

Service charges on deposit accounts	$	26,521		46,671		5,377		—		—		101,694		3,353		$	183,616
Trust income		18		441		—		—		—		—		300,174			300,633
Brokerage services income		—		—		—		—		—		—		23,592			23,592
Other revenues from operations:
Merchant discount and credit card fees		18,490		22,207		1,228		—		—		5,721		576			48,222
Other		—		2,973		2,031		1,007		1,974		9,148		21,937			39,070
	$	45,029		72,292		8,636		1,007		1,974		116,563		349,632		$	595,133

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

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-Name Accounting Standards Codification
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+ Details

Pension plans and other postretirement benefits

6 Months Ended

Jun. 30, 2021

Compensation And Retirement Disclosure [Abstract]

Pension plans and other postretirement benefits

7. Pension plans and other postretirement benefits

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

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30
	2021			2020			2021			2020
	(In thousands)

Service cost	$	5,234			5,258			258			262
Interest cost on projected benefit obligation		15,502			17,824			329			451
Expected return on plan assets		(35,774	)		(31,281	)		—			—
Amortization of prior service cost (credit)		151			154			(1,194	)		(1,194	)
Amortization of net actuarial loss (gain)		22,359			15,098			(347	)		(318	)
Net periodic cost (benefit)	$	7,472			7,053			(954	)		(799	)

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30
	2021			2020			2021			2020
	(In thousands)

Service cost	$	10,257			9,972			506			485
Interest cost on projected benefit obligation		30,936			35,710			656			870
Expected return on plan assets		(71,724	)		(62,756	)		—			—
Amortization of prior service cost (credit)		276			279			(2,369	)		(2,369	)
Amortization of net actuarial loss (gain)		44,509			29,048			(647	)		(618	)
Net periodic cost (benefit)	$	14,254			12,253			(1,854	)		(1,632	)

Service cost is reflected in salaries and employee benefits expense in the consolidated statement of income. The other components of net periodic benefit cost are reflected in other costs of operations. Expenses incurred in connection with the Company's defined contribution pension and retirement savings plans totaled $25 million and $23 million for the three months ended June 30, 2021 and 2020, respectively, and $58 million and $51 million for the six months ended June 30, 2021 and 2020, respectively, and are included in salaries and employee benefits expense.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 17
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+ Details

Earnings per common share

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Earnings per common share

8. Earnings per common share

The computations of basic earnings per common share follow:

	Three Months Ended June 30						Six Months Ended June 30
	2021			2020			2021			2020
	(In thousands, except per share)

Income available to common shareholders:
Net income	$	458,069			241,054			905,318			509,876
Less: Preferred stock dividends		(17,050	)		(17,050	)		(34,100	)		(34,128	)
Net income available to common equity		441,019			224,004			871,218			475,748
Less: Income attributable to unvested stock-based compensation awards		(2,263	)		(906	)		(4,370	)		(1,954	)
Net income available to common shareholders	$	438,756			223,098			866,848			473,794
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		129,589			129,059			129,502			129,750
Less: Unvested stock-based compensation awards		(918	)		(784	)		(898	)		(764	)
Weighted-average shares outstanding		128,671			128,275			128,604			128,986

Basic earnings per common share	$	3.41			1.74			6.74			3.67

The computations of diluted earnings per common share follow:

	Three Months Ended June 30						Six Months Ended June 30
	2021			2020			2021			2020
	(In thousands, except per share)

Net income available to common equity	$	441,019			224,004			871,218			475,748
Less: Income attributable to unvested stock-based compensation awards		(2,260	)		(905	)		(4,366	)		(1,953	)
Net income available to common shareholders	$	438,759			223,099			866,852			473,795
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		129,589			129,059			129,502			129,750
Less: Unvested stock-based compensation awards		(918	)		(784	)		(898	)		(764	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock		171			58			152			58
Adjusted weighted-average shares outstanding		128,842			128,333			128,756			129,044

Diluted earnings per common share	$	3.41			1.74			6.73			3.67

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

Stock-based compensation awards to purchase common stock of M&T representing 462,342 common shares during each of the three-month and six-month periods ended June 30, 2021 and 483,491 common shares and 474,093 common shares during the three-month and six-month periods ended June 30, 2020, 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

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Comprehensive income

9. Comprehensive income

The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income:

	Investment			Defined Benefit						Total Amount				Income
	Securities			Plans			Other			Before Tax				Tax			Net
	(In thousands)

Balance — January 1, 2021	$	195,386			(650,087	)		369,558		$	(85,143	)			22,111		$	(63,032	)
Other comprehensive income before reclassifications:
Unrealized holding losses, net		(43,732	)		—			—			(43,732	)			11,596			(32,136	)
Foreign currency translation adjustment		—			—			881			881				(188	)		693
Unrealized losses on cash flow hedges		—			—			(5,969	)		(5,969	)			1,565			(4,404	)
Total other comprehensive income (loss) before reclassifications		(43,732	)		—			(5,088	)		(48,820	)			12,973			(35,847	)
Amounts reclassified from accumulated other comprehensive income that (increase) decrease net income:
Amortization of unrealized holding losses on held-to-maturity (“HTM”) securities		2,232			—			—			2,232		(a)		(587	)		1,645
Gains realized in net income		(4	)		—			—			(4	)	(b)		1			(3	)
Accretion of net gain on terminated cash flow hedges		—			—			(60	)		(60	)	(c)		17			(43	)
Net yield adjustment from cash flow hedges currently in effect		—			—			(148,655	)		(148,655	)	(a)		38,965			(109,690	)
Amortization of prior service credit		—			(2,093	)		—			(2,093	)	(d)		590			(1,503	)
Amortization of actuarial losses		—			43,862			—			43,862		(d)		(12,363	)		31,499
Total other comprehensive income (loss)		(41,504	)		41,769			(153,803	)		(153,538	)			39,596			(113,942	)
Balance — June 30, 2021	$	153,882			(608,318	)		215,755		$	(238,681	)			61,707		$	(176,974	)


Balance — January 1, 2020	$	50,701			(464,548	)		133,888		$	(279,959	)			73,279		$	(206,680	)
Other comprehensive income before reclassifications:
Unrealized holding gains, net		177,086			—			—			177,086				(45,856	)		131,230
Foreign currency translation adjustment		—			—			(3,624	)		(3,624	)			630			(2,994	)
Unrealized gains on cash flow hedges		—			—			511,195			511,195				(132,404	)		378,791
Total other comprehensive income before reclassifications		177,086			—			507,571			684,657				(177,630	)		507,027
Amounts reclassified from accumulated other comprehensive income that (increase) decrease net income:
Amortization of unrealized holding losses on HTM securities		1,619			—			—			1,619		(a)		(450	)		1,169
Accretion of net gain on terminated cash flow hedges		—			—			(64	)		(64	)	(c)		18			(46	)
Net yield adjustment from cash flow hedges currently in effect		—			—			(101,194	)		(101,194	)	(a)		26,210			(74,984	)
Amortization of prior service credit		—			(2,090	)		—			(2,090	)	(d)		650			(1,440	)
Amortization of actuarial losses		—			28,430			—			28,430		(d)		(8,846	)		19,584
Total other comprehensive income		178,705			26,340			406,313			611,358				(160,048	)		451,310
Balance — June 30, 2020	$	229,406			(438,208	)		540,201		$	331,399				(86,769	)	$	244,630

(a)	Included in interest income.

(b)	Included in gain (loss) on bank investment securities.

(c)	Included in interest expense.

(d)	Included in other costs of operations.

9. Comprehensive income, continued

Accumulated other comprehensive income (loss), net consisted of the following:

				Defined
	Investment			Benefit
	Securities			Plans			Other			Total
	(In thousands)

Balance — December 31, 2020	$	144,602		$	(481,064	)	$	273,430		$	(63,032	)
Net gain (loss) during period		(30,494	)		29,996			(113,444	)		(113,942	)
Balance — June 30, 2021	$	114,108		$	(451,068	)	$	159,986		$	(176,974	)

Derivative financial instruments

6 Months Ended

Jun. 30, 2021

Derivative Instruments And Hedging Activities Disclosure [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, collateral and/or settlement provisions protecting the at-risk party. Based on adherence to the Company’s credit standards and the presence of the netting, collateral or settlement provisions, the Company believes that the credit risk inherent in these contracts was not material as of June 30, 2021.

The net effect of interest rate swap agreements was to increase net interest income by $75 million and $166 million during three-month and the six-month periods ended June 30, 2021, respectively, and by $81 million and $117 million during the three-month and six-month periods ended June 30, 2020, 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-						Estimated
	Notional		Average		Average Rate						Fair Value
	Amount		Maturity		Fixed			Variable			Gain (Loss) (a)
	(In thousands)		(In years)								(In thousands)
June 30, 2021
Fair value hedges:
Fixed rate long-term borrowings (b)	$	1,650,000		2.8		2.86	%		0.73	%	$	738
Cash flow hedges:
Interest payments on variable rate commercial real estate loans (b)(c)		32,200,000		0.8		1.43	%		0.09	%		190
Total	$	33,850,000		0.9							$	928
December 31, 2020
Fair value hedges:
Fixed rate long-term borrowings (b)	$	1,650,000		3.3		2.86	%		0.79	%	$	651
Cash flow hedges:
Interest payments on variable rate commercial real estate loans (b)(d)		49,400,000		0.9		2.22	%		0.15	%		425
Total	$	51,050,000		1.0							$	1,076

(a)

Certain clearinghouse exchanges consider payments by counterparties for variation margin on derivative instruments to be settlements of those positions. The impact of such treatment at June 30, 2021 and December 31, 2020 was a reduction of the estimated fair value gains on interest rate swap agreements designated as fair value hedges of $68.9 million and $101.5 million, respectively, and on interest rate swap agreements designated as cash flow hedges of $217.8 million and $372.2 million, respectively.

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

(c)	Includes notional amount and terms of $14.9 billion of forward-starting interest rate swap agreements that become effective in 2021 - 2022.

(d)	Includes notional amount and terms of $32.1 billion of forward-starting interest rate swap agreements that become effective in 2021 - 2022.

10. Derivative financial instruments, continued

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 account 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 account purposes had notional values of $35.3 billion and $37.8 billion at June 30, 2021 and December 31, 2020, respectively. The notional amounts of foreign currency and other option and futures contracts entered into for trading account purposes aggregated $938 million and $776 million at June 30, 2021 and December 31, 2020, 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
	June 30,		December 31,		June 30,		December 31,
	2021		2020		2021		2020
	(In thousands)
Derivatives designated and qualifying as hedging instruments
Interest rate swap agreements (a)	$	1,745	$	1,968	$	817	$	892
Commitments to sell real estate loans (a)		1,353		1,488		1,814		8,458
		3,098		3,456		2,631		9,350
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale (a)		39,262		43,599		3,596		365
Commitments to sell real estate loans (a)		5,522		2,409		7,532		13,868
Trading:
Interest rate contracts (b)		653,557		1,008,913		89,542		105,768
Foreign exchange and other option and futures contracts (b)		9,457		9,608		11,729		11,134
		707,798		1,064,529		112,399		131,135
Total derivatives	$	710,896	$	1,067,985	$	115,030	$	140,485

(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. The impact of variation margin payments at June 30, 2021 and December 31, 2020 was a reduction of the estimated fair value of interest rate contracts in the trading account in an asset position of $32.6 million and $5.6 million, respectively, and in a liability position of $503.1 million and $806.5 million, respectively.

10. Derivative financial instruments, continued

	Amount of Gain (Loss) Recognized
	Three Months Ended June 30, 2021					Three Months Ended June 30, 2020
	Derivative			Hedged Item		Derivative		Hedged Item
	(In thousands)
Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	154			(78)	$	117		(605	)
Derivatives not designated as hedging instruments
Trading:
Interest rate contracts (b)	$	(2,744	)			$	978
Foreign exchange and other option and futures contracts (b)		1,618					717
Total	$	(1,126	)			$	1,695


	Amount of Gain (Loss) Recognized
	Six Months Ended June 30, 2021					Six Months Ended June 30, 2020
	Derivative			Hedged Item		Derivative		Hedged Item
	(In thousands)
Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	(32,504	)		31,820	$	88,827		(88,429	)
Derivatives not designated as hedging instruments
Trading:
Interest rate contracts (b)	$	(5,978	)			$	13,764
Foreign exchange and other option and futures contracts (b)		3,226					5,069
Total	$	(2,752	)			$	18,833

(a)

Reported as an adjustment to interest expense.

(b)

Reported as trading account and foreign exchange gains.

10. Derivative financial instruments, continued

	Carrying Amount of the Hedged Item				Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item
	June 30, 2021		December 31, 2020		June 30, 2021		December 31, 2020
	(In thousands)
Location in the Consolidated Balance Sheet of the Hedged Items in Fair Value Hedges

Long-term debt	$	1,718,333	$	1,750,048	$	69,350	$	101,326

The amount of interest income recognized in the consolidated statement of income associated with derivatives designated as cash flow hedges was $67 million and $69 million for the three months ended June 30, 2021 and 2020, respectively, and $149 million and $101 million for the six months ended June 30, 2021 and 2020, respectively. As of June 30, 2021 the unrealized gain recognized in other comprehensive income related to cash flow hedges was $218 million, of which $27 million, $150 million and $41 million related to interest rate swap agreements maturing in 2021, 2022, and 2023, respectively.

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 $55 million and $64 million at June 30, 2021 and December 31, 2020, 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 Company does not offset derivative asset and liability positions in its consolidated financial statements. The Company’s exposure to credit risk by entering into derivative contracts is mitigated through master netting agreements and collateral posting or settlement requirements. Master netting agreements covering interest rate and foreign exchange contracts with the same party include a right to set-off that becomes enforceable in the event of default, early termination or under other specific conditions.

The aggregate fair value of derivative financial instruments in a liability position and the net liability positions with counterparties which are subject to master netting arrangements was $72 million and $114 million at June 30, 2021 and December 31, 2020, respectively. The Company was required to post collateral relating to those positions of $68 million and $103 million at June 30, 2021 and December 31, 2020, respectively. Certain of the Company’s derivative financial instruments contain provisions that require the Company to maintain specific credit ratings from credit rating agencies to avoid higher collateral posting requirements. If the Company’s debt rating were to fall below specified ratings, the counterparties of the derivative financial instruments could demand immediate incremental collateralization on those instruments in a net liability position. The aggregate fair value of all derivative financial instruments with such credit risk-related contingent features in a net liability position on June 30, 2021 was not material.

The aggregate fair value of derivative financial instruments in an asset position and the net asset positions with counterparties which are subject to enforceable master netting arrangements was $3 million at each of June 30, 2021 and December 31, 2020. Counterparties posted collateral relating to those positions of $3 million at each of those dates. Trading account interest rate swap agreements entered into with customers are subject to the Company’s credit risk standards and often contain collateral provisions.

10. Derivative financial instruments, continued

In addition to the derivative contracts noted above, the Company clears certain derivative transactions through a clearinghouse, rather than directly with counterparties. Those transactions cleared through a clearinghouse require initial margin collateral and variation margin payments depending on the contracts being in a net asset or liability position. The amount of initial margin collateral posted by the Company was $154 million and $135 million at June 30, 2021 and December 31, 2020, respectively. The fair value asset and liability amounts of derivative contracts have been reduced by variation margin payments treated as settlements as described herein. Variation margin on derivative contracts not treated as settlements continues to represent collateral posted or received by the Company.

Variable interest entities and asset securitizations

6 Months Ended

Jun. 30, 2021

Text Block [Abstract]

Variable interest entities and asset securitizations

11. Variable interest entities and asset securitizations

The Company’s securitization activity has consisted of securitizing loans originated for sale into government issued or guaranteed mortgage-backed securities. The Company has not recognized any losses as a result of having securitized assets.

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 each of June 30, 2021 and December 31, 2020, the Company included the junior subordinated debentures as “long-term borrowings” in its consolidated balance sheet and recognized $23 million in other assets for its “investment” in the common securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the junior subordinated debentures associated with preferred capital securities described in note 5.

The Company has invested as a limited partner in various partnerships that collectively had total assets of approximately $2.5 billion at June 30, 2021 and $2.3 billion at December 31, 2020. 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 carrying amount of its investments in such partnerships was $868 million, including $350 million of unfunded commitments, at June 30, 2021 and $861 million, including $406 million of unfunded commitments, at December 31, 2020. Contingent commitments to provide additional capital contributions to these partnerships were not material at June 30, 2021. The Company has not provided financial or other support to the partnerships that was not contractually required. The Company’s maximum exposure to loss from its investments in such partnerships as of June 30, 2021 was $1.2 billion, including possible recapture of certain tax credits. Management currently estimates that no material losses are probable as a result of the Company’s involvement with such 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, in accordance with the accounting provisions for variable interest entities, the partnership entities are not included in the Company’s consolidated financial statements. The Company’s investment in qualified affordable housing projects is amortized to income taxes in the consolidated statement of income as tax credits and other tax benefits resulting from deductible losses associated with the projects are received. The Company amortized $19 million and $38 million of its investments in qualified affordable housing projects to income tax expense during the three-month and six-month periods ended June 30, 2021, respectively, and recognized $22 million and $43 million of tax credits and other tax benefits during those periods. Similarly, for the three-month and six-month periods ended June 30, 2020, the Company amortized $22 million and $43 million of its investments in qualified affordable housing projects to income tax expense, respectively, and recognized $26 million and $52 million of tax credits and other tax benefits during those respective periods.

The Company serves as investment advisor for certain registered money-market funds. The Company has no explicit arrangement to provide support to those funds, but may waive portions of its allowable management fees as a result of market conditions.

Fair value measurements

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [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 June 30, 2021.

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 contracts 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 and other 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 and equity securities

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.

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.

12. Fair value measurements, continued

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

The Company enters into various commitments to originate real estate loans for sale and commitments to sell real estate loans. Such commitments are considered to be derivative financial instruments and, therefore, are carried at estimated fair value on the consolidated balance sheet. The estimated fair values of such commitments were generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans to certain government-sponsored entities and other parties. The fair valuations of commitments to sell real estate loans generally result in a Level 2 classification. The estimated fair value of commitments to originate real estate loans for sale are adjusted to reflect the Company's anticipated commitment expirations. The estimated commitment expirations are considered significant unobservable inputs contributing to the Level 3 classification of commitments to originate real estate loans for sale. Significant unobservable inputs used in the determination of estimated fair value of commitments to originate real estate loans for sale are included in the accompanying table of significant unobservable inputs to Level 3 measurements.

Interest rate swap agreements used for interest rate risk management

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

12. Fair value measurements, continued

The following tables present assets and liabilities at June 30, 2021 and December 31, 2020 measured at estimated fair value on a recurring basis:

	Fair Value Measurements		Level 1		Level 2		Level 3
	(In thousands)
June 30, 2021
Trading account assets	$	712,558	$	49,544	$	663,014	$	—
Investment securities available for sale:
U.S. Treasury and federal agencies		7,023		—		7,023		—
Mortgage-backed securities:
Government issued or guaranteed		3,820,490		—		3,820,490		—
Other debt securities		132,270		—		132,270		—
		3,959,783		—		3,959,783		—
Equity securities		78,671		71,917		6,754		—
Real estate loans held for sale		884,355		—		884,355		—
Other assets (a)		47,882		—		8,620		39,262
Total assets	$	5,683,249	$	121,461	$	5,522,526	$	39,262
Trading account liabilities	$	101,271	$	—	$	101,271	$	—
Other liabilities (a)		13,759		—		10,163		3,596
Total liabilities	$	115,030	$	—	$	111,434	$	3,596

December 31, 2020
Trading account assets	$	1,068,581	$	50,060	$	1,018,521	$	—
Investment securities available for sale:
U.S. Treasury and federal agencies		9,338		—		9,338		—
Mortgage-backed securities:
Government issued or guaranteed		4,683,438		—		4,683,438		—
Privately issued		16		—		—		16
Other debt securities		129,814		—		129,814		—
		4,822,606		—		4,822,590		16
Equity securities		92,985		63,129		29,856		—
Real estate loans held for sale		1,054,676		—		1,054,676		—
Other assets (a)		49,464		—		5,865		43,599
Total assets	$	7,088,312	$	113,189	$	6,931,508	$	43,615
Trading account liabilities	$	116,902	$	—	$	116,902	$	—
Other liabilities (a)		23,583		—		23,218		365
Total liabilities	$	140,485	$	—	$	140,120	$	365

(a)	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).

12. Fair value measurements, continued

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three months ended June 30, 2021 and 2020 were as follows:

	Investment Securities Available for Sale
	Privately Issued Mortgage-Backed Securities			Other Assets and Other Liabilities
2021	(In thousands)

Balance — March 31, 2021	$	16			13,757
Total gains realized/unrealized:
Included in earnings		—			52,312		(a)
Settlements		(16	)		—
Transfers out of Level 3		—			(30,403	)	(b)
Balance — June 30, 2021	$	—			35,666
Changes in unrealized gains included in earnings related to assets still held at June 30, 2021	$	—			37,300		(a)

2020

Balance — March 31, 2020	$	16	35,027
Total gains realized/unrealized:
Included in earnings		—	48,732		(a)
Transfers out of Level 3		—	(43,653	)	(b)
Balance — June 30, 2020	$	16	40,106
Changes in unrealized gains included in earnings related to assets still held at June 30, 2020	$	—	33,725		(a)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the six months ended June 30, 2021 and 2020 were as follows:

	Investment Securities Available for Sale
	Privately Issued Mortgage-Backed Securities			Other Assets and Other Liabilities
2021	(In thousands)

Balance — January 1, 2021	$	16			43,234
Total gains realized/unrealized:
Included in earnings		—			58,337		(a)
Settlements		(16	)		—
Transfers out of Level 3		—			(65,905	)	(b)
Balance — June 30, 2021	$	—			35,666
Changes in unrealized gains included in earnings related to assets still held at June 30, 2021	$	—			35,492		(a)

2020

Balance — January 1, 2020	$	16	10,740
Total gains realized/unrealized:
Included in earnings		—	92,813		(a)
Transfers out of Level 3		—	(63,447	)	(b)
Balance — June 30, 2020	$	16	40,106
Changes in unrealized gains included in earnings related to assets still held at June 30, 2020	$	—	38,514		(a)

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

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

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

Loans

Loans are generally not recorded at fair value on a recurring basis. Periodically, the Company records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectable 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 been classified as Level 2, unless significant adjustments have been made to the valuation that are not readily observable by market participants. Non-real estate collateral supporting commercial loans generally consists of business assets such as receivables, inventory and equipment. Fair value estimations are typically determined by discounting recorded values of those assets to reflect estimated net realizable value considering specific borrower facts and circumstances and the experience of credit personnel in their dealings with similar borrower collateral liquidations. Such discounts were in the range of 15% to 90% with a weighted-average of 44% at June 30, 2021. As these discounts are not readily observable and are considered significant, the valuations have been classified as Level 3. Automobile collateral is typically valued by reference to independent pricing sources based on recent sales transactions of similar vehicles and, accordingly, the related nonrecurring fair value measurement adjustments have been classified as Level 2. Collateral values for other consumer installment loans are generally estimated based on historical recovery rates for similar types of loans which at June 30, 2021 was 41%. As these recovery rates are not readily observable by market participants, such valuation adjustments have been classified as Level 3. Loans subject to nonrecurring fair value measurement were $629 million at June 30, 2021 ($386 million and $243 million of which were classified as Level 2 and Level 3, respectively), $652 million at December 31, 2020 ($339 million and $313 million of which were classified as Level 2 and Level 3, respectively) and $248 million at June 30, 2020 ($145 million and $103 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 June 30, 2021 were decreases of $46 million and $104 million for the three-month and six-month periods ended June 30, 2021, respectively. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on June 30, 2020 were decreases of $50 million for the three-month and six-month periods ended June 30, 2020.

12. Fair value measurements, continued

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, accordingly, 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 $10 million and $31 million at June 30, 2021 and 2020, respectively. Changes in fair value recognized for those foreclosed assets held by the Company were not material during the three-month and six-month periods ended June 30, 2021 and 2020.

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. Capitalized servicing rights related to residential mortgage loans of $152 million and $159 million at June 30, 2021 and December 31, 2020, respectively, required a valuation allowance of $29 million and $30 million, respectively. Significant unobservable inputs used in this Level 3 valuation included weighted-average prepayment speeds of 15.61% and 16.01% at June 30, 2021 and December 31, 2020, respectively, and a weighted-average option-adjusted spread of 900 basis points at each date. Changes in fair value recognized for impairment of capitalized servicing rights were an increase to the valuation allowance of $8 million during the three months ended June 30, 2021 and a decrease in the valuation allowance of $1 million during the six months ended June 30, 2021. Changes in fair value recognized for impairment of capitalized servicing rights were increases in the valuation allowance of $10 million and $20 million during the three months and six months ended June 30, 2020, respectively.

12. Fair value measurements, continued

Significant unobservable inputs to Level 3 measurements

The following tables present quantitative information about significant unobservable inputs used in the fair value measurements for certain Level 3 assets and liabilities at June 30, 2021 and December 31, 2020:

Fair Value

Valuation

Technique

Unobservable

Inputs/Assumptions

Range

(Weighted-

Average)

(In thousands)

June 30, 2021

Recurring fair value measurements

Net other assets (liabilities) (a)

35,666

Discounted cash flow

Commitment expirations

0% - 91% (16%)

December 31, 2020

Recurring fair value measurements

Privately issued mortgage-

backed securities

Two independent pricing quotes

—

Net other assets (liabilities) (a)

43,234

Discounted cash flow

Commitment expirations

0% - 98% (16%)

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

Sensitivity of fair value measurements to changes in unobservable inputs

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

12. Fair value measurements, continued

Disclosures of fair value of financial instruments

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

	June 30, 2021
	Carrying Amount			Estimated Fair Value			Level 1		Level 2			Level 3
	(In thousands)
Financial assets:
Cash and cash equivalents	$	1,410,468			1,410,468			1,291,665		118,803			—
Interest-bearing deposits at banks		33,864,824			33,864,824			—		33,864,824			—
Trading account assets		712,558			712,558			49,544		663,014			—
Investment securities		6,143,177			6,209,993			71,917		6,073,252			64,824
Loans and leases:
Commercial loans and leases		25,409,291			25,174,858			—		—			25,174,858
Commercial real estate loans		37,558,775			36,777,235			—		205,591			36,571,644
Residential real estate loans		16,704,951			16,865,571			—		3,834,635			13,030,936
Consumer loans		17,440,415			17,541,515			—		—			17,541,515
Allowance for credit losses		(1,575,128	)		—			—		—			—
Loans and leases, net		95,538,304			96,359,179			—		4,040,226			92,318,953
Accrued interest receivable		409,745			409,745			—		409,745			—
Financial liabilities:
Noninterest-bearing deposits	$	(55,621,230	)		(55,621,230	)		—		(55,621,230	)		—
Savings and interest-checking deposits		(69,491,942	)		(69,491,942	)		—		(69,491,942	)		—
Time deposits		(3,155,600	)		(3,163,772	)		—		(3,163,772	)		—
Short-term borrowings		(91,235	)		(91,235	)		—		(91,235	)		—
Long-term borrowings		(3,499,448	)		(3,609,147	)		—		(3,609,147	)		—
Accrued interest payable		(48,677	)		(48,677	)		—		(48,677	)		—
Trading account liabilities		(101,271	)		(101,271	)		—		(101,271	)		—
Other financial instruments:
Commitments to originate real estate loans for sale	$	35,666			35,666			—		—			35,666
Commitments to sell real estate loans		(2,471	)		(2,471	)		—		(2,471	)		—
Other credit-related commitments		(131,136	)		(131,136	)		—		—			(131,136	)
Interest rate swap agreements used for interest rate risk management		928			928			—		928			—

12. Fair value measurements, continued

	December 31, 2020
	Carrying Amount			Estimated Fair Value			Level 1		Level 2			Level 3
				(In thousands)
Financial assets:
Cash and cash equivalents	$	1,552,743			1,552,743			1,497,457		55,286			—
Interest-bearing deposits at banks		23,663,810			23,663,810			—		23,663,810			—
Trading account assets		1,068,581			1,068,581			50,060		1,018,521			—
Investment securities		7,045,697			7,138,989			63,129		7,005,571			70,289
Loans and leases:
Commercial loans and leases		27,574,564			27,220,699			—		—			27,220,699
Commercial real estate loans		37,637,889			36,816,580			—		277,911			36,538,669
Residential real estate loans		16,752,993			17,089,141			—		4,135,655			12,953,486
Consumer loans		16,570,421			16,554,050			—		—			16,554,050
Allowance for credit losses		(1,736,387	)		—			—		—			—
Loans and leases, net		96,799,480			97,680,470			—		4,413,566			93,266,904
Accrued interest receivable		419,936			419,936			—		419,936			—
Financial liabilities:
Noninterest-bearing deposits	$	(47,572,884	)		(47,572,884	)		—		(47,572,884	)		—
Savings and interest-checking deposits		(67,680,840	)		(67,680,840	)		—		(67,680,840	)		—
Time deposits		(3,899,910	)		(3,919,367	)		—		(3,919,367	)		—
Deposits at Cayman Islands office		(652,104	)		(652,104	)		—		(652,104	)		—
Short-term borrowings		(59,482	)		(59,482	)		—		(59,482	)		—
Long-term borrowings		(4,382,193	)		(4,490,433	)		—		(4,490,433	)		—
Accrued interest payable		(59,916	)		(59,916	)		—		(59,916	)		—
Trading account liabilities		(116,902	)		(116,902	)		—		(116,902	)		—
Other financial instruments:
Commitments to originate real estate loans for sale	$	43,234			43,234			—		—			43,234
Commitments to sell real estate loans		(18,429	)		(18,429	)		—		(18,429	)		—
Other credit-related commitments		(133,354	)		(133,354	)		—		—			(133,354	)
Interest rate swap agreements used for interest rate risk management		1,076			1,076			—		1,076			—

With the exception of marketable securities, certain off-balance sheet financial instruments and 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.

The Company does not believe that the estimated information presented herein is representative of the earnings power or value of the Company. The preceding analysis, which is inherently limited in depicting fair value, also does not consider any value associated with existing customer relationships nor the ability of the Company to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different.

- Definition

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

+ References + Details

Commitments and contingencies

6 Months Ended

Jun. 30, 2021

Commitments And Contingencies Disclosure [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.

	June 30,		December 31,
	2021		2020
	(In thousands)
Commitments to extend credit
Home equity lines of credit	$	5,677,025	$	5,563,854
Commercial real estate loans to be sold		445,249		363,735
Other commercial real estate		6,077,907		7,237,367
Residential real estate loans to be sold		1,022,844		1,026,118
Other residential real estate		942,654		665,259
Commercial and other		21,003,234		19,427,886
Standby letters of credit		2,269,907		2,241,417
Commercial letters of credit		30,893		27,332
Financial guarantees and indemnification contracts		4,199,215		4,220,531
Commitments to sell real estate loans		2,017,837		2,108,823

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. In addition to the amounts in the preceding table, the Company had discretionary funding commitments to commercial customers of $10.9 billion and $10.4 billion at June 30, 2021 and December 31, 2020, respectively, that the Company had the unconditional right to cancel prior to funding. Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, whereas commercial letters of credit are issued to facilitate commerce and typically result in the commitment being funded when the underlying transaction is consummated between the customer and a third party. The credit risk associated with commitments to extend credit and standby and commercial letters of credit is essentially the same as that involved with extending loans to customers and is subject to normal credit policies. Collateral may be obtained based on management's assessment of the customer's creditworthiness.

Financial guarantees and indemnification contracts are oftentimes similar to standby letters of credit and include mandatory purchase agreements issued to ensure that customer obligations are fulfilled, recourse obligations associated with sold loans, and other guarantees of customer performance or compliance with designated rules and regulations. Included in financial guarantees and indemnification contracts are loan principal amounts sold with recourse in conjunction with the Company's involvement in the Fannie Mae Delegated Underwriting and Servicing program. The Company's maximum credit risk for recourse associated with loans sold under this program totaled approximately $4.0 billion at each of June 30, 2021 and December 31, 2020.

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 is contractually obligated to repurchase previously sold residential real estate loans that do not ultimately meet investor sale criteria related to underwriting procedures or loan documentation. When required to do so, the Company may reimburse loan purchasers for losses incurred or may repurchase certain loans. The Company reduces residential mortgage banking revenues by an estimate for losses related to its obligations to loan purchasers.

13. Commitments and contingencies, continued

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 June 30, 2021, the Company believes that its obligation to loan purchasers was 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 and matters in which claims for monetary damages are asserted. On an on-going basis management, after consultation with legal counsel, assesses the Company’s liabilities and contingencies in connection with such proceedings. For those matters where it is probable that the Company will incur losses and the amounts of the losses can be reasonably estimated, the Company records an expense and corresponding liability in its consolidated financial statements. To the extent pending or threatened litigation could result in exposure in excess of the recorded liability, the amount of such excess is not currently estimable. Although not considered probable, the range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, was estimated to be between $0 and $25 million as of June 30, 2021. Although the Company does not believe that the outcome of pending legal matters will be material to the Company’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations for a particular reporting period in the future.

Segment information

6 Months Ended

Jun. 30, 2021

Segment Reporting [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 of Notes to Financial Statements in the 2020 Annual Report. 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. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in reported segment financial data.

14. Segment information, continued

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

	Three Months Ended June 30
	2021							2020
	Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)		Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)
	(In thousands)

Business Banking	$	145,098		794			41,607	$	138,086		144			37,563
Commercial Banking		284,659		1,012			111,035		287,525		249			111,030
Commercial Real Estate		200,559		230			86,690		227,113		60			107,083
Discretionary Portfolio		118,307		(10,079	)		78,532		138,827		(9,861	)		95,691
Residential Mortgage Banking		146,682		22,875			30,103		142,045		21,016			37,400
Retail Banking		350,988		281			89,200		353,521		267			86,498
All Other		209,680		(15,113	)		20,902		157,293		(11,875	)		(234,211	)
Total	$	1,455,973		—			458,069	$	1,444,410		—			241,054

	Six Months Ended June 30
	2021							2020
	Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)		Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)
	(In thousands)

Business Banking	$	301,001		1,463			87,878	$	275,919		1,029			70,489
Commercial Banking		570,571		1,821			233,673		579,301		1,302			254,762
Commercial Real Estate		401,402		452			157,962		450,418		469			224,491
Discretionary Portfolio		252,851		(20,106	)		169,078		188,046		(22,898	)		121,359
Residential Mortgage Banking		300,442		45,058			79,714		267,606		42,433			62,016
Retail Banking		697,905		553			174,558		756,204		534			196,744
All Other		418,794		(29,241	)		2,455		433,081		(22,869	)		(419,985	)
Total	$	2,942,966		—			905,318	$	2,950,575		—			509,876

	Average Total Assets
	Six Months Ended June 30				Year Ended December 31
	2021		2020		2020
	(In millions)

Business Banking	$	8,681		7,235		8,152
Commercial Banking		29,927		30,603		30,338
Commercial Real Estate		25,999		25,340		25,792
Discretionary Portfolio		22,769		26,821		27,726
Residential Mortgage Banking		6,638		3,113		4,038
Retail Banking		17,444		16,039		16,438
All Other		37,948		19,362		22,996
Total	$	149,406		128,513		135,480

(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 $3,732,000 and $4,234,000 for the three-month periods ended June 30, 2021 and 2020, respectively, and $7,465,000 and $9,297,000 for the six-month periods ended June 30, 2021 and 2020, respectively, and is eliminated in "All Other" total revenues. Intersegment revenues are included in total revenues of the reportable segments. The elimination of intersegment revenues is included in the determination of "All Other" total revenues.

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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

6 Months Ended

Jun. 30, 2021

Text Block [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.

M&T holds a 20% minority interest in Bayview Lending Group LLC ("BLG"), a privately-held commercial mortgage company. That investment had no remaining carrying value at June 30, 2021 as a result of cumulative losses recognized and cash distributions received in prior years. Cash distributions now received from BLG are recognized as income by M&T and included in other revenues from operations. That income totaled $23 million during the three-month period ended March 31, 2020. There were no similar cash distributions during the six-month period ended June 30, 2021 or in the three-month period ended June 30, 2020.

Bayview Financial Holdings, L.P. (together with its affiliates, "Bayview Financial"), a privately-held specialty finance company, is BLG's majority investor. In addition to their common investment in BLG, the Company and Bayview Financial conduct other business activities with each other. The Company has obtained loan servicing rights for mortgage loans from BLG and Bayview Financial having outstanding principal balances of $1.8 billion and $1.9 billion at June 30, 2021 and December 31, 2020, respectively. Revenues from those servicing rights were $2 million in each of the three-month periods ended June 30, 2021 and 2020, respectively, and $4 million and $5 million for the six-month periods ended June 30, 2021 and 2020, respectively. The Company sub-services residential mortgage loans for Bayview Financial having outstanding principal balances of $72.6 billion and $68.1 billion at June 30, 2021 and December 31, 2020, respectively. Revenues earned for sub-servicing loans for Bayview Financial were $37 million and $34 million for the three-month periods ended June 30, 2021 and 2020, respectively, and $71 million in each of the six-month periods ended June 30, 2021 and 2020. In addition, the Company held $68 million and $77 million of mortgage-backed securities in its held-to-maturity portfolio at June 30, 2021 and December 31, 2020, respectively, that were securitized by Bayview Financial. At June 30, 2021, the Company held $185 million of Bayview Financial’s $1.3 billion syndicated loan facility. In the first six months of 2021, the Company purchased $965 million of delinquent FHA guaranteed mortgage loans, including past due accrued interest, from Bayview Financial for $1.0 billion. The servicing rights for such loans were retained by Bayview Financial, but the Company continues to sub-service the loans.

Recent accounting developments

6 Months Ended

Jun. 30, 2021

Accounting Changes And Error Corrections [Abstract]

Recent accounting developments

16. Recent accounting developments

The following table provides a description of accounting standards that were adopted by the Company in 2021 as well as standards that are not effective that could have an impact to M&T’s consolidated financial statements upon adoption.

Standard

Description

Required date

of adoption

Effect on consolidated financial statements

Standards Adopted in 2021

Clarifying the Interactions Between Equity Securities, Equity Method and Joint Ventures, and Derivatives and Hedging

The amendments clarify the following guidance:

1. That an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative in the equity securities investments guidance immediately before applying or upon discontinuing the equity method of accounting.

2. For the purpose of applying the derivatives and hedging guidance an entity should not consider whether, upon the settlement of a forward contract or exercise of a purchased option, individually or with existing investments, the underlying securities would be accounted for under the equity method of accounting or the fair value option in accordance with the financial instruments guidance. An entity also would evaluate the remaining characteristics in the derivatives and hedging guidance to determine the accounting for those forward contracts and purchased options.

January 1, 2021

The Company adopted the amended guidance effective January 1, 2021 using a prospective transition method. The adoption did not have a material impact on the Company’s consolidated financial statements.

16. Recent accounting developments, continued

Standard

Description

Required date

of adoption

Effect on consolidated financial statements

Standards Adopted in 2021

Simplifying the Accounting for Income Taxes

The amendments remove the following exceptions for accounting for income taxes:

1. Exception to the incremental approach for intraperiod tax allocation when there is a loss from continuing operations and income or a gain from other items (for example, discontinued operations or other comprehensive income)

2. Exception to the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment

3. Exception to the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary

4. Exception to the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year.

The amendments also simplify the accounting for income taxes by doing the following:

1. Requiring that an entity recognize a franchise tax (or similar tax) that is partially based on income as an income-based tax and account for any incremental amount incurred as a non-income-based tax.

2. Requiring that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should be considered a separate transaction.

3. Specifying that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements. However, an entity may elect to do so (on an entity-by-entity basis) for a legal entity that is both not subject to tax and disregarded by the taxing authority.

4. Requiring that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date.

5. Making minor Codification improvements for income taxes related to employee stock ownership plans and investments in qualified affordable housing projects accounted for using the equity method.

January 1, 2021

The amendments related to separate financial statements of legal entities that are not subject to tax should be applied on a retrospective basis for all periods presented. The amendments related to changes in ownership of foreign equity method investments or foreign subsidiaries should be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. The amendments related to franchise taxes that are partially based on income should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. All other amendments should be applied on a prospective basis.

The adoption did not have a material impact on the Company’s consolidated financial statements.

16. Recent accounting developments, continued

Standard

Description

Required date

of adoption

Effect on consolidated financial statements

Standards Not Yet Adopted as of June 30, 2021

Changes to Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity

The amendments reduce the number of accounting models for convertible debt instruments and convertible preferred stock. The amendments also reduce form-over-substance-based guidance for the derivatives scope exception for contacts in an entity’s own equity. For convertible instruments, embedded conversion features no longer are separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives, or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost and a convertible preferred stock will be accounted for as a single equity instrument measured at its historical cost, as long as no other features require bifurcation and recognition as derivatives. By removing those separation models, the interest rate of convertible debt instruments typically will be closer to the coupon interest rate on the instrument. The amendments also require certain changes to EPS calculations for convertible instruments as well as additional disclosures relating to conditions that cause conversion features to be met.

For contacts in an entity’s own equity, the amendments revise the derivatives scope exception guidance as follows:

1. Remove the settlement in unregistered shares, collateral, and shareholder rights conditions from the settlement guidance.

2. Clarify that payment penalties for failure to timely file do not preclude equity classification.

3. Require instruments that are required to be classified as an asset or liability to be measured subsequently at fair value, with changes reported in earnings and disclosed in the financial statements. 4. Clarifiy that the scope of the disclosure requirements in the Contracts in an Entity’s Own Equity section of the Derivatives guidance applies only to freestanding instruments.

5. Clarify that the scope of the reassessment guidance in the Contracts in an Entity’s Own Equity section of the Derivatives guidance applies to both freestanding instruments and embedded features.

January 1, 2022

Early adoption permitted

The amendments can be applied either on a modified retrospective method of transition or a fully retrospective method of transition. In applying the modified retrospective method, the guidance should be applied to transactions outstanding as of the beginning of the fiscal year in which the amendments are adopted. Transactions that were settled (or expired) during prior reporting periods are unaffected. The cumulative effect of the change should be recognized as an adjustment to the opening balance of retained earnings at the date of adoption. If applying the fully retrospective method of transition, the cumulative effect of the change should be recognized as an adjustment to the opening balance of retained earnings in the first comparative period presented.

The fair value option is allowed to be irrevocably elected for any financial instrument that is a convertible security upon adoption of the amendments.

The Company has not yet decided on which transition method will be applied to the extent applicable. The Company does not expect the guidance will have a material impact on its consolidated financial statements.

16. Recent accounting developments, continued

Standard

Description

Required date

of adoption

Effect on consolidated financial statements

Standards Not Yet Adopted of June 30, 2021

Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options

The amendments clarify and reduce diversity in an issuer’s accounting for modifications or exchanges of freestanding equity-classified written call options (for example, warrants) that remain equity classified after modification or exchange.

The amendments clarify that:

1. A modification of the terms or conditions or an exchange of a freestanding equity-classified written call option that remains equity classified after modification or exchange should be treated as an exchange of the original instrument for a new instrument.

2. The effect of a modification or an exchange of a freestanding equity-classified written call option that remains equity classified after modification or exchange should be measured as follows:

a. For a modification or an exchange that is a part of or directly related to a modification or an exchange of an existing debt instrument or line-of-credit or revolving-debt arrangements, as the difference between the fair value of the modified or exchanged written call option and the fair value of that written call option immediately before it is modified or exchanged.

b. For all other modifications or exchanges, as the excess, if any, of the fair value of the modified or exchanged written call option over the fair value of that written call option immediately before it is modified or exchanged.

3. The effect of a modification or an exchange of a freestanding equity-classified written call option that remains equity classified after modification or exchange should be recognized on the basis of the substance of the transaction, in the same manner as if cash had been paid as consideration. The effect of a modification or an exchange of a freestanding equity-classified written call option to compensate for goods or services should be recognized in accordance with the Stock Compensation guidance. In a multiple-element transaction (for example, one that includes both debt financing and equity financing), the total effect of the modification should be allocated to the respective elements in the transaction.

January 1, 2021

Early adoption permitted

The amendments should be applied on a prospective basis. The Company currently does not have any instruments that fall within the guidance and does not expect the guidance to have a material impact on its financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 65
-Paragraph 1
-Subparagraph (g)(2)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-URI http://asc.fasb.org/topic&trid=2122394

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (g)(1)
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Significant accounting policies (Policies)	6 Months Ended
Significant accounting policies (Policies)	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Accounting	The consolidated interim financial statements of M&T Bank Corporation (“M&T”) and subsidiaries (“the Company”) were compiled in accordance with generally accepted accounting principles (“GAAP”) using the accounting policies set forth in note 1 of Notes to Financial Statements included in Form 10-K for the year ended December 31, 2020 (“2020 Annual Report”). The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the interim periods presented.

Investment securities (Tables)

6 Months Ended

Jun. 30, 2021

Investments Debt And Equity Securities [Abstract]

Amortized Cost and Estimated Fair Value of Investment Securities

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	(In thousands)
June 30, 2021
Investment securities available for sale:
U.S. Treasury and federal agencies	$	6,877	$	147	$	1	$	7,023
Mortgage-backed securities:
Government issued or guaranteed		3,658,704		162,369		583		3,820,490
Other debt securities		136,359		2,631		6,720		132,270
		3,801,940		165,147		7,304		3,959,783
Investment securities held to maturity:
U.S. Treasury and federal agencies		3,080		—		2		3,078
Obligations of states and political subdivisions		546		3		—		549
Mortgage-backed securities:
Government issued or guaranteed		1,643,433		70,560		95		1,713,898
Privately issued		68,474		11,152		14,802		64,824
Other debt securities		2,665		—		—		2,665
		1,718,198		81,715		14,899		1,785,014
Total debt securities	$	5,520,138	$	246,862	$	22,203	$	5,744,797
Equity and other securities:
Readily marketable equity — at fair value	$	76,518	$	2,896	$	743	$	78,671
Other — at cost		386,525		—		—		386,525
Total equity and other securities	$	463,043	$	2,896	$	743	$	465,196

December 31, 2020
Investment securities available for sale:
U.S. Treasury and federal agencies	$	9,154	$	198	$	14	$	9,338
Mortgage-backed securities:
Government issued or guaranteed		4,475,406		208,787		755		4,683,438
Privately issued		16		—		—		16
Other debt securities		136,451		1,664		8,301		129,814
		4,621,027		210,649		9,070		4,822,606
Investment securities held to maturity:
U.S. Treasury and federal agencies		2,999		—		—		2,999
Obligations of states and political subdivisions		1,531		9		—		1,540
Mortgage-backed securities:
Government issued or guaranteed		1,664,443		100,176		11		1,764,608
Privately issued		77,155		11,056		17,938		70,273
Other debt securities		2,861		—		—		2,861
		1,748,989		111,241		17,949		1,842,281
Total debt securities	$	6,370,016	$	321,890	$	27,019	$	6,664,887
Equity and other securities:
Readily marketable equity — at fair value	$	67,891	$	25,094	$	—	$	92,985
Other — at cost		381,117		—		—		381,117
Total equity and other securities	$	449,008	$	25,094	$	—	$	474,102

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

At June 30, 2021, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows:

	Amortized Cost		Estimated Fair Value
	(In thousands)
Debt securities available for sale:
Due in one year or less	$	3,490		3,540
Due after one year through five years		11,848		12,440
Due after five years through ten years		97,898		98,672
Due after ten years		30,000		24,641
		143,236		139,293
Mortgage-backed securities available for sale		3,658,704		3,820,490
	$	3,801,940		3,959,783
Debt securities held to maturity:
Due in one year or less	$	371		370
Due after one year through five years		3,255		3,257
Due after ten years		2,665		2,665
		6,291		6,292
Mortgage-backed securities held to maturity		1,711,907		1,778,722
	$	1,718,198		1,785,014

Investment Securities in Continuous Unrealized Loss Position

	Less Than 12 Months					12 Months or More
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
June 30, 2021
Investment securities available for sale:
U.S. Treasury and federal agencies	$	1,429		(1	)		—		—
Mortgage-backed securities:
Government issued or guaranteed		2,516		(7	)		24,307		(576	)
Other debt securities		2,081		(11	)		64,910		(6,709	)
		6,026		(19	)		89,217		(7,285	)
Investment securities held to maturity:
U.S. Treasury and federal agencies		3,078		(2	)		—		—
Mortgage-backed securities:
Government issued or guaranteed		100,568		(73	)		1,633		(22	)
Privately issued		—		—			49,617		(14,802	)
		103,646		(75	)		51,250		(14,824	)
Total	$	109,672		(94	)		140,467		(22,109	)

December 31, 2020
Investment securities available for sale:
U.S. Treasury and federal agencies	$	985		(14	)		—		—
Mortgage-backed securities:
Government issued or guaranteed		18,687		(356	)		16,556		(399	)
Other debt securities		16,055		(181	)		63,462		(8,120	)
		35,727		(551	)		80,018		(8,519	)
Investment securities held to maturity:
Mortgage-backed securities:
Government issued or guaranteed		2,039		(11	)		—		—
Privately issued		—		—			52,418		(17,938	)
		2,039		(11	)		52,418		(17,938	)
Total	$	37,766		(562	)		132,436		(26,457	)

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

6 Months Ended

Jun. 30, 2021

Receivables [Abstract]

Summary of Current, Past Due and Nonaccrual Loans

A summary of current, past due and nonaccrual loans as of June 30, 2021 and December 31, 2020 follows:

	Current		30-89 Days Past Due		Accruing Loans Past Due 90 Days or More		Nonaccrual		Total
	(In thousands)
June 30, 2021
Commercial, financial, leasing, etc.	$	25,003,487		70,202		5,562		330,040	$	25,409,291
Real estate:
Commercial		26,112,046		106,638		36,780		1,081,546		27,337,010
Residential builder and developer		1,261,163		13,773		203		14,552		1,289,691
Other commercial construction		8,627,896		165,242		5,178		133,758		8,932,074
Residential		13,693,812		185,110		1,026,449		372,144		15,277,515
Residential — limited documentation		1,277,064		13,689		—		136,683		1,427,436
Consumer:
Home equity lines and loans		3,612,791		16,043		—		76,711		3,705,545
Recreational finance		7,707,774		23,643		—		23,276		7,754,693
Automobile		4,429,573		30,521		—		31,090		4,491,184
Other		1,428,524		15,157		3,055		42,257		1,488,993
Total	$	93,154,130		640,018		1,077,227		2,242,057	$	97,113,432

December 31, 2020
Commercial, financial, leasing, etc.	$	27,196,862	60,822	10,053	306,827	$	27,574,564
Real estate:
Commercial		26,688,515	168,917	47,014	775,894		27,680,340
Residential builder and developer		1,246,095	1,693	856	1,094		1,249,738
Other commercial construction		8,523,591	66,365	3,816	114,039		8,707,811
Residential		13,764,836	200,406	792,888	365,729		15,123,859
Residential — limited documentation		1,462,277	19,687	—	147,170		1,629,134
Consumer:
Home equity lines and loans		3,881,885	24,329	—	79,392		3,985,606
Recreational finance		7,002,643	47,161	—	25,519		7,075,323
Automobile		4,007,349	55,498	—	39,404		4,102,251
Other		1,346,868	17,561	4,581	38,231		1,407,241
Total	$	95,120,921	662,439	859,208	1,893,299	$	98,535,867

Summary of Outstanding Loan Balances Related To COVID-19 Modifications Granted

4. Loans and leases and the allowance for credit losses, continued

	COVID-19 Related Modifications
June 30, 2021	Payment Deferrals⁽¹⁾			Other Forbearances⁽²⁾		Total
	(In thousands)

Commercial, financial, leasing, etc.	$	18,424		$	76,438	$	94,862
Real estate:
Commercial		169,146			206,945		376,091
Other commercial construction		34,356			21,435		55,791
Residential		2,358,591	(3)		—		2,358,591
Residential — limited documentation		226,153			—		226,153
Consumer:
Home equity lines and loans		11,372			—		11,372
Recreational finance		5,338			—		5,338
Automobile		11,611			—		11,611
Other		504			—		504
Total	$	2,835,495		$	304,818	$	3,140,313

Summary of Loan grades applied various classes of Commercial and Real Estate Loans

The following table summarizes the loan grades applied at June 30, 2021 to the various classes of the Company’s commercial loans and commercial real estate loans by origination year.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2021		2020		2019		2018		2017		Prior		Loans		Loans		Total
	(In thousands)
Commercial, financial, leasing, etc.:
Loan grades:
Pass	$	4,216,125		3,644,107		1,839,760		1,237,622		677,218		1,853,234		10,188,593		15,191	$	23,671,850
Criticized accrual		261,644		229,670		116,985		104,301		54,823		102,328		522,570		15,080		1,407,401
Criticized nonaccrual		5,852		22,829		40,502		56,392		20,793		46,805		130,982		5,885		330,040
Total commercial, financial, leasing, etc.	$	4,483,621		3,896,606		1,997,247		1,398,315		752,834		2,002,367		10,842,145		36,156	$	25,409,291

Real estate:
Commercial:
Loan grades:
Pass	$	1,425,509		2,938,763		4,269,700		2,874,138		2,339,451		6,684,419		838,766		—	$	21,370,746
Criticized accrual		13,820		541,484		751,325		977,841		411,494		2,118,127		70,627		—		4,884,718
Criticized nonaccrual		7,685		142,780		141,018		54,288		147,212		579,425		9,138		—		1,081,546
Total commercial real estate	$	1,447,014		3,623,027		5,162,043		3,906,267		2,898,157		9,381,971		918,531		—	$	27,337,010

Residential builder and developer:
Loan grades:
Pass	$	404,742		288,442		153,198		56,920		7,044		17,880		227,386		—	$	1,155,612
Criticized accrual		1,159		2,669		107,817		3,954		630		1,810		1,488		—		119,527
Criticized nonaccrual		—		—		518		10,683		—		575		2,776		—		14,552
Total residential builder and developer	$	405,901		291,111		261,533		71,557		7,674		20,265		231,650		—	$	1,289,691

Other commercial construction:
Loan grades:
Pass	$	369,948		1,618,519		2,725,119		1,455,655		359,053		438,989		60,473		—	$	7,027,756
Criticized accrual		1,408		32,042		555,208		635,998		414,394		131,510		—		—		1,770,560
Criticized nonaccrual		—		—		77,173		13,348		16,322		23,255		3,660		—		133,758
Total other commercial construction	$	371,356		1,650,561		3,357,500		2,105,001		789,769		593,754		64,133		—	$	8,932,074

The following table summarizes the loan grades applied at December 31, 2020 to the various classes of the Company’s commercial loans and commercial real estate loans by origination year.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2020		2019		2018		2017		2016		Prior		Loans		Loans		Total
	(In thousands)
Commercial, financial, leasing, etc.:
Loan grades:
Pass	$	7,732,728		2,277,233		1,505,486		930,834		719,796		1,387,695		11,352,416		21,286	$	25,927,474
Criticized accrual		388,326		84,358		113,940		41,587		39,930		73,401		584,751		13,970		1,340,263
Criticized nonaccrual		7,720		27,309		56,227		16,808		19,681		45,471		125,893		7,718		306,827
Total commercial, financial, leasing, etc.	$	8,128,774		2,388,900		1,675,653		989,229		779,407		1,506,567		12,063,060		42,974	$	27,574,564

Real estate:
Commercial:
Loan grades:
Pass	$	3,353,450		4,681,834		3,299,095		2,628,061		2,746,165		5,698,834		875,348		—	$	23,282,787
Criticized accrual		526,037		400,154		579,507		290,885		568,144		1,212,672		44,260		—		3,621,659
Criticized nonaccrual		26,876		121,899		47,144		99,293		197,319		248,949		34,414		—		775,894
Total commercial real estate	$	3,906,363		5,203,887		3,925,746		3,018,239		3,511,628		7,160,455		954,022		—	$	27,680,340

Residential builder and developer:
Loan grades:
Pass	$	506,295		223,880		109,453		15,048		10,976		11,320		236,943		—	$	1,113,915
Criticized accrual		3,690		106,847		14,836		3,421		—		1,885		4,050		—		134,729
Criticized nonaccrual		—		518		—		—		—		576		—		—		1,094
Total residential builder and developer	$	509,985		331,245		124,289		18,469		10,976		13,781		240,993		—	$	1,249,738

Other commercial construction:
Loan grades:
Pass	$	1,050,258		2,998,921		2,048,063		945,339		233,127		294,030		74,611		—	$	7,644,349
Criticized accrual		37,192		148,492		381,091		225,949		144,665		12,034		—		—		949,423
Criticized nonaccrual		335		65,592		13,522		4,213		12,097		12,873		5,407		—		114,039
Total other commercial construction	$	1,087,785		3,213,005		2,442,676		1,175,501		389,889		318,937		80,018		—	$	8,707,811

Summary of loans in Accrual and Nonaccrual Status

. A summary of loans in accrual and nonaccrual status at June 30, 2021 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2021		2020		2019		2018		2017		Prior		Loans		Loans		Total
	(In thousands)
Residential:
Current	$	1,430,194		1,806,964		1,256,245		553,846		1,429,854		7,163,761		52,948		—	$	13,693,812
30-89 days past due		8,415		7,020		3,224		4,072		22,795		139,584		—		—		185,110
Accruing loans past due 90 days or more		—		104,571		29,588		40,820		242,802		608,668		—		—		1,026,449
Nonaccrual		751		22,305		10,345		5,407		4,019		329,033		284		—		372,144
Total residential	$	1,439,360		1,940,860		1,299,402		604,145		1,699,470		8,241,046		53,232		—	$	15,277,515

Residential - limited documentation:
Current	$	—		—		—		—		—		1,277,064		—		—	$	1,277,064
30-89 days past due		—		—		—		—		—		13,689		—		—		13,689
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		136,683		—		—		136,683
Total residential - limited documentation	$	—		—		—		—		—		1,427,436		—		—	$	1,427,436

Consumer:
Home equity lines and loans:
Current	$	270		918		3,367		2,118		2,204		46,330		2,405,415		1,152,169	$	3,612,791
30-89 days past due		—		—		74		—		—		804		—		15,165		16,043
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		6,198		865		69,648		76,711
Total home equity lines and loans	$	270		918		3,441		2,118		2,204		53,332		2,406,280		1,236,982	$	3,705,545

4. Loans and leases and the allowance for credit losses, continued

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2021		2020		2019		2018		2017		Prior		Loans		Loans		Total
	(In thousands)
Recreational finance:
Current	$	1,703,496		2,438,212		1,498,033		763,757		536,566		767,710		—		—	$	7,707,774
30-89 days past due		1,340		4,877		6,218		3,735		3,107		4,366		—		—		23,643
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		289		2,234		3,686		4,202		3,319		9,546		—		—		23,276
Total recreational finance	$	1,705,125		2,445,323		1,507,937		771,694		542,992		781,622		—		—	$	7,754,693

Automobile:
Current	$	1,271,916		1,359,941		873,543		472,973		314,078		137,122		—		—	$	4,429,573
30-89 days past due		2,062		4,653		7,255		6,592		5,869		4,090		—		—		30,521
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		630		1,826		6,119		8,150		7,928		6,437		—		—		31,090
Total automobile	$	1,274,608		1,366,420		886,917		487,715		327,875		147,649		—		—	$	4,491,184

Other:
Current	$	118,343		127,772		103,718		37,304		23,510		27,345		988,950		1,582	$	1,428,524
30-89 days past due		1,814		462		668		328		99		458		10,929		399		15,157
Accruing loans past due 90 days or more		—		—		—		—		—		335		2,720		—		3,055
Nonaccrual		1,446		188		296		190		119		213		39,724		81		42,257
Total other	$	121,603		128,422		104,682		37,822		23,728		28,351		1,042,323		2,062	$	1,488,993

Total loans and leases at June 30, 2021	$	11,248,858		15,343,248		14,580,702		9,384,634		7,044,703		22,677,793		15,558,294		1,275,200	$	97,113,432

A summary of loans in accrual and nonaccrual status at December 31, 2020 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows.

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2020		2019		2018		2017		2016		Prior		Loans		Loans		Total
	(In thousands)
Residential:
Current	$	2,722,862		1,416,259		618,736		1,318,094		718,235		6,898,756		71,894		—	$	13,764,836
30-89 days past due		13,496		7,781		7,258		13,477		7,947		150,447		—		—		200,406
Accruing loans past due 90 days or more		579		15,234		38,145		212,818		45,804		480,308		—		—		792,888
Nonaccrual		3,133		14,439		5,183		6,408		2,900		333,466		200		—		365,729
Total residential	$	2,740,070		1,453,713		669,322		1,550,797		774,886		7,862,977		72,094		—	$	15,123,859

Residential - limited documentation:
Current	$	—		—		—		—		—		1,462,277		—		—	$	1,462,277
30-89 days past due		—		—		—		—		—		19,687		—		—		19,687
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		147,170		—		—		147,170
Total residential - limited documentation	$	—		—		—		—		—		1,629,134		—		—	$	1,629,134

Consumer:
Home equity lines and loans:
Current	$	773		3,983		1,591		2,016		162		51,554		2,569,621		1,252,185	$	3,881,885
30-89 days past due		—		—		—		—		—		1,148		939		22,242		24,329
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		6,148		5,752		67,492		79,392
Total home equity lines and loans	$	773		3,983		1,591		2,016		162		58,850		2,576,312		1,341,919	$	3,985,606

4. Loans and leases and the allowance for credit losses, continued

	Term Loans by Origination Year												Revolving		Revolving Loans Converted to Term
	2020		2019		2018		2017		2016		Prior		Loans		Loans		Total
	(In thousands)
Recreational finance:
Current	$	2,796,359		1,751,766		907,595		630,151		352,414		564,358		—		—	$	7,002,643
30-89 days past due		9,548		11,255		8,519		6,638		2,938		8,263		—		—		47,161
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		1,854		3,883		4,072		4,194		2,733		8,783		—		—		25,519
Total recreational finance	$	2,807,761		1,766,904		920,186		640,983		358,085		581,404		—		—	$	7,075,323
Automobile:
Current	$	1,595,636		1,106,782		629,338		440,604		171,017		63,972		—		—	$	4,007,349
30-89 days past due		6,461		14,140		12,542		12,899		6,373		3,083		—		—		55,498
Accruing loans past due 90 days or more		—		—		—		—		—		—		—		—		—
Nonaccrual		1,615		7,144		10,788		10,061		5,991		3,805		—		—		39,404
Total automobile	$	1,603,712		1,128,066		652,668		463,564		183,381		70,860		—		—	$	4,102,251

Other:
Current	$	160,424		137,617		53,702		32,556		4,526		28,970		927,217		1,856	$	1,346,868
30-89 days past due		1,879		1,130		577		2,301		42		557		10,594		481		17,561
Accruing loans past due 90 days or more		—		—		—		—		—		374		4,207		—		4,581
Nonaccrual		1,493		492		339		183		31		501		35,044		148		38,231
Total other	$	163,796		139,239		54,618		35,040		4,599		30,402		977,062		2,485	$	1,407,241

Total loans and leases at December 31, 2020	$	20,949,019		15,628,942		10,466,749		7,893,838		6,013,013		19,233,367		16,963,561		1,387,378	$	98,535,867

Changes in Allowance for Credit Losses

Changes in the allowance for credit losses for the three months ended June 30, 2021 were as follows:

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

Beginning balance	$	328,994			716,098			89,789			501,325		$	1,636,206
Provision for credit losses		15,100			(24,805	)		(12,069	)		6,774			(15,000	)
Net charge-offs
Charge-offs		(40,095	)		(12,523	)		(2,262	)		(25,489	)		(80,369	)
Recoveries		10,853			1,193			2,411			19,834			34,291
Net (charge-offs) recoveries		(29,242	)		(11,330	)		149			(5,655	)		(46,078	)
Ending balance	$	314,852			679,963			77,869			502,444		$	1,575,128

4. Loans and leases and the allowance for credit losses, continued

Changes in the allowance for credit losses for the three months ended June 30, 2020 were as follows:

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

Beginning balance	$	358,092			433,689			115,792			476,793		$	1,384,366
Provision for credit losses		69,400			159,090			2,850			93,660			325,000
Net charge-offs
Charge-offs		(32,608	)		(17,472	)		(1,609	)		(39,708	)		(91,397	)
Recoveries		3,373			1,014			1,888			13,992			20,267
Net (charge-offs) recoveries		(29,235	)		(16,458	)		279			(25,716	)		(71,130	)
Ending balance	$	398,257			576,321			118,921			544,737		$	1,638,236

Changes in the allowance for credit losses for the six months ended June 30, 2021 were as follows:

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

Beginning balance	$	405,846			670,719			103,590			556,232		$	1,736,387
Provision for credit losses		(57,318	)		74,666			(25,504	)		(31,844	)		(40,000	)
Net charge-offs
Charge-offs		(67,040	)		(73,175	)		(4,661	)		(58,418	)		(203,294	)
Recoveries		33,364			7,753			4,444			36,474			82,035
Net charge-offs		(33,676	)		(65,422	)		(217	)		(21,944	)		(121,259	)
Ending balance	$	314,852			679,963			77,869			502,444		$	1,575,128

Changes in the allowance for credit losses for the six months ended June 30, 2020 were as follows:

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

Beginning balance	$	366,094			322,201			56,033			229,118			77,625		$	1,051,071
Adoption of new accounting standard		(61,474	)		23,656			53,896			194,004			(77,625	)		132,457
Provision for credit losses		135,994			247,756			12,141			179,109			—			575,000
Net charge-offs
Charge-offs		(48,991	)		(18,744	)		(6,711	)		(84,655	)		—			(159,101	)
Recoveries		6,634			1,452			3,562			27,161			—			38,809
Net charge-offs		(42,357	)		(17,292	)		(3,149	)		(57,494	)		—			(120,292	)
Ending balance	$	398,257			576,321			118,921			544,737			—		$	1,638,236

Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans

4. Loans and leases and the allowance for credit losses, continued

	June 30, 2021						March 31, 2021		January 1, 2021		Three Months Ended June 30, 2021		Six Months Ended June 30, 2021
	Amortized Cost with Allowance		Amortized Cost without Allowance		Total		Amortized Cost		Amortized Cost		Interest Income Recognized		Interest Income Recognized
	(In thousands)

Commercial, financial, leasing, etc.	$	210,294	$	119,746	$	330,040	$	295,069	$	306,827	$	2,930	$	6,015
Real estate:
Commercial		366,166		715,380		1,081,546		824,079		775,894		604		2,262
Residential builder and developer		1,093		13,459		14,552		1,224		1,094		—		33
Other commercial construction		20,717		113,041		133,758		126,225		114,039		274		315
Residential		191,965		180,179		372,144		385,508		365,729		6,296		10,794
Residential — limited documentation		85,683		51,000		136,683		143,069		147,170		157		236
Consumer:
Home equity lines and loans		38,860		37,851		76,711		79,188		79,392		993		1,945
Recreational finance		16,620		6,656		23,276		27,218		25,519		159		314
Automobile		27,609		3,481		31,090		38,219		39,404		48		97
Other		42,096		161		42,257		37,307		38,231		143		323
Total	$	1,001,103	$	1,240,954	$	2,242,057	$	1,957,106	$	1,893,299	$	11,604	$	22,334

	June 30, 2020						March 31, 2020		January 1, 2020		Three Months Ended June 30, 2020		Six Months Ended June 31, 2020
	Amortized Cost with Allowance		Amortized Cost without Allowance		Total		Amortized Cost		Amortized Cost		Interest Income Recognized		Interest Income Recognized
	(In thousands)

Commercial, financial, leasing, etc.	$	138,556	$	146,098	$	284,654	$	286,647	$	346,743	$	1,298	$	3,036
Real estate:
Commercial		57,675		114,813		172,488		188,469		173,796		4,697		5,789
Residential builder and developer		1,748		—		1,748		3,204		4,708		11		59
Other commercial construction		42,969		42,457		85,426		34,935		35,881		5,716		6,577
Residential		80,772		226,135		306,907		293,638		322,504		5,029		11,848
Residential — limited documentation		26,460		92,235		118,695		119,317		114,667		256		457
Consumer:
Home equity lines and loans		38,890		38,204		77,094		63,071		65,039		760		2,219
Recreational finance		16,264		7,888		24,152		13,405		14,308		154		306
Automobile		35,510		7,226		42,736		19,251		21,293		45		92
Other		7,747		35,003		42,750		39,811		35,394		161		315
Total	$	446,591	$	710,059	$	1,156,650	$	1,061,748	$	1,134,333	$	18,127	$	30,698

Loan Modification Activities that were Considered Troubled Debt Restructurings

					Post-modification (a)
	Number		Pre- modification Recorded Investment		Principal Deferral		Interest Rate Reduction		Other		Combination of Concession Types		Total
Three Months Ended June 30, 2021	(Dollars in thousands)

Commercial, financial, leasing, etc.		89	$	70,749	$	11,439	$	—	$	222	$	58,787	$	70,448
Real estate:
Commercial		35		143,141		7,370		—		28,356		106,435		142,161
Other commercial construction		3		542		532		—		—		—		532
Residential		117		34,041		29,573		—		—		4,290		33,863
Residential — limited documentation		3		405		405		—		—		—		405
Consumer:
Home equity lines and loans		16		1,970		1,970		—		—		—		1,970
Recreational finance		34		1,119		1,119		—		—		—		1,119
Automobile		94		1,502		1,502		—		—		—		1,502
Other		101		836		836		—		—		—		836
Total		492	$	254,305	$	54,746	$	—	$	28,578	$	169,512	$	252,836


Three Months Ended June 30, 2020

Commercial, financial, leasing, etc.		135	$	55,136	$	17,551	$	—	$	31,605	$	5,514	$	54,670
Real estate:
Commercial		46		41,872		10,511		333		4,800		16,348		31,992
Residential builder and developer		1		91		—		—		—		90		90
Residential		25		8,872		3,101		—		—		6,533		9,634
Consumer:
Home equity lines and loans		120		7,571		147		—		—		7,437		7,584
Recreational finance		271		10,795		10,795		—		—		—		10,795
Automobile		1,461		26,352		26,352		—		—		—		26,352
Other		335		2,183		682		—		—		1,501		2,183
Total		2,394	$	152,872	$	69,139	$	333	$	36,405	$	37,423	$	143,300

4. Loans and leases and the allowance for credit losses, continued

					Post-modification (a)
	Number		Pre- modification Recorded Investment		Principal Deferral		Interest Rate Reduction		Other		Combination of Concession Types		Total
Six Months Ended June 30, 2021	(Dollars in thousands)

Commercial, financial, leasing, etc.		182	$	124,482	$	36,092	$	—	$	222	$	87,291	$	123,605
Real estate:
Commercial		68		170,011		18,530		—		30,570		118,857		167,957
Other commercial construction		3		542		532		—		—		—		532
Residential		240		73,624		68,130		—		—		5,407		73,537
Residential — limited documentation		13		1,521		1,464		—		—		—		1,464
Consumer:
Home equity lines and loans		42		3,685		3,456		—		—		174		3,630
Recreational finance		106		3,331		3,331		—		—		—		3,331
Automobile		370		6,471		6,457		—		—		14		6,471
Other		323		2,270		2,270		—		—		—		2,270
Total		1,347	$	385,937	$	140,262	$	—	$	30,792	$	211,743	$	382,797

Six Months Ended June 30, 2020

Commercial, financial, leasing, etc.		167	$	67,828	$	22,617	$	—	$	31,605	$	12,501	$	66,723
Real estate:
Commercial		56		81,514		11,866		333		4,800		52,316		69,315
Residential builder and developer		1		91		—		—		—		90		90
Residential		52		19,050		6,348		—		—		15,510		21,858
Residential — limited documentation		9		2,980		2,667		—		—		1,232		3,899
Consumer:
Home equity lines and loans		126		8,309		559		—		—		7,771		8,330
Recreational finance		274		10,885		10,885		—		—		—		10,885
Automobile		1,470		26,534		26,534		—		—		—		26,534
Other		335		2,183		682		—		—		1,501		2,183
Total		2,490	$	219,374	$	82,158	$	333	$	36,405	$	90,921	$	209,817

(a)	Financial effects impacting the recorded investment included principal payments or advances, charge-offs and capitalized escrow arrearages. The present value of interest rate concessions, discounted at the effective rate of the original loan, was not material.

Revenue from contracts with customers (Tables)

6 Months Ended

Jun. 30, 2021

ASU 2014-09 [Member]

Summary of Sources of Noninterest Income that are Subject to Noted Accounting Guidance

	Business Banking		Commercial Banking		Commercial Real Estate		Discretionary Portfolio		Residential Mortgage Banking		Retail Banking		All Other			Total
Three Months Ended June 30, 2021	(In thousands)

Classification in consolidated statement of income
Service charges on deposit accounts	$	12,942		24,955		2,898		—		—		56,586		1,137		$	98,518
Trust income		—		—		—		—		—		—		162,991			162,991
Brokerage services income		—		—		—		—		—		20		10,245			10,265
Other revenues from operations:
Merchant discount and credit card fees		13,713		14,435		500		—		—		5,908		(454	)		34,102
Other		—		1,053		1,926		376		1,447		6,012		9,197			20,011
	$	26,655		40,443		5,324		376		1,447		68,526		183,116		$	325,887
Three Months Ended June 30, 2020

Classification in consolidated statement of income
Service charges on deposit accounts	$	11,271		22,514		2,565		—		—		40,024		1,081		$	77,455
Trust income		6		137		—		—		—		—		151,739			151,882
Brokerage services income		—		—		—		—		—		—		10,463			10,463
Other revenues from operations:
Merchant discount and credit card fees		8,159		8,891		379		—		—		3,450		176			21,055
Other		—		787		1,188		150		1,052		3,166		9,421			15,764
	$	19,436		32,329		4,132		150		1,052		46,640		172,880		$	276,619

6. Revenue from contracts with customers, continued

	Business Banking		Commercial Banking		Commercial Real Estate		Discretionary Portfolio		Residential Mortgage Banking		Retail Banking		All Other			Total
Six Months Ended June 30, 2021	(In thousands)

Classification in consolidated statement of income
Service charges on deposit accounts	$	25,439		49,250		5,791		—		—		108,038		2,777		$	191,295
Trust income		—		—		—		—		—		—		319,013			319,013
Brokerage services income		—		—		—		—		—		20		23,358			23,378
Other revenues from operations:
Merchant discount and credit card fees		23,194		24,842		945		—		—		9,829		(345	)		58,465
Other		—		2,011		3,017		760		3,169		11,819		22,145			42,921
	$	48,633		76,103		9,753		760		3,169		129,706		366,948		$	635,072
Six Months Ended June 30, 2020
Classification in consolidated statement of income

Service charges on deposit accounts	$	26,521		46,671		5,377		—		—		101,694		3,353		$	183,616
Trust income		18		441		—		—		—		—		300,174			300,633
Brokerage services income		—		—		—		—		—		—		23,592			23,592
Other revenues from operations:
Merchant discount and credit card fees		18,490		22,207		1,228		—		—		5,721		576			48,222
Other		—		2,973		2,031		1,007		1,974		9,148		21,937			39,070
	$	45,029		72,292		8,636		1,007		1,974		116,563		349,632		$	595,133

Pension plans and other postretirement benefits (Tables)

6 Months Ended

Jun. 30, 2021

Compensation And Retirement Disclosure [Abstract]

Net Periodic Defined Benefit Cost for Defined Benefit Plans

Net periodic defined benefit cost for defined benefit plans consisted of the following:

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30
	2021			2020			2021			2020
	(In thousands)

Service cost	$	5,234			5,258			258			262
Interest cost on projected benefit obligation		15,502			17,824			329			451
Expected return on plan assets		(35,774	)		(31,281	)		—			—
Amortization of prior service cost (credit)		151			154			(1,194	)		(1,194	)
Amortization of net actuarial loss (gain)		22,359			15,098			(347	)		(318	)
Net periodic cost (benefit)	$	7,472			7,053			(954	)		(799	)

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30
	2021			2020			2021			2020
	(In thousands)

Service cost	$	10,257			9,972			506			485
Interest cost on projected benefit obligation		30,936			35,710			656			870
Expected return on plan assets		(71,724	)		(62,756	)		—			—
Amortization of prior service cost (credit)		276			279			(2,369	)		(2,369	)
Amortization of net actuarial loss (gain)		44,509			29,048			(647	)		(618	)
Net periodic cost (benefit)	$	14,254			12,253			(1,854	)		(1,632	)

Earnings per common share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Three Months Ended June 30						Six Months Ended June 30
	2021			2020			2021			2020
	(In thousands, except per share)

Income available to common shareholders:
Net income	$	458,069			241,054			905,318			509,876
Less: Preferred stock dividends		(17,050	)		(17,050	)		(34,100	)		(34,128	)
Net income available to common equity		441,019			224,004			871,218			475,748
Less: Income attributable to unvested stock-based compensation awards		(2,263	)		(906	)		(4,370	)		(1,954	)
Net income available to common shareholders	$	438,756			223,098			866,848			473,794
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		129,589			129,059			129,502			129,750
Less: Unvested stock-based compensation awards		(918	)		(784	)		(898	)		(764	)
Weighted-average shares outstanding		128,671			128,275			128,604			128,986

Basic earnings per common share	$	3.41			1.74			6.74			3.67

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Three Months Ended June 30						Six Months Ended June 30
	2021			2020			2021			2020
	(In thousands, except per share)

Net income available to common equity	$	441,019			224,004			871,218			475,748
Less: Income attributable to unvested stock-based compensation awards		(2,260	)		(905	)		(4,366	)		(1,953	)
Net income available to common shareholders	$	438,759			223,099			866,852			473,795
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		129,589			129,059			129,502			129,750
Less: Unvested stock-based compensation awards		(918	)		(784	)		(898	)		(764	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock		171			58			152			58
Adjusted weighted-average shares outstanding		128,842			128,333			128,756			129,044

Diluted earnings per common share	$	3.41			1.74			6.73			3.67

Comprehensive income (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income

The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income:

	Investment			Defined Benefit						Total Amount				Income
	Securities			Plans			Other			Before Tax				Tax			Net
	(In thousands)

Balance — January 1, 2021	$	195,386			(650,087	)		369,558		$	(85,143	)			22,111		$	(63,032	)
Other comprehensive income before reclassifications:
Unrealized holding losses, net		(43,732	)		—			—			(43,732	)			11,596			(32,136	)
Foreign currency translation adjustment		—			—			881			881				(188	)		693
Unrealized losses on cash flow hedges		—			—			(5,969	)		(5,969	)			1,565			(4,404	)
Total other comprehensive income (loss) before reclassifications		(43,732	)		—			(5,088	)		(48,820	)			12,973			(35,847	)
Amounts reclassified from accumulated other comprehensive income that (increase) decrease net income:
Amortization of unrealized holding losses on held-to-maturity (“HTM”) securities		2,232			—			—			2,232		(a)		(587	)		1,645
Gains realized in net income		(4	)		—			—			(4	)	(b)		1			(3	)
Accretion of net gain on terminated cash flow hedges		—			—			(60	)		(60	)	(c)		17			(43	)
Net yield adjustment from cash flow hedges currently in effect		—			—			(148,655	)		(148,655	)	(a)		38,965			(109,690	)
Amortization of prior service credit		—			(2,093	)		—			(2,093	)	(d)		590			(1,503	)
Amortization of actuarial losses		—			43,862			—			43,862		(d)		(12,363	)		31,499
Total other comprehensive income (loss)		(41,504	)		41,769			(153,803	)		(153,538	)			39,596			(113,942	)
Balance — June 30, 2021	$	153,882			(608,318	)		215,755		$	(238,681	)			61,707		$	(176,974	)


Balance — January 1, 2020	$	50,701			(464,548	)		133,888		$	(279,959	)			73,279		$	(206,680	)
Other comprehensive income before reclassifications:
Unrealized holding gains, net		177,086			—			—			177,086				(45,856	)		131,230
Foreign currency translation adjustment		—			—			(3,624	)		(3,624	)			630			(2,994	)
Unrealized gains on cash flow hedges		—			—			511,195			511,195				(132,404	)		378,791
Total other comprehensive income before reclassifications		177,086			—			507,571			684,657				(177,630	)		507,027
Amounts reclassified from accumulated other comprehensive income that (increase) decrease net income:
Amortization of unrealized holding losses on HTM securities		1,619			—			—			1,619		(a)		(450	)		1,169
Accretion of net gain on terminated cash flow hedges		—			—			(64	)		(64	)	(c)		18			(46	)
Net yield adjustment from cash flow hedges currently in effect		—			—			(101,194	)		(101,194	)	(a)		26,210			(74,984	)
Amortization of prior service credit		—			(2,090	)		—			(2,090	)	(d)		650			(1,440	)
Amortization of actuarial losses		—			28,430			—			28,430		(d)		(8,846	)		19,584
Total other comprehensive income		178,705			26,340			406,313			611,358				(160,048	)		451,310
Balance — June 30, 2020	$	229,406			(438,208	)		540,201		$	331,399				(86,769	)	$	244,630

(a)	Included in interest income.

(b)	Included in gain (loss) on bank investment securities.

(c)	Included in interest expense.

(d)	Included in other costs of operations.

Accumulated Other Comprehensive Income (Loss), Net

Accumulated other comprehensive income (loss), net consisted of the following:

				Defined
	Investment			Benefit
	Securities			Plans			Other			Total
	(In thousands)

Balance — December 31, 2020	$	144,602		$	(481,064	)	$	273,430		$	(63,032	)
Net gain (loss) during period		(30,494	)		29,996			(113,444	)		(113,942	)
Balance — June 30, 2021	$	114,108		$	(451,068	)	$	159,986		$	(176,974	)

Derivative financial instruments (Tables)

6 Months Ended

Jun. 30, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Information about Interest Rate Swap Agreements

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


					Weighted-						Estimated
	Notional		Average		Average Rate						Fair Value
	Amount		Maturity		Fixed			Variable			Gain (Loss) (a)
	(In thousands)		(In years)								(In thousands)
June 30, 2021
Fair value hedges:
Fixed rate long-term borrowings (b)	$	1,650,000		2.8		2.86	%		0.73	%	$	738
Cash flow hedges:
Interest payments on variable rate commercial real estate loans (b)(c)		32,200,000		0.8		1.43	%		0.09	%		190
Total	$	33,850,000		0.9							$	928
December 31, 2020
Fair value hedges:
Fixed rate long-term borrowings (b)	$	1,650,000		3.3		2.86	%		0.79	%	$	651
Cash flow hedges:
Interest payments on variable rate commercial real estate loans (b)(d)		49,400,000		0.9		2.22	%		0.15	%		425
Total	$	51,050,000		1.0							$	1,076

(a)

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

(c)	Includes notional amount and terms of $14.9 billion of forward-starting interest rate swap agreements that become effective in 2021 - 2022.

(d)	Includes notional amount and terms of $32.1 billion of forward-starting interest rate swap agreements that become effective in 2021 - 2022.

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
	June 30,		December 31,		June 30,		December 31,
	2021		2020		2021		2020
	(In thousands)
Derivatives designated and qualifying as hedging instruments
Interest rate swap agreements (a)	$	1,745	$	1,968	$	817	$	892
Commitments to sell real estate loans (a)		1,353		1,488		1,814		8,458
		3,098		3,456		2,631		9,350
Derivatives not designated and qualifying as hedging instruments
Mortgage-related commitments to originate real estate loans for sale (a)		39,262		43,599		3,596		365
Commitments to sell real estate loans (a)		5,522		2,409		7,532		13,868
Trading:
Interest rate contracts (b)		653,557		1,008,913		89,542		105,768
Foreign exchange and other option and futures contracts (b)		9,457		9,608		11,729		11,134
		707,798		1,064,529		112,399		131,135
Total derivatives	$	710,896	$	1,067,985	$	115,030	$	140,485

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

(b)

	Carrying Amount of the Hedged Item				Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item
	June 30, 2021		December 31, 2020		June 30, 2021		December 31, 2020
	(In thousands)
Location in the Consolidated Balance Sheet of the Hedged Items in Fair Value Hedges

Long-term debt	$	1,718,333	$	1,750,048	$	69,350	$	101,326

Information about Fair Values of Derivative Instruments in Consolidated Statement of Income

10. Derivative financial instruments, continued

	Amount of Gain (Loss) Recognized
	Three Months Ended June 30, 2021					Three Months Ended June 30, 2020
	Derivative			Hedged Item		Derivative		Hedged Item
	(In thousands)
Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	154			(78)	$	117		(605	)
Derivatives not designated as hedging instruments
Trading:
Interest rate contracts (b)	$	(2,744	)			$	978
Foreign exchange and other option and futures contracts (b)		1,618					717
Total	$	(1,126	)			$	1,695


	Amount of Gain (Loss) Recognized
	Six Months Ended June 30, 2021					Six Months Ended June 30, 2020
	Derivative			Hedged Item		Derivative		Hedged Item
	(In thousands)
Derivatives in fair value hedging relationships
Interest rate swap agreements:
Fixed rate long-term borrowings (a)	$	(32,504	)		31,820	$	88,827		(88,429	)
Derivatives not designated as hedging instruments
Trading:
Interest rate contracts (b)	$	(5,978	)			$	13,764
Foreign exchange and other option and futures contracts (b)		3,226					5,069
Total	$	(2,752	)			$	18,833

(a)

Reported as an adjustment to interest expense.

(b)

Reported as trading account and foreign exchange gains.

Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis

The following tables present assets and liabilities at June 30, 2021 and December 31, 2020 measured at estimated fair value on a recurring basis:

	Fair Value Measurements		Level 1		Level 2		Level 3
	(In thousands)
June 30, 2021
Trading account assets	$	712,558	$	49,544	$	663,014	$	—
Investment securities available for sale:
U.S. Treasury and federal agencies		7,023		—		7,023		—
Mortgage-backed securities:
Government issued or guaranteed		3,820,490		—		3,820,490		—
Other debt securities		132,270		—		132,270		—
		3,959,783		—		3,959,783		—
Equity securities		78,671		71,917		6,754		—
Real estate loans held for sale		884,355		—		884,355		—
Other assets (a)		47,882		—		8,620		39,262
Total assets	$	5,683,249	$	121,461	$	5,522,526	$	39,262
Trading account liabilities	$	101,271	$	—	$	101,271	$	—
Other liabilities (a)		13,759		—		10,163		3,596
Total liabilities	$	115,030	$	—	$	111,434	$	3,596

December 31, 2020
Trading account assets	$	1,068,581	$	50,060	$	1,018,521	$	—
Investment securities available for sale:
U.S. Treasury and federal agencies		9,338		—		9,338		—
Mortgage-backed securities:
Government issued or guaranteed		4,683,438		—		4,683,438		—
Privately issued		16		—		—		16
Other debt securities		129,814		—		129,814		—
		4,822,606		—		4,822,590		16
Equity securities		92,985		63,129		29,856		—
Real estate loans held for sale		1,054,676		—		1,054,676		—
Other assets (a)		49,464		—		5,865		43,599
Total assets	$	7,088,312	$	113,189	$	6,931,508	$	43,615
Trading account liabilities	$	116,902	$	—	$	116,902	$	—
Other liabilities (a)		23,583		—		23,218		365
Total liabilities	$	140,485	$	—	$	140,120	$	365

(a)	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 Three Assets And Liabilities Measured At Estimated Fair Value On Recurring Basis

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three months ended June 30, 2021 and 2020 were as follows:

	Investment Securities Available for Sale
	Privately Issued Mortgage-Backed Securities			Other Assets and Other Liabilities
2021	(In thousands)

Balance — March 31, 2021	$	16			13,757
Total gains realized/unrealized:
Included in earnings		—			52,312		(a)
Settlements		(16	)		—
Transfers out of Level 3		—			(30,403	)	(b)
Balance — June 30, 2021	$	—			35,666
Changes in unrealized gains included in earnings related to assets still held at June 30, 2021	$	—			37,300		(a)

2020

Balance — March 31, 2020	$	16	35,027
Total gains realized/unrealized:
Included in earnings		—	48,732		(a)
Transfers out of Level 3		—	(43,653	)	(b)
Balance — June 30, 2020	$	16	40,106
Changes in unrealized gains included in earnings related to assets still held at June 30, 2020	$	—	33,725		(a)

The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the six months ended June 30, 2021 and 2020 were as follows:

	Investment Securities Available for Sale
	Privately Issued Mortgage-Backed Securities			Other Assets and Other Liabilities
2021	(In thousands)

Balance — January 1, 2021	$	16			43,234
Total gains realized/unrealized:
Included in earnings		—			58,337		(a)
Settlements		(16	)		—
Transfers out of Level 3		—			(65,905	)	(b)
Balance — June 30, 2021	$	—			35,666
Changes in unrealized gains included in earnings related to assets still held at June 30, 2021	$	—			35,492		(a)

2020

Balance — January 1, 2020	$	16	10,740
Total gains realized/unrealized:
Included in earnings		—	92,813		(a)
Transfers out of Level 3		—	(63,447	)	(b)
Balance — June 30, 2020	$	16	40,106
Changes in unrealized gains included in earnings related to assets still held at June 30, 2020	$	—	38,514		(a)

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

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

Quantitative Information Related To Significant Unobservable Inputs

Fair Value

Valuation

Technique

Unobservable

Inputs/Assumptions

Range

(Weighted-

Average)

(In thousands)

June 30, 2021

Recurring fair value measurements

Net other assets (liabilities) (a)

35,666

Discounted cash flow

Commitment expirations

0% - 91% (16%)

December 31, 2020

Recurring fair value measurements

Privately issued mortgage-

backed securities

Two independent pricing quotes

—

Net other assets (liabilities) (a)

43,234

Discounted cash flow

Commitment expirations

0% - 98% (16%)

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

Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities)

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

	June 30, 2021
	Carrying Amount			Estimated Fair Value			Level 1		Level 2			Level 3
	(In thousands)
Financial assets:
Cash and cash equivalents	$	1,410,468			1,410,468			1,291,665		118,803			—
Interest-bearing deposits at banks		33,864,824			33,864,824			—		33,864,824			—
Trading account assets		712,558			712,558			49,544		663,014			—
Investment securities		6,143,177			6,209,993			71,917		6,073,252			64,824
Loans and leases:
Commercial loans and leases		25,409,291			25,174,858			—		—			25,174,858
Commercial real estate loans		37,558,775			36,777,235			—		205,591			36,571,644
Residential real estate loans		16,704,951			16,865,571			—		3,834,635			13,030,936
Consumer loans		17,440,415			17,541,515			—		—			17,541,515
Allowance for credit losses		(1,575,128	)		—			—		—			—
Loans and leases, net		95,538,304			96,359,179			—		4,040,226			92,318,953
Accrued interest receivable		409,745			409,745			—		409,745			—
Financial liabilities:
Noninterest-bearing deposits	$	(55,621,230	)		(55,621,230	)		—		(55,621,230	)		—
Savings and interest-checking deposits		(69,491,942	)		(69,491,942	)		—		(69,491,942	)		—
Time deposits		(3,155,600	)		(3,163,772	)		—		(3,163,772	)		—
Short-term borrowings		(91,235	)		(91,235	)		—		(91,235	)		—
Long-term borrowings		(3,499,448	)		(3,609,147	)		—		(3,609,147	)		—
Accrued interest payable		(48,677	)		(48,677	)		—		(48,677	)		—
Trading account liabilities		(101,271	)		(101,271	)		—		(101,271	)		—
Other financial instruments:
Commitments to originate real estate loans for sale	$	35,666			35,666			—		—			35,666
Commitments to sell real estate loans		(2,471	)		(2,471	)		—		(2,471	)		—
Other credit-related commitments		(131,136	)		(131,136	)		—		—			(131,136	)
Interest rate swap agreements used for interest rate risk management		928			928			—		928			—

12. Fair value measurements, continued

	December 31, 2020
	Carrying Amount			Estimated Fair Value			Level 1		Level 2			Level 3
				(In thousands)
Financial assets:
Cash and cash equivalents	$	1,552,743			1,552,743			1,497,457		55,286			—
Interest-bearing deposits at banks		23,663,810			23,663,810			—		23,663,810			—
Trading account assets		1,068,581			1,068,581			50,060		1,018,521			—
Investment securities		7,045,697			7,138,989			63,129		7,005,571			70,289
Loans and leases:
Commercial loans and leases		27,574,564			27,220,699			—		—			27,220,699
Commercial real estate loans		37,637,889			36,816,580			—		277,911			36,538,669
Residential real estate loans		16,752,993			17,089,141			—		4,135,655			12,953,486
Consumer loans		16,570,421			16,554,050			—		—			16,554,050
Allowance for credit losses		(1,736,387	)		—			—		—			—
Loans and leases, net		96,799,480			97,680,470			—		4,413,566			93,266,904
Accrued interest receivable		419,936			419,936			—		419,936			—
Financial liabilities:
Noninterest-bearing deposits	$	(47,572,884	)		(47,572,884	)		—		(47,572,884	)		—
Savings and interest-checking deposits		(67,680,840	)		(67,680,840	)		—		(67,680,840	)		—
Time deposits		(3,899,910	)		(3,919,367	)		—		(3,919,367	)		—
Deposits at Cayman Islands office		(652,104	)		(652,104	)		—		(652,104	)		—
Short-term borrowings		(59,482	)		(59,482	)		—		(59,482	)		—
Long-term borrowings		(4,382,193	)		(4,490,433	)		—		(4,490,433	)		—
Accrued interest payable		(59,916	)		(59,916	)		—		(59,916	)		—
Trading account liabilities		(116,902	)		(116,902	)		—		(116,902	)		—
Other financial instruments:
Commitments to originate real estate loans for sale	$	43,234			43,234			—		—			43,234
Commitments to sell real estate loans		(18,429	)		(18,429	)		—		(18,429	)		—
Other credit-related commitments		(133,354	)		(133,354	)		—		—			(133,354	)
Interest rate swap agreements used for interest rate risk management		1,076			1,076			—		1,076			—

Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities Outstanding

The following table presents the Company's significant commitments. Certain of these commitments are not included in the Company's consolidated balance sheet.

	June 30,		December 31,
	2021		2020
	(In thousands)
Commitments to extend credit
Home equity lines of credit	$	5,677,025	$	5,563,854
Commercial real estate loans to be sold		445,249		363,735
Other commercial real estate		6,077,907		7,237,367
Residential real estate loans to be sold		1,022,844		1,026,118
Other residential real estate		942,654		665,259
Commercial and other		21,003,234		19,427,886
Standby letters of credit		2,269,907		2,241,417
Commercial letters of credit		30,893		27,332
Financial guarantees and indemnification contracts		4,199,215		4,220,531
Commitments to sell real estate loans		2,017,837		2,108,823

Segment information (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Information about Company's Segments

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

	Three Months Ended June 30
	2021							2020
	Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)		Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)
	(In thousands)

Business Banking	$	145,098		794			41,607	$	138,086		144			37,563
Commercial Banking		284,659		1,012			111,035		287,525		249			111,030
Commercial Real Estate		200,559		230			86,690		227,113		60			107,083
Discretionary Portfolio		118,307		(10,079	)		78,532		138,827		(9,861	)		95,691
Residential Mortgage Banking		146,682		22,875			30,103		142,045		21,016			37,400
Retail Banking		350,988		281			89,200		353,521		267			86,498
All Other		209,680		(15,113	)		20,902		157,293		(11,875	)		(234,211	)
Total	$	1,455,973		—			458,069	$	1,444,410		—			241,054

	Six Months Ended June 30
	2021							2020
	Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)		Total Revenues(a)		Inter- segment Revenues			Net Income (Loss)
	(In thousands)

Business Banking	$	301,001		1,463			87,878	$	275,919		1,029			70,489
Commercial Banking		570,571		1,821			233,673		579,301		1,302			254,762
Commercial Real Estate		401,402		452			157,962		450,418		469			224,491
Discretionary Portfolio		252,851		(20,106	)		169,078		188,046		(22,898	)		121,359
Residential Mortgage Banking		300,442		45,058			79,714		267,606		42,433			62,016
Retail Banking		697,905		553			174,558		756,204		534			196,744
All Other		418,794		(29,241	)		2,455		433,081		(22,869	)		(419,985	)
Total	$	2,942,966		—			905,318	$	2,950,575		—			509,876

	Average Total Assets
	Six Months Ended June 30				Year Ended December 31
	2021		2020		2020
	(In millions)

Business Banking	$	8,681		7,235		8,152
Commercial Banking		29,927		30,603		30,338
Commercial Real Estate		25,999		25,340		25,792
Discretionary Portfolio		22,769		26,821		27,726
Residential Mortgage Banking		6,638		3,113		4,038
Retail Banking		17,444		16,039		16,438
All Other		37,948		19,362		22,996
Total	$	149,406		128,513		135,480

(a)

Acquisition - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 22, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Peoples United Financial Inc
Business Acquisition [Line Items]
Business combination, market value	$ 7,400
Common stock, price per share		$ 145.31		$ 145.31
Assets		$ 63,300		$ 63,300
Loans		41,400		41,400
Deposits		52,600		52,600
Liabilities		55,600		55,600
Stockholders' equity				$ 7,700
Peoples United Financial Inc \| Investment Banking, Legal and Other Services [Member]
Business Acquisition [Line Items]
Merger-related expenses		$ 4	$ 10
MT
Business Acquisition [Line Items]
Common stock, price per share	$ 0.118

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	$ 3,801,940	$ 4,621,027
Investment securities available for sale, gross unrealized gains	165,147	210,649
Investment securities available for sale, gross unrealized losses	7,304	9,070
Investment securities available for sale, estimated fair value	3,959,783	4,822,606
Amortized cost for held to maturity	1,718,198	1,748,989
Gross unrealized gains for held to maturity	81,715	111,241
Gross unrealized losses for held to maturity	14,899	17,949
Estimated fair value for held to maturity	1,785,014	1,842,281
Equity and other securities, Amortized Cost	463,043	449,008
Equity securities, Gross Unrealized Gains	2,896	25,094
Equity securities, Gross Unrealized Losses	743
Equity and other securities, Estimated Fair Value	465,196	474,102
Other securities, Amortized cost	386,525	381,117
Other securities, Estimated fair value	386,525	381,117
Total debt securities Amortized cost	5,520,138	6,370,016
Total debt securities Gross unrealized gains	246,862	321,890
Total debt securities Gross unrealized losses	22,203	27,019
Total debt securities Estimated fair value	5,744,797	6,664,887
Readily marketable securities Amortized cost	76,518	67,891
Readily marketable securities Gross unrealized gains	2,896	25,094
Readily marketable securities Gross unrealized losses	743
Readily marketable securities Estimated fair value	78,671	92,985
U.S. Treasury and Federal Agencies [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	6,877	9,154
Investment securities available for sale, gross unrealized gains	147	198
Investment securities available for sale, gross unrealized losses	1	14
Investment securities available for sale, estimated fair value	7,023	9,338
Amortized cost for held to maturity	3,080	2,999
Gross unrealized losses for held to maturity	2
Estimated fair value for held to maturity	3,078	2,999
Obligations of States and Political Subdivisions [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Amortized cost for held to maturity	546	1,531
Gross unrealized gains for held to maturity	3	9
Estimated fair value for held to maturity	549	1,540
Government Issued or Guaranteed [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	3,658,704	4,475,406
Investment securities available for sale, gross unrealized gains	162,369	208,787
Investment securities available for sale, gross unrealized losses	583	755
Investment securities available for sale, estimated fair value	3,820,490	4,683,438
Amortized cost for held to maturity	1,643,433	1,664,443
Gross unrealized gains for held to maturity	70,560	100,176
Gross unrealized losses for held to maturity	95	11
Estimated fair value for held to maturity	1,713,898	1,764,608
Other Debt Securities [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	136,359	136,451
Investment securities available for sale, gross unrealized gains	2,631	1,664
Investment securities available for sale, gross unrealized losses	6,720	8,301
Investment securities available for sale, estimated fair value	132,270	129,814
Amortized cost for held to maturity	2,665	2,861
Estimated fair value for held to maturity	2,665	2,861
Privately Issued [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost		16
Investment securities available for sale, estimated fair value		16
Amortized cost for held to maturity	68,474	77,155
Gross unrealized gains for held to maturity	11,152	11,056
Gross unrealized losses for held to maturity	14,802	17,938
Estimated fair value for held to maturity	$ 64,824	$ 70,273

Investment Securities - Additional Information (Detail)	3 Months Ended		6 Months Ended
Investment Securities - Additional Information (Detail)	Jun. 30, 2021 USD ($) Security	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Security	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Investment Holdings [Line Items]
Gross realized gains(loss) on sale of investment securities	$ 0	$ 0	$ 0	$ 0
Gain (loss) on bank investment securities	$ (10,655,000)	$ 6,969,000	$ (22,937,000)	$ (13,813,000)
Number of debt securities with aggregate gross unrealized losses \| Security	272		272
Unrealized losses on individual debt securities			$ (22,000,000)
Cost method equity securities	$ 387,000,000		387,000,000
Available-for-Sale Securities [Member]
Investment Holdings [Line Items]
Allowance for credit losses	$ 0		$ 0		$ 0

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt securities available for sale:
Due in one year or less	$ 3,490
Due after one year through five years	11,848
Due after five years through ten years	97,898
Due after ten years	30,000
Total available for sale (amortized cost)	143,236
Mortgage-backed securities available for sale	3,658,704
Investment securities available for sale, amortized cost	3,801,940	$ 4,621,027
Debt securities held to maturity:
Due in one year or less	371
Due after one year through five years	3,255
Due after ten years	2,665
Total available for held to maturity (amortized cost)	6,291
Mortgage-backed securities held to maturity	1,711,907
Amortized cost for held to maturity	1,718,198	1,748,989
Debt securities available for sale:
Due in one year or less	3,540
Due after one year through five years	12,440
Due after five years through ten years	98,672
Due after ten years	24,641
Total available for sale (fair value)	139,293
Mortgage-backed securities available for sale	3,820,490
Total	3,959,783	4,822,606
Debt securities held to maturity:
Due in one year or less	370
Due after one year through five years	3,257
Due after ten years	2,665
Total available for held to maturity (fair value)	6,292
Mortgage-backed securities held to maturity	1,778,722
Total	$ 1,785,014	$ 1,842,281

Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	$ 6,026	$ 35,727
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(19)	(551)
Estimated fair value, 12 months or more	89,217	80,018
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(7,285)	(8,519)
Held to maturity, Estimated fair value, Less than 12 months	103,646	2,039
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	(75)	(11)
Held to maturity, Estimated fair value, 12 months or more	51,250	52,418
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	(14,824)	(17,938)
Total investment securities, fair value less than 12 months	109,672	37,766
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses	(94)	(562)
Total of investment securities, fair value, 12 Months or More	140,467	132,436
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses	(22,109)	(26,457)
U.S. Treasury and Federal Agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	1,429	985
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(1)	(14)
Held to maturity, Estimated fair value, Less than 12 months	3,078
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	(2)
Government Issued or Guaranteed [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	2,516	18,687
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(7)	(356)
Estimated fair value, 12 months or more	24,307	16,556
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(576)	(399)
Held to maturity, Estimated fair value, Less than 12 months	100,568	2,039
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	(73)	(11)
Held to maturity, Estimated fair value, 12 months or more	1,633
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	(22)
Other Debt Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	2,081	16,055
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	(11)	(181)
Estimated fair value, 12 months or more	64,910	63,462
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	(6,709)	(8,120)
Privately Issued [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Held to maturity, Estimated fair value, 12 months or more	49,617	52,418
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	$ (14,802)	$ (17,938)

Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 93,154,130	$ 95,120,921
30-89 Days Past Due	640,018	662,439
Accruing Loans Past Due 90 Days or More	1,077,227	859,208
Nonaccrual	2,242,057	1,893,299
Loans and leases, net of unearned discount	97,113,432	98,535,867
Commercial, Financial, Leasing, etc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	25,003,487	27,196,862
30-89 Days Past Due	70,202	60,822
Accruing Loans Past Due 90 Days or More	5,562	10,053
Nonaccrual	330,040	306,827
Loans and leases, net of unearned discount	25,409,291	27,574,564
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	26,112,046	26,688,515
30-89 Days Past Due	106,638	168,917
Accruing Loans Past Due 90 Days or More	36,780	47,014
Nonaccrual	1,081,546	775,894
Loans and leases, net of unearned discount	27,337,010	27,680,340
Residential Builder and Developer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,261,163	1,246,095
30-89 Days Past Due	13,773	1,693
Accruing Loans Past Due 90 Days or More	203	856
Nonaccrual	14,552	1,094
Loans and leases, net of unearned discount	1,289,691	1,249,738
Other Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	8,627,896	8,523,591
30-89 Days Past Due	165,242	66,365
Accruing Loans Past Due 90 Days or More	5,178	3,816
Nonaccrual	133,758	114,039
Loans and leases, net of unearned discount	8,932,074	8,707,811
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	13,693,812	13,764,836
30-89 Days Past Due	185,110	200,406
Accruing Loans Past Due 90 Days or More	1,026,449	792,888
Nonaccrual	372,144	365,729
Loans and leases, net of unearned discount	15,277,515	15,123,859
Residential Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,277,064	1,462,277
30-89 Days Past Due	13,689	19,687
Nonaccrual	136,683	147,170
Loans and leases, net of unearned discount	1,427,436	1,629,134
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	3,612,791	3,881,885
30-89 Days Past Due	16,043	24,329
Nonaccrual	76,711	79,392
Loans and leases, net of unearned discount	3,705,545	3,985,606
Recreational Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	7,707,774	7,002,643
30-89 Days Past Due	23,643	47,161
Nonaccrual	23,276	25,519
Loans and leases, net of unearned discount	7,754,693	7,075,323
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,429,573	4,007,349
30-89 Days Past Due	30,521	55,498
Nonaccrual	31,090	39,404
Loans and leases, net of unearned discount	4,491,184	4,102,251
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,428,524	1,346,868
30-89 Days Past Due	15,157	17,561
Accruing Loans Past Due 90 Days or More	3,055	4,581
Nonaccrual	42,257	38,231
Loans and leases, net of unearned discount	$ 1,488,993	$ 1,407,241

Loans and Leases and the Allowance for Credit Losses - Summary of Outstanding Loan Balances Related to COVID-19 Modifications Granted - (Parenthetical) (Detail) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2020

Jun. 30, 2021

Jun. 30, 2020

Financing Receivable Allowance For Credit Losses [Line Items]

Loans and leases, net of unearned discount

$ 252,836

$ 143,300

$ 382,797

$ 209,817

Payment Deferral [Member]

Financing Receivable Allowance For Credit Losses [Line Items]

Loans and leases, net of unearned discount

$ 54,746

$ 69,139

140,262

$ 82,158

COVID-19 [Member]

Financing Receivable Allowance For Credit Losses [Line Items]

Loans and leases, net of unearned discount

3,140,313

COVID-19 [Member] | Payment Deferral [Member]

Financing Receivable Allowance For Credit Losses [Line Items]

Loans and leases, net of unearned discount

^[1]

2,835,495

COVID-19 [Member] | Payment Deferral [Member] | Government-Guaranteed Loans [Member]

Financing Receivable Allowance For Credit Losses [Line Items]

Loans and leases, net of unearned discount

$ 2,000,000

[1]	Represents accruing loans at June 30, 2021 for which a COVID-19 related payment deferral (including maturity extensions) has been granted

Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Loans And Leases Receivable [Line Items]
Amount of foreclosed residential real estate property held	$ 23	$ 28
Loans secured by residential real estate that were in the process of foreclosure	$ 188	214
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed	39.00%
Minimum [Member]
Loans And Leases Receivable [Line Items]
Loan delinquent period	90 days
Minimum [Member] \| Commercial Loans and Commercial Real Estate [Member]
Loans And Leases Receivable [Line Items]
Amount of real estate loan as reported as accruing or nonaccruing	$ 1
Maximum [Member]
Loans And Leases Receivable [Line Items]
Loan delinquent period	150 days
Residential Mortgage Loans [Member] \| One-to-Four Family Residential [Member]
Loans And Leases Receivable [Line Items]
Mortgage loans held for sale	$ 679	777
Commercial Real Estate Loans [Member] \| One-to-Four Family Residential [Member]
Loans And Leases Receivable [Line Items]
Mortgage loans held for sale	$ 206	$ 278

Loans and Leases and the Allowance for Credit Losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Current	$ 93,154,130	$ 95,120,921
30-89 Days Past Due	640,018	662,439
Accruing Loans Past Due 90 Days or More	1,077,227	859,208
Nonaccrual	2,242,057	1,893,299
Loans and leases, net of unearned discount	97,113,432	98,535,867
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,558,294	16,963,561
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,275,200	1,387,378
Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Current	13,693,812	13,764,836
30-89 Days Past Due	185,110	200,406
Accruing Loans Past Due 90 Days or More	1,026,449	792,888
Nonaccrual	372,144	365,729
Loans and leases, net of unearned discount	15,277,515	15,123,859
Residential [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	52,948	71,894
Nonaccrual	284	200
Loans and leases, net of unearned discount	53,232	72,094
Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,277,064	1,462,277
30-89 Days Past Due	13,689	19,687
Nonaccrual	136,683	147,170
Loans and leases, net of unearned discount	1,427,436	1,629,134
Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	3,612,791	3,881,885
30-89 Days Past Due	16,043	24,329
Nonaccrual	76,711	79,392
Loans and leases, net of unearned discount	3,705,545	3,985,606
Home Equity Lines and Loans [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	2,405,415	2,569,621
30-89 Days Past Due		939
Nonaccrual	865	5,752
Loans and leases, net of unearned discount	2,406,280	2,576,312
Home Equity Lines and Loans [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,152,169	1,252,185
30-89 Days Past Due	15,165	22,242
Nonaccrual	69,648	67,492
Loans and leases, net of unearned discount	1,236,982	1,341,919
Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Current	7,707,774	7,002,643
30-89 Days Past Due	23,643	47,161
Nonaccrual	23,276	25,519
Loans and leases, net of unearned discount	7,754,693	7,075,323
Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Current	4,429,573	4,007,349
30-89 Days Past Due	30,521	55,498
Nonaccrual	31,090	39,404
Loans and leases, net of unearned discount	4,491,184	4,102,251
Other [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,428,524	1,346,868
30-89 Days Past Due	15,157	17,561
Accruing Loans Past Due 90 Days or More	3,055	4,581
Nonaccrual	42,257	38,231
Loans and leases, net of unearned discount	1,488,993	1,407,241
Other [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	988,950	927,217
30-89 Days Past Due	10,929	10,594
Accruing Loans Past Due 90 Days or More	2,720	4,207
Nonaccrual	39,724	35,044
Loans and leases, net of unearned discount	1,042,323	977,062
Other [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,582	1,856
30-89 Days Past Due	399	481
Nonaccrual	81	148
Loans and leases, net of unearned discount	2,062	2,485
Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,248,858	20,949,019	$ 15,343,248	$ 15,628,942	$ 14,580,702	$ 10,466,749	$ 9,384,634	$ 7,893,838	$ 7,044,703	$ 6,013,013
Term Loans [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,430,194	2,722,862	1,806,964	1,416,259	1,256,245	618,736	553,846	1,318,094	1,429,854	718,235
30-89 Days Past Due	8,415	13,496	7,020	7,781	3,224	7,258	4,072	13,477	22,795	7,947
Accruing Loans Past Due 90 Days or More		579	104,571	15,234	29,588	38,145	40,820	212,818	242,802	45,804
Nonaccrual	751	3,133	22,305	14,439	10,345	5,183	5,407	6,408	4,019	2,900
Loans and leases, net of unearned discount	1,439,360	2,740,070	1,940,860	1,453,713	1,299,402	669,322	604,145	1,550,797	1,699,470	774,886
Term Loans [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	270	773	918	3,983	3,367	1,591	2,118	2,016	2,204	162
30-89 Days Past Due					74
Loans and leases, net of unearned discount	270	773	918	3,983	3,441	1,591	2,118	2,016	2,204	162
Term Loans [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,703,496	2,796,359	2,438,212	1,751,766	1,498,033	907,595	763,757	630,151	536,566	352,414
30-89 Days Past Due	1,340	9,548	4,877	11,255	6,218	8,519	3,735	6,638	3,107	2,938
Nonaccrual	289	1,854	2,234	3,883	3,686	4,072	4,202	4,194	3,319	2,733
Loans and leases, net of unearned discount	1,705,125	2,807,761	2,445,323	1,766,904	1,507,937	920,186	771,694	640,983	542,992	358,085
Term Loans [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,271,916	1,595,636	1,359,941	1,106,782	873,543	629,338	472,973	440,604	314,078	171,017
30-89 Days Past Due	2,062	6,461	4,653	14,140	7,255	12,542	6,592	12,899	5,869	6,373
Nonaccrual	630	1,615	1,826	7,144	6,119	10,788	8,150	10,061	7,928	5,991
Loans and leases, net of unearned discount	1,274,608	1,603,712	1,366,420	1,128,066	886,917	652,668	487,715	463,564	327,875	183,381
Term Loans [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Current	118,343	160,424	127,772	137,617	103,718	53,702	37,304	32,556	23,510	4,526
30-89 Days Past Due	1,814	1,879	462	1,130	668	577	328	2,301	99	42
Nonaccrual	1,446	1,493	188	492	296	339	190	183	119	31
Loans and leases, net of unearned discount	121,603	163,796	$ 128,422	$ 139,239	$ 104,682	$ 54,618	$ 37,822	$ 35,040	$ 23,728	$ 4,599
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,677,793	19,233,367
Term Loans Prior Period [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Current	7,163,761	6,898,756
30-89 Days Past Due	139,584	150,447
Accruing Loans Past Due 90 Days or More	608,668	480,308
Nonaccrual	329,033	333,466
Loans and leases, net of unearned discount	8,241,046	7,862,977
Term Loans Prior Period [Member] \| Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
Current	1,277,064	1,462,277
30-89 Days Past Due	13,689	19,687
Nonaccrual	136,683	147,170
Loans and leases, net of unearned discount	1,427,436	1,629,134
Term Loans Prior Period [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Current	46,330	51,554
30-89 Days Past Due	804	1,148
Nonaccrual	6,198	6,148
Loans and leases, net of unearned discount	53,332	58,850
Term Loans Prior Period [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Current	767,710	564,358
30-89 Days Past Due	4,366	8,263
Nonaccrual	9,546	8,783
Loans and leases, net of unearned discount	781,622	581,404
Term Loans Prior Period [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Current	137,122	63,972
30-89 Days Past Due	4,090	3,083
Nonaccrual	6,437	3,805
Loans and leases, net of unearned discount	147,649	70,860
Term Loans Prior Period [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Current	27,345	28,970
30-89 Days Past Due	458	557
Accruing Loans Past Due 90 Days or More	335	374
Nonaccrual	213	501
Loans and leases, net of unearned discount	$ 28,351	$ 30,402

Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 1,636,206	$ 1,384,366	$ 1,736,387	$ 1,051,071
Provision for credit losses	(15,000)	325,000	(40,000)	575,000
Net charge-offs
Charge-offs	(80,369)	(91,397)	(203,294)	(159,101)
Recoveries	34,291	20,267	82,035	38,809
Net (charge-offs) recoveries	(46,078)	(71,130)	(121,259)	(120,292)
Ending balance	1,575,128	1,638,236	1,575,128	1,638,236
Adoption of new accounting standard				132,457
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	328,994	358,092	405,846	366,094
Provision for credit losses	15,100	69,400	(57,318)	135,994
Net charge-offs
Charge-offs	(40,095)	(32,608)	(67,040)	(48,991)
Recoveries	10,853	3,373	33,364	6,634
Net (charge-offs) recoveries	(29,242)	(29,235)	(33,676)	(42,357)
Ending balance	314,852	398,257	314,852	398,257
Adoption of new accounting standard				(61,474)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	716,098	433,689	670,719	322,201
Provision for credit losses	(24,805)	159,090	74,666	247,756
Net charge-offs
Charge-offs	(12,523)	(17,472)	(73,175)	(18,744)
Recoveries	1,193	1,014	7,753	1,452
Net (charge-offs) recoveries	(11,330)	(16,458)	(65,422)	(17,292)
Ending balance	679,963	576,321	679,963	576,321
Adoption of new accounting standard				23,656
One-to-Four Family Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	89,789	115,792	103,590	56,033
Provision for credit losses	(12,069)	2,850	(25,504)	12,141
Net charge-offs
Charge-offs	(2,262)	(1,609)	(4,661)	(6,711)
Recoveries	2,411	1,888	4,444	3,562
Net (charge-offs) recoveries	149	279	(217)	(3,149)
Ending balance	77,869	118,921	77,869	118,921
Adoption of new accounting standard				53,896
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	501,325	476,793	556,232	229,118
Provision for credit losses	6,774	93,660	(31,844)	179,109
Net charge-offs
Charge-offs	(25,489)	(39,708)	(58,418)	(84,655)
Recoveries	19,834	13,992	36,474	27,161
Net (charge-offs) recoveries	(5,655)	(25,716)	(21,944)	(57,494)
Ending balance	$ 502,444	$ 544,737	$ 502,444	544,737
Adoption of new accounting standard				194,004
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance				77,625
Net charge-offs
Adoption of new accounting standard				$ (77,625)

Loans and Leases and the Allowance for Credit Losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Jan. 01, 2021	Mar. 31, 2020	Jan. 01, 2020
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	$ 1,001,103	$ 446,591	$ 1,001,103	$ 446,591
Amortized Cost without Allowance	1,240,954	710,059	1,240,954	710,059
Total	2,242,057	1,156,650	2,242,057	1,156,650
Amortized Cost					$ 1,957,106	$ 1,893,299	$ 1,061,748	$ 1,134,333
Interest Income Recognized	11,604	18,127	22,334	30,698
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	210,294	138,556	210,294	138,556
Amortized Cost without Allowance	119,746	146,098	119,746	146,098
Total	330,040	284,654	330,040	284,654
Amortized Cost					295,069	306,827	286,647	346,743
Interest Income Recognized	2,930	1,298	6,015	3,036
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	366,166	57,675	366,166	57,675
Amortized Cost without Allowance	715,380	114,813	715,380	114,813
Total	1,081,546	172,488	1,081,546	172,488
Amortized Cost					824,079	775,894	188,469	173,796
Interest Income Recognized	604	4,697	2,262	5,789
Residential Builder and Developer [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	1,093	1,748	1,093	1,748
Amortized Cost without Allowance	13,459		13,459
Total	14,552	1,748	14,552	1,748
Amortized Cost					1,224	1,094	3,204	4,708
Interest Income Recognized		11	33	59
Other Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	20,717	42,969	20,717	42,969
Amortized Cost without Allowance	113,041	42,457	113,041	42,457
Total	133,758	85,426	133,758	85,426
Amortized Cost					126,225	114,039	34,935	35,881
Interest Income Recognized	274	5,716	315	6,577
Residential [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	191,965	80,772	191,965	80,772
Amortized Cost without Allowance	180,179	226,135	180,179	226,135
Total	372,144	306,907	372,144	306,907
Amortized Cost					385,508	365,729	293,638	322,504
Interest Income Recognized	6,296	5,029	10,794	11,848
Residential Limited Documentation [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	85,683	26,460	85,683	26,460
Amortized Cost without Allowance	51,000	92,235	51,000	92,235
Total	136,683	118,695	136,683	118,695
Amortized Cost					143,069	147,170	119,317	114,667
Interest Income Recognized	157	256	236	457
Home Equity Lines and Loans [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	38,860	38,890	38,860	38,890
Amortized Cost without Allowance	37,851	38,204	37,851	38,204
Total	76,711	77,094	76,711	77,094
Amortized Cost					79,188	79,392	63,071	65,039
Interest Income Recognized	993	760	1,945	2,219
Recreational Finance [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	16,620	16,264	16,620	16,264
Amortized Cost without Allowance	6,656	7,888	6,656	7,888
Total	23,276	24,152	23,276	24,152
Amortized Cost					27,218	25,519	13,405	14,308
Interest Income Recognized	159	154	314	306
Automobile [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	27,609	35,510	27,609	35,510
Amortized Cost without Allowance	3,481	7,226	3,481	7,226
Total	31,090	42,736	31,090	42,736
Amortized Cost					38,219	39,404	19,251	21,293
Interest Income Recognized	48	45	97	92
Other [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	42,096	7,747	42,096	7,747
Amortized Cost without Allowance	161	35,003	161	35,003
Total	42,257	42,750	42,257	42,750
Amortized Cost					$ 37,307	$ 38,231	$ 39,811	$ 35,394
Interest Income Recognized	$ 143	$ 161	$ 323	$ 315

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) Modification	Jun. 30, 2020 USD ($) Modification	Jun. 30, 2021 USD ($) Modification	Jun. 30, 2020 USD ($) Modification
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	492	2,394	1,347	2,490
Pre-modification Recorded Investment	$ 254,305	$ 152,872	$ 385,937	$ 219,374
post modification recorded investment	252,836	143,300	382,797	209,817
Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	54,746	69,139	140,262	82,158
Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment		333		333
Other
Financing Receivable, Modifications [Line Items]
post modification recorded investment	28,578	36,405	30,792	36,405
Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 169,512	$ 37,423	$ 211,743	$ 90,921
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	89	135	182	167
Pre-modification Recorded Investment	$ 70,749	$ 55,136	$ 124,482	$ 67,828
post modification recorded investment	70,448	54,670	123,605	66,723
Commercial, Financial, Leasing, etc. [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	11,439	17,551	36,092	22,617
Commercial, Financial, Leasing, etc. [Member] \| Other
Financing Receivable, Modifications [Line Items]
post modification recorded investment	222	31,605	222	31,605
Commercial, Financial, Leasing, etc. [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 58,787	$ 5,514	$ 87,291	$ 12,501
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	35	46	68	56
Pre-modification Recorded Investment	$ 143,141	$ 41,872	$ 170,011	$ 81,514
post modification recorded investment	142,161	31,992	167,957	69,315
Commercial Real Estate [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	7,370	10,511	18,530	11,866
Commercial Real Estate [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment		333		333
Commercial Real Estate [Member] \| Other
Financing Receivable, Modifications [Line Items]
post modification recorded investment	28,356	4,800	30,570	4,800
Commercial Real Estate [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 106,435	$ 16,348	$ 118,857	$ 52,316
Residential Builder and Developer [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification		1		1
Pre-modification Recorded Investment		$ 91		$ 91
post modification recorded investment		90		90
Residential Builder and Developer [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment		$ 90		$ 90
Other Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	3		3
Pre-modification Recorded Investment	$ 542		$ 542
post modification recorded investment	532		532
Other Commercial Construction [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 532		$ 532
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	117	25	240	52
Pre-modification Recorded Investment	$ 34,041	$ 8,872	$ 73,624	$ 19,050
post modification recorded investment	33,863	9,634	73,537	21,858
Residential [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	29,573	3,101	68,130	6,348
Residential [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 4,290	$ 6,533	$ 5,407	$ 15,510
Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	16	120	42	126
Pre-modification Recorded Investment	$ 1,970	$ 7,571	$ 3,685	$ 8,309
post modification recorded investment	1,970	7,584	3,630	8,330
Home Equity Lines and Loans [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 1,970	147	3,456	559
Home Equity Lines and Loans [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment		$ 7,437	$ 174	$ 7,771
Recreational Finance [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	34	271	106	274
Pre-modification Recorded Investment	$ 1,119	$ 10,795	$ 3,331	$ 10,885
post modification recorded investment	1,119	10,795	3,331	10,885
Recreational Finance [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 1,119	$ 10,795	$ 3,331	$ 10,885
Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	94	1,461	370	1,470
Pre-modification Recorded Investment	$ 1,502	$ 26,352	$ 6,471	$ 26,534
post modification recorded investment	1,502	26,352	6,471	26,534
Automobile [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 1,502	$ 26,352	6,457	$ 26,534
Automobile [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment			$ 14
Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	101		323
Pre-modification Recorded Investment	$ 836		$ 2,270
post modification recorded investment	836		2,270
Other [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 836		$ 2,270
Other
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification		335		335
Pre-modification Recorded Investment		$ 2,183		$ 2,183
post modification recorded investment		2,183		2,183
Other \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment		682		682
Other \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment		$ 1,501		$ 1,501
Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	3		13	9
Pre-modification Recorded Investment	$ 405		$ 1,521	$ 2,980
post modification recorded investment	405		1,464	3,899
Residential Limited Documentation [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment	$ 405		$ 1,464	2,667
Residential Limited Documentation [Member] \| Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
post modification recorded investment				$ 1,232

Borrowings - Additional Information (Detail) - USD ($) $ in Millions		6 Months Ended
	Mar. 01, 2021	Jun. 30, 2021	Jan. 25, 2021
Debt Instrument [Line Items]
Junior subordinated debentures		$ 530
Debt Maturity, Start Year		Jan. 01, 2027
Debt Maturity, End Year		Dec. 31, 2033
M&T Bank Corporation [Member]
Debt Instrument [Line Items]
Variable rates senior notes amount			$ 350
Redeemed subordinated notes	$ 500
Maturity Date	Dec. 01, 2021

Revenue from Contracts with Customers - Additional Information (Detail1)	Jun. 30, 2021
Maximum [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Disaggregation Of Revenue [Line Items]
Period of satisfaction of contract with customer	1 year

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Uncollected amounts receivable	$ 62	$ 67
Accrued interest and other liabilities [Member]
Disaggregation Of Revenue [Line Items]
Deferred revenue	$ 38	$ 42

Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Noted Accounting Guidance (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Brokerage services income	$ 10,265	$ 10,463	$ 23,378	$ 23,592
Other revenues from operations:
Total other income	513,633	487,273	1,019,231	1,016,633
Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	98,518	77,455	191,295	183,616
Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	162,991	151,882	319,013	300,633
ASU 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	10,265	10,463	23,378	23,592
Other revenues from operations:
Merchant discount and credit card fees	34,102	21,055	58,465	48,222
Other	20,011	15,764	42,921	39,070
Total other income	325,887	276,619	635,072	595,133
ASU 2014-09 [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	98,518	77,455	191,295	183,616
ASU 2014-09 [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	162,991	151,882	319,013	300,633
ASU 2014-09 [Member] \| Business Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	13,713	8,159	23,194	18,490
Total other income	26,655	19,436	48,633	45,029
ASU 2014-09 [Member] \| Business Banking [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	12,942	11,271	25,439	26,521
ASU 2014-09 [Member] \| Business Banking [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer		6		18
ASU 2014-09 [Member] \| Commercial Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	14,435	8,891	24,842	22,207
Other	1,053	787	2,011	2,973
Total other income	40,443	32,329	76,103	72,292
ASU 2014-09 [Member] \| Commercial Banking [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	24,955	22,514	49,250	46,671
ASU 2014-09 [Member] \| Commercial Banking [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer		137		441
ASU 2014-09 [Member] \| Commercial Real Estate [Member]
Other revenues from operations:
Merchant discount and credit card fees	500	379	945	1,228
Other	1,926	1,188	3,017	2,031
Total other income	5,324	4,132	9,753	8,636
ASU 2014-09 [Member] \| Commercial Real Estate [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	2,898	2,565	5,791	5,377
ASU 2014-09 [Member] \| Discretionary Portfolio [Member]
Other revenues from operations:
Other	376	150	760	1,007
Total other income	376	150	760	1,007
ASU 2014-09 [Member] \| Residential Mortgage Banking [Member]
Other revenues from operations:
Other	1,447	1,052	3,169	1,974
Total other income	1,447	1,052	3,169	1,974
ASU 2014-09 [Member] \| Retail Banking [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	20		20
Other revenues from operations:
Merchant discount and credit card fees	5,908	3,450	9,829	5,721
Other	6,012	3,166	11,819	9,148
Total other income	68,526	46,640	129,706	116,563
ASU 2014-09 [Member] \| Retail Banking [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	56,586	40,024	108,038	101,694
ASU 2014-09 [Member] \| All Other [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	10,245	10,463	23,358	23,592
Other revenues from operations:
Merchant discount and credit card fees	(454)	176	(345)	576
Other	9,197	9,421	22,145	21,937
Total other income	183,116	172,880	366,948	349,632
ASU 2014-09 [Member] \| All Other [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1,137	1,081	2,777	3,353
ASU 2014-09 [Member] \| All Other [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 162,991	$ 151,739	$ 319,013	$ 300,174

Pension Plans and Other Postretirement Benefits - Net Periodic Defined Benefit Cost for Defined Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,234	$ 5,258	$ 10,257	$ 9,972
Interest cost on projected benefit obligation	15,502	17,824	30,936	35,710
Expected return on plan assets	(35,774)	(31,281)	(71,724)	(62,756)
Amortization of prior service cost (credit)	151	154	276	279
Amortization of net actuarial loss (gain)	22,359	15,098	44,509	29,048
Net periodic cost (benefit)	7,472	7,053	14,254	12,253
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	258	262	506	485
Interest cost on projected benefit obligation	329	451	656	870
Amortization of prior service cost (credit)	(1,194)	(1,194)	(2,369)	(2,369)
Amortization of net actuarial loss (gain)	(347)	(318)	(647)	(618)
Net periodic cost (benefit)	$ (954)	$ (799)	$ (1,854)	$ (1,632)

Pension Plans and Other Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Compensation And Retirement Disclosure [Abstract]
Defined contribution pension and retirement savings plans total expense	$ 25	$ 23	$ 58	$ 51

Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income available to common shareholders:
Net income	$ 458,069	$ 241,054	$ 905,318	$ 509,876
Less: Preferred stock dividends	(17,050)	(17,050)	(34,100)	(34,128)
Net income available to common equity	441,019	224,004	871,218	475,748
Less: Income attributable to unvested stock-based compensation awards	(2,263)	(906)	(4,370)	(1,954)
Net income available to common shareholders	$ 438,756	$ 223,098	$ 866,848	$ 473,794
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	129,589	129,059	129,502	129,750
Less: Unvested stock-based compensation awards	(918)	(784)	(898)	(764)
Weighted-average shares outstanding	128,671	128,275	128,604	128,986
Basic earnings per common share	$ 3.41	$ 1.74	$ 6.74	$ 3.67

Earnings Per Common Share - Computations of Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income available to common equity	$ 441,019	$ 224,004	$ 871,218	$ 475,748
Less: Income attributable to unvested stock-based compensation awards	(2,260)	(905)	(4,366)	(1,953)
Net income available to common shareholders	$ 438,759	$ 223,099	$ 866,852	$ 473,795
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards	129,589	129,059	129,502	129,750
Less: Unvested stock-based compensation awards	(918)	(784)	(898)	(764)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock	171	58	152	58
Adjusted weighted-average shares outstanding	128,842	128,333	128,756	129,044
Diluted earnings per common share	$ 3.41	$ 1.74	$ 6.73	$ 3.67

Earnings Per Common Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	462,342	483,491	462,342	474,093

Comprehensive Income - Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			$ (85,143)	$ (279,959)
Unrealized holding gains (losses), net, before tax			(43,732)	177,086
Foreign currency translation adjustment, before tax			881	(3,624)
Unrealized gains (losses) on cash flow hedges, before tax			(5,969)	511,195
Total other comprehensive income (loss) before reclassifications			(48,820)	684,657
Amortization of unrealized holding losses on held-to-maturity ("HTM") securities, before tax			2,232	1,619
Gains (Loss) realized in net income			(4)
Accretion of net gain (losses) on terminated cash flow hedges, before tax			(60)	(64)
Net yield adjustment from cash flow hedges currently in effect, before tax			(148,655)	(101,194)
Amortization of prior service credit, before tax			(2,093)	(2,090)
Amortization of actuarial losses, before tax			43,862	28,430
Total other comprehensive income (loss), before tax			(153,538)	611,358
Ending balance, before tax	$ (238,681)	$ 331,399	(238,681)	331,399
Beginning balance, tax			22,111	73,279
Unrealized holding gains (losses), net, tax			11,596	(45,856)
Foreign currency translation adjustment, tax			(188)	630
Unrealized losses on cash flow hedges, tax			1,565	(132,404)
Total other comprehensive income (loss) before reclassifications			12,973	(177,630)
Amortization of unrealized holding losses on held-to-maturity ('HTM') securities, tax			(587)	(450)
Gains realized in net income, tax			1
Accretion of net gain on terminated cash flow hedges, tax			17	18
Net yield adjustment from cash flow hedges currently in effect, tax			38,965	26,210
Amortization of prior service credit, tax			590	650
Amortization of actuarial losses, tax			(12,363)	(8,846)
Total other comprehensive income (loss), tax			39,596	(160,048)
Ending balance, tax	61,707	(86,769)	61,707	(86,769)
Beginning balance, net of tax			(63,032)	(206,680)
Unrealized holding gains (losses), net of tax			(32,136)	131,230
Foreign currency translation adjustments	145	(51)	693	(2,994)
Unrealized gains (losses) on cash flow hedges, net of tax			(4,404)	378,791
Total other comprehensive income (loss) before reclassifications			(35,847)	507,027
Amortization of unrealized holding losses on held-to-maturity ('HTM') securities, net of tax			1,645	1,169
Gains realized in net income, net of tax			(3)
Accretion of net gain on terminated cash flow hedges, net of tax			(43)	(46)
Net yield adjustment from cash flow hedges currently in effect, net of tax			(109,690)	(74,984)
Amortization of prior service credit, net of tax			(1,503)	(1,440)
Amortization of actuarial losses, net of tax			31,499	19,584
Total other comprehensive income (loss)	(38,496)	34,797	(113,942)	451,310
Ending balance, net of tax	(176,974)	244,630	(176,974)	244,630
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			195,386	50,701
Unrealized holding gains (losses), net, before tax			(43,732)	177,086
Total other comprehensive income (loss) before reclassifications			(43,732)	177,086
Amortization of unrealized holding losses on held-to-maturity ("HTM") securities, before tax			2,232	1,619
Gains (Loss) realized in net income			(4)
Total other comprehensive income (loss), before tax			(41,504)	178,705
Ending balance, before tax	153,882	229,406	153,882	229,406
Total other comprehensive income (loss)			(30,494)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(650,087)	(464,548)
Amortization of prior service credit, before tax			(2,093)	(2,090)
Amortization of actuarial losses, before tax			43,862	28,430
Total other comprehensive income (loss), before tax			41,769	26,340
Ending balance, before tax	(608,318)	(438,208)	(608,318)	(438,208)
Total other comprehensive income (loss)			29,996
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			369,558	133,888
Foreign currency translation adjustment, before tax			881	(3,624)
Unrealized gains (losses) on cash flow hedges, before tax			(5,969)	511,195
Total other comprehensive income (loss) before reclassifications			(5,088)	507,571
Accretion of net gain (losses) on terminated cash flow hedges, before tax			(60)	(64)
Net yield adjustment from cash flow hedges currently in effect, before tax			(148,655)	(101,194)
Total other comprehensive income (loss), before tax			(153,803)	406,313
Ending balance, before tax	$ 215,755	$ 540,201	$ 215,755	$ 540,201

Comprehensive Income - Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 16,446,508	$ 15,815,794	$ 16,187,283	$ 15,716,649
Net gain (loss) during period	(38,496)	34,797	(113,942)	451,310
Ending balance	16,720,304	15,945,105	16,720,304	15,945,105
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			144,602
Net gain (loss) during period			(30,494)
Ending balance	114,108		114,108
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(481,064)
Net gain (loss) during period			29,996
Ending balance	(451,068)		(451,068)
Accumulated Other Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			273,430
Net gain (loss) during period			(113,444)
Ending balance	159,986		159,986
Accumulated Other Comprehensive Income (Loss), Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(138,478)	209,833	(63,032)	(206,680)
Net gain (loss) during period			(113,942)
Ending balance	$ (176,974)	$ 244,630	$ (176,974)	$ 244,630

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

- Definition

+ References + Details

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 33,850,000,000		$ 33,850,000,000		$ 51,050,000,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)			218,000,000
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans	55,000,000		55,000,000		64,000,000
Aggregate fair value of derivative financial instruments in a liability position	72,000,000		72,000,000		114,000,000
Aggregate fair value of derivative financial instruments in asset position	3,000,000		3,000,000
Net fair value of derivative financial instruments in a net asset position	3,000,000		3,000,000
Collateral relating to net asset positions	3,000,000		3,000,000		3,000,000
Counterparties [Member]
Derivative [Line Items]
Post collateral requirements relating to positions	68,000,000		68,000,000		103,000,000
Clearinghouse Credit Facilities [Member]
Derivative [Line Items]
Amount of initial margin posted	154,000,000		154,000,000		135,000,000
Interest Income [Member]
Derivative [Line Items]
Cash flow hedges derivative instruments income	67,000,000	$ 69,000,000	149,000,000	$ 101,000,000
Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Increase decrease in net interest income due to interest rate swap agreements	75,000,000	$ 81,000,000	166,000,000	$ 117,000,000
Interest Rate Swap Agreements [Member] \| Maturity Period 2021 [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)			27,000,000
Interest Rate Swap Agreements [Member] \| Maturity Period 2022 [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)			150,000,000
Interest Rate Swap Agreements [Member] \| Maturity Period 2023 [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)			41,000,000
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	35,300,000,000		35,300,000,000		37,800,000,000
Foreign Currency and Other Option and Futures Contracts [Member]
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 938,000,000		$ 938,000,000		$ 776,000,000,000

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Amount	$ 33,850,000,000	$ 51,050,000,000
Average Maturity (in years)	10 months 24 days	1 year
Estimated Fair Value Gain (Loss)	$ 928,000	$ 1,076,000
Interest Payments On Variable Rate Commercial Real Estate Loans [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 32,200,000,000	$ 49,400,000,000
Average Maturity (in years)	9 months 18 days	10 months 24 days
Weighted-Average Rate, Fixed	1.43%	2.22%
Weighted-Average Rate, Variable	0.09%	0.15%
Estimated Fair Value Gain (Loss)	$ 190,000	$ 425,000
Fixed Rate Long-Term Borrowings [Member] \| Fair Value Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 1,650,000,000	$ 1,650,000,000
Average Maturity (in years)	2 years 9 months 18 days	3 years 3 months 18 days
Weighted-Average Rate, Fixed	2.86%	2.86%
Weighted-Average Rate, Variable	0.73%	0.79%
Estimated Fair Value Gain (Loss)	$ 738,000	$ 651,000

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Parenthetical) (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Amount	$ 33,850,000,000	$ 51,050,000,000
Forward-Starting Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Notional Amount	14,900,000,000	32,100,000,000
Fair Value Hedges [Member]
Derivative [Line Items]
Reduction of estimated fair value losses on hedging instruments	68,900,000	101,500,000
Cash Flow Hedges [Member]
Derivative [Line Items]
Reduction of estimated fair value losses on hedging instruments	$ 217,800,000	$ 372,200,000

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 710,896	$ 1,067,985
Liability Derivatives, Fair Value	115,030	140,485
Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	707,798	1,064,529
Liability Derivatives, Fair Value	112,399	131,135
Fair Value Hedges [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	3,098	3,456
Liability Derivatives, Fair Value	2,631	9,350
Interest Rate Swap Agreements [Member] \| Fair Value Hedges [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	1,745	1,968
Liability Derivatives, Fair Value	817	892
Commitments to Sell Real Estate Loans [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	5,522	2,409
Liability Derivatives, Fair Value	7,532	13,868
Commitments to Sell Real Estate Loans [Member] \| Fair Value Hedges [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	1,353	1,488
Liability Derivatives, Fair Value	1,814	8,458
Mortgage-Related Commitments to Originate Real Estate Loans for Sale [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	39,262	43,599
Liability Derivatives, Fair Value	3,596	365
Interest Rate Contracts [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	653,557	1,008,913
Liability Derivatives, Fair Value	89,542	105,768
Foreign Exchange and Other Option and Futures Contracts [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	9,457	9,608
Liability Derivatives, Fair Value	$ 11,729	$ 11,134

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Offsetting [Abstract]
Reduction in estimated fair value of interest rate contracts in asset position	$ (32.6)	$ (5.6)
Reduction in estimated fair value of interest rate contracts in liability position	$ (503.1)	$ (806.5)

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	$ (1,126)	$ 1,695	$ (2,752)	$ 18,833
Interest Rate Swap Agreements [Member] \| Fixed Rate Long-Term Borrowings [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member] \| Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives in fair value hedging relationships, Derivatives	154	117	(32,504)	88,827
Derivatives in fair value hedging relationships, Hedged item	(78)	(605)	31,820	(88,429)
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	(2,744)	978	(5,978)	13,764
Foreign Exchange and Other Option and Futures Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	$ 1,618	$ 717	$ 3,226	$ 5,069

Derivative Financial Instruments - Information about Hedged Items Included in Consolidated Balance Sheet (Detail) - Term Loans [Member] - Derivatives Designated and Qualifying as Hedging Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount [Member]
Derivatives, Fair Value [Line Items]
Hedged Item	$ 1,718,333	$ 1,750,048
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Derivatives, Fair Value [Line Items]
Hedged Item	$ 69,350	$ 101,326

Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Loss on securitization of assets			$ 0
Other assets for its "investment" in the common securities recognized by the company of various trusts	$ 23,000,000		23,000,000		$ 23,000,000
Total assets of partnerships in which the company invested	150,622,707,000		150,622,707,000		142,601,105,000
Investment in partnership carrying amount	868,000,000		868,000,000		861,000,000
Unfunded commitments includes carrrying amount of its investments	350,000,000		350,000,000		406,000,000
Maximum exposure to loss of investments in real estate partnerships	1,200,000,000		1,200,000,000
Investments amortized to income tax expense	19,000,000	$ 22,000,000	38,000,000	$ 43,000,000
Federal tax credits and other federal tax benefits recognized	22,000,000	$ 26,000,000	43,000,000	$ 52,000,000
Variable Interest Entity Primary Beneficiary [Member]
Total assets of partnerships in which the company invested	$ 2,500,000,000		$ 2,500,000,000		$ 2,300,000,000

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.

+ References + Details

Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	$ 3,959,783	$ 4,822,606
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account assets	49,544	50,060
Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account assets	663,014	1,018,521
Trading account liabilities	101,271	116,902
U.S. Treasury and Federal Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	7,023	9,338
Government Issued or Guaranteed [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	3,820,490	4,683,438
Other Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	132,270	129,814
Fair Value Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account assets	712,558	1,068,581
Investment securities	3,959,783	4,822,606
Equity securities	78,671	92,985
Real estate loans held for sale	884,355	1,054,676
Other assets	47,882	49,464
Total assets	5,683,249	7,088,312
Trading account liabilities	101,271	116,902
Other liabilities	13,759	23,583
Total liabilities	115,030	140,485
Fair Value Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account assets	49,544	50,060
Equity securities	71,917	63,129
Total assets	121,461	113,189
Fair Value Measurements, Recurring [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account assets	663,014	1,018,521
Investment securities	3,959,783	4,822,590
Equity securities	6,754	29,856
Real estate loans held for sale	884,355	1,054,676
Other assets	8,620	5,865
Total assets	5,522,526	6,931,508
Trading account liabilities	101,271	116,902
Other liabilities	10,163	23,218
Total liabilities	111,434	140,120
Fair Value Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities		16
Other assets	39,262	43,599
Total assets	39,262	43,615
Other liabilities	3,596	365
Total liabilities	3,596	365
Fair Value Measurements, Recurring [Member] \| U.S. Treasury and Federal Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	7,023	9,338
Fair Value Measurements, Recurring [Member] \| U.S. Treasury and Federal Agencies [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	7,023	9,338
Fair Value Measurements, Recurring [Member] \| Government Issued or Guaranteed [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	3,820,490	4,683,438
Fair Value Measurements, Recurring [Member] \| Government Issued or Guaranteed [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	3,820,490	4,683,438
Fair Value Measurements, Recurring [Member] \| Privately Issued Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities		16
Fair Value Measurements, Recurring [Member] \| Privately Issued Mortgage-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities		16
Fair Value Measurements, Recurring [Member] \| Other Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	132,270	129,814
Fair Value Measurements, Recurring [Member] \| Other Debt Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment securities	$ 132,270	$ 129,814

Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2021

Jun. 30, 2020

Jun. 30, 2021

Jun. 30, 2020

Other Assets and Other Liabilities [Member]

Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

Beginning Balance

$ 13,757

$ 35,027

$ 43,234

$ 10,740

Total gains realized/unrealized:

Included in earnings

^[1]

52,312

48,732

58,337

92,813

Transfers out of Level 3

^[2]

(30,403)

(43,653)

(65,905)

(63,447)

Ending Balance

35,666

40,106

35,666

40,106

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

^[1]

37,300

33,725

35,492

38,514

Privately Issued [Member]

Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

Beginning Balance

Total gains realized/unrealized:

Settlements

$ (16)

Ending Balance

$ 16

[1]	Reported as mortgage banking revenues in the consolidated statement of income and includes the fair value of commitment issuances and expirations
[2]	Transfers out of Level 3 consist of interest rate locks transferred to closed loans.

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Measurement Input [Extensible List]	us-gaap:MeasurementInputComparabilityAdjustmentMember		us-gaap:MeasurementInputComparabilityAdjustmentMember
Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations			15.00%
Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations			90.00%
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves	$ 46	$ 50	$ 104	$ 50
Significant Unobservable Inputs (Level 3) [Member] \| Residential Mortgage Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Capitalized servicing rights	152		152		$ 159
Capitalized servicing rights, valuation allowance			29		$ 30
Changes in fair value recognized for impairment of capitalized servicing rights		10		20
Valuation Charge Recognized	8		$ (1)
Weighted-average prepayment speeds			15.61%		16.01%
Discounted rate represented weighted-average option-adjusted basis spread point percentage			900.00%		900.00%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	629	248	$ 629	248	$ 652
Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis	10	31	10	31
Fair Value, Measurements, Nonrecurring [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	386	145	386	145	339
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	$ 243	$ 103	$ 243	$ 103	$ 313

Fair Value Measurements - Quantitative Information Related to Significant Unobservable Inputs (Detail) - Fair Value Measurements, Recurring [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Discounted Cash Flows \| Other Assets and Other Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Recurring fair value measurements for certain Level 3 Assets and Liabilities	$ 35,666	$ 43,234
Discounted Cash Flows \| Other Assets and Other Liabilities [Member] \| Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Commitment expirations	0.00%	0.00%
Discounted Cash Flows \| Other Assets and Other Liabilities [Member] \| Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Commitment expirations	91.00%	98.00%
Discounted Cash Flows \| Other Assets and Other Liabilities [Member] \| Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Commitment expirations	16.00%	16.00%
Two Independent Pricing Quotes [Member] \| Privately Issued Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Recurring fair value measurements for certain Level 3 Assets and Liabilities		$ 16

Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financial assets:
Interest-bearing deposits at banks	$ 33,864,824		$ 23,663,810
Investment securities	6,143,177		7,045,697
Loans and leases:
Allowance for credit losses	(1,575,128)	$ (1,636,206)	(1,736,387)	$ (1,638,236)	$ (1,384,366)	$ (1,051,071)
Loans and leases, net	95,538,304		96,799,480
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,155,600)		(3,899,910)
Deposits at Cayman Islands office			(652,104)
Long-term borrowings	(3,499,448)		(4,382,193)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,291,665		1,497,457
Trading account assets	49,544		50,060
Investment securities	71,917		63,129
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	118,803		55,286
Interest-bearing deposits at banks	33,864,824		23,663,810
Trading account assets	663,014		1,018,521
Investment securities	6,073,252		7,005,571
Loans and leases:
Loans and leases, net	4,040,226		4,413,566
Accrued interest receivable	409,745		419,936
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,163,772)		(3,919,367)
Deposits at Cayman Islands office			(652,104)
Short-term borrowings	(91,235)		(59,482)
Long-term borrowings	(3,609,147)		(4,490,433)
Accrued interest payable	(48,677)		(59,916)
Trading account liabilities	(101,271)		(116,902)
Other financial instruments:
Commitments to sell real estate loans	(2,471)		(18,429)
Interest rate swap agreements used for interest rate risk management	928		1,076
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	64,824		70,289
Loans and leases:
Consumer loans	17,541,515		16,554,050
Loans and leases, net	92,318,953		93,266,904
Other financial instruments:
Commitments to originate real estate loans for sale	35,666		43,234
Other credit-related commitments	(131,136)		(133,354)
Commercial Loans And Leases [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	25,174,858		27,220,699
Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	205,591		277,911
Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	36,571,644		36,538,669
Residential Real Estate Loans [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	3,834,635		4,135,655
Residential Real Estate Loans [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	13,030,936		12,953,486
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,410,468		1,552,743
Interest-bearing deposits at banks	33,864,824		23,663,810
Trading account assets	712,558		1,068,581
Investment securities	6,143,177		7,045,697
Loans and leases:
Consumer loans	17,440,415		16,570,421
Allowance for credit losses	(1,575,128)		(1,736,387)
Loans and leases, net	95,538,304		96,799,480
Accrued interest receivable	409,745		419,936
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,155,600)		(3,899,910)
Deposits at Cayman Islands office			(652,104)
Short-term borrowings	(91,235)		(59,482)
Long-term borrowings	(3,499,448)		(4,382,193)
Accrued interest payable	(48,677)		(59,916)
Trading account liabilities	(101,271)		(116,902)
Other financial instruments:
Commitments to originate real estate loans for sale	35,666		43,234
Commitments to sell real estate loans	(2,471)		(18,429)
Other credit-related commitments	(131,136)		(133,354)
Interest rate swap agreements used for interest rate risk management	928		1,076
Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	25,409,291		27,574,564
Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	37,558,775		37,637,889
Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	16,704,951		16,752,993
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,410,468		1,552,743
Interest-bearing deposits at banks	33,864,824		23,663,810
Trading account assets	712,558		1,068,581
Investment securities	6,209,993		7,138,989
Loans and leases:
Consumer loans	17,541,515		16,554,050
Loans and leases, net	96,359,179		97,680,470
Accrued interest receivable	409,745		419,936
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,163,772)		(3,919,367)
Deposits at Cayman Islands office			(652,104)
Short-term borrowings	(91,235)		(59,482)
Long-term borrowings	(3,609,147)		(4,490,433)
Accrued interest payable	(48,677)		(59,916)
Trading account liabilities	(101,271)		(116,902)
Other financial instruments:
Commitments to originate real estate loans for sale	35,666		43,234
Commitments to sell real estate loans	(2,471)		(18,429)
Other credit-related commitments	(131,136)		(133,354)
Interest rate swap agreements used for interest rate risk management	928		1,076
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	25,174,858		27,220,699
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	36,777,235		36,816,580
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	$ 16,865,571		$ 17,089,141

Commitments and Contingencies - Commitments and Contingent Liabilities Outstanding (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Commitments to extend credit
Home equity lines of credit	$ 5,677,025	$ 5,563,854
Commercial real estate loans to be sold	445,249	363,735
Other commercial real estate	6,077,907	7,237,367
Residential real estate loans to be sold	1,022,844	1,026,118
Other residential real estate	942,654	665,259
Commercial and other	21,003,234	19,427,886
Standby letters of credit	2,269,907	2,241,417
Commercial letters of credit	30,893	27,332
Financial guarantees and indemnification contracts	4,199,215	4,220,531
Commitments to sell real estate loans	$ 2,017,837	$ 2,108,823

Commitments and Contingencies - Additional Information (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Commitments to extend credit to commercial customers	$ 10,900,000,000	$ 10,400,000,000
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program	4,000,000,000.0	$ 4,000,000,000.0
Minimum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses	0
Maximum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses	$ 25,000,000

Segment Information - Information about Company's Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net income	$ 458,069	$ 241,054	$ 905,318	$ 509,876
Net Income (Loss)	458,069	241,054	905,318	509,876
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,455,973	1,444,410	2,942,966	2,950,575
Business Banking [Member]
Segment Reporting Information [Line Items]
Net income	41,607	37,563	87,878	70,489
Net Income (Loss)	41,607	37,563	87,878	70,489
Business Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	145,098	138,086	301,001	275,919
Business Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	794	144	1,463	1,029
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net income	111,035	111,030	233,673	254,762
Net Income (Loss)	111,035	111,030	233,673	254,762
Commercial Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	284,659	287,525	570,571	579,301
Commercial Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,012	249	1,821	1,302
Commercial Real Estate [Member]
Segment Reporting Information [Line Items]
Net income	86,690	107,083	157,962	224,491
Net Income (Loss)	86,690	107,083	157,962	224,491
Commercial Real Estate [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	200,559	227,113	401,402	450,418
Commercial Real Estate [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	230	60	452	469
Discretionary Portfolio [Member]
Segment Reporting Information [Line Items]
Net income	78,532	95,691	169,078	121,359
Net Income (Loss)	78,532	95,691	169,078	121,359
Discretionary Portfolio [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	118,307	138,827	252,851	188,046
Discretionary Portfolio [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	(10,079)	(9,861)	(20,106)	(22,898)
Residential Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net income	30,103	37,400	79,714	62,016
Net Income (Loss)	30,103	37,400	79,714	62,016
Residential Mortgage Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	146,682	142,045	300,442	267,606
Residential Mortgage Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	22,875	21,016	45,058	42,433
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net income	89,200	86,498	174,558	196,744
Net Income (Loss)	89,200	86,498	174,558	196,744
Retail Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	350,988	353,521	697,905	756,204
Retail Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	281	267	553	534
All Other [Member]
Segment Reporting Information [Line Items]
Net income	20,902	(234,211)	2,455	(419,985)
Net Income (Loss)	20,902	(234,211)	2,455	(419,985)
All Other [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	209,680	157,293	418,794	433,081
All Other [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	$ (15,113)	$ (11,875)	$ (29,241)	$ (22,869)

Segment Information - Summary of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net income	$ 458,069	$ 241,054	$ 905,318	$ 509,876
Average Total Assets	149,406,000	128,513,000	149,406,000	128,513,000	$ 135,480,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,455,973	1,444,410	2,942,966	2,950,575
Business Banking [Member]
Segment Reporting Information [Line Items]
Net income	41,607	37,563	87,878	70,489
Average Total Assets	8,681,000	7,235,000	8,681,000	7,235,000	8,152,000
Business Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	145,098	138,086	301,001	275,919
Business Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	794	144	1,463	1,029
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net income	111,035	111,030	233,673	254,762
Average Total Assets	29,927,000	30,603,000	29,927,000	30,603,000	30,338,000
Commercial Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	284,659	287,525	570,571	579,301
Commercial Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	1,012	249	1,821	1,302
Commercial Real Estate [Member]
Segment Reporting Information [Line Items]
Net income	86,690	107,083	157,962	224,491
Average Total Assets	25,999,000	25,340,000	25,999,000	25,340,000	25,792,000
Commercial Real Estate [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	200,559	227,113	401,402	450,418
Commercial Real Estate [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	230	60	452	469
Discretionary Portfolio [Member]
Segment Reporting Information [Line Items]
Net income	78,532	95,691	169,078	121,359
Average Total Assets	22,769,000	26,821,000	22,769,000	26,821,000	27,726,000
Discretionary Portfolio [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	118,307	138,827	252,851	188,046
Discretionary Portfolio [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	(10,079)	(9,861)	(20,106)	(22,898)
Residential Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net income	30,103	37,400	79,714	62,016
Average Total Assets	6,638,000	3,113,000	6,638,000	3,113,000	4,038,000
Residential Mortgage Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	146,682	142,045	300,442	267,606
Residential Mortgage Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	22,875	21,016	45,058	42,433
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net income	89,200	86,498	174,558	196,744
Average Total Assets	17,444,000	16,039,000	17,444,000	16,039,000	16,438,000
Retail Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	350,988	353,521	697,905	756,204
Retail Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	281	267	553	534
All Other [Member]
Segment Reporting Information [Line Items]
Net income	20,902	(234,211)	2,455	(419,985)
Average Total Assets	37,948,000	19,362,000	37,948,000	19,362,000	$ 22,996,000
All Other [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	209,680	157,293	418,794	433,081
All Other [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	$ (15,113)	$ (11,875)	$ (29,241)	$ (22,869)

Segment Information - Summary of Segment Information (Parenthetical) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting [Abstract]
Taxable-equivalent adjustment	$ 3,732,000	$ 4,234,000	$ 7,465,000	$ 9,297,000

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 3,499,448,000			$ 3,499,448,000		$ 4,382,193,000
Bayview Lending Group [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of minority interest investment in Bayview Lending Group LLC	$ 0			$ 0
Minority interest in Bayview Lending Group LLC	20.00%			20.00%
Bayview Lending Group [Member] \| Other Revenues From Operations [Member]
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments		$ 0	$ 23,000,000	$ 0
Bayview Lending Group and Bayview Financial [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of mortgage servicing rights	$ 1,800,000,000			1,800,000,000		1,900,000,000
Revenue from contract with customer	2,000,000	2,000,000		4,000,000	$ 5,000,000
Bayview Financial [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of residential mortgage loans from Bayview Financial	72,600,000,000			72,600,000,000		68,100,000,000
Revenues from sub-servicing	37,000,000	$ 34,000,000		71,000,000	$ 71,000,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial	68,000,000			68,000,000		$ 77,000,000
Bayview Financial [Member] \| FHA Guaranteed Mortgage Loans [Member]
Schedule of Equity Method Investments [Line Items]
FHA guaranteed purchase amount of delinquent loan	1,000,000,000.0			1,000,000,000.0
FHA guaranteed mortgage loan	965,000,000			965,000,000
Bayview Financial [Member] \| Syndicated Loan Facility [Member]
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	1,300,000,000			1,300,000,000
Bayview Financial [Member] \| Syndicated Loan Facility [Member] \| M&T Bank [Member]
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 185,000,000			$ 185,000,000

Loans and Leases and the Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Real Estate Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 97,113,432	$ 98,535,867
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,558,294	16,963,561
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,275,200	1,387,378
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	25,409,291	27,574,564
Commercial, Financial, Leasing, etc. [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	23,671,850	25,927,474
Commercial, Financial, Leasing, etc. [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,407,401	1,340,263
Commercial, Financial, Leasing, etc. [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	330,040	306,827
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,842,145	12,063,060
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,188,593	11,352,416
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	522,570	584,751
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	130,982	125,893
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	36,156	42,974
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans Converted to Term Loans [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,191	21,286
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans Converted to Term Loans [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,080	13,970
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans Converted to Term Loans [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,885	7,718
Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27,337,010	27,680,340
Commercial [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21,370,746	23,282,787
Commercial [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,884,718	3,621,659
Commercial [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,081,546	775,894
Commercial [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	918,531	954,022
Commercial [Member] \| Revolving Loans [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	838,766	875,348
Commercial [Member] \| Revolving Loans [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	70,627	44,260
Commercial [Member] \| Revolving Loans [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	9,138	34,414
Residential Builder and Developer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,289,691	1,249,738
Residential Builder and Developer [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,155,612	1,113,915
Residential Builder and Developer [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	119,527	134,729
Residential Builder and Developer [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14,552	1,094
Residential Builder and Developer [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	231,650	240,993
Residential Builder and Developer [Member] \| Revolving Loans [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	227,386	236,943
Residential Builder and Developer [Member] \| Revolving Loans [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,488	4,050
Residential Builder and Developer [Member] \| Revolving Loans [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,776
Other Commercial Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	8,932,074	8,707,811
Other Commercial Construction [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,027,756	7,644,349
Other Commercial Construction [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,770,560	949,423
Other Commercial Construction [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	133,758	114,039
Other Commercial Construction [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	64,133	80,018
Other Commercial Construction [Member] \| Revolving Loans [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	60,473	74,611
Other Commercial Construction [Member] \| Revolving Loans [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,660	5,407
Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,248,858	20,949,019	$ 15,343,248	$ 15,628,942	$ 14,580,702	$ 10,466,749	$ 9,384,634	$ 7,893,838	$ 7,044,703	$ 6,013,013
Term Loans [Member] \| Commercial, Financial, Leasing, etc. [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,483,621	8,128,774	3,896,606	2,388,900	1,997,247	1,675,653	1,398,315	989,229	752,834	779,407
Term Loans [Member] \| Commercial, Financial, Leasing, etc. [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,216,125	7,732,728	3,644,107	2,277,233	1,839,760	1,505,486	1,237,622	930,834	677,218	719,796
Term Loans [Member] \| Commercial, Financial, Leasing, etc. [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	261,644	388,326	229,670	84,358	116,985	113,940	104,301	41,587	54,823	39,930
Term Loans [Member] \| Commercial, Financial, Leasing, etc. [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,852	7,720	22,829	27,309	40,502	56,227	56,392	16,808	20,793	19,681
Term Loans [Member] \| Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,447,014	3,906,363	3,623,027	5,203,887	5,162,043	3,925,746	3,906,267	3,018,239	2,898,157	3,511,628
Term Loans [Member] \| Commercial [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,425,509	3,353,450	2,938,763	4,681,834	4,269,700	3,299,095	2,874,138	2,628,061	2,339,451	2,746,165
Term Loans [Member] \| Commercial [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	13,820	526,037	541,484	400,154	751,325	579,507	977,841	290,885	411,494	568,144
Term Loans [Member] \| Commercial [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,685	26,876	142,780	121,899	141,018	47,144	54,288	99,293	147,212	197,319
Term Loans [Member] \| Residential Builder and Developer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	405,901	509,985	291,111	331,245	261,533	124,289	71,557	18,469	7,674	10,976
Term Loans [Member] \| Residential Builder and Developer [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	404,742	506,295	288,442	223,880	153,198	109,453	56,920	15,048	7,044	10,976
Term Loans [Member] \| Residential Builder and Developer [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,159	3,690	2,669	106,847	107,817	14,836	3,954	3,421	630
Term Loans [Member] \| Residential Builder and Developer [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount				518	518		10,683
Term Loans [Member] \| Other Commercial Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	371,356	1,087,785	1,650,561	3,213,005	3,357,500	2,442,676	2,105,001	1,175,501	789,769	389,889
Term Loans [Member] \| Other Commercial Construction [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	369,948	1,050,258	1,618,519	2,998,921	2,725,119	2,048,063	1,455,655	945,339	359,053	233,127
Term Loans [Member] \| Other Commercial Construction [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,408	37,192	$ 32,042	148,492	555,208	381,091	635,998	225,949	414,394	144,665
Term Loans [Member] \| Other Commercial Construction [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount		335		$ 65,592	$ 77,173	$ 13,522	$ 13,348	$ 4,213	$ 16,322	$ 12,097
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,677,793	19,233,367
Term Loans Prior Period [Member] \| Commercial, Financial, Leasing, etc. [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,002,367	1,506,567
Term Loans Prior Period [Member] \| Commercial, Financial, Leasing, etc. [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,853,234	1,387,695
Term Loans Prior Period [Member] \| Commercial, Financial, Leasing, etc. [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	102,328	73,401
Term Loans Prior Period [Member] \| Commercial, Financial, Leasing, etc. [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	46,805	45,471
Term Loans Prior Period [Member] \| Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	9,381,971	7,160,455
Term Loans Prior Period [Member] \| Commercial [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,684,419	5,698,834
Term Loans Prior Period [Member] \| Commercial [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,118,127	1,212,672
Term Loans Prior Period [Member] \| Commercial [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	579,425	248,949
Term Loans Prior Period [Member] \| Residential Builder and Developer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	20,265	13,781
Term Loans Prior Period [Member] \| Residential Builder and Developer [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	17,880	11,320
Term Loans Prior Period [Member] \| Residential Builder and Developer [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,810	1,885
Term Loans Prior Period [Member] \| Residential Builder and Developer [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	575	576
Term Loans Prior Period [Member] \| Other Commercial Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	593,754	318,937
Term Loans Prior Period [Member] \| Other Commercial Construction [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	438,989	294,030
Term Loans Prior Period [Member] \| Other Commercial Construction [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	131,510	12,034
Term Loans Prior Period [Member] \| Other Commercial Construction [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 23,255	$ 12,873