Associated Banc-Corp (ASB) 10-Q 28 Oct 21 2021 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 25, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-31343
Entity Registrant Name	Associated Banc-Corp
Entity Incorporation, State or Country Code	WI
Entity Address, Address Line One	433 Main Street
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Tax Identification Number	39-1098068
Entity Address, Postal Zip Code	54301
City Area Code	920
Local Phone Number	491-7500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		150,074,324
Entity Central Index Key	0000007789
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	ASB
Security Exchange Name	NYSE
Series E Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.875% Non-Cum. Perp Pref Stock, Srs E
Trading Symbol	ASB PrE
Security Exchange Name	NYSE
Series F Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.625% Non-Cum. Perp Pref Stock, Srs F
Trading Symbol	ASB PrF
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 378,927	$ 416,154
Interest-bearing deposits in other financial institutions	1,281,916	298,759
Federal funds sold and securities purchased under agreements to resell	25,000	1,135
Investment securities AFS, at fair value	3,893,379	3,085,441
Investment securities HTM, net, at amortized cost	1,929,735	1,878,938
Equity securities	17,939	15,106
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	168,281	168,280
Residential loans held for sale	158,202	129,158
Loans	23,621,673	24,451,724
Allowance for loan losses	(290,997)	(383,702)
Loans, net	23,330,676	24,068,022
Tax credit and other investments	301,490	297,232
Premises and equipment, net	383,131	418,914
Bank and corporate owned life insurance	683,610	679,647
Goodwill	1,104,992	1,109,300
Other intangible assets, net	60,296	68,254
Mortgage servicing rights, net	50,329	41,961
Interest receivable	79,011	90,263
Other assets	592,753	653,219
Total assets	34,439,666	33,419,783
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	8,170,105	7,661,728
Interest-bearing deposits	19,681,161	18,820,753
Total deposits	27,851,266	26,482,481
Federal funds purchased and securities sold under agreements to repurchase	267,943	192,971
Commercial paper	54,553	59,346
FHLB advances	1,620,880	1,632,723
Allowance for unfunded commitments	41,276	47,776
Accrued expenses and other liabilities	359,626	364,088
Total liabilities	30,444,705	29,328,850
Stockholders’ Equity
Preferred equity	193,195	353,512
Common stock	1,752	1,752
Surplus	1,711,867	1,720,329
Retained earnings	2,628,421	2,458,920
Accumulated other comprehensive income (loss)	(10,813)	12,618
Treasury stock, at cost	(529,461)	(456,198)
Total common equity	3,801,766	3,737,421
Total stockholders’ equity	3,994,961	4,090,933
Total liabilities and stockholders’ equity	$ 34,439,666	$ 33,419,783
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	200,000	364,458
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Common shares issued	175,216,409	175,216,409
Common shares outstanding	149,961,231	153,540,224
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01
Other long-term funding	$ 1,870,040	$ 2,182,188
Fair Value, Inputs, Level 2
Assets
Investment securities AFS, at fair value	3,769,399	3,058,910
Other long-term funding	$ 249,160	$ 549,465

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income
Interest and fees on loans	$ 174,643	$ 182,625	$ 522,920	$ 599,306
Interest and dividends on investment securities
Taxable	8,745	13,689	24,600	50,064
Tax-exempt	14,613	14,523	43,141	44,021
Other interest	2,281	2,238	5,802	7,774
Total interest income	200,282	213,075	596,462	701,165
Interest expense
Interest on deposits	4,427	10,033	14,945	59,877
Interest on federal funds purchased and securities sold under agreements to repurchase	48	34	103	454
Interest on other short-term funding	8	5	21	46
Interest on PPPLF funding	0	899	0	1,574
Interest on FHLB advances	8,962	14,375	27,979	47,471
Interest on long-term funding	3,163	5,580	14,323	16,780
Total interest expense	16,607	30,925	57,371	126,201
Net interest income	183,675	182,150	539,092	574,964
Provision for credit losses	(24,010)	43,009	(82,018)	157,009
Net interest income after provision for credit losses	207,685	139,141	621,110	417,954
Noninterest income
Noninterest Income In Scope of Topic 606	53,099	49,243	158,383	187,524
Capital markets, net	7,114	7,222	20,928	22,067
Mortgage banking, net	10,657	12,636	42,710	31,043
Bank and corporate owned life insurance	2,760	3,074	8,551	9,793
Asset gains (losses), net(a)	5,228	(339)	10,024	156,945
Investment securities gains (losses), net	0	7	(16)	9,222
Gains on sale of branches, net(b)	0	0	1,038	0
Other	2,116	2,232	8,176	7,321
Total noninterest income	82,076	75,545	250,862	428,342
Noninterest expense
Personnel	107,880	108,567	318,900	334,117
Technology	19,927	19,666	60,902	61,639
Occupancy	15,814	17,854	46,649	48,386
Business development and advertising	6,156	3,626	15,522	13,007
Equipment	5,200	5,399	16,199	16,150
Legal and professional	4,304	5,591	17,495	15,809
Loan and foreclosure costs	1,616	2,118	6,508	8,842
FDIC assessment	5,000	3,900	13,350	14,650
Other intangible amortization	2,203	2,253	6,642	7,939
Loss on prepayments of FHLB advances	0	44,650	0
Other	9,793	13,963	25,547	37,993
Total noninterest expense	177,892	227,587	527,713	603,184
Income (loss) before income taxes	111,870	(12,900)	344,259	243,112
Income tax expense (benefit)	23,060	(58,114)	70,142	3,342
Net income	88,809	45,214	274,117	239,769
Preferred stock dividends	4,155	5,207	14,236	13,152
Net income available to common equity	$ 84,655	$ 40,007	$ 259,880	$ 226,618
Earnings per common share
Basic	$ 0.56	$ 0.26	$ 1.70	$ 1.47
Diluted	$ 0.56	$ 0.26	$ 1.69	$ 1.46
Average common shares outstanding
Basic	150,046	152,440	151,473	153,175
Diluted	151,143	153,194	152,701	153,914
Wealth management fees
Noninterest income
Noninterest Income In Scope of Topic 606	$ 22,110	$ 21,152	$ 67,229	$ 62,884
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606	16,962	14,283	47,366	40,989
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606	11,147	10,207	31,920	28,736
Card-based fees	11,113	10,195	31,838	28,685
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606	2,792	3,487	11,618	9,764
Card-based fees	3,929	4,968	12,769	14,240
Insurance commissions and fees
Noninterest income
Noninterest Income In Scope of Topic 606	88	114	250	45,153
Risk Management and Shared Services
Noninterest expense
Loss on prepayments of FHLB advances			44,650
Risk Management and Shared Services | ABRC
Noninterest income
Gains on sale of branches, net(b)			163,000
Operating Segments | Risk Management and Shared Services
Interest expense
Net interest income	19,047	16,472	49,511	54,662
Provision for credit losses	(43,107)	21,679	(144,717)	99,257
Noninterest income
Total noninterest income	3,077	5,182	12,457	176,646
Noninterest expense
Total noninterest expense	24,478	72,813	64,490	106,610
Income (loss) before income taxes	21,962	(89,005)	83,529	(19,895)
Income tax expense (benefit)	6,129	(72,278)	20,705	(46,817)
Net income	$ 15,833	$ (16,727)	$ 62,824	$ 26,922

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 88,809	$ 45,214	$ 274,117	$ 239,769
Investment securities AFS
Net unrealized gains (losses)	(19,827)	5,840	(35,829)	53,900
Amortization of net unrealized (gains) losses on AFS securities transferred to HTM securities	172	1,296	1,335	2,628
Reclassification adjustment for net losses (gains) realized in net income	0	(7)	16	(9,222)
Income tax (expense) benefit	4,975	(1,786)	8,548	(11,852)
Other comprehensive income (loss) on investment securities AFS	(14,681)	5,342	(25,930)	35,454
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(37)	(36)	(111)	(111)
Amortization of actuarial loss (gain)	1,346	1,313	3,446	2,923
Income tax (expense) benefit	(330)	(703)	(836)	(1,088)
Other comprehensive income (loss) on pension and postretirement obligations	979	573	2,498	1,724
Total other comprehensive income (loss)	(13,702)	5,916	(23,431)	37,178
Comprehensive income	$ 75,107	$ 51,130	$ 250,685	$ 276,948

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period Of Adoption, Adjustment	Performance/Service Based RSAs, RSA,	Board Authorized Purchase Program [Member]	Series C Preferred Stock	Series D Preferred Stock	Series E Preferred Stock	Series F Preferred Stock	Preferred Equity	Preferred EquityCumulative Effect, Period Of Adoption, Adjustment	Common Stock	Common StockCumulative Effect, Period Of Adoption, Adjustment	Surplus	SurplusCumulative Effect, Period Of Adoption, Adjustment	Retained Earnings	Retained EarningsCumulative Effect, Period Of Adoption, Adjustment	Retained EarningsSeries F Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	Treasury StockCumulative Effect, Period Of Adoption, Adjustment	Treasury StockPerformance/Service Based RSAs, RSA,	Treasury StockBoard Authorized Purchase Program [Member]
Beginning balance at Dec. 31, 2019	$ 3,922,124	$ 3,823,787							$ 256,716	$ 256,716	$ 1,752	$ 1,752	$ 1,716,431	$ 1,716,431	$ 2,380,867	$ 2,282,530		$ (33,183)	$ (33,183)	$ (400,460)	$ (400,460)
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019		(98,337)
Comprehensive income
Net income	45,838														45,838
Other comprehensive income (loss)	16,209																	16,209
Comprehensive income	62,046
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,896												(20,659)		0					23,555
Purchase of treasury stock,			$ (5,555)	$ (71,255)																		$ (5,555)	$ (71,255)
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(28,392)														(28,392)
Preferred stock(a)	(3,801)														(3,801)
Stock-based compensation expense, net	10,744												10,744
Ending balance at Mar. 31, 2020	3,790,471								256,716		1,752		1,706,516		2,296,176			(16,974)		(453,714)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					$ 0.3828125	$ 0.3359375	$ 0.3671875
Beginning balance at Dec. 31, 2019	3,922,124	3,823,787							256,716	$ 256,716	1,752	$ 1,752	1,716,431	$ 1,716,431	2,380,867	$ 2,282,530		(33,183)	$ (33,183)	(400,460)	$ (400,460)
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019		$ (98,337)
Comprehensive income
Net income	239,769														239,769
Other comprehensive income (loss)	37,178																	37,178
Comprehensive income	276,948
Cash dividends
Proceeds from issuance of preferred shares	96,921
Ending balance at Sep. 30, 2020	4,045,433								353,637		1,752		1,717,186		2,424,992			3,995		(456,129)
Beginning balance at Mar. 31, 2020	3,790,471								256,716		1,752		1,706,516		2,296,176			(16,974)		(453,714)
Comprehensive income
Net income	148,718														148,718
Other comprehensive income (loss)	15,054																	15,054
Comprehensive income	163,772
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	173												1,523		0					(1,350)
Purchase of treasury stock,			7																			7
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,889)														(27,889)
Preferred stock(a)	(4,144)														(4,144)
Proceeds from issuance of preferred shares	97,129								97,129
Stock-based compensation expense, net	4,939												4,939
Ending balance at Jun. 30, 2020	4,024,457								353,846		1,752		1,712,978		2,412,859			(1,920)		(455,057)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					0.3828125	0.3359375	0.3671875	$ 0.0849931
Net income	45,214														45,214
Other comprehensive income (loss)	5,916																	5,916
Comprehensive income	51,130
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	95												706		0					(610)
Purchase of treasury stock,			(462)																			(462)
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,875)														(27,875)
Preferred stock(a)	(5,207)														(5,207)
Proceeds from issuance of preferred shares	(208)								(208)
Stock-based compensation expense, net	3,502												3,502
Ending balance at Sep. 30, 2020	4,045,433								353,637		1,752		1,717,186		2,424,992			3,995		(456,129)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					0.3828125	0.3359375	0.3671875	0.3515625
Beginning balance at Dec. 31, 2020	4,090,933								353,512		1,752		1,720,329		2,458,920			12,618		(456,198)
Comprehensive income
Net income	94,301														94,301
Other comprehensive income (loss)	(16,811)																	(16,811)
Comprehensive income	77,490
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	10,556												(16,986)							27,542
Purchase of treasury stock,			(3,593)	(17,973)																		(3,593)	(17,973)
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,870)														(27,870)
Preferred stock(a)	(5,207)														(5,207)
Stock-based compensation expense, net	3,444												3,444
Ending balance at Mar. 31, 2021	4,127,780								353,512		1,752		1,706,786		2,520,144			(4,193)		(450,222)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					0.3828125	0.3359375	0.3671875										$ 0.3515625
Beginning balance at Dec. 31, 2020	4,090,933								353,512		1,752		1,720,329		2,458,920			12,618		(456,198)
Comprehensive income
Net income	274,117														274,117
Other comprehensive income (loss)	(23,431)																	(23,431)
Comprehensive income	250,685
Cash dividends
Proceeds from issuance of preferred shares	0
Ending balance at Sep. 30, 2021	3,994,961								193,195		1,752		1,711,867		2,628,421			(10,813)		(529,461)
Beginning balance at Mar. 31, 2021	4,127,780								353,512		1,752		1,706,786		2,520,144			(4,193)		(450,222)
Comprehensive income
Net income	91,007														91,007
Other comprehensive income (loss)	7,082																	7,082
Comprehensive income	98,088
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	7,618												(3,632)							11,250
Purchase of treasury stock,			(856)	(29,972)																		(856)	29,972
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,822)														(27,822)
Preferred stock(a)	(4,875)														(4,875)
Stock-based compensation expense, net	5,092												5,092
Ending balance at Jun. 30, 2021	4,110,052								290,200		1,752		1,708,246		2,576,766			2,889		(469,801)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					$ 0.3197115	0.3359375	0.3671875	0.3515625
Preferred Stock, Redemption Amount	(65,000)								(63,313)						(1,687)
Net income	88,809														88,809
Other comprehensive income (loss)	(13,702)																	(13,702)
Comprehensive income	75,107
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	455												6							449
Purchase of treasury stock,			$ (112)	$ (59,998)																		$ (112)	$ 59,998
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(30,546)														(30,546)
Preferred stock(a)	(4,155)														(4,155)
Stock-based compensation expense, net	3,616												3,616
Ending balance at Sep. 30, 2021	3,994,961								193,195		$ 1,752		$ 1,711,867		2,628,421			$ (10,813)		$ (529,461)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid						$ 0.2842548	$ 0.3671875	$ 0.3515625
Preferred Stock, Redemption Amount	$ (99,458)								$ (97,004)						$ (2,454)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash Flow From Operating Activities
Net income	$ 88,809	$ 94,301	$ 45,214	$ 45,838	$ 274,117	$ 239,769
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Provision for credit losses	(24,010)		43,009		(82,018)	157,009
Depreciation and amortization					36,109	38,707
Addition to (recovery of) valuation allowance on mortgage servicing rights, net					(12,231)	18,481
Amortization of mortgage servicing rights					15,624	16,416
Amortization of other intangible assets	2,203		2,253		6,642	7,939
Amortization and accretion on earning assets, funding, and other, net					12,184	21,748
Net amortization of tax credit investments					25,196	18,988
Losses (gains) on sales of investment securities, net					16	(9,222)
Asset (gains) losses, net					(10,024)	(156,945)
(Gains) losses on sale of branch, net					(1,038)	0
(Gain) loss on mortgage banking activities, net					(32,304)	(43,889)
Mortgage loans originated and acquired for sale					(1,345,158)	(1,319,034)
Proceeds from sales of mortgage loans held for sale					1,348,006	1,620,777
Changes in certain assets and liabilities
(Increase) decrease in interest receivable					11,252	(415)
Increase (decrease) in interest payable					(13,287)	(12,735)
Increase (decrease) in expense payable					24,509	(32,892)
(Increase) decrease in net derivative position					82,122	(133,165)
(Increase) decrease in net income tax position					(19,940)	(58,002)
Net change in other assets and other liabilities					44,366	49,525
Net cash provided by (used in) operating activities					364,141	423,060
Cash Flow From Investing Activities
Net decrease (increase) in loans					804,497	(2,170,320)
Purchases of
AFS securities					(1,985,700)	(1,368,124)
HTM securities					(250,259)	(109,824)
Federal Home Loan Bank and Federal Reserve Bank stocks and equity securities					(9)	(84,152)
Premises, equipment, and software, net of disposals					(34,337)	(34,440)
Other intangibles					0	(200)
Proceeds from
Sales of securities					158,743	626,283
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks					0	144,000
Prepayments, calls, and maturities of AFS investment securities					927,053	893,157
Prepayments, calls, and maturities of HTM investment securities					243,063	323,175
Sales, prepayments, calls, and maturities of other assets					18,149	18,457
Net change in tax credit and alternative investments					(45,655)	(35,630)
Net cash (paid) received in acquisition					0	31,518
Net cash provided by (used in) investing activities					(162,040)	(1,572,625)
Cash Flow From Financing Activities
Net increase (decrease) in deposits					1,400,162	2,495,229
Net decrease in deposits due to branch sales					(31,083)	0
Net increase (decrease) in short-term funding					70,179	(284,655)
Net increase (decrease) in short-term FHLB advances					0	(520,000)
Repayment of long-term FHLB advances					(18,276)	(966,777)
Proceeds from long-term FHLB advances					6,576	4,000
Proceeds from PPPLF					0	1,022,217
(Repayment) proceeds of finance lease principal					(1,056)	(1,044)
Repayments of Senior Debt					(300,000)	0
Proceeds from issuance of preferred shares			(208)		0	96,921
Proceeds from issuance of common stock for stock-based compensation plans					18,629	3,165
Redemption of preferred shares					(164,458)	0
Cash dividends on common stock					(86,238)	(84,156)
Cash dividends on preferred stock					(14,236)	(13,152)
Net cash provided by (used in) financing activities					767,695	1,674,484
Net increase (decrease) in cash and cash equivalents					969,796	524,918
Cash and cash equivalents at beginning of period		716,048		588,744	716,048	588,744	$ 588,744
Cash and cash equivalents at end of period(a)	1,685,843		1,113,663		1,685,843	1,113,663	716,048
Supplemental disclosures of cash flow information
Cash paid for interest					69,470	137,423
Cash paid for (received from) income and franchise taxes					56,262	17,682
Loans and bank premises transferred to OREO					33,794	12,599
Capitalized mortgage servicing rights					11,761	11,495
Loans transferred into held for sale from portfolio, net					10,071	260,856
Unsettled trades to purchase securities					9,855	1,000
Acquisition
Fair value of assets acquired, including cash and cash equivalents	0		457,878		0	457,878
Fair value ascribed to goodwill and intangible assets	0		22,150		0	22,150
Fair value of liabilities assumed	0		480,028		0	480,028
Restricted Cash and Cash Equivalents
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total	1,685,843		1,113,663		1,685,843	1,113,663	$ 716,048
Retained Earnings
Cash Flow From Operating Activities
Net income	$ 88,809	$ 94,301	$ 45,214	$ 45,838	274,117	239,769
ABRC
Proceeds from
Sales, prepayments, calls, and maturities of other assets						256,511
Whitnell
Proceeds from
Sales, prepayments, calls, and maturities of other assets					2,415
Performance/Service Based RSAs, RSA,
Cash Flow From Financing Activities
Payments for Repurchase of Common Stock					(4,562)	(6,010)
Board Authorized Purchase Program [Member]
Cash Flow From Financing Activities
Payments for Repurchase of Common Stock					$ (107,943)	$ (71,255)

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the financial position, results of operations and comprehensive income, changes in stockholders’ equity, and cash flows of the Corporation and Parent Company for the periods presented, and all such adjustments are of a normal recurring nature. The consolidated financial statements include the accounts of all subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the ACLL, goodwill impairment assessment, MSRs valuation, and income taxes. Management has evaluated subsequent events for potential recognition or disclosure. Within the tables presented, certain columns and rows may not sum due to the use of rounded numbers for disclosure purposes.

Acquisitions

Acquisitions	Dec. 11, 2020
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions: The Corporation has not had any acquisitions during the first nine months of 2021. 2020 First Staunton Acquisition On February 14, 2020, the Corporation completed its acquisition of First Staunton. The purchase price was based on an assumed 4% deposit premium at announcement. The conversion of the branches was completed simultaneously with the close of the transaction, expanding the Bank's presence into nine new Metro-East St. Louis communities. As a result of the acquisition and other consolidations, a net of seven branch locations were added. The Corporation recorded $15 million in goodwill related to the First Staunton acquisition. Goodwill created by the acquisition is not tax deductible. The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the First Staunton acquisition: ($ in Thousands) Purchase Accounting Adjustments February 14, 2020 Assets Cash and cash equivalents $ — $ 44,782 Investment securities AFS (24) 98,743 Federal Home Loan Bank and Federal Reserve Bank stocks, at cost — 781 Loans (4,808) 369,741 Premises and equipment, net (3,005) 4,865 Bank owned life insurance 9 6,770 Goodwill 14,812 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 7,379 7,379 OREO (included in other assets on the face of the consolidated balance sheets) 670 762 Other assets 2,795 7,692 Total assets $ 556,328 Liabilities Deposits $ 1,285 $ 438,684 Other borrowings 61 34,613 Accrued expenses and other liabilities 179 6,730 Total liabilities $ 480,028 Total consideration paid $ 76,300 For a description of methods used to determine the fair value of significant assets and liabilities presented on the balance sheet above, see Assumptions section of this Note. The Corporation has purchased loans with the First Staunton acquisition, for which there was, at acquisition, evidence of more than insignificant deterioration of credit quality since origination (PCD). The carrying amount of those loans is as follows: ($ in Thousands) February 14, 2020 Purchase price of loans at acquisition $ 77,221 Allowance for credit losses at acquisition 3,504 Non-credit discount/(premium) at acquisition (951) Par value of acquired loans at acquisition $ 79,774 The Corporation acquired no PCD securities in connection with the acquisition. Assumptions Investment Securities: The fair value of investments on the date of acquisition was determined utilizing an external third party broker opinion of the market value. Loans: Fair values for loans were based on a discounted cash flow methodology that considered factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan, amortization status and current discount rates. For the non-credit (interest and liquidity) premium, loans were grouped together according to similar characteristics when applying various valuation techniques. For the credit discount, loans were also grouped based on whether they had more than insignificant deterioration in credit since origination. CDIs: This intangible asset represents the value of the relationships with deposit customers. The fair value was estimated based on a discounted cash flow methodology that gave appropriate consideration to expected customer attrition rates, net maintenance cost of the deposit base, alternative cost of funds, and the interest costs associated with customer deposits. The CDIs are being amortized on a straight-line basis over 10 years. Time Deposits: The fair value for time deposits are estimated using a discounted cash flow calculation that applies interest rates currently being offered to the contractual interest rates on such time deposits. FHLB Borrowings: The fair value of FHLB advances is estimated based on quoted market prices for the instrument if available, or for similar instruments if not available, or by using discounted cash flow analyses, based on current incremental borrowing rates for similar types of instruments. Dispositions: 2021 On March 1, 2021, the Corporation closed on the sale of its wealth management subsidiary, Whitnell, to Rockefeller for a purchase price of $8 million. Associated reported a first quarter 2021 pre-tax gain of $2 million, included in asset gains (losses), net on the consolidated statements of income, in conjunction with the sale. On February 26, 2021, the Bank completed the sale of one branch located in Monroe, Wisconsin to Summit Credit Union. Under the terms of the transaction, Associated Bank sold $31 million in total deposits and no loans. Associated Bank received an approximately 4% purchase premium on deposits transferred. 2020 On June 30, 2020, the Corporation completed the sale of ABRC to USI for $266 million in cash. Associated recorded a second quarter 2020 pre-tax book gain of $163 million in conjunction with the sale. On December 11, 2020, the Bank completed the sale of five branches in Peoria, Illinois to Morton Community Bank. Under the terms of the transaction, the Bank sold $180 million in total deposits and no loans. Associated Bank received a 4% purchase premium on deposits transferred. With the sale of these branches, the Bank exited the Peoria market.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Summary of Significant Accounting Policies	Note 3 Summary of Significant Accounting Policies The accounting and reporting policies of the Corporation conform to U.S. GAAP and to general practice within the financial services industry. A discussion of these policies can be found in Note 1 Summary of Significant Accounting Policies included in the Corporation’s 2020 Annual Report on Form 10-K. There have been no changes to the Corporation's significant accounting policies since December 31, 2020. New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2019-12 The FASB issued this amendment to simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendment also improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendment was permitted. 1st Quarter 2021 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity. ASU 2020-08 Codification Improvements to Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs The FASB issued this amendment to clarify that an entity should reevaluate whether a callable debt security is within the scope of paragraph 310-20-35-33 for each reporting period. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendments was not permitted. 1st Quarter 2021 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity. Future Accounting Pronouncements There are no applicable material accounting pronouncements recently issued that have not yet been adopted by the Corporation.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Earnings per common share are calculated utilizing the two-class method. Basic earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding. Diluted earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding adjusted for the dilutive effect of common stock awards (outstanding stock options and unvested restricted stock awards). Presented below are the calculations for basic and diluted earnings per common share: Three Months Ended Sep 30, Nine Months Ended Sep 30, (In Thousands, except per share data) 2021 2020 2021 2020 Net income $ 88,809 $ 45,214 $ 274,117 $ 239,769 Preferred stock dividends (4,155) (5,207) (14,236) (13,152) Net income available to common equity $ 84,655 $ 40,007 $ 259,880 $ 226,618 Common shareholder dividends (30,323) (27,676) (85,604) (83,607) Unvested share-based payment awards (222) (199) (634) (549) Undistributed earnings $ 54,109 $ 12,133 $ 173,642 $ 142,462 Undistributed earnings allocated to common shareholders $ 53,716 $ 12,045 $ 172,436 $ 141,426 Undistributed earnings allocated to unvested share-based payment awards 393 87 1,206 1,036 Undistributed earnings $ 54,109 $ 12,133 $ 173,642 $ 142,462 Basic Distributed earnings to common shareholders $ 30,323 $ 27,676 $ 85,604 $ 83,607 Undistributed earnings allocated to common shareholders 53,716 12,045 172,436 141,426 Total common shareholders earnings, basic $ 84,039 $ 39,721 $ 258,040 $ 225,032 Diluted Distributed earnings to common shareholders $ 30,323 $ 27,676 $ 85,604 $ 83,607 Undistributed earnings allocated to common shareholders 53,716 12,045 172,436 141,426 Total common shareholders earnings, diluted $ 84,039 $ 39,721 $ 258,040 $ 225,032 Weighted average common shares outstanding 150,046 152,440 151,473 153,175 Effect of dilutive common stock awards 1,096 754 1,228 739 Diluted weighted average common shares outstanding 151,143 153,194 152,701 153,914 Basic earnings per common share $ 0.56 $ 0.26 $ 1.70 $ 1.47 Diluted earnings per common share $ 0.56 $ 0.26 $ 1.69 $ 1.46 Non-dilutive common stock options of approximately 3 million and 8 million for the three months ended September 30, 2021 and 2020, respectively, and 3 million and 7 million for the nine months ended September 30, 2021 and 2020, respectively, were excluded from the earnings per common share calculation.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Stock-Based Compensation	Stock-Based Compensation The fair values of stock options and restricted stock awards (including restricted stock units) are amortized as compensation expense on a straight-line basis over the vesting period of the grants. For colleagues who meet the definition of retirement eligible under the 2017 Incentive Compensation Plan and the 2020 Incentive Compensation Plan, expenses related to stock options and restricted stock awards are fully recognized on the date the colleague meets the definition of normal or early retirement. Compensation expense recognized is included in personnel expense on the consolidated statements of income. Assumptions are used in estimating the fair value of stock options granted. The weighted average expected life of the stock option represents the period of time stock options are expected to be outstanding and is estimated using historical data of stock option exercises and forfeitures. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is based on the implied volatility of the Corporation’s stock. The Corporation did not grant stock options in the first nine months of 2021. The following assumptions were used in estimating the fair value for options granted for the full year 2020: 2020 Dividend yield 3.50 % Risk-free interest rate 1.60 % Weighted average expected volatility 21.00 % Weighted average expected life 5.75 years Weighted average per share fair value of options $2.39 A summary of the Corporation’s stock option activity for the nine months ended September 30, 2021 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2020 6,473 $ 19.77 6.23 years $ 2,005 Exercised 1,116 16.36 Forfeited or expired 97 22.61 Outstanding at September 30, 2021 5,260 $ 20.44 6.01 years $ 11,044 Options Exercisable at September 30, 2021 3,694 $ 20.58 5.19 years $ 8,062 (a) In thousands Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock option. For the nine months ended September 30, 2021, the intrinsic value of stock options exercised was $6 million compared to less than $1 million for the nine months ended September 30, 2020. For the nine months ended September 30, 2021, the total fair value of stock options vested was $3 million compared to $4 million for the nine months ended September 30, 2020. The Corporation recognized compensation expense for the vesting of stock options of $1 million for the nine months ended September 30, 2021, compared to $3 million for the nine months ended September 30, 2020. Included in compensation expense for 2021 was approximately $65,000 for the accelerated vesting of stock options granted to retirement eligible colleagues. At September 30, 2021, the Corporation had $2 million of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominately through the first quarter of 2024. The Corporation also has issued time-based and performance-based restricted stock awards under the 2017 Incentive Compensation Plan and subsequent 2020 Incentive Compensation Plan. Performance awards are based on performance goals of earnings per share and total shareholder return with vesting ranging from a minimum of 0% to a maximum of 150% of the target award. Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date. The following table summarizes information about the Corporation’s restricted stock awards activity for the nine months ended September 30, 2021: Restricted Stock Awards Shares (a) Weighted Average Outstanding at December 31, 2020 2,293 $ 20.70 Granted 1,212 20.00 Vested 797 21.23 Forfeited 52 22.39 Outstanding at September 30, 2021 2,656 $ 19.86 (a) In thousands The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant's award agreement. Performance-based restricted stock awards granted during 2020 and 2021 will cliff-vest after the three

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of securities AFS and HTM at September 30, 2021 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 124,253 $ 46 $ (319) $ 123,981 Agency securities 15,000 — (2) 14,998 Obligations of state and political subdivisions (municipal securities) 394,310 19,709 — 414,020 Residential mortgage-related securities FNMA / FHLMC 2,377,335 9,216 (9,144) 2,377,408 GNMA 77,199 2,497 — 79,696 Private-label 76,033 — — 76,033 Commercial mortgage-related securities FNMA / FHLMC 357,837 2,230 (6,892) 353,175 GNMA 227,622 3,474 — 231,096 Asset backed securities FFELP 212,378 890 (471) 212,797 SBA 7,182 44 (48) 7,179 Other debt securities 3,000 — (1) 2,999 Total investment securities AFS $ 3,872,150 $ 38,106 $ (16,877) $ 3,893,379 Investment securities HTM U. S. Treasury securities $ 1,000 $ 7 $ — $ 1,007 Obligations of state and political subdivisions (municipal securities) 1,541,443 106,181 (3,996) 1,643,628 Residential mortgage-related securities FNMA / FHLMC 37,318 2,129 — 39,447 GNMA 54,900 2,328 — 57,228 Commercial mortgage-related securities FNMA/FHLMC 170,739 248 (4,002) 166,985 GNMA 124,383 3,202 (22) 127,562 Total investment securities HTM $ 1,929,783 $ 114,095 $ (8,019) $ 2,035,858 The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U. S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943 Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of investment securities AFS and HTM at September 30, 2021, are shown below: AFS HTM ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 7,987 $ 7,996 $ 27,797 $ 27,982 Due after one year through five years 75,545 75,970 39,029 40,265 Due after five years through ten years 415,467 430,634 181,911 189,290 Due after ten years 37,565 41,396 1,293,705 1,387,099 Total debt securities 536,564 555,997 1,542,442 1,644,635 Residential mortgage-related securities FNMA / FHLMC 2,377,335 2,377,408 37,318 39,447 GNMA 77,199 79,696 54,900 57,228 Private-label 76,033 76,033 — — Commercial mortgage-related securities FNMA / FHLMC 357,837 353,175 170,739 166,985 GNMA 227,622 231,096 124,383 127,562 Asset backed securities FFELP 212,378 212,797 — — SBA 7,182 7,179 — — Total investment securities $ 3,872,150 $ 3,893,379 $ 1,929,783 $ 2,035,858 Ratio of fair value to amortized cost 100.5 % 105.5 % On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at September 30, 2021: ($ in Thousands) AAA AA A Not Rated Total U. S. Treasury securities $ 1,000 $ — $ — $ — $ 1,000 Obligations of state and political subdivisions (municipal securities) 683,098 847,641 10,511 194 1,541,443 Residential mortgage-related securities FNMA / FHLMC 37,318 — — — 37,318 GNMA 54,900 — — — 54,900 Commercial mortgage-related securities FNMA / FHLMC 170,739 — — — 170,739 GNMA 124,383 — — — 124,383 Total HTM securities $ 1,071,438 $ 847,641 $ 10,511 $ 194 $ 1,929,783 The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020: ($ in Thousands) AAA AA A Total U. S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,252 860,607 14,041 1,441,900 Residential mortgage-related securities FNMA / FHLMC 54,599 — — 54,599 GNMA 114,553 — — 114,553 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 — — 255,742 Total HTM securities $ 1,004,357 $ 860,607 $ 14,041 $ 1,879,005 Investment securities gains (losses), net includes proceeds from the sale of investment securities as well as any applicable write-ups or write-downs of investment securities. The proceeds from the sale of investment securities for the three and nine months ended September 30, 2021 and 2020, are shown below: Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Gross gains on AFS securities $ — $ 7 $ 421 $ 9,312 Gross (losses) on AFS securities — — (437) (90) Investment securities gains (losses), net $ — $ 7 $ (16) $ 9,222 Proceeds from sales of investment securities $ — $ 8 $ 158,708 $ 626,283 During the second quarter of 2021, the Corporation sold $107 million of lower yielding FFELP student loan asset backed securities at a slight gain and reinvested the proceeds into higher yielding mortgage backed securities. During the first quarter of 2021, the Corporation sold $51 million of lower yielding U.S. Treasury and Agency securities at a slight loss to take advantage of the steeper yield curve by reinvesting the proceeds into similar but higher yielding, longer duration securities. During the second quarter of 2020, the Corporation sold $261 million of less liquid securities at a gain of $3 million, reinvesting the proceeds into more liquid securities in order to further improve portfolio liquidity. During the first quarter of 2020, the Corporation sold $281 million of primarily prepayment sensitive mortgage-related securities at a gain of $6 million. Additionally, in February 2020, the Corporation sold $84 million of certain securities acquired in the First Staunton acquisition that did not fit the parameters of the Corporation's current investment strategy. Investment securities with a carrying value of $2.2 billion and $1.6 billion at September 30, 2021 and December 31, 2020, respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law. Accrued interest receivable on HTM securities totaled $12 million and $14 million at September 30, 2021 and December 31, 2020, respectively. Accrued interest receivable on AFS securities totaled $9 million and $8 million at September 30, 2021 and December 31, 2020, respectively. Accrued interest receivable on both HTM and AFS securities is included in interest receivable on the consolidated balance sheets. There was no interest income reversed for investments going into nonaccrual at both September 30, 2021 and 2020. A security is considered past due once it is 30 days past due under the terms of the agreement. At both September 30, 2021 and December 31, 2020, the Corporation had no past due HTM securities. The allowance for credit losses on HTM securities was approximately $49,000 at September 30, 2021 and approximately $67,000 at December 31, 2020, attributable entirely to the Corporation's municipal securities, included in investment securities HTM, net, at amortized cost on the consolidated balance sheets. The Corporation also holds U.S. Treasury, municipal and mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and, as a result, no allowance for credit losses has been recorded related to these securities. The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2021: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS U.S. Treasury securities 4 $ (319) $ 84,071 — — $ — $ (319) $ 84,071 Agency securities 1 (2) 14,998 — — — (2) 14,998 Residential mortgage-related securities FNMA / FHLMC 33 (9,144) 1,170,981 — — — (9,144) 1,170,981 GNMA 1 — 69 — — — — 69 FNMA / FHLMC commercial mortgage-related securities 19 (6,892) 331,504 — — — (6,892) 331,504 Asset backed securities FFELP 1 (124) 34,876 8 (347) 65,002 (471) 99,878 SBA — — — 9 (48) 4,229 (48) 4,229 Other debt securities 1 (1) 999 — — — (1) 999 Total 60 $ (16,482) $ 1,637,498 17 $ (395) $ 69,231 $ (16,877) $ 1,706,729 Investment securities HTM Obligations of state and political subdivisions (municipal securities) 62 $ (3,996) $ 151,216 — $ — $ — $ (3,996) $ 151,216 Commercial mortgage-related securities FNMA / FHLMC 11 (4,002) 146,248 — — — (4,002) 146,248 GNMA 1 (22) 15,631 — — — (22) 15,631 Total 74 $ (8,019) $ 313,096 — $ — $ — $ (8,019) $ 313,096 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS Residential mortgage-related securities FNMA / FHLMC 7 $ (500) $ 163,002 — $ — $ — $ (500) $ 163,002 GNMA 2 (3) 9,784 — — — (3) 9,784 GNMA commercial mortgage-related securities 1 — 287 — — — — 287 Asset backed securities FFELP 1 (129) 9,267 16 (2,885) 178,681 (3,013) 187,948 SBA 14 (53) 8,379 — — — (53) 8,379 Other debt securities 2 — 2,000 — — — — 2,000 Total 27 $ (685) $ 192,720 16 $ (2,885) $ 178,681 $ (3,570) $ 371,400 Investment securities HTM GNMA residential mortgage-related securities 1 $ — $ 325 — $ — $ — $ — $ 325 Total 1 $ — $ 325 — $ — $ — $ — $ 325 The Corporation reviews the AFS investment securities portfolio on a quarterly basis to monitor its credit exposure. A determination as to whether a security’s decline in fair value is the result of credit risk takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in this impairment analysis include the extent to which the security has been in an unrealized loss position, the change in security rating, financial condition and near-term prospects of the issuer, as well as the security and industry specific economic conditions. Based on the Corporation’s evaluation, management does not believe any unrealized losses at September 30, 2021 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. The U.S. Treasury 3 year and 5 year rates increased by 36 bp and 62 bp, respectively, from December 31, 2020. The Corporation does not intend to sell nor does it believe that it will be required to sell the securities in an unrealized loss position before recovery of their amortized cost basis. FHLB and Federal Reserve Bank stocks: The Corporation is required to maintain Federal Reserve Bank stock and FHLB stock as a member of both the Federal Reserve System and the FHLB, and in amounts as required by these institutions. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other marketable equity securities and their fair value is equal to amortized cost. The Corporation had FHLB stock of $82 million at both September 30, 2021 and December 31, 2020. The Corporation had Federal Reserve Bank stock of $87 million at both September 30, 2021 and December 31, 2020. Accrued interest receivable on FHLB stock totaled approximately $974,000 and $972,000 at September 30, 2021 and December 31, 2020, respectively. There was $327,000 accrued interest receivable on Federal Reserve Bank stock at September 30, 2021 and none at December 31, 2020. Accrued interest receivable on both FHLB stock and Federal Reserve Bank stock is included in interest receivable on the consolidated balance sheets. Equity Securities Equity securities with readily determinable fair values: The Corporation's portfolio of equity securities with readily determinable fair values is primarily comprised of CRA Qualified Investment mutual funds and a money market mutual fund. At September 30, 2021 and December 31, 2020, the Corporation had equity securities with readily determinable fair values of $4 million and $2 million, respectively.

Loans

Loans	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans	Loans The period end loan composition was as follows: ($ in Thousands) Sep 30, 2021 Dec 31, 2020 PPP $ 182,121 $ 767,757 Commercial and industrial 7,927,459 7,701,422 Commercial real estate — owner occupied 879,554 900,912 Commercial and business lending 8,989,133 9,370,091 Commercial real estate — investor 4,296,489 4,342,584 Real estate construction 1,834,871 1,840,417 Commercial real estate lending 6,131,360 6,183,001 Total commercial 15,120,493 15,553,091 Residential mortgage 7,590,895 7,878,324 Home equity 608,566 707,255 Other consumer 294,979 301,876 Auto 6,739 11,177 Total consumer 8,501,180 8,898,632 Total loans $ 23,621,673 $ 24,451,724 Accrued interest receivable on loans totaled $57 million at September 30, 2021, and $66 million at December 31, 2020, and is included in interest receivable on the consolidated balance sheets. Interest accrued but not received for loans placed on nonaccrual is reversed against interest income. The amount of accrued interest reversed totaled approximately $91,000 and $329,000 for the three and nine months ended September 30, 2021, respectively, and $1 million and $2 million for the three and nine months ended September 30, 2020, respectively. The following table presents commercial and consumer loans by credit quality indicator by vintage year at September 30, 2021: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 147,568 $ 29,900 $ — $ — $ — $ — $ 177,467 Special Mention — — 212 281 — — — — 493 Potential Problem — — 4,160 — — — — — 4,160 PPP $ — $ — $ 151,940 $ 30,180 $ — $ — $ — $ — $ 182,121 Commercial and industrial: Risk rating: Pass $ 2,085 $ 2,278,181 $ 1,664,130 $ 1,046,760 $ 1,092,662 $ 802,214 $ 249,129 $ 621,500 $ 7,754,575 Special Mention — 1,396 5,900 193 28,918 — — 2,990 39,397 Potential Problem 2,825 27,948 1,933 5,555 46,997 21,286 20,111 1,160 124,990 Nonaccrual — — 17 166 108 7,248 — 959 8,497 Commercial and industrial $ 4,910 $ 2,307,525 $ 1,671,979 $ 1,052,674 $ 1,168,685 $ 830,748 $ 269,240 $ 626,609 $ 7,927,459 Commercial real estate - owner occupied: Risk rating: Pass $ 11,667 $ 22,430 $ 143,911 $ 173,396 $ 193,463 $ 114,618 $ 61,713 $ 133,641 $ 843,173 Special Mention — 211 — 3,303 11,368 — — 250 15,132 Potential Problem — 487 6,182 5,969 686 748 2,640 4,529 21,241 Nonaccrual — — — — — — — 7 7 Commercial real estate - owner occupied $ 11,667 $ 23,127 $ 150,094 $ 182,668 $ 205,518 $ 115,366 $ 64,353 $ 138,427 $ 879,554 Commercial and business lending: Risk rating: Pass $ 13,752 $ 2,300,611 $ 1,955,609 $ 1,250,056 $ 1,286,125 $ 916,832 $ 310,842 $ 755,141 $ 8,775,216 Special Mention — 1,606 6,112 3,777 40,287 — — 3,240 55,022 Potential Problem 2,825 28,435 12,275 11,524 47,683 22,034 22,751 5,688 150,391 Nonaccrual — — 17 166 108 7,248 — 966 8,504 Commercial and business lending $ 16,577 $ 2,330,652 $ 1,974,013 $ 1,265,523 $ 1,374,203 $ 946,114 $ 333,593 $ 765,036 $ 8,989,133 Commercial real estate - investor: Risk rating: Pass $ 38,041 $ 85,353 $ 878,373 $ 957,478 $ 1,034,119 $ 474,770 $ 178,270 $ 335,168 $ 3,943,532 Special Mention — — 57,100 67,285 74,040 5,973 1,259 6,836 212,491 Potential Problem — — 5,474 25,720 4,074 24,259 4,730 14,705 78,962 Nonaccrual — — 23,973 8,412 9,690 19,222 — 207 61,504 Commercial real estate - investor $ 38,041 $ 85,353 $ 964,920 $ 1,058,894 $ 1,121,923 $ 524,225 $ 184,259 $ 356,916 $ 4,296,489 Real estate construction: Risk rating: Pass $ — $ 26,560 $ 581,257 $ 731,505 $ 328,020 $ 93,893 $ 21,154 $ 13,227 $ 1,795,616 Special Mention — — — — 3,894 15,885 41 — 19,820 Potential Problem — — 8 124 18,968 — — 87 19,187 Nonaccrual — — — 5 — — — 242 247 Real estate construction $ — $ 26,560 $ 581,265 $ 731,634 $ 350,881 $ 109,778 $ 21,195 $ 13,556 $ 1,834,871 Commercial real estate lending: Risk rating: Pass $ 38,041 $ 111,913 $ 1,459,630 $ 1,688,983 $ 1,362,139 $ 568,663 $ 199,424 $ 348,395 $ 5,739,148 Special Mention — — 57,100 67,285 77,934 21,858 1,300 6,836 232,312 Potential Problem — — 5,483 25,844 23,041 24,259 4,730 14,792 98,150 Nonaccrual — — 23,973 8,417 9,690 19,222 — 448 61,751 Commercial real estate lending $ 38,041 $ 111,913 $ 1,546,185 $ 1,790,529 $ 1,472,804 $ 634,002 $ 205,454 $ 370,472 $ 6,131,360 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total Total commercial: Risk rating: Pass $ 51,793 $ 2,412,524 $ 3,415,239 $ 2,939,040 $ 2,648,264 $ 1,485,495 $ 510,266 $ 1,103,537 $ 14,514,363 Special Mention — 1,606 63,212 71,061 118,220 21,858 1,300 10,076 287,333 Potential Problem 2,825 28,435 17,758 37,367 70,725 46,294 27,481 20,481 248,541 Nonaccrual — — 23,989 8,584 9,798 26,470 — 1,415 70,256 Total commercial $ 54,618 $ 2,442,565 $ 3,520,198 $ 3,056,052 $ 2,847,007 $ 1,580,116 $ 539,047 $ 1,135,508 $ 15,120,493 Residential mortgage: Risk rating: Pass $ — $ — $ 1,404,558 $ 2,040,914 $ 1,048,656 $ 460,120 $ 722,589 $ 1,854,629 $ 7,531,466 Special Mention — — — — — — — 377 377 Potential Problem — — 538 340 409 326 82 679 2,374 Nonaccrual — — 1,721 2,032 4,483 4,979 7,304 36,160 56,678 Residential mortgage $ — $ — $ 1,406,816 $ 2,043,286 $ 1,053,548 $ 465,425 $ 729,974 $ 1,891,844 $ 7,590,895 Home equity: Risk rating: Pass $ 4,992 $ 504,747 $ 773 $ 1,617 $ 8,850 $ 9,952 $ 8,538 $ 65,577 $ 600,053 Special Mention 74 17 — — 1 110 — 375 503 Potential Problem 10 — 10 — — 15 — 146 171 Nonaccrual 582 4 56 25 227 288 303 6,936 7,838 Home equity $ 5,658 $ 504,767 $ 839 $ 1,643 $ 9,078 $ 10,364 $ 8,841 $ 73,034 $ 608,566 Other consumer: Risk rating: Pass $ 402 $ 168,534 $ 7,455 $ 6,730 $ 6,232 $ 1,940 $ 815 $ 109,253 $ 300,959 Special Mention 64 387 — — 13 66 — 4 470 Nonaccrual 4 164 — 12 56 20 20 18 290 Other consumer $ 471 $ 169,084 $ 7,455 $ 6,743 $ 6,300 $ 2,026 $ 835 $ 109,275 $ 301,718 Total consumer: Risk rating: Pass $ 5,394 $ 673,281 $ 1,412,786 $ 2,049,262 $ 1,063,738 $ 472,012 $ 731,942 $ 2,029,458 $ 8,432,478 Special Mention 138 403 — — 14 176 — 756 1,350 Potential Problem 10 — 548 340 409 341 82 825 2,546 Nonaccrual 586 167 1,776 2,070 4,765 5,287 7,627 43,114 64,806 Total consumer $ 6,128 $ 673,852 $ 1,415,110 $ 2,051,672 $ 1,068,927 $ 477,816 $ 739,650 $ 2,074,153 $ 8,501,180 Total loans: Risk rating: Pass (c) $ 57,187 $ 3,085,805 $ 4,828,025 $ 4,988,301 $ 3,712,002 $ 1,957,507 $ 1,242,208 $ 3,132,995 $ 22,946,842 Special Mention 138 2,010 63,212 71,061 118,234 22,034 1,300 10,832 288,683 Potential Problem 2,836 28,435 18,306 37,707 71,134 46,635 27,563 21,305 251,087 Nonaccrual 586 167 25,766 10,653 14,563 31,756 7,627 44,529 135,062 Total loans $ 60,747 $ 3,116,417 $ 4,935,308 $ 5,107,723 $ 3,915,934 $ 2,057,932 $ 1,278,698 $ 3,209,661 $ 23,621,673 (a) Revolving loans converted to term loans are also reported in their year of origination. (b) The Corporation’s policy is to assign risk ratings at the borrower level. PPP loans are 100% guaranteed by the SBA and therefore the Corporation considers these loans to have a risk profile similar to pass rated loans. (c) Accruing TDRs are included in pass unless otherwise rated as special mention. The following table presents commercial and consumer loans by credit quality indicator by vintage year at December 31, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 745,767 $ — $ — $ — $ — $ — $ 745,767 Special Mention — — 3,988 — — — — — 3,988 Potential Problem — — 18,002 — — — — — 18,002 PPP $ — $ — $ 767,757 $ — $ — $ — $ — $ — $ 767,757 Commercial and industrial: Risk rating: Pass $ 4,628 $ 2,177,138 $ 1,389,260 $ 1,435,519 $ 1,182,302 $ 483,957 $ 305,998 $ 453,734 $ 7,427,908 Special Mention — 10,159 2,719 39,854 37,042 113 215 67 90,169 Potential Problem 2,565 7,237 19,331 28,413 56,580 2,269 6,477 1,179 121,487 Nonaccrual 16,852 — 6,238 5,789 17,014 16,623 8,781 7,414 61,859 Commercial and industrial $ 24,045 $ 2,194,534 $ 1,417,548 $ 1,509,575 $ 1,292,938 $ 502,962 $ 321,471 $ 462,394 $ 7,701,422 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,022 $ 185,861 $ 209,069 $ 128,360 $ 99,546 $ 147,366 $ 79,111 $ 867,335 Special Mention — 113 1,882 3,122 300 658 264 — 6,339 Potential Problem — 3,486 4,104 8,916 — 1,490 4,437 3,747 26,179 Nonaccrual — — — — — 318 — 740 1,058 Commercial real estate - owner occupied $ 1,150 $ 21,621 $ 191,847 $ 221,107 $ 128,660 $ 102,012 $ 152,067 $ 83,598 $ 900,912 Commercial and business lending: Risk rating: Pass $ 5,778 $ 2,195,160 $ 2,320,888 $ 1,644,588 $ 1,310,662 $ 583,503 $ 453,364 $ 532,845 $ 9,041,009 Special Mention — 10,272 8,589 42,976 37,342 771 479 67 100,496 Potential Problem 2,565 10,723 41,437 37,329 56,580 3,759 10,915 4,926 165,668 Nonaccrual 16,852 — 6,238 5,789 17,014 16,941 8,781 8,154 62,917 Commercial and business lending $ 25,195 $ 2,216,154 $ 2,377,152 $ 1,730,682 $ 1,421,598 $ 604,974 $ 473,539 $ 545,992 $ 9,370,091 Commercial real estate - investor: Risk rating: Pass $ 10,971 $ 171,497 $ 1,249,644 $ 976,332 $ 720,237 $ 271,987 $ 341,658 $ 211,360 $ 3,942,714 Special Mention — — 90,235 97,333 12,339 — 21,882 8,465 230,254 Potential Problem — 838 16,343 13,575 30,911 2,279 239 27,209 91,396 Nonaccrual 19,803 — 10,141 53,056 446 14,267 — 309 78,220 Commercial real estate - investor $ 30,774 $ 172,335 $ 1,366,364 $ 1,140,297 $ 763,933 $ 288,533 $ 363,779 $ 247,343 $ 4,342,584 Real estate construction: Risk rating: Pass $ 776 $ 47,880 $ 645,925 $ 738,561 $ 294,910 $ 25,219 $ 2,420 $ 16,768 $ 1,771,682 Special Mention — — 487 494 48,283 42 — 30 49,336 Potential Problem — — 135 — 18,803 — 93 15 19,046 Nonaccrual — — — — — 16 — 338 353 Real estate construction $ 776 $ 47,880 $ 646,547 $ 739,055 $ 361,996 $ 25,277 $ 2,513 $ 17,150 $ 1,840,417 Commercial real estate lending: Risk rating: Pass $ 11,746 $ 219,377 $ 1,895,569 $ 1,714,893 $ 1,015,146 $ 297,205 $ 344,078 $ 228,127 $ 5,714,396 Special Mention — — 90,722 97,827 60,622 42 21,882 8,494 279,590 Potential Problem — 838 16,479 13,575 49,714 2,279 332 27,224 110,442 Nonaccrual 19,803 — 10,141 53,056 446 14,283 — 647 78,573 Commercial real estate lending $ 31,549 $ 220,215 $ 2,012,911 $ 1,879,352 $ 1,125,929 $ 313,810 $ 366,292 $ 264,493 $ 6,183,001 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 17,524 $ 2,414,537 $ 4,216,457 $ 3,359,482 $ 2,325,808 $ 880,708 $ 797,441 $ 760,973 $ 14,755,405 Special Mention — 10,272 99,311 140,803 97,964 813 22,361 8,562 380,086 Potential Problem 2,565 11,561 57,916 50,905 106,295 6,038 11,247 32,150 276,111 Nonaccrual 36,655 — 16,379 58,845 17,460 31,224 8,781 8,801 141,490 Total commercial $ 56,745 $ 2,436,370 $ 4,390,063 $ 3,610,033 $ 2,547,526 $ 918,783 $ 839,831 $ 810,485 $ 15,553,091 Residential mortgage: Risk rating: Pass $ — $ — $ 2,185,240 $ 1,490,589 $ 615,118 $ 998,072 $ 911,797 $ 1,612,971 $ 7,813,788 Special Mention — — — 355 330 102 126 537 1,450 Potential Problem — — 1,200 689 652 — 179 1,028 3,749 Nonaccrual — — 1,478 2,271 5,882 7,116 11,003 31,587 59,337 Residential mortgage $ — $ — $ 2,187,918 $ 1,493,903 $ 621,983 $ 1,005,290 $ 923,105 $ 1,646,124 $ 7,878,324 Home equity: Risk rating: Pass $ 10,224 $ 569,389 $ 2,057 $ 12,968 $ 15,792 $ 11,594 $ 5,803 $ 76,165 $ 693,767 Special Mention 596 631 — 39 14 39 4 804 1,532 Potential Problem — 1,922 — — — — — 146 2,068 Nonaccrual 1,600 100 965 134 410 319 711 7,249 9,888 Home equity $ 12,421 $ 572,041 $ 3,022 $ 13,141 $ 16,216 $ 11,952 $ 6,518 $ 84,364 $ 707,255 Other consumer: Risk rating: Pass $ 70 $ 165,114 $ 9,525 $ 10,309 $ 3,987 $ 1,872 $ 1,185 $ 120,425 $ 312,416 Special Mention 5 438 13 16 11 4 7 8 498 Nonaccrual 5 33 9 49 21 10 — 18 140 Other consumer $ 81 $ 165,585 $ 9,547 $ 10,374 $ 4,019 $ 1,886 $ 1,192 $ 120,451 $ 313,054 Total consumer: Risk rating: Pass $ 10,294 $ 734,502 $ 2,196,822 $ 1,513,865 $ 634,897 $ 1,011,539 $ 918,785 $ 1,809,561 $ 8,819,971 Special Mention 602 1,069 13 410 356 145 137 1,349 3,480 Potential Problem — 1,922 1,200 689 652 — 179 1,174 5,817 Nonaccrual 1,605 133 2,452 2,454 6,313 7,445 11,714 38,854 69,364 Total consumer $ 12,501 $ 737,626 $ 2,200,487 $ 1,517,417 $ 642,218 $ 1,019,128 $ 930,816 $ 1,850,939 $ 8,898,632 Total loans: Risk rating: Pass (c) $ 27,819 $ 3,149,039 $ 6,413,278 $ 4,873,347 $ 2,960,705 $ 1,892,247 $ 1,716,226 $ 2,570,534 $ 23,575,376 Special Mention 602 11,341 99,324 141,213 98,320 958 22,498 9,911 383,566 Potential Problem 2,565 13,483 59,116 51,593 106,947 6,038 11,426 33,324 281,928 Nonaccrual 38,260 133 18,831 61,298 23,773 38,669 20,496 47,655 210,854 Total loans $ 69,246 $ 3,173,996 $ 6,590,550 $ 5,127,451 $ 3,189,745 $ 1,937,912 $ 1,770,647 $ 2,661,424 $ 24,451,724 (a) Revolving loans converted to term loans are also reported in their year of origination. (b) The Corporation’s policy is to assign risk ratings at the borrower level. PPP loans are 100% guaranteed by the SBA and therefore the Corporation considers these loans to have a risk profile similar to pass rated loans. (c) Accruing TDRs are included in pass unless otherwise rated as special mention. Factors that are important to managing overall credit quality are sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, and appropriate policies for allowance for loan losses, allowance for unfunded commitments, nonaccrual loans, and charge offs. For commercial loans, management has determined the pass credit quality indicator to include credits exhibiting acceptable financial statements, cash flow, and leverage. If any risk exists, it is mitigated by the loan structure, collateral, monitoring, or control. For consumer loans, performing loans include credits performing in accordance with the original contractual terms. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Special mention credits have potential weaknesses that warrant specific attention from management. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Potential problem loans are considered inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged. These loans generally have a well-defined weakness, or weaknesses, which may jeopardize liquidation of the debt, and are characterized by the distinct possibility the Corporation will sustain some loss if the deficiencies are not corrected. Management has determined commercial loan relationships in nonaccrual status, and commercial and consumer loan relationships with their terms restructured in a TDR, meet the criteria to be individually evaluated. Commercial loans classified as special mention, potential problem, and nonaccrual are reviewed at a minimum on a quarterly basis, while pass credits, which are performing rated credits, are generally reviewed on an annual basis or more frequently if the loan renewal is less than one year or if otherwise warranted. The following table presents loans by past due status at September 30, 2021: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 181,552 $ 485 $ 83 $ — $ — $ 182,121 Commercial and industrial 7,917,635 1,121 108 98 8,497 7,927,459 Commercial real estate - owner occupied 879,516 30 — — 7 879,554 Commercial and business lending 8,978,704 1,636 191 98 8,504 8,989,133 Commercial real estate - investor 4,217,965 17,021 — — 61,504 4,296,489 Real estate construction 1,834,623 — — — 247 1,834,871 Commercial real estate lending 6,052,588 17,021 — — 61,751 6,131,360 Total commercial 15,031,292 18,657 191 98 70,256 15,120,493 Residential mortgage 7,526,996 6,996 99 126 56,678 7,590,895 Home equity 597,776 2,428 503 21 7,838 608,566 Other consumer 292,700 724 549 785 222 294,979 Auto 6,662 10 — — 67 6,739 Total consumer 8,424,134 10,158 1,150 932 64,806 8,501,180 Total loans $ 23,455,426 $ 28,815 $ 1,341 $ 1,029 $ 135,062 $ 23,621,673 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $83 million, or 62%, were current with respect to payment at September 30, 2021. (c) No interest income was recognized on nonaccrual loans for the three and nine months ended September 30, 2021. In addition, there were $11 million of nonaccrual loans for which there was no related ACLL at September 30, 2021. The following table presents loans by past due status at December 31, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 767,757 $ — $ — $ — $ — $ 767,757 Commercial and industrial 7,633,269 2,819 3,300 175 61,859 7,701,422 Commercial real estate - owner occupied 899,480 158 215 — 1,058 900,912 Commercial and business lending 9,300,506 2,977 3,516 175 62,917 9,370,091 Commercial real estate - investor 4,251,571 1,024 11,769 — 78,220 4,342,584 Real estate construction 1,839,073 991 — — 353 1,840,417 Commercial real estate lending 6,090,644 2,015 11,769 — 78,573 6,183,001 Total commercial 15,391,150 4,992 15,284 175 141,490 15,553,091 Residential mortgage 7,808,294 8,975 1,410 308 59,337 7,878,324 Home equity 692,565 3,071 1,731 — 9,888 707,255 Other consumer 299,128 998 545 1,115 91 301,876 Auto 11,072 41 15 — 49 11,177 Total consumer 8,811,060 13,085 3,701 1,423 69,364 8,898,632 Total loans $ 24,202,209 $ 18,077 $ 18,985 $ 1,598 $ 210,854 $ 24,451,724 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $128 million, or 61%, were current with respect to payment at December 31, 2020. (c) No interest income was recognized on nonaccrual loans for the year ended December 31, 2020. In addition, there were $28 million of nonaccrual loans for which there was no related ACLL at December 31, 2020. Troubled Debt Restructurings Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The following table presents nonaccrual and performing restructured loans by loan portfolio: Sep 30, 2021 Dec 31, 2020 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 11,067 $ 959 $ 12,713 $ 6,967 Commercial real estate — owner occupied 1,031 — 1,711 — Commercial real estate — investor 13,236 207 26,435 225 Real estate construction 248 107 260 111 Residential mortgage 15,253 13,235 7,825 11,509 Home equity 2,787 718 1,957 1,379 Other consumer 877 — 1,191 — Total restructured loans (b) $ 44,499 $ 15,226 $ 52,092 $ 20,190 (a) Nonaccrual restructured loans have been included within nonaccrual loans. The Corporation had a recorded investment of $14 million in loans modified as TDRs during the nine months ended September 30, 2021, of which $7 million were in accrual status, included in pass or special mention based on their risk rating within the credit quality tables, and $7 million were in nonaccrual within the credit quality tables, pending a sustained period of repayment. Short-term loan modifications made in good faith to help ease the adverse effects of the COVID-19 pandemic are not categorized as TDRs in accordance with the CARES Act. The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance for the nine months ended September 30, 2021 and 2020: Nine months ended Sep 30, 2021 Nine months ended Sep 30, 2020 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 4 $ 638 $ 638 3 $ 1,250 $ 1,324 Commercial real estate — owner occupied — — — 2 453 751 Commercial real estate — investor 4 1,682 1,682 1 530 530 Real estate construction — — — 1 102 102 Residential mortgage 55 10,434 10,460 32 5,789 5,870 Home equity 7 916 963 18 676 702 Total loans modified 70 $ 13,670 $ 13,744 57 $ 8,800 $ 9,280 (a) Represents post-modification outstanding recorded investment. Restructured loan modifications may include payment schedule modifications, interest rate concessions, maturity date extensions, modification of note structure (A/B Note), non-reaffirmed Chapter 7 bankruptcies, principal reduction, or some combination of these concessions. During the nine months ended September 30, 2021, restructured loan modifications of commercial loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of consumer loans primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the nine months ended September 30, 2021. The following table provides the number of loans modified in a TDR during the previous twelve months which subsequently defaulted during the nine months ended September 30, 2021 and 2020, and the recorded investment in these restructured loans as of September 30, 2021 and 2020: Nine months ended Sep 30, 2021 Nine months ended Sep 30, 2020 ($ in Thousands) Number of Recorded Number of Recorded Residential mortgage 2 $ 200 5 $ 1,036 Home equity — — 4 208 Total loans modified 2 $ 200 9 $ 1,244 All loans modified in a TDR are individually evaluated for impairment. The nature and extent of the impairment of restructured loans, including those which have experienced a subsequent payment default, are considered in the determination of an appropriate level of the ACLL. The Corporation analyzes loans for classification as a probable TDR. This analysis includes identifying customers that are showing possible liquidity issues in the near term without reasonable access to alternative sources of capital. At September 30, 2021, the Corporation had $17 million in loans meeting this classification compared to $68 million at December 31, 2020. Of the loans classified as probable TDRs at September 30, 2021, the entire $17 million was related to the oil and gas portfolio. Allowance for Credit Losses on Loans The ACLL is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the ACLL represents management’s estimate of an amount appropriate to provide for expected lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimates of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. A main factor in the determination of the ACLL is the economic forecast. The Corporation utilized Moody's baseline forecast, updated during September 2021, in the allowance model. The forecast is applied over a 2 year reasonable and supportable period with straight-line reversion to the historical losses over the second year of the period. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). See Note 12 for additional information on the change in the allowance for unfunded commitments. The following table presents a summary of the changes in the ACLL by portfolio segment for the nine months ended September 30, 2021: ($ in Thousands) Dec 31, 2020 Charge offs Recoveries Net Charge offs Provision for credit losses Sep 30, 2021 ACLL / Loans Allowance for loan losses PPP $ 531 $ — $ — $ — $ (406) $ 125 Commercial and industrial 142,793 (13,773) 7,415 (6,358) (47,324) 89,111 Commercial real estate — owner occupied 11,274 — 115 115 634 12,022 Commercial and business lending 154,598 (13,773) 7,530 (6,242) (47,096) 101,259 Commercial real estate — investor 93,435 (14,340) 3,046 (11,293) (680) 81,461 Real estate construction 59,193 (5) 74 69 (18,298) 40,965 Commercial real estate lending 152,629 (14,344) 3,120 (11,224) (18,978) 122,426 Total commercial 307,226 (28,117) 10,650 (17,467) (66,074) 223,685 Residential mortgage 42,996 (732) 700 (32) (1,344) 41,620 Home equity 18,849 (600) 2,240 1,640 (6,172) 14,317 Other consumer 14,456 (2,331) 965 (1,366) (1,836) 11,253 Auto 174 (4) 24 20 (74) 120 Total consumer 76,475 (3,667) 3,928 262 (9,426) 67,311 Total loans $ 383,702 $ (31,784) $ 14,579 $ (17,205) $ (75,500) $ 290,997 Allowance for unfunded commitments Commercial and industrial $ 22,311 $ — $ — $ — $ (2,910) $ 19,402 Commercial real estate — owner occupied 266 — — — 43 309 Commercial and business lending 22,577 — — — (2,867) 19,711 Commercial real estate — investor 636 — — — 85 721 Real estate construction 18,887 — — — (3,411) 15,476 Commercial real estate lending 19,523 — — — (3,326) 16,197 Total commercial 42,101 — — — (6,193) 35,908 Home equity 3,118 — — — (87) 3,031 Other consumer 2,557 — — — (220) 2,337 Total consumer 5,675 — — — (307) 5,368 Total loans $ 47,776 $ — $ — $ — $ (6,500) $ 41,276 Allowance for credit losses on loans PPP $ 531 $ — $ — $ — $ (406) $ 125 0.07 % Commercial and industrial 165,105 (13,773) 7,415 (6,358) (50,233) 108,513 1.37 % Commercial real estate — owner occupied 11,539 — 115 115 677 12,331 1.40 % Commercial and business lending 177,175 (13,773) 7,530 (6,242) (49,963) 120,970 1.35 % Commercial real estate — investor 94,071 (14,340) 3,046 (11,293) (595) 82,182 1.91 % Real estate construction 78,080 (5) 74 69 (21,709) 56,441 3.08 % Commercial real estate lending 172,152 (14,344) 3,120 (11,224) (22,304) 138,623 2.26 % Total commercial 349,327 (28,117) 10,650 (17,467) (72,267) 259,593 1.72 % Residential mortgage 42,996 (732) 700 (32) (1,344) 41,620 0.55 % Home equity 21,967 (600) 2,240 1,640 (6,259) 17,348 2.85 % Other consumer 17,013 (2,331) 965 (1,366) (2,056) 13,591 4.61 % Auto 174 (4) 24 20 (74) 120 1.79 % Total consumer 82,150 (3,667) 3,928 262 (9,733) 72,679 0.85 % Total loans $ 431,478 $ (31,784) $ 14,579 $ (17,205) $ (82,000) $ 332,273 1.41 % The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2020: ($ in Thousands) Dec 31, 2019 Cumulative effect of ASU 2016-13 adoption (CECL) Jan 1, 2020 Charge offs Recoveries Net Charge offs Gross up of allowance for PCD loans at acquisition Provision recorded at acquisition Provision for credit losses Dec 31, 2020 ACLL / Loans Allowance for loan losses PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 Commercial and industrial 91,133 52,919 144,052 (80,320) 7,004 (73,316) 293 408 71,355 142,793 Commercial real estate — owner occupied 10,284 (1,851) 8,433 (419) 147 (272) 890 255 1,967 11,274 Commercial and business lending 101,417 51,068 152,485 (80,739) 7,151 (73,588) 1,183 663 73,853 154,598 Commercial real estate — investor 40,514 2,041 42,555 (22,920) 643 (22,277) 753 472 71,933 93,435 Real estate construction 24,915 7,467 32,382 (19) 49 31 435 492 25,854 59,193 Commercial real estate lending 65,428 9,508 74,937 (22,938) 692 (22,246) 1,188 964 97,787 152,629 Total commercial 166,846 60,576 227,422 (103,677) 7,844 (95,834) 2,371 1,627 171,641 307,226 Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 Home equity 10,926 11,649 22,575 (1,719) 1,978 259 422 374 (4,781) 18,849 Other consumer (a) 6,639 7,016 13,655 (4,790) 1,101 (3,689) 61 140 4,462 14,630 Total consumer 34,525 51,880 86,405 (8,376) 3,579 (4,797) 1,134 917 (7,183) 76,475 Total loans $ 201,371 $ 112,457 $ 313,828 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,543 $ 164,457 $ 383,702 Allowance for unfunded commitments Commercial and industrial $ 12,276 $ (3,998) $ 8,278 $ — $ — $ — $ — $ 61 $ 13,972 $ 22,311 Commercial real estate — owner occupied 127 — 127 — — — — 4 135 266 Commercial and business lending 12,403 (3,998) 8,405 — — — — 65 14,108 22,577 Commercial real estate — investor 530 246 776 — — — — 2 (141) 636 Real estate construction 7,532 18,347 25,879 — — — — 45 (7,038) 18,887 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 (7,179) 19,523 Total commercial 20,465 14,595 35,060 — — — — 112 6,929 42,101 Home equity 1,038 2,591 3,629 — — — — 66 (577) 3,118 Other consumer 405 1,504 1,909 — — — — — 649 2,557 Total consumer 1,443 4,095 5,538 — — — — 66 72 5,675 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 7,000 $ 47,776 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 0.07 % Commercial and industrial 103,409 48,921 152,330 (80,320) 7,004 (73,316) 293 469 85,327 165,105 2.14 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 147 (272) 890 259 2,102 11,539 1.28 % Commercial and business lending 113,820 47,070 160,890 (80,739) 7,151 (73,588) 1,183 728 87,961 177,175 1.89 % Commercial real estate — investor 41,044 2,287 43,331 (22,920) 643 (22,277) 753 474 71,792 94,071 2.17 % Real estate construction 32,447 25,814 58,261 (19) 49 31 435 537 18,816 78,080 4.24 % Commercial real estate lending 73,490 28,101 101,591 (22,938) 692 (22,246) 1,188 1,011 90,608 172,152 2.78 % Total commercial 187,311 75,171 262,482 (103,677) 7,844 (95,834) 2,371 1,739 178,569 349,327 2.25 % Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 0.55 % Home equity 11,964 14,240 26,204 (1,719) 1,978 259 422 440 (5,358) 21,967 3.11 % Other consumer (a) 7,044 8,520 15,564 (4,790) 1,101 (3,689) 61 140 5,111 17,187 5.49 % Total consumer 35,968 55,975 91,943 (8,376) 3,579 (4,797) 1,134 983 (7,112) 82,150 0.92 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,722 $ 171,457 $ 431,478 1.76 % (a) Includes auto Loans Acquired in Acquisitions Loans acquired in a business combination after January 1, 2020 are recorded in accordance with ASC Topic 326. See Note 2 for more information on loans acquired in a business combination. After January 1, 2020, acquired loans were segregated into two types: • Non-PCD loans are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not show evidence of credit deterioration since origination. The allowance for loan losses on these loans is recorded through provision for credit losses on the consolidated statements of income at acquisition. • PCD loans are loans demonstrating more than insignificant credit deterioration and are accounted for in accordance with ASC Topic 326-30. Under this guidance, the credit mark on acquired assets grosses up the ACLL and the amortized cost of the loan.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill Goodwill is not amortized but is instead subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Corporation conducted its most recent annual impairment testing in May 2021, utilizing a qualitative assessment. Factors that management considered in this assessment included macroeconomic conditions, industry and market considerations, overall financial performance of the Corporation and each reporting unit (both current and projected), changes in management strategy, and changes in the composition or carrying amount of net assets. In addition, management considered the changes in both the Corporation's common stock price and in the overall bank common stock index (based on the S&P 400 Regional Bank Sub-Industry Index), as well as the Corporation's earnings per common share trend over the past year. Based on these assessments, management concluded that it is more likely than not that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore a step one quantitative analysis was not required. There have been no events since the May 2021 impairment test that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2020 or the first nine months of 2021. At both September 30, 2021 and December 31, 2020, the Corporation had goodwill of $1.1 billion. During the first quarter of 2021, there was a reduction of $4 million of goodwill related to the sale of Whitnell. Other Intangible Assets The Corporation has other intangible assets that are amortized, consisting of CDIs and MSRs. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) Nine months ended Sep 30, 2021 Year Ended Dec 31, 2020 Core deposit intangibles Gross carrying amount at the beginning of period $ 88,109 $ 80,730 Additions during the period — 7,379 Accumulated amortization (27,814) (21,205) Net book value $ 60,296 $ 66,904 Amortization during the period $ 6,608 $ 8,749 Other intangibles Gross carrying amount at the beginning of period $ 2,000 $ 38,970 Additions during the period — 200 Reductions due to sale (1,317) (17,435) Accumulated amortization (683) (20,385) Net book value $ — $ 1,350 Amortization during the period $ 33 $ 1,443 Mortgage Servicing Rights The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. MSRs are amortized in proportion to and over the period of estimated net servicing income and assessed for impairment at each reporting date. The Corporation evaluates its MSRs asset for impairment at minimum on a quarterly basis. Impairment is assessed based on fair value at each reporting date using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). As mortgage interest rates fall, prepayment speeds are usually faster and the value of the MSRs asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the MSRs asset generally increases, requiring less valuation reserve. A valuation allowance is established, through a charge to earnings, to the extent the amortized cost of the MSRs exceeds the estimated fair value by stratification. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the MSRs asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the MSRs asset and valuation allowance, precluding subsequent recoveries. See Note 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 which further discusses fair value measurement relative to the MSRs asset. A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows: ($ in Thousands) Nine months ended Sep 30, 2021 Year Ended Dec 31, 2020 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 59,967 $ 67,607 Additions from acquisition — 1,357 Additions 11,761 13,667 Amortization (15,624) (22,664) Mortgage servicing rights at end of period $ 56,104 $ 59,967 Valuation allowance at beginning of period $ (18,006) $ (302) (Additions) recoveries, net 12,231 (17,704) Valuation allowance at end of period $ (5,775) $ (18,006) Mortgage servicing rights, net $ 50,329 $ 41,961 Fair value of mortgage servicing rights $ 50,373 $ 41,990 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,057,130 $ 7,743,956 Mortgage servicing rights, net to servicing portfolio 0.71 % 0.54 % Mortgage servicing rights expense (a) $ 3,393 $ 40,369 (a) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net on the consolidated statements of income. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of September 30, 2021. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. The following table shows the estimated future amortization expense for amortizing intangible assets: ($ in Thousands) Core Deposit Intangibles Mortgage Servicing Rights Three Months Ending December 31, 2021 $ 2,203 $ 2,945 2022 8,811 10,898 2023 8,811 8,500 2024 8,811 6,795 2025 8,811 5,499 2026 8,811 4,489 Beyond 2026 14,038 16,978 Total Estimated Amortization Expense $ 60,296 $ 56,104

Short and Long-Term Funding

Short and Long-Term Funding	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Short and Long-Term Funding	Short and Long-Term Funding The following table presents the components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year): ($ in Thousands) Sep 30, 2021 Dec 31, 2020 Short-Term Funding Federal funds purchased $ 415 $ 7,070 Securities sold under agreements to repurchase 267,528 185,901 Federal funds purchased and securities sold under agreements to repurchase 267,943 192,971 Commercial paper 54,553 59,346 Total short-term funding $ 322,496 $ 252,317 Long-Term Funding Bank senior notes, at par, due 2021 $ — $ 300,000 Corporation subordinated notes, at par, due 2025 250,000 250,000 Finance leases 72 1,128 Capitalized costs (912) (1,663) FHLB advances 1,620,880 1,632,723 Total long-term funding 1,870,040 2,182,188 Total short and long-term funding $ 2,192,536 $ 2,434,505 Securities Sold Under Agreements to Repurchase The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of September 30, 2021, the Corporation pledged agency mortgage-related securities with a fair value of $364 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of September 30, 2021 and December 31, 2020 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total September 30, 2021 Repurchase agreements Agency mortgage-related securities $ 267,528 $ — $ — $ — $ 267,528 Total $ 267,528 $ — $ — $ — $ 267,528 December 31, 2020 Repurchase agreements Agency mortgage-related securities $ 185,901 $ — $ — $ — $ 185,901 Total $ 185,901 $ — $ — $ — $ 185,901 Long-Term Funding Senior Notes In August 2018, the Bank issued $300 million of senior notes, due August 2021, and callable July 2021. The senior notes had a fixed coupon interest rate of 3.50% and were issued at a discount. The Bank redeemed all of the senior notes on July 13, 2021, the initial redemption date under the terms of the notes. Subordinated Notes In November 2014, the Corporation issued $250 million of 10-year subordinated notes, due January 2025, and callable October 2024. The subordinated notes have a fixed coupon interest rate of 4.25% and were issued at a discount. Finance Leases In connection with the construction of a new branch in Oshkosh, Wisconsin, the Corporation entered into a land lease with the option to purchase the underlying land for a fixed price, which the Corporation now expects to exercise. The finance lease has a fixed interest rate of 1.07%. See Note 18 for additional disclosure regarding the Corporation’s leases.

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities The Corporation is exposed to certain risk arising from both its business operations and economic conditions. The Corporation principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Corporation manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Corporation enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Corporation's derivative financial instruments are used to manage differences in the amount, timing, and duration of the Corporation's known or expected cash receipts and its known or expected cash payments principally related to the Corporation's assets. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. The Corporation is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. To mitigate the counterparty risk, contracts generally contain language outlining collateral pledging requirements for each counterparty. For non-centrally cleared derivatives, collateral must be posted when the market value exceeds certain mutually agreed upon threshold limits. Securities and cash are often pledged as collateral. The Corporation pledged $78 million and $72 million of investment securities as collateral at September 30, 2021, and December 31, 2020, respectively. At September 30, 2021, the Corporation posted $18 million of cash collateral compared to $31 million at December 31, 2020. Federal regulations require the Corporation to clear all LIBOR interest rate swaps through a clearing house, if possible. For derivatives cleared through central clearing houses, the variation margin payments are legally characterized as daily settlements of the derivative rather than collateral. The Corporation's clearing agent for interest rate derivative contracts that are centrally cleared through the Chicago Mercantile Exchange (CME) and the London Clearing House (LCH) settles the variation margin daily. As a result, the variation margin payment and the related derivative instruments are considered a single unit of account for accounting and financial reporting purposes. Depending on the net position, the fair value is reported in other assets or accrued expenses and other liabilities on the consolidated balance sheets. The daily settlement of the derivative exposure does not change or reset the contractual terms of the instrument. Derivatives to Accommodate Customer Needs The Corporation facilitates customer borrowing activity by entering into various derivative contracts which are designated as free standing derivative contracts. Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk, foreign currency, and commodity prices. These derivative contracts are not designated against specific assets and liabilities on the consolidated balance sheets or forecasted transactions and, therefore, do not qualify for hedge accounting treatment. Such derivative contracts are carried at fair value in other assets and accrued expenses and other liabilities on the consolidated balance sheets with changes in the fair value recorded as a component of capital markets, net, and typically include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, and commodity contracts. See Note 11 for additional information and disclosures on balance sheet offsetting. Interest rate-related instruments: The Corporation provides interest rate risk management services to commercial customers, primarily forward interest rate swaps and caps. The Corporation’s market risk from unfavorable movements in interest rates related to these derivative contracts is generally economically hedged by concurrently entering into offsetting derivative contracts. The offsetting derivative contracts have identical notional values, terms, and indices. Foreign currency exchange forwards: The Corporation provides foreign currency exchange services to customers, primarily forward contracts. The Corporation's customers enter into a foreign currency exchange forward with the Corporation as a means for them to mitigate exchange rate risk. The Corporation mitigates its risk by then entering into an offsetting foreign currency exchange derivative contract. Commodity contracts: Commodity contracts are entered into primarily for the benefit of commercial customers seeking to manage their exposure to fluctuating commodity prices. The Corporation mitigates its risk by then entering into an offsetting commodity derivative contract. Mortgage Derivatives Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded in other assets and accrued expenses and other liabilities on the consolidated balance sheets with the changes in fair value recorded as a component of mortgage banking, net on the consolidated statements of income. The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments as of September 30, 2021 and December 31, 2020. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of September 30, 2021 and December 31, 2020. The resulting net derivative asset and liability fair values are included in other assets and accrued expenses and other liabilities, respectively, on the consolidated balance sheets. Sep 30, 2021 Dec 31, 2020 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Not designated as hedging instruments Interest rate-related instruments $ 3,889,911 $ 110,898 $ 3,889,911 $ 24,322 $ 3,639,679 $ 192,518 $ 3,639,679 $ 25,680 Foreign currency exchange forwards 496,215 4,637 483,949 4,454 411,292 4,909 398,890 4,836 Commodity contracts 16,231 6,546 16,307 6,471 87,547 12,486 83,214 11,155 Mortgage banking (a)(b) 253,663 6,159 390,000 — 226,818 9,624 335,500 2,046 Gross derivatives before netting $ 128,240 $ 35,247 $ 219,537 $ 43,716 Less: Legally enforceable master netting agreements 3,302 3,302 1,936 1,936 Less: Cash collateral pledged/received 3,143 18,595 10,879 25,625 Total derivative instruments, after netting $ 121,795 $ 13,351 $ 206,722 $ 16,155 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. The Corporation terminated its $500 million fair value hedge during the fourth quarter of 2019. At September 30, 2021, the amortized cost basis of the closed portfolios which had previously been used in the terminated hedging relationship was $446 million and is included in loans on the consolidated balance sheets. This amount includes $2 million of hedging adjustments on the discontinued hedging relationships. The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2021 and 2020: Location and Amount of Gain or (Loss) Recognized in Income on Three months ended Sep 30, Nine months ended Sep 30, 2021 2020 2021 2020 ($ in Thousands) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Total amounts of income and expense line items presented on the consolidated statements of income in which the effects of the fair value hedge is recorded $ (292) $ — $ (481) $ — $ (1,128) $ — $ (1,345) $ (262) The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (292) — (481) — (1,128) — (1,345) (262) The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2021 and 2020: Consolidated Statements of Income Category of Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ 557 $ 507 $ 2,546 $ (2,648) Foreign currency exchange forwards Capital markets, net (8) 49 109 (31) Commodity contracts Capital markets, net (124) (86) (1,256) 555 Interest rate lock commitments (mortgage) Mortgage banking, net (1,356) (4,948) (4,438) 5,361 Forward commitments (mortgage) Mortgage banking, net (1,402) 1,293 (3,017) 710

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2021
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate-Related Instruments, Commodity Contracts, and Foreign Exchange Forwards (“Interest, Commodity, and Foreign Exchange Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers, commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, and foreign exchange forwards to manage customers' exposure to fluctuating foreign exchange rates. The Corporation mitigates these risks by entering into equal and offsetting agreements with highly rated third-party financial institutions. The Corporation is party to master netting arrangements with its financial institution counterparties that create single net settlements of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest, commodity, and foreign exchange agreements. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. Derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral, in other assets and accrued expenses and other liabilities, on the face of the consolidated balance sheets. See Note 10 for additional information on the Corporation’s derivative and hedging activities. The following table presents the interest rate, commodity, and foreign exchange assets and liabilities subject to an enforceable master netting arrangement. The interest, commodity and foreign exchange agreements the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement and are therefore excluded from this table: Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Received Derivative assets September 30, 2021 $ 6,719 $ (3,302) $ (3,143) $ 273 December 31, 2020 13,441 (1,936) (10,879) 626 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Pledged Derivative liabilities September 30, 2021 $ 23,489 $ (3,302) $ (18,595) $ 1,592 December 31, 2020 27,951 (1,936) (25,625) 390

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related and other commitments (see below) as well as derivative instruments (see Note 10). The following is a summary of lending-related commitments: ($ in Thousands) Sep 30, 2021 Dec 31, 2020 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 10,618,161 $ 10,010,492 Commercial letters of credit (a) 6,309 3,642 Standby letters of credit (c) 264,123 278,798 (a) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Nine months ended Sep 30, 2021 Year Ended Dec 31, 2020 Allowance for Unfunded Commitments Balance at beginning of period $ 47,776 $ 21,907 Cumulative effect of ASU 2016-13 adoption (CECL) N/A 18,690 Balance at beginning of period, adjusted 47,776 40,597 Provision for unfunded commitments (6,500) 7,000 Amount recorded at acquisition N/A 179 Balance at end of period $ 41,276 $ 47,776 Lending-related commitments include commitments to extend credit, commitments to originate residential mortgage loans held for sale, commercial letters of credit, and standby letters of credit. Commitments to extend credit are legally binding agreements to lend to customers at predetermined interest rates, as long as there is no violation of any condition established in the contracts. Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded in other assets and accrued expenses and other liabilities on the consolidated balance sheets. The Corporation’s derivative and hedging activity is further described in Note 10. Commercial and standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party, while 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. Other Commitments The Corporation invests in qualified affordable housing projects, federal and state historic projects, new market projects, and opportunity zone funds for the purpose of community reinvestment and obtaining tax credits and other tax benefits. Return on the Corporation's investment in these projects and funds comes in the form of the tax credits and tax losses that pass through to the Corporation, and deferral or elimination of capital gain recognition for tax purposes. The aggregate carrying value of these investments at September 30, 2021 was $277 million, compared to $272 million at December 31, 2020, included in tax credit and other investments on the consolidated balance sheets. The Corporation utilizes the proportional amortization method to account for investments in qualified affordable housing projects. Under the proportional amortization method, the Corporation amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits. The Corporation recognized additional income tax expense attributable to the amortization of investments in qualified affordable housing projects of $24 million and $18 million for the nine months ended September 30, 2021 and 2020, respectively, and $8 million and $6 million for the three months ended September 30, 2021 and 2020, respectively. The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $270 million at September 30, 2021 and $268 million at December 31, 2020. The Corporation’s unfunded equity contributions relating to investments in federal and state qualified affordable housing and federal and state historic projects are recorded in accrued expenses and other liabilities on the consolidated balance sheets. The Corporation’s remaining unfunded equity contributions totaled $101 million and $118 million at September 30, 2021 and December 31, 2020, respectively. For the nine months ended September 30, 2021 and the year ended December 31, 2020, the Corporation did not record any impairment related to qualified affordable housing investments. The Corporation has principal investment commitments to provide capital-based financing to private and public companies through either direct investment in specific companies or through investment funds and partnerships. The timing of future cash requirements to fund such principal investment commitments is generally dependent on the investment cycle, whereby privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, which can vary based on overall market conditions, as well as the nature and type of industry in which the companies operate. The Corporation also invests in loan pools that support CRA loans. The timing of future cash requirements to fund these pools is dependent upon loan demand, which can vary over time. The aggregate carrying value of these investments was $24 million and $25 million at September 30, 2021 and December 31, 2020, respectively, included in tax credit and other investments on the consolidated balance sheets. Legal Proceedings The Corporation is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which involve claims for substantial amounts. Although there can be no assurance as to the ultimate outcomes, the Corporation believes it has meritorious defenses to the claims asserted against it in its currently outstanding matters and intends to continue to defend itself vigorously with respect to such legal proceedings. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of the Corporation and its shareholders. On at least a quarterly basis, the Corporation assesses its liabilities and contingencies in connection with all pending or threatened claims and litigation, utilizing the most recent information available. On a matter by matter basis, an accrual for loss is established for those matters which the Corporation believes it is probable that a loss may be incurred and that the amount of such loss can be reasonably estimated. Once established, each accrual is adjusted as appropriate to reflect any subsequent developments. Accordingly, management’s estimate will change from time to time, and actual losses may be more or less than the current estimate. For matters where a loss is not probable, or the amount of the loss cannot be estimated, no accrual is established. Resolution of legal claims is inherently unpredictable, and in many legal proceedings various factors exacerbate this inherent unpredictability, including where the damages sought are unsubstantiated or indeterminate, it is unclear whether a case brought as a class action will be allowed to proceed on that basis, discovery is not complete, the proceeding is not yet in its final stages, the matters present legal uncertainties, there are significant facts in dispute, there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants), or there is a wide range of potential results. A lawsuit, Evans et al v. Associated Banc-Corp et al , was filed in the United States District Court for the Eastern District of Wisconsin - Green Bay Division on January 13, 2021 by one current and one former participant in the Associated Banc-Corp 401(k) and Employee Stock Ownership Plan (the “Plan”) as representatives of a putative class. The plaintiffs alleged that Associated Banc-Corp, the Associated Banc-Corp Plan Administrative Committee, and current and past members of such committee during the relevant time period (the “Defendants”) breached their fiduciary duties with respect to the Plan in violation of Employee Retirement Income Security Act of 1974, as amended, by applying an imprudent and inappropriate preference for products associated with Associated Banc-Corp within the Plan, and that the Defendants failed to monitor or control the recordkeeping expenses paid to Associated Trust Company, N.A. On March 18, 2021, the Defendants filed a motion to dismiss. On April 8, 2021, the plaintiffs filed an amended complaint which dropped the record keeping claim, added Associated Trust Company N.A. and Kellogg Asset Management, LLC as defendants, and alleged various breaches of fiduciary duty related to the selection and monitoring of, and the fees charged by, proprietary collective investment trusts. The plaintiffs, in part, seek an accounting and disgorgement of certain profits, as well as certain equitable restitution and equitable monetary relief. The Corporation intends to vigorously defend against this lawsuit. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time with respect to this lawsuit. Regulatory Matters A variety of consumer products, including mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters. Mortgage Repurchase Reserve The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under the Corporation's usual underwriting procedures, and are most often sold on a nonrecourse basis, primarily to the GSEs. The Corporation’s agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold, related to credit information, loan documentation, collateral, and insurability. Subsequent to being sold, if a material underwriting deficiency or documentation defect is discovered, the Corporation may be obligated to repurchase the loan or reimburse the GSEs for losses incurred (collectively, “make whole requests”). The make whole requests and any related risk of loss under the representations and warranties are largely driven by borrower performance. Additionally, beginning in the third quarter of 2021, qualifying residential mortgage loans guaranteed by U.S. government agencies have been sold into GNMA pools. As a result of make whole requests, the Corporation has repurchased loans with aggregate principal balances of $6 million and $10 million for the nine months ended September 30, 2021 and the year ended December 31, 2020, respectively. There were approximately $114,000 of loss reimbursement and settlement claims paid for the nine months ended September 30, 2021 and there were no such claims for the year ended December 31, 2020. Make whole requests during 2020 and the first nine months of 2021 generally arose from loans sold during the period of January 1, 2012 to December 31, 2020. Since January 1, 2012, loans sold totaled $15.7 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of September 30, 2021, $6.5 billion of these sold loans remain outstanding. The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The mortgage repurchase reserve, included in accrued expenses and other liabilities on the consolidated balance sheets, was $1 million as of September 30, 2021 and $2 million as of December 31, 2020. The Corporation may also sell residential mortgage loans with limited recourse (limited in that the recourse period ends prior to the loan’s maturity, usually after certain time and / or loan paydown criteria have been met), whereby repurchase could be required if the loan had defined delinquency issues during the limited recourse periods. At September 30, 2021 and December 31, 2020, there were $27 million and $36 million, respectively, of residential mortgage loans sold with such recourse risk. There have been limited instances and immaterial historical losses on repurchases for recourse under the limited recourse criteria. The Corporation has a subordinate position to the FHLB in the credit risk on residential mortgage loans it sold to the FHLB in exchange for a monthly credit enhancement fee. The Corporation has not sold loans to the FHLB with such credit risk retention since February 2005. At September 30, 2021 and December 31, 2020, there were $26 million and $33 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value represents the estimated price at which an orderly transaction to sell an asset or to transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept). The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in the Fair Value Measurements note in the Corporation’s 2020 Annual Report on Form 10-K. The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy Sep 30, 2021 Dec 31, 2020 Assets Investment securities AFS U.S. Treasury securities Level 1 $ 123,981 $ 26,531 Agency securities Level 2 14,998 25,038 Obligations of state and political subdivisions (municipal securities) Level 2 414,020 450,662 Residential mortgage-related securities FNMA / FHLMC Level 2 2,377,408 1,461,241 GNMA Level 2 79,696 235,537 Private-label Level 2 76,033 — Commercial mortgage-related securities FNMA / FHLMC Level 2 353,175 22,904 GNMA Level 2 231,096 524,756 Asset backed securities FFELP Level 2 212,797 327,189 SBA Level 2 7,179 8,584 Other debt securities Level 2 2,999 3,000 Total investment securities AFS Level 1 $ 123,981 $ 26,531 Total investment securities AFS Level 2 3,769,399 3,058,910 Equity securities with readily determinable fair values Level 1 4,109 1,661 Residential loans held for sale Level 2 158,202 129,158 Interest rate-related instruments (a) Level 2 110,898 192,518 Foreign currency exchange forwards (a) Level 2 4,637 4,909 Commodity contracts (a) Level 2 6,546 12,486 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 5,187 9,624 Forward commitments to sell residential mortgage loans Level 3 972 — Liabilities Interest rate-related instruments (a) Level 2 $ 24,322 $ 25,680 Foreign currency exchange forwards (a) Level 2 4,454 4,836 Commodity contracts (a) Level 2 6,471 11,155 Forward commitments to sell residential mortgage loans Level 3 — 2,046 (a) Figures are presented gross before netting. See Note 10 and Note 11 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the The table below presents a rollforward of the consolidated balance sheets amounts for the nine months ended September 30, 2021 and the year ended December 31, 2020, for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ in Thousands) Interest rate lock commitments to originate residential mortgage loans held for sale Forward commitments to sell residential mortgage loans Total Balance December 31, 2019 $ 2,527 $ 710 $ 1,817 New production 72,659 (3,505) 76,164 Closed loans / settlements (76,001) (12,587) (63,414) Other 10,439 17,427 (6,988) Mortgage derivative gain (loss) 7,097 1,335 5,762 Balance December 31, 2020 $ 9,624 $ 2,046 $ 7,579 New production $ 45,586 $ (2,496) $ 48,082 Closed loans / settlements (44,543) 217 (44,760) Other (5,481) (739) (4,742) Mortgage derivative gain (loss) (4,437) (3,017) (1,420) Balance September 30, 2021 $ 5,187 $ (972) $ 6,159 The closing ratio on interest rate lock commitments to originate residential mortgage loans held for sale is a Level 3 measurement, and was 82% at September 30, 2021. The following table presents the carrying value of equity securities without readily determinable fair values still held as of September 30, 2021 that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of September 30, 2021: ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2020 $ 13,444 Additions 552 Sales (33) Donations (134) Carrying value as of September 30, 2021 $ 13,830 Cumulative upward carrying value changes between January 1, 2018 and September 30, 2021 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2021 $ — The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall: Consolidated Statements of Income ($ in Thousands) Fair Value Hierarchy Fair Value Adjustment Recognized on the Consolidated Statements of Income (c) September 30, 2021 Assets Individually evaluated loans (a) Level 3 $ 78,139 Provision for credit losses $ (4,227) OREO (b) Level 2 21,847 Other noninterest expense / provision for credit losses (d) 6,449 Mortgage servicing rights Level 3 50,373 Mortgage banking, net 12,231 December 31, 2020 Assets Individually evaluated loans (a) Level 3 $ 138,752 Provision for credit losses $ 97,519 OREO (b) Level 2 6,125 Other noninterest expense 3,747 Mortgage servicing rights Level 3 41,990 Mortgage banking, net (17,704) (a) Includes probable TDRs which are individually analyzed, net of the related allowance for credit losses. Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a nonrecurring basis include the fair value analysis in the goodwill impairment test as well as intangible assets and other nonfinancial long-lived assets measured at fair value for the purpose of impairment assessment. The Corporation's significant Level 3 measurements which employ unobservable inputs that are readily quantifiable pertain to MSRs and individually evaluated loans. The table below presents information about these inputs and further discussion is found above: September 30, 2021 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Discount rate 9% - 15% 9% Mortgage servicing rights Discounted cash flow Constant prepayment rate 8% - 40% 15% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 33% - 51% 36% Fair Value of Financial Instruments The Corporation is required to disclose estimated fair values for its financial instruments. Fair value estimates are set forth below for the Corporation’s financial instruments: Sep 30, 2021 Dec 31, 2020 ($ in Thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 378,927 $ 378,927 $ 416,154 $ 416,154 Interest-bearing deposits in other financial institutions Level 1 1,281,916 1,281,916 298,759 298,759 Federal funds sold and securities purchased under agreements to resell Level 1 25,000 25,000 1,135 1,135 Investment securities AFS Level 1 123,981 123,981 26,531 26,531 Investment securities AFS Level 2 3,769,399 3,769,399 3,058,910 3,058,910 Investment securities HTM, net Level 1 1,000 1,007 999 1,024 Investment securities HTM, net Level 2 1,928,735 2,034,803 1,877,939 2,027,852 Equity securities with readily determinable fair values Level 1 4,109 4,109 1,661 1,661 Equity securities without readily determinable fair values Level 3 13,830 13,830 13,444 13,444 FHLB and Federal Reserve Bank stocks Level 2 168,281 168,281 168,280 168,280 Residential loans held for sale Level 2 158,202 158,202 129,158 129,158 Loans, net Level 3 23,330,676 23,447,728 24,068,022 24,012,738 Bank and corporate owned life insurance Level 2 683,610 683,610 679,647 679,647 Derivatives (other assets) (a) Level 2 122,082 122,082 209,913 209,913 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 5,187 5,187 9,624 9,624 Forward commitments to sell residential mortgage loans (other assets) Level 3 972 972 — — Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 26,440,380 $ 26,440,380 $ 24,725,451 $ 24,725,451 Brokered CDs and other time deposits (b) Level 2 1,410,886 1,412,950 1,757,030 1,766,200 Short-term funding Level 2 322,496 322,486 252,317 252,303 FHLB advances Level 2 1,620,880 1,701,512 1,632,723 1,760,727 Other long-term funding Level 2 249,160 270,526 549,465 578,233 Standby letters of credit (c) Level 2 2,549 2,549 2,731 2,731 Derivatives (accrued expenses and other liabilities) (a) Level 2 35,247 35,247 41,671 41,671 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 — — 2,046 2,046 (a) Figures are presented gross before netting. See Note 10 and Note 11 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit RAP, covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes. The Corporation also provides legacy healthcare access to a limited group of retired employees from a previous acquisition in the Postretirement Plan. There are no other active retiree healthcare plans. The First Staunton acquisition closed on February 14, 2020, and the employees who met the required criteria became eligible to participate in the RAP on February 15, 2020, with their vesting service credit based on their prior hours of service with First Staunton. See Note 2 for additional information on the First Staunton acquisition. The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Components of Net Periodic Benefit Cost RAP Service cost $ 1,684 $ 1,853 $ 5,835 $ 6,183 Interest cost 1,682 2,124 4,927 6,139 Expected return on plan assets (6,395) (6,386) (19,256) (19,196) Amortization of prior service cost (19) (18) (55) (55) Amortization of actuarial loss (gain) 1,346 1,313 3,446 2,923 Total net periodic pension cost $ (1,701) $ (1,114) $ (5,103) $ (4,006) Postretirement Plan Interest cost $ 13 $ 20 $ 39 $ 59 Amortization of prior service cost (19) (19) (56) (56) Total net periodic benefit cost $ (6) $ 1 $ (17) $ 2 The components of net periodic pension cost and net periodic benefit cost, other than the service cost component, are included in the line item other of noninterest expense on the consolidated statements of income. The service cost components are included in personnel on the consolidated statements of income. The Corporation’s funding policy is to pay at least the minimum amount required by federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its RAP. There were no contributions during the nine months ended September 30, 2021 and 2020.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Corporation utilizes a risk-based internal profitability measurement system to provide strategic business unit reporting. The profitability measurement system is based on internal management methodologies designed to produce consistent results and reflect the underlying economics of the units. 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 three reportable segments are Corporate and Commercial Specialty; Community, Consumer, and Business; and Risk Management and Shared Services. The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation’s 2020 Annual Report on Form 10-K with certain exceptions. The more significant of these exceptions are described herein. The reportable segment results are presented based on the Corporation's internal management accounting process. 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 U.S. GAAP. As a result, reported segments and the financial information of the reported segments are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in previously reported segment financial data. Additionally, the information presented is not indicative of how the segments would perform if they operated as independent entities. To determine financial performance of each segment, the Corporation allocates FTP assignments, the provision for credit losses, certain noninterest expenses, income taxes, and equity to each segment. Allocation methodologies are subject to periodic adjustment as the internal management accounting system is revised, the interest rate environment evolves, and business or product lines within the segments change. Also, because the development and application of these methodologies is a dynamic process, the financial results presented may be periodically reviewed. The Corporation allocates net interest income using an internal FTP methodology that charges users of funds (assets) and credits providers of funds (liabilities, primarily deposits) based on the maturity, prepayment and / or re-pricing characteristics of the assets and liabilities. The net effect of this allocation is offset in the Risk Management and Shared Services segment to ensure consolidated totals reflect the Corporation's net interest income. The net FTP allocation is reflected as net intersegment interest income (expense) in the accompanying tables. A provision for credit losses is allocated to segments based on the expected long-term annual net charge off rates attributable to the credit risk of loans managed by the segment during the period. In contrast, the level of the consolidated provision for credit losses is determined based on an ACLL model using the methodologies described in the Corporation’s 2020 Annual Report on Form 10-K. The net effect of the credit provision is recorded in Risk Management and Shared Services. Indirect expenses incurred by certain centralized support areas are allocated to segments based on actual usage (for example, volume measurements) and other criteria. Certain types of administrative expense and bank-wide expense accruals (including amortization of CDIs and other intangible assets associated with acquisitions, acquisition-related costs, and asset gains on disposed business units) are generally not allocated to segments. Income taxes are allocated to segments based on the Corporation’s estimated effective tax rate, with certain segments adjusted for any tax-exempt income or non-deductible expenses. Equity is allocated to the segments based on regulatory capital requirements and in proportion to an assessment of the inherent risks associated with the business of the segment (including interest, credit and operating risk). A brief description of each business segment is presented below. A more in-depth discussion of these segments can be found in the Segment Reporting note in the Corporation’s 2020 Annual Report on Form 10-K. The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, not-for-profits, municipalities, and financial institutions by providing lending and deposit solutions as well as the support to deliver, fund, and manage such banking solutions. In addition, this segment provides a variety of investment, fiduciary, and retirement planning products and services to individuals and small to mid-sized businesses. During the first quarter of 2021, the Corporation sold its wealth management subsidiary Whitnell. The Community, Consumer, and Business segment serves individuals, as well as small and mid-sized businesses, by providing lending and deposit solutions. In addition, until June 30, 2020, the Corporation offered insurance and risk consulting services. The Risk Management and Shared Services segment includes key shared operational functions and also includes residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (FTP mismatches) and credit risk and provision residuals (long-term credit charge mismatches). Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 93,768 $ 92,033 $ 280,295 $ 298,611 Net intersegment interest income (expense) 5,884 6,937 18,962 3,123 Segment net interest income 99,652 98,970 299,257 301,734 Noninterest income (a) 43,228 37,405 124,847 111,254 Total revenue 142,881 136,376 424,104 412,987 Provision for credit losses 14,864 15,572 48,803 41,456 Noninterest expense 58,652 52,635 172,781 160,899 Income (loss) before income taxes 69,364 68,169 202,521 210,633 Income tax expense (benefit) 12,617 12,497 37,213 39,161 Net income $ 56,747 $ 55,672 $ 165,307 $ 171,472 Allocated goodwill $ 525,836 $ 530,144 Community, Consumer, and Business Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 70,860 $ 73,644 $ 209,285 $ 221,691 Net intersegment interest income (expense) 12,907 9,231 39,705 42,213 Segment net interest income 83,767 82,875 248,990 263,904 Noninterest income 35,771 32,958 113,558 140,442 Total revenue 119,538 115,833 362,548 404,345 Provision for credit losses 4,233 5,758 13,897 16,296 Noninterest expense 94,762 102,139 290,443 335,675 Income (loss) before income taxes 20,543 7,936 58,209 52,374 Income tax expense (benefit) 4,314 1,667 12,224 10,999 Net income $ 16,230 $ 6,269 $ 45,985 $ 41,376 Allocated goodwill $ 579,156 $ 577,758 Risk Management and Shared Services Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 19,047 $ 16,472 $ 49,511 $ 54,662 Net intersegment interest income (expense) (18,791) (16,167) (58,666) (45,336) Segment net interest income 256 305 (9,155) 9,326 Noninterest income (b) 3,077 5,182 12,457 176,646 Total revenue 3,333 5,487 3,301 185,973 Provision for credit losses (43,107) 21,679 (144,717) 99,257 Noninterest expense 24,478 72,813 64,490 106,610 Income (loss) before income taxes 21,962 (89,005) 83,529 (19,895) Income tax expense (benefit) 6,129 (72,278) 20,705 (46,817) Net income $ 15,833 $ (16,727) $ 62,824 $ 26,922 Allocated goodwill $ — $ — Consolidated Total Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 183,675 $ 182,150 $ 539,092 $ 574,964 Net intersegment interest income (expense) — — — — Segment net interest income 183,675 182,150 539,092 574,964 Noninterest income (a)(b) 82,076 75,545 250,862 428,342 Total revenue 265,752 257,695 789,954 1,003,305 Provision for credit losses (24,010) 43,009 (82,018) 157,009 Noninterest expense 177,892 227,587 527,713 603,184 Income (loss) before income taxes 111,870 (12,900) 344,259 243,112 Income tax expense (benefit) 23,060 (58,114) 70,142 3,342 Net income $ 88,809 $ 45,214 $ 274,117 $ 239,769 Allocated goodwill $ 1,104,992 $ 1,107,902

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2021 and 2020, including changes during the preceding three and nine month periods as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Defined Benefit Accumulated Balance December 31, 2020 $ 41,325 $ (28,707) $ 12,618 Other comprehensive income (loss) before reclassifications (35,829) — (35,829) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net 16 — 16 Personnel expense — (111) (111) Other expense — 3,446 3,446 Interest income 1,335 — 1,335 Income tax (expense) benefit 8,548 (836) 7,712 Net other comprehensive income (loss) during period (25,930) 2,498 (23,431) Balance September 30, 2021 $ 15,395 $ (26,209) $ (10,813) Balance December 31, 2019 $ 3,989 $ (37,172) $ (33,183) Other comprehensive income (loss) before reclassifications 53,900 — 53,900 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (9,222) — (9,222) Personnel expense — (111) (111) Other expense — 2,923 2,923 Interest income 2,628 — 2,628 Income tax (expense) benefit (11,852) (1,088) (12,939) Net other comprehensive income (loss) during period 35,454 1,724 37,178 Balance September 30, 2020 $ 39,443 $ (35,448) $ 3,995 ($ in Thousands) Investments Defined Benefit Accumulated Balance June 30, 2021 $ 30,076 $ (27,187) $ 2,889 Other comprehensive income (loss) before reclassifications (19,827) — (19,827) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net — — — Personnel expense — (37) (37) Other expense — 1,346 1,346 Interest income 172 — 172 Income tax (expense) benefit 4,975 (330) 4,644 Net other comprehensive income (loss) during period (14,681) 979 (13,702) Balance September 30, 2021 $ 15,395 $ (26,209) $ (10,813) Balance June 30, 2020 $ 34,101 $ (36,021) $ (1,920) Other comprehensive income (loss) before reclassifications 5,840 — 5,840 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (7) — (7) Personnel expense — (36) (36) Other expense — 1,313 1,313 Interest income 1,296 — 1,296 Income tax (expense) benefit (1,786) (703) (2,489) Net other comprehensive income (loss) during period 5,342 573 5,916 Balance September 30, 2020 $ 39,443 $ (35,448) $ 3,995

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2021
Revenue Recognition [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Revenue from contracts with customers is recognized when obligations under the terms of a contract with the Corporation's customer are satisfied. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. We do not have any material significant payment terms as payment is received at or shortly after the satisfaction of the performance obligation. The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Wealth management fees $ 22,110 $ 21,152 $ 67,229 $ 61,496 Service charges and deposit account fees 4,539 4,458 13,898 12,316 Card-based fees (a) 541 474 1,367 1,216 Insurance commissions and fees 36 57 98 179 Other revenue 772 1,400 2,619 2,481 Noninterest income (in-scope of Topic 606) $ 27,998 $ 27,540 $ 85,212 $ 77,690 Noninterest income (out-of-scope of Topic 606) (b) 15,230 9,866 39,635 33,564 Total noninterest income $ 43,228 $ 37,405 $ 124,847 $ 111,254 Community, Consumer, and Business Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Wealth management fees $ — $ — $ — $ 1,387 Service charges and deposit account fees 12,417 9,816 33,441 28,653 Card-based fees (a) 10,600 9,699 30,538 27,392 Insurance commissions and fees 50 55 146 44,965 Other revenue 1,945 2,168 7,459 7,315 Noninterest income (in-scope of Topic 606) $ 25,012 $ 21,739 $ 71,583 $ 109,713 Noninterest income (out-of-scope of Topic 606) 10,758 11,219 41,976 30,728 Total noninterest income $ 35,771 $ 32,958 $ 113,558 $ 140,442 Risk Management and Shared Services Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Service charges and deposit account fees $ 5 $ 10 $ 27 $ 19 Card-based fees (a) 6 34 15 127 Insurance commissions and fees 2 2 6 8 Other revenue 76 (82) 1,540 (33) Noninterest income (in-scope of Topic 606) $ 89 $ (36) $ 1,588 $ 121 Noninterest income (out-of-scope of Topic 606) (c) 2,989 5,218 10,868 176,525 Total noninterest income $ 3,077 $ 5,182 $ 12,457 $ 176,646 Consolidated Total Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Wealth management fees $ 22,110 $ 21,152 $ 67,229 $ 62,884 Service charges and deposit account fees 16,962 14,283 47,366 40,989 Card-based fees (a) 11,147 10,207 31,920 28,736 Insurance commissions and fees 88 114 250 45,153 Other revenue 2,792 3,487 11,618 9,764 Noninterest income (in-scope of Topic 606) $ 53,099 $ 49,243 $ 158,383 $ 187,524 Noninterest income (out-of-scope of Topic 606) (b)(c) 28,977 26,303 92,479 240,818 Total noninterest income $ 82,076 $ 75,545 $ 250,862 $ 428,342 (a) Certain card-based fees are out-of-scope of Topic 606. (b) For the nine months ended September 30, 2021, the Corporation recognized a $2 million pre-tax gain on the sale of Whitnell. (c) For the nine months ended September 30, 2020, the Corporation recognized a $163 million pre-tax gain on the sale of ABRC. Below is a listing of performance obligations for the Corporation's main revenue streams: Revenue Stream Noninterest income in-scope of Topic 606 Service charges and deposit account fees Service charges and deposit account fees consist of monthly service fees (i.e. business analyzed fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges and deposit account fees is primarily received immediately or in the following month through a direct charge to customers’ accounts. Card-based fees (a) Card-based fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month. Trust and asset management fees (b) Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to the customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and advisory fees (b) Brokerage and advisory fees primarily consist of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage and advisory fees are included in wealth management fees.

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. The Corporation also has a finance lease for land. These leases have original terms of 1 year or longer with remaining maturities up to 41 years, some of which include options to extend the lease term. An analysis of the lease options has been completed and any purchase options or optional periods that the Corporation is reasonably likely to extend have been included in the capitalization. The discount rate used to capitalize the operating leases is the Corporation's FHLB borrowing rate on the date of lease commencement. When determining the rate to discount specific lease obligations, the repayment period and term are considered. Operating and finance lease costs and cash flows resulting from these leases are presented below: Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Operating lease costs $ 2,367 $ 3,970 $ 6,850 $ 9,224 Finance lease costs 17 39 76 115 Operating lease cash flows 2,858 2,871 8,598 8,303 Finance lease cash flows 21 40 101 82 The lease classifications on the consolidated balance sheets were as follows: ($ in Thousands) Consolidated Balance Sheets Category Sep 30, 2021 Dec 31, 2020 Operating lease right-of-use asset Premises and equipment $ 29,527 $ 31,994 Finance lease right-of-use asset Other assets 59 962 Operating lease liability Accrued expenses and other liabilities 33,066 36,425 Finance lease liability Other long-term funding 72 1,128 The lease payment obligations, weighted-average remaining lease term, and weighted-average original discount rate were as follows: Sep 30, 2021 Dec 31, 2020 ($ in Thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment $ 192 1.74 0.46 % $ 386 2.49 0.46 % Retail and corporate offices 30,756 5.55 3.24 % 34,036 6.04 3.33 % Land 5,747 8.48 3.11 % 6,385 8.99 3.09 % Total operating leases $ 36,696 5.97 3.21 % $ 40,806 6.45 3.27 % Finance leases Land $ 73 0.92 1.07 % $ 1,145 1.65 1.05 % Total finance leases $ 73 0.92 1.07 % $ 1,145 1.65 1.05 % Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Three Months Ending December 31, 2021 $ 2,326 $ 21 $ 2,348 2022 8,061 51 8,112 2023 6,108 — 6,108 2024 5,317 — 5,317 2025 4,076 — 4,076 Beyond 2025 10,807 — 10,807 Total lease payments $ 36,696 $ 73 $ 36,768 Less: interest 3,630 — 3,630 Present value of lease payments $ 33,066 $ 72 $ 33,138

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2019-12 The FASB issued this amendment to simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendment also improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendment was permitted. 1st Quarter 2021 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity. ASU 2020-08 Codification Improvements to Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs The FASB issued this amendment to clarify that an entity should reevaluate whether a callable debt security is within the scope of paragraph 310-20-35-33 for each reporting period. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendments was not permitted. 1st Quarter 2021 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity. Future Accounting Pronouncements There are no applicable material accounting pronouncements recently issued that have not yet been adopted by the Corporation.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	Feb. 14, 2020
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the First Staunton acquisition: ($ in Thousands) Purchase Accounting Adjustments February 14, 2020 Assets Cash and cash equivalents $ — $ 44,782 Investment securities AFS (24) 98,743 Federal Home Loan Bank and Federal Reserve Bank stocks, at cost — 781 Loans (4,808) 369,741 Premises and equipment, net (3,005) 4,865 Bank owned life insurance 9 6,770 Goodwill 14,812 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 7,379 7,379 OREO (included in other assets on the face of the consolidated balance sheets) 670 762 Other assets 2,795 7,692 Total assets $ 556,328 Liabilities Deposits $ 1,285 $ 438,684 Other borrowings 61 34,613 Accrued expenses and other liabilities 179 6,730 Total liabilities $ 480,028 Total consideration paid $ 76,300
Financing Receivable, Purchased With Credit Deterioration	The carrying amount of those loans is as follows: ($ in Thousands) February 14, 2020 Purchase price of loans at acquisition $ 77,221 Allowance for credit losses at acquisition 3,504 Non-credit discount/(premium) at acquisition (951) Par value of acquired loans at acquisition $ 79,774

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Calculations for basic and diluted earnings per common share	Presented below are the calculations for basic and diluted earnings per common share: Three Months Ended Sep 30, Nine Months Ended Sep 30, (In Thousands, except per share data) 2021 2020 2021 2020 Net income $ 88,809 $ 45,214 $ 274,117 $ 239,769 Preferred stock dividends (4,155) (5,207) (14,236) (13,152) Net income available to common equity $ 84,655 $ 40,007 $ 259,880 $ 226,618 Common shareholder dividends (30,323) (27,676) (85,604) (83,607) Unvested share-based payment awards (222) (199) (634) (549) Undistributed earnings $ 54,109 $ 12,133 $ 173,642 $ 142,462 Undistributed earnings allocated to common shareholders $ 53,716 $ 12,045 $ 172,436 $ 141,426 Undistributed earnings allocated to unvested share-based payment awards 393 87 1,206 1,036 Undistributed earnings $ 54,109 $ 12,133 $ 173,642 $ 142,462 Basic Distributed earnings to common shareholders $ 30,323 $ 27,676 $ 85,604 $ 83,607 Undistributed earnings allocated to common shareholders 53,716 12,045 172,436 141,426 Total common shareholders earnings, basic $ 84,039 $ 39,721 $ 258,040 $ 225,032 Diluted Distributed earnings to common shareholders $ 30,323 $ 27,676 $ 85,604 $ 83,607 Undistributed earnings allocated to common shareholders 53,716 12,045 172,436 141,426 Total common shareholders earnings, diluted $ 84,039 $ 39,721 $ 258,040 $ 225,032 Weighted average common shares outstanding 150,046 152,440 151,473 153,175 Effect of dilutive common stock awards 1,096 754 1,228 739 Diluted weighted average common shares outstanding 151,143 153,194 152,701 153,914 Basic earnings per common share $ 0.56 $ 0.26 $ 1.70 $ 1.47 Diluted earnings per common share $ 0.56 $ 0.26 $ 1.69 $ 1.46

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Fair value assumptions of stock options	The following assumptions were used in estimating the fair value for options granted for the full year 2020: 2020 Dividend yield 3.50 % Risk-free interest rate 1.60 % Weighted average expected volatility 21.00 % Weighted average expected life 5.75 years Weighted average per share fair value of options $2.39
Summary of company's stock option activities	A summary of the Corporation’s stock option activity for the nine months ended September 30, 2021 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2020 6,473 $ 19.77 6.23 years $ 2,005 Exercised 1,116 16.36 Forfeited or expired 97 22.61 Outstanding at September 30, 2021 5,260 $ 20.44 6.01 years $ 11,044 Options Exercisable at September 30, 2021 3,694 $ 20.58 5.19 years $ 8,062 (a) In thousands
Summary of restricted stock awards activity (excluding salary shares)	The following table summarizes information about the Corporation’s restricted stock awards activity for the nine months ended September 30, 2021: Restricted Stock Awards Shares (a) Weighted Average Outstanding at December 31, 2020 2,293 $ 20.70 Granted 1,212 20.00 Vested 797 21.23 Forfeited 52 22.39 Outstanding at September 30, 2021 2,656 $ 19.86 (a) In thousands

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	The amortized cost and fair values of securities AFS and HTM at September 30, 2021 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 124,253 $ 46 $ (319) $ 123,981 Agency securities 15,000 — (2) 14,998 Obligations of state and political subdivisions (municipal securities) 394,310 19,709 — 414,020 Residential mortgage-related securities FNMA / FHLMC 2,377,335 9,216 (9,144) 2,377,408 GNMA 77,199 2,497 — 79,696 Private-label 76,033 — — 76,033 Commercial mortgage-related securities FNMA / FHLMC 357,837 2,230 (6,892) 353,175 GNMA 227,622 3,474 — 231,096 Asset backed securities FFELP 212,378 890 (471) 212,797 SBA 7,182 44 (48) 7,179 Other debt securities 3,000 — (1) 2,999 Total investment securities AFS $ 3,872,150 $ 38,106 $ (16,877) $ 3,893,379 Investment securities HTM U. S. Treasury securities $ 1,000 $ 7 $ — $ 1,007 Obligations of state and political subdivisions (municipal securities) 1,541,443 106,181 (3,996) 1,643,628 Residential mortgage-related securities FNMA / FHLMC 37,318 2,129 — 39,447 GNMA 54,900 2,328 — 57,228 Commercial mortgage-related securities FNMA/FHLMC 170,739 248 (4,002) 166,985 GNMA 124,383 3,202 (22) 127,562 Total investment securities HTM $ 1,929,783 $ 114,095 $ (8,019) $ 2,035,858 The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U. S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943
Investment securities held to maturity	The amortized cost and fair values of securities AFS and HTM at September 30, 2021 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 124,253 $ 46 $ (319) $ 123,981 Agency securities 15,000 — (2) 14,998 Obligations of state and political subdivisions (municipal securities) 394,310 19,709 — 414,020 Residential mortgage-related securities FNMA / FHLMC 2,377,335 9,216 (9,144) 2,377,408 GNMA 77,199 2,497 — 79,696 Private-label 76,033 — — 76,033 Commercial mortgage-related securities FNMA / FHLMC 357,837 2,230 (6,892) 353,175 GNMA 227,622 3,474 — 231,096 Asset backed securities FFELP 212,378 890 (471) 212,797 SBA 7,182 44 (48) 7,179 Other debt securities 3,000 — (1) 2,999 Total investment securities AFS $ 3,872,150 $ 38,106 $ (16,877) $ 3,893,379 Investment securities HTM U. S. Treasury securities $ 1,000 $ 7 $ — $ 1,007 Obligations of state and political subdivisions (municipal securities) 1,541,443 106,181 (3,996) 1,643,628 Residential mortgage-related securities FNMA / FHLMC 37,318 2,129 — 39,447 GNMA 54,900 2,328 — 57,228 Commercial mortgage-related securities FNMA/FHLMC 170,739 248 (4,002) 166,985 GNMA 124,383 3,202 (22) 127,562 Total investment securities HTM $ 1,929,783 $ 114,095 $ (8,019) $ 2,035,858 The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U. S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943
Amortized cost and fair values of investment securities by contractual maturity	The expected maturities of investment securities AFS and HTM at September 30, 2021, are shown below: AFS HTM ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 7,987 $ 7,996 $ 27,797 $ 27,982 Due after one year through five years 75,545 75,970 39,029 40,265 Due after five years through ten years 415,467 430,634 181,911 189,290 Due after ten years 37,565 41,396 1,293,705 1,387,099 Total debt securities 536,564 555,997 1,542,442 1,644,635 Residential mortgage-related securities FNMA / FHLMC 2,377,335 2,377,408 37,318 39,447 GNMA 77,199 79,696 54,900 57,228 Private-label 76,033 76,033 — — Commercial mortgage-related securities FNMA / FHLMC 357,837 353,175 170,739 166,985 GNMA 227,622 231,096 124,383 127,562 Asset backed securities FFELP 212,378 212,797 — — SBA 7,182 7,179 — — Total investment securities $ 3,872,150 $ 3,893,379 $ 1,929,783 $ 2,035,858 Ratio of fair value to amortized cost 100.5 % 105.5 %
Debt Securities, Held-to-maturity, Credit Quality Indicator	The following table summarizes the credit quality indicators of HTM securities at amortized cost at September 30, 2021: ($ in Thousands) AAA AA A Not Rated Total U. S. Treasury securities $ 1,000 $ — $ — $ — $ 1,000 Obligations of state and political subdivisions (municipal securities) 683,098 847,641 10,511 194 1,541,443 Residential mortgage-related securities FNMA / FHLMC 37,318 — — — 37,318 GNMA 54,900 — — — 54,900 Commercial mortgage-related securities FNMA / FHLMC 170,739 — — — 170,739 GNMA 124,383 — — — 124,383 Total HTM securities $ 1,071,438 $ 847,641 $ 10,511 $ 194 $ 1,929,783 The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020: ($ in Thousands) AAA AA A Total U. S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,252 860,607 14,041 1,441,900 Residential mortgage-related securities FNMA / FHLMC 54,599 — — 54,599 GNMA 114,553 — — 114,553 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 — — 255,742 Total HTM securities $ 1,004,357 $ 860,607 $ 14,041 $ 1,879,005
Realized gains and losses and proceeds from sale	The proceeds from the sale of investment securities for the three and nine months ended September 30, 2021 and 2020, are shown below: Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Gross gains on AFS securities $ — $ 7 $ 421 $ 9,312 Gross (losses) on AFS securities — — (437) (90) Investment securities gains (losses), net $ — $ 7 $ (16) $ 9,222 Proceeds from sales of investment securities $ — $ 8 $ 158,708 $ 626,283
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length	The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2021: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS U.S. Treasury securities 4 $ (319) $ 84,071 — — $ — $ (319) $ 84,071 Agency securities 1 (2) 14,998 — — — (2) 14,998 Residential mortgage-related securities FNMA / FHLMC 33 (9,144) 1,170,981 — — — (9,144) 1,170,981 GNMA 1 — 69 — — — — 69 FNMA / FHLMC commercial mortgage-related securities 19 (6,892) 331,504 — — — (6,892) 331,504 Asset backed securities FFELP 1 (124) 34,876 8 (347) 65,002 (471) 99,878 SBA — — — 9 (48) 4,229 (48) 4,229 Other debt securities 1 (1) 999 — — — (1) 999 Total 60 $ (16,482) $ 1,637,498 17 $ (395) $ 69,231 $ (16,877) $ 1,706,729 Investment securities HTM Obligations of state and political subdivisions (municipal securities) 62 $ (3,996) $ 151,216 — $ — $ — $ (3,996) $ 151,216 Commercial mortgage-related securities FNMA / FHLMC 11 (4,002) 146,248 — — — (4,002) 146,248 GNMA 1 (22) 15,631 — — — (22) 15,631 Total 74 $ (8,019) $ 313,096 — $ — $ — $ (8,019) $ 313,096 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS Residential mortgage-related securities FNMA / FHLMC 7 $ (500) $ 163,002 — $ — $ — $ (500) $ 163,002 GNMA 2 (3) 9,784 — — — (3) 9,784 GNMA commercial mortgage-related securities 1 — 287 — — — — 287 Asset backed securities FFELP 1 (129) 9,267 16 (2,885) 178,681 (3,013) 187,948 SBA 14 (53) 8,379 — — — (53) 8,379 Other debt securities 2 — 2,000 — — — — 2,000 Total 27 $ (685) $ 192,720 16 $ (2,885) $ 178,681 $ (3,570) $ 371,400 Investment securities HTM GNMA residential mortgage-related securities 1 $ — $ 325 — $ — $ — $ — $ 325 Total 1 $ — $ 325 — $ — $ — $ — $ 325

Loans Loans (Tables)

Loans Loans (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Loan composition	The period end loan composition was as follows: ($ in Thousands) Sep 30, 2021 Dec 31, 2020 PPP $ 182,121 $ 767,757 Commercial and industrial 7,927,459 7,701,422 Commercial real estate — owner occupied 879,554 900,912 Commercial and business lending 8,989,133 9,370,091 Commercial real estate — investor 4,296,489 4,342,584 Real estate construction 1,834,871 1,840,417 Commercial real estate lending 6,131,360 6,183,001 Total commercial 15,120,493 15,553,091 Residential mortgage 7,590,895 7,878,324 Home equity 608,566 707,255 Other consumer 294,979 301,876 Auto 6,739 11,177 Total consumer 8,501,180 8,898,632 Total loans $ 23,621,673 $ 24,451,724
Commercial and consumer loans by credit quality indicator	he following table presents commercial and consumer loans by credit quality indicator by vintage year at September 30, 2021: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 147,568 $ 29,900 $ — $ — $ — $ — $ 177,467 Special Mention — — 212 281 — — — — 493 Potential Problem — — 4,160 — — — — — 4,160 PPP $ — $ — $ 151,940 $ 30,180 $ — $ — $ — $ — $ 182,121 Commercial and industrial: Risk rating: Pass $ 2,085 $ 2,278,181 $ 1,664,130 $ 1,046,760 $ 1,092,662 $ 802,214 $ 249,129 $ 621,500 $ 7,754,575 Special Mention — 1,396 5,900 193 28,918 — — 2,990 39,397 Potential Problem 2,825 27,948 1,933 5,555 46,997 21,286 20,111 1,160 124,990 Nonaccrual — — 17 166 108 7,248 — 959 8,497 Commercial and industrial $ 4,910 $ 2,307,525 $ 1,671,979 $ 1,052,674 $ 1,168,685 $ 830,748 $ 269,240 $ 626,609 $ 7,927,459 Commercial real estate - owner occupied: Risk rating: Pass $ 11,667 $ 22,430 $ 143,911 $ 173,396 $ 193,463 $ 114,618 $ 61,713 $ 133,641 $ 843,173 Special Mention — 211 — 3,303 11,368 — — 250 15,132 Potential Problem — 487 6,182 5,969 686 748 2,640 4,529 21,241 Nonaccrual — — — — — — — 7 7 Commercial real estate - owner occupied $ 11,667 $ 23,127 $ 150,094 $ 182,668 $ 205,518 $ 115,366 $ 64,353 $ 138,427 $ 879,554 Commercial and business lending: Risk rating: Pass $ 13,752 $ 2,300,611 $ 1,955,609 $ 1,250,056 $ 1,286,125 $ 916,832 $ 310,842 $ 755,141 $ 8,775,216 Special Mention — 1,606 6,112 3,777 40,287 — — 3,240 55,022 Potential Problem 2,825 28,435 12,275 11,524 47,683 22,034 22,751 5,688 150,391 Nonaccrual — — 17 166 108 7,248 — 966 8,504 Commercial and business lending $ 16,577 $ 2,330,652 $ 1,974,013 $ 1,265,523 $ 1,374,203 $ 946,114 $ 333,593 $ 765,036 $ 8,989,133 Commercial real estate - investor: Risk rating: Pass $ 38,041 $ 85,353 $ 878,373 $ 957,478 $ 1,034,119 $ 474,770 $ 178,270 $ 335,168 $ 3,943,532 Special Mention — — 57,100 67,285 74,040 5,973 1,259 6,836 212,491 Potential Problem — — 5,474 25,720 4,074 24,259 4,730 14,705 78,962 Nonaccrual — — 23,973 8,412 9,690 19,222 — 207 61,504 Commercial real estate - investor $ 38,041 $ 85,353 $ 964,920 $ 1,058,894 $ 1,121,923 $ 524,225 $ 184,259 $ 356,916 $ 4,296,489 Real estate construction: Risk rating: Pass $ — $ 26,560 $ 581,257 $ 731,505 $ 328,020 $ 93,893 $ 21,154 $ 13,227 $ 1,795,616 Special Mention — — — — 3,894 15,885 41 — 19,820 Potential Problem — — 8 124 18,968 — — 87 19,187 Nonaccrual — — — 5 — — — 242 247 Real estate construction $ — $ 26,560 $ 581,265 $ 731,634 $ 350,881 $ 109,778 $ 21,195 $ 13,556 $ 1,834,871 Commercial real estate lending: Risk rating: Pass $ 38,041 $ 111,913 $ 1,459,630 $ 1,688,983 $ 1,362,139 $ 568,663 $ 199,424 $ 348,395 $ 5,739,148 Special Mention — — 57,100 67,285 77,934 21,858 1,300 6,836 232,312 Potential Problem — — 5,483 25,844 23,041 24,259 4,730 14,792 98,150 Nonaccrual — — 23,973 8,417 9,690 19,222 — 448 61,751 Commercial real estate lending $ 38,041 $ 111,913 $ 1,546,185 $ 1,790,529 $ 1,472,804 $ 634,002 $ 205,454 $ 370,472 $ 6,131,360 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total Total commercial: Risk rating: Pass $ 51,793 $ 2,412,524 $ 3,415,239 $ 2,939,040 $ 2,648,264 $ 1,485,495 $ 510,266 $ 1,103,537 $ 14,514,363 Special Mention — 1,606 63,212 71,061 118,220 21,858 1,300 10,076 287,333 Potential Problem 2,825 28,435 17,758 37,367 70,725 46,294 27,481 20,481 248,541 Nonaccrual — — 23,989 8,584 9,798 26,470 — 1,415 70,256 Total commercial $ 54,618 $ 2,442,565 $ 3,520,198 $ 3,056,052 $ 2,847,007 $ 1,580,116 $ 539,047 $ 1,135,508 $ 15,120,493 Residential mortgage: Risk rating: Pass $ — $ — $ 1,404,558 $ 2,040,914 $ 1,048,656 $ 460,120 $ 722,589 $ 1,854,629 $ 7,531,466 Special Mention — — — — — — — 377 377 Potential Problem — — 538 340 409 326 82 679 2,374 Nonaccrual — — 1,721 2,032 4,483 4,979 7,304 36,160 56,678 Residential mortgage $ — $ — $ 1,406,816 $ 2,043,286 $ 1,053,548 $ 465,425 $ 729,974 $ 1,891,844 $ 7,590,895 Home equity: Risk rating: Pass $ 4,992 $ 504,747 $ 773 $ 1,617 $ 8,850 $ 9,952 $ 8,538 $ 65,577 $ 600,053 Special Mention 74 17 — — 1 110 — 375 503 Potential Problem 10 — 10 — — 15 — 146 171 Nonaccrual 582 4 56 25 227 288 303 6,936 7,838 Home equity $ 5,658 $ 504,767 $ 839 $ 1,643 $ 9,078 $ 10,364 $ 8,841 $ 73,034 $ 608,566 Other consumer: Risk rating: Pass $ 402 $ 168,534 $ 7,455 $ 6,730 $ 6,232 $ 1,940 $ 815 $ 109,253 $ 300,959 Special Mention 64 387 — — 13 66 — 4 470 Nonaccrual 4 164 — 12 56 20 20 18 290 Other consumer $ 471 $ 169,084 $ 7,455 $ 6,743 $ 6,300 $ 2,026 $ 835 $ 109,275 $ 301,718 Total consumer: Risk rating: Pass $ 5,394 $ 673,281 $ 1,412,786 $ 2,049,262 $ 1,063,738 $ 472,012 $ 731,942 $ 2,029,458 $ 8,432,478 Special Mention 138 403 — — 14 176 — 756 1,350 Potential Problem 10 — 548 340 409 341 82 825 2,546 Nonaccrual 586 167 1,776 2,070 4,765 5,287 7,627 43,114 64,806 Total consumer $ 6,128 $ 673,852 $ 1,415,110 $ 2,051,672 $ 1,068,927 $ 477,816 $ 739,650 $ 2,074,153 $ 8,501,180 Total loans: Risk rating: Pass (c) $ 57,187 $ 3,085,805 $ 4,828,025 $ 4,988,301 $ 3,712,002 $ 1,957,507 $ 1,242,208 $ 3,132,995 $ 22,946,842 Special Mention 138 2,010 63,212 71,061 118,234 22,034 1,300 10,832 288,683 Potential Problem 2,836 28,435 18,306 37,707 71,134 46,635 27,563 21,305 251,087 Nonaccrual 586 167 25,766 10,653 14,563 31,756 7,627 44,529 135,062 Total loans $ 60,747 $ 3,116,417 $ 4,935,308 $ 5,107,723 $ 3,915,934 $ 2,057,932 $ 1,278,698 $ 3,209,661 $ 23,621,673 (a) Revolving loans converted to term loans are also reported in their year of origination. (b) The Corporation’s policy is to assign risk ratings at the borrower level. PPP loans are 100% guaranteed by the SBA and therefore the Corporation considers these loans to have a risk profile similar to pass rated loans. (c) Accruing TDRs are included in pass unless otherwise rated as special mention. The following table presents commercial and consumer loans by credit quality indicator by vintage year at December 31, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 745,767 $ — $ — $ — $ — $ — $ 745,767 Special Mention — — 3,988 — — — — — 3,988 Potential Problem — — 18,002 — — — — — 18,002 PPP $ — $ — $ 767,757 $ — $ — $ — $ — $ — $ 767,757 Commercial and industrial: Risk rating: Pass $ 4,628 $ 2,177,138 $ 1,389,260 $ 1,435,519 $ 1,182,302 $ 483,957 $ 305,998 $ 453,734 $ 7,427,908 Special Mention — 10,159 2,719 39,854 37,042 113 215 67 90,169 Potential Problem 2,565 7,237 19,331 28,413 56,580 2,269 6,477 1,179 121,487 Nonaccrual 16,852 — 6,238 5,789 17,014 16,623 8,781 7,414 61,859 Commercial and industrial $ 24,045 $ 2,194,534 $ 1,417,548 $ 1,509,575 $ 1,292,938 $ 502,962 $ 321,471 $ 462,394 $ 7,701,422 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,022 $ 185,861 $ 209,069 $ 128,360 $ 99,546 $ 147,366 $ 79,111 $ 867,335 Special Mention — 113 1,882 3,122 300 658 264 — 6,339 Potential Problem — 3,486 4,104 8,916 — 1,490 4,437 3,747 26,179 Nonaccrual — — — — — 318 — 740 1,058 Commercial real estate - owner occupied $ 1,150 $ 21,621 $ 191,847 $ 221,107 $ 128,660 $ 102,012 $ 152,067 $ 83,598 $ 900,912 Commercial and business lending: Risk rating: Pass $ 5,778 $ 2,195,160 $ 2,320,888 $ 1,644,588 $ 1,310,662 $ 583,503 $ 453,364 $ 532,845 $ 9,041,009 Special Mention — 10,272 8,589 42,976 37,342 771 479 67 100,496 Potential Problem 2,565 10,723 41,437 37,329 56,580 3,759 10,915 4,926 165,668 Nonaccrual 16,852 — 6,238 5,789 17,014 16,941 8,781 8,154 62,917 Commercial and business lending $ 25,195 $ 2,216,154 $ 2,377,152 $ 1,730,682 $ 1,421,598 $ 604,974 $ 473,539 $ 545,992 $ 9,370,091 Commercial real estate - investor: Risk rating: Pass $ 10,971 $ 171,497 $ 1,249,644 $ 976,332 $ 720,237 $ 271,987 $ 341,658 $ 211,360 $ 3,942,714 Special Mention — — 90,235 97,333 12,339 — 21,882 8,465 230,254 Potential Problem — 838 16,343 13,575 30,911 2,279 239 27,209 91,396 Nonaccrual 19,803 — 10,141 53,056 446 14,267 — 309 78,220 Commercial real estate - investor $ 30,774 $ 172,335 $ 1,366,364 $ 1,140,297 $ 763,933 $ 288,533 $ 363,779 $ 247,343 $ 4,342,584 Real estate construction: Risk rating: Pass $ 776 $ 47,880 $ 645,925 $ 738,561 $ 294,910 $ 25,219 $ 2,420 $ 16,768 $ 1,771,682 Special Mention — — 487 494 48,283 42 — 30 49,336 Potential Problem — — 135 — 18,803 — 93 15 19,046 Nonaccrual — — — — — 16 — 338 353 Real estate construction $ 776 $ 47,880 $ 646,547 $ 739,055 $ 361,996 $ 25,277 $ 2,513 $ 17,150 $ 1,840,417 Commercial real estate lending: Risk rating: Pass $ 11,746 $ 219,377 $ 1,895,569 $ 1,714,893 $ 1,015,146 $ 297,205 $ 344,078 $ 228,127 $ 5,714,396 Special Mention — — 90,722 97,827 60,622 42 21,882 8,494 279,590 Potential Problem — 838 16,479 13,575 49,714 2,279 332 27,224 110,442 Nonaccrual 19,803 — 10,141 53,056 446 14,283 — 647 78,573 Commercial real estate lending $ 31,549 $ 220,215 $ 2,012,911 $ 1,879,352 $ 1,125,929 $ 313,810 $ 366,292 $ 264,493 $ 6,183,001 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 17,524 $ 2,414,537 $ 4,216,457 $ 3,359,482 $ 2,325,808 $ 880,708 $ 797,441 $ 760,973 $ 14,755,405 Special Mention — 10,272 99,311 140,803 97,964 813 22,361 8,562 380,086 Potential Problem 2,565 11,561 57,916 50,905 106,295 6,038 11,247 32,150 276,111 Nonaccrual 36,655 — 16,379 58,845 17,460 31,224 8,781 8,801 141,490 Total commercial $ 56,745 $ 2,436,370 $ 4,390,063 $ 3,610,033 $ 2,547,526 $ 918,783 $ 839,831 $ 810,485 $ 15,553,091 Residential mortgage: Risk rating: Pass $ — $ — $ 2,185,240 $ 1,490,589 $ 615,118 $ 998,072 $ 911,797 $ 1,612,971 $ 7,813,788 Special Mention — — — 355 330 102 126 537 1,450 Potential Problem — — 1,200 689 652 — 179 1,028 3,749 Nonaccrual — — 1,478 2,271 5,882 7,116 11,003 31,587 59,337 Residential mortgage $ — $ — $ 2,187,918 $ 1,493,903 $ 621,983 $ 1,005,290 $ 923,105 $ 1,646,124 $ 7,878,324 Home equity: Risk rating: Pass $ 10,224 $ 569,389 $ 2,057 $ 12,968 $ 15,792 $ 11,594 $ 5,803 $ 76,165 $ 693,767 Special Mention 596 631 — 39 14 39 4 804 1,532 Potential Problem — 1,922 — — — — — 146 2,068 Nonaccrual 1,600 100 965 134 410 319 711 7,249 9,888 Home equity $ 12,421 $ 572,041 $ 3,022 $ 13,141 $ 16,216 $ 11,952 $ 6,518 $ 84,364 $ 707,255 Other consumer: Risk rating: Pass $ 70 $ 165,114 $ 9,525 $ 10,309 $ 3,987 $ 1,872 $ 1,185 $ 120,425 $ 312,416 Special Mention 5 438 13 16 11 4 7 8 498 Nonaccrual 5 33 9 49 21 10 — 18 140 Other consumer $ 81 $ 165,585 $ 9,547 $ 10,374 $ 4,019 $ 1,886 $ 1,192 $ 120,451 $ 313,054 Total consumer: Risk rating: Pass $ 10,294 $ 734,502 $ 2,196,822 $ 1,513,865 $ 634,897 $ 1,011,539 $ 918,785 $ 1,809,561 $ 8,819,971 Special Mention 602 1,069 13 410 356 145 137 1,349 3,480 Potential Problem — 1,922 1,200 689 652 — 179 1,174 5,817 Nonaccrual 1,605 133 2,452 2,454 6,313 7,445 11,714 38,854 69,364 Total consumer $ 12,501 $ 737,626 $ 2,200,487 $ 1,517,417 $ 642,218 $ 1,019,128 $ 930,816 $ 1,850,939 $ 8,898,632 Total loans: Risk rating: Pass (c) $ 27,819 $ 3,149,039 $ 6,413,278 $ 4,873,347 $ 2,960,705 $ 1,892,247 $ 1,716,226 $ 2,570,534 $ 23,575,376 Special Mention 602 11,341 99,324 141,213 98,320 958 22,498 9,911 383,566 Potential Problem 2,565 13,483 59,116 51,593 106,947 6,038 11,426 33,324 281,928 Nonaccrual 38,260 133 18,831 61,298 23,773 38,669 20,496 47,655 210,854 Total loans $ 69,246 $ 3,173,996 $ 6,590,550 $ 5,127,451 $ 3,189,745 $ 1,937,912 $ 1,770,647 $ 2,661,424 $ 24,451,724 (a) Revolving loans converted to term loans are also reported in their year of origination. (b) The Corporation’s policy is to assign risk ratings at the borrower level. PPP loans are 100% guaranteed by the SBA and therefore the Corporation considers these loans to have a risk profile similar to pass rated loans. (c) Accruing TDRs are included in pass unless otherwise rated as special mention.
Summarized details of Loans	The following table presents loans by past due status at September 30, 2021: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 181,552 $ 485 $ 83 $ — $ — $ 182,121 Commercial and industrial 7,917,635 1,121 108 98 8,497 7,927,459 Commercial real estate - owner occupied 879,516 30 — — 7 879,554 Commercial and business lending 8,978,704 1,636 191 98 8,504 8,989,133 Commercial real estate - investor 4,217,965 17,021 — — 61,504 4,296,489 Real estate construction 1,834,623 — — — 247 1,834,871 Commercial real estate lending 6,052,588 17,021 — — 61,751 6,131,360 Total commercial 15,031,292 18,657 191 98 70,256 15,120,493 Residential mortgage 7,526,996 6,996 99 126 56,678 7,590,895 Home equity 597,776 2,428 503 21 7,838 608,566 Other consumer 292,700 724 549 785 222 294,979 Auto 6,662 10 — — 67 6,739 Total consumer 8,424,134 10,158 1,150 932 64,806 8,501,180 Total loans $ 23,455,426 $ 28,815 $ 1,341 $ 1,029 $ 135,062 $ 23,621,673 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $83 million, or 62%, were current with respect to payment at September 30, 2021. (c) No interest income was recognized on nonaccrual loans for the three and nine months ended September 30, 2021. In addition, there were $11 million of nonaccrual loans for which there was no related ACLL at September 30, 2021. The following table presents loans by past due status at December 31, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 767,757 $ — $ — $ — $ — $ 767,757 Commercial and industrial 7,633,269 2,819 3,300 175 61,859 7,701,422 Commercial real estate - owner occupied 899,480 158 215 — 1,058 900,912 Commercial and business lending 9,300,506 2,977 3,516 175 62,917 9,370,091 Commercial real estate - investor 4,251,571 1,024 11,769 — 78,220 4,342,584 Real estate construction 1,839,073 991 — — 353 1,840,417 Commercial real estate lending 6,090,644 2,015 11,769 — 78,573 6,183,001 Total commercial 15,391,150 4,992 15,284 175 141,490 15,553,091 Residential mortgage 7,808,294 8,975 1,410 308 59,337 7,878,324 Home equity 692,565 3,071 1,731 — 9,888 707,255 Other consumer 299,128 998 545 1,115 91 301,876 Auto 11,072 41 15 — 49 11,177 Total consumer 8,811,060 13,085 3,701 1,423 69,364 8,898,632 Total loans $ 24,202,209 $ 18,077 $ 18,985 $ 1,598 $ 210,854 $ 24,451,724 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $128 million, or 61%, were current with respect to payment at December 31, 2020. (c) No interest income was recognized on nonaccrual loans for the year ended December 31, 2020. In addition, there were $28 million of nonaccrual loans for which there was no related ACLL at December 31, 2020.
Nonaccrual and performing restructured loans	The following table presents nonaccrual and performing restructured loans by loan portfolio: Sep 30, 2021 Dec 31, 2020 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 11,067 $ 959 $ 12,713 $ 6,967 Commercial real estate — owner occupied 1,031 — 1,711 — Commercial real estate — investor 13,236 207 26,435 225 Real estate construction 248 107 260 111 Residential mortgage 15,253 13,235 7,825 11,509 Home equity 2,787 718 1,957 1,379 Other consumer 877 — 1,191 — Total restructured loans (b) $ 44,499 $ 15,226 $ 52,092 $ 20,190 (a) Nonaccrual restructured loans have been included within nonaccrual loans.
Summary of restructured loans	The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance for the nine months ended September 30, 2021 and 2020: Nine months ended Sep 30, 2021 Nine months ended Sep 30, 2020 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 4 $ 638 $ 638 3 $ 1,250 $ 1,324 Commercial real estate — owner occupied — — — 2 453 751 Commercial real estate — investor 4 1,682 1,682 1 530 530 Real estate construction — — — 1 102 102 Residential mortgage 55 10,434 10,460 32 5,789 5,870 Home equity 7 916 963 18 676 702 Total loans modified 70 $ 13,670 $ 13,744 57 $ 8,800 $ 9,280 (a) Represents post-modification outstanding recorded investment.
Troubled debt restructurings subsequent redefault	The following table provides the number of loans modified in a TDR during the previous twelve months which subsequently defaulted during the nine months ended September 30, 2021 and 2020, and the recorded investment in these restructured loans as of September 30, 2021 and 2020: Nine months ended Sep 30, 2021 Nine months ended Sep 30, 2020 ($ in Thousands) Number of Recorded Number of Recorded Residential mortgage 2 $ 200 5 $ 1,036 Home equity — — 4 208 Total loans modified 2 $ 200 9 $ 1,244
Changes in the allowance for loan losses by portfolio segment	The following table presents a summary of the changes in the ACLL by portfolio segment for the nine months ended September 30, 2021: ($ in Thousands) Dec 31, 2020 Charge offs Recoveries Net Charge offs Provision for credit losses Sep 30, 2021 ACLL / Loans Allowance for loan losses PPP $ 531 $ — $ — $ — $ (406) $ 125 Commercial and industrial 142,793 (13,773) 7,415 (6,358) (47,324) 89,111 Commercial real estate — owner occupied 11,274 — 115 115 634 12,022 Commercial and business lending 154,598 (13,773) 7,530 (6,242) (47,096) 101,259 Commercial real estate — investor 93,435 (14,340) 3,046 (11,293) (680) 81,461 Real estate construction 59,193 (5) 74 69 (18,298) 40,965 Commercial real estate lending 152,629 (14,344) 3,120 (11,224) (18,978) 122,426 Total commercial 307,226 (28,117) 10,650 (17,467) (66,074) 223,685 Residential mortgage 42,996 (732) 700 (32) (1,344) 41,620 Home equity 18,849 (600) 2,240 1,640 (6,172) 14,317 Other consumer 14,456 (2,331) 965 (1,366) (1,836) 11,253 Auto 174 (4) 24 20 (74) 120 Total consumer 76,475 (3,667) 3,928 262 (9,426) 67,311 Total loans $ 383,702 $ (31,784) $ 14,579 $ (17,205) $ (75,500) $ 290,997 Allowance for unfunded commitments Commercial and industrial $ 22,311 $ — $ — $ — $ (2,910) $ 19,402 Commercial real estate — owner occupied 266 — — — 43 309 Commercial and business lending 22,577 — — — (2,867) 19,711 Commercial real estate — investor 636 — — — 85 721 Real estate construction 18,887 — — — (3,411) 15,476 Commercial real estate lending 19,523 — — — (3,326) 16,197 Total commercial 42,101 — — — (6,193) 35,908 Home equity 3,118 — — — (87) 3,031 Other consumer 2,557 — — — (220) 2,337 Total consumer 5,675 — — — (307) 5,368 Total loans $ 47,776 $ — $ — $ — $ (6,500) $ 41,276 Allowance for credit losses on loans PPP $ 531 $ — $ — $ — $ (406) $ 125 0.07 % Commercial and industrial 165,105 (13,773) 7,415 (6,358) (50,233) 108,513 1.37 % Commercial real estate — owner occupied 11,539 — 115 115 677 12,331 1.40 % Commercial and business lending 177,175 (13,773) 7,530 (6,242) (49,963) 120,970 1.35 % Commercial real estate — investor 94,071 (14,340) 3,046 (11,293) (595) 82,182 1.91 % Real estate construction 78,080 (5) 74 69 (21,709) 56,441 3.08 % Commercial real estate lending 172,152 (14,344) 3,120 (11,224) (22,304) 138,623 2.26 % Total commercial 349,327 (28,117) 10,650 (17,467) (72,267) 259,593 1.72 % Residential mortgage 42,996 (732) 700 (32) (1,344) 41,620 0.55 % Home equity 21,967 (600) 2,240 1,640 (6,259) 17,348 2.85 % Other consumer 17,013 (2,331) 965 (1,366) (2,056) 13,591 4.61 % Auto 174 (4) 24 20 (74) 120 1.79 % Total consumer 82,150 (3,667) 3,928 262 (9,733) 72,679 0.85 % Total loans $ 431,478 $ (31,784) $ 14,579 $ (17,205) $ (82,000) $ 332,273 1.41 %	The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2020: ($ in Thousands) Dec 31, 2019 Cumulative effect of ASU 2016-13 adoption (CECL) Jan 1, 2020 Charge offs Recoveries Net Charge offs Gross up of allowance for PCD loans at acquisition Provision recorded at acquisition Provision for credit losses Dec 31, 2020 ACLL / Loans Allowance for loan losses PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 Commercial and industrial 91,133 52,919 144,052 (80,320) 7,004 (73,316) 293 408 71,355 142,793 Commercial real estate — owner occupied 10,284 (1,851) 8,433 (419) 147 (272) 890 255 1,967 11,274 Commercial and business lending 101,417 51,068 152,485 (80,739) 7,151 (73,588) 1,183 663 73,853 154,598 Commercial real estate — investor 40,514 2,041 42,555 (22,920) 643 (22,277) 753 472 71,933 93,435 Real estate construction 24,915 7,467 32,382 (19) 49 31 435 492 25,854 59,193 Commercial real estate lending 65,428 9,508 74,937 (22,938) 692 (22,246) 1,188 964 97,787 152,629 Total commercial 166,846 60,576 227,422 (103,677) 7,844 (95,834) 2,371 1,627 171,641 307,226 Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 Home equity 10,926 11,649 22,575 (1,719) 1,978 259 422 374 (4,781) 18,849 Other consumer (a) 6,639 7,016 13,655 (4,790) 1,101 (3,689) 61 140 4,462 14,630 Total consumer 34,525 51,880 86,405 (8,376) 3,579 (4,797) 1,134 917 (7,183) 76,475 Total loans $ 201,371 $ 112,457 $ 313,828 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,543 $ 164,457 $ 383,702 Allowance for unfunded commitments Commercial and industrial $ 12,276 $ (3,998) $ 8,278 $ — $ — $ — $ — $ 61 $ 13,972 $ 22,311 Commercial real estate — owner occupied 127 — 127 — — — — 4 135 266 Commercial and business lending 12,403 (3,998) 8,405 — — — — 65 14,108 22,577 Commercial real estate — investor 530 246 776 — — — — 2 (141) 636 Real estate construction 7,532 18,347 25,879 — — — — 45 (7,038) 18,887 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 (7,179) 19,523 Total commercial 20,465 14,595 35,060 — — — — 112 6,929 42,101 Home equity 1,038 2,591 3,629 — — — — 66 (577) 3,118 Other consumer 405 1,504 1,909 — — — — — 649 2,557 Total consumer 1,443 4,095 5,538 — — — — 66 72 5,675 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 7,000 $ 47,776 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 0.07 % Commercial and industrial 103,409 48,921 152,330 (80,320) 7,004 (73,316) 293 469 85,327 165,105 2.14 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 147 (272) 890 259 2,102 11,539 1.28 % Commercial and business lending 113,820 47,070 160,890 (80,739) 7,151 (73,588) 1,183 728 87,961 177,175 1.89 % Commercial real estate — investor 41,044 2,287 43,331 (22,920) 643 (22,277) 753 474 71,792 94,071 2.17 % Real estate construction 32,447 25,814 58,261 (19) 49 31 435 537 18,816 78,080 4.24 % Commercial real estate lending 73,490 28,101 101,591 (22,938) 692 (22,246) 1,188 1,011 90,608 172,152 2.78 % Total commercial 187,311 75,171 262,482 (103,677) 7,844 (95,834) 2,371 1,739 178,569 349,327 2.25 % Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 0.55 % Home equity 11,964 14,240 26,204 (1,719) 1,978 259 422 440 (5,358) 21,967 3.11 % Other consumer (a) 7,044 8,520 15,564 (4,790) 1,101 (3,689) 61 140 5,111 17,187 5.49 % Total consumer 35,968 55,975 91,943 (8,376) 3,579 (4,797) 1,134 983 (7,112) 82,150 0.92 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,722 $ 171,457 $ 431,478 1.76 % (a) Includes auto

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) Nine months ended Sep 30, 2021 Year Ended Dec 31, 2020 Core deposit intangibles Gross carrying amount at the beginning of period $ 88,109 $ 80,730 Additions during the period — 7,379 Accumulated amortization (27,814) (21,205) Net book value $ 60,296 $ 66,904 Amortization during the period $ 6,608 $ 8,749 Other intangibles Gross carrying amount at the beginning of period $ 2,000 $ 38,970 Additions during the period — 200 Reductions due to sale (1,317) (17,435) Accumulated amortization (683) (20,385) Net book value $ — $ 1,350 Amortization during the period $ 33 $ 1,443
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance	A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows: ($ in Thousands) Nine months ended Sep 30, 2021 Year Ended Dec 31, 2020 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 59,967 $ 67,607 Additions from acquisition — 1,357 Additions 11,761 13,667 Amortization (15,624) (22,664) Mortgage servicing rights at end of period $ 56,104 $ 59,967 Valuation allowance at beginning of period $ (18,006) $ (302) (Additions) recoveries, net 12,231 (17,704) Valuation allowance at end of period $ (5,775) $ (18,006) Mortgage servicing rights, net $ 50,329 $ 41,961 Fair value of mortgage servicing rights $ 50,373 $ 41,990 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,057,130 $ 7,743,956 Mortgage servicing rights, net to servicing portfolio 0.71 % 0.54 % Mortgage servicing rights expense (a) $ 3,393 $ 40,369
Summary of estimated future amortization expense	The following table shows the estimated future amortization expense for amortizing intangible assets: ($ in Thousands) Core Deposit Intangibles Mortgage Servicing Rights Three Months Ending December 31, 2021 $ 2,203 $ 2,945 2022 8,811 10,898 2023 8,811 8,500 2024 8,811 6,795 2025 8,811 5,499 2026 8,811 4,489 Beyond 2026 14,038 16,978 Total Estimated Amortization Expense $ 60,296 $ 56,104

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Breakdown of short & long-term debt balances	The following table presents the components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year): ($ in Thousands) Sep 30, 2021 Dec 31, 2020 Short-Term Funding Federal funds purchased $ 415 $ 7,070 Securities sold under agreements to repurchase 267,528 185,901 Federal funds purchased and securities sold under agreements to repurchase 267,943 192,971 Commercial paper 54,553 59,346 Total short-term funding $ 322,496 $ 252,317 Long-Term Funding Bank senior notes, at par, due 2021 $ — $ 300,000 Corporation subordinated notes, at par, due 2025 250,000 250,000 Finance leases 72 1,128 Capitalized costs (912) (1,663) FHLB advances 1,620,880 1,632,723 Total long-term funding 1,870,040 2,182,188 Total short and long-term funding $ 2,192,536 $ 2,434,505
Remaining contractual maturity of securities sold under agreements to repurchase	The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of September 30, 2021 and December 31, 2020 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total September 30, 2021 Repurchase agreements Agency mortgage-related securities $ 267,528 $ — $ — $ — $ 267,528 Total $ 267,528 $ — $ — $ — $ 267,528 December 31, 2020 Repurchase agreements Agency mortgage-related securities $ 185,901 $ — $ — $ — $ 185,901 Total $ 185,901 $ — $ — $ — $ 185,901

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other derivative instruments not designated as hedging instruments	The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments as of September 30, 2021 and December 31, 2020. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of September 30, 2021 and December 31, 2020. The resulting net derivative asset and liability fair values are included in other assets and accrued expenses and other liabilities, respectively, on the consolidated balance sheets. Sep 30, 2021 Dec 31, 2020 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Not designated as hedging instruments Interest rate-related instruments $ 3,889,911 $ 110,898 $ 3,889,911 $ 24,322 $ 3,639,679 $ 192,518 $ 3,639,679 $ 25,680 Foreign currency exchange forwards 496,215 4,637 483,949 4,454 411,292 4,909 398,890 4,836 Commodity contracts 16,231 6,546 16,307 6,471 87,547 12,486 83,214 11,155 Mortgage banking (a)(b) 253,663 6,159 390,000 — 226,818 9,624 335,500 2,046 Gross derivatives before netting $ 128,240 $ 35,247 $ 219,537 $ 43,716 Less: Legally enforceable master netting agreements 3,302 3,302 1,936 1,936 Less: Cash collateral pledged/received 3,143 18,595 10,879 25,625 Total derivative instruments, after netting $ 121,795 $ 13,351 $ 206,722 $ 16,155 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments.
Schedule of cash flow hedging instruments, statements of financial performance and financial position location	The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2021 and 2020: Location and Amount of Gain or (Loss) Recognized in Income on Three months ended Sep 30, Nine months ended Sep 30, 2021 2020 2021 2020 ($ in Thousands) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Interest Income Other Income (Expense) Total amounts of income and expense line items presented on the consolidated statements of income in which the effects of the fair value hedge is recorded $ (292) $ — $ (481) $ — $ (1,128) $ — $ (1,345) $ (262) The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (292) — (481) — (1,128) — (1,345) (262)
Gain (loss) on derivative instruments not designated as hedging instruments	The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2021 and 2020: Consolidated Statements of Income Category of Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ 557 $ 507 $ 2,546 $ (2,648) Foreign currency exchange forwards Capital markets, net (8) 49 109 (31) Commodity contracts Capital markets, net (124) (86) (1,256) 555 Interest rate lock commitments (mortgage) Mortgage banking, net (1,356) (4,948) (4,438) 5,361 Forward commitments (mortgage) Mortgage banking, net (1,402) 1,293 (3,017) 710

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2021
Offsetting [Abstract]
Balance sheet offsetting of derivative assets and liabilities	The following table presents the interest rate, commodity, and foreign exchange assets and liabilities subject to an enforceable master netting arrangement. The interest, commodity and foreign exchange agreements the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement and are therefore excluded from this table: Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Received Derivative assets September 30, 2021 $ 6,719 $ (3,302) $ (3,143) $ 273 December 31, 2020 13,441 (1,936) (10,879) 626 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Pledged Derivative liabilities September 30, 2021 $ 23,489 $ (3,302) $ (18,595) $ 1,592 December 31, 2020 27,951 (1,936) (25,625) 390

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: ($ in Thousands) Sep 30, 2021 Dec 31, 2020 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 10,618,161 $ 10,010,492 Commercial letters of credit (a) 6,309 3,642 Standby letters of credit (c) 264,123 278,798 (a) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no
Schedule Of Unfunded Commitments [Table Text Block]	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Nine months ended Sep 30, 2021 Year Ended Dec 31, 2020 Allowance for Unfunded Commitments Balance at beginning of period $ 47,776 $ 21,907 Cumulative effect of ASU 2016-13 adoption (CECL) N/A 18,690 Balance at beginning of period, adjusted 47,776 40,597 Provision for unfunded commitments (6,500) 7,000 Amount recorded at acquisition N/A 179 Balance at end of period $ 41,276 $ 47,776

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Assets and liabilities measured on recurring basis at fair value	The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy Sep 30, 2021 Dec 31, 2020 Assets Investment securities AFS U.S. Treasury securities Level 1 $ 123,981 $ 26,531 Agency securities Level 2 14,998 25,038 Obligations of state and political subdivisions (municipal securities) Level 2 414,020 450,662 Residential mortgage-related securities FNMA / FHLMC Level 2 2,377,408 1,461,241 GNMA Level 2 79,696 235,537 Private-label Level 2 76,033 — Commercial mortgage-related securities FNMA / FHLMC Level 2 353,175 22,904 GNMA Level 2 231,096 524,756 Asset backed securities FFELP Level 2 212,797 327,189 SBA Level 2 7,179 8,584 Other debt securities Level 2 2,999 3,000 Total investment securities AFS Level 1 $ 123,981 $ 26,531 Total investment securities AFS Level 2 3,769,399 3,058,910 Equity securities with readily determinable fair values Level 1 4,109 1,661 Residential loans held for sale Level 2 158,202 129,158 Interest rate-related instruments (a) Level 2 110,898 192,518 Foreign currency exchange forwards (a) Level 2 4,637 4,909 Commodity contracts (a) Level 2 6,546 12,486 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 5,187 9,624 Forward commitments to sell residential mortgage loans Level 3 972 — Liabilities Interest rate-related instruments (a) Level 2 $ 24,322 $ 25,680 Foreign currency exchange forwards (a) Level 2 4,454 4,836 Commodity contracts (a) Level 2 6,471 11,155 Forward commitments to sell residential mortgage loans Level 3 — 2,046
Assets and liabilities measured at fair value using significant unobservable inputs (level 3)	The table below presents a rollforward of the consolidated balance sheets amounts for the nine months ended September 30, 2021 and the year ended December 31, 2020, for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ in Thousands) Interest rate lock commitments to originate residential mortgage loans held for sale Forward commitments to sell residential mortgage loans Total Balance December 31, 2019 $ 2,527 $ 710 $ 1,817 New production 72,659 (3,505) 76,164 Closed loans / settlements (76,001) (12,587) (63,414) Other 10,439 17,427 (6,988) Mortgage derivative gain (loss) 7,097 1,335 5,762 Balance December 31, 2020 $ 9,624 $ 2,046 $ 7,579 New production $ 45,586 $ (2,496) $ 48,082 Closed loans / settlements (44,543) 217 (44,760) Other (5,481) (739) (4,742) Mortgage derivative gain (loss) (4,437) (3,017) (1,420) Balance September 30, 2021 $ 5,187 $ (972) $ 6,159
Equity securities without readily determinable fair value	The following table presents the carrying value of equity securities without readily determinable fair values still held as of September 30, 2021 that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of September 30, 2021: ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2020 $ 13,444 Additions 552 Sales (33) Donations (134) Carrying value as of September 30, 2021 $ 13,830 Cumulative upward carrying value changes between January 1, 2018 and September 30, 2021 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2021 $ —
Assets and liabilities measured on nonrecurring basis at fair value	The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall: Consolidated Statements of Income ($ in Thousands) Fair Value Hierarchy Fair Value Adjustment Recognized on the Consolidated Statements of Income (c) September 30, 2021 Assets Individually evaluated loans (a) Level 3 $ 78,139 Provision for credit losses $ (4,227) OREO (b) Level 2 21,847 Other noninterest expense / provision for credit losses (d) 6,449 Mortgage servicing rights Level 3 50,373 Mortgage banking, net 12,231 December 31, 2020 Assets Individually evaluated loans (a) Level 3 $ 138,752 Provision for credit losses $ 97,519 OREO (b) Level 2 6,125 Other noninterest expense 3,747 Mortgage servicing rights Level 3 41,990 Mortgage banking, net (17,704) (a) Includes probable TDRs which are individually analyzed, net of the related allowance for credit losses.
Schedule of assumptions for fair value as of balance sheet date of assets or liabilities that relate to transferor's continuing involvement	The table below presents information about these inputs and further discussion is found above: September 30, 2021 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Discount rate 9% - 15% 9% Mortgage servicing rights Discounted cash flow Constant prepayment rate 8% - 40% 15% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 33% - 51% 36%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: Sep 30, 2021 Dec 31, 2020 ($ in Thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 378,927 $ 378,927 $ 416,154 $ 416,154 Interest-bearing deposits in other financial institutions Level 1 1,281,916 1,281,916 298,759 298,759 Federal funds sold and securities purchased under agreements to resell Level 1 25,000 25,000 1,135 1,135 Investment securities AFS Level 1 123,981 123,981 26,531 26,531 Investment securities AFS Level 2 3,769,399 3,769,399 3,058,910 3,058,910 Investment securities HTM, net Level 1 1,000 1,007 999 1,024 Investment securities HTM, net Level 2 1,928,735 2,034,803 1,877,939 2,027,852 Equity securities with readily determinable fair values Level 1 4,109 4,109 1,661 1,661 Equity securities without readily determinable fair values Level 3 13,830 13,830 13,444 13,444 FHLB and Federal Reserve Bank stocks Level 2 168,281 168,281 168,280 168,280 Residential loans held for sale Level 2 158,202 158,202 129,158 129,158 Loans, net Level 3 23,330,676 23,447,728 24,068,022 24,012,738 Bank and corporate owned life insurance Level 2 683,610 683,610 679,647 679,647 Derivatives (other assets) (a) Level 2 122,082 122,082 209,913 209,913 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 5,187 5,187 9,624 9,624 Forward commitments to sell residential mortgage loans (other assets) Level 3 972 972 — — Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 26,440,380 $ 26,440,380 $ 24,725,451 $ 24,725,451 Brokered CDs and other time deposits (b) Level 2 1,410,886 1,412,950 1,757,030 1,766,200 Short-term funding Level 2 322,496 322,486 252,317 252,303 FHLB advances Level 2 1,620,880 1,701,512 1,632,723 1,760,727 Other long-term funding Level 2 249,160 270,526 549,465 578,233 Standby letters of credit (c) Level 2 2,549 2,549 2,731 2,731 Derivatives (accrued expenses and other liabilities) (a) Level 2 35,247 35,247 41,671 41,671 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 — — 2,046 2,046 (a) Figures are presented gross before netting. See Note 10 and Note 11 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Net period benefit cost for the pension and postretirement plans	The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Components of Net Periodic Benefit Cost RAP Service cost $ 1,684 $ 1,853 $ 5,835 $ 6,183 Interest cost 1,682 2,124 4,927 6,139 Expected return on plan assets (6,395) (6,386) (19,256) (19,196) Amortization of prior service cost (19) (18) (55) (55) Amortization of actuarial loss (gain) 1,346 1,313 3,446 2,923 Total net periodic pension cost $ (1,701) $ (1,114) $ (5,103) $ (4,006) Postretirement Plan Interest cost $ 13 $ 20 $ 39 $ 59 Amortization of prior service cost (19) (19) (56) (56) Total net periodic benefit cost $ (6) $ 1 $ (17) $ 2

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 93,768 $ 92,033 $ 280,295 $ 298,611 Net intersegment interest income (expense) 5,884 6,937 18,962 3,123 Segment net interest income 99,652 98,970 299,257 301,734 Noninterest income (a) 43,228 37,405 124,847 111,254 Total revenue 142,881 136,376 424,104 412,987 Provision for credit losses 14,864 15,572 48,803 41,456 Noninterest expense 58,652 52,635 172,781 160,899 Income (loss) before income taxes 69,364 68,169 202,521 210,633 Income tax expense (benefit) 12,617 12,497 37,213 39,161 Net income $ 56,747 $ 55,672 $ 165,307 $ 171,472 Allocated goodwill $ 525,836 $ 530,144 Community, Consumer, and Business Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 70,860 $ 73,644 $ 209,285 $ 221,691 Net intersegment interest income (expense) 12,907 9,231 39,705 42,213 Segment net interest income 83,767 82,875 248,990 263,904 Noninterest income 35,771 32,958 113,558 140,442 Total revenue 119,538 115,833 362,548 404,345 Provision for credit losses 4,233 5,758 13,897 16,296 Noninterest expense 94,762 102,139 290,443 335,675 Income (loss) before income taxes 20,543 7,936 58,209 52,374 Income tax expense (benefit) 4,314 1,667 12,224 10,999 Net income $ 16,230 $ 6,269 $ 45,985 $ 41,376 Allocated goodwill $ 579,156 $ 577,758 Risk Management and Shared Services Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 19,047 $ 16,472 $ 49,511 $ 54,662 Net intersegment interest income (expense) (18,791) (16,167) (58,666) (45,336) Segment net interest income 256 305 (9,155) 9,326 Noninterest income (b) 3,077 5,182 12,457 176,646 Total revenue 3,333 5,487 3,301 185,973 Provision for credit losses (43,107) 21,679 (144,717) 99,257 Noninterest expense 24,478 72,813 64,490 106,610 Income (loss) before income taxes 21,962 (89,005) 83,529 (19,895) Income tax expense (benefit) 6,129 (72,278) 20,705 (46,817) Net income $ 15,833 $ (16,727) $ 62,824 $ 26,922 Allocated goodwill $ — $ — Consolidated Total Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Net interest income $ 183,675 $ 182,150 $ 539,092 $ 574,964 Net intersegment interest income (expense) — — — — Segment net interest income 183,675 182,150 539,092 574,964 Noninterest income (a)(b) 82,076 75,545 250,862 428,342 Total revenue 265,752 257,695 789,954 1,003,305 Provision for credit losses (24,010) 43,009 (82,018) 157,009 Noninterest expense 177,892 227,587 527,713 603,184 Income (loss) before income taxes 111,870 (12,900) 344,259 243,112 Income tax expense (benefit) 23,060 (58,114) 70,142 3,342 Net income $ 88,809 $ 45,214 $ 274,117 $ 239,769 Allocated goodwill $ 1,104,992 $ 1,107,902

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Summary of activity in accumulated other comprehensive income (loss)	The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2021 and 2020, including changes during the preceding three and nine month periods as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Defined Benefit Accumulated Balance December 31, 2020 $ 41,325 $ (28,707) $ 12,618 Other comprehensive income (loss) before reclassifications (35,829) — (35,829) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net 16 — 16 Personnel expense — (111) (111) Other expense — 3,446 3,446 Interest income 1,335 — 1,335 Income tax (expense) benefit 8,548 (836) 7,712 Net other comprehensive income (loss) during period (25,930) 2,498 (23,431) Balance September 30, 2021 $ 15,395 $ (26,209) $ (10,813) Balance December 31, 2019 $ 3,989 $ (37,172) $ (33,183) Other comprehensive income (loss) before reclassifications 53,900 — 53,900 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (9,222) — (9,222) Personnel expense — (111) (111) Other expense — 2,923 2,923 Interest income 2,628 — 2,628 Income tax (expense) benefit (11,852) (1,088) (12,939) Net other comprehensive income (loss) during period 35,454 1,724 37,178 Balance September 30, 2020 $ 39,443 $ (35,448) $ 3,995 ($ in Thousands) Investments Defined Benefit Accumulated Balance June 30, 2021 $ 30,076 $ (27,187) $ 2,889 Other comprehensive income (loss) before reclassifications (19,827) — (19,827) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net — — — Personnel expense — (37) (37) Other expense — 1,346 1,346 Interest income 172 — 172 Income tax (expense) benefit 4,975 (330) 4,644 Net other comprehensive income (loss) during period (14,681) 979 (13,702) Balance September 30, 2021 $ 15,395 $ (26,209) $ (10,813) Balance June 30, 2020 $ 34,101 $ (36,021) $ (1,920) Other comprehensive income (loss) before reclassifications 5,840 — 5,840 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (7) — (7) Personnel expense — (36) (36) Other expense — 1,313 1,313 Interest income 1,296 — 1,296 Income tax (expense) benefit (1,786) (703) (2,489) Net other comprehensive income (loss) during period 5,342 573 5,916 Balance September 30, 2020 $ 39,443 $ (35,448) $ 3,995

Revenue from Contract with Cust

Revenue from Contract with Customer (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of revenue by Major source	The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Wealth management fees $ 22,110 $ 21,152 $ 67,229 $ 61,496 Service charges and deposit account fees 4,539 4,458 13,898 12,316 Card-based fees (a) 541 474 1,367 1,216 Insurance commissions and fees 36 57 98 179 Other revenue 772 1,400 2,619 2,481 Noninterest income (in-scope of Topic 606) $ 27,998 $ 27,540 $ 85,212 $ 77,690 Noninterest income (out-of-scope of Topic 606) (b) 15,230 9,866 39,635 33,564 Total noninterest income $ 43,228 $ 37,405 $ 124,847 $ 111,254 Community, Consumer, and Business Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Wealth management fees $ — $ — $ — $ 1,387 Service charges and deposit account fees 12,417 9,816 33,441 28,653 Card-based fees (a) 10,600 9,699 30,538 27,392 Insurance commissions and fees 50 55 146 44,965 Other revenue 1,945 2,168 7,459 7,315 Noninterest income (in-scope of Topic 606) $ 25,012 $ 21,739 $ 71,583 $ 109,713 Noninterest income (out-of-scope of Topic 606) 10,758 11,219 41,976 30,728 Total noninterest income $ 35,771 $ 32,958 $ 113,558 $ 140,442 Risk Management and Shared Services Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Service charges and deposit account fees $ 5 $ 10 $ 27 $ 19 Card-based fees (a) 6 34 15 127 Insurance commissions and fees 2 2 6 8 Other revenue 76 (82) 1,540 (33) Noninterest income (in-scope of Topic 606) $ 89 $ (36) $ 1,588 $ 121 Noninterest income (out-of-scope of Topic 606) (c) 2,989 5,218 10,868 176,525 Total noninterest income $ 3,077 $ 5,182 $ 12,457 $ 176,646 Consolidated Total Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Wealth management fees $ 22,110 $ 21,152 $ 67,229 $ 62,884 Service charges and deposit account fees 16,962 14,283 47,366 40,989 Card-based fees (a) 11,147 10,207 31,920 28,736 Insurance commissions and fees 88 114 250 45,153 Other revenue 2,792 3,487 11,618 9,764 Noninterest income (in-scope of Topic 606) $ 53,099 $ 49,243 $ 158,383 $ 187,524 Noninterest income (out-of-scope of Topic 606) (b)(c) 28,977 26,303 92,479 240,818 Total noninterest income $ 82,076 $ 75,545 $ 250,862 $ 428,342 (a) Certain card-based fees are out-of-scope of Topic 606. (b) For the nine months ended September 30, 2021, the Corporation recognized a $2 million pre-tax gain on the sale of Whitnell. (c) For the nine months ended September 30, 2020, the Corporation recognized a $163 million pre-tax gain on the sale of ABRC.
Revenue recognition 606	Below is a listing of performance obligations for the Corporation's main revenue streams: Revenue Stream Noninterest income in-scope of Topic 606 Service charges and deposit account fees Service charges and deposit account fees consist of monthly service fees (i.e. business analyzed fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges and deposit account fees is primarily received immediately or in the following month through a direct charge to customers’ accounts. Card-based fees (a) Card-based fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month. Trust and asset management fees (b) Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to the customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and advisory fees (b) Brokerage and advisory fees primarily consist of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage and advisory fees are included in wealth management fees.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Lease, Cost and Cash Flows	Operating and finance lease costs and cash flows resulting from these leases are presented below: Three Months Ended Sep 30, Nine Months Ended Sep 30, ($ in Thousands) 2021 2020 2021 2020 Operating lease costs $ 2,367 $ 3,970 $ 6,850 $ 9,224 Finance lease costs 17 39 76 115 Operating lease cash flows 2,858 2,871 8,598 8,303 Finance lease cash flows 21 40 101 82
Components of lease expense	The lease classifications on the consolidated balance sheets were as follows: ($ in Thousands) Consolidated Balance Sheets Category Sep 30, 2021 Dec 31, 2020 Operating lease right-of-use asset Premises and equipment $ 29,527 $ 31,994 Finance lease right-of-use asset Other assets 59 962 Operating lease liability Accrued expenses and other liabilities 33,066 36,425 Finance lease liability Other long-term funding 72 1,128
Operating lease information	The lease payment obligations, weighted-average remaining lease term, and weighted-average original discount rate were as follows: Sep 30, 2021 Dec 31, 2020 ($ in Thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment $ 192 1.74 0.46 % $ 386 2.49 0.46 % Retail and corporate offices 30,756 5.55 3.24 % 34,036 6.04 3.33 % Land 5,747 8.48 3.11 % 6,385 8.99 3.09 % Total operating leases $ 36,696 5.97 3.21 % $ 40,806 6.45 3.27 % Finance leases Land $ 73 0.92 1.07 % $ 1,145 1.65 1.05 % Total finance leases $ 73 0.92 1.07 % $ 1,145 1.65 1.05 %
Amortization of operating lease liabilities	Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Three Months Ending December 31, 2021 $ 2,326 $ 21 $ 2,348 2022 8,061 51 8,112 2023 6,108 — 6,108 2024 5,317 — 5,317 2025 4,076 — 4,076 Beyond 2025 10,807 — 10,807 Total lease payments $ 36,696 $ 73 $ 36,768 Less: interest 3,630 — 3,630 Present value of lease payments $ 33,066 $ 72 $ 33,138

Acquisitions Staunton Acquisiti

Acquisitions Staunton Acquisition (Details) - USD ($) $ in Thousands	Feb. 14, 2020	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020
February 14, 2020
Fair value of liabilities assumed			$ 0	$ 480,028
First Staunton Bancshares [Member]
Purchase Accounting Adjustments
Cash and cash equivalents	$ 0
Investment securities AFS	(24)
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	0
Loans	(4,808)
Premises and equipment, net	(3,005)
Bank owned life insurance	9
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	7,379
OREO (included in other assets on the face of the consolidated balance sheets)	670
Other assets	2,795
Deposits	1,285
Other borrowings	61
Accrued expenses and other liabilities	179
February 14, 2020
Cash and cash equivalents	44,782
Investment securities AFS	98,743
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	781
Loans	369,741
Premises and equipment, net	4,865
Bank owned life insurance	6,770
Goodwill	14,812	$ 15,000
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	7,379
OREO (included in other assets on the face of the consolidated balance sheets)	762
Other assets	7,692
Total assets	556,328
Deposits	438,684
Other borrowings	34,613
Accrued expenses and other liabilities	6,730
Fair value of liabilities assumed	480,028
Total consideration paid	$ 76,300

Acquisitions, PCD Loans (Detail

Acquisitions, PCD Loans (Details) $ in Thousands	Feb. 14, 2020USD ($)
Business Combinations [Abstract]
Purchase price of loans at acquisition	$ 77,221
Allowance for credit losses at acquisition	3,504
Non-credit discount/(premium) at acquisition	(951)
Par value of acquired loans at acquisition	$ 79,774

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Thousands	Dec. 11, 2020USD ($)branch	Sep. 12, 2020branch	Jun. 30, 2020USD ($)	Feb. 14, 2020USD ($)branch	Mar. 31, 2021USD ($)	Sep. 30, 2021USD ($)	Mar. 01, 2021USD ($)	Feb. 26, 2021USD ($)	Dec. 31, 2020USD ($)	Jun. 14, 2019branch
Business Acquisition [Line Items]
Deposits						$ 27,851,266		$ 31,000	$ 26,482,481
Huntington National Bank
Business Acquisition [Line Items]
Business Combination, Control Obtained Description	4% purchase premium on deposits transferred	4% purchase premium on deposits
New Communities | branch										10
First Staunton Bancshares [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition				Feb. 14, 2020
Business Acquisition, Name of Acquired Entity				First Staunton
Business Combination, Control Obtained Description				The purchase price was based on an assumed 4% deposit premium at announcement.
New Communities | branch				9
Acquired Net Branches | branch				7
Goodwill				$ 14,812	$ 15,000
PCD - HTM Securities				0
PCD - AFS Securities				0
Total consideration paid				$ 76,300
ABRC
Business Acquisition [Line Items]
Total consideration paid			$ 266,000
Pre-tax book gain on sale			$ 163,000
Peoria, IL [Member]
Business Acquisition [Line Items]
Disposed Net Branches | branch		5
Deposits	$ 180,000
Southwest Wisconsin [Member]
Business Acquisition [Line Items]
Disposed Net Branches | branch	2
Deposits	$ 53,000
Whitnell
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Consideration							$ 8,000
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax					$ 2,000	$ 2,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Calculations for basic and diluted earnings per common share
Net income	$ 88,809	$ 91,007	$ 94,301	$ 45,214	$ 148,718	$ 45,838	$ 274,117	$ 239,769
Preferred stock dividends	(4,155)			(5,207)			(14,236)	(13,152)
Net income available to common equity	84,655			40,007			259,880	226,618
Common shareholder dividends	(30,323)			(27,676)			(85,604)	(83,607)
Unvested share-based payment awards	(222)			(199)			(634)	(549)
Undistributed earnings	54,109			12,133			173,642	142,462
Undistributed earnings allocated to common shareholders	53,716			12,045			172,436	141,426
Undistributed earnings allocated to unvested share-based payment awards	393			87			1,206	1,036
Undistributed earnings	54,109			12,133			173,642	142,462
Basic
Distributed earnings to common shareholders	30,323			27,676			85,604	83,607
Undistributed earnings allocated to common shareholders	53,716			12,045			172,436	141,426
Total common shareholders earnings, basic	84,039			39,721			258,040	225,032
Diluted
Distributed earnings to common shareholders	30,323			27,676			85,604	83,607
Undistributed earnings allocated to common shareholders	53,716			12,045			172,436	141,426
Total common shareholders earnings, diluted	$ 84,039			$ 39,721			$ 258,040	$ 225,032
Weighted average common shares outstanding	150,046			152,440			151,473	153,175
Effect of dilutive common stock awards	1,096			754			1,228	739
Diluted weighted average common shares outstanding	151,143			153,194			152,701	153,914
Basic earnings per common share	$ 0.56			$ 0.26			$ 1.70	$ 1.47
Diluted earnings per common share	$ 0.56			$ 0.26			$ 1.69	$ 1.46

Earnings Per Common Share (De_2

Earnings Per Common Share (Details Textuals) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Approximate anti-dilutive stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3	8	3	7

Stock-Based Compensation Fair V

Stock-Based Compensation Fair Value Assumptions of Stock Options (Details)	9 Months Ended
	Sep. 30, 2020$ / shares
Retirement Benefits [Abstract]
Dividend yield	3.50%
Risk-free interest rate	1.60%
Weighted average expected volatility	21.00%
Weighted average expected life	5 years 9 months
Weighted average per share fair value of options	$ 2.39

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	9 Months Ended
	Jun. 30, 2021	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	6,473	6,473
Exercised		1,116
Forfeited or expired		97
Stock Options Shares Outstanding, Ending balance (in shares)		5,260
Options exercisable (in shares)		3,694
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Option Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 19.77	$ 19.77
Exercised		16.36
Forfeited		22.61
Stock Option Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)		20.44
Options Exercisable, Weighted Average Exercise Price (in usd per share)		$ 20.58
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 2 months 23 days	6 years 3 days
Options exercisable, Weighted Average Remaining Contractual Term		5 years 2 months 8 days
Stock Options Outstanding, Aggregate Intrinsic Value, Beginning balance	$ 2,005	$ 2,005
Stock Options Outstanding, Aggregate Intrinsic Value, Ending balance		11,044
Options exercisable, Aggregate Intrinsic Value		$ 8,062

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Beginning balance (in shares) | shares	2,293
Granted | shares	1,212
Vested | shares	797
Forfeited | shares	52
Outstanding Shares, Ending balance (in shares) | shares	2,656
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance (in usd per share) | $ / shares	$ 20.70
Granted, Weighted Average Grant Date Fair Value | $ / shares	20
Vested, Weighted Average Grant Date Fair Value | $ / shares	21.23
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	22.39
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 19.86

Stock-Based Compensation (Detai

Stock-Based Compensation (Details Textuals) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Intrinsic value of stock options exercised	$ 6,000	$ 1,000
Total fair value of vested stock options	$ 3,000	4,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting	$ 1,000	$ 3,000
Recognized compensation expense for accelerated vesting	65
Unvested share-based payment awards	$ 2,000
Remaining requisite service periods, extend through	first quarter of 2024
Performance-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Service-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years	4 years
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting	$ 11,000	$ 15,000
Recognized compensation expense for accelerated vesting	2,000
Unvested share-based payment awards	$ 24,000
Remaining requisite service periods, extend through	first quarter of 2025

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	$ 3,872,150	$ 3,028,399
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	38,106	60,612
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(16,877)	(3,570)
Available-for-sale Securities	3,893,379	3,085,441
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,929,783	1,879,005
Held-to-maturity, Gross Unrealized Gains	114,095	149,938
Held-to-maturity, Gross Unrealized Loss	(8,019)	0
Held-to-maturity, Fair Value	2,035,858	2,028,943
Fair Value, Inputs, Level 2
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	3,769,399	3,058,910
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,928,735	1,877,939
Held-to-maturity, Fair Value	2,034,803	2,027,852
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other Debt securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	2,999	3,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	7,179	8,584
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	212,797	327,189
Fair Value, Inputs, Level 1
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	123,981	26,531
Private-label Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	76,033	0
FNMA/FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	2,377,408	1,461,241
FNMA/FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	353,175	22,904
Government National Mortgage Association (GNMA) [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	79,696	235,537
Government National Mortgage Association (GNMA) [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	231,096	524,756
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	124,253	26,436
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	46	95
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(319)	0
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Held-to-maturity, Gross Unrealized Gains	7	25
Held-to-maturity, Gross Unrealized Loss	0	0
Held-to-maturity, Fair Value	1,007	1,024
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities		26,531
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	123,981	26,531
Agency Securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	15,000	24,985
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	53
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	0
Agency Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	14,998	25,038
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	394,310	425,057
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	19,709	25,605
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,541,443	1,441,900
Held-to-maturity, Gross Unrealized Gains	106,181	133,544
Held-to-maturity, Gross Unrealized Loss	(3,996)	0
Held-to-maturity, Fair Value	1,643,628	1,575,445
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities	414,020	450,662
Residential Related Securities | Private-label Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	76,033
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
Available-for-sale Securities	76,033
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Held-to-maturity, Fair Value	0
Residential Related Securities | FNMA/FHLMC
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	2,377,335	1,448,806
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	9,216	12,935
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(9,144)	(500)
Available-for-sale Securities	2,377,408
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	37,318	54,599
Held-to-maturity, Gross Unrealized Gains	2,129	2,891
Held-to-maturity, Gross Unrealized Loss	0	0
Held-to-maturity, Fair Value	39,447	57,490
Residential Related Securities | Government National Mortgage Association (GNMA) [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	77,199	231,364
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,497	4,176
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	(3)
Available-for-sale Securities	79,696
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	54,900	114,553
Held-to-maturity, Gross Unrealized Gains	2,328	4,260
Held-to-maturity, Gross Unrealized Loss	0	0
Held-to-maturity, Fair Value	57,228	118,813
Commercial mortgage-related securities | FNMA/FHLMC
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	357,837	19,654
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,230	3,250
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(6,892)	0
Available-for-sale Securities	353,175
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	170,739	11,211
Held-to-maturity, Gross Unrealized Gains	248	0
Held-to-maturity, Gross Unrealized Loss	(4,002)	0
Held-to-maturity, Fair Value	166,985	11,211
Commercial mortgage-related securities | Government National Mortgage Association (GNMA) [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	227,622	511,429
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	3,474	13,327
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	231,096
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	124,383	255,742
Held-to-maturity, Gross Unrealized Gains	3,202	9,218
Held-to-maturity, Gross Unrealized Loss	(22)	0
Held-to-maturity, Fair Value	127,562	264,960
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	212,378	329,030
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	890	1,172
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(471)	(3,013)
Available-for-sale Securities	212,797
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Held-to-maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	7,182	8,637
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	44	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(48)	(53)
Available-for-sale Securities	7,179
Investment securities HTM
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Held-to-maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities		8,584
Other Debt securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale Securities, Amortized Cost Basis, Total	3,000	3,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ (1)	$ 0

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Available for Sale, Due in one year or less	$ 7,987
Available for Sale, Due after one year through five years	75,545
Available for Sale, Due after five years through ten years	415,467
Available for Sale, Due after ten years	37,565
Available for Sale, Total debt securities	536,564
Available for Sale, amortized cost	3,872,150	$ 3,028,399
Fair Value
Available for Sale, Due in one year or less	7,996
Available for Sale, Due after one year through five years	75,970
Available for Sale, Due after five years through ten years	430,634
Available for Sale, Due after ten years	41,396
Available for Sale, Total debt securities	555,997
Investment securities AFS, at fair value	$ 3,893,379	3,085,441
Available for Sale, Ratio of Fair Value to Amortized Cost	100.50%
Amortized Cost
Held to Maturity, Due in one year or less	$ 27,797
Held to Maturity, Due after one year through five years	39,029
Held to Maturity, Due after five years through ten years	181,911
Held to Maturity, Due after ten years	1,293,705
Held to Maturity, Total Debt Securities	1,542,442
Held to Maturity, Amortized Cost	1,929,783	1,879,005
Fair Value
Held to Maturity, Due in one year or less	27,982
Held to Maturity, Due after one year through five years	40,265
Held to Maturity, Due after five years through ten years	189,290
Held to Maturity, Due after ten years	1,387,099
Held to Maturity, Securities, Debt Securities	1,644,635
Held to Maturity, Total debt securities at fair value	$ 2,035,858	2,028,943
Held to Maturity, Ratio of Fair Value to Amortized Cost	105.50%
Residential Related Securities | Private-label Securities [Member]
Amortized Cost
Available for Sale, amortized cost	$ 76,033
Fair Value
Investment securities AFS, at fair value	76,033
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
Residential Related Securities | FNMA/FHLMC
Amortized Cost
Available for Sale, amortized cost	2,377,335	1,448,806
Fair Value
Investment securities AFS, at fair value	2,377,408
Amortized Cost
Held to Maturity, Amortized Cost	37,318	54,599
Fair Value
Held to Maturity, Total debt securities at fair value	39,447	57,490
Residential Related Securities | Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Available for Sale, amortized cost	77,199	231,364
Fair Value
Investment securities AFS, at fair value	79,696
Amortized Cost
Held to Maturity, Amortized Cost	54,900	114,553
Fair Value
Held to Maturity, Total debt securities at fair value	57,228	118,813
Commercial mortgage-related securities | FNMA/FHLMC
Amortized Cost
Available for Sale, amortized cost	357,837	19,654
Fair Value
Investment securities AFS, at fair value	353,175
Amortized Cost
Held to Maturity, Amortized Cost	170,739	11,211
Fair Value
Held to Maturity, Total debt securities at fair value	166,985	11,211
Commercial mortgage-related securities | Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Available for Sale, amortized cost	227,622	511,429
Fair Value
Investment securities AFS, at fair value	231,096
Amortized Cost
Held to Maturity, Amortized Cost	124,383	255,742
Fair Value
Held to Maturity, Total debt securities at fair value	127,562	264,960
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, amortized cost	212,378	329,030
Fair Value
Investment securities AFS, at fair value	212,797
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Available for Sale, amortized cost	7,182	$ 8,637
Fair Value
Investment securities AFS, at fair value	7,179
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	$ 0

Investment Securities, HTM Cred

Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 1,929,783	$ 1,879,005
Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	194
US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
US Treasury Securities | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,541,443	1,441,900
US States and Political Subdivisions Debt Securities [Member] | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	194
FNMA/FHLMC | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	37,318	54,599
FNMA/FHLMC | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	170,739	11,211
FNMA/FHLMC | Not Rated [Domain] | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
FNMA/FHLMC | Not Rated [Domain] | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	54,900	114,553
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	124,383	255,742
Government National Mortgage Association (GNMA) [Member] | Not Rated [Domain] | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Government National Mortgage Association (GNMA) [Member] | Not Rated [Domain] | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,071,438	1,004,357
AAA | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
AAA | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	683,098	567,252
AAA | FNMA/FHLMC | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	37,318	54,599
AAA | FNMA/FHLMC | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	170,739	11,211
AAA | Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	54,900	114,553
AAA | Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	124,383	255,742
AA
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	847,641	860,607
AA | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
AA | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	847,641	860,607
AA | FNMA/FHLMC | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
AA | FNMA/FHLMC | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
AA | Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
AA | Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
A
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	10,511	14,041
A | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
A | US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	10,511	14,041
A | FNMA/FHLMC | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
A | FNMA/FHLMC | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
A | Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	0
A | Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 0	$ 0

Investment Securities Gain_Loss

Investment Securities Gain/Loss Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Gross gains on AFS securities	$ 0		$ 7	$ 421	$ 9,312
Gross (losses) on AFS securities	0		0	(437)	(90)
Investment securities gains (losses), net	0		7	(16)	9,222
Proceeds from sales of investment securities	$ 0	$ 51,000	$ 8	$ 158,708	$ 626,283

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (16,482)	$ (685)
Unrealized losses on available for sale securities, 12 months or more	(395)	(2,885)
Total unrealized losses on available for sale securities	(16,877)	(3,570)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,706,729	371,400
Fair value of unrealized losses on available for sale securities, less than 12 months	1,637,498	192,720
Fair value of unrealized losses on available for sale securities, 12 months or more	69,231	178,681
Total fair value of unrealized losses on available for sale securities	$ 1,706,729	$ 371,400
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	60	27
Available for sale, number of securities, 12 months or more | security	17	16
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (8,019)	$ 0
Unrealized losses on held to maturity securities, 12 months or more	0	0
Total unrealized losses on held to maturity securities	$ (8,019)	$ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	0	0
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 313,096	$ 325
Fair value of unrealized losses on held to maturity securities, 12 months or more	0	0
Total fair value of unrealized losses on held to maturity securities	$ 313,096	$ 325
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	74	1
US Treasury Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (319)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(319)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	84,071
Fair value of unrealized losses on available for sale securities, less than 12 months	84,071
Fair value of unrealized losses on available for sale securities, 12 months or more	0
Total fair value of unrealized losses on available for sale securities	$ 84,071
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	4
Available for sale, number of securities, 12 months or more | security	0
Agency Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (2)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,998
Fair value of unrealized losses on available for sale securities, less than 12 months	14,998
Fair value of unrealized losses on available for sale securities, 12 months or more	0
Total fair value of unrealized losses on available for sale securities	$ 14,998
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1
Available for sale, number of securities, 12 months or more | security	0
US States and Political Subdivisions Debt Securities [Member]
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (3,996)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(3,996)
Fair value of unrealized losses on held to maturity securities, less than 12 months	151,216
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 151,216
US States and Political Subdivisions Debt Securities [Member] | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	62
US States and Political Subdivisions Debt Securities [Member] | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (124)	$ (129)
Unrealized losses on available for sale securities, 12 months or more	(347)	(2,885)
Total unrealized losses on available for sale securities	(471)	(3,013)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	99,878	187,948
Fair value of unrealized losses on available for sale securities, less than 12 months	34,876	9,267
Fair value of unrealized losses on available for sale securities, 12 months or more	65,002	178,681
Total fair value of unrealized losses on available for sale securities	$ 99,878	$ 187,948
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1	1
Available for sale, number of securities, 12 months or more | security	8	16
US Government-sponsored Enterprises Debt Securities [Member]
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (53)
Unrealized losses on available for sale securities, 12 months or more	(48)	0
Total unrealized losses on available for sale securities	(48)	(53)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,229	8,379
Fair value of unrealized losses on available for sale securities, less than 12 months	0	8,379
Fair value of unrealized losses on available for sale securities, 12 months or more	4,229	0
Total fair value of unrealized losses on available for sale securities	$ 4,229	$ 8,379
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	0	14
Available for sale, number of securities, 12 months or more | security	9	0
Other Debt securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (1)	$ 0
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(1)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	999	2,000
Fair value of unrealized losses on available for sale securities, less than 12 months	999	2,000
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 999	$ 2,000
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1	2
Available for sale, number of securities, 12 months or more | security	0	0
FNMA/FHLMC | Residential Related Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (9,144)	$ (500)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(9,144)	(500)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,170,981	163,002
Fair value of unrealized losses on available for sale securities, less than 12 months	1,170,981	163,002
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 1,170,981	$ 163,002
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	33	7
Available for sale, number of securities, 12 months or more | security	0	0
FNMA/FHLMC | Commercial mortgage-related securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (6,892)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(6,892)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	331,504
Fair value of unrealized losses on available for sale securities, less than 12 months	331,504
Fair value of unrealized losses on available for sale securities, 12 months or more	0
Total fair value of unrealized losses on available for sale securities	$ 331,504
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	19
Available for sale, number of securities, 12 months or more | security	0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (4,002)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(4,002)
Fair value of unrealized losses on held to maturity securities, less than 12 months	146,248
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 146,248
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	11
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
Government National Mortgage Association (GNMA) [Member] | Residential Related Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (3)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	0	(3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	69	9,784
Fair value of unrealized losses on available for sale securities, less than 12 months	69	9,784
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 69	$ 9,784
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1	2
Available for sale, number of securities, 12 months or more | security	0	0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months		$ 0
Unrealized losses on held to maturity securities, 12 months or more		0
Total unrealized losses on held to maturity securities		0
Fair value of unrealized losses on held to maturity securities, less than 12 months		325
Fair value of unrealized losses on held to maturity securities, 12 months or more		0
Total fair value of unrealized losses on held to maturity securities		$ 325
Government National Mortgage Association (GNMA) [Member] | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		1
Government National Mortgage Association (GNMA) [Member] | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		0
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months		$ 0
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		287
Fair value of unrealized losses on available for sale securities, less than 12 months		287
Fair value of unrealized losses on available for sale securities, 12 months or more		0
Total fair value of unrealized losses on available for sale securities		$ 287
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security		1
Available for sale, number of securities, 12 months or more | security		0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (22)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(22)
Fair value of unrealized losses on held to maturity securities, less than 12 months	15,631
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 15,631
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	1
Government National Mortgage Association (GNMA) [Member] | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0

Investment Securities (Details

Investment Securities (Details Textual) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Investment Securities Information [Line Items]
Proceeds from sales of investment securities	$ 0	$ 51,000,000	$ 8,000				$ 158,708,000	$ 626,283,000
Debt Securities, AFS, Principal Sold				$ 261,000,000	$ 281,000,000
Gain (Loss) on Sales of Mortgage Backed Securities (MBS)				$ 3,000,000	$ 6,000,000
Pledged Financial Instruments, Not Separately Reported, Securities	2,200,000,000						2,200,000,000		$ 1,600,000,000
Interest receivable	79,011,000						79,011,000		90,263,000
Debt Securities, Held-to-maturity, Nonaccrual, Interest Income							0	$ 0
Debt Securities, Held to Maturity, Past Due	0						0		0
Held to maturity allowance for credit loss	(49,000)						(49,000)		(67,000)
Federal Home Loan Bank Stock	82,000,000						82,000,000		82,000,000
Federal Reserve Bank Stock	87,000,000						87,000,000		87,000,000
Equity securities with readily determinable fair values, Fair Value	$ 4,000,000						4,000,000		2,000,000
Visa Restricted Stock Owned. Total	77,996
Visa Restricted Stock Owned at Fair Value	77,000
Visa Restricted Stock Donated						42,039
Visa Restricted Stock Owned at Zero Cost					996
Equity securities	$ 14,000,000						14,000,000		13,000,000
First Staunton Bancshares [Member]
Investment Securities Information [Line Items]
Carrying amount of Securities Sold					$ 84,000,000
Held-to-maturity Securities [Member]
Investment Securities Information [Line Items]
Interest receivable	12,000,000						12,000,000		14,000,000
Available-for-sale Securities [Member]
Investment Securities Information [Line Items]
Interest receivable	9,000,000						9,000,000		8,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Investment Securities Information [Line Items]
Interest receivable	974,000						974,000		972,000
Federal Reserve Bank Stock [Member]
Investment Securities Information [Line Items]
Interest receivable	$ 327,000						$ 327,000		$ 0

Loans Composition (Details)

Loans Composition (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 23,621,673	$ 24,451,724
Interest receivable	79,011	90,263
Loans and Finance Receivables [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest receivable	57,000	66,000
PPP
Loans and Leases Receivable Disclosure [Line Items]
Loans	182,121	767,757
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,927,459	7,701,422
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Loans	879,554	900,912
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	8,989,133	9,370,091
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Loans	4,296,489	4,342,584
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,834,871	1,840,417
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	6,131,360	6,183,001
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	15,120,493	15,553,091
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,590,895	7,878,324
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Loans	608,566	707,255
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	294,979	301,876
Auto
Loans and Leases Receivable Disclosure [Line Items]
Loans	6,739	11,177
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 8,501,180	$ 8,898,632

Loans, Credit Quality Indicator

Loans, Credit Quality Indicator by Vintage Year (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	$ 60,747	$ 69,246
Financing Receivable, Revolving	3,116,417	3,173,996
Financing Receivable, Originated in Current Fiscal Year	4,935,308	6,590,550
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,107,723	5,127,451
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,915,934	3,189,745
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,057,932	1,937,912
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,278,698	1,770,647
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,209,661	2,661,424
Total	23,621,673	24,451,724
Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	138	602
Financing Receivable, Revolving	2,010	11,341
Financing Receivable, Originated in Current Fiscal Year	63,212	99,324
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	71,061	141,213
Financing Receivable, Originated Two Years before Latest Fiscal Year	118,234	98,320
Financing Receivable, Originated Three Years before Latest Fiscal Year	22,034	958
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,300	22,498
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,832	9,911
Total	288,683	383,566
Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	57,187	27,819
Financing Receivable, Revolving	3,085,805	3,149,039
Financing Receivable, Originated in Current Fiscal Year	4,828,025	6,413,278
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,988,301	4,873,347
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,712,002	2,960,705
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,957,507	1,892,247
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,242,208	1,716,226
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,132,995	2,570,534
Total	22,946,842	23,575,376
Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,836	2,565
Financing Receivable, Revolving	28,435	13,483
Financing Receivable, Originated in Current Fiscal Year	18,306	59,116
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	37,707	51,593
Financing Receivable, Originated Two Years before Latest Fiscal Year	71,134	106,947
Financing Receivable, Originated Three Years before Latest Fiscal Year	46,635	6,038
Financing Receivable, Originated Four Years before Latest Fiscal Year	27,563	11,426
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	21,305	33,324
Total	251,087	281,928
Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	586	38,260
Financing Receivable, Revolving	167	133
Financing Receivable, Originated in Current Fiscal Year	25,766	18,831
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	10,653	61,298
Financing Receivable, Originated Two Years before Latest Fiscal Year	14,563	23,773
Financing Receivable, Originated Three Years before Latest Fiscal Year	31,756	38,669
Financing Receivable, Originated Four Years before Latest Fiscal Year	7,627	20,496
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	44,529	47,655
Total	135,062	210,854
Total commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	54,618	56,745
Financing Receivable, Revolving	2,442,565	2,436,370
Financing Receivable, Originated in Current Fiscal Year	3,520,198	4,390,063
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,056,052	3,610,033
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,847,007	2,547,526
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,580,116	918,783
Financing Receivable, Originated Four Years before Latest Fiscal Year	539,047	839,831
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,135,508	810,485
Total	15,120,493	15,553,091
Total commercial | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	1,606	10,272
Financing Receivable, Originated in Current Fiscal Year	63,212	99,311
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	71,061	140,803
Financing Receivable, Originated Two Years before Latest Fiscal Year	118,220	97,964
Financing Receivable, Originated Three Years before Latest Fiscal Year	21,858	813
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,300	22,361
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,076	8,562
Total	287,333	380,086
Total commercial | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	51,793	17,524
Financing Receivable, Revolving	2,412,524	2,414,537
Financing Receivable, Originated in Current Fiscal Year	3,415,239	4,216,457
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,939,040	3,359,482
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,648,264	2,325,808
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,485,495	880,708
Financing Receivable, Originated Four Years before Latest Fiscal Year	510,266	797,441
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,103,537	760,973
Total	14,514,363	14,755,405
Total commercial | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,825	2,565
Financing Receivable, Revolving	28,435	11,561
Financing Receivable, Originated in Current Fiscal Year	17,758	57,916
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	37,367	50,905
Financing Receivable, Originated Two Years before Latest Fiscal Year	70,725	106,295
Financing Receivable, Originated Three Years before Latest Fiscal Year	46,294	6,038
Financing Receivable, Originated Four Years before Latest Fiscal Year	27,481	11,247
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	20,481	32,150
Total	248,541	276,111
Total commercial | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	36,655
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	23,989	16,379
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,584	58,845
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,798	17,460
Financing Receivable, Originated Three Years before Latest Fiscal Year	26,470	31,224
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	8,781
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,415	8,801
Total	70,256	141,490
Total commercial | PPP
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	151,940	767,757
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	30,180	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	182,121	767,757
Total commercial | PPP | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	212	3,988
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	281	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	493	3,988
Total commercial | PPP | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	147,568	745,767
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	29,900	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	177,467	745,767
Total commercial | PPP | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	4,160	18,002
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	4,160	18,002
Total commercial | Commercial And Industrial Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4,910	24,045
Financing Receivable, Revolving	2,307,525	2,194,534
Financing Receivable, Originated in Current Fiscal Year	1,671,979	1,417,548
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,052,674	1,509,575
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,168,685	1,292,938
Financing Receivable, Originated Three Years before Latest Fiscal Year	830,748	502,962
Financing Receivable, Originated Four Years before Latest Fiscal Year	269,240	321,471
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	626,609	462,394
Total	7,927,459	7,701,422
Total commercial | Commercial And Industrial Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	1,396	10,159
Financing Receivable, Originated in Current Fiscal Year	5,900	2,719
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	193	39,854
Financing Receivable, Originated Two Years before Latest Fiscal Year	28,918	37,042
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	113
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	215
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,990	67
Total	39,397	90,169
Total commercial | Commercial And Industrial Financing Receivable [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,085	4,628
Financing Receivable, Revolving	2,278,181	2,177,138
Financing Receivable, Originated in Current Fiscal Year	1,664,130	1,389,260
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,046,760	1,435,519
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,092,662	1,182,302
Financing Receivable, Originated Three Years before Latest Fiscal Year	802,214	483,957
Financing Receivable, Originated Four Years before Latest Fiscal Year	249,129	305,998
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	621,500	453,734
Total	7,754,575	7,427,908
Total commercial | Commercial And Industrial Financing Receivable [Member] | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,825	2,565
Financing Receivable, Revolving	27,948	7,237
Financing Receivable, Originated in Current Fiscal Year	1,933	19,331
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,555	28,413
Financing Receivable, Originated Two Years before Latest Fiscal Year	46,997	56,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	21,286	2,269
Financing Receivable, Originated Four Years before Latest Fiscal Year	20,111	6,477
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,160	1,179
Total	124,990	121,487
Total commercial | Commercial And Industrial Financing Receivable [Member] | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	16,852
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	17	6,238
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	166	5,789
Financing Receivable, Originated Two Years before Latest Fiscal Year	108	17,014
Financing Receivable, Originated Three Years before Latest Fiscal Year	7,248	16,623
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	8,781
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	959	7,414
Total	8,497	61,859
Total commercial | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	11,667	1,150
Financing Receivable, Revolving	23,127	21,621
Financing Receivable, Originated in Current Fiscal Year	150,094	191,847
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	182,668	221,107
Financing Receivable, Originated Two Years before Latest Fiscal Year	205,518	128,660
Financing Receivable, Originated Three Years before Latest Fiscal Year	115,366	102,012
Financing Receivable, Originated Four Years before Latest Fiscal Year	64,353	152,067
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	138,427	83,598
Total	879,554	900,912
Total commercial | Commercial real estate — owner occupied | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	211	113
Financing Receivable, Originated in Current Fiscal Year	0	1,882
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,303	3,122
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,368	300
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	658
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	264
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	250	0
Total	15,132	6,339
Total commercial | Commercial real estate — owner occupied | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	11,667	1,150
Financing Receivable, Revolving	22,430	18,022
Financing Receivable, Originated in Current Fiscal Year	143,911	185,861
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	173,396	209,069
Financing Receivable, Originated Two Years before Latest Fiscal Year	193,463	128,360
Financing Receivable, Originated Three Years before Latest Fiscal Year	114,618	99,546
Financing Receivable, Originated Four Years before Latest Fiscal Year	61,713	147,366
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	133,641	79,111
Total	843,173	867,335
Total commercial | Commercial real estate — owner occupied | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	487	3,486
Financing Receivable, Originated in Current Fiscal Year	6,182	4,104
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,969	8,916
Financing Receivable, Originated Two Years before Latest Fiscal Year	686	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	748	1,490
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,640	4,437
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,529	3,747
Total	21,241	26,179
Total commercial | Commercial real estate — owner occupied | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	318
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7	740
Total	7	1,058
Total commercial | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	16,577	25,195
Financing Receivable, Revolving	2,330,652	2,216,154
Financing Receivable, Originated in Current Fiscal Year	1,974,013	2,377,152
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,265,523	1,730,682
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,374,203	1,421,598
Financing Receivable, Originated Three Years before Latest Fiscal Year	946,114	604,974
Financing Receivable, Originated Four Years before Latest Fiscal Year	333,593	473,539
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	765,036	545,992
Total	8,989,133	9,370,091
Total commercial | Commercial and business lending | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	1,606	10,272
Financing Receivable, Originated in Current Fiscal Year	6,112	8,589
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,777	42,976
Financing Receivable, Originated Two Years before Latest Fiscal Year	40,287	37,342
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	771
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	479
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,240	67
Total	55,022	100,496
Total commercial | Commercial and business lending | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	13,752	5,778
Financing Receivable, Revolving	2,300,611	2,195,160
Financing Receivable, Originated in Current Fiscal Year	1,955,609	2,320,888
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,250,056	1,644,588
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,286,125	1,310,662
Financing Receivable, Originated Three Years before Latest Fiscal Year	916,832	583,503
Financing Receivable, Originated Four Years before Latest Fiscal Year	310,842	453,364
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	755,141	532,845
Total	8,775,216	9,041,009
Total commercial | Commercial and business lending | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,825	2,565
Financing Receivable, Revolving	28,435	10,723
Financing Receivable, Originated in Current Fiscal Year	12,275	41,437
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,524	37,329
Financing Receivable, Originated Two Years before Latest Fiscal Year	47,683	56,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	22,034	3,759
Financing Receivable, Originated Four Years before Latest Fiscal Year	22,751	10,915
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,688	4,926
Total	150,391	165,668
Total commercial | Commercial and business lending | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	16,852
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	17	6,238
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	166	5,789
Financing Receivable, Originated Two Years before Latest Fiscal Year	108	17,014
Financing Receivable, Originated Three Years before Latest Fiscal Year	7,248	16,941
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	8,781
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	966	8,154
Total	8,504	62,917
Total commercial | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	38,041	30,774
Financing Receivable, Revolving	85,353	172,335
Financing Receivable, Originated in Current Fiscal Year	964,920	1,366,364
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,058,894	1,140,297
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,121,923	763,933
Financing Receivable, Originated Three Years before Latest Fiscal Year	524,225	288,533
Financing Receivable, Originated Four Years before Latest Fiscal Year	184,259	363,779
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	356,916	247,343
Total	4,296,489	4,342,584
Total commercial | Commercial real estate — investor | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	57,100	90,235
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	67,285	97,333
Financing Receivable, Originated Two Years before Latest Fiscal Year	74,040	12,339
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,973	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,259	21,882
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,836	8,465
Total	212,491	230,254
Total commercial | Commercial real estate — investor | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	38,041	10,971
Financing Receivable, Revolving	85,353	171,497
Financing Receivable, Originated in Current Fiscal Year	878,373	1,249,644
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	957,478	976,332
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,034,119	720,237
Financing Receivable, Originated Three Years before Latest Fiscal Year	474,770	271,987
Financing Receivable, Originated Four Years before Latest Fiscal Year	178,270	341,658
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	335,168	211,360
Total	3,943,532	3,942,714
Total commercial | Commercial real estate — investor | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	838
Financing Receivable, Originated in Current Fiscal Year	5,474	16,343
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,720	13,575
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,074	30,911
Financing Receivable, Originated Three Years before Latest Fiscal Year	24,259	2,279
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,730	239
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14,705	27,209
Total	78,962	91,396
Total commercial | Commercial real estate — investor | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	19,803
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	23,973	10,141
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,412	53,056
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,690	446
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,222	14,267
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	207	309
Total	61,504	78,220
Total commercial | Real Estate Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	776
Financing Receivable, Revolving	26,560	47,880
Financing Receivable, Originated in Current Fiscal Year	581,265	646,547
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	731,634	739,055
Financing Receivable, Originated Two Years before Latest Fiscal Year	350,881	361,996
Financing Receivable, Originated Three Years before Latest Fiscal Year	109,778	25,277
Financing Receivable, Originated Four Years before Latest Fiscal Year	21,195	2,513
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13,556	17,150
Total	1,834,871	1,840,417
Total commercial | Real Estate Construction | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	487
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	494
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,894	48,283
Financing Receivable, Originated Three Years before Latest Fiscal Year	15,885	42
Financing Receivable, Originated Four Years before Latest Fiscal Year	41	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	30
Total	19,820	49,336
Total commercial | Real Estate Construction | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	776
Financing Receivable, Revolving	26,560	47,880
Financing Receivable, Originated in Current Fiscal Year	581,257	645,925
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	731,505	738,561
Financing Receivable, Originated Two Years before Latest Fiscal Year	328,020	294,910
Financing Receivable, Originated Three Years before Latest Fiscal Year	93,893	25,219
Financing Receivable, Originated Four Years before Latest Fiscal Year	21,154	2,420
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13,227	16,768
Total	1,795,616	1,771,682
Total commercial | Real Estate Construction | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	8	135
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	124	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	18,968	18,803
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	93
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	87	15
Total	19,187	19,046
Total commercial | Real Estate Construction | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	242	338
Total	247	353
Total commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	38,041	31,549
Financing Receivable, Revolving	111,913	220,215
Financing Receivable, Originated in Current Fiscal Year	1,546,185	2,012,911
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,790,529	1,879,352
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,472,804	1,125,929
Financing Receivable, Originated Three Years before Latest Fiscal Year	634,002	313,810
Financing Receivable, Originated Four Years before Latest Fiscal Year	205,454	366,292
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	370,472	264,493
Total	6,131,360	6,183,001
Total commercial | Commercial Real Estate | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	57,100	90,722
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	67,285	97,827
Financing Receivable, Originated Two Years before Latest Fiscal Year	77,934	60,622
Financing Receivable, Originated Three Years before Latest Fiscal Year	21,858	42
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,300	21,882
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,836	8,494
Total	232,312	279,590
Total commercial | Commercial Real Estate | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	38,041	11,746
Financing Receivable, Revolving	111,913	219,377
Financing Receivable, Originated in Current Fiscal Year	1,459,630	1,895,569
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,688,983	1,714,893
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,362,139	1,015,146
Financing Receivable, Originated Three Years before Latest Fiscal Year	568,663	297,205
Financing Receivable, Originated Four Years before Latest Fiscal Year	199,424	344,078
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	348,395	228,127
Total	5,739,148	5,714,396
Total commercial | Commercial Real Estate | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	838
Financing Receivable, Originated in Current Fiscal Year	5,483	16,479
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,844	13,575
Financing Receivable, Originated Two Years before Latest Fiscal Year	23,041	49,714
Financing Receivable, Originated Three Years before Latest Fiscal Year	24,259	2,279
Financing Receivable, Originated Four Years before Latest Fiscal Year	4,730	332
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14,792	27,224
Total	98,150	110,442
Total commercial | Commercial Real Estate | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	19,803
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	23,973	10,141
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,417	53,056
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,690	446
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,222	14,283
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	448	647
Total	61,751	78,573
Total consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	6,128	12,501
Financing Receivable, Revolving	673,852	737,626
Financing Receivable, Originated in Current Fiscal Year	1,415,110	2,200,487
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,051,672	1,517,417
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,068,927	642,218
Financing Receivable, Originated Three Years before Latest Fiscal Year	477,816	1,019,128
Financing Receivable, Originated Four Years before Latest Fiscal Year	739,650	930,816
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,074,153	1,850,939
Total	8,501,180	8,898,632
Total consumer | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	138	602
Financing Receivable, Revolving	403	1,069
Financing Receivable, Originated in Current Fiscal Year	0	13
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	410
Financing Receivable, Originated Two Years before Latest Fiscal Year	14	356
Financing Receivable, Originated Three Years before Latest Fiscal Year	176	145
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	137
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	756	1,349
Total	1,350	3,480
Total consumer | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5,394	10,294
Financing Receivable, Revolving	673,281	734,502
Financing Receivable, Originated in Current Fiscal Year	1,412,786	2,196,822
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,049,262	1,513,865
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,063,738	634,897
Financing Receivable, Originated Three Years before Latest Fiscal Year	472,012	1,011,539
Financing Receivable, Originated Four Years before Latest Fiscal Year	731,942	918,785
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,029,458	1,809,561
Total	8,432,478	8,819,971
Total consumer | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	10	0
Financing Receivable, Revolving	0	1,922
Financing Receivable, Originated in Current Fiscal Year	548	1,200
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	340	689
Financing Receivable, Originated Two Years before Latest Fiscal Year	409	652
Financing Receivable, Originated Three Years before Latest Fiscal Year	341	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	82	179
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	825	1,174
Total	2,546	5,817
Total consumer | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	586	1,605
Financing Receivable, Revolving	167	133
Financing Receivable, Originated in Current Fiscal Year	1,776	2,452
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,070	2,454
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,765	6,313
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,287	7,445
Financing Receivable, Originated Four Years before Latest Fiscal Year	7,627	11,714
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	43,114	38,854
Total	64,806	69,364
Total consumer | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	1,406,816	2,187,918
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,043,286	1,493,903
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,053,548	621,983
Financing Receivable, Originated Three Years before Latest Fiscal Year	465,425	1,005,290
Financing Receivable, Originated Four Years before Latest Fiscal Year	729,974	923,105
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,891,844	1,646,124
Total	7,590,895	7,878,324
Total consumer | Residential mortgage | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	355
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	330
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	102
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	126
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	377	537
Total	377	1,450
Total consumer | Residential mortgage | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	1,404,558	2,185,240
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,040,914	1,490,589
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,048,656	615,118
Financing Receivable, Originated Three Years before Latest Fiscal Year	460,120	998,072
Financing Receivable, Originated Four Years before Latest Fiscal Year	722,589	911,797
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,854,629	1,612,971
Total	7,531,466	7,813,788
Total consumer | Residential mortgage | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	538	1,200
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	340	689
Financing Receivable, Originated Two Years before Latest Fiscal Year	409	652
Financing Receivable, Originated Three Years before Latest Fiscal Year	326	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	82	179
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	679	1,028
Total	2,374	3,749
Total consumer | Residential mortgage | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	1,721	1,478
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,032	2,271
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,483	5,882
Financing Receivable, Originated Three Years before Latest Fiscal Year	4,979	7,116
Financing Receivable, Originated Four Years before Latest Fiscal Year	7,304	11,003
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	36,160	31,587
Total	56,678	59,337
Total consumer | Home Equity Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5,658	12,421
Financing Receivable, Revolving	504,767	572,041
Financing Receivable, Originated in Current Fiscal Year	839	3,022
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,643	13,141
Financing Receivable, Originated Two Years before Latest Fiscal Year	9,078	16,216
Financing Receivable, Originated Three Years before Latest Fiscal Year	10,364	11,952
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,841	6,518
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	73,034	84,364
Total	608,566	707,255
Total consumer | Home Equity Loan [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	74	596
Financing Receivable, Revolving	17	631
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	39
Financing Receivable, Originated Two Years before Latest Fiscal Year	1	14
Financing Receivable, Originated Three Years before Latest Fiscal Year	110	39
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	375	804
Total	503	1,532
Total consumer | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4,992	10,224
Financing Receivable, Revolving	504,747	569,389
Financing Receivable, Originated in Current Fiscal Year	773	2,057
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,617	12,968
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,850	15,792
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,952	11,594
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,538	5,803
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	65,577	76,165
Total	600,053	693,767
Total consumer | Home Equity Loan [Member] | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	10	0
Financing Receivable, Revolving	0	1,922
Financing Receivable, Originated in Current Fiscal Year	10	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	15	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	146	146
Total	171	2,068
Total consumer | Home Equity Loan [Member] | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	582	1,600
Financing Receivable, Revolving	4	100
Financing Receivable, Originated in Current Fiscal Year	56	965
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25	134
Financing Receivable, Originated Two Years before Latest Fiscal Year	227	410
Financing Receivable, Originated Three Years before Latest Fiscal Year	288	319
Financing Receivable, Originated Four Years before Latest Fiscal Year	303	711
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,936	7,249
Total	7,838	9,888
Total consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	471	81
Financing Receivable, Revolving	169,084	165,585
Financing Receivable, Originated in Current Fiscal Year	7,455	9,547
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,743	10,374
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,300	4,019
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,026	1,886
Financing Receivable, Originated Four Years before Latest Fiscal Year	835	1,192
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	109,275	120,451
Total	301,718	313,054
Total consumer | Other consumer | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	64	5
Financing Receivable, Revolving	387	438
Financing Receivable, Originated in Current Fiscal Year	0	13
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	16
Financing Receivable, Originated Two Years before Latest Fiscal Year	13	11
Financing Receivable, Originated Three Years before Latest Fiscal Year	66	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4	8
Total	470	498
Total consumer | Other consumer | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	402	70
Financing Receivable, Revolving	168,534	165,114
Financing Receivable, Originated in Current Fiscal Year	7,455	9,525
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,730	10,309
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,232	3,987
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,940	1,872
Financing Receivable, Originated Four Years before Latest Fiscal Year	815	1,185
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	109,253	120,425
Total	300,959	312,416
Total consumer | Other consumer | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4	5
Financing Receivable, Revolving	164	33
Financing Receivable, Originated in Current Fiscal Year	0	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12	49
Financing Receivable, Originated Two Years before Latest Fiscal Year	56	21
Financing Receivable, Originated Three Years before Latest Fiscal Year	20	10
Financing Receivable, Originated Four Years before Latest Fiscal Year	20	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18	18
Total	$ 290	$ 140

Loans Past Due Status (Details)

Loans Past Due Status (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Summarized details of Loans
Current(a)	$ 23,455,426	$ 23,455,426	$ 24,202,209
Nonaccrual(b)(c)	135,062	135,062	210,854
Loans and Leases Receivable, Net of Deferred Income, Total	23,621,673	23,621,673	24,451,724
Nonaccrual Loans, Current Portion	$ 83,000	$ 83,000	$ 128,000
Percent of current nonaccrual loans	62.00%	62.00%	61.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	11,000	11,000	28,000
30-59 Days Past Due
Summarized details of Loans
Total Past Due	28,815	28,815	18,077
60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,341	1,341	18,985
90+ Days Past Due
Summarized details of Loans
Total Past Due	1,029	1,029	1,598
PPP
Summarized details of Loans
Current(a)	181,552	181,552	767,757
Nonaccrual(b)(c)	0	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	182,121	182,121	767,757
PPP | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	485	485	0
PPP | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	83	83	0
PPP | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial and industrial
Summarized details of Loans
Current(a)	7,917,635	7,917,635	7,633,269
Nonaccrual(b)(c)	8,497	8,497	61,859
Loans and Leases Receivable, Net of Deferred Income, Total	7,927,459	7,927,459	7,701,422
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,121	1,121	2,819
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	108	108	3,300
Commercial and industrial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	98	98	175
Commercial real estate — owner occupied
Summarized details of Loans
Current(a)	879,516	879,516	899,480
Nonaccrual(b)(c)	7	7	1,058
Loans and Leases Receivable, Net of Deferred Income, Total	879,554	879,554	900,912
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	30	30	158
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	215
Commercial real estate — owner occupied | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial and business lending
Summarized details of Loans
Current(a)	8,978,704	8,978,704	9,300,506
Nonaccrual(b)(c)	8,504	8,504	62,917
Loans and Leases Receivable, Net of Deferred Income, Total	8,989,133	8,989,133	9,370,091
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,636	1,636	2,977
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	191	191	3,516
Commercial and business lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	98	98	175
Commercial real estate — investor
Summarized details of Loans
Current(a)	4,217,965	4,217,965	4,251,571
Nonaccrual(b)(c)	61,504	61,504	78,220
Loans and Leases Receivable, Net of Deferred Income, Total	4,296,489	4,296,489	4,342,584
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	17,021	17,021	1,024
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	11,769
Commercial real estate — investor | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Real estate construction
Summarized details of Loans
Current(a)	1,834,623	1,834,623	1,839,073
Nonaccrual(b)(c)	247	247	353
Loans and Leases Receivable, Net of Deferred Income, Total	1,834,871	1,834,871	1,840,417
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0	991
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Real estate construction | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate lending
Summarized details of Loans
Current(a)	6,052,588	6,052,588	6,090,644
Nonaccrual(b)(c)	61,751	61,751	78,573
Loans and Leases Receivable, Net of Deferred Income, Total	6,131,360	6,131,360	6,183,001
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	17,021	17,021	2,015
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	11,769
Commercial real estate lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Total commercial
Summarized details of Loans
Current(a)	15,031,292	15,031,292	15,391,150
Nonaccrual(b)(c)	70,256	70,256	141,490
Loans and Leases Receivable, Net of Deferred Income, Total	15,120,493	15,120,493	15,553,091
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	18,657	18,657	4,992
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	191	191	15,284
Total commercial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	98	98	175
Residential mortgage
Summarized details of Loans
Current(a)	7,526,996	7,526,996	7,808,294
Nonaccrual(b)(c)	56,678	56,678	59,337
Loans and Leases Receivable, Net of Deferred Income, Total	7,590,895	7,590,895	7,878,324
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,996	6,996	8,975
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	99	99	1,410
Residential mortgage | 90+ Days Past Due
Summarized details of Loans
Total Past Due	126	126	308
Home equity
Summarized details of Loans
Current(a)	597,776	597,776	692,565
Nonaccrual(b)(c)	7,838	7,838	9,888
Loans and Leases Receivable, Net of Deferred Income, Total	608,566	608,566	707,255
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,428	2,428	3,071
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	503	503	1,731
Home equity | 90+ Days Past Due
Summarized details of Loans
Total Past Due	21	21	0
Other consumer
Summarized details of Loans
Current(a)	292,700	292,700	299,128
Nonaccrual(b)(c)	222	222	91
Loans and Leases Receivable, Net of Deferred Income, Total	294,979	294,979	301,876
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	724	724	998
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	549	549	545
Other consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	785	785	1,115
Auto
Summarized details of Loans
Current(a)	6,662	6,662	11,072
Nonaccrual(b)(c)	67	67	49
Loans and Leases Receivable, Net of Deferred Income, Total	6,739	6,739	11,177
Auto | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	10	10	41
Auto | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	15
Auto | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Total consumer
Summarized details of Loans
Current(a)	8,424,134	8,424,134	8,811,060
Nonaccrual(b)(c)	64,806	64,806	69,364
Loans and Leases Receivable, Net of Deferred Income, Total	8,501,180	8,501,180	8,898,632
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	10,158	10,158	13,085
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,150	1,150	3,701
Total consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	$ 932	$ 932	$ 1,423

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	$ 44,499	$ 52,092
Nonaccrual Restructured Loans(a)	15,226	20,190
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	11,067	12,713
Nonaccrual Restructured Loans(a)	959	6,967
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,031	1,711
Nonaccrual Restructured Loans(a)	0	0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	13,236	26,435
Nonaccrual Restructured Loans(a)	207	225
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	248	260
Nonaccrual Restructured Loans(a)	107	111
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	15,253	7,825
Nonaccrual Restructured Loans(a)	13,235	11,509
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	2,787	1,957
Nonaccrual Restructured Loans(a)	718	1,379
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	877	1,191
Nonaccrual Restructured Loans(a)	$ 0	$ 0

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	70	57
Recorded Investment(a)	$ 13,670	$ 8,800
Unpaid Principal Balance(b)	$ 13,744	$ 9,280
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	4	3
Recorded Investment(a)	$ 638	$ 1,250
Unpaid Principal Balance(b)	$ 638	$ 1,324
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	2
Recorded Investment(a)	$ 0	$ 453
Unpaid Principal Balance(b)	$ 0	$ 751
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	4	1
Recorded Investment(a)	$ 1,682	$ 530
Unpaid Principal Balance(b)	$ 1,682	$ 530
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 102
Unpaid Principal Balance(b)	$ 0	$ 102
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	55	32
Recorded Investment(a)	$ 10,434	$ 5,789
Unpaid Principal Balance(b)	$ 10,460	$ 5,870
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	7	18
Recorded Investment(a)	$ 916	$ 676
Unpaid Principal Balance(b)	$ 963	$ 702

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	9
Recorded Investment | $	$ 200	$ 1,244
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	5
Recorded Investment | $	$ 200	$ 1,036
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	4
Recorded Investment | $	$ 0	$ 208

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			$ 47,776	$ 21,907	$ 21,907
Off-Balance Sheet, Credit Loss, Liability	$ 41,276		41,276		47,776
Provision for credit losses			(6,500)		7,000
Balance at end of period	41,276		41,276		47,776
Allowance for credit losses on loans
Provision for credit losses	(24,010)	$ 43,009	(82,018)	157,009
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			383,702
Balance at end of period	290,997		290,997		383,702
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total allowance for loan losses	290,997		290,997		383,702
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	23,621,673		23,621,673		24,451,724
Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						$ 40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,690
PPP
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	182,121		182,121		767,757
Commercial and industrial
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	7,927,459		7,927,459		7,701,422
Commercial real estate — owner occupied
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	879,554		879,554		900,912
Commercial and business lending
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	8,989,133		8,989,133		9,370,091
Commercial real estate — investor
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	4,296,489		4,296,489		4,342,584
Real estate construction
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	1,834,871		1,834,871		1,840,417
Commercial real estate lending
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	6,131,360		6,131,360		6,183,001
Total commercial
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	15,120,493		15,120,493		15,553,091
Home equity
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	608,566		608,566		707,255
Auto
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	6,739		6,739		11,177
Total consumer
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total	8,501,180		8,501,180		8,898,632
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			383,702	201,371	201,371
Financing Receivable, Allowance for Credit Loss	290,997		290,997		383,702
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Provision for credit losses			(75,500)		164,457
Balance at end of period	290,997		290,997		383,702
Allowance for credit losses on loans
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(31,784)		(112,053)
Net Charge offs			(17,205)		(100,631)
Allowance for Loan Losses [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						313,828
Allowance for Loan Losses [Member] | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					2,543
Allowance for Loan Losses [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						112,457
Allowance for Loan Losses [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			531	0	0
Financing Receivable, Allowance for Credit Loss	125		125		531
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Provision for credit losses			(406)		531
Balance at end of period	125		125		531
Allowance for credit losses on loans
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			0		0
Net Charge offs			0		0
Allowance for Loan Losses [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						0
Allowance for Loan Losses [Member] | PPP | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					0
Allowance for Loan Losses [Member] | PPP | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						0
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			142,793	91,133	91,133
Financing Receivable, Allowance for Credit Loss	89,111		89,111		142,793
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Provision for credit losses			(47,324)		71,355
Balance at end of period	89,111		89,111		142,793
Allowance for credit losses on loans
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(13,773)		(80,320)
Net Charge offs			(6,358)		(73,316)
Allowance for Loan Losses [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						144,052
Allowance for Loan Losses [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					408
Allowance for Loan Losses [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						52,919
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			11,274	10,284	10,284
Financing Receivable, Allowance for Credit Loss	12,022		12,022		11,274
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Provision for credit losses			634		1,967
Balance at end of period	12,022		12,022		11,274
Allowance for credit losses on loans
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			0		(419)
Net Charge offs			115		(272)
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						8,433
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					255
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						(1,851)
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			154,598	101,417	101,417
Financing Receivable, Allowance for Credit Loss	101,259		101,259		154,598
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Provision for credit losses			(47,096)		73,853
Balance at end of period	101,259		101,259		154,598
Allowance for credit losses on loans
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(13,773)		(80,739)
Net Charge offs			(6,242)		(73,588)
Allowance for Loan Losses [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						152,485
Allowance for Loan Losses [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					663
Allowance for Loan Losses [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						51,068
Allowance for Loan Losses [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			93,435	40,514	40,514
Financing Receivable, Allowance for Credit Loss	81,461		81,461		93,435
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Provision for credit losses			(680)		71,933
Balance at end of period	81,461		81,461		93,435
Allowance for credit losses on loans
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(14,340)		(22,920)
Net Charge offs			(11,293)		(22,277)
Allowance for Loan Losses [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						42,555
Allowance for Loan Losses [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					472
Allowance for Loan Losses [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						2,041
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			59,193	24,915	24,915
Financing Receivable, Allowance for Credit Loss	40,965		40,965		59,193
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Provision for credit losses			(18,298)		25,854
Balance at end of period	40,965		40,965		59,193
Allowance for credit losses on loans
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(5)		(19)
Net Charge offs			69		31
Allowance for Loan Losses [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						32,382
Allowance for Loan Losses [Member] | Real estate construction | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					492
Allowance for Loan Losses [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						7,467
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			152,629	65,428	65,428
Financing Receivable, Allowance for Credit Loss	122,426		122,426		152,629
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Provision for credit losses			(18,978)		97,787
Balance at end of period	122,426		122,426		152,629
Allowance for credit losses on loans
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(14,344)		(22,938)
Net Charge offs			(11,224)		(22,246)
Allowance for Loan Losses [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						74,937
Allowance for Loan Losses [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					964
Allowance for Loan Losses [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						9,508
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			307,226	166,846	166,846
Financing Receivable, Allowance for Credit Loss	223,685		223,685		307,226
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Provision for credit losses			(66,074)		171,641
Balance at end of period	223,685		223,685		307,226
Allowance for credit losses on loans
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(28,117)		(103,677)
Net Charge offs			(17,467)		(95,834)
Allowance for Loan Losses [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						227,422
Allowance for Loan Losses [Member] | Total commercial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					1,627
Allowance for Loan Losses [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						60,576
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			42,996	16,960	16,960
Financing Receivable, Allowance for Credit Loss	41,620		41,620		42,996
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Provision for credit losses			(1,344)		(6,864)
Balance at end of period	41,620		41,620		42,996
Allowance for credit losses on loans
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(732)		(1,867)
Net Charge offs			(32)		(1,367)
Allowance for Loan Losses [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						50,175
Allowance for Loan Losses [Member] | Residential mortgage | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					403
Allowance for Loan Losses [Member] | Residential mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						33,215
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			18,849	10,926	10,926
Financing Receivable, Allowance for Credit Loss	14,317		14,317		18,849
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Provision for credit losses			(6,172)		(4,781)
Balance at end of period	14,317		14,317		18,849
Allowance for credit losses on loans
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(600)		(1,719)
Net Charge offs			1,640		259
Allowance for Loan Losses [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						22,575
Allowance for Loan Losses [Member] | Home equity | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					374
Allowance for Loan Losses [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						11,649
Allowance for Loan Losses [Member] | Other consumer(a)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			14,630	6,639	6,639
Financing Receivable, Allowance for Credit Loss					14,630
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Provision for credit losses					4,462
Balance at end of period					14,630
Allowance for credit losses on loans
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs					(4,790)
Net Charge offs					(3,689)
Allowance for Loan Losses [Member] | Other consumer(a) | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						13,655
Allowance for Loan Losses [Member] | Other consumer(a) | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					140
Allowance for Loan Losses [Member] | Other consumer(a) | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						7,016
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			14,456
Financing Receivable, Allowance for Credit Loss	11,253		11,253		14,456
Recoveries			965
Net Charge offs			(1,366)
Provision for credit losses			(1,836)
Balance at end of period	11,253		11,253		14,456
Allowance for credit losses on loans
Recoveries			965
Net Charge offs			(1,366)
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(2,331)
Net Charge offs			(1,366)
Allowance for Loan Losses [Member] | Auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			174
Financing Receivable, Allowance for Credit Loss	120		120		174
Recoveries			24
Net Charge offs			20
Provision for credit losses			(74)
Balance at end of period	120		120		174
Allowance for credit losses on loans
Recoveries			24
Net Charge offs			20
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(4)
Net Charge offs			20
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			76,475	34,525	34,525
Financing Receivable, Allowance for Credit Loss	67,311		67,311		76,475
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Provision for credit losses			(9,426)		(7,183)
Balance at end of period	67,311		67,311		76,475
Allowance for credit losses on loans
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(3,667)		(8,376)
Net Charge offs			262		(4,797)
Allowance for Loan Losses [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						86,405
Allowance for Loan Losses [Member] | Total consumer | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses					917
Allowance for Loan Losses [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						51,880
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			47,776	21,907	21,907
Off-Balance Sheet, Credit Loss, Liability	41,276		41,276		47,776
Provision for credit losses			(6,500)		7,000
Balance at end of period	41,276		41,276		47,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						40,597
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					179
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,690
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			22,311	12,276	12,276
Off-Balance Sheet, Credit Loss, Liability	19,402		19,402		22,311
Provision for credit losses			(2,910)		13,972
Balance at end of period	19,402		19,402		22,311
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						8,278
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					61
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						(3,998)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			266	127	127
Off-Balance Sheet, Credit Loss, Liability	309		309		266
Provision for credit losses			43		135
Balance at end of period	309		309		266
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						127
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					4
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			22,577	12,403	12,403
Off-Balance Sheet, Credit Loss, Liability	19,711		19,711		22,577
Provision for credit losses			(2,867)		14,108
Balance at end of period	19,711		19,711		22,577
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						8,405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					65
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						(3,998)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			636	530	530
Off-Balance Sheet, Credit Loss, Liability	721		721		636
Provision for credit losses			85		(141)
Balance at end of period	721		721		636
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					2
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						246
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			18,887	7,532	7,532
Off-Balance Sheet, Credit Loss, Liability	15,476		15,476		18,887
Provision for credit losses			(3,411)		(7,038)
Balance at end of period	15,476		15,476		18,887
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						25,879
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					45
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,347
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			19,523	8,062	8,062
Off-Balance Sheet, Credit Loss, Liability	16,197		16,197		19,523
Provision for credit losses			(3,326)		(7,179)
Balance at end of period	16,197		16,197		19,523
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						26,655
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					47
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,593
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			42,101	20,465	20,465
Off-Balance Sheet, Credit Loss, Liability	35,908		35,908		42,101
Provision for credit losses			(6,193)		6,929
Balance at end of period	35,908		35,908		42,101
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						35,060
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					112
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						14,595
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			3,118	1,038	1,038
Off-Balance Sheet, Credit Loss, Liability	3,031		3,031		3,118
Provision for credit losses			(87)		(577)
Balance at end of period	3,031		3,031		3,118
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						3,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						2,591
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			2,557	405	405
Off-Balance Sheet, Credit Loss, Liability	2,337		2,337		2,557
Provision for credit losses			(220)		649
Balance at end of period	2,337		2,337		2,557
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a) | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						1,909
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a) | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer(a) | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						1,504
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			5,675	1,443	1,443
Off-Balance Sheet, Credit Loss, Liability	5,368		5,368		5,675
Provision for credit losses			(307)		72
Balance at end of period	5,368		5,368		5,675
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						5,538
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses					66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						4,095
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Allowance for credit losses on loans
Balance at beginning of period			431,478	223,278	223,278
Allowance for Credit Losses on Loans	332,273		332,273		431,478
Recoveries			14,579		11,422
Net Charge offs			(17,205)		(100,631)
Gross up of allowance for PCD loans at acquisition					3,504
Provision for credit losses			(82,000)		171,457
Balance at end of period	$ 332,273		$ 332,273		$ 431,478
Percent of Loans	1.41%		1.41%		1.76%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (31,784)		$ (112,053)
Net Charge offs			(17,205)		(100,631)
Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						354,425
Allowance for Loans Losses and Unfunded Commitments [Member] | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					2,722
Allowance for Loans Losses and Unfunded Commitments [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						131,147
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Allowance for credit losses on loans
Balance at beginning of period			531	0	0
Allowance for Credit Losses on Loans	$ 125		125		531
Recoveries			0		0
Net Charge offs			0		0
Gross up of allowance for PCD loans at acquisition					0
Provision for credit losses			(406)		531
Balance at end of period	$ 125		$ 125		$ 531
Percent of Loans	0.07%		0.07%		0.07%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ 0		$ 0
Net Charge offs			0		0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						0
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Allowance for credit losses on loans
Balance at beginning of period			165,105	103,409	103,409
Allowance for Credit Losses on Loans	$ 108,513		108,513		165,105
Recoveries			7,415		7,004
Net Charge offs			(6,358)		(73,316)
Gross up of allowance for PCD loans at acquisition					293
Provision for credit losses			(50,233)		85,327
Balance at end of period	$ 108,513		$ 108,513		$ 165,105
Percent of Loans	1.37%		1.37%		2.14%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (13,773)		$ (80,320)
Net Charge offs			(6,358)		(73,316)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						152,330
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					469
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						48,921
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Allowance for credit losses on loans
Balance at beginning of period			11,539	10,411	10,411
Allowance for Credit Losses on Loans	$ 12,331		12,331		11,539
Recoveries			115		147
Net Charge offs			115		(272)
Gross up of allowance for PCD loans at acquisition					890
Provision for credit losses			677		2,102
Balance at end of period	$ 12,331		$ 12,331		$ 11,539
Percent of Loans	1.40%		1.40%		1.28%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ 0		$ (419)
Net Charge offs			115		(272)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						8,560
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					259
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						(1,851)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Allowance for credit losses on loans
Balance at beginning of period			177,175	113,820	113,820
Allowance for Credit Losses on Loans	$ 120,970		120,970		177,175
Recoveries			7,530		7,151
Net Charge offs			(6,242)		(73,588)
Gross up of allowance for PCD loans at acquisition					1,183
Provision for credit losses			(49,963)		87,961
Balance at end of period	$ 120,970		$ 120,970		$ 177,175
Percent of Loans	1.35%		1.35%		1.89%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (13,773)		$ (80,739)
Net Charge offs			(6,242)		(73,588)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						160,890
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					728
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						47,070
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Allowance for credit losses on loans
Balance at beginning of period			94,071	41,044	41,044
Allowance for Credit Losses on Loans	$ 82,182		82,182		94,071
Recoveries			3,046		643
Net Charge offs			(11,293)		(22,277)
Gross up of allowance for PCD loans at acquisition					753
Provision for credit losses			(595)		71,792
Balance at end of period	$ 82,182		$ 82,182		$ 94,071
Percent of Loans	1.91%		1.91%		2.17%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (14,340)		$ (22,920)
Net Charge offs			(11,293)		(22,277)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						43,331
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					474
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						2,287
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Allowance for credit losses on loans
Balance at beginning of period			78,080	32,447	32,447
Allowance for Credit Losses on Loans	$ 56,441		56,441		78,080
Recoveries			74		49
Net Charge offs			69		31
Gross up of allowance for PCD loans at acquisition					435
Provision for credit losses			(21,709)		18,816
Balance at end of period	$ 56,441		$ 56,441		$ 78,080
Percent of Loans	3.08%		3.08%		4.24%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (5)		$ (19)
Net Charge offs			69		31
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						58,261
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					537
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						25,814
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Allowance for credit losses on loans
Balance at beginning of period			172,152	73,490	73,490
Allowance for Credit Losses on Loans	$ 138,623		138,623		172,152
Recoveries			3,120		692
Net Charge offs			(11,224)		(22,246)
Gross up of allowance for PCD loans at acquisition					1,188
Provision for credit losses			(22,304)		90,608
Balance at end of period	$ 138,623		$ 138,623		$ 172,152
Percent of Loans	2.26%		2.26%		2.78%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (14,344)		$ (22,938)
Net Charge offs			(11,224)		(22,246)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						101,591
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					1,011
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						28,101
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Allowance for credit losses on loans
Balance at beginning of period			349,327	187,311	187,311
Allowance for Credit Losses on Loans	$ 259,593		259,593		349,327
Recoveries			10,650		7,844
Net Charge offs			(17,467)		(95,834)
Gross up of allowance for PCD loans at acquisition					2,371
Provision for credit losses			(72,267)		178,569
Balance at end of period	$ 259,593		$ 259,593		$ 349,327
Percent of Loans	1.72%		1.72%		2.25%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (28,117)		$ (103,677)
Net Charge offs			(17,467)		(95,834)
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						262,482
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					1,739
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						75,171
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Allowance for credit losses on loans
Balance at beginning of period			42,996	16,960	16,960
Allowance for Credit Losses on Loans	$ 41,620		41,620		42,996
Recoveries			700		500
Net Charge offs			(32)		(1,367)
Gross up of allowance for PCD loans at acquisition					651
Provision for credit losses			(1,344)		(6,864)
Balance at end of period	$ 41,620		$ 41,620		$ 42,996
Percent of Loans	0.55%		0.55%		0.55%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (732)		$ (1,867)
Net Charge offs			(32)		(1,367)
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						50,175
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					403
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						33,215
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Allowance for credit losses on loans
Balance at beginning of period			21,967	11,964	11,964
Allowance for Credit Losses on Loans	$ 17,348		17,348		21,967
Recoveries			2,240		1,978
Net Charge offs			1,640		259
Gross up of allowance for PCD loans at acquisition					422
Provision for credit losses			(6,259)		(5,358)
Balance at end of period	$ 17,348		$ 17,348		$ 21,967
Percent of Loans	2.85%		2.85%		3.11%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (600)		$ (1,719)
Net Charge offs			1,640		259
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						26,204
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					440
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						14,240
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Allowance for credit losses on loans
Balance at beginning of period			17,187	7,044	7,044
Allowance for Credit Losses on Loans					17,187
Recoveries					1,101
Net Charge offs					(3,689)
Gross up of allowance for PCD loans at acquisition					61
Provision for credit losses					5,111
Balance at end of period					$ 17,187
Percent of Loans					5.49%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs					$ (4,790)
Net Charge offs					(3,689)
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a) | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						15,564
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a) | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					140
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer(a) | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						8,520
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			965
Net Charge offs			(1,366)
Allowance for credit losses on loans
Balance at beginning of period			17,013
Allowance for Credit Losses on Loans	$ 13,591		13,591		17,013
Recoveries			965
Net Charge offs			(1,366)
Provision for credit losses			(2,056)
Balance at end of period	$ 13,591		$ 13,591		17,013
Percent of Loans	4.61%		4.61%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (2,331)
Net Charge offs			(1,366)
Allowance for Loans Losses and Unfunded Commitments [Member] | Auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			24
Net Charge offs			20
Allowance for credit losses on loans
Balance at beginning of period			174
Allowance for Credit Losses on Loans	$ 120		120		174
Recoveries			24
Net Charge offs			20
Provision for credit losses			(74)
Balance at end of period	$ 120		$ 120		174
Percent of Loans	1.79%		1.79%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (4)
Net Charge offs			20
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Allowance for credit losses on loans
Balance at beginning of period			82,150	$ 35,968	35,968
Allowance for Credit Losses on Loans	$ 72,679		72,679		82,150
Recoveries			3,928		3,579
Net Charge offs			262		(4,797)
Gross up of allowance for PCD loans at acquisition					1,134
Provision for credit losses			(9,733)		(7,112)
Balance at end of period	$ 72,679		$ 72,679		$ 82,150
Percent of Loans	0.85%		0.85%		0.92%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			$ (3,667)		$ (8,376)
Net Charge offs			$ 262		(4,797)
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						91,943
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses					$ 983
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						$ 55,975

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Loans Information [Line Items]
Interest receivable	$ 79,011		$ 79,011		$ 90,263
Financing Receivable, Nonaccrual, Interest Income	91	$ 1,000	329	$ 2,000
Financing Receivable, Troubled Debt Restructuring, Premodification			13,744	$ 9,280
Restructured Loans Subsequently Accruing	7,000		7,000
Ytd Restructured Loans Still On Nonaccrual	7,000		7,000
Loans and Finance Receivables [Member]
Loans Information [Line Items]
Interest receivable	$ 57,000		57,000		66,000
Possible Liquidity Issues [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring, Premodification			17,000
Financing Receivable, Troubled Debt Restructuring					$ 68,000
Possible Liquidity Issues [Member] | Commercial And Industrial Financing Receivable [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring, Premodification			$ 17,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Summary of core deposit intangibles and other intangibles
Other intangible amortization	$ 2,203	$ 2,253	$ 6,642	$ 7,939
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of period					$ 88,109	$ 80,730
Additions during the period			0		7,379
Accumulated amortization	(27,814)		(27,814)		(21,205)
Net book value	60,296		60,296		66,904
Other intangible amortization			6,608		8,749
Other Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of period					2,000	$ 38,970
Additions during the period			0		200
Accumulated amortization	(683)		(683)		(20,385)
Net book value	$ 0		0		1,350
Other intangible amortization			33		1,443
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Summary of core deposit intangibles and other intangibles
Reductions due to sale			$ (1,317)		$ (17,435)

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$ 59,967	$ 67,607
Additions from acquisition	0	1,357
Additions	11,761	13,667
Amortization	(15,624)	(22,664)
Mortgage servicing rights at end of period	56,104	59,967
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period	(18,006)	(302)
(Additions) recoveries, net	12,231	(17,704)
Valuation allowance at end of period	(5,775)	(18,006)
Mortgage servicing rights, net	50,329	41,961
Fair value of mortgage servicing rights	50,373	41,990
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,057,130	$ 7,743,956
Mortgage servicing rights, net to servicing portfolio	0.71%	0.54%
Mortgage servicing rights expense(a)	$ 3,393	$ 40,369

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Core Deposit Intangibles
Estimated future amortization expense
Three Months Ending December 31, 2021	$ 2,203
Year ending December 31, 2022	8,811
Year ending December 31, 2023	8,811
Year ending December 31, 2024	8,811
Year ending December 31, 2025	8,811
Year ending December 31, 2026	8,811
Beyond 2026	14,038
Net book value	60,296	$ 66,904
Other Intangibles
Estimated future amortization expense
Net book value	0	$ 1,350
Mortgage Servicing Rights
Estimated future amortization expense
Three Months Ending December 31, 2021	2,945
Year ending December 31, 2022	10,898
Year ending December 31, 2023	8,500
Year ending December 31, 2024	6,795
Year ending December 31, 2025	5,499
Year ending December 31, 2026	4,489
Beyond 2026	16,978
Net book value	$ 56,104

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Details Textuals) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	$ (12,231)	$ 17,704
Goodwill [Line Items]
Goodwill	1,104,992	1,109,300
Whitnell
Goodwill [Line Items]
Goodwill			$ (4,000)
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Goodwill [Line Items]
Decrease of other intangible assets	$ 1,317	$ 17,435

Short and Long-Term Funding, FH

Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Short-term Funding [Abstract]
Federal funds purchased	$ 415	$ 7,070
Securities sold under agreements to repurchase	267,528	185,901
Federal funds purchased and securities sold under agreements to repurchase	267,943	192,971
Commercial paper	54,553	59,346
Total short-term funding	322,496	252,317
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
Finance lease liability	72	1,128
Capitalized costs	(912)	(1,663)
FHLB Advances - long-term
FHLB advances	1,620,880	1,632,723
Other long-term funding	1,870,040	2,182,188
Total short and long-term funding	2,192,536	2,434,505
Bank senior notes, at par, due 2021
Long-Term Funding
Senior notes	$ 0	$ 300,000

Short and Long-Term Funding (Re

Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 267,528	$ 185,901
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	267,528	185,901
Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	267,528	185,901
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	267,528	185,901
Agency mortgage-related securities | Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | 30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 0	$ 0

Short and Long-Term Funding (Lo

Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Thousands	Jul. 13, 2021	Aug. 13, 2018	Nov. 30, 2014	Sep. 30, 2021	Dec. 31, 2020
Long-Term Funding
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed				$ 364,000
Fixed Interest Rates, Finance Leases				1.07%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances				$ 1,620,880	$ 1,632,723
Two Thousand Eighteen Senior Notes [Member] [Domain]
Long-Term Funding
Debt Instrument, Issuance Date Month, Year		August 2018
New Senior Debt Issued		$ 300,000
Debt Instrument, Maturity Date Month, Year		August 2021
Debt Instrument Call Date Earliest Month Year	July 2021
Debt Instrument, Redemption	Jul. 13, 2021
Debt Instrument, Interest Rate, Stated Percentage		3.50%
Two Thousand Fourteen Subordinated Notes
Long-Term Funding
Debt Instrument, Issuance Date Month, Year			November 2014
Junior Subordinated Debentures Issued			$ 250,000
Debt Instrument, Term			10 years
Debt Instrument, Maturity Date Month, Year			January 2025
Debt Instrument Call Date Earliest Month Year			October 2024
Subordinated Borrowing, Interest Rate			4.25%

Derivative and Hedging Activi_3

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 3
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	$ 972	$ 0
Derivatives (trading liabilities)	0	2,046
Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments and Forward Commitments Total | Fair Value, Measurements, Recurring
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	6,159	9,624
Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror | Fair Value, Measurements, Recurring
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	110,898	192,518
Derivatives (trading liabilities)	24,322	25,680
Fair Value, Inputs, Level 2 | Interest rate lock commitments (mortgage) | Fair Value, Measurements, Recurring
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	4,637	4,909
Derivatives (trading liabilities)	4,454	4,836
Fair Value, Inputs, Level 2 | Commodity contracts | Fair Value, Measurements, Recurring
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	6,546	12,486
Derivatives (trading liabilities)	6,471	11,155
Asset
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other assets), fair value	128,240	219,537
Less: Legally enforceable master netting agreements	3,302	1,936
Less: Cash collateral pledged/received	3,143	10,879
Derivative Asset	121,795	206,722
Liability
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other liabilities), fair value	35,247	43,716
Less: Legally enforceable master netting agreements	3,302	1,936
Less: Cash collateral pledged/received	18,595	25,625
Derivatives (trading liabilities)	13,351	16,155
Not designated as hedging instruments | Asset | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	3,889,911	3,639,679
Not designated as hedging instruments | Asset | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	496,215	411,292
Not designated as hedging instruments | Asset | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	16,231	87,547
Not designated as hedging instruments | Asset | Mortgage banking(a)(b)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	253,663	226,818
Not designated as hedging instruments | Liability | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	3,889,911	3,639,679
Not designated as hedging instruments | Liability | Interest rate lock commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	483,949	398,890
Not designated as hedging instruments | Liability | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	16,307	83,214
Not designated as hedging instruments | Liability | Mortgage banking(a)(b)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 390,000	$ 335,500

Derivative and Hedging Activi_4

Derivative and Hedging Activities Income impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (292)	$ (481)	$ (1,128)	$ (1,345)
Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0	0	(262)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(292)	(481)	(1,128)	(1,345)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0	$ 0	$ 0	$ (262)

Derivative and Hedging Activi_5

Derivative and Hedging Activities Derivative Impact on Perfomance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Inputs, Level 3
Derivative Instruments
Derivative Asset	$ 972		$ 972		$ 0
Interest Rate Lock Commitments and Forward Commitments Total | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Derivative Instruments
Derivative Asset	6,159		6,159		$ 9,624
Capital markets, net | Interest rate-related instruments — customer and mirror, net
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	557	$ 507	2,546	$ (2,648)
Capital markets, net | Foreign currency exchange forwards
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(8)	49	109	(31)
Capital markets, net | Commodity contracts
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(124)	(86)	(1,256)	555
Mortgage banking, net | Interest rate lock commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(1,356)	(4,948)	(4,438)	5,361
Mortgage banking, net | Forward commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (1,402)	$ 1,293	$ (3,017)	$ 710

Derivative and Hedging Activi_6

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Recording of Fair Value Hedge [Line Items]
Additional Collateral, Aggregate Fair Value	$ 78	$ 72
Derivative collateral right to reclaim cash	18	$ 31
Designated as Hedging Instrument
Balance Sheet Recording of Fair Value Hedge [Line Items]
Derivative Liability Notional Amount, Terminated			$ 500
Underlying Hedged Asset, Amortized Cost Basis	446
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 2

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts Recognized	$ 6,719	$ 13,441
Derivative Liabilities Offset	(3,302)	(1,936)
Derivative Asset, Collateral, Obligation to Return Cash, Offset	(3,143)	(10,879)
Net Amounts Presented on the Consolidated Balance Sheets	273	626
Derivative liabilities
Gross Amounts Recognized	23,489	27,951
Derivative Liability, Fair Value, Gross Asset	(3,302)	(1,936)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(18,595)	(25,625)
Net Amounts Presented on the Consolidated Balance Sheets	$ 1,592	$ 390

Commitments, Off-Balance Shee_3

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 0	$ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
Summary of lending-related and other commitments
Lending related commitments	10,618,161	10,010,492
Commercial letters of credit(a)
Summary of lending-related and other commitments
Lending related commitments	6,309	3,642
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	264,123	278,798
Standby letters of credit, fair value	$ 3,000	$ 3,000

Commitment, Changes in the Allo

Commitment, Changes in the Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 47,776	$ 21,907
Off-Balance Sheet, Credit Loss, Liability	41,276	47,776
Provision for credit losses	(6,500)	7,000
Balance at end of period	$ 41,276	47,776
Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability			$ 40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses		$ 179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability			$ 18,690

Commitments, Off-Balance Shee_4

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 41,276,000			$ 41,276,000		$ 47,776,000	$ 21,907,000
Provision for credit losses				(6,500,000)		7,000,000
Expense Related to Qualified Affordable Housing Projects	8,000,000		$ 6,000,000	24,000,000	$ 18,000,000
Remaining Investment in Qualified Affordable Housing Projects	270,000,000			270,000,000		268,000,000
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount	101,000,000			101,000,000		118,000,000
Qualified Affordable Housing Investments, Impairment Loss				0		0
Loans Repurchased Under Make Whole Requests	6,000,000			$ 6,000,000		10,000,000
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid		no		114
Loans Sold To Outside Investors Original Amount	15,700,000,000			$ 15,700,000,000
Loans Sold To Outside Investors Remaining Outstanding Amount	6,500,000,000			6,500,000,000
Mortgage Repurchase Reserve	1,000,000			1,000,000		2,000,000
Residential Mortgage Loans Sold With Recourse Risk	27,000,000			27,000,000		36,000,000
Residential Mortgage Loans Sold With Credit Recourse Risk	26,000,000			26,000,000		33,000,000
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	277,000,000			277,000,000		272,000,000
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	$ 24,000,000			$ 24,000,000		$ 25,000,000

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 3,893,379	$ 3,085,441
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	123,981	26,531
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,769,399	3,058,910
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	972	0
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	2,046
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Assets, Fair Value Disclosure [Abstract]
Trading assets	972	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Available-for-sale Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	123,981	26,531
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	4,109	1,661
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	212,797	327,189
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	7,179	8,584
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	2,999	3,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Available-for-sale Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,769,399	3,058,910
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential loans held for sale
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	158,202	129,158
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror, net
Assets, Fair Value Disclosure [Abstract]
Trading assets	110,898	192,518
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	24,322	25,680
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Assets, Fair Value Disclosure [Abstract]
Trading assets	4,637	4,909
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	4,454	4,836
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading assets	6,546	12,486
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	6,471	11,155
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities | Private-label Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	76,033	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Mortgage banking(a)(b)
Assets, Fair Value Disclosure [Abstract]
Trading assets	5,187
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments and Forward Commitments Total
Assets, Fair Value Disclosure [Abstract]
Trading assets	6,159	9,624
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	353,175	22,904
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	2,377,408	1,461,241
Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	231,096	524,756
Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	79,696	235,537
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	123,981	26,531
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities		26,531
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	414,020	450,662
Agency Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	14,998	25,038
US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 7,179
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities		$ 8,584

Fair Value Measurements Financi

Fair Value Measurements Financial Instruments Classified Within Level 3 (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Interest rate lock commitments to originate residential mortgage loans held for sale
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ 9,624	$ 2,527
New production	45,586	72,659
Closed loans / settlements	(44,543)	(76,001)
Other	(5,481)	10,439
Mortgage derivative gain (loss)	(4,437)	7,097
Ending Balance	5,187	9,624
Forward commitments to sell residential mortgage loans
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	2,046	710
New production	(2,496)	(3,505)
Closed loans / settlements	217	(12,587)
Other	(739)	17,427
Mortgage derivative gain (loss)	(3,017)	1,335
Ending Balance	(972)	2,046
Total derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	7,579	1,817
New production	48,082	76,164
Closed loans / settlements	(44,760)	(63,414)
Other	(4,742)	(6,988)
Mortgage derivative gain (loss)	(1,420)	5,762
Ending Balance	$ 6,159	$ 7,579

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2020	$ 13,000
Additions	552
Equity Securities without Readily Determinable Fair Value, Sales, Annual Amount	(33)
Equity Securities without Readily Determinable Fair Value, Donations, Annual Amount	(134)
Carrying value as of September 30, 2021	14,000
Fair Value, Inputs, Level 3
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2020	13,444
Carrying value as of September 30, 2021	13,830
Cumulative upward carrying value changes between January 1, 2018 and September 30, 2021	13,444
Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2021	$ 0

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ (12,231)	$ 18,481
Mortgage servicing rights	50,373		$ 41,990
Equity securities	14,000		13,000
Investment securities gains (losses), net	17,939		15,106
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity securities	13,830		13,444
Investment securities gains (losses), net	13,830		13,444
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount	6,449		3,747
OREO(b)	21,847		6,125
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Individually evaluated loans(a)	78,139		138,752
Provision for credit losses	(4,227)		97,519
Mortgage Servicing Rights (MSR) Impairment (Recovery)	12,231		(17,704)
Mortgage servicing rights	$ 50,373		$ 41,990

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Unobservable Level 3 Measurements (Details) - Fair Value, Inputs, Level 3	9 Months Ended
	Sep. 30, 2021
Discounted Cash Flow | Mortgage Servicing Rights | Minimum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	8.00%
Discounted Cash Flow | Mortgage Servicing Rights | Maximum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	15.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	40.00%
Discounted Cash Flow | Mortgage Servicing Rights | Weighted Average [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	15.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable | Minimum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	33.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable | Maximum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	51.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable | Weighted Average [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	36.00%

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets
Cash and due from banks	$ 378,927	$ 416,154
Interest-bearing deposits in other financial institutions	1,281,916	298,759
Federal funds sold and securities purchased under agreements to resell	25,000	1,135
Available-for-sale Securities	3,893,379	3,085,441
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,929,783	1,879,005
Investment securities held to maturity, fair value	2,035,858	2,028,943
Equity securities with readily determinable fair values, Fair Value	4,000	2,000
Equity Securities without Readily Determinable Fair Value, Amount	14,000	13,000
Investment securities gains (losses), net	17,939	15,106
FHLB and Federal Reserve Bank stocks	168,281	168,280
Residential loans held for sale	158,202	129,158
Loans, net	23,330,676	24,068,022
Bank owned life insurance, fair value	683,610	679,647
Financial liabilities
Short-term funding	322,496	252,317
FHLB advances	1,620,880	1,632,723
Letters of Credit Outstanding, Amount	264,000	279,000
Other long-term funding	1,870,040	2,182,188
US Treasury Securities
Financial assets
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Investment securities held to maturity, fair value	1,007	1,024
Fair Value, Inputs, Level 1
Financial assets
Available-for-sale Securities	123,981	26,531
Investment securities available for sale, fair value	123,981	26,531
Equity securities with readily determinable fair value, Carrying Amount	4,109	1,661
Equity securities with readily determinable fair values, Fair Value	4,109	1,661
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US Treasury Securities
Financial assets
Available-for-sale Securities	123,981	26,531
Fair Value, Inputs, Level 2
Financial assets
Available-for-sale Securities	3,769,399	3,058,910
Investment securities available for sale, fair value	3,769,399	3,058,910
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,928,735	1,877,939
Investment securities held to maturity, fair value	2,034,803	2,027,852
Financial liabilities
Brokered CDs and other time deposits	1,410,886	1,757,030
Brokered CDs and other time deposits, fair value	1,412,950	1,766,200
Short-term funding	322,496	252,317
Short-term funding, fair value	322,486	252,303
Long-term funding, fair value	270,526	578,233
Advances, Fair Value Disclosure	1,701,512	1,760,727
Standby letters of credit	2,549	2,731
Standby letters of credit, fair value	2,549	2,731
Other long-term funding	249,160	549,465
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Treasury Securities
Financial assets
Available-for-sale Securities		26,531
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	122,082	209,913
Derivatives (trading and other assets), fair value	122,082	209,913
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	35,247	41,671
Derivatives (trading and other liabilities), fair value	35,247	41,671
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	13,830	13,444
Investment securities gains (losses), net	13,830	13,444
Loans, net, fair value	23,447,728	24,012,738
Derivative Asset	972	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	26,440,380	24,725,451
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	26,440,380	24,725,451
Derivatives (trading liabilities)	0	2,046
Fair Value, Inputs, Level 3 | Mortgage banking(a)(b) | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	5,187
Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments and Forward Commitments Total | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	$ 6,159	$ 9,624

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals)	9 Months Ended
	Sep. 30, 2021
Fair Value Measurements (Textuals) [Abstract]
Fair Value Inputs Closing Ratio	82.00%

Retirement Plans, Components of

Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
RAP
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,684	$ 1,853	$ 5,835	$ 6,183
Interest cost	1,682	2,124	4,927	6,139
Expected return on plan assets	(6,395)	(6,386)	(19,256)	(19,196)
Amortization of prior service cost	(19)	(18)	(55)	(55)
Amortization of actuarial loss (gain)	1,346	1,313	3,446	2,923
Total net periodic pension cost	(1,701)	(1,114)	(5,103)	(4,006)
Postretirement Plan
Net period benefit cost for the pension and postretirement plans
Interest cost	13	20	39	59
Amortization of prior service cost	(19)	(19)	(56)	(56)
Total net periodic pension cost	$ (6)	$ 1	$ (17)	$ 2

Retirement Plans (Details Textu

Retirement Plans (Details Textuals) (Details) - USD ($) $ in Millions	Feb. 15, 2020	Feb. 14, 2020	Sep. 30, 2021	Sep. 30, 2020
First Staunton Bancshares [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effective Date of Acquisition		Feb. 14, 2020
Business Acquisition, Effective Date of Retirement Eligibility	Feb. 15, 2020
RAP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Description			The Corporation has a noncontributory defined benefit RAP, covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes.
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 0	$ 0

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Income Statement Data Abstract
Net interest income	$ 183,675			$ 182,150			$ 539,092	$ 574,964
Net intersegment interest income (expense)	0			0			0	0
Segment net interest income	183,675			182,150			539,092	574,964
Noninterest income(a)	82,076			75,545			250,862	428,342
Total revenue	265,752			257,695			789,954	1,003,305
Provision for credit losses	(24,010)			43,009			(82,018)	157,009
Noninterest expense	177,892			227,587			527,713	603,184
Income (loss) before income taxes	111,870			(12,900)			344,259	243,112
Income tax expense (benefit)	23,060			(58,114)			70,142	3,342
Net income	88,809	$ 91,007	$ 94,301	45,214	$ 148,718	$ 45,838	274,117	239,769
Segment Balance Sheet Data
Allocated goodwill							1,104,992	1,107,902
Loss on prepayments of FHLB advances	0			44,650			0
Risk Management and Shared Services
Segment Balance Sheet Data
Loss on prepayments of FHLB advances							44,650
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	93,768			92,033			280,295	298,611
Net intersegment interest income (expense)	5,884			6,937			18,962	3,123
Segment net interest income	99,652			98,970			299,257	301,734
Noninterest income(a)	43,228			37,405			124,847	111,254
Total revenue	142,881			136,376			424,104	412,987
Provision for credit losses	14,864			15,572			48,803	41,456
Noninterest expense	58,652			52,635			172,781	160,899
Income (loss) before income taxes	69,364			68,169			202,521	210,633
Income tax expense (benefit)	12,617			12,497			37,213	39,161
Net income	56,747			55,672			165,307	171,472
Segment Balance Sheet Data
Allocated goodwill							525,836	530,144
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	70,860			73,644			209,285	221,691
Net intersegment interest income (expense)	12,907			9,231			39,705	42,213
Segment net interest income	83,767			82,875			248,990	263,904
Noninterest income(a)	35,771			32,958			113,558	140,442
Total revenue	119,538			115,833			362,548	404,345
Provision for credit losses	4,233			5,758			13,897	16,296
Noninterest expense	94,762			102,139			290,443	335,675
Income (loss) before income taxes	20,543			7,936			58,209	52,374
Income tax expense (benefit)	4,314			1,667			12,224	10,999
Net income	16,230			6,269			45,985	41,376
Segment Balance Sheet Data
Allocated goodwill							579,156	577,758
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	19,047			16,472			49,511	54,662
Net intersegment interest income (expense)	(18,791)			(16,167)			(58,666)	(45,336)
Segment net interest income	256			305			(9,155)	9,326
Noninterest income(a)	3,077			5,182			12,457	176,646
Total revenue	3,333			5,487			3,301	185,973
Provision for credit losses	(43,107)			21,679			(144,717)	99,257
Noninterest expense	24,478			72,813			64,490	106,610
Income (loss) before income taxes	21,962			(89,005)			83,529	(19,895)
Income tax expense (benefit)	6,129			(72,278)			20,705	(46,817)
Net income	$ 15,833			$ (16,727)			62,824	26,922
Segment Balance Sheet Data
Allocated goodwill							$ 0	$ 0

Segment Reporting (Details Text

Segment Reporting (Details Textuals) $ in Millions	Jun. 30, 2020USD ($)	Mar. 31, 2021USD ($)	Sep. 30, 2021USD ($)segment
Segment Reporting [Abstract]
Number of Reportable Segments | segment			3
Whitnell
Segment Reporting [Abstract]
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax		$ 2	$ 2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax		$ 2	$ 2
ABRC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax book gain on sale	$ 163

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ 12,618				$ 12,618
Investment securities losses (gains), net	$ 0			$ 0			(437)	$ (90)
Personnel expense	(107,880)			(108,567)			(318,900)	(334,117)
Interest income	(172)			(1,296)			(1,335)	(2,628)
Other comprehensive income (loss)	(13,702)	$ 7,082	(16,811)	5,916	$ 15,054	$ 16,209	(23,431)	37,178
Ending Balance	(10,813)						(10,813)
Investment Securities AFS
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	30,076		41,325	34,101		3,989	41,325	3,989
Other comprehensive income (loss) before reclassifications	(19,827)			5,840			(35,829)	53,900
Investment securities losses (gains), net	0			(7)			16	(9,222)
Personnel expense	0			0			0	0
Other expense	0			0			0	0
Interest income	172			1,296			1,335	2,628
Income tax (expense) benefit	4,975			(1,786)			8,548	(11,852)
Other comprehensive income (loss)	(14,681)			5,342			(25,930)	35,454
Ending Balance	15,395	30,076		39,443	34,101		15,395	39,443
Defined Benefit Pension and Postretirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(27,187)		(28,707)	(36,021)		(37,172)	(28,707)	(37,172)
Other comprehensive income (loss) before reclassifications	0			0			0	0
Investment securities losses (gains), net	0			0			0	0
Personnel expense	(37)			(36)			(111)	(111)
Other expense	1,346			1,313			3,446	2,923
Interest income	0			0			0	0
Income tax (expense) benefit	(330)			(703)			(836)	(1,088)
Other comprehensive income (loss)	979			573			2,498	1,724
Ending Balance	(26,209)	(27,187)		(35,448)	(36,021)		(26,209)	(35,448)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	2,889		12,618	(1,920)		(33,183)	12,618	(33,183)
Other comprehensive income (loss) before reclassifications	(19,827)			5,840			(35,829)	53,900
Investment securities losses (gains), net	0			(7)			16	(9,222)
Personnel expense	(37)			(36)			(111)	(111)
Other expense	1,346			1,313			3,446	2,923
Interest income	172			1,296			1,335	2,628
Income tax (expense) benefit	4,644			(2,489)			7,712	(12,939)
Other comprehensive income (loss)	(13,702)	7,082	$ (16,811)	5,916	15,054	$ 16,209	(23,431)	37,178
Ending Balance	$ (10,813)	$ 2,889		$ 3,995	$ (1,920)		$ (10,813)	$ 3,995

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		$ 53,099		$ 49,243	$ 158,383	$ 187,524
Noninterest income (out-of-scope of Topic 606)(b)		28,977		26,303	92,479	240,818
Total noninterest income		82,076		75,545	250,862	428,342
Whitnell
Disaggregation of Revenue [Line Items]
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax			$ 2,000		2,000
ABRC
Disaggregation of Revenue [Line Items]
Pre-tax book gain on sale	$ 163,000
Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		22,110		21,152	67,229	62,884
Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		16,962		14,283	47,366	40,989
Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		11,147		10,207	31,920	28,736
Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		88		114	250	45,153
Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		2,792		3,487	11,618	9,764
Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		27,998		27,540	85,212	77,690
Noninterest income (out-of-scope of Topic 606)(b)		15,230		9,866	39,635	33,564
Corporate and Commercial Specialty | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		22,110		21,152	67,229	61,496
Corporate and Commercial Specialty | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		4,539		4,458	13,898	12,316
Corporate and Commercial Specialty | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		541		474	1,367	1,216
Corporate and Commercial Specialty | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		36		57	98	179
Corporate and Commercial Specialty | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		772		1,400	2,619	2,481
Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		25,012		21,739	71,583	109,713
Noninterest income (out-of-scope of Topic 606)(b)		10,758		11,219	41,976	30,728
Community, Consumer, and Business | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		0		0	0	1,387
Community, Consumer, and Business | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		12,417		9,816	33,441	28,653
Community, Consumer, and Business | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		10,600		9,699	30,538	27,392
Community, Consumer, and Business | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		50		55	146	44,965
Community, Consumer, and Business | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		1,945		2,168	7,459	7,315
Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		89		(36)	1,588	121
Noninterest income (out-of-scope of Topic 606)(b)		2,989		5,218	10,868	176,525
Risk Management and Shared Services | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		5		10	27	19
Risk Management and Shared Services | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		6		34	15	127
Risk Management and Shared Services | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		2		2	6	8
Risk Management and Shared Services | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)		76		(82)	1,540	(33)
Operating Segments [Member] | Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Total noninterest income		43,228		37,405	124,847	111,254
Operating Segments [Member] | Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Total noninterest income		35,771		32,958	113,558	140,442
Operating Segments [Member] | Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Total noninterest income		$ 3,077		$ 5,182	$ 12,457	$ 176,646

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease costs	$ 2,367	$ 3,970	$ 6,850	$ 9,224
Finance lease costs	17	39	76	115
Operating lease cash flows	2,858	2,871	8,598	8,303
Finance lease cash flows	$ 21	$ 40	$ 101	$ 82

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use asset	$ 29,527	$ 31,994
Finance lease right-of-use asset	59	962
Operating lease liability	33,066	36,425
Finance lease liability	$ 72	$ 1,128

Leases Operating Lease Informat

Leases Operating Lease Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Total lease payments	$ 36,696	$ 40,806
Operating Lease, Weighted Average Remaining Lease Term	5 years 11 months 19 days	6 years 5 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.21%	3.27%
Finance Lease, Liability, Payment, Due	$ 73	$ 1,145
Finance Lease, Weighted Average Remaining Lease Term	11 months 1 day	1 year 7 months 24 days
Finance Lease, Weighted Average Discount Rate, Percent	1.07%	1.05%
Equipment
Lessee, Lease, Description [Line Items]
Total lease payments	$ 192	$ 386
Operating Lease, Weighted Average Remaining Lease Term	1 year 8 months 26 days	2 years 5 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	0.46%	0.46%
Retail and corporate offices
Lessee, Lease, Description [Line Items]
Total lease payments	$ 30,756	$ 34,036
Operating Lease, Weighted Average Remaining Lease Term	5 years 6 months 18 days	6 years 14 days
Operating Lease, Weighted Average Discount Rate, Percent	3.24%	3.33%
Land
Lessee, Lease, Description [Line Items]
Total lease payments	$ 5,747	$ 6,385
Operating Lease, Weighted Average Remaining Lease Term	8 years 5 months 23 days	8 years 11 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.11%	3.09%
Finance Lease, Liability, Payment, Due	$ 73	$ 1,145
Finance Lease, Weighted Average Remaining Lease Term	11 months 1 day	1 year 7 months 24 days
Finance Lease, Weighted Average Discount Rate, Percent	1.07%	1.05%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Amortization of operating lease liabilities	Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Three Months Ending December 31, 2021 $ 2,326 $ 21 $ 2,348 2022 8,061 51 8,112 2023 6,108 — 6,108 2024 5,317 — 5,317 2025 4,076 — 4,076 Beyond 2025 10,807 — 10,807 Total lease payments $ 36,696 $ 73 $ 36,768 Less: interest 3,630 — 3,630 Present value of lease payments $ 33,066 $ 72 $ 33,138
Operating Leases
Three Months Ending December 31, 2021	$ 2,326
2021	8,061
2022	6,108
2023	5,317
2024	4,076
Beyond 2025	10,807
Total lease payments	36,696	$ 40,806
Less: interest	3,630
Present value of lease payments	33,066	36,425
Finance Leases
Three Months Ending December 31, 2021	21
2022	51
2023	0
2024	0
2025	0
Beyond 2025	0
Total lease payments	73	1,145
Less: interest	0
Present value of lease payments	72	$ 1,128
Total Leases
Three Months Ending December 31, 2021	2,348
2022	8,112
2023	6,108
2024	5,317
2025	4,076
Beyond 2025	10,807
Total lease payments	36,768
Less: interest	3,630
Present value of lease payments	$ 33,138

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Additional operating leases	$ 16	$ 17
Minimum
Lessee, Lease, Description [Line Items]
Operating lease terms	1 year
Additional operating lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease terms	41 years
Additional operating lease terms	6 years