Associated Banc-Corp (ASB) 10-Q 29 Oct 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 27, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
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		153,589,914
Entity Central Index Key	0000007789
Amendment Flag	false
Document Fiscal Year Focus	2020
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 C 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 6.125% Non-Cum. Perp Pref Stock, Srs C
Trading Symbol	ASB PrC
Security Exchange Name	NYSE
Series D 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 5.375% Non-Cum. Perp Pref Stock, Srs D
Trading Symbol	ASB PrD
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, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 401,151	$ 373,380
Interest-bearing deposits in other financial institutions	712,416	207,624
Federal funds sold and securities purchased under agreements to resell	95	7,740
Investment securities held to maturity, net, at amortized cost(a)	1,990,870	2,205,083
Investment securities available for sale, at fair value	3,258,360	3,262,586
Equity securities	15,090	15,090
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	168,280	227,347
Loans	25,003,753	22,821,440
Allowance for loan losses(a)	(384,711)	(201,371)
Loans, net	24,619,041	22,620,068
Bank and corporate owned life insurance	679,257	671,948
Tax credit and other investments	314,066	279,969
Premises and equipment, net	422,222	435,284
Goodwill	1,107,902	1,176,230
Mortgage servicing rights, net	45,261	67,306
Other intangible assets, net	70,507	88,301
Interest Receivable	91,612	91,196
Other assets	653,117	506,046
Total assets	34,698,746	32,386,478
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	7,489,048	5,450,709
Interest-bearing deposits	19,223,500	18,328,355
Total deposits	26,712,547	23,779,064
Federal funds purchased and securities sold under agreements to repurchase	155,329	433,097
Commercial paper	50,987	32,016
PPPLF	1,022,217	0
FHLB advances	1,706,763	3,180,967
Other long-term funding	549,201	549,343
Unfunded Commitments	57,276	21,907
Accrued expenses and other liabilities(a)	398,991	467,961
Total liabilities	30,653,313	28,464,355
Stockholders’ Equity
Preferred equity	353,637	256,716
Common stock	1,752	1,752
Surplus	1,717,186	1,716,431
Retained earnings(a)	2,424,992	2,380,867
Accumulated other comprehensive income (loss)	3,995	(33,183)
Treasury stock, at cost	(456,129)	(400,460)
Total common equity	3,691,796	3,665,407
Total stockholders’ equity	4,045,433	3,922,124
Total liabilities and stockholders’ equity	$ 34,698,746	$ 32,386,478
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	364,458	264,458
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	153,551,692	157,171,247
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01
Residential loans held for sale
Assets
Loans Receivable Held-for-sale, Amount	$ 130,139	$ 136,280
Loans	7,885,523	8,136,980
Commercial loans held for sale
Assets
Loans Receivable Held-for-sale, Amount	19,360	15,000
Loans	$ 16,041,154	13,481,275
Allowance for loan losses(a)		$ (166,846)

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Preferred shares, par value	$ 1		$ 1
Common shares, par value	$ 0.01		$ 0.01
Allowance for Unfunded Commitments	$ 57,276		$ 21,907
Retained Earnings (Accumulated Deficit)	2,424,992		2,380,867
Accounting Standards Update 2016-13
Retained Earnings (Accumulated Deficit)		$ 98,000
Deferred Income Tax Assets, Net		33,000
Cumulative Effect, Period Of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Unfunded Commitments		18,690
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Allowance for Unfunded Commitments	$ 57,276		$ 21,907
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period Of Adoption, Adjustment | Accounting Standards Update 2016-13
Allowance for Unfunded Commitments		$ 18,690

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income
Interest and fees on loans	$ 182,625	$ 248,579	$ 599,306	$ 768,216
Interest and dividends on investment securities
Taxable	13,689	23,485	50,064	79,248
Tax-exempt	14,523	14,491	44,021	42,950
Other interest	2,238	4,865	7,774	13,086
Total interest income	213,075	291,420	701,165	903,500
Interest expense
Interest on deposits	10,033	61,585	59,877	191,408
Interest on federal funds purchased and securities sold under agreements to repurchase	34	145	454	1,058
Interest on other short-term funding	5	30	46	113
Interest on PPPLF funding	899	0	1,574	0
Interest on FHLB advances	14,375	15,896	47,471	53,194
Interest on long-term funding	5,580	7,398	16,780	22,196
Total interest expense	30,925	85,054	126,201	267,969
Net interest income	182,150	206,365	574,964	635,532
Provision for credit losses	43,009	2,000	157,009	16,000
Net interest income after provision for credit losses	139,141	204,365	417,954	619,532
Noninterest income
Noninterest Income In Scope of Topic 606	49,243	72,414	187,521	217,853
Capital markets, net	7,222	4,300	22,067	12,215
Mortgage banking, net	12,636	10,940	31,043	25,118
Bank and corporate owned life insurance	3,074	4,337	9,793	11,482
Asset gains (losses), net(b)	(339)	877	156,945	2,316
Investment securities gains (losses), net	7	3,788	9,222	5,931
Other	2,232	2,537	7,321	8,344
Total noninterest income	75,545	100,850	428,342	287,890
Noninterest expense
Personnel	108,567	123,170	334,117	366,449
Technology	19,666	20,572	61,639	59,698
Occupancy	17,854	15,164	48,386	45,466
Business development and advertising	3,626	7,991	13,007	21,284
Equipment	5,399	6,335	16,150	17,580
Legal and professional	5,591	5,724	15,809	14,342
Loan and foreclosure costs	2,118	1,638	8,842	5,599
FDIC assessment	3,900	4,000	14,650	12,250
Other intangible amortization	2,253	2,686	7,939	7,237
Loss on prepayments of FHLB advances	44,650	0	44,650	0
Other	13,745	12,021	35,537	34,479
Total noninterest expense	227,587	200,930	603,184	590,380
Income (loss) before income taxes	(12,900)	104,286	243,112	317,042
Income tax expense (benefit)	(58,114)	20,947	3,342	62,356
Net income	45,214	83,339	239,769	254,686
Preferred stock dividends	5,207	3,801	13,152	11,402
Net income available to common equity	$ 40,007	$ 79,539	$ 226,618	$ 243,285
Earnings per common share
Basic	$ 0.26	$ 0.50	$ 1.47	$ 1.49
Diluted	$ 0.26	$ 0.49	$ 1.46	$ 1.48
Average common shares outstanding
Basic	152,440	159,126	153,175	161,727
Diluted	153,194	160,382	153,914	163,061
Series C Preferred Stock
Average common shares outstanding
Preferred Stock, Dividends, Per Share, Cash Paid	$ 0.3828125	$ 0.3828125
Series D Preferred Stock
Average common shares outstanding
Preferred Stock, Dividends, Per Share, Cash Paid	0.3359375	0.3359375
Series E Preferred Stock
Average common shares outstanding
Preferred Stock, Dividends, Per Share, Cash Paid	0.3671875	$ 0.3671875
Series F Preferred Stock
Average common shares outstanding
Preferred Stock, Dividends, Per Share, Cash Paid	$ 0.3515625
Huntington National Bank
Noninterest income
Related acquisition asset losses net of asset gains		less than $1 million		less than $1 million
Wealth management fees(a)
Noninterest income
Noninterest Income In Scope of Topic 606	$ 21,152	$ 21,015	$ 62,884	$ 61,885
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606	14,283	16,561	40,989	47,102
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606	10,207	10,501	28,735	29,973
Service charges and account fees	10,195	10,456	28,685	29,848
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606	3,487	3,383	9,763	9,490
Service charges and account fees	4,968	5,085	14,240	14,246
Insurance commissions and fess
Noninterest income
Noninterest Income In Scope of Topic 606	114	20,954	45,153	69,403
Risk Management and Shared Services
Noninterest expense
Loss on prepayments of FHLB advances			45,000
Risk Management and Shared Services | ABRC
Noninterest income
Asset gains (losses), net(b)			163,000
Operating Segments | Risk Management and Shared Services
Interest expense
Net interest income	16,472	21,528	54,662	65,834
Provision for credit losses	21,679	(14,879)	99,257	(35,359)
Noninterest income
Total noninterest income	5,182	7,245	176,646	15,472
Noninterest expense
Acquisition related costs(c)	218	1,629	2,457	5,995
Total noninterest expense	73,343	24,743	108,122	70,198
Income (loss) before income taxes	(89,535)	5,512	(21,407)	18,400
Income tax expense (benefit)	(72,389)	2,080	(47,135)	3,546
Net income	$ (17,146)	$ 3,432	$ 25,728	$ 14,854

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 45,214	$ 83,339	$ 239,769	$ 254,686
Investment securities available for sale
Net unrealized gains (losses)	5,840	33,173	53,900	123,139
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities	1,296	(8)	2,628	279
Reclassification adjustment for net losses (gains) realized in net income	(7)	(3,788)	(9,222)	(5,931)
Income tax (expense) benefit	(1,786)	(7,410)	(11,852)	(29,651)
Other comprehensive income (loss) on investment securities available for sale	5,342	21,967	35,454	87,836
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(36)	(36)	(111)	(111)
Amortization of actuarial loss (gain)	1,313	229	2,923	357
Income tax (expense) benefit	(703)	(49)	(1,088)	(62)
Other comprehensive income (loss) on pension and postretirement obligations	573	144	1,724	184
Total other comprehensive income (loss)	5,916	22,111	37,178	88,020
Comprehensive income	$ 51,130	$ 105,450	$ 276,948	$ 342,706

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period Of Adoption, Adjustment	Cumulative Effect, Period Of Adoption, Adjusted Balance	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, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period Of Adoption, Adjusted Balance	Surplus	SurplusCumulative Effect, Period Of Adoption, Adjusted Balance	Retained Earnings	Retained EarningsCumulative Effect, Period Of Adoption, Adjustment	Retained EarningsCumulative Effect, Period Of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period Of Adoption, Adjusted Balance	Treasury Stock	Treasury StockCumulative Effect, Period Of Adoption, Adjusted Balance	Treasury StockPerformance/Service Based RSAs, RSA,	Treasury StockBoard Authorized Purchase Program [Member]
Beginning balance at Dec. 31, 2018	$ 3,780,888									$ 256,716		$ 1,752		$ 1,712,615		$ 2,181,414			$ (124,972)		$ (246,638)
Comprehensive income
Net income	86,686															86,686
Other comprehensive income (loss)	21,597																		21,597
Comprehensive income	108,283
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	7,045													(32,220)		0					39,265
Purchase of treasury stock,				$ (7,468)	$ (29,999)																		$ (7,468)	$ (29,999)
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(28,183)															(28,183)
Preferred stock(a)	(3,801)															(3,801)
Stock-based compensation expense, net	9,397													9,397
Stockholders' Equity, Other	(293)															(293)
Ending balance at Mar. 31, 2019	3,835,870									256,716		1,752		1,689,792		2,235,824			(103,375)		(244,840)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid						$ 0.3828125	$ 0.3359375	$ 0.3671875
Beginning balance at Dec. 31, 2018	3,780,888									256,716		1,752		1,712,615		2,181,414			(124,972)		(246,638)
Comprehensive income
Net income	254,686
Other comprehensive income (loss)	88,020																		88,020
Comprehensive income	342,706
Ending balance at Sep. 30, 2019	3,920,855									256,716		1,752		1,713,971		2,341,158			(36,953)		(355,791)
Beginning balance at Mar. 31, 2019	3,835,870									256,716		1,752		1,689,792		2,235,824			(103,375)		(244,840)
Comprehensive income
Net income	84,661															84,661
Other comprehensive income (loss)	44,311																		44,311
Comprehensive income	128,972
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	827													(211)		0					1,038
Purchase of treasury stock,				(831)	(39,602)																		(831)	(39,602)
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,776)															(27,776)
Preferred stock(a)	(3,801)															(3,801)
Stock-based compensation expense, net	6,134													6,134
Ending balance at Jun. 30, 2019	3,899,794									256,716		1,752		1,695,715		2,288,909			(59,063)		(284,235)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid						0.3828125	0.3359375	0.3671875
Net income	83,339															83,339
Other comprehensive income (loss)	22,111																		22,111
Comprehensive income	105,450
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	1,198													12,561		0					(11,363)
Purchase of treasury stock,				(194)	(59,999)																		(194)	(59,999)
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,289)															(27,289)
Preferred stock(a)	(3,801)															(3,801)
Stock-based compensation expense, net	5,696													5,696
Ending balance at Sep. 30, 2019	3,920,855									256,716		1,752		1,713,971		2,341,158			(36,953)		(355,791)
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)															$ (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)							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)															$ (98,337)
Comprehensive income
Net income	239,769															239,769
Other comprehensive income (loss)	37,178																		37,178
Comprehensive income	276,948
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							(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)
Issuance of preferred stock	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							(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)
Issuance of preferred stock	(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

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Common Stock, Dividends, Per Share, Cash Paid	$ 0.18	$ 0.18	$ 0.18	$ 0.17	$ 0.17	$ 0.17

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash Flow From Operating Activities
Net income	$ 45,214	$ 45,838	$ 83,339	$ 86,686	$ 239,769	$ 254,686
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Provision for credit losses	43,009		2,000		157,009	16,000
Depreciation and amortization					38,707	43,704
Addition to (recovery of) valuation allowance on mortgage servicing rights, net					18,481	177
Amortization of mortgage servicing rights					16,416	8,749
Amortization of other intangible assets	2,253		2,686		7,939	7,237
Amortization and accretion on earning assets, funding, and other, net					21,748	17,607
Net amortization of tax credit investments					18,988	15,512
Losses (gains) on sales of investment securities, net					(9,222)	(5,931)
Asset (gains) losses, net					(156,945)	(2,316)
(Gain) loss on mortgage banking activities, net					(43,889)	(15,966)
Mortgage loans originated and acquired for sale					(1,319,034)	(824,289)
Proceeds from sales of mortgage loans held for sale					1,620,777	1,048,729
Changes in certain assets and liabilities
(Increase) decrease in interest receivable					(415)	2,476
Increase (decrease) in interest payable					(12,735)	589
Increase (decrease) in expense payable					(32,892)	(15,932)
(Increase) decrease in net derivative position					(133,165)	(109,948)
Increase (decrease) in unsettled trades					1,000	2,577
(Increase) decrease in net income tax position					(58,002)	33,770
Net change in other assets and other liabilities					48,525	(7,446)
Net cash provided by (used in) operating activities					423,060	469,986
Cash Flow From Investing Activities
Net increase in loans					(2,170,320)	(72,644)
Purchases of
Available for sale securities					(1,368,124)	(460,124)
Held to maturity securities					(109,824)	(322,590)
Federal Home Loan Bank and Federal Reserve Bank stocks					(84,152)	(214,554)
Premises, equipment, and software, net of disposals					(34,440)	(50,385)
Other intangibles					(200)	0
Proceeds from
Sales of available for sale securities					626,283	1,367,450
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks					144,000	257,646
Prepayments, calls, and maturities of available for sale investment securities					893,157	400,648
Prepayments, calls, and maturities of held to maturity investment securities					323,175	168,378
Sales, prepayments, calls, and maturities of other assets					18,457	6,674
Net change in tax credit and alternative investments					(35,630)	(50,117)
Net cash (paid) received in acquisition					(31,518)
Net cash (paid) received in acquisition						551,250
Net cash provided by (used in) investing activities					(1,572,625)	1,581,631
Cash Flow From Financing Activities
Net increase (decrease) in deposits					2,495,229	(1,200,004)
Net increase (decrease) in short-term funding					(284,655)	(48,630)
Net increase (decrease) in short-term FHLB advances					(520,000)	(685,000)
Repayment of long-term FHLB advances					(966,777)	(763,036)
Proceeds from long-term FHLB advances					4,000	751,573
Proceeds from PPPLF					1,022,217	0
Repayment of finance lease principal					(1,044)	0
Proceeds from issuance of preferred shares					96,921	0
Proceeds from issuance of common stock for stock-based compensation plans					3,165	9,070
Cash dividends on common stock					(84,156)	(83,248)
Cash dividends on preferred stock					(13,152)	(11,402)
Net cash provided by (used in) financing activities					1,674,484	(2,168,770)
Net increase (decrease) in cash, cash equivalents, and restricted cash					524,918	(117,154)
Cash, cash equivalents, and restricted cash at beginning of period		588,744		876,698	588,744	876,698	$ 876,698
Cash, cash equivalents, and restricted cash at end of period	1,113,663		759,545		1,113,663	759,545	588,744
Supplemental disclosures of cash flow information
Cash paid for interest					137,423	266,192
Cash paid for (received from) income and franchise taxes					17,682	38,979
Loans and bank premises transferred to OREO					12,599	7,374
Capitalized mortgage servicing rights					11,495	8,900
Loans transferred into held for sale from portfolio, net					260,856	326,476
Unsettled trades to purchase securities					1,000	2,577
Acquisition
Fair value of assets acquired, including cash and cash equivalents								$ 457,878	$ 695,848
Fair value ascribed to goodwill and intangible assets								22,150	29,837
Fair value of liabilities assumed								480,028	725,764
Equity issued in (adjustments related to) acquisition								0	(79)
Restricted Cash and Cash Equivalents
Cash and cash equivalents								1,113,663	562,798
Restricted cash								0	196,747
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	1,113,663	588,744	759,545	876,698	1,113,663	759,545	$ 876,698	$ 1,113,663	$ 759,545
Retained Earnings
Cash Flow From Operating Activities
Net income	$ 45,214	$ 45,838	$ 83,339	$ 86,686	239,769
ABRC
Proceeds from
Sales, prepayments, calls, and maturities of other assets					256,511	0
Performance/Service Based RSAs, RSA,
Cash Flow From Financing Activities
Payments for Repurchase of Common Stock					(6,010)	(8,493)
Board Authorized Purchase Program [Member]
Cash Flow From Financing Activities
Payments for Repurchase of Common Stock					$ (71,255)	$ (129,600)

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2020
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	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Acquisitions: 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 9 new Metro-East St. Louis communities. As a result of the acquisition and other consolidations, a net of 7 branch locations were added. The First Staunton acquisition constituted a business combination. The acquisition has been accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair value on the acquisition date. The determination of estimated fair values required management to make certain estimates that are subjective in nature and may require adjustments upon the availability of new information regarding facts and circumstances which existed at the date of acquisition (i.e., appraisals) for up to a year following the acquisition. The Corporation continues to review information relating to events or circumstances existing at the acquisition date. Management anticipates that this review could result in adjustments to the acquisition date valuation amounts presented herein but does not anticipate that these adjustments will be material. The Corporation recorded approximately $15 million in goodwill related to the First Staunton acquisition during the first quarter of 2020, however the Corporation subsequently reduced goodwill by $2 million during the second quarter of 2020. Upon review of information relating to events and circumstances existing at the acquisition date, and in accordance with applicable accounting guidance, the Corporation remeasured select previously reported fair value amounts. The adjustment to goodwill was driven by an update that increased the fair value of MSRs acquired. Goodwill created by the acquisition is not tax deductible. See Note 8 for additional information on goodwill, as well as the carrying amount and amortization of CDI assets related to the First Staunton acquisition. The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the First Staunton acquisition: ($ in Thousands) Purchase Accounting Adjustments February 14, 2020 Assets Cash and cash equivalents $ — $ 44,782 Investment securities available for sale (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 13,414 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 4,193 9,090 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. 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 There were no PCD securities. Huntington Wisconsin Branch Acquisition On June 14, 2019, the Corporation completed its acquisition of the Wisconsin branches of Huntington. The Corporation paid a 4% premium on acquired deposits. The conversion of the branches happened simultaneously with the close of the transaction and the acquisition expanded the Bank's presence into 13 new Wisconsin communities. As a result of the acquisition and other consolidations, a net of 14 branch locations were added. The Huntington branch acquisition constituted a business combination. The acquisition has been accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed, and consideration exchanged were recorded at estimated fair value on the acquisition date. The determination of estimated fair values required management to make certain estimates that are subjective in nature and may require adjustments upon the availability of new information regarding facts and circumstances which existed at the date of acquisition (i.e., appraisals) for up to a year following the acquisition. The Corporation recorded approximately $7 million in goodwill related to the Huntington branch acquisition during the second quarter of 2019 and approximately $210,000 during the third quarter of 2019. Upon review of information relating to events and circumstances existing at the acquisition date, and in accordance with applicable accounting guidance, the Corporation remeasured select previously reported fair value amounts. The adjustment to goodwill was driven by an update that decreased the fair value of furniture acquired. Goodwill created by the acquisition is tax deductible. See Note 8 for additional information on goodwill. The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Huntington branch acquisition: ($ in Thousands) Purchase Accounting Adjustments June 14, 2019 Assets Cash and cash equivalents $ — $ 551,250 Loans (1,552) 116,346 Premises and equipment, net 4,800 22,430 Goodwill 7,286 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 22,630 22,630 OREO (included in other assets on the face of the consolidated balance sheets) (2,561) 5,263 Other assets — 559 Total assets $ 725,764 Liabilities Deposits $ 156 $ 725,173 Other liabilities 70 590 Total liabilities $ 725,764 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 will be 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 are 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: Completed: Associated Benefits & Risk Consulting On June 30, 2020, the Corporation announced that it had closed the previously announced sale of ABRC to USI. Under the terms of the agreement, the purchase price was $266 million in cash. Associated recorded a second quarter 2020 pre-tax book gain of approximately $163 million in conjunction with the sale. Pending: During the third quarter of 2020, the Corporation announced branch sale transactions. With the continued migration to mobile and online channels along with declining foot traffic, the Corporation has a reduced need of branches in our distribution strategy. As a result of the pending sales, the Corporation transferred the related branch real estate to OREO and wrote the value down to fair value. On September 11, 2020, Associated Bank entered into a definitive agreement with Morton Community Bank to sell 5 branches in Peoria, IL. Under the terms of the transaction, Associated Bank expects to sell approximately $208 million in total deposits and no loans. Associated Bank will be receiving a 4% purchase premium on deposits transferred. The sale is expected to close in December 2020. With the sale of these branches, Associated Bank will exit the Peoria Community Market. On September 12, 2020, Associated Bank entered into an agreement with Royal Bank to sell 2 branches in southwest Wisconsin. Under the terms of the transaction, Associated Bank expects to sell approximately $56 million in total deposits and no loans. Associated Bank will be receiving a 4% purchase premium on deposits transferred in the Prairie du Chien and Richland Center branches. This sale is expected to close in December 2020.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
Summary of Significant Accounting Policies	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 2019 Annual Report on Form 10-K. As a result of adopting ASU 2016-13 Financial Instruments - Credit Losses (Topic 326) and strategic branch optimization initiatives, there have been changes to the Corporation's significant accounting policies since December 31, 2019, which are described below. Investment Securities Management measures expected credit losses on held to maturity securities on a collective basis by major security type. Accrued interest receivable on held to maturity securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts and is included in investment securities held to maturity, net on the consolidated balance sheets. For available for sale securities, the Corporation evaluates whether any decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses on investments is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses on investments is recognized in other comprehensive income. Changes in the allowance for credit losses on investments are recorded as provision for, or reversal of, credit loss expense. Losses are charged against the allowance when management believes the available for sale security is uncollectible or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on available for sale debt securities is excluded from the estimate of credit losses. Allowance for Credit Losses on Loans The level of the allowance for loan losses represents management's estimate of an amount appropriate to provide for lifetime credit losses in the loan portfolio at the balance sheet date. The methodology applied by the Corporation is designed to assess the appropriateness of the allowance for loan losses within the Corporation's loan segmentation as well as management’s ongoing review and grading of the loan portfolio into criticized loan categories. The methodology focuses on evaluation of several factors, including but not limited to: evaluation of facts and issues related to specific loans, management's ongoing review and grading of the loan portfolio using a dual risk rating system consisting of probability of default and loss given default models, which are based on loan grades for commercial loans and credit reports for consumer loans applied based on portfolio segmentation leveraging industry breakouts in Commercial and Industrial (C&I) and property types in Commercial Real Estate (CRE) for commercial loans and loan types for consumer loans, consideration of historical credit loss and delinquency experience on each portfolio category, trends in past due and nonaccrual loans, the level of potential problem loans, the risk characteristics of the various classifications of loans, changes in the size and character of the loan portfolio, concentrations of loans to specific borrowers or industries, existing economic conditions and economic forecasts, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect potential loan losses. The Corporation utilizes the Moody's Baseline economic forecast in the allowance model and applies that forecast over a reasonable and supportable period with reversion to historical losses. For additional detail on the reasonable and supportable period and reversion assumptions, see Note 7. The Company estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flow of the loans. Potential problem loans are generally defined by management to include loans rated as substandard by management. Assessing these numerous factors involves significant judgment. The provision for loan losses is predominantly a function of the result of the methodology and other qualitative and quantitative factors used to determine the allowance for loan losses. Management individually analyzes loans that do not share similar risk characteristics to other loans in the portfolio. Management has determined that commercial loan relationships that have nonaccrual status or commercial and retail loans that have had their terms restructured in a TDR meet this definition. Probable TDRs are loans the Corporation has reviewed individually to determine whether there is a high likelihood that the loans will default and will require restructuring in the near future. Probable TDRs could be classified as Pass, Special Mention, Potential Problem or Nonaccrual within the Corporation's credit quality analysis depending on the specific circumstances surrounding the individual credits. Accrued interest receivable on loans is excluded from the estimate of credit losses. The allowance for unfunded commitments leverages the same methodology utilized to measure the allowance for loan losses. The Corporation estimates expected credit losses over the contractual period in which the Corporation is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Corporation. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. See Note 7 for additional information on the ACLL and Note 12 for additional information on the allowance for unfunded commitments. A portion of the ACLL is comprised of adjustments for qualitative factors not reflected in the quantitative model. OREO OREO is included in other assets on the consolidated balance sheets and is comprised of property acquired through a foreclosure proceeding or acceptance of a deed-in-lieu of foreclosure, and loans classified as in-substance foreclosure. OREO is recorded at the fair value of the underlying property collateral, less estimated selling costs. This fair value becomes the new cost basis for the foreclosed asset. The initial write-down, if any, will be recorded as a charge off against the allowance for loan losses. Any subsequent write-downs to reflect current fair value, as well as gains and losses on disposition and revenues and expenses incurred in maintaining such properties, are expensed as incurred. OREO also includes bank premises formerly but no longer used for banking, property originally acquired for future expansion but no longer intended to be used for that purpose, and property currently held for sale. Banking premises are transferred at the lower of carrying value or fair value, less estimated selling costs and any write-down is expensed as incurred. Impact of adopting ASU 2016-13 Financial Instruments - Credit Losses (Topic 326) The following table illustrates the adoption impact: December 31, 2019 January 1, 2020 ($ in Thousands) Allowance for Loan Losses Allowance for Unfunded Commitments CECL Day 1 Adjustment ACLL Beginning Balance Commercial and industrial $ 91,133 $ 12,276 $ 48,921 $ 152,330 Commercial real estate - owner occupied 10,284 127 (1,851) 8,560 Commercial and business lending 101,417 12,403 47,070 160,890 Commercial real estate - investor 40,514 530 2,287 43,331 Real estate construction 24,915 7,532 25,814 58,261 Commercial real estate lending 65,428 8,062 28,101 101,591 Total Commercial 166,846 20,465 75,171 262,482 Residential mortgage 16,960 — 33,215 50,175 Home equity 10,926 1,038 14,240 26,204 Other consumer 6,639 405 8,520 15,564 Total consumer 34,525 1,443 55,975 91,943 Total loans $ 201,371 $ 21,907 $ 131,147 $ 354,425 The allowance for credit losses on held to maturity securities was approximately $61,000 at January 1, 2020, attributable entirely to the Corporation's municipal securities. At January 1, 2020, the adoption of ASU 2016-13 resulted in an increase to the allowance for loan losses of $112 million and an increase to the allowance for unfunded commitments of $19 million for a total increase to the ACLL of $131 million. A corresponding after tax decrease to common equity of $98 million was recorded along with a deferred tax asset of $33 million. New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The FASB issued an amendment to replace the current incurred loss impairment methodology. Under the new guidance, entities will be required to measure expected credit losses by utilizing forward-looking information to assess an entity's ACL. The guidance also requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. This amendment was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. ASU 2018-19 was issued to clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. ASU 2019-04 was issued and provided entities alternatives for measurement of accrued interest receivable, clarified the steps entities should take when recording the transfer of loans or debt securities between measurement classifications or categories and clarifies that entities should include expected recoveries on financial assets. ASU 2019-05 was issued to provide entities that have certain instruments within the scope of Subtopic 320-20 with an option to irrevocably elect the fair value option in Subtopic 825-10. ASU 2020-02 was issued to further explain the measurement of current expected credit losses and the development, governance, and documentation of a systematic methodology. 1st Quarter 2020 The Corporation has adopted the Update using a modified retrospective approach. The Corporation has developed a CECL allowance model which calculates reserves over the life of the loan and is largely driven by portfolio characteristics, risk-grading, economic outlook, and key methodology assumptions. Those assumptions are based upon the existing probability of default and loss given default framework. At adoption, the Corporation utilized a single economic forecast over a 2-year reasonable and supportable forecast period. In the second year, the Corporation used straight-line reversion to historical losses. The Corporation recorded a $131 million adjustment to the ACL related to the adoption of this standard, which includes $61 thousand related to the held to maturity investment securities portfolio. The Corporation has elected to maintain pools accounted for under Subtopic 310-30 at adoption. The Corporation has elected to utilize the 2019 Capital Transition Relief for initial adoption, as well as the 2020 Capital Transition Relief as permitted under applicable regulations. The total impact at adoption equates to an approximately 29 bp net, after tax, reduction in the tangible common equity ratio. Results for the periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards. ASU 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement The FASB issued an amendment to add, modify, and remove disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the FASB Concepts Statement "Conceptual Framework for Financial Reporting," including the consideration of costs and benefits. The amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. 1st Quarter 2020 The Corporation has evaluated and determined it has an immaterial impact with minor changes in presentation. ASU 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The FASB issued an amendment to simplify the subsequent quantitative measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment was effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Entities should apply the amendment prospectively. 1st Quarter 2020 There has been no material impact on results of operations, financial position, and liquidity. The Corporation performs its annual impairment testing in May. Standard Description Date of adoption Effect on financial statements ASU 2020-03 Codification Improvements to Financial Instruments The FASB issued an amendment to further clarify that all entities are required to provide the fair value option disclosures in paragraphs 825-10-50-24 through 50-32. The amendment also states that paragraphs 820-10-35-2A(g) and 820-10-35-18L are to include the phrase nonfinancial items accounted for as derivatives under Topic 815 to be consistent with the previous amendments to Section 820-10-35 that were made by ASU No. 2018-09, Codification Improvements. The amendment also clarifies that the disclosure requirements in Topic 320 apply to the disclosure requirements in Topic 942 for depository and lending institutions along with improving the understandability of the guidance relating to subtopic 470-50 and subtopic 820-10. Lastly, the amendment clarifies that the contractual term of a net investment in a lease determined in accordance with Topic 842 should be the contractual term used to measure expected credit losses under Topic 326 and that when an entity regains control of financial assets sold, an ACL should be recorded in accordance with Topic 326. 1st Quarter 2020 The Corporation has evaluated and determined it has an immaterial impact. ASU 2020-04 Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting The FASB issued an amendment to provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendment only applies to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. 1st Quarter 2020 The Corporation has evaluated the impact of the Update and determined the expedients provided allow for simpler, more streamlined modifications to the financial instruments referencing LIBOR. A small population of loans have been modified under the new standard. Future Accounting Pronouncements The expected impact of accounting pronouncements recently issued or proposed but not yet required to be adopted are displayed in the table below: Standard Description Date of anticipated adoption Effect on financial statements ASU 2018-14 The FASB issued an amendment to modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments also added requirements to disclose the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The amendment also clarifies the disclosure requirements in paragraph 715-20-50-3, which states that certain information for defined benefit pension plans should be disclosed. The amendments in this Update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The amendment is effective for fiscal years ending after December 15, 2020. Entities should apply the amendments in this Update on a retrospective basis to all periods presented. Early adoption is permitted. 1st Quarter 2021 The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity. ASU 2020-01 Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) The FASB issued an amendment to clarify the interaction of the accounting for equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain forward contracts and purchased options accounted for under Topic 815. The amendments clarify that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. The amendments also clarify that for the purpose of applying paragraph 815-10-15-141(a) an entity should not consider whether, upon the settlement of the forward contract or exercise of the purchased option, individually or with existing investments, the underlying securities would be accounted for under the equity method in Topic 323 or the fair value option in accordance with the financial instruments guidance in Topic 825. An entity also would evaluate the remaining characteristics in paragraph 815-10-15-141 to determine the accounting for those forward contracts and purchased options. 1st Quarter 2021 The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2020
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 September 30, Nine Months Ended September 30, (In Thousands, except per share data) 2020 2019 2020 2019 Net income $ 45,214 $ 83,339 $ 239,769 $ 254,686 Preferred stock dividends (5,207) (3,801) (13,152) (11,402) Net income available to common equity $ 40,007 $ 79,539 $ 226,618 $ 243,285 Common shareholder dividends (27,676) (27,091) (83,607) (82,741) Unvested share-based payment awards (199) (198) (549) (506) Undistributed earnings $ 12,133 $ 52,250 $ 142,462 $ 160,037 Undistributed earnings allocated to common shareholders $ 12,045 $ 51,870 $ 141,426 $ 158,970 Undistributed earnings allocated to unvested share-based payment awards 87 380 1,036 1,067 Undistributed earnings $ 12,133 $ 52,250 $ 142,462 $ 160,037 Basic Distributed earnings to common shareholders $ 27,676 $ 27,091 $ 83,607 $ 82,741 Undistributed earnings allocated to common shareholders 12,045 51,870 141,426 158,970 Total common shareholders earnings, basic $ 39,721 $ 78,961 $ 225,032 $ 241,711 Diluted Distributed earnings to common shareholders $ 27,676 $ 27,091 $ 83,607 $ 82,741 Undistributed earnings allocated to common shareholders 12,045 51,870 141,426 158,970 Total common shareholders earnings, diluted $ 39,721 $ 78,961 $ 225,032 $ 241,711 Weighted average common shares outstanding 152,440 159,126 153,175 161,727 Effect of dilutive common stock awards 754 1,256 739 1,334 Diluted weighted average common shares outstanding 153,194 160,382 153,914 163,061 Basic earnings per common share $ 0.26 $ 0.50 $ 1.47 $ 1.49 Diluted earnings per common share $ 0.26 $ 0.49 $ 1.46 $ 1.48 Non-dilutive common stock options of approximately 8 million and 3 million for the three months ended September 30, 2020 and 2019, respectively, and 7 million and 3 million for the nine months ended September 30, 2020 and 2019, respectively, were excluded from the earnings per common share calculation.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Stock-Based Compensation	Stock-Based Compensation The fair value of stock options granted is estimated on the date of grant using a Black-Scholes option pricing model, while the fair value of restricted stock awards is their fair market value on the date of grant. The fair values of stock options and restricted stock awards 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 following assumptions were used in estimating the fair value for options granted in the first nine months of 2020 and full year 2019: 2020 2019 Dividend yield 3.50 % 3.30 % Risk-free interest rate 1.60 % 2.60 % Weighted average expected volatility 21.00 % 24.00 % Weighted average expected life 5.75 years 5.75 years Weighted average per share fair value of options $2.39 $4.00 A summary of the Corporation’s stock option activity for the nine months ended September 30, 2020 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2019 5,543 $ 20.13 6.25 years $ 16,043 Granted 1,697 18.43 Exercised (117) 13.89 Forfeited or expired (306) 21.48 Outstanding at September 30, 2020 6,817 $ 19.75 6.47 years $ 18 Options Exercisable at September 30, 2020 4,203 $ 19.21 5.07 years $ 18 (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, 2020, the intrinsic value of stock options exercised was less than $1 million compared to $3 million for the nine months ended September 30, 2019. The total fair value of stock options vested was $4 million for both the nine months ended September 30, 2020 and 2019. The Corporation recognized compensation expense for the vesting of stock options of $3 million for the nine months ended September 30, 2020, compared to $4 million for the nine months ended September 30, 2019. Included in compensation expense for 2020 was approximately $2 million of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At September 30, 2020, the Corporation had approximately $4 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, 2020: Restricted Stock Awards Shares (a) Weighted Average Outstanding at December 31, 2019 2,393 $ 22.39 Granted 1,043 18.21 Vested (905) 22.64 Forfeited (146) 20.65 Outstanding at September 30, 2020 2,385 $ 20.56 (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 2019 and 2020 will vest ratably over a period of three years. Service-based restricted stock awards granted during 2019 and 2020 will vest ratably over a period of four years. Expense for restricted stock awards issued of approximately $15 million was recorded for the nine months ended September 30, 2020 and $18 million was recorded for the nine months ended September 30, 2019. Included in compensation expense for the first nine months of 2020 was approximately $6 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $18 million of unrecognized compensation costs related to restricted stock awards at September 30, 2020 that are expected to be recognized over the remaining requisite service periods that extend predominately through the first quarter of 2024. At the Corporation’s 2020 Annual Meeting of Shareholders held on April 28, 2020, the Corporation’s shareholders approved the Associated Banc-Corp 2020 Incentive Compensation Plan, which provides for various types of awards to the Company’s executive officers, employees, consultants and non-employee directors, including, among others, stock options, restricted stock, restricted stock units and performance units. The Corporation has the ability to issue shares from treasury or new shares upon the exercise of stock options or the granting of restricted stock awards. The Board of Directors has authorized management to repurchase shares of the Corporation’s common stock in the market, to be made available for issuance in connection with the Corporation’s employee incentive plans and for other corporate purposes. The repurchase of shares, if any, will be based on market and investment opportunities, capital levels, growth prospects, and regulatory constraints. Such repurchases may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs, or similar facilities. On March 13, 2020, the Corporation suspended its share repurchase program and expects the program to remain suspended for the remainder of 2020.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are classified as available for sale, held to maturity, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of securities available for sale and held to maturity at September 30, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities available for sale U. S. Treasury securities $ 26,541 $ 108 $ — $ 26,650 Agency securities 24,983 50 — 25,033 Obligations of state and political subdivisions (municipal securities) 450,174 24,521 — 474,695 Residential mortgage-related securities FNMA / FHLMC 1,267,003 9,554 (94) 1,276,463 GNMA 399,490 7,823 — 407,313 Commercial mortgage-related securities FNMA / FHLMC 19,724 2,153 — 21,877 GNMA 670,573 17,805 — 688,378 Asset backed securities FFELP 332,398 — (6,556) 325,843 SBA 9,159 — (48) 9,111 Other debt securities 3,000 — (3) 2,997 Total investment securities available for sale $ 3,203,046 $ 62,015 $ (6,701) $ 3,258,360 Investment securities held to maturity U. S. Treasury securities $ 999 $ 31 $ — $ 1,030 Obligations of state and political subdivisions (municipal securities) 1,444,325 115,343 (368) 1,559,300 Residential mortgage-related securities FNMA / FHLMC 63,142 3,147 — 66,289 GNMA 159,455 5,217 — 164,672 Commercial mortgage-related securities FNMA/FHLMC 11,220 — — 11,220 GNMA 311,798 10,142 — 321,941 Total investment securities held to maturity $ 1,990,940 $ 133,880 $ (368) $ 2,124,452 The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) $ 529,908 $ 16,269 $ (18) $ 546,160 Residential mortgage-related securities FNMA / FHLMC 131,158 1,562 (59) 132,660 GNMA 982,941 3,887 (1,689) 985,139 Commercial mortgage-related securities FNMA / FHLMC 19,929 1,799 — 21,728 GNMA 1,314,836 7,403 (12,032) 1,310,207 FFELP asset backed securities 270,178 — (6,485) 263,693 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 3,251,950 $ 30,920 $ (20,284) $ 3,262,586 Investment securities held to maturity U. S. Treasury securities $ 999 $ 19 $ — $ 1,018 Obligations of state and political subdivisions (municipal securities) 1,418,569 69,775 (1,118) 1,487,227 Residential mortgage-related securities FNMA / FHLMC 81,676 1,759 (15) 83,420 GNMA 269,523 1,882 (1,108) 270,296 GNMA commercial mortgage-related securities 434,317 6,308 (6,122) 434,503 Total investment securities held to maturity $ 2,205,083 $ 79,744 $ (8,363) $ 2,276,465 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 available for sale and held to maturity at September 30, 2020 are shown below: Available for Sale Held to Maturity ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 8,343 $ 8,350 $ 28,957 $ 29,140 Due after one year through five years 82,198 82,964 63,630 65,751 Due after five years through ten years 344,172 362,247 161,769 170,223 Due after ten years 69,987 75,815 1,190,968 1,295,217 Total debt securities 504,699 529,375 1,445,325 1,560,331 Residential mortgage-related securities FNMA / FHLMC 1,267,003 1,276,463 63,142 66,289 GNMA 399,490 407,313 159,455 164,672 Commercial mortgage-related securities FNMA / FHLMC 19,724 21,877 11,220 11,220 GNMA 670,573 688,378 311,798 321,941 Asset backed securities FFELP 332,398 325,843 — — SBA 9,159 9,111 — — Total investment securities $ 3,203,046 $ 3,258,360 $ 1,990,940 $ 2,124,452 Ratio of fair value to amortized cost 101.7 % 106.7 % On a quarterly basis, the Corporation refreshes the credit quality of each held to maturity security. The following table summarizes the credit quality indicators of held to maturity securities at amortized cost at September 30, 2020: ($ in Thousands) AAA AA A Total U. S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,468 860,465 16,393 1,444,325 Residential mortgage-related securities FNMA/FHLMC 63,142 — — 63,142 GNMA 159,455 — — 159,455 Commercial mortgage-related securities FNMA/FHLMC 11,220 — — 11,220 GNMA 311,798 — — 311,798 Total held to maturity securities $ 1,114,082 $ 860,465 $ 16,393 $ 1,990,940 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, 2020 and 2019 are shown below: Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Gross gains on available for sale securities $ 7 $ 4,013 $ 9,312 $ 6,347 Gross gains on held to maturity securities — — — — Total gains 7 4,013 9,312 6,347 Gross (losses) on available for sale securities — (225) (90) (13,861) Gross (losses) on held to maturity securities — — — — Total (losses) — (225) (90) (13,861) Write-up of equity securities without readily determinable fair values — — — 13,444 Investment securities gains (losses), net $ 7 $ 3,788 $ 9,222 $ 5,931 Proceeds from sales of investment securities $ 8 $ 433,222 $ 626,283 $ 1,367,450 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. During the first nine months of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from held to maturity to available for sale, as permitted by the adoption of ASU 2019-04. The Corporation sold $1.2 billion of taxable floating rate ABS and shorter duration MBS, and CMO Agency securities, with the proceeds utilized to pay down borrowings and to reinvest into higher yielding Agency related mortgage securities with slightly longer durations, repositioning the portfolio for a stable to declining rate environment. The Corporation also donated 42,039 shares of Visa Class B restricted shares to the Corporation's Charitable Remainder Trust during the second quarter of 2019, and the subsequent sale of those shares by the Trust resulted in an observable market price. As a result, the Corporation wrote up its remaining 77,000 Visa Class B restricted shares to fair value. Based on the existing transfer restriction and the uncertainty of covered litigation, the shares were previously carried at a zero cost basis. Investment securities with a carrying value of approximately $1.8 billion and $2.6 billion at September 30, 2020 and December 31, 2019, respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law. Accrued interest receivable on held to maturity securities totaled $13 million and $16 million at September 30, 2020 and December 31, 2019, respectively. Accrued interest receivable on available for sale securities totaled $9 million and $10 million at September 30, 2020 and December 31, 2019, respectively. Accrued interest receivable on both held to maturity and available for sale securities is included in interest receivable on the consolidated balance sheets. There was no interest income reversed for investments going into nonaccrual at September 30, 2020 or December 31, 2019. A security is considered past due once it is 30 days past due under the terms of the agreement. At September 30, 2020, the Corporation had no past due held to maturity securities. The allowance for credit losses on held to maturity securities was approximately $70,000 at September 30, 2020, attributable entirely to the Corporation's municipal securities, included in investment securities held to maturity, net, at amortized cost on the consolidated balance sheets . The Corporation also holds U.S. Treasury and residential mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and, as a result, no allowance for credit losses has been recorded related to these securities. The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC 5 $ (94) $ 77,157 — $ — $ — $ (94) $ 77,157 GNMA 1 — 424 — — — — 424 Asset backed securities FFELP 5 (837) 93,134 20 (5,719) 232,709 (6,556) 325,843 SBA 15 (48) 8,953 — — — (48) 8,953 Other debt securities 3 (3) 2,997 — — — (3) 2,997 Total 29 $ (982) $ 182,665 20 $ (5,719) $ 232,709 $ (6,701) $ 415,374 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 10 $ (368) $ 25,895 — $ — $ — $ (368) $ 25,895 Total 10 $ (368) $ 25,895 — $ — $ — $ (368) $ 25,895 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities available for sale Obligations of state and political subdivisions (municipal securities) 4 $ (18) $ 1,225 — $ — $ — $ (18) $ 1,225 Residential mortgage-related securities FNMA / FHLMC — — — 4 (59) 34,807 (59) 34,807 GNMA 18 (924) 322,394 3 (766) 79,461 (1,689) 401,856 GNMA commercial mortgage-related securities 22 (810) 258,218 42 (11,222) 621,307 (12,032) 879,524 FFELP asset backed securities 19 (6,092) 250,780 2 (393) 12,913 (6,485) 263,693 Other debt securities 2 — 2,000 — — — — 2,000 Total 65 $ (7,843) $ 834,616 51 $ (12,440) $ 748,487 $ (20,284) $ 1,583,104 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 52 $ (1,105) $ 77,562 6 $ (13) $ 2,378 $ (1,118) $ 79,940 Residential mortgage-related securities FNMA / FHLMC 1 (6) 1,242 1 (9) 833 (15) 2,075 GNMA 12 (1,059) 187,261 8 (49) 6,587 (1,108) 193,849 GNMA commercial mortgage-related securities 2 (29) 26,202 21 (6,093) 357,733 (6,122) 383,935 Total 67 $ (2,199) $ 292,267 36 $ (6,164) $ 367,532 $ (8,363) $ 659,799 The Corporation reviews the available for sale 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 the 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 available for sale securities in an unrealized loss position at September 30, 2020 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. The fair value of municipal securities, which pertains to various state and local political subdivisions and school districts, has increased due to the decrease in overall interest rates, resulting in lower unrealized losses at September 30, 2020. The U.S. Treasury 3 year and 5 year rates decreased by 146 bp and 141 bp, respectively, from December 31, 2019. 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. At September 30, 2020 and December 31, 2019, the Corporation had FHLB stock of $82 million and $149 million, respectively. The Corporation had Federal Reserve Bank stock of $87 million and $78 million at September 30, 2020 and December 31, 2019, respectively. Accrued interest receivable on FHLB stock totaled $1 million and $2 million at September 30, 2020 and December 31, 2019. There was approximately $149,000 of accrued interest receivable on Federal Reserve Bank stock at September 30, 2020 and none at December 31, 2019. 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. At both September 30, 2020 and December 31, 2019, the Corporation had equity securities with readily determinable fair values of $2 million.

Loans

Loans	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loans	Loans The period end loan composition was as follows: ($ in Thousands) September 30, 2020 December 31, 2019 PPP $ 1,022,217 $ — Commercial and industrial 7,933,404 7,354,594 Commercial real estate — owner occupied 904,997 911,265 Commercial and business lending 9,860,618 8,265,858 Commercial real estate — investor 4,320,926 3,794,517 Real estate construction 1,859,609 1,420,900 Commercial real estate lending 6,180,536 5,215,417 Total commercial 16,041,154 13,481,275 Residential mortgage 7,885,523 8,136,980 Home equity 761,593 852,025 Other consumer 315,483 351,159 Total consumer 8,962,599 9,340,164 Total loans $ 25,003,753 $ 22,821,440 Accrued interest receivable on loans totaled $67 million at September 30, 2020, and $63 million at December 31, 2019 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 $1 million and $2 million for the three and nine months ended September 30, 2020, respectively. The following table presents commercial and consumer loans by credit quality indicator by vintage year at September 30, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 995,646 $ — $ — $ — $ — $ — $ 995,646 Special Mention — — 7,409 — — — — — 7,409 Potential Problem — — 19,161 — — — — — 19,161 PPP $ — $ — $ 1,022,217 $ — $ — $ — $ — $ — $ 1,022,217 Commercial and industrial: Risk rating: Pass $ 4,904 $ 2,031,744 $ 1,102,032 $ 1,581,019 $ 1,430,036 $ 545,931 $ 326,862 $ 518,950 $ 7,536,572 Special Mention — 9,424 13,594 61,594 48,357 22 13,783 — 146,774 Potential Problem (c) 3,089 10,580 21,483 18,101 81,580 2,369 8,031 2,015 144,159 Nonaccrual (d) 568 200 1,571 6,761 15,728 44,933 29,193 7,513 105,899 Commercial and industrial $ 8,562 $ 2,051,948 $ 1,138,680 $ 1,667,475 $ 1,575,701 $ 593,255 $ 377,868 $ 528,478 $ 7,933,404 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,912 $ 120,161 $ 236,928 $ 137,669 $ 106,305 $ 155,023 $ 90,750 $ 865,748 Special Mention — — 2,420 2,410 1,106 556 2,671 5,236 14,398 Potential Problem — 2,593 678 7,804 1,354 1,135 5,127 4,117 22,808 Nonaccrual — — 168 — 371 326 — 1,177 2,043 Commercial real estate - owner occupied $ 1,150 $ 21,505 $ 123,426 $ 247,142 $ 140,499 $ 108,323 $ 162,821 $ 101,280 $ 904,997 Commercial and business lending: Risk rating: Pass $ 6,054 $ 2,050,656 $ 2,217,839 $ 1,817,947 $ 1,567,704 $ 652,236 $ 481,885 $ 609,700 $ 9,397,966 Special Mention — 9,424 23,423 64,004 49,462 578 16,454 5,236 168,582 Potential Problem (c) 3,089 13,173 41,323 25,905 82,934 3,504 13,158 6,132 186,129 Nonaccrual (d) 568 200 1,739 6,761 16,099 45,259 29,193 8,690 107,941 Commercial and business lending $ 9,712 $ 2,073,453 $ 2,284,323 $ 1,914,617 $ 1,716,200 $ 701,578 $ 540,690 $ 629,759 $ 9,860,618 Commercial real estate - investor: Risk rating: Pass $ 84 $ 189,623 $ 1,082,792 $ 1,030,772 $ 781,592 $ 321,341 $ 350,582 $ 245,290 $ 4,001,992 Special Mention — — 57,701 53,145 12,408 13,439 29,818 1,506 168,018 Potential Problem — 854 16,032 18,026 11,424 14,733 265 39,124 100,459 Nonaccrual 19,964 — 1,018 48,691 446 — — 304 50,458 Commercial real estate - investor $ 20,049 $ 190,477 $ 1,157,543 $ 1,150,634 $ 805,870 $ 349,513 $ 380,665 $ 286,224 $ 4,320,926 Real estate construction: Risk rating: Pass $ 1,151 $ 45,347 $ 545,859 $ 772,861 $ 376,567 $ 69,025 $ 2,588 $ 19,928 $ 1,832,176 Special Mention — — 411 — 24,437 — — 16 24,863 Potential Problem — — 127 — 355 1,557 95 45 2,178 Nonaccrual — — 12 — — — — 380 392 Real estate construction $ 1,151 $ 45,347 $ 546,409 $ 772,861 $ 401,358 $ 70,582 $ 2,683 $ 20,369 $ 1,859,609 Commercial real estate lending: Risk rating: Pass $ 1,236 $ 234,970 $ 1,628,651 $ 1,803,633 $ 1,158,158 $ 390,366 $ 353,170 $ 265,219 $ 5,834,167 Special Mention — — 58,112 53,145 36,845 13,439 29,818 1,522 192,881 Potential Problem — 854 16,159 18,026 11,779 16,289 360 39,169 102,637 Nonaccrual 19,964 — 1,030 48,691 446 — — 684 50,850 Commercial real estate lending $ 21,200 $ 235,823 $ 1,703,952 $ 1,923,495 $ 1,207,229 $ 420,095 $ 383,348 $ 306,593 $ 6,180,536 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 7,290 $ 2,285,626 $ 3,846,490 $ 3,621,580 $ 2,725,863 $ 1,042,603 $ 835,055 $ 874,918 $ 15,232,134 Special Mention — 9,424 81,534 117,150 86,307 14,017 46,272 6,758 361,463 Potential Problem 3,089 14,027 57,482 43,931 94,713 19,793 13,518 45,301 288,766 Nonaccrual 20,533 200 2,769 55,451 16,546 45,259 29,193 9,374 158,792 Total commercial $ 30,912 $ 2,309,277 $ 3,988,275 $ 3,838,112 $ 2,923,428 $ 1,121,672 $ 924,038 $ 936,352 $ 16,041,154 Residential mortgage: Risk rating: Pass $ — $ — $ 1,585,703 $ 1,608,973 $ 685,384 $ 1,119,248 $ 1,025,378 $ 1,794,997 $ 7,819,683 Special Mention — — 684 — 37 — — 392 1,113 Potential Problem — — 695 663 137 — 206 694 2,396 Nonaccrual — — 2,292 3,282 5,624 8,243 10,334 32,557 62,331 Residential mortgage $ — $ — $ 1,589,374 $ 1,612,918 $ 691,182 $ 1,127,490 $ 1,035,918 $ 1,828,640 $ 7,885,523 Home equity: Risk rating: Pass $ 10,470 $ 610,660 $ 2,041 $ 14,679 $ 18,022 $ 13,415 $ 6,700 $ 83,761 $ 749,277 Special Mention 107 39 — — — — — 369 408 Potential Problem — 1,632 — — — — — — 1,632 Nonaccrual 972 606 421 361 523 353 230 7,782 10,277 Home equity $ 11,549 $ 612,936 $ 2,462 $ 15,040 $ 18,545 $ 13,768 $ 6,930 $ 91,912 $ 761,593 Other consumer: Risk rating: Pass $ 27 $ 164,453 $ 7,298 $ 11,505 $ 4,438 $ 2,259 $ 1,475 $ 123,487 $ 314,916 Special Mention 5 369 — — — — 3 5 377 Nonaccrual 2 23 1 63 5 6 74 19 190 Other consumer $ 34 $ 164,845 $ 7,298 $ 11,568 $ 4,443 $ 2,265 $ 1,551 $ 123,511 $ 315,483 Total consumer: Risk rating: Pass $ 10,497 $ 775,112 $ 1,595,042 $ 1,635,157 $ 707,843 $ 1,134,922 $ 1,033,553 $ 2,002,246 $ 8,883,875 Special Mention 112 408 684 — 37 — 3 766 1,898 Potential Problem — 1,632 695 663 137 — 206 694 4,028 Nonaccrual 974 629 2,713 3,706 6,153 8,602 10,638 40,357 72,798 Total consumer $ 11,583 $ 777,781 $ 1,599,134 $ 1,639,527 $ 714,171 $ 1,143,524 $ 1,044,399 $ 2,044,063 $ 8,962,599 Total loans: Risk rating: Pass $ 17,787 $ 3,060,738 $ 5,441,532 $ 5,256,737 $ 3,433,706 $ 2,177,524 $ 1,868,608 $ 2,877,164 $ 24,116,009 Special Mention 112 9,832 82,219 117,150 86,344 14,017 46,275 7,524 363,361 Potential Problem 3,089 15,659 58,177 44,595 94,850 19,793 13,724 45,996 292,794 Nonaccrual 21,507 829 5,482 59,157 22,698 53,861 39,830 49,731 231,590 Total loans $ 42,495 $ 3,087,058 $ 5,587,409 $ 5,477,639 $ 3,637,599 $ 2,265,196 $ 1,968,437 $ 2,980,415 $ 25,003,753 (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) Includes $60 million of oil and gas related loans (d) Includes $8 million of oil and gas related loans The following table presents commercial and consumer loans by credit quality indicator at December 31, 2019 : ($ in Thousands) Pass Special Mention Potential Problem Nonaccrual Total Commercial and industrial $ 7,118,448 $ 79,525 $ 110,308 $ 46,312 $ 7,354,594 Commercial real estate - owner occupied 866,193 25,115 19,889 67 911,265 Commercial and business lending 7,984,641 104,641 130,197 46,380 8,265,858 Commercial real estate - investor 3,620,785 139,873 29,449 4,409 3,794,517 Real estate construction 1,420,374 33 — 493 1,420,900 Commercial real estate lending 5,041,159 139,906 29,449 4,902 5,215,417 Total commercial 13,025,800 244,547 159,646 51,282 13,481,275 Residential mortgage 8,077,122 563 1,451 57,844 8,136,980 Home equity 841,757 1,164 — 9,104 852,025 Other consumer 350,260 748 — 152 351,159 Total consumer 9,269,139 2,475 1,451 67,099 9,340,164 Total loans $ 22,294,939 $ 247,022 $ 161,097 $ 118,380 $ 22,821,440 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 allowance for loan losses, allowance for unfunded commitments, nonaccrual, and charge off policies. 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 deserve management’s attention. 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 and 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, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90 Days or Nonaccrual (b)(c) Total PPP $ 1,022,217 $ — $ — $ — $ — $ 1,022,217 Commercial and industrial 7,826,445 115 183 763 105,899 7,933,404 Commercial real estate - owner occupied 902,085 870 — — 2,043 904,997 Commercial and business lending 9,750,747 984 183 763 107,941 9,860,618 Commercial real estate - investor 4,270,059 409 — — 50,458 4,320,926 Real estate construction 1,859,106 95 16 — 392 1,859,609 Commercial real estate lending 6,129,165 504 16 — 50,850 6,180,536 Total commercial 15,879,912 1,488 199 763 158,792 16,041,154 Residential mortgage 7,816,986 5,793 392 22 62,331 7,885,523 Home equity 745,563 5,201 408 145 10,277 761,593 Other consumer 313,017 949 402 925 190 315,483 Total consumer 8,875,566 11,943 1,201 1,091 72,798 8,962,599 Total loans $ 24,755,478 $ 13,431 $ 1,400 $ 1,854 $ 231,590 $ 25,003,753 (a) Any deferred loans related to COVID-19 are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $186 million, or 80%, were current with respect to payment at September 30, 2020. (c) No interest income was recognized on nonaccrual loans for both the three and nine months ended September 30, 2020. In addition, there were $40 million of nonaccrual loans for which there was no related ACLL at September 30, 2020. The following table presents loans by past due status at December 31, 2019: Accruing ($ in Thousands) Current 30-59 Days 60-89 Days 90 Days or Nonaccrual (a) Total Commercial and industrial $ 7,307,118 $ 576 $ 245 $ 342 $ 46,312 $ 7,354,594 Commercial real estate - owner occupied 909,828 1,369 — — 67 911,265 Commercial and business lending 8,216,947 1,945 245 342 46,380 8,265,858 Commercial real estate - investor 3,788,296 1,812 — — 4,409 3,794,517 Real estate construction 1,420,310 64 33 — 493 1,420,900 Commercial real estate lending 5,208,606 1,876 33 — 4,902 5,215,417 Total commercial 13,425,552 3,821 278 342 51,282 13,481,275 Residential mortgage 8,069,863 8,749 525 — 57,844 8,136,980 Home equity 837,274 4,483 1,164 — 9,104 852,025 Other consumer 347,007 1,135 949 1,917 152 351,159 Total consumer 9,254,144 14,366 2,638 1,917 67,099 9,340,164 Total loans $ 22,679,696 $ 18,188 $ 2,916 $ 2,259 $ 118,380 $ 22,821,440 (a) Of the total nonaccrual loans, $48 million, or 41%, were current with respect to payment at December 31, 2019. The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $2 million of purchased credit-impaired loans, at December 31, 2019 : ($ in Thousands) Recorded Unpaid Related Average Interest Loans with a related allowance Commercial and industrial $ 47,249 $ 63,346 $ 12,010 $ 45,290 $ 1,832 Commercial real estate — owner occupied 1,676 1,682 19 1,774 88 Commercial and business lending 48,924 65,028 12,029 47,064 1,919 Commercial real estate — investor 928 2,104 15 950 15 Real estate construction 477 559 67 494 30 Commercial real estate lending 1,405 2,663 82 1,445 45 Total commercial 50,329 67,691 12,111 48,509 1,965 Residential mortgage 21,450 22,625 2,740 23,721 856 Home equity 3,076 3,468 1,190 3,756 191 Other consumer 1,247 1,249 125 1,250 1 Total consumer 25,773 27,342 4,055 28,726 1,047 Total loans with a related allowance $ 76,102 $ 95,033 $ 16,165 $ 77,235 $ 3,012 Loans with no related allowance Commercial and industrial $ 14,787 $ 33,438 $ — $ 20,502 $ 63 Commercial real estate — owner occupied — — — — — Commercial and business lending 14,787 33,438 — 20,502 63 Commercial real estate — investor 3,705 3,705 — 3,980 159 Real estate construction — — — — — Commercial real estate lending 3,705 3,705 — 3,980 159 Total commercial 18,491 37,142 — 24,482 222 Residential mortgage 14,104 14,461 — 10,962 373 Home equity 1,346 1,383 — 1,017 21 Other consumer — — — — — Total consumer 15,450 15,845 — 11,979 394 Total loans with no related allowance $ 33,941 $ 52,987 $ — $ 36,462 $ 616 Total Commercial and industrial $ 62,035 $ 96,784 $ 12,010 $ 65,792 $ 1,895 Commercial real estate — owner occupied 1,676 1,682 19 1,774 88 Commercial and business lending 63,711 98,466 12,029 67,566 1,982 Commercial real estate — investor 4,633 5,808 15 4,931 174 Real estate construction 477 559 67 494 30 Commercial real estate lending 5,110 6,367 82 5,425 204 Total commercial 68,820 104,833 12,111 72,991 2,186 Residential mortgage 35,554 37,087 2,740 34,683 1,229 Home equity 4,422 4,851 1,190 4,773 211 Other consumer 1,247 1,249 125 1,250 1 Total consumer 41,223 43,187 4,055 40,706 1,441 Total loans (a) $ 110,043 $ 148,020 $ 16,165 $ 113,697 $ 3,628 (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 63% of the unpaid principal balance at December 31, 2019. 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: September 30, 2020 December 31, 2019 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 16,002 $ 7,827 $ 16,678 $ 7,376 Commercial real estate — owner occupied 1,389 168 1,676 — Commercial real estate — investor 635 — 293 — Real estate construction 382 98 298 179 Residential mortgage 5,378 14,535 3,955 13,035 Home equity 1,889 1,216 1,896 1,904 Other consumer 1,218 — 1,246 1 Total restructured loans (b) $ 26,891 $ 23,844 $ 26,041 $ 22,494 (a) Nonaccrual restructured loans have been included within nonaccrual loans. (b) Does not include any restructured loans related to COVID-19 in accordance with Section 4013 of the CARES Act. The Corporation had a recorded investment of $9 million in loans modified in a TDR during the nine months ended September 30, 2020, of which $3 million were in accrual status and $6 million were in nonaccrual pending a sustained period of repayment. Short-term loan modifications made in good faith to help ease the adverse effects of COVID-19 are not categorized as TDRs in accordance with regulatory guidance. The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance for the nine months ended September 30, 2020 and 2019: Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 3 $ 1,250 $ 1,324 1 $ 185 $ 185 Commercial real estate — owner occupied 2 453 751 — — — Commercial real estate — investor 1 530 530 — — — Real estate construction 1 102 102 — — — Residential mortgage 32 5,789 5,870 47 6,785 6,863 Home equity 18 676 702 18 520 520 Other consumer — — — 1 9 9 Total loans modified 57 $ 8,800 $ 9,280 67 $ 7,500 $ 7,577 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-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, 2020, 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, 2020. 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, 2020 and 2019 and the recorded investment in these restructured loans as of September 30, 2020 and 2019: Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 ($ in Thousands) Number of Recorded Number of Recorded Commercial real estate — investor — $ — 1 $ 461 Residential mortgage 5 1,036 27 4,528 Home equity 4 208 19 538 Total loans modified 9 $ 1,244 47 $ 5,526 All loans modified in a TDR are 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 adoption of ASU 2016-13 on January 1, 2020, the Corporation had $114 million in loans meeting this classification compared to $73 million at September 30, 2020. Of the loans classified as probable TDRs at September 30, 2020, all of them are within the oil and gas portfolio. Allowance for Credit Losses on Loans The ACLL is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the ACLL represents management’s estimate of an amount appropriate to provide for expected lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimates of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. A main factor in the determination of the ACLL is the economic forecast. The Corporation utilized the Moody's baseline forecast, updated during September 2020, in the allowance model. The forecast is applied over a 1 year reasonable and supportable period with immediate reversion to historical losses. The Corporation changed the reversion assumptions during the first quarter of 2020 from straight-line over 1 year to immediate reversion due to the uncertainty within the economic forecasts due to COVID-19. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). See Note 12 for additional information on the change in the allowance for unfunded commitments. The following table presents a summary of the changes in the ACLL by portfolio segment for the nine months ended September 30, 2020: ($ 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 loan losses Sept. 30, 2020 ACLL / Loans Allowance for loan losses PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 968 $ 968 Commercial and industrial 91,133 52,919 144,052 (70,011) 5,210 (64,802) 293 408 87,840 167,793 Commercial real estate — owner occupied 10,284 (1,851) 8,433 (419) 4 (415) 890 255 2,027 11,190 Commercial and business lending 101,417 51,068 152,485 (70,430) 5,213 (65,216) 1,183 663 90,836 179,951 Commercial real estate — investor 40,514 2,041 42,555 (4,224) 643 (3,581) 753 472 50,004 90,201 Real estate construction 24,915 7,467 32,382 (42) 30 (12) 435 492 3,823 37,119 Commercial real estate lending 65,429 9,508 74,937 (4,266) 673 (3,593) 1,188 964 53,827 127,321 Total commercial 166,846 60,576 227,422 (74,696) 5,887 (68,810) 2,371 1,627 144,662 307,272 Residential mortgage 16,960 33,215 50,175 (1,615) 409 (1,206) 651 403 (6,382) 43,640 Home equity 10,926 11,649 22,575 (1,551) 1,476 (76) 422 374 (3,935) 19,361 Other consumer 6,639 7,016 13,655 (3,875) 845 (3,030) 61 140 3,612 14,438 Total consumer 34,525 51,880 86,405 (7,042) 2,730 (4,311) 1,134 917 (6,705) 77,440 Total loans $ 201,371 $ 112,457 $ 313,828 $ (81,738) $ 8,617 $ (73,121) $ 3,504 $ 2,543 $ 137,957 $ 384,711 Allowance for unfunded commitments Commercial and industrial 12,276 (3,998) 8,278 — — — — 61 12,851 21,190 Commercial real estate — owner occupied 127 — 127 — — — — 4 434 564 Commercial and business lending 12,403 (3,998) 8,405 — — — — 65 13,285 21,754 Commercial real estate — investor 530 246 776 — — — — 2 (58) 719 Real estate construction 7,532 18,347 25,879 — — — 45 2,703 28,626 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 2,644 29,345 Total commercial 20,465 14,595 35,060 — — — — 112 15,929 51,100 Home equity 1,038 2,591 3,629 — — — — 66 (106) 3,588 Other consumer 405 1,504 1,909 — — — — — 676 2,585 Total consumer 1,443 4,095 5,538 — — — — 66 571 6,176 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 16,500 $ 57,276 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 968 $ 968 0.09 % Commercial and industrial 103,409 48,921 152,330 (70,011) 5,210 (64,802) 293 469 100,691 188,983 2.38 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 4 (415) 890 259 2,461 11,755 1.30 % Commercial and business lending 113,820 47,070 160,890 (70,430) 5,213 (65,216) 1,183 728 104,120 201,706 2.05 % Commercial real estate — investor 41,044 2,287 43,331 (4,224) 643 (3,581) 753 474 49,945 90,921 2.10 % Real estate construction 32,447 25,814 58,261 (42) 30 (12) 435 537 6,525 65,745 3.54 % Commercial real estate lending 73,490 28,101 101,591 (4,266) 673 (3,593) 1,188 1,011 56,471 156,667 2.53 % Total commercial 187,311 75,171 262,482 (74,696) 5,887 (68,810) 2,371 1,739 160,591 358,372 2.23 % Residential mortgage 16,960 33,215 50,175 (1,615) 409 (1,206) 651 403 (6,380) 43,643 0.55 % Home equity 11,964 14,240 26,204 (1,551) 1,476 (76) 422 440 (4,041) 22,949 3.01 % Other consumer 7,044 8,520 15,564 (3,875) 845 (3,030) 61 140 4,287 17,023 5.40 % Total consumer 35,968 55,975 91,943 (7,042) 2,730 (4,311) 1,134 983 (6,134) 83,616 0.93 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (81,738) $ 8,617 $ (73,121) $ 3,504 $ 2,722 $ 154,457 $ 441,988 1.77 % The following table presents details of the allowance for loan losses segregated by loan portfolio segment as of December 31, 2019, calculated in accordance with prior incurred loss methodology applicable under ASC Topic 310: ($ in Thousands) December 31, 2018 Charge offs Recoveries Net Charge offs Provision for loan losses December 31, 2019 Allowance for loan losses Commercial and industrial $ 108,835 $ (63,315) $ 11,875 $ (51,441) $ 33,738 $ 91,133 Commercial real estate — owner occupied 9,255 (222) 2,795 2,573 (1,543) 10,284 Commercial and business lending 118,090 (63,537) 14,670 (48,868) 32,195 101,417 Commercial real estate — investor 40,844 — 31 31 (361) 40,514 Real estate construction 28,240 (60) 302 243 (3,568) 24,915 Commercial real estate lending 69,084 (60) 333 274 (3,929) 65,429 Total commercial 187,174 (63,597) 15,003 (48,594) 28,266 166,846 Residential mortgage 25,595 (3,322) 692 (2,630) (6,005) 16,960 Home equity 19,266 (1,846) 2,599 753 (9,093) 10,926 Other consumer 5,988 (5,548) 868 (4,681) 5,332 6,639 Total consumer 50,849 (10,716) 4,159 (6,558) (9,766) 34,525 Total loans $ 238,023 $ (74,313) $ 19,161 $ (55,152) $ 18,500 $ 201,371 A summary of the individually and collectively evaluated loans by portfolio segment at December 31, 2019, was as follows: Allowance for loan losses Loans ($ in Thousands) Individually evaluated for impairment Collectively evaluated for impairment Total allowance for loan losses Individually evaluated for impairment Collectively evaluated for impairment Acquired and accounted for under ASC 310-30 (a) Total loans Commercial and industrial $ 12,010 $ 79,123 $ 91,133 $ 62,035 $ 7,292,217 $ 342 $ 7,354,594 Commercial real estate — owner occupied 19 10,265 10,284 1,676 909,010 579 911,265 Commercial and business lending 12,029 89,388 101,417 63,711 8,201,227 921 8,265,858 Commercial real estate — investor 15 40,498 40,514 4,633 3,789,755 129 3,794,517 Real estate construction 67 24,848 24,915 477 1,420,416 7 1,420,900 Commercial real estate lending 82 65,346 65,429 5,110 5,210,171 136 5,215,417 Total commercial 12,111 154,734 166,846 68,821 13,411,398 1,057 13,481,275 Residential mortgage 2,740 14,220 16,960 35,554 8,100,958 469 8,136,980 Home equity 1,190 9,737 10,926 4,422 847,577 26 852,025 Other consumer 125 6,514 6,639 1,247 349,912 — 351,159 Total consumer 4,055 30,471 34,525 41,223 9,298,447 495 9,340,164 Total loans $ 16,165 $ 185,205 $ 201,371 $ 110,043 $ 22,709,845 $ 1,552 $ 22,821,440 (a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality." 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 Acquisitions and Dispositions for more information on loans acquired in a business combination. After January 1, 2020, acquired loans were segregated into two types: • PCD loans are loans demonstrating more than insignificant credit deterioration since origination and are accounted for with ASC 326-30. Under this guidance, the credit mark on acquired assets grosses up the allowance for loan losses and the amortized cost of the loan. • 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. Loans acquired in a business combination prior to January 1, 2020 were recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan losses. Prior to January 1, 2020, acquired loans were segregated into two types: • Performing loans were accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination. • Nonperforming loans were accounted for in accordance with ASC Topic 310-30 as they displayed significant credit deterioration since origination.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2020
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 2020, utilizing a quantitative assessment of goodwill impairment which included determining the estimated fair value of each reporting unit, utilizing an equally weighted combination of discounted cash flow and market-based approaches, and comparing that fair value to each reporting unit’s carrying amount (including goodwill). An impairment loss is recognized if the carrying amount of a reporting unit exceeds its fair value. Based on the quantitative assessment, management concluded that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, based on the step one quantitative analysis, no impairment was required. There have been no events since the May 2020 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2019 or the first nine months of 2020. Each of the valuation techniques employed by the Company requires significant assumptions. Depending upon the specific approach, assumptions are made regarding the economic environment, expected net interest margins, growth rates, discount rates for cash flows, asset quality metrics, control premiums, and price-to-forward earnings multiples. Changes to any one of these assumptions could result in significantly different results. A sustained decline in the Company’s expected future cash flows or estimated growth rates, or a prolonged decline in the price of the Company’s common stock due to further deterioration in the economic environment, may necessitate additional interim testing, which could result in an impairment charge to goodwill in future reporting periods. At September 30, 2020 and December 31, 2019, the Corporation had goodwill of $1.1 billion and $1.2 billion, respectively. There was an increase of $13 million relating to the First Staunton acquisition, and an $82 million reduction related to the disposition of ABRC. Other Intangible Assets The Corporation has other intangible assets that are amortized, consisting of CDIs, other intangibles, and MSRs. Other intangibles decreased $19 million from December 31, 2019, primarily driven by a $17 million decrease due to the disposition of ABRC. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) Nine Months Ended September 30, 2020 Year Ended December 31, 2019 Core deposit intangibles Gross carrying amount at the beginning of the year $ 80,730 $ 58,100 Additions during the period 7,379 22,630 Accumulated amortization (19,003) (12,456) Net book value $ 69,107 $ 68,274 Amortization during the year $ 6,547 $ 7,130 Other intangibles Gross carrying amount at the beginning of the year $ 38,970 $ 44,887 Additions during the period 200 — Reductions due to sale (17,435) (217) Accumulated amortization (20,335) (24,643) Net book value $ 1,400 $ 20,027 Amortization during the year $ 1,393 $ 2,818 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. During the first nine months of 2020, the Corporation recognized temporary impairment of $18 million driven by decreasing interest rates. If it is later determined that all or a portion of the temporary impairment no longer exists for a stratification, the valuation is reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the MSRs asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the MSRs asset and valuation allowance, precluding subsequent recoveries. See Note 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 which further discusses fair value measurement relative to the MSRs asset. A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows: ($ in Thousands) Nine Months Ended September 30, 2020 Year Ended December 31, 2019 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 67,607 $ 68,433 Additions from acquisition 1,357 — Additions 11,495 11,606 Amortization (16,416) (12,432) Mortgage servicing rights at end of period $ 64,043 $ 67,607 Valuation allowance at beginning of period $ (302) $ (239) (Additions) recoveries, net (18,481) (63) Valuation allowance at end of period $ (18,782) $ (302) Mortgage servicing rights, net $ 45,261 $ 67,306 Fair value of mortgage servicing rights $ 45,303 $ 72,532 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 8,218,839 $ 8,488,969 Mortgage servicing rights, net to servicing portfolio 0.55 % 0.79 % Mortgage servicing rights expense (a) $ 34,897 $ 12,494 (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, 2020. 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 Other Intangibles Mortgage Servicing Rights Three Months Ending December 31, 2020 $ 2,203 $ 50 $ 4,245 2021 8,811 200 15,333 2022 8,811 200 10,935 2023 8,811 200 8,030 2024 8,811 200 6,095 2025 8,811 200 4,764 Beyond 2025 22,849 350 14,640 Total Estimated Amortization Expense $ 69,107 $ 1,400 $ 64,043

Short and Long-Term Funding

Short and Long-Term Funding	9 Months Ended
	Sep. 30, 2020
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), long-term funding (funding with original contractual maturities greater than one year), and FHLB advances (funding based on original contractual maturities): ($ in Thousands) September 30, 2020 December 31, 2019 Short-Term Funding Federal funds purchased $ 7,575 $ 362,000 Securities sold under agreements to repurchase 147,754 71,097 Federal funds purchased and securities sold under agreements to repurchase 155,329 433,097 Commercial paper 50,987 32,016 Total short-term funding $ 206,316 $ 465,113 Long-Term Funding Bank senior notes, at par, due 2021 $ 300,000 $ 300,000 Corporation subordinated notes, at par, due 2025 250,000 250,000 PPPLF 1,022,217 — Finance leases 1,165 2,209 Capitalized costs (1,964) (2,866) Total long-term funding 1,571,418 549,343 Total short and long-term funding, excluding FHLB advances $ 1,777,735 $ 1,014,456 FHLB Advances Short-term FHLB advances $ — $ 520,000 Long-term FHLB advances 1,706,763 2,660,967 Total FHLB advances $ 1,706,763 $ 3,180,967 Total short and long-term funding $ 3,484,498 $ 4,195,422 Securities Sold Under Agreements to Repurchase ("Repurchase Agreements") 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). See Note 11 for additional disclosures on balance sheet offsetting. The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of September 30, 2020, the Corporation pledged agency mortgage-related securities with a fair value of $246 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of September 30, 2020 and December 31, 2019 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total September 30, 2020 Repurchase agreements Agency mortgage-related securities $ 147,754 $ — $ — $ — $ 147,754 Total $ 147,754 $ — $ — $ — $ 147,754 December 31, 2019 Repurchase agreements Agency mortgage-related securities $ 71,097 $ — $ — $ — $ 71,097 Total $ 71,097 $ — $ — $ — $ 71,097 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 have a fixed coupon interest rate of 3.50% and were issued at a discount. 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. Paycheck Protection Program Liquidity Facility In connection with the funding of PPP loans, the Corporation has utilized the PPPLF. These borrowings from the Federal Reserve Bank match the term of the underlying loan, which has been pledged to secure the borrowings, with original terms of two five two five Finance Leases In connection with the construction of new branches in Oshkosh and Eau Claire, Wisconsin, the Corporation entered into land leases with options to purchase the underlying land for a fixed price, which the Corporation now expects to exercise. The finance leases have fixed interest rates of approximately 1.00%. See Note 18 for additional disclosure regarding the Corporation’s leases. FHLB Advances At September 30, 2020, the Corporation had $1.7 billion of FHLB advances, down $1.5 billion, or 46%, from December 31, 2019. This is primarily due to the Corporation's prepayment of $950 million in long-term FHLB advances in the third quarter of 2020. As a result, the Corporation incurred a $45 million loss on the prepayment. In addition, short-term FHLB advances decreased $520 million from December 31, 2019.

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Sep. 30, 2020
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 $75 million of investment securities as collateral at September 30, 2020, and pledged $57 million of investment securities as collateral at December 31, 2019. At September 30, 2020, the Corporation posted $30 million of cash collateral compared to $14 million at December 31, 2019. 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. Fair Value Hedges of Interest Rate Risk The Corporation is exposed to changes in the fair value of certain of its pools of prepayable fixed-rate assets due to changes in benchmark interest rates. The Corporation used interest rate swaps to manage its exposure to changes in fair value on these instruments attributable to changes in the designated benchmark interest rate. Interest rate swaps designated as fair value hedges involved the payment of fixed-rate amounts to a counterparty in exchange for the Corporation receiving variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk were recognized in interest income. During the fourth quarter of 2019, the Corporation terminated the outstanding fair value hedges. Derivatives to Accommodate Customer Needs The Corporation also 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. 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, 2020 and December 31, 2019. 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, 2020 and December 31, 2019. 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. September 30, 2020 December 31, 2019 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 $ 3,731,752 $ 225,912 $ 3,731,752 $ 28,960 $ 3,029,877 $ 77,024 $ 3,029,877 $ 13,073 Foreign currency exchange forwards 431,862 4,710 422,645 4,563 272,636 4,226 264,653 4,048 Commodity contracts 132,055 25,935 127,597 24,476 255,089 20,528 255,165 19,624 Mortgage banking (a)(b) 171,871 7,888 264,000 — 255,291 2,527 263,000 710 Gross derivatives before netting $ 264,445 $ 57,999 $ 104,305 $ 37,455 Less: Legally enforceable master netting agreements 2,524 2,524 10,410 10,410 Less: Cash collateral pledged/received 24,837 28,363 1,408 11,365 Total derivative instruments, after netting $ 237,084 $ 27,112 $ 92,487 $ 15,680 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. (b) Includes $108 thousand forward commitment fair value. The Corporation terminated its $500 million fair value hedge during the fourth quarter of 2019. At September 30, 2020, the amortized cost basis of the closed portfolios which had previously been used in the terminated hedging relationship was $674 million and is included in loans and investment securities, available for sale, at fair value on the consolidated balance sheets. This amount includes $4 million of hedging adjustments on the discontinued hedging relationships. The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three and nine months ended September 30, 2020 and 2019: Location and Amount of Gain or (Loss) Recognized in Income on Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 ($ 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 $ (481) $ — $ (59) $ — $ (1,345) $ (262) $ 160 $ — The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (481) — 452 — (1,345) (262) 6,674 — Derivatives designated as hedging instruments (a) — — (511) — — — (6,514) — (a) Includes net settlements on the derivatives. 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, 2020 and 2019: Consolidated Statements of Income Category of Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ 507 $ (619) $ (2,648) $ (2,309) Foreign currency exchange forwards Capital markets, net 49 72 (31) 284 Commodity contracts Capital markets, net (86) 208 555 (2,037) Interest rate lock commitments (mortgage) Mortgage banking, net (4,948) (2,851) 5,361 (191) Forward commitments (mortgage) Mortgage banking, net 1,293 1,313 710 1,482

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
	Sep. 30, 2020
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. Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”) The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The right of set-off for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). In addition, the Corporation does not enter into reverse repurchase agreements; therefore, there is no such offsetting to be done with the repurchase agreements. See Note 9 for additional disclosures on repurchase agreements. 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 Investment Securities Received ($ in Thousands) Derivative Cash Collateral Received Net amount Derivative assets September 30, 2020 $ 27,408 $ (2,524) $ (24,837) $ 47 $ — $ 47 December 31, 2019 11,864 (10,410) (1,408) 45 — 45 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Investment Securities Pledged ($ in Thousands) Derivative Liabilities Offset Cash Collateral Pledged Net amount Derivative liabilities September 30, 2020 $ 31,164 $ (2,524) $ (28,363) $ 277 $ — $ 277 December 31, 2019 22,189 (10,410) (11,365) 413 — 413

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	9 Months Ended
	Sep. 30, 2020
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) September 30, 2020 December 31, 2019 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 9,582,235 $ 9,024,412 Commercial letters of credit (a) 6,977 7,081 Standby letters of credit (c) 252,292 277,969 (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 current fair value, or the fair value is based on fees currently charged to enter into similar agreements and was not material at September 30, 2020 or December 31, 2019. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10. (c) The Corporation has established a liability of $2 million and $3 million for September 30, 2020 and December 31, 2019, respectively, as an estimate of the fair value of these financial instruments. Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Nine Months Ended September 30, 2020 Year Ended December 31, 2019 Allowance for Unfunded Commitments Balance at beginning of period $ 21,907 $ 24,336 Cumulative effect of ASU 2016-13 adoption (CECL) 18,690 N/A Balance at beginning of period, adjusted 40,597 24,336 Provision for unfunded commitments 16,500 (2,500) Amount recorded at acquisition 179 70 Balance at end of period $ 57,276 $ 21,907 The increase is a result of the Day 1 modified retrospective adjustment of $19 million for the adoption of ASU 2016-13. In addition, during the year, there was a $17 million increase to the allowance for unfunded commitments driven by the expected impact of the COVID-19 pandemic within the economic models used in the new expected credit loss methodology. See Note 3 and Note 7 of the notes to consolidated financial statements for additional information on the adoption of ASU 2016-13 and the allowance for unfunded commitments. 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 are recorded 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, 2020 was $285 million, compared to $248 million at December 31, 2019, 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 $18 million and $14 million for the nine months ended September 30, 2020 and 2019, respectively, and $6 million and $4 million for the three months ended September 30, 2020 and 2019, respectively. The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $274 million at September 30, 2020 and $234 million at December 31, 2019. The Corporation’s unfunded equity contributions relating to investments in qualified affordable housing, federal and state historic projects, and new market projects are recorded in accrued expenses and other liabilities on the consolidated balance sheets. The Corporation’s remaining unfunded equity contributions totaled $147 million and $123 million at September 30, 2020 and December 31, 2019, respectively. For the nine months ended September 30, 2020 and the year ended December 31, 2019, 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 investments 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 $28 million and $26 million at September 30, 2020 and December 31, 2019, 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. The Corporation does not believe it is presently subject to any legal proceedings the resolution of which would have a material adverse effect on our business, financial condition, operating results or cash flows. 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. As a result of make whole requests, the Corporation has repurchased loans with principal balances of $7 million and $2 million for the nine months ended September 30, 2020 and the year ended December 31, 2019, respectively. There were no loss reimbursement and settlement claims paid for the nine months ended September 30, 2020 and such claims were negligible for the year ended December 31, 2019. Make whole requests during 2019 and the first nine months of 2020 generally arose from loans sold during the period of January 1, 2012 to December 31, 2019. Since January 1, 2012, loans sold totaled $14.0 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of September 30, 2020, approximately $7.2 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 $2 million as of September 30, 2020 and approximately $795,000 as of December 31, 2019. 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, 2020 and December 31, 2019, there were approximately $47 million and $39 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, 2020 and December 31, 2019, there were $36 million and $45 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, 2020
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 2019 Annual Report on Form 10-K. There has been one significant change to the methodologies for assets and liabilities measured at fair value on a nonrecurring basis: Individually Evaluated Loans: The Corporation individually evaluates loans when a commercial loan relationship is in nonaccrual status or when a commercial and consumer loan relationship has its terms restructured in a TDR or when a loan meets the Corporation's definition of a probable TDR. Prior to January 1, 2020, management considered a loan impaired when it was probable that the Corporation would be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. See Note 7 for additional information regarding the Corporation’s individually evaluated loans. The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy September 30, 2020 December 31, 2019 Assets Investment securities available for sale U.S. Treasury securities Level 1 $ 26,650 $ — Agency securities Level 2 25,033 — Obligations of state and political subdivisions (municipal securities) Level 2 474,695 546,160 Residential mortgage-related securities FNMA / FHLMC Level 2 1,276,463 132,660 GNMA Level 2 407,313 985,139 Commercial mortgage-related securities FNMA / FHLMC Level 2 21,877 21,728 GNMA Level 2 688,378 1,310,207 Asset backed securities FFELP Level 2 325,843 263,693 SBA Level 2 9,111 — Other debt securities Level 2 2,997 3,000 Total investment securities available for sale Level 1 $ 26,650 $ — Total investment securities available for sale Level 2 3,231,711 3,262,586 Equity securities with readily determinable fair values Level 1 1,646 1,646 Residential loans held for sale Level 2 130,139 136,280 Interest rate-related instruments (a) Level 2 225,912 77,024 Foreign currency exchange forwards (a) Level 2 4,710 4,226 Commodity contracts (a) Level 2 25,935 20,528 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 7,888 2,527 Liabilities Interest rate-related instruments (a) Level 2 $ 28,960 $ 13,073 Foreign currency exchange forwards (a) Level 2 4,563 4,048 Commodity contracts (a) Level 2 24,476 19,624 Forward commitments to sell residential mortgage loans Level 3 — 710 (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 same counterparty where there is a legally enforceable master netting agreement in place. The table below presents a rollforward of the consolidated balance sheets amounts for the nine months ended September 30, 2020 and the year ended December 31, 2019, 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, 2018 $ 2,208 $ 2,072 $ 140 New production 24,164 (2,367) 26,531 Closed loans / settlements (29,375) (5,968) (23,407) Other 5,530 6,973 (1,443) Mortgage derivative gain (loss) 319 (1,362) 1,681 Balance December 31, 2019 $ 2,527 $ 710 $ 1,817 New production $ 59,550 $ (1,790) $ 61,340 Closed loans / settlements (60,000) (14,169) (45,831) Other 5,703 15,140 (9,437) Mortgage derivative gain (loss) 5,253 (819) 6,072 Balance September 30, 2020 $ 7,780 $ (108) $ 7,888 The closing ratio on interest rate lock commitments to originate residential mortgage loans held for sale is a Level 3 measurement, and was 88% at September 30, 2020. The following table presents the carrying value of equity securities without readily determinable fair values still held as of September 30, 2020 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, 2020: ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2019 $ 13,444 Carrying value changes — Carrying value as of September 30, 2020 $ 13,444 Cumulative upward carrying value changes between January 1, 2018 and September 30, 2020 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2020 $ — 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 Adjustment Recognized on the Consolidated Statements of Income ($ in Thousands) Fair Value Hierarchy Fair Value September 30, 2020 Assets Individually evaluated loans (a) Level 3 $ 117,451 Provision for credit losses $ (96,856) OREO (b) Level 2 10,953 Other noninterest expense (7,339) Mortgage servicing rights Level 3 45,303 Mortgage banking, net (18,481) December 31, 2019 Assets Impaired loans (c) Level 3 $ 45,792 Provision for credit losses (d) $ (66,172) OREO (b) Level 2 3,565 Other noninterest expense (1,860) Mortgage servicing rights Level 3 72,532 Mortgage banking, net (63) Equity securities Level 3 13,444 Investment securities gains (losses), net 13,444 (a) Includes probable TDRs which are individually analyzed, net of the related allowance for loan losses. (b) If the fair value of the collateral exceeds the carrying amount of the asset, no charge off or adjustment is necessary, the asset is not considered to be carried at fair value, and is therefore not included in the table. (c) Represents individually evaluated impaired loans, net of the related allowance for loan losses. (d) Represents provision for credit losses on individually evaluated impaired loans. Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a nonrecurring basis include the fair value analysis in the goodwill impairment test, and intangible assets and other nonfinancial long-lived assets measured at fair value for 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, 2020 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Discount rate 9% - 14% 9% Mortgage servicing rights Discounted cash flow Constant prepayment rate 14% - 46% 20% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 0% - 42% 37% 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: September 30, 2020 December 31, 2019 ($ in Thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 401,151 $ 401,151 $ 373,380 $ 373,380 Interest-bearing deposits in other financial institutions Level 1 712,416 712,416 207,624 207,624 Federal funds sold and securities purchased under agreements to resell Level 1 95 95 7,740 7,740 Investment securities held to maturity, net Level 1 999 1,030 999 1,018 Investment securities held to maturity, net Level 2 1,989,870 2,123,351 2,204,084 2,275,447 Investment securities available for sale Level 1 26,650 26,650 — — Investment securities available for sale Level 2 3,231,711 3,231,711 3,262,586 3,262,586 Equity securities with readily determinable fair values Level 1 1,646 1,646 1,646 1,646 Equity securities without readily determinable fair values Level 3 13,444 13,444 13,444 13,444 FHLB and Federal Reserve Bank stocks Level 2 168,280 168,280 227,347 227,347 Residential loans held for sale Level 2 130,139 130,139 136,280 136,280 Commercial loans held for sale Level 2 19,360 19,360 15,000 15,000 Loans, net Level 3 24,619,041 24,532,881 22,620,068 22,399,621 Bank and corporate owned life insurance Level 2 679,257 679,257 671,948 671,948 Derivatives (other assets) (a) Level 2 256,557 256,557 101,778 101,778 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 7,888 7,888 2,527 2,527 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 24,685,695 $ 24,685,695 $ 21,156,261 $ 21,156,261 Brokered CDs and other time deposits (b) Level 2 2,026,852 2,039,995 2,622,803 2,622,803 Short-term funding (c) Level 2 206,316 206,316 465,113 465,113 Long-term funding (excluding PPPLF) Level 2 549,201 589,717 549,343 572,873 PPPLF Level 2 1,022,217 1,022,399 — — FHLB advances Level 2 1,706,763 1,851,567 3,180,967 3,207,793 Standby letters of credit (d) Level 2 2,489 2,489 2,710 2,710 Derivatives (accrued expenses and other liabilities) (a) Level 2 57,999 57,999 36,745 36,745 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 — — 710 710 (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 same counterparty where there is a legally enforceable master netting agreement in place. (b) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (c) The carrying amount is a reasonable estimate of fair value for existing short-term funding. (d) The commitment on standby letters of credit was $252 million at September 30, 2020 and $278 million at December 31, 2019. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit retirement account plan, the 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 Huntington branch acquisition closed on June 14, 2019, and the employees gained as a result of the transaction became eligible to participate in the RAP on the same date, with their vesting service credit based on their prior hours of service with Huntington. See Note 2 for additional information on the Huntington branch acquisition. The First Staunton acquisition closed on February 14, 2020, and the employees who met the required criteria as a result of the transaction 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, 2020 and 2019 were as follows: Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Components of Net Periodic Benefit Cost RAP Service cost $ 1,853 $ 1,598 $ 6,183 $ 5,448 Interest cost 2,124 2,489 6,139 7,314 Expected return on plan assets (6,386) (6,099) (19,196) (18,249) Amortization of prior service cost (18) (18) (55) (55) Amortization of actuarial loss (gain) 1,313 230 2,923 360 Total net periodic pension cost $ (1,114) $ (1,800) $ (4,006) $ (5,183) Postretirement Plan Interest cost $ 20 $ 26 $ 59 $ 78 Amortization of prior service cost (19) (19) (56) (56) Amortization of actuarial loss (gain) — (1) — (3) Total net periodic benefit cost $ 1 $ 6 $ 2 $ 19 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, 2020 and 2019.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2020
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 2019 Annual Report on Form 10-K and Note 3 in this Quarterly Report on Form 10-Q, 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 repricing 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 income (expense) in the accompanying tables. A credit provision 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 allowance model using the methodologies described in Note 3 in this Quarterly Report on Form 10-Q. 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, asset gains on disposed business units, loss on prepayment of FHLB advances, and income tax benefits as a result of tax planning strategies) 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 footnote in the Corporation’s 2019 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. The Community, Consumer, and Business segment serves individuals, as well as small and mid-sized businesses, by providing lending and deposit solutions. In addition, the Corporation offered insurance and risk consulting services. During the second quarter of 2020, the Corporation sold ABRC. 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). All First Staunton and Huntington branch acquisition related costs, the gain on sale of ABRC, the loss on the prepayment of FHLB advances, and the income tax benefit from tax planning strategies are included within the Risk Management and Shared Services segment. During the first quarter of 2020, the Corporation reassigned goodwill of approximately $4 million to the Corporate and Commercial Specialty segment from the Community, Consumer and Business segment as a result of a reorganization of the investment and fiduciary businesses. The goodwill reassigned was attributable to the Corporation's acquisition of Whitnell & Co. in 2017. Also effective in the first quarter of 2020, the marketing business unit, formerly part of the Risk Management and Shared Services segment, was reorganized under the Community, Consumer and Business segment. During the third quarter of 2020, the retirement plan services business unit, formerly part of the Community, Consumer, and Business segment, was reorganized under the Corporate and Commercial Specialty segment. In addition, the oil and gas business unit, formerly part of the Corporate and Commercial Specialty segment, was reorganized under the Risk Management and Shared Services segment as the Corporation's Credit team manages our exposure to the Corporation's higher-leveraged borrowers. Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 92,033 $ 111,060 $ 298,611 $ 339,222 Net intersegment interest income (expense) 6,937 (12,041) 3,123 (40,863) Segment net interest income 98,970 99,020 301,734 298,359 Noninterest income 37,405 33,671 111,254 101,135 Total revenue 136,376 132,691 412,987 399,495 Credit provision 15,572 12,248 41,456 37,417 Noninterest expense 52,144 57,946 159,471 174,570 Income (loss) before income taxes 68,660 62,497 212,060 187,508 Income tax expense (benefit) 12,600 11,249 39,461 35,472 Net income $ 56,060 $ 51,248 $ 172,599 $ 152,036 Allocated goodwill $ 530,144 $ 530,144 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 73,644 $ 73,777 $ 221,691 $ 230,476 Net intersegment interest income (expense) 9,231 25,437 42,213 68,930 Segment net interest income 82,875 99,214 263,904 299,406 Noninterest income 32,958 59,934 140,442 171,283 Total revenue 115,833 159,148 404,345 470,688 Credit provision 5,758 4,631 16,296 13,942 Noninterest expense 102,100 118,241 335,591 345,611 Income (loss) before income taxes 7,975 36,277 52,458 111,135 Income tax expense (benefit) 1,675 7,618 11,016 23,338 Net income $ 6,300 $ 28,658 $ 41,442 $ 87,797 Allocated goodwill $ 577,758 $ 646,086 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 16,472 $ 21,528 $ 54,662 $ 65,834 Net intersegment interest income (expense) (16,167) (13,396) (45,336) (28,067) Segment net interest income 305 8,131 9,326 37,767 Noninterest income (a) 5,182 7,245 176,646 15,472 Total revenue 5,487 15,376 185,973 53,239 Credit provision 21,679 (14,879) 99,257 (35,359) Noninterest expense (b) 73,343 24,743 108,122 70,198 Income (loss) before income taxes (89,535) 5,512 (21,407) 18,400 Income tax expense (benefit) (c) (72,389) 2,080 (47,135) 3,546 Net income $ (17,146) $ 3,432 $ 25,728 $ 14,854 Allocated goodwill $ — $ — Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 182,150 $ 206,365 $ 574,964 $ 635,532 Net intersegment interest income (expense) — — — — Segment net interest income 182,150 206,365 574,964 635,532 Noninterest income (a) 75,545 100,850 428,342 287,890 Total revenue 257,695 307,216 1,003,305 923,422 Credit provision 43,009 2,000 157,009 16,000 Noninterest expense (b) 227,587 200,930 603,184 590,380 Income (loss) before income taxes (12,900) 104,286 243,112 317,042 Income tax expense (benefit) c) (58,114) 20,947 3,342 62,356 Net income $ 45,214 $ 83,339 $ 239,769 $ 254,686 Allocated goodwill $ 1,107,902 $ 1,176,230 (a) For the nine months ended September 30, 2020, the Corporation recognized a $163 million asset gain related to the sale of ABRC. (b) For the three months ended September 30, 2020 and 2019, the Risk Management and Shared Services segment included approximately $218 thousand and $2 million respectively, of acquisition related noninterest expense. For the nine months ended September 30, 2020 and 2019, the Risk Management and Shared Services segment included approximately $2 million and $6 million respectively, of acquisition related noninterest expense. For the three and nine months ended September 30, 2020, the Risk Management and Shared Services segment also incurred a $45 million loss on the prepayment of FHLB advances.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2020
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, 2020 and 2019, 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, 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 Balance December 31, 2018 $ (75,643) $ (49,330) $ (124,972) Other comprehensive income (loss) before reclassifications 123,139 — 123,139 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (5,931) — (5,931) Personnel expense — (111) (111) Other expense — 357 357 Interest income 279 — 279 Income tax (expense) benefit (29,651) (62) (29,713) Net other comprehensive income (loss) during period 87,836 184 88,020 Balance September 30, 2019 $ 12,194 $ (49,146) $ (36,953) ($ in Thousands) Investments Defined Benefit Accumulated 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 Balance June 30, 2019 $ (9,773) $ (49,290) $ (59,063) Other comprehensive income (loss) before reclassifications 33,173 — 33,173 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities loss (gain), net (3,788) — (3,788) Personnel expense — (36) (36) Other expense — 229 229 Interest income (8) — (8) Income tax (expense) benefit (7,410) (49) (7,458) Net other comprehensive income (loss) during period 21,967 144 22,111 Balance September 30, 2019 $ 12,194 $ (49,146) $ (36,953)

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2020
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 September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ 21,152 $ 20,313 $ 61,496 $ 59,828 Service charges and deposit account fees 4,458 3,307 12,316 10,113 Card-based fees (b) 474 451 1,216 1,341 Insurance commissions and fees 57 109 179 283 Other revenue 1,400 690 2,481 1,743 Noninterest Income (in-scope of Topic 606) $ 27,541 $ 24,870 $ 77,688 $ 73,308 Noninterest Income (out-of-scope of Topic 606) 9,864 8,801 33,566 27,827 Total Noninterest Income $ 37,405 $ 33,671 $ 111,254 $ 101,135 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ — $ 792 $ 1,387 $ 2,148 Service charges and deposit account fees 9,816 13,243 28,653 36,945 Card-based fees (b) 9,699 10,004 27,392 28,490 Insurance commissions and fees 55 20,842 44,965 69,110 Other revenue 2,168 2,441 7,315 7,057 Noninterest Income (in-scope of Topic 606) $ 21,738 $ 47,322 $ 109,712 $ 143,750 Noninterest Income (out-of-scope of Topic 606) 11,220 12,612 30,730 27,533 Total Noninterest Income $ 32,958 $ 59,934 $ 140,442 $ 171,283 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ — $ (90) $ — $ (90) Service charges and deposit account fees 10 12 19 44 Card-based fees (b) 34 45 127 143 Insurance commissions and fees 2 3 8 10 Other revenue (82) 252 (33) 690 Noninterest Income (in-scope of Topic 606) $ (36) $ 222 $ 121 $ 797 Noninterest Income (out-of-scope of Topic 606) (c) 5,218 7,023 176,525 14,675 Total Noninterest Income $ 5,182 $ 7,245 $ 176,646 $ 15,472 Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ 21,152 $ 21,015 $ 62,884 $ 61,885 Service charges and deposit account fees 14,283 16,561 40,989 47,102 Card-based fees (b) 10,207 10,501 28,735 29,973 Insurance commissions and fees 114 20,954 45,153 69,403 Other revenue 3,487 3,383 9,763 9,490 Noninterest Income (in-scope of Topic 606) $ 49,243 $ 72,414 $ 187,521 $ 217,853 Noninterest Income (out-of-scope of Topic 606) (c) 26,302 28,436 240,821 70,037 Total Noninterest Income $ 75,545 $ 100,850 $ 428,342 $ 287,890 (a) Includes trust, asset management, brokerage, and annuity fees. (b) Certain card-based fees are out-of-scope of Topic 606. (c) T he nine months ended September 30, 2020 includes a gain of $163 million from 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 are 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 commissions and fees (b) Brokerage commissions and 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. Payments 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 commissions and fees are included in wealth management fees. Arrangements with Multiple Performance Obligations The Corporation's contracts with customers may include multiple performance obligations. For such arrangements, we allocate revenue to each performance obligation based on its relative standalone selling price. We generally determine standalone selling prices based on the expected cost plus margin. Practical Expedients We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less. Using the practical expedient, for contracts with a term of one year or less, the Corporation recognizes incremental costs of obtaining those contracts as an expense when incurred.

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. The Corporation also has finance leases for land. These operating leases have original terms of 1 year or longer with remaining maturities up to 42 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 September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Operating Lease Costs (a) $ 3,970 $ 2,708 $ 9,224 $ 8,502 Finance Lease Costs 39 — 115 — Operating Lease Cash Flows 2,871 2,968 8,303 8,538 Finance Lease Cash Flows 40 — 82 — (a) During the three and nine months ended September 30, 2020, the Corporation recognized approximately $1.5 million of operating lease costs associated with breaking leases on consolidating branches. The lease classifications on the consolidated balance sheets were as follows: ($ in Thousands) Consolidated Balance Sheets Category September 30, 2020 December 31, 2019 Amount Operating lease right-of-use asset Premises and equipment $ 35,963 $ 45,381 Finance lease right-of-use asset Other assets 1,069 2,188 Operating lease liability Accrued expenses and other liabilities 40,833 49,292 Finance lease liability Other long-term funding 1,165 2,209 The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: September 30, 2020 December 31, 2019 ($ 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 $ 386 2.74 0.47 % $ 46 0.83 2.72 % Retail and corporate offices 38,593 5.90 3.07 % 48,940 6.49 3.34 % Land 6,650 9.09 3.35 % 6,594 9.57 3.21 % Total operating leases $ 45,630 6.32 3.28 % $ 55,580 6.83 3.32 % Finance leases Land $ 1,185 1.89 1.05 % $ 4,827 39.67 3.99 % Total finance leases $ 1,185 1.89 1.05 % $ 4,827 39.67 3.99 % 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 Amount Three Months Ending December 31, 2020 $ 2,675 $ 40 $ 2,715 2021 10,158 172 10,330 2022 7,801 973 8,774 2023 5,559 — 5,559 2024 4,793 — 4,793 Beyond 2024 14,643 — 14,643 Total lease payments $ 45,630 $ 1,185 $ 46,815 Less: interest 4,797 20 4,817 Present value of lease payments $ 40,833 $ 1,165 $ 41,998

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
Investment Securities	Investment Securities Management measures expected credit losses on held to maturity securities on a collective basis by major security type. Accrued interest receivable on held to maturity securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts and is included in investment securities held to maturity, net on the consolidated balance sheets. For available for sale securities, the Corporation evaluates whether any decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses on investments is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses on investments is recognized in other comprehensive income. Changes in the allowance for credit losses on investments are recorded as provision for, or reversal of, credit loss expense. Losses are charged against the allowance when management believes the available for sale security is uncollectible or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on available for sale debt securities is excluded from the estimate of credit losses.
Allowance for Loan Losses	Allowance for Credit Losses on Loans The level of the allowance for loan losses represents management's estimate of an amount appropriate to provide for lifetime credit losses in the loan portfolio at the balance sheet date. The methodology applied by the Corporation is designed to assess the appropriateness of the allowance for loan losses within the Corporation's loan segmentation as well as management’s ongoing review and grading of the loan portfolio into criticized loan categories. The methodology focuses on evaluation of several factors, including but not limited to: evaluation of facts and issues related to specific loans, management's ongoing review and grading of the loan portfolio using a dual risk rating system consisting of probability of default and loss given default models, which are based on loan grades for commercial loans and credit reports for consumer loans applied based on portfolio segmentation leveraging industry breakouts in Commercial and Industrial (C&I) and property types in Commercial Real Estate (CRE) for commercial loans and loan types for consumer loans, consideration of historical credit loss and delinquency experience on each portfolio category, trends in past due and nonaccrual loans, the level of potential problem loans, the risk characteristics of the various classifications of loans, changes in the size and character of the loan portfolio, concentrations of loans to specific borrowers or industries, existing economic conditions and economic forecasts, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect potential loan losses. The Corporation utilizes the Moody's Baseline economic forecast in the allowance model and applies that forecast over a reasonable and supportable period with reversion to historical losses. For additional detail on the reasonable and supportable period and reversion assumptions, see Note 7. The Company estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flow of the loans. Potential problem loans are generally defined by management to include loans rated as substandard by management. Assessing these numerous factors involves significant judgment. The provision for loan losses is predominantly a function of the result of the methodology and other qualitative and quantitative factors used to determine the allowance for loan losses. Management individually analyzes loans that do not share similar risk characteristics to other loans in the portfolio. Management has determined that commercial loan relationships that have nonaccrual status or commercial and retail loans that have had their terms restructured in a TDR meet this definition. Probable TDRs are loans the Corporation has reviewed individually to determine whether there is a high likelihood that the loans will default and will require restructuring in the near future. Probable TDRs could be classified as Pass, Special Mention, Potential Problem or Nonaccrual within the Corporation's credit quality analysis depending on the specific circumstances surrounding the individual credits. Accrued interest receivable on loans is excluded from the estimate of credit losses.
Allowance for Unfunded Commitments	The allowance for unfunded commitments leverages the same methodology utilized to measure the allowance for loan losses. The Corporation estimates expected credit losses over the contractual period in which the Corporation is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Corporation. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. See Note 7 for additional information on the ACLL and Note 12 for additional information on the allowance for unfunded commitments. A portion of the ACLL is comprised of adjustments for qualitative factors not reflected in the quantitative model.
Impact of adopting ASU 2016-13 Financial Instruments - Credit Losses (Topic 326)	Impact of adopting ASU 2016-13 Financial Instruments - Credit Losses (Topic 326) The following table illustrates the adoption impact: December 31, 2019 January 1, 2020 ($ in Thousands) Allowance for Loan Losses Allowance for Unfunded Commitments CECL Day 1 Adjustment ACLL Beginning Balance Commercial and industrial $ 91,133 $ 12,276 $ 48,921 $ 152,330 Commercial real estate - owner occupied 10,284 127 (1,851) 8,560 Commercial and business lending 101,417 12,403 47,070 160,890 Commercial real estate - investor 40,514 530 2,287 43,331 Real estate construction 24,915 7,532 25,814 58,261 Commercial real estate lending 65,428 8,062 28,101 101,591 Total Commercial 166,846 20,465 75,171 262,482 Residential mortgage 16,960 — 33,215 50,175 Home equity 10,926 1,038 14,240 26,204 Other consumer 6,639 405 8,520 15,564 Total consumer 34,525 1,443 55,975 91,943 Total loans $ 201,371 $ 21,907 $ 131,147 $ 354,425 The allowance for credit losses on held to maturity securities was approximately $61,000 at January 1, 2020, attributable entirely to the Corporation's municipal securities. At January 1, 2020, the adoption of ASU 2016-13 resulted in an increase to the allowance for loan losses of $112 million and an increase to the allowance for unfunded commitments of $19 million for a total increase to the ACLL of $131 million. A corresponding after tax decrease to common equity of $98 million was recorded along with a deferred tax asset of $33 million.
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments The FASB issued an amendment to replace the current incurred loss impairment methodology. Under the new guidance, entities will be required to measure expected credit losses by utilizing forward-looking information to assess an entity's ACL. The guidance also requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. This amendment was effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption. ASU 2018-19 was issued to clarify that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. ASU 2019-04 was issued and provided entities alternatives for measurement of accrued interest receivable, clarified the steps entities should take when recording the transfer of loans or debt securities between measurement classifications or categories and clarifies that entities should include expected recoveries on financial assets. ASU 2019-05 was issued to provide entities that have certain instruments within the scope of Subtopic 320-20 with an option to irrevocably elect the fair value option in Subtopic 825-10. ASU 2020-02 was issued to further explain the measurement of current expected credit losses and the development, governance, and documentation of a systematic methodology. 1st Quarter 2020 The Corporation has adopted the Update using a modified retrospective approach. The Corporation has developed a CECL allowance model which calculates reserves over the life of the loan and is largely driven by portfolio characteristics, risk-grading, economic outlook, and key methodology assumptions. Those assumptions are based upon the existing probability of default and loss given default framework. At adoption, the Corporation utilized a single economic forecast over a 2-year reasonable and supportable forecast period. In the second year, the Corporation used straight-line reversion to historical losses. The Corporation recorded a $131 million adjustment to the ACL related to the adoption of this standard, which includes $61 thousand related to the held to maturity investment securities portfolio. The Corporation has elected to maintain pools accounted for under Subtopic 310-30 at adoption. The Corporation has elected to utilize the 2019 Capital Transition Relief for initial adoption, as well as the 2020 Capital Transition Relief as permitted under applicable regulations. The total impact at adoption equates to an approximately 29 bp net, after tax, reduction in the tangible common equity ratio. Results for the periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards. ASU 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement The FASB issued an amendment to add, modify, and remove disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the FASB Concepts Statement "Conceptual Framework for Financial Reporting," including the consideration of costs and benefits. The amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. 1st Quarter 2020 The Corporation has evaluated and determined it has an immaterial impact with minor changes in presentation. ASU 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment The FASB issued an amendment to simplify the subsequent quantitative measurement of goodwill by eliminating step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. This amendment was effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Entities should apply the amendment prospectively. 1st Quarter 2020 There has been no material impact on results of operations, financial position, and liquidity. The Corporation performs its annual impairment testing in May. Standard Description Date of adoption Effect on financial statements ASU 2020-03 Codification Improvements to Financial Instruments The FASB issued an amendment to further clarify that all entities are required to provide the fair value option disclosures in paragraphs 825-10-50-24 through 50-32. The amendment also states that paragraphs 820-10-35-2A(g) and 820-10-35-18L are to include the phrase nonfinancial items accounted for as derivatives under Topic 815 to be consistent with the previous amendments to Section 820-10-35 that were made by ASU No. 2018-09, Codification Improvements. The amendment also clarifies that the disclosure requirements in Topic 320 apply to the disclosure requirements in Topic 942 for depository and lending institutions along with improving the understandability of the guidance relating to subtopic 470-50 and subtopic 820-10. Lastly, the amendment clarifies that the contractual term of a net investment in a lease determined in accordance with Topic 842 should be the contractual term used to measure expected credit losses under Topic 326 and that when an entity regains control of financial assets sold, an ACL should be recorded in accordance with Topic 326. 1st Quarter 2020 The Corporation has evaluated and determined it has an immaterial impact. ASU 2020-04 Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting The FASB issued an amendment to provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendment only applies to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. 1st Quarter 2020 The Corporation has evaluated the impact of the Update and determined the expedients provided allow for simpler, more streamlined modifications to the financial instruments referencing LIBOR. A small population of loans have been modified under the new standard. Future Accounting Pronouncements The expected impact of accounting pronouncements recently issued or proposed but not yet required to be adopted are displayed in the table below: Standard Description Date of anticipated adoption Effect on financial statements ASU 2018-14 The FASB issued an amendment to modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments also added requirements to disclose the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The amendment also clarifies the disclosure requirements in paragraph 715-20-50-3, which states that certain information for defined benefit pension plans should be disclosed. The amendments in this Update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The amendment is effective for fiscal years ending after December 15, 2020. Entities should apply the amendments in this Update on a retrospective basis to all periods presented. Early adoption is permitted. 1st Quarter 2021 The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity. ASU 2020-01 Investments-Equity Securities (Topic 321), Investments-Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) The FASB issued an amendment to clarify the interaction of the accounting for equity securities under Topic 321 and investments accounted for under the equity method of accounting in Topic 323 and the accounting for certain forward contracts and purchased options accounted for under Topic 815. The amendments clarify that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. The amendments also clarify that for the purpose of applying paragraph 815-10-15-141(a) an entity should not consider whether, upon the settlement of the forward contract or exercise of the purchased option, individually or with existing investments, the underlying securities would be accounted for under the equity method in Topic 323 or the fair value option in accordance with the financial instruments guidance in Topic 825. An entity also would evaluate the remaining characteristics in paragraph 815-10-15-141 to determine the accounting for those forward contracts and purchased options. 1st Quarter 2021 The Corporation is currently evaluating the impact on its results of operations, financial position, and liquidity.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	Feb. 14, 2020	Jun. 14, 2019
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 available for sale (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 13,414 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 4,193 9,090 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	The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to Huntington branch acquisition: ($ in Thousands) Purchase Accounting Adjustments June 14, 2019 Assets Cash and cash equivalents $ — $ 551,250 Loans (1,552) 116,346 Premises and equipment, net 4,800 22,430 Goodwill 7,286 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 22,630 22,630 OREO (included in other assets on the face of the consolidated balance sheets) (2,561) 5,263 Other assets — 559 Total assets $ 725,764 Liabilities Deposits $ 156 $ 725,173 Other liabilities 70 590 Total liabilities $ 725,764
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

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table illustrates the adoption impact: December 31, 2019 January 1, 2020 ($ in Thousands) Allowance for Loan Losses Allowance for Unfunded Commitments CECL Day 1 Adjustment ACLL Beginning Balance Commercial and industrial $ 91,133 $ 12,276 $ 48,921 $ 152,330 Commercial real estate - owner occupied 10,284 127 (1,851) 8,560 Commercial and business lending 101,417 12,403 47,070 160,890 Commercial real estate - investor 40,514 530 2,287 43,331 Real estate construction 24,915 7,532 25,814 58,261 Commercial real estate lending 65,428 8,062 28,101 101,591 Total Commercial 166,846 20,465 75,171 262,482 Residential mortgage 16,960 — 33,215 50,175 Home equity 10,926 1,038 14,240 26,204 Other consumer 6,639 405 8,520 15,564 Total consumer 34,525 1,443 55,975 91,943 Total loans $ 201,371 $ 21,907 $ 131,147 $ 354,425

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2020
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 September 30, Nine Months Ended September 30, (In Thousands, except per share data) 2020 2019 2020 2019 Net income $ 45,214 $ 83,339 $ 239,769 $ 254,686 Preferred stock dividends (5,207) (3,801) (13,152) (11,402) Net income available to common equity $ 40,007 $ 79,539 $ 226,618 $ 243,285 Common shareholder dividends (27,676) (27,091) (83,607) (82,741) Unvested share-based payment awards (199) (198) (549) (506) Undistributed earnings $ 12,133 $ 52,250 $ 142,462 $ 160,037 Undistributed earnings allocated to common shareholders $ 12,045 $ 51,870 $ 141,426 $ 158,970 Undistributed earnings allocated to unvested share-based payment awards 87 380 1,036 1,067 Undistributed earnings $ 12,133 $ 52,250 $ 142,462 $ 160,037 Basic Distributed earnings to common shareholders $ 27,676 $ 27,091 $ 83,607 $ 82,741 Undistributed earnings allocated to common shareholders 12,045 51,870 141,426 158,970 Total common shareholders earnings, basic $ 39,721 $ 78,961 $ 225,032 $ 241,711 Diluted Distributed earnings to common shareholders $ 27,676 $ 27,091 $ 83,607 $ 82,741 Undistributed earnings allocated to common shareholders 12,045 51,870 141,426 158,970 Total common shareholders earnings, diluted $ 39,721 $ 78,961 $ 225,032 $ 241,711 Weighted average common shares outstanding 152,440 159,126 153,175 161,727 Effect of dilutive common stock awards 754 1,256 739 1,334 Diluted weighted average common shares outstanding 153,194 160,382 153,914 163,061 Basic earnings per common share $ 0.26 $ 0.50 $ 1.47 $ 1.49 Diluted earnings per common share $ 0.26 $ 0.49 $ 1.46 $ 1.48

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Fair value assumptions of stock options	The following assumptions were used in estimating the fair value for options granted in the first nine months of 2020 and full year 2019: 2020 2019 Dividend yield 3.50 % 3.30 % Risk-free interest rate 1.60 % 2.60 % Weighted average expected volatility 21.00 % 24.00 % Weighted average expected life 5.75 years 5.75 years Weighted average per share fair value of options $2.39 $4.00
Summary of company's stock option activities	A summary of the Corporation’s stock option activity for the nine months ended September 30, 2020 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2019 5,543 $ 20.13 6.25 years $ 16,043 Granted 1,697 18.43 Exercised (117) 13.89 Forfeited or expired (306) 21.48 Outstanding at September 30, 2020 6,817 $ 19.75 6.47 years $ 18 Options Exercisable at September 30, 2020 4,203 $ 19.21 5.07 years $ 18 (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, 2020: Restricted Stock Awards Shares (a) Weighted Average Outstanding at December 31, 2019 2,393 $ 22.39 Granted 1,043 18.21 Vested (905) 22.64 Forfeited (146) 20.65 Outstanding at September 30, 2020 2,385 $ 20.56 (a) In thousands

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	The amortized cost and fair values of securities available for sale and held to maturity at September 30, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities available for sale U. S. Treasury securities $ 26,541 $ 108 $ — $ 26,650 Agency securities 24,983 50 — 25,033 Obligations of state and political subdivisions (municipal securities) 450,174 24,521 — 474,695 Residential mortgage-related securities FNMA / FHLMC 1,267,003 9,554 (94) 1,276,463 GNMA 399,490 7,823 — 407,313 Commercial mortgage-related securities FNMA / FHLMC 19,724 2,153 — 21,877 GNMA 670,573 17,805 — 688,378 Asset backed securities FFELP 332,398 — (6,556) 325,843 SBA 9,159 — (48) 9,111 Other debt securities 3,000 — (3) 2,997 Total investment securities available for sale $ 3,203,046 $ 62,015 $ (6,701) $ 3,258,360 Investment securities held to maturity U. S. Treasury securities $ 999 $ 31 $ — $ 1,030 Obligations of state and political subdivisions (municipal securities) 1,444,325 115,343 (368) 1,559,300 Residential mortgage-related securities FNMA / FHLMC 63,142 3,147 — 66,289 GNMA 159,455 5,217 — 164,672 Commercial mortgage-related securities FNMA/FHLMC 11,220 — — 11,220 GNMA 311,798 10,142 — 321,941 Total investment securities held to maturity $ 1,990,940 $ 133,880 $ (368) $ 2,124,452 The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) $ 529,908 $ 16,269 $ (18) $ 546,160 Residential mortgage-related securities FNMA / FHLMC 131,158 1,562 (59) 132,660 GNMA 982,941 3,887 (1,689) 985,139 Commercial mortgage-related securities FNMA / FHLMC 19,929 1,799 — 21,728 GNMA 1,314,836 7,403 (12,032) 1,310,207 FFELP asset backed securities 270,178 — (6,485) 263,693 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 3,251,950 $ 30,920 $ (20,284) $ 3,262,586 Investment securities held to maturity U. S. Treasury securities $ 999 $ 19 $ — $ 1,018 Obligations of state and political subdivisions (municipal securities) 1,418,569 69,775 (1,118) 1,487,227 Residential mortgage-related securities FNMA / FHLMC 81,676 1,759 (15) 83,420 GNMA 269,523 1,882 (1,108) 270,296 GNMA commercial mortgage-related securities 434,317 6,308 (6,122) 434,503 Total investment securities held to maturity $ 2,205,083 $ 79,744 $ (8,363) $ 2,276,465
Investment securities held to maturity	The amortized cost and fair values of securities available for sale and held to maturity at September 30, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities available for sale U. S. Treasury securities $ 26,541 $ 108 $ — $ 26,650 Agency securities 24,983 50 — 25,033 Obligations of state and political subdivisions (municipal securities) 450,174 24,521 — 474,695 Residential mortgage-related securities FNMA / FHLMC 1,267,003 9,554 (94) 1,276,463 GNMA 399,490 7,823 — 407,313 Commercial mortgage-related securities FNMA / FHLMC 19,724 2,153 — 21,877 GNMA 670,573 17,805 — 688,378 Asset backed securities FFELP 332,398 — (6,556) 325,843 SBA 9,159 — (48) 9,111 Other debt securities 3,000 — (3) 2,997 Total investment securities available for sale $ 3,203,046 $ 62,015 $ (6,701) $ 3,258,360 Investment securities held to maturity U. S. Treasury securities $ 999 $ 31 $ — $ 1,030 Obligations of state and political subdivisions (municipal securities) 1,444,325 115,343 (368) 1,559,300 Residential mortgage-related securities FNMA / FHLMC 63,142 3,147 — 66,289 GNMA 159,455 5,217 — 164,672 Commercial mortgage-related securities FNMA/FHLMC 11,220 — — 11,220 GNMA 311,798 10,142 — 321,941 Total investment securities held to maturity $ 1,990,940 $ 133,880 $ (368) $ 2,124,452 The amortized cost and fair values of securities available for sale and held to maturity at December 31, 2019 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities available for sale Obligations of state and political subdivisions (municipal securities) $ 529,908 $ 16,269 $ (18) $ 546,160 Residential mortgage-related securities FNMA / FHLMC 131,158 1,562 (59) 132,660 GNMA 982,941 3,887 (1,689) 985,139 Commercial mortgage-related securities FNMA / FHLMC 19,929 1,799 — 21,728 GNMA 1,314,836 7,403 (12,032) 1,310,207 FFELP asset backed securities 270,178 — (6,485) 263,693 Other debt securities 3,000 — — 3,000 Total investment securities available for sale $ 3,251,950 $ 30,920 $ (20,284) $ 3,262,586 Investment securities held to maturity U. S. Treasury securities $ 999 $ 19 $ — $ 1,018 Obligations of state and political subdivisions (municipal securities) 1,418,569 69,775 (1,118) 1,487,227 Residential mortgage-related securities FNMA / FHLMC 81,676 1,759 (15) 83,420 GNMA 269,523 1,882 (1,108) 270,296 GNMA commercial mortgage-related securities 434,317 6,308 (6,122) 434,503 Total investment securities held to maturity $ 2,205,083 $ 79,744 $ (8,363) $ 2,276,465
Amortized cost and fair values of investment securities by contractual maturity	The expected maturities of investment securities available for sale and held to maturity at September 30, 2020 are shown below: Available for Sale Held to Maturity ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 8,343 $ 8,350 $ 28,957 $ 29,140 Due after one year through five years 82,198 82,964 63,630 65,751 Due after five years through ten years 344,172 362,247 161,769 170,223 Due after ten years 69,987 75,815 1,190,968 1,295,217 Total debt securities 504,699 529,375 1,445,325 1,560,331 Residential mortgage-related securities FNMA / FHLMC 1,267,003 1,276,463 63,142 66,289 GNMA 399,490 407,313 159,455 164,672 Commercial mortgage-related securities FNMA / FHLMC 19,724 21,877 11,220 11,220 GNMA 670,573 688,378 311,798 321,941 Asset backed securities FFELP 332,398 325,843 — — SBA 9,159 9,111 — — Total investment securities $ 3,203,046 $ 3,258,360 $ 1,990,940 $ 2,124,452 Ratio of fair value to amortized cost 101.7 % 106.7 %
Debt Securities, Held-to-maturity, Credit Quality Indicator	The following table summarizes the credit quality indicators of held to maturity securities at amortized cost at September 30, 2020: ($ in Thousands) AAA AA A Total U. S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,468 860,465 16,393 1,444,325 Residential mortgage-related securities FNMA/FHLMC 63,142 — — 63,142 GNMA 159,455 — — 159,455 Commercial mortgage-related securities FNMA/FHLMC 11,220 — — 11,220 GNMA 311,798 — — 311,798 Total held to maturity securities $ 1,114,082 $ 860,465 $ 16,393 $ 1,990,940
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, 2020 and 2019 are shown below: Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Gross gains on available for sale securities $ 7 $ 4,013 $ 9,312 $ 6,347 Gross gains on held to maturity securities — — — — Total gains 7 4,013 9,312 6,347 Gross (losses) on available for sale securities — (225) (90) (13,861) Gross (losses) on held to maturity securities — — — — Total (losses) — (225) (90) (13,861) Write-up of equity securities without readily determinable fair values — — — 13,444 Investment securities gains (losses), net $ 7 $ 3,788 $ 9,222 $ 5,931 Proceeds from sales of investment securities $ 8 $ 433,222 $ 626,283 $ 1,367,450
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 available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at September 30, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities available for sale Residential mortgage-related securities FNMA / FHLMC 5 $ (94) $ 77,157 — $ — $ — $ (94) $ 77,157 GNMA 1 — 424 — — — — 424 Asset backed securities FFELP 5 (837) 93,134 20 (5,719) 232,709 (6,556) 325,843 SBA 15 (48) 8,953 — — — (48) 8,953 Other debt securities 3 (3) 2,997 — — — (3) 2,997 Total 29 $ (982) $ 182,665 20 $ (5,719) $ 232,709 $ (6,701) $ 415,374 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 10 $ (368) $ 25,895 — $ — $ — $ (368) $ 25,895 Total 10 $ (368) $ 25,895 — $ — $ — $ (368) $ 25,895 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities available for sale Obligations of state and political subdivisions (municipal securities) 4 $ (18) $ 1,225 — $ — $ — $ (18) $ 1,225 Residential mortgage-related securities FNMA / FHLMC — — — 4 (59) 34,807 (59) 34,807 GNMA 18 (924) 322,394 3 (766) 79,461 (1,689) 401,856 GNMA commercial mortgage-related securities 22 (810) 258,218 42 (11,222) 621,307 (12,032) 879,524 FFELP asset backed securities 19 (6,092) 250,780 2 (393) 12,913 (6,485) 263,693 Other debt securities 2 — 2,000 — — — — 2,000 Total 65 $ (7,843) $ 834,616 51 $ (12,440) $ 748,487 $ (20,284) $ 1,583,104 Investment securities held to maturity Obligations of state and political subdivisions (municipal securities) 52 $ (1,105) $ 77,562 6 $ (13) $ 2,378 $ (1,118) $ 79,940 Residential mortgage-related securities FNMA / FHLMC 1 (6) 1,242 1 (9) 833 (15) 2,075 GNMA 12 (1,059) 187,261 8 (49) 6,587 (1,108) 193,849 GNMA commercial mortgage-related securities 2 (29) 26,202 21 (6,093) 357,733 (6,122) 383,935 Total 67 $ (2,199) $ 292,267 36 $ (6,164) $ 367,532 $ (8,363) $ 659,799

Loans Loans (Tables)

Loans Loans (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loan composition	The period end loan composition was as follows: ($ in Thousands) September 30, 2020 December 31, 2019 PPP $ 1,022,217 $ — Commercial and industrial 7,933,404 7,354,594 Commercial real estate — owner occupied 904,997 911,265 Commercial and business lending 9,860,618 8,265,858 Commercial real estate — investor 4,320,926 3,794,517 Real estate construction 1,859,609 1,420,900 Commercial real estate lending 6,180,536 5,215,417 Total commercial 16,041,154 13,481,275 Residential mortgage 7,885,523 8,136,980 Home equity 761,593 852,025 Other consumer 315,483 351,159 Total consumer 8,962,599 9,340,164 Total loans $ 25,003,753 $ 22,821,440
Commercial and consumer loans by credit quality indicator	The following table presents commercial and consumer loans by credit quality indicator by vintage year at September 30, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 995,646 $ — $ — $ — $ — $ — $ 995,646 Special Mention — — 7,409 — — — — — 7,409 Potential Problem — — 19,161 — — — — — 19,161 PPP $ — $ — $ 1,022,217 $ — $ — $ — $ — $ — $ 1,022,217 Commercial and industrial: Risk rating: Pass $ 4,904 $ 2,031,744 $ 1,102,032 $ 1,581,019 $ 1,430,036 $ 545,931 $ 326,862 $ 518,950 $ 7,536,572 Special Mention — 9,424 13,594 61,594 48,357 22 13,783 — 146,774 Potential Problem (c) 3,089 10,580 21,483 18,101 81,580 2,369 8,031 2,015 144,159 Nonaccrual (d) 568 200 1,571 6,761 15,728 44,933 29,193 7,513 105,899 Commercial and industrial $ 8,562 $ 2,051,948 $ 1,138,680 $ 1,667,475 $ 1,575,701 $ 593,255 $ 377,868 $ 528,478 $ 7,933,404 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,912 $ 120,161 $ 236,928 $ 137,669 $ 106,305 $ 155,023 $ 90,750 $ 865,748 Special Mention — — 2,420 2,410 1,106 556 2,671 5,236 14,398 Potential Problem — 2,593 678 7,804 1,354 1,135 5,127 4,117 22,808 Nonaccrual — — 168 — 371 326 — 1,177 2,043 Commercial real estate - owner occupied $ 1,150 $ 21,505 $ 123,426 $ 247,142 $ 140,499 $ 108,323 $ 162,821 $ 101,280 $ 904,997 Commercial and business lending: Risk rating: Pass $ 6,054 $ 2,050,656 $ 2,217,839 $ 1,817,947 $ 1,567,704 $ 652,236 $ 481,885 $ 609,700 $ 9,397,966 Special Mention — 9,424 23,423 64,004 49,462 578 16,454 5,236 168,582 Potential Problem (c) 3,089 13,173 41,323 25,905 82,934 3,504 13,158 6,132 186,129 Nonaccrual (d) 568 200 1,739 6,761 16,099 45,259 29,193 8,690 107,941 Commercial and business lending $ 9,712 $ 2,073,453 $ 2,284,323 $ 1,914,617 $ 1,716,200 $ 701,578 $ 540,690 $ 629,759 $ 9,860,618 Commercial real estate - investor: Risk rating: Pass $ 84 $ 189,623 $ 1,082,792 $ 1,030,772 $ 781,592 $ 321,341 $ 350,582 $ 245,290 $ 4,001,992 Special Mention — — 57,701 53,145 12,408 13,439 29,818 1,506 168,018 Potential Problem — 854 16,032 18,026 11,424 14,733 265 39,124 100,459 Nonaccrual 19,964 — 1,018 48,691 446 — — 304 50,458 Commercial real estate - investor $ 20,049 $ 190,477 $ 1,157,543 $ 1,150,634 $ 805,870 $ 349,513 $ 380,665 $ 286,224 $ 4,320,926 Real estate construction: Risk rating: Pass $ 1,151 $ 45,347 $ 545,859 $ 772,861 $ 376,567 $ 69,025 $ 2,588 $ 19,928 $ 1,832,176 Special Mention — — 411 — 24,437 — — 16 24,863 Potential Problem — — 127 — 355 1,557 95 45 2,178 Nonaccrual — — 12 — — — — 380 392 Real estate construction $ 1,151 $ 45,347 $ 546,409 $ 772,861 $ 401,358 $ 70,582 $ 2,683 $ 20,369 $ 1,859,609 Commercial real estate lending: Risk rating: Pass $ 1,236 $ 234,970 $ 1,628,651 $ 1,803,633 $ 1,158,158 $ 390,366 $ 353,170 $ 265,219 $ 5,834,167 Special Mention — — 58,112 53,145 36,845 13,439 29,818 1,522 192,881 Potential Problem — 854 16,159 18,026 11,779 16,289 360 39,169 102,637 Nonaccrual 19,964 — 1,030 48,691 446 — — 684 50,850 Commercial real estate lending $ 21,200 $ 235,823 $ 1,703,952 $ 1,923,495 $ 1,207,229 $ 420,095 $ 383,348 $ 306,593 $ 6,180,536 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 7,290 $ 2,285,626 $ 3,846,490 $ 3,621,580 $ 2,725,863 $ 1,042,603 $ 835,055 $ 874,918 $ 15,232,134 Special Mention — 9,424 81,534 117,150 86,307 14,017 46,272 6,758 361,463 Potential Problem 3,089 14,027 57,482 43,931 94,713 19,793 13,518 45,301 288,766 Nonaccrual 20,533 200 2,769 55,451 16,546 45,259 29,193 9,374 158,792 Total commercial $ 30,912 $ 2,309,277 $ 3,988,275 $ 3,838,112 $ 2,923,428 $ 1,121,672 $ 924,038 $ 936,352 $ 16,041,154 Residential mortgage: Risk rating: Pass $ — $ — $ 1,585,703 $ 1,608,973 $ 685,384 $ 1,119,248 $ 1,025,378 $ 1,794,997 $ 7,819,683 Special Mention — — 684 — 37 — — 392 1,113 Potential Problem — — 695 663 137 — 206 694 2,396 Nonaccrual — — 2,292 3,282 5,624 8,243 10,334 32,557 62,331 Residential mortgage $ — $ — $ 1,589,374 $ 1,612,918 $ 691,182 $ 1,127,490 $ 1,035,918 $ 1,828,640 $ 7,885,523 Home equity: Risk rating: Pass $ 10,470 $ 610,660 $ 2,041 $ 14,679 $ 18,022 $ 13,415 $ 6,700 $ 83,761 $ 749,277 Special Mention 107 39 — — — — — 369 408 Potential Problem — 1,632 — — — — — — 1,632 Nonaccrual 972 606 421 361 523 353 230 7,782 10,277 Home equity $ 11,549 $ 612,936 $ 2,462 $ 15,040 $ 18,545 $ 13,768 $ 6,930 $ 91,912 $ 761,593 Other consumer: Risk rating: Pass $ 27 $ 164,453 $ 7,298 $ 11,505 $ 4,438 $ 2,259 $ 1,475 $ 123,487 $ 314,916 Special Mention 5 369 — — — — 3 5 377 Nonaccrual 2 23 1 63 5 6 74 19 190 Other consumer $ 34 $ 164,845 $ 7,298 $ 11,568 $ 4,443 $ 2,265 $ 1,551 $ 123,511 $ 315,483 Total consumer: Risk rating: Pass $ 10,497 $ 775,112 $ 1,595,042 $ 1,635,157 $ 707,843 $ 1,134,922 $ 1,033,553 $ 2,002,246 $ 8,883,875 Special Mention 112 408 684 — 37 — 3 766 1,898 Potential Problem — 1,632 695 663 137 — 206 694 4,028 Nonaccrual 974 629 2,713 3,706 6,153 8,602 10,638 40,357 72,798 Total consumer $ 11,583 $ 777,781 $ 1,599,134 $ 1,639,527 $ 714,171 $ 1,143,524 $ 1,044,399 $ 2,044,063 $ 8,962,599 Total loans: Risk rating: Pass $ 17,787 $ 3,060,738 $ 5,441,532 $ 5,256,737 $ 3,433,706 $ 2,177,524 $ 1,868,608 $ 2,877,164 $ 24,116,009 Special Mention 112 9,832 82,219 117,150 86,344 14,017 46,275 7,524 363,361 Potential Problem 3,089 15,659 58,177 44,595 94,850 19,793 13,724 45,996 292,794 Nonaccrual 21,507 829 5,482 59,157 22,698 53,861 39,830 49,731 231,590 Total loans $ 42,495 $ 3,087,058 $ 5,587,409 $ 5,477,639 $ 3,637,599 $ 2,265,196 $ 1,968,437 $ 2,980,415 $ 25,003,753 (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) Includes $60 million of oil and gas related loans (d) Includes $8 million of oil and gas related loans The following table presents commercial and consumer loans by credit quality indicator at December 31, 2019 : ($ in Thousands) Pass Special Mention Potential Problem Nonaccrual Total Commercial and industrial $ 7,118,448 $ 79,525 $ 110,308 $ 46,312 $ 7,354,594 Commercial real estate - owner occupied 866,193 25,115 19,889 67 911,265 Commercial and business lending 7,984,641 104,641 130,197 46,380 8,265,858 Commercial real estate - investor 3,620,785 139,873 29,449 4,409 3,794,517 Real estate construction 1,420,374 33 — 493 1,420,900 Commercial real estate lending 5,041,159 139,906 29,449 4,902 5,215,417 Total commercial 13,025,800 244,547 159,646 51,282 13,481,275 Residential mortgage 8,077,122 563 1,451 57,844 8,136,980 Home equity 841,757 1,164 — 9,104 852,025 Other consumer 350,260 748 — 152 351,159 Total consumer 9,269,139 2,475 1,451 67,099 9,340,164 Total loans $ 22,294,939 $ 247,022 $ 161,097 $ 118,380 $ 22,821,440
Summarized details of Loans	The following table presents loans by past due status at September 30, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90 Days or Nonaccrual (b)(c) Total PPP $ 1,022,217 $ — $ — $ — $ — $ 1,022,217 Commercial and industrial 7,826,445 115 183 763 105,899 7,933,404 Commercial real estate - owner occupied 902,085 870 — — 2,043 904,997 Commercial and business lending 9,750,747 984 183 763 107,941 9,860,618 Commercial real estate - investor 4,270,059 409 — — 50,458 4,320,926 Real estate construction 1,859,106 95 16 — 392 1,859,609 Commercial real estate lending 6,129,165 504 16 — 50,850 6,180,536 Total commercial 15,879,912 1,488 199 763 158,792 16,041,154 Residential mortgage 7,816,986 5,793 392 22 62,331 7,885,523 Home equity 745,563 5,201 408 145 10,277 761,593 Other consumer 313,017 949 402 925 190 315,483 Total consumer 8,875,566 11,943 1,201 1,091 72,798 8,962,599 Total loans $ 24,755,478 $ 13,431 $ 1,400 $ 1,854 $ 231,590 $ 25,003,753 (a) Any deferred loans related to COVID-19 are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $186 million, or 80%, were current with respect to payment at September 30, 2020. (c) No interest income was recognized on nonaccrual loans for both the three and nine months ended September 30, 2020. In addition, there were $40 million of nonaccrual loans for which there was no related ACLL at September 30, 2020. The following table presents loans by past due status at December 31, 2019: Accruing ($ in Thousands) Current 30-59 Days 60-89 Days 90 Days or Nonaccrual (a) Total Commercial and industrial $ 7,307,118 $ 576 $ 245 $ 342 $ 46,312 $ 7,354,594 Commercial real estate - owner occupied 909,828 1,369 — — 67 911,265 Commercial and business lending 8,216,947 1,945 245 342 46,380 8,265,858 Commercial real estate - investor 3,788,296 1,812 — — 4,409 3,794,517 Real estate construction 1,420,310 64 33 — 493 1,420,900 Commercial real estate lending 5,208,606 1,876 33 — 4,902 5,215,417 Total commercial 13,425,552 3,821 278 342 51,282 13,481,275 Residential mortgage 8,069,863 8,749 525 — 57,844 8,136,980 Home equity 837,274 4,483 1,164 — 9,104 852,025 Other consumer 347,007 1,135 949 1,917 152 351,159 Total consumer 9,254,144 14,366 2,638 1,917 67,099 9,340,164 Total loans $ 22,679,696 $ 18,188 $ 2,916 $ 2,259 $ 118,380 $ 22,821,440 (a) Of the total nonaccrual loans, $48 million, or 41%, were current with respect to payment at December 31, 2019.
Summarized details of impaired Loans	The following table presents impaired loans individually evaluated under ASC Topic 310, excluding $2 million of purchased credit-impaired loans, at December 31, 2019 : ($ in Thousands) Recorded Unpaid Related Average Interest Loans with a related allowance Commercial and industrial $ 47,249 $ 63,346 $ 12,010 $ 45,290 $ 1,832 Commercial real estate — owner occupied 1,676 1,682 19 1,774 88 Commercial and business lending 48,924 65,028 12,029 47,064 1,919 Commercial real estate — investor 928 2,104 15 950 15 Real estate construction 477 559 67 494 30 Commercial real estate lending 1,405 2,663 82 1,445 45 Total commercial 50,329 67,691 12,111 48,509 1,965 Residential mortgage 21,450 22,625 2,740 23,721 856 Home equity 3,076 3,468 1,190 3,756 191 Other consumer 1,247 1,249 125 1,250 1 Total consumer 25,773 27,342 4,055 28,726 1,047 Total loans with a related allowance $ 76,102 $ 95,033 $ 16,165 $ 77,235 $ 3,012 Loans with no related allowance Commercial and industrial $ 14,787 $ 33,438 $ — $ 20,502 $ 63 Commercial real estate — owner occupied — — — — — Commercial and business lending 14,787 33,438 — 20,502 63 Commercial real estate — investor 3,705 3,705 — 3,980 159 Real estate construction — — — — — Commercial real estate lending 3,705 3,705 — 3,980 159 Total commercial 18,491 37,142 — 24,482 222 Residential mortgage 14,104 14,461 — 10,962 373 Home equity 1,346 1,383 — 1,017 21 Other consumer — — — — — Total consumer 15,450 15,845 — 11,979 394 Total loans with no related allowance $ 33,941 $ 52,987 $ — $ 36,462 $ 616 Total Commercial and industrial $ 62,035 $ 96,784 $ 12,010 $ 65,792 $ 1,895 Commercial real estate — owner occupied 1,676 1,682 19 1,774 88 Commercial and business lending 63,711 98,466 12,029 67,566 1,982 Commercial real estate — investor 4,633 5,808 15 4,931 174 Real estate construction 477 559 67 494 30 Commercial real estate lending 5,110 6,367 82 5,425 204 Total commercial 68,820 104,833 12,111 72,991 2,186 Residential mortgage 35,554 37,087 2,740 34,683 1,229 Home equity 4,422 4,851 1,190 4,773 211 Other consumer 1,247 1,249 125 1,250 1 Total consumer 41,223 43,187 4,055 40,706 1,441 Total loans (a) $ 110,043 $ 148,020 $ 16,165 $ 113,697 $ 3,628
Nonaccrual and performing restructured loans	The following table presents nonaccrual and performing restructured loans by loan portfolio: September 30, 2020 December 31, 2019 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 16,002 $ 7,827 $ 16,678 $ 7,376 Commercial real estate — owner occupied 1,389 168 1,676 — Commercial real estate — investor 635 — 293 — Real estate construction 382 98 298 179 Residential mortgage 5,378 14,535 3,955 13,035 Home equity 1,889 1,216 1,896 1,904 Other consumer 1,218 — 1,246 1 Total restructured loans (b) $ 26,891 $ 23,844 $ 26,041 $ 22,494 (a) Nonaccrual restructured loans have been included within nonaccrual loans. (b) Does not include any restructured loans related to COVID-19 in accordance with Section 4013 of the CARES Act.
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, 2020 and 2019: Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 3 $ 1,250 $ 1,324 1 $ 185 $ 185 Commercial real estate — owner occupied 2 453 751 — — — Commercial real estate — investor 1 530 530 — — — Real estate construction 1 102 102 — — — Residential mortgage 32 5,789 5,870 47 6,785 6,863 Home equity 18 676 702 18 520 520 Other consumer — — — 1 9 9 Total loans modified 57 $ 8,800 $ 9,280 67 $ 7,500 $ 7,577 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-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, 2020 and 2019 and the recorded investment in these restructured loans as of September 30, 2020 and 2019: Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 ($ in Thousands) Number of Recorded Number of Recorded Commercial real estate — investor — $ — 1 $ 461 Residential mortgage 5 1,036 27 4,528 Home equity 4 208 19 538 Total loans modified 9 $ 1,244 47 $ 5,526
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, 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 loan losses Sept. 30, 2020 ACLL / Loans Allowance for loan losses PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 968 $ 968 Commercial and industrial 91,133 52,919 144,052 (70,011) 5,210 (64,802) 293 408 87,840 167,793 Commercial real estate — owner occupied 10,284 (1,851) 8,433 (419) 4 (415) 890 255 2,027 11,190 Commercial and business lending 101,417 51,068 152,485 (70,430) 5,213 (65,216) 1,183 663 90,836 179,951 Commercial real estate — investor 40,514 2,041 42,555 (4,224) 643 (3,581) 753 472 50,004 90,201 Real estate construction 24,915 7,467 32,382 (42) 30 (12) 435 492 3,823 37,119 Commercial real estate lending 65,429 9,508 74,937 (4,266) 673 (3,593) 1,188 964 53,827 127,321 Total commercial 166,846 60,576 227,422 (74,696) 5,887 (68,810) 2,371 1,627 144,662 307,272 Residential mortgage 16,960 33,215 50,175 (1,615) 409 (1,206) 651 403 (6,382) 43,640 Home equity 10,926 11,649 22,575 (1,551) 1,476 (76) 422 374 (3,935) 19,361 Other consumer 6,639 7,016 13,655 (3,875) 845 (3,030) 61 140 3,612 14,438 Total consumer 34,525 51,880 86,405 (7,042) 2,730 (4,311) 1,134 917 (6,705) 77,440 Total loans $ 201,371 $ 112,457 $ 313,828 $ (81,738) $ 8,617 $ (73,121) $ 3,504 $ 2,543 $ 137,957 $ 384,711 Allowance for unfunded commitments Commercial and industrial 12,276 (3,998) 8,278 — — — — 61 12,851 21,190 Commercial real estate — owner occupied 127 — 127 — — — — 4 434 564 Commercial and business lending 12,403 (3,998) 8,405 — — — — 65 13,285 21,754 Commercial real estate — investor 530 246 776 — — — — 2 (58) 719 Real estate construction 7,532 18,347 25,879 — — — 45 2,703 28,626 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 2,644 29,345 Total commercial 20,465 14,595 35,060 — — — — 112 15,929 51,100 Home equity 1,038 2,591 3,629 — — — — 66 (106) 3,588 Other consumer 405 1,504 1,909 — — — — — 676 2,585 Total consumer 1,443 4,095 5,538 — — — — 66 571 6,176 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 16,500 $ 57,276 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 968 $ 968 0.09 % Commercial and industrial 103,409 48,921 152,330 (70,011) 5,210 (64,802) 293 469 100,691 188,983 2.38 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 4 (415) 890 259 2,461 11,755 1.30 % Commercial and business lending 113,820 47,070 160,890 (70,430) 5,213 (65,216) 1,183 728 104,120 201,706 2.05 % Commercial real estate — investor 41,044 2,287 43,331 (4,224) 643 (3,581) 753 474 49,945 90,921 2.10 % Real estate construction 32,447 25,814 58,261 (42) 30 (12) 435 537 6,525 65,745 3.54 % Commercial real estate lending 73,490 28,101 101,591 (4,266) 673 (3,593) 1,188 1,011 56,471 156,667 2.53 % Total commercial 187,311 75,171 262,482 (74,696) 5,887 (68,810) 2,371 1,739 160,591 358,372 2.23 % Residential mortgage 16,960 33,215 50,175 (1,615) 409 (1,206) 651 403 (6,380) 43,643 0.55 % Home equity 11,964 14,240 26,204 (1,551) 1,476 (76) 422 440 (4,041) 22,949 3.01 % Other consumer 7,044 8,520 15,564 (3,875) 845 (3,030) 61 140 4,287 17,023 5.40 % Total consumer 35,968 55,975 91,943 (7,042) 2,730 (4,311) 1,134 983 (6,134) 83,616 0.93 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (81,738) $ 8,617 $ (73,121) $ 3,504 $ 2,722 $ 154,457 $ 441,988 1.77 % The following table presents details of the allowance for loan losses segregated by loan portfolio segment as of December 31, 2019, calculated in accordance with prior incurred loss methodology applicable under ASC Topic 310: ($ in Thousands) December 31, 2018 Charge offs Recoveries Net Charge offs Provision for loan losses December 31, 2019 Allowance for loan losses Commercial and industrial $ 108,835 $ (63,315) $ 11,875 $ (51,441) $ 33,738 $ 91,133 Commercial real estate — owner occupied 9,255 (222) 2,795 2,573 (1,543) 10,284 Commercial and business lending 118,090 (63,537) 14,670 (48,868) 32,195 101,417 Commercial real estate — investor 40,844 — 31 31 (361) 40,514 Real estate construction 28,240 (60) 302 243 (3,568) 24,915 Commercial real estate lending 69,084 (60) 333 274 (3,929) 65,429 Total commercial 187,174 (63,597) 15,003 (48,594) 28,266 166,846 Residential mortgage 25,595 (3,322) 692 (2,630) (6,005) 16,960 Home equity 19,266 (1,846) 2,599 753 (9,093) 10,926 Other consumer 5,988 (5,548) 868 (4,681) 5,332 6,639 Total consumer 50,849 (10,716) 4,159 (6,558) (9,766) 34,525 Total loans $ 238,023 $ (74,313) $ 19,161 $ (55,152) $ 18,500 $ 201,371 A summary of the individually and collectively evaluated loans by portfolio segment at December 31, 2019, was as follows: Allowance for loan losses Loans ($ in Thousands) Individually evaluated for impairment Collectively evaluated for impairment Total allowance for loan losses Individually evaluated for impairment Collectively evaluated for impairment Acquired and accounted for under ASC 310-30 (a) Total loans Commercial and industrial $ 12,010 $ 79,123 $ 91,133 $ 62,035 $ 7,292,217 $ 342 $ 7,354,594 Commercial real estate — owner occupied 19 10,265 10,284 1,676 909,010 579 911,265 Commercial and business lending 12,029 89,388 101,417 63,711 8,201,227 921 8,265,858 Commercial real estate — investor 15 40,498 40,514 4,633 3,789,755 129 3,794,517 Real estate construction 67 24,848 24,915 477 1,420,416 7 1,420,900 Commercial real estate lending 82 65,346 65,429 5,110 5,210,171 136 5,215,417 Total commercial 12,111 154,734 166,846 68,821 13,411,398 1,057 13,481,275 Residential mortgage 2,740 14,220 16,960 35,554 8,100,958 469 8,136,980 Home equity 1,190 9,737 10,926 4,422 847,577 26 852,025 Other consumer 125 6,514 6,639 1,247 349,912 — 351,159 Total consumer 4,055 30,471 34,525 41,223 9,298,447 495 9,340,164 Total loans $ 16,165 $ 185,205 $ 201,371 $ 110,043 $ 22,709,845 $ 1,552 $ 22,821,440 (a) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 "Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality."

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2020
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 September 30, 2020 Year Ended December 31, 2019 Core deposit intangibles Gross carrying amount at the beginning of the year $ 80,730 $ 58,100 Additions during the period 7,379 22,630 Accumulated amortization (19,003) (12,456) Net book value $ 69,107 $ 68,274 Amortization during the year $ 6,547 $ 7,130 Other intangibles Gross carrying amount at the beginning of the year $ 38,970 $ 44,887 Additions during the period 200 — Reductions due to sale (17,435) (217) Accumulated amortization (20,335) (24,643) Net book value $ 1,400 $ 20,027 Amortization during the year $ 1,393 $ 2,818
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 September 30, 2020 Year Ended December 31, 2019 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 67,607 $ 68,433 Additions from acquisition 1,357 — Additions 11,495 11,606 Amortization (16,416) (12,432) Mortgage servicing rights at end of period $ 64,043 $ 67,607 Valuation allowance at beginning of period $ (302) $ (239) (Additions) recoveries, net (18,481) (63) Valuation allowance at end of period $ (18,782) $ (302) Mortgage servicing rights, net $ 45,261 $ 67,306 Fair value of mortgage servicing rights $ 45,303 $ 72,532 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 8,218,839 $ 8,488,969 Mortgage servicing rights, net to servicing portfolio 0.55 % 0.79 % Mortgage servicing rights expense (a) $ 34,897 $ 12,494
Summary of estimated future amortization expense	The following table shows the estimated future amortization expense for amortizing intangible assets: ($ in Thousands) Core Deposit Intangibles Other Intangibles Mortgage Servicing Rights Three Months Ending December 31, 2020 $ 2,203 $ 50 $ 4,245 2021 8,811 200 15,333 2022 8,811 200 10,935 2023 8,811 200 8,030 2024 8,811 200 6,095 2025 8,811 200 4,764 Beyond 2025 22,849 350 14,640 Total Estimated Amortization Expense $ 69,107 $ 1,400 $ 64,043

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	9 Months Ended
	Sep. 30, 2020
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), long-term funding (funding with original contractual maturities greater than one year), and FHLB advances (funding based on original contractual maturities): ($ in Thousands) September 30, 2020 December 31, 2019 Short-Term Funding Federal funds purchased $ 7,575 $ 362,000 Securities sold under agreements to repurchase 147,754 71,097 Federal funds purchased and securities sold under agreements to repurchase 155,329 433,097 Commercial paper 50,987 32,016 Total short-term funding $ 206,316 $ 465,113 Long-Term Funding Bank senior notes, at par, due 2021 $ 300,000 $ 300,000 Corporation subordinated notes, at par, due 2025 250,000 250,000 PPPLF 1,022,217 — Finance leases 1,165 2,209 Capitalized costs (1,964) (2,866) Total long-term funding 1,571,418 549,343 Total short and long-term funding, excluding FHLB advances $ 1,777,735 $ 1,014,456 FHLB Advances Short-term FHLB advances $ — $ 520,000 Long-term FHLB advances 1,706,763 2,660,967 Total FHLB advances $ 1,706,763 $ 3,180,967 Total short and long-term funding $ 3,484,498 $ 4,195,422
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, 2020 and December 31, 2019 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, 2020 Repurchase agreements Agency mortgage-related securities $ 147,754 $ — $ — $ — $ 147,754 Total $ 147,754 $ — $ — $ — $ 147,754 December 31, 2019 Repurchase agreements Agency mortgage-related securities $ 71,097 $ — $ — $ — $ 71,097 Total $ 71,097 $ — $ — $ — $ 71,097

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2020
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, 2020 and December 31, 2019. 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, 2020 and December 31, 2019. 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. September 30, 2020 December 31, 2019 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 $ 3,731,752 $ 225,912 $ 3,731,752 $ 28,960 $ 3,029,877 $ 77,024 $ 3,029,877 $ 13,073 Foreign currency exchange forwards 431,862 4,710 422,645 4,563 272,636 4,226 264,653 4,048 Commodity contracts 132,055 25,935 127,597 24,476 255,089 20,528 255,165 19,624 Mortgage banking (a)(b) 171,871 7,888 264,000 — 255,291 2,527 263,000 710 Gross derivatives before netting $ 264,445 $ 57,999 $ 104,305 $ 37,455 Less: Legally enforceable master netting agreements 2,524 2,524 10,410 10,410 Less: Cash collateral pledged/received 24,837 28,363 1,408 11,365 Total derivative instruments, after netting $ 237,084 $ 27,112 $ 92,487 $ 15,680 (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, 2020 and 2019: Location and Amount of Gain or (Loss) Recognized in Income on Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 ($ 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 $ (481) $ — $ (59) $ — $ (1,345) $ (262) $ 160 $ — The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (481) — 452 — (1,345) (262) 6,674 — Derivatives designated as hedging instruments (a) — — (511) — — — (6,514) — (a) Includes net settlements on the derivatives.
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, 2020 and 2019: Consolidated Statements of Income Category of Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ 507 $ (619) $ (2,648) $ (2,309) Foreign currency exchange forwards Capital markets, net 49 72 (31) 284 Commodity contracts Capital markets, net (86) 208 555 (2,037) Interest rate lock commitments (mortgage) Mortgage banking, net (4,948) (2,851) 5,361 (191) Forward commitments (mortgage) Mortgage banking, net 1,293 1,313 710 1,482

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
	Sep. 30, 2020
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 Investment Securities Received ($ in Thousands) Derivative Cash Collateral Received Net amount Derivative assets September 30, 2020 $ 27,408 $ (2,524) $ (24,837) $ 47 $ — $ 47 December 31, 2019 11,864 (10,410) (1,408) 45 — 45 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Investment Securities Pledged ($ in Thousands) Derivative Liabilities Offset Cash Collateral Pledged Net amount Derivative liabilities September 30, 2020 $ 31,164 $ (2,524) $ (28,363) $ 277 $ — $ 277 December 31, 2019 22,189 (10,410) (11,365) 413 — 413

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: ($ in Thousands) September 30, 2020 December 31, 2019 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 9,582,235 $ 9,024,412 Commercial letters of credit (a) 6,977 7,081 Standby letters of credit (c) 252,292 277,969 (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 current fair value, or the fair value is based on fees currently charged to enter into similar agreements and was not material at September 30, 2020 or December 31, 2019. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10. (c) The Corporation has established a liability of $2 million and $3 million for September 30, 2020 and December 31, 2019, respectively, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Nine Months Ended September 30, 2020 Year Ended December 31, 2019 Allowance for Unfunded Commitments Balance at beginning of period $ 21,907 $ 24,336 Cumulative effect of ASU 2016-13 adoption (CECL) 18,690 N/A Balance at beginning of period, adjusted 40,597 24,336 Provision for unfunded commitments 16,500 (2,500) Amount recorded at acquisition 179 70 Balance at end of period $ 57,276 $ 21,907

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
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, 2020 and December 31, 2019, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy September 30, 2020 December 31, 2019 Assets Investment securities available for sale U.S. Treasury securities Level 1 $ 26,650 $ — Agency securities Level 2 25,033 — Obligations of state and political subdivisions (municipal securities) Level 2 474,695 546,160 Residential mortgage-related securities FNMA / FHLMC Level 2 1,276,463 132,660 GNMA Level 2 407,313 985,139 Commercial mortgage-related securities FNMA / FHLMC Level 2 21,877 21,728 GNMA Level 2 688,378 1,310,207 Asset backed securities FFELP Level 2 325,843 263,693 SBA Level 2 9,111 — Other debt securities Level 2 2,997 3,000 Total investment securities available for sale Level 1 $ 26,650 $ — Total investment securities available for sale Level 2 3,231,711 3,262,586 Equity securities with readily determinable fair values Level 1 1,646 1,646 Residential loans held for sale Level 2 130,139 136,280 Interest rate-related instruments (a) Level 2 225,912 77,024 Foreign currency exchange forwards (a) Level 2 4,710 4,226 Commodity contracts (a) Level 2 25,935 20,528 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 7,888 2,527 Liabilities Interest rate-related instruments (a) Level 2 $ 28,960 $ 13,073 Foreign currency exchange forwards (a) Level 2 4,563 4,048 Commodity contracts (a) Level 2 24,476 19,624 Forward commitments to sell residential mortgage loans Level 3 — 710
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, 2020 and the year ended December 31, 2019, 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, 2018 $ 2,208 $ 2,072 $ 140 New production 24,164 (2,367) 26,531 Closed loans / settlements (29,375) (5,968) (23,407) Other 5,530 6,973 (1,443) Mortgage derivative gain (loss) 319 (1,362) 1,681 Balance December 31, 2019 $ 2,527 $ 710 $ 1,817 New production $ 59,550 $ (1,790) $ 61,340 Closed loans / settlements (60,000) (14,169) (45,831) Other 5,703 15,140 (9,437) Mortgage derivative gain (loss) 5,253 (819) 6,072 Balance September 30, 2020 $ 7,780 $ (108) $ 7,888
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, 2020 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, 2020: ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2019 $ 13,444 Carrying value changes — Carrying value as of September 30, 2020 $ 13,444 Cumulative upward carrying value changes between January 1, 2018 and September 30, 2020 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2020 $ —
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 Adjustment Recognized on the Consolidated Statements of Income ($ in Thousands) Fair Value Hierarchy Fair Value September 30, 2020 Assets Individually evaluated loans (a) Level 3 $ 117,451 Provision for credit losses $ (96,856) OREO (b) Level 2 10,953 Other noninterest expense (7,339) Mortgage servicing rights Level 3 45,303 Mortgage banking, net (18,481) December 31, 2019 Assets Impaired loans (c) Level 3 $ 45,792 Provision for credit losses (d) $ (66,172) OREO (b) Level 2 3,565 Other noninterest expense (1,860) Mortgage servicing rights Level 3 72,532 Mortgage banking, net (63) Equity securities Level 3 13,444 Investment securities gains (losses), net 13,444 (a) Includes probable TDRs which are individually analyzed, net of the related allowance for loan losses. (b) If the fair value of the collateral exceeds the carrying amount of the asset, no charge off or adjustment is necessary, the asset is not considered to be carried at fair value, and is therefore not included in the table. (c) Represents individually evaluated impaired loans, net of the related allowance for loan losses. (d) Represents provision for credit losses on individually evaluated impaired loans.
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, 2020 Valuation Technique Significant Unobservable Input Range of Inputs Weighted Average Input Applied Mortgage servicing rights Discounted cash flow Discount rate 9% - 14% 9% Mortgage servicing rights Discounted cash flow Constant prepayment rate 14% - 46% 20% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 0% - 42% 37%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: September 30, 2020 December 31, 2019 ($ in Thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 401,151 $ 401,151 $ 373,380 $ 373,380 Interest-bearing deposits in other financial institutions Level 1 712,416 712,416 207,624 207,624 Federal funds sold and securities purchased under agreements to resell Level 1 95 95 7,740 7,740 Investment securities held to maturity, net Level 1 999 1,030 999 1,018 Investment securities held to maturity, net Level 2 1,989,870 2,123,351 2,204,084 2,275,447 Investment securities available for sale Level 1 26,650 26,650 — — Investment securities available for sale Level 2 3,231,711 3,231,711 3,262,586 3,262,586 Equity securities with readily determinable fair values Level 1 1,646 1,646 1,646 1,646 Equity securities without readily determinable fair values Level 3 13,444 13,444 13,444 13,444 FHLB and Federal Reserve Bank stocks Level 2 168,280 168,280 227,347 227,347 Residential loans held for sale Level 2 130,139 130,139 136,280 136,280 Commercial loans held for sale Level 2 19,360 19,360 15,000 15,000 Loans, net Level 3 24,619,041 24,532,881 22,620,068 22,399,621 Bank and corporate owned life insurance Level 2 679,257 679,257 671,948 671,948 Derivatives (other assets) (a) Level 2 256,557 256,557 101,778 101,778 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 7,888 7,888 2,527 2,527 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 24,685,695 $ 24,685,695 $ 21,156,261 $ 21,156,261 Brokered CDs and other time deposits (b) Level 2 2,026,852 2,039,995 2,622,803 2,622,803 Short-term funding (c) Level 2 206,316 206,316 465,113 465,113 Long-term funding (excluding PPPLF) Level 2 549,201 589,717 549,343 572,873 PPPLF Level 2 1,022,217 1,022,399 — — FHLB advances Level 2 1,706,763 1,851,567 3,180,967 3,207,793 Standby letters of credit (d) Level 2 2,489 2,489 2,710 2,710 Derivatives (accrued expenses and other liabilities) (a) Level 2 57,999 57,999 36,745 36,745 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 — — 710 710 (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 same counterparty where there is a legally enforceable master netting agreement in place. (b) When the estimated fair value is less than the carrying value, the carrying value is reported as the fair value. (c) The carrying amount is a reasonable estimate of fair value for existing short-term funding. (d) The commitment on standby letters of credit was $252 million at September 30, 2020 and $278 million at December 31, 2019. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2020
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, 2020 and 2019 were as follows: Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Components of Net Periodic Benefit Cost RAP Service cost $ 1,853 $ 1,598 $ 6,183 $ 5,448 Interest cost 2,124 2,489 6,139 7,314 Expected return on plan assets (6,386) (6,099) (19,196) (18,249) Amortization of prior service cost (18) (18) (55) (55) Amortization of actuarial loss (gain) 1,313 230 2,923 360 Total net periodic pension cost $ (1,114) $ (1,800) $ (4,006) $ (5,183) Postretirement Plan Interest cost $ 20 $ 26 $ 59 $ 78 Amortization of prior service cost (19) (19) (56) (56) Amortization of actuarial loss (gain) — (1) — (3) Total net periodic benefit cost $ 1 $ 6 $ 2 $ 19

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 92,033 $ 111,060 $ 298,611 $ 339,222 Net intersegment interest income (expense) 6,937 (12,041) 3,123 (40,863) Segment net interest income 98,970 99,020 301,734 298,359 Noninterest income 37,405 33,671 111,254 101,135 Total revenue 136,376 132,691 412,987 399,495 Credit provision 15,572 12,248 41,456 37,417 Noninterest expense 52,144 57,946 159,471 174,570 Income (loss) before income taxes 68,660 62,497 212,060 187,508 Income tax expense (benefit) 12,600 11,249 39,461 35,472 Net income $ 56,060 $ 51,248 $ 172,599 $ 152,036 Allocated goodwill $ 530,144 $ 530,144 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 73,644 $ 73,777 $ 221,691 $ 230,476 Net intersegment interest income (expense) 9,231 25,437 42,213 68,930 Segment net interest income 82,875 99,214 263,904 299,406 Noninterest income 32,958 59,934 140,442 171,283 Total revenue 115,833 159,148 404,345 470,688 Credit provision 5,758 4,631 16,296 13,942 Noninterest expense 102,100 118,241 335,591 345,611 Income (loss) before income taxes 7,975 36,277 52,458 111,135 Income tax expense (benefit) 1,675 7,618 11,016 23,338 Net income $ 6,300 $ 28,658 $ 41,442 $ 87,797 Allocated goodwill $ 577,758 $ 646,086 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 16,472 $ 21,528 $ 54,662 $ 65,834 Net intersegment interest income (expense) (16,167) (13,396) (45,336) (28,067) Segment net interest income 305 8,131 9,326 37,767 Noninterest income (a) 5,182 7,245 176,646 15,472 Total revenue 5,487 15,376 185,973 53,239 Credit provision 21,679 (14,879) 99,257 (35,359) Noninterest expense (b) 73,343 24,743 108,122 70,198 Income (loss) before income taxes (89,535) 5,512 (21,407) 18,400 Income tax expense (benefit) (c) (72,389) 2,080 (47,135) 3,546 Net income $ (17,146) $ 3,432 $ 25,728 $ 14,854 Allocated goodwill $ — $ — Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Net interest income $ 182,150 $ 206,365 $ 574,964 $ 635,532 Net intersegment interest income (expense) — — — — Segment net interest income 182,150 206,365 574,964 635,532 Noninterest income (a) 75,545 100,850 428,342 287,890 Total revenue 257,695 307,216 1,003,305 923,422 Credit provision 43,009 2,000 157,009 16,000 Noninterest expense (b) 227,587 200,930 603,184 590,380 Income (loss) before income taxes (12,900) 104,286 243,112 317,042 Income tax expense (benefit) c) (58,114) 20,947 3,342 62,356 Net income $ 45,214 $ 83,339 $ 239,769 $ 254,686 Allocated goodwill $ 1,107,902 $ 1,176,230 (a) For the nine months ended September 30, 2020, the Corporation recognized a $163 million asset gain related to the sale of ABRC. (b) For the three months ended September 30, 2020 and 2019, the Risk Management and Shared Services segment included approximately $218 thousand and $2 million respectively, of acquisition related noninterest expense. For the nine months ended September 30, 2020 and 2019, the Risk Management and Shared Services segment included approximately $2 million and $6 million respectively, of acquisition related noninterest expense. For the three and nine months ended September 30, 2020, the Risk Management and Shared Services segment also incurred a $45 million loss on the prepayment of FHLB advances.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2020
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, 2020 and 2019, 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, 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 Balance December 31, 2018 $ (75,643) $ (49,330) $ (124,972) Other comprehensive income (loss) before reclassifications 123,139 — 123,139 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (5,931) — (5,931) Personnel expense — (111) (111) Other expense — 357 357 Interest income 279 — 279 Income tax (expense) benefit (29,651) (62) (29,713) Net other comprehensive income (loss) during period 87,836 184 88,020 Balance September 30, 2019 $ 12,194 $ (49,146) $ (36,953) ($ in Thousands) Investments Defined Benefit Accumulated 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 Balance June 30, 2019 $ (9,773) $ (49,290) $ (59,063) Other comprehensive income (loss) before reclassifications 33,173 — 33,173 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities loss (gain), net (3,788) — (3,788) Personnel expense — (36) (36) Other expense — 229 229 Interest income (8) — (8) Income tax (expense) benefit (7,410) (49) (7,458) Net other comprehensive income (loss) during period 21,967 144 22,111 Balance September 30, 2019 $ 12,194 $ (49,146) $ (36,953)

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue Recognition [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 September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ 21,152 $ 20,313 $ 61,496 $ 59,828 Service charges and deposit account fees 4,458 3,307 12,316 10,113 Card-based fees (b) 474 451 1,216 1,341 Insurance commissions and fees 57 109 179 283 Other revenue 1,400 690 2,481 1,743 Noninterest Income (in-scope of Topic 606) $ 27,541 $ 24,870 $ 77,688 $ 73,308 Noninterest Income (out-of-scope of Topic 606) 9,864 8,801 33,566 27,827 Total Noninterest Income $ 37,405 $ 33,671 $ 111,254 $ 101,135 Community, Consumer, and Business Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ — $ 792 $ 1,387 $ 2,148 Service charges and deposit account fees 9,816 13,243 28,653 36,945 Card-based fees (b) 9,699 10,004 27,392 28,490 Insurance commissions and fees 55 20,842 44,965 69,110 Other revenue 2,168 2,441 7,315 7,057 Noninterest Income (in-scope of Topic 606) $ 21,738 $ 47,322 $ 109,712 $ 143,750 Noninterest Income (out-of-scope of Topic 606) 11,220 12,612 30,730 27,533 Total Noninterest Income $ 32,958 $ 59,934 $ 140,442 $ 171,283 Risk Management and Shared Services Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ — $ (90) $ — $ (90) Service charges and deposit account fees 10 12 19 44 Card-based fees (b) 34 45 127 143 Insurance commissions and fees 2 3 8 10 Other revenue (82) 252 (33) 690 Noninterest Income (in-scope of Topic 606) $ (36) $ 222 $ 121 $ 797 Noninterest Income (out-of-scope of Topic 606) (c) 5,218 7,023 176,525 14,675 Total Noninterest Income $ 5,182 $ 7,245 $ 176,646 $ 15,472 Consolidated Total Three Months Ended September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Wealth management fees (a) $ 21,152 $ 21,015 $ 62,884 $ 61,885 Service charges and deposit account fees 14,283 16,561 40,989 47,102 Card-based fees (b) 10,207 10,501 28,735 29,973 Insurance commissions and fees 114 20,954 45,153 69,403 Other revenue 3,487 3,383 9,763 9,490 Noninterest Income (in-scope of Topic 606) $ 49,243 $ 72,414 $ 187,521 $ 217,853 Noninterest Income (out-of-scope of Topic 606) (c) 26,302 28,436 240,821 70,037 Total Noninterest Income $ 75,545 $ 100,850 $ 428,342 $ 287,890 (a) Includes trust, asset management, brokerage, and annuity fees. (b) Certain card-based fees are out-of-scope of Topic 606. (c) T he nine months ended September 30, 2020 includes a gain of $163 million from 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 are 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 commissions and fees (b) Brokerage commissions and 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. Payments 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 commissions and fees are included in wealth management fees.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
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 September 30, Nine Months Ended September 30, ($ in Thousands) 2020 2019 2020 2019 Operating Lease Costs (a) $ 3,970 $ 2,708 $ 9,224 $ 8,502 Finance Lease Costs 39 — 115 — Operating Lease Cash Flows 2,871 2,968 8,303 8,538 Finance Lease Cash Flows 40 — 82 — (a) During the three and nine months ended September 30, 2020, the Corporation recognized approximately $1.5 million of operating lease costs associated with breaking leases on consolidating branches.
Components of lease expense	The lease classifications on the consolidated balance sheets were as follows: ($ in Thousands) Consolidated Balance Sheets Category September 30, 2020 December 31, 2019 Amount Operating lease right-of-use asset Premises and equipment $ 35,963 $ 45,381 Finance lease right-of-use asset Other assets 1,069 2,188 Operating lease liability Accrued expenses and other liabilities 40,833 49,292 Finance lease liability Other long-term funding 1,165 2,209
Operating lease information	The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: September 30, 2020 December 31, 2019 ($ 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 $ 386 2.74 0.47 % $ 46 0.83 2.72 % Retail and corporate offices 38,593 5.90 3.07 % 48,940 6.49 3.34 % Land 6,650 9.09 3.35 % 6,594 9.57 3.21 % Total operating leases $ 45,630 6.32 3.28 % $ 55,580 6.83 3.32 % Finance leases Land $ 1,185 1.89 1.05 % $ 4,827 39.67 3.99 % Total finance leases $ 1,185 1.89 1.05 % $ 4,827 39.67 3.99 %
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 Amount Three Months Ending December 31, 2020 $ 2,675 $ 40 $ 2,715 2021 10,158 172 10,330 2022 7,801 973 8,774 2023 5,559 — 5,559 2024 4,793 — 4,793 Beyond 2024 14,643 — 14,643 Total lease payments $ 45,630 $ 1,185 $ 46,815 Less: interest 4,797 20 4,817 Present value of lease payments $ 40,833 $ 1,165 $ 41,998

Acquisitions Staunton Acquisiti

Acquisitions Staunton Acquisition (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Feb. 14, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
February 14, 2020
Goodwill			$ 13,000
Fair value of liabilities assumed				$ 480,028	$ 725,764
First Staunton Bancshares [Member]
Purchase Accounting Adjustments
Cash and cash equivalents		$ 0
Investment securities available for sale		(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		4,193
Deposits		1,285
Other borrowings		61
Accrued expenses and other liabilities		179
February 14, 2020
Cash and cash equivalents		44,782
Investment securities available for sale		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	$ 82,000	13,414	$ 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		9,090
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 Huntington Acquisi

Acquisitions Huntington Acquisition (Details) - USD ($) $ in Thousands	Jun. 14, 2019	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
June 14, 2019
Goodwill		$ 13,000
Fair value of liabilities assumed			$ 480,028	$ 725,764
Huntington National Bank
Purchase Accounting Adjustments
Cash and cash equivalents	$ 0
Loans	(1,552)
Premises and equipment, net	4,800
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	22,630
OREO (included in other assets on the face of the consolidated balance sheets)	(2,561)
Other assets	0
Deposits	156
Other liabilities	70
June 14, 2019
Cash and cash equivalents	551,250
Loans	116,346
Premises and equipment, net	22,430
Goodwill	7,286
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	22,630
OREO (included in other assets on the face of the consolidated balance sheets)	5,263
Other assets	559
Total assets	725,764
Deposits	725,173
Other liabilities	590
Fair value of liabilities assumed	$ 725,764

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	Sep. 22, 2020branch	Sep. 12, 2020branch	Sep. 11, 2020	Jun. 30, 2020USD ($)	Feb. 14, 2020USD ($)branch	Jun. 14, 2019USD ($)branch	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2020USD ($)
Business Acquisition [Line Items]
Goodwill								$ 13,000
Huntington National Bank
Business Acquisition [Line Items]
Effective Date of Acquisition						Jun. 14, 2019
Business Acquisition, Name of Acquired Entity						Huntington
Business Combination, Control Obtained Description	4% purchase premium on deposits transferred	4% purchase premium on deposits	4% purchase premium on deposits transferred			The Corporation paid a 4% premium on acquired deposits
New Communities | branch						13
Acquired Net Branches | branch						14
Goodwill						$ 7,286
Goodwill, Other Increase (Decrease)									$ (210)
Amortization period						10 years
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				$ 82,000	$ 13,414			$ 15,000
Goodwill, Other Increase (Decrease)							$ 2,000
PCD - HTM Securities					0
PCD - AFS Securities					$ 0
Amortization period					10 years
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
Southwest Wisconsin [Member]
Business Acquisition [Line Items]
Disposed Net Branches | branch		2
Monroe, WI [Member]
Business Acquisition [Line Items]
Disposed Net Branches | branch	1

Acquisitions and Dispositions (

Acquisitions and Dispositions (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 22, 2020	Sep. 12, 2020	Sep. 11, 2020	Dec. 31, 2019
Business Combinations [Abstract]
Deposits	$ 26,712,547	$ 38,000	$ 56,000	$ 208,000	$ 23,779,064

Summary of Significant Accoun_4

Summary of Significant Accounting Policies, Credit Loss Adoption Impact (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			$ 201,371
Allowance for Unfunded Commitments	$ 57,276		21,907
Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			166,846
Allowance for Unfunded Commitments			20,465
Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			34,525
Allowance for Unfunded Commitments			1,443
Commercial and industrial | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			91,133
Allowance for Unfunded Commitments			12,276
Commercial real estate — owner occupied | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			10,284
Allowance for Unfunded Commitments			127
Commercial and business lending | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			101,417
Allowance for Unfunded Commitments			12,403
Commercial real estate — investor | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			40,514
Allowance for Unfunded Commitments			530
Real Estate Construction | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			24,915
Allowance for Unfunded Commitments			7,532
Commercial Real Estate | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			65,428
Allowance for Unfunded Commitments			8,062
Residential mortgage | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			16,960
Allowance for Unfunded Commitments			0
Home Equity Loan | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			10,926
Allowance for Unfunded Commitments			1,038
Other consumer | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			6,639
Allowance for Unfunded Commitments			$ 405
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		$ 131,147
Cumulative Effect, Period Of Adoption, Adjustment | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		75,171
Cumulative Effect, Period Of Adoption, Adjustment | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		55,975
Cumulative Effect, Period Of Adoption, Adjustment | Commercial and industrial | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		48,921
Cumulative Effect, Period Of Adoption, Adjustment | Commercial real estate — owner occupied | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		(1,851)
Cumulative Effect, Period Of Adoption, Adjustment | Commercial and business lending | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		47,070
Cumulative Effect, Period Of Adoption, Adjustment | Commercial real estate — investor | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		2,287
Cumulative Effect, Period Of Adoption, Adjustment | Real Estate Construction | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		25,814
Cumulative Effect, Period Of Adoption, Adjustment | Commercial Real Estate | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		28,101
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgage | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		33,215
Cumulative Effect, Period Of Adoption, Adjustment | Home Equity Loan | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		14,240
Cumulative Effect, Period Of Adoption, Adjustment | Other consumer | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		8,520
Cumulative Effect, Period Of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		354,425
Allowance for Unfunded Commitments		40,597
Cumulative Effect, Period Of Adoption, Adjusted Balance | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		262,482
Cumulative Effect, Period Of Adoption, Adjusted Balance | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		91,943
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial and industrial | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		152,330
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial real estate — owner occupied | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		8,560
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial and business lending | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		160,890
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial real estate — investor | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		43,331
Cumulative Effect, Period Of Adoption, Adjusted Balance | Real Estate Construction | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		58,261
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial Real Estate | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		101,591
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgage | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		50,175
Cumulative Effect, Period Of Adoption, Adjusted Balance | Home Equity Loan | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		26,204
Cumulative Effect, Period Of Adoption, Adjusted Balance | Other consumer | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		$ 15,564

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held to maturity allowance for credit loss		$ 70	$ 61
Retained Earnings (Accumulated Deficit)		2,424,992		$ 2,380,867
Allowance for Unfunded Commitments		57,276		21,907
Allowance for Loan Losses				201,371
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			131,147
Allowance for Loan Losses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses		384,711		201,371
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Unfunded Commitments		$ 57,276		$ 21,907
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)			98,000
Deferred Income Tax Assets, Net			33,000
Accounting Standards Update 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reasonable and Supportable Period 2016-13	2 years
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Unfunded Commitments			18,690
Accounting Standards Update 2016-13 | Allowance for Loan Losses [Member] | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			112,457
Accounting Standards Update 2016-13 | SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Unfunded Commitments			18,690
Accounting Standards Update 2016-13 | Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for Loan Losses			$ 131,000

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, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Calculations for basic and diluted earnings per common share
Net income	$ 45,214	$ 148,718	$ 45,838	$ 83,339	$ 84,661	$ 86,686	$ 239,769	$ 254,686
Preferred stock dividends	(5,207)			(3,801)			(13,152)	(11,402)
Net income available to common equity	40,007			79,539			226,618	243,285
Common shareholder dividends	(27,676)			(27,091)			(83,607)	(82,741)
Unvested share-based payment awards	(199)			(198)			(549)	(506)
Undistributed earnings	12,133			52,250			142,462	160,037
Undistributed earnings allocated to common shareholders	12,045			51,870			141,426	158,970
Undistributed earnings allocated to unvested share-based payment awards	87			380			1,036	1,067
Undistributed earnings	12,133			52,250			142,462	160,037
Basic
Distributed earnings to common shareholders	27,676			27,091			83,607	82,741
Undistributed earnings allocated to common shareholders	12,045			51,870			141,426	158,970
Total common shareholders earnings, basic	39,721			78,961			225,032	241,711
Diluted
Distributed earnings to common shareholders	27,676			27,091			83,607	82,741
Undistributed earnings allocated to common shareholders	12,045			51,870			141,426	158,970
Total common shareholders earnings, diluted	$ 39,721			$ 78,961			$ 225,032	$ 241,711
Weighted average common shares outstanding	152,440			159,126			153,175	161,727
Effect of dilutive common stock awards	754			1,256			739	1,334
Diluted weighted average common shares outstanding	153,194			160,382			153,914	163,061
Basic earnings per common share	$ 0.26			$ 0.50			$ 1.47	$ 1.49
Diluted earnings per common share	$ 0.26			$ 0.49			$ 1.46	$ 1.48

Earnings Per Common Share (De_2

Earnings Per Common Share (Details Textuals) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
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	8	3	7	3

Stock-Based Compensation Fair V

Stock-Based Compensation Fair Value Assumptions of Stock Options (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Dividend yield	3.50%	3.30%
Risk-free interest rate	1.60%	2.60%
Weighted average expected volatility	21.00%	24.00%
Weighted average expected life	5 years 9 months	5 years 9 months
Weighted average per share fair value of options	$ 2.39	$ 4

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	5,543
Granted	1,697
Exercised	(117)
Forfeited or expired	(306)
Stock Options Shares Outstanding, Ending balance (in shares)	6,817	5,543
Options exercisable (in shares)	4,203
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)	$ 20.13
Granted	18.43
Exercised	13.89
Forfeited	21.48
Stock Option Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	19.75	$ 20.13
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 19.21
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 5 months 19 days	6 years 3 months
Options exercisable, Weighted Average Remaining Contractual Term	5 years 25 days
Stock Options Outstanding, Aggregate Intrinsic Value, Beginning balance	$ 16,043
Stock Options Outstanding, Aggregate Intrinsic Value, Ending balance	18	$ 16,043
Options exercisable, Aggregate Intrinsic Value	$ 18

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2020$ / 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	2,393
Granted | shares	1,043
Vested | shares	(905)
Forfeited | shares	(146)
Outstanding Shares, Ending balance (in shares) | shares	2,385
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	$ 22.39
Granted, Weighted Average Grant Date Fair Value | $ / shares	18.21
Vested, Weighted Average Grant Date Fair Value | $ / shares	22.64
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	20.65
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 20.56

Stock-Based Compensation (Detai

Stock-Based Compensation (Details Textuals) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Intrinsic value of stock options exercised	$ 1	$ 3
Total fair value of vested stock options	$ 4	4
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	$ 3	$ 4
Recognized compensation expense for accelerated vesting	2
Unvested share-based payment awards	$ 4
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	$ 15	$ 18
Recognized compensation expense for accelerated vesting	6
Unvested share-based payment awards	$ 18
Remaining requisite service periods, extend through	first quarter of 2024

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investment securities available for sale
Amortized Cost	$ 3,203,046	$ 3,251,950
Gross Unrealized Gains	62,015	30,920
Gross Unrealized (Losses)	(6,701)	(20,284)
Fair Value	3,258,360	3,262,586
Investment securities held to maturity
Investment securities held to maturity, net	1,990,940	2,205,083
Held-to-maturity, Gross Unrealized Gains	133,880	79,744
Held-to-maturity, Gross Unrealized Loss	(368)	(8,363)
Held-to-maturity, Fair Value	2,124,452	2,276,465
U. S. Treasury securities
Investment securities available for sale
Amortized Cost	26,541
Gross Unrealized Gains	108
Gross Unrealized (Losses)	0
Fair Value	26,650
Investment securities held to maturity
Investment securities held to maturity, net	999	999
Held-to-maturity, Gross Unrealized Gains	31	19
Held-to-maturity, Gross Unrealized Loss	0	0
Held-to-maturity, Fair Value	1,030	1,018
Agency Securities
Investment securities available for sale
Amortized Cost	24,983
Gross Unrealized Gains	50
Gross Unrealized (Losses)	0
Fair Value	25,033
Obligations of state and political subdivisions (municipal securities)
Investment securities available for sale
Amortized Cost	450,174	529,908
Gross Unrealized Gains	24,521	16,269
Gross Unrealized (Losses)	0	(18)
Fair Value	474,695	546,160
Investment securities held to maturity
Investment securities held to maturity, net	1,444,325	1,418,569
Held-to-maturity, Gross Unrealized Gains	115,343	69,775
Held-to-maturity, Gross Unrealized Loss	(368)	(1,118)
Held-to-maturity, Fair Value	1,559,300	1,487,227
FFELP
Investment securities available for sale
Amortized Cost	332,398	270,178
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(6,556)	(6,485)
Fair Value	325,843	263,693
Investment securities held to maturity
Investment securities held to maturity, net	0
Held-to-maturity, Fair Value	0
SBA
Investment securities available for sale
Amortized Cost	9,159
Gross Unrealized Gains	0
Gross Unrealized (Losses)	(48)
Fair Value	9,111
Investment securities held to maturity
Investment securities held to maturity, net	0
Held-to-maturity, Fair Value	0
Other debt securities
Investment securities available for sale
Amortized Cost	3,000	3,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(3)	0
Fair Value	2,997	3,000
FNMA / FHLMC | Residential mortgage-related securities
Investment securities available for sale
Amortized Cost	1,267,003	131,158
Gross Unrealized Gains	9,554	1,562
Gross Unrealized (Losses)	(94)	(59)
Fair Value	1,276,463	132,660
Investment securities held to maturity
Investment securities held to maturity, net	63,142	81,676
Held-to-maturity, Gross Unrealized Gains	3,147	1,759
Held-to-maturity, Gross Unrealized Loss	0	(15)
Held-to-maturity, Fair Value	66,289	83,420
FNMA / FHLMC | Commercial mortgage-related securities
Investment securities available for sale
Amortized Cost	19,724	19,929
Gross Unrealized Gains	2,153	1,799
Gross Unrealized (Losses)	0	0
Fair Value	21,877	21,728
Investment securities held to maturity
Investment securities held to maturity, net	11,220
Held-to-maturity, Gross Unrealized Gains	0
Held-to-maturity, Gross Unrealized Loss	0
Held-to-maturity, Fair Value	11,220
GNMA | Residential mortgage-related securities
Investment securities available for sale
Amortized Cost	399,490	982,941
Gross Unrealized Gains	7,823	3,887
Gross Unrealized (Losses)	0	(1,689)
Fair Value	407,313	985,139
Investment securities held to maturity
Investment securities held to maturity, net	159,455	269,523
Held-to-maturity, Gross Unrealized Gains	5,217	1,882
Held-to-maturity, Gross Unrealized Loss	0	(1,108)
Held-to-maturity, Fair Value	164,672	270,296
GNMA | Commercial mortgage-related securities
Investment securities available for sale
Amortized Cost	670,573	1,314,836
Gross Unrealized Gains	17,805	7,403
Gross Unrealized (Losses)	0	(12,032)
Fair Value	688,378	1,310,207
Investment securities held to maturity
Investment securities held to maturity, net	311,798	434,317
Held-to-maturity, Gross Unrealized Gains	10,142	6,308
Held-to-maturity, Gross Unrealized Loss	0	(6,122)
Held-to-maturity, Fair Value	$ 321,941	$ 434,503

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized Cost
Available for Sale, Due in one year or less	$ 8,343
Available for Sale, Due after one year through five years	82,198
Available for Sale, Due after five years through ten years	344,172
Available for Sale, Due after ten years	69,987
Available for Sale, Total debt securities	504,699
Available for Sale, amortized cost	3,203,046	$ 3,251,950
Fair Value
Available for Sale, Due in one year or less	8,350
Available for Sale, Due after one year through five years	82,964
Available for Sale, Due after five years through ten years	362,247
Available for Sale, Due after ten years	75,815
Available for Sale, Total debt securities	529,375
Investment securities available for sale, at fair value	$ 3,258,360	3,262,586
Available for Sale, Ratio of Fair Value to Amortized Cost	101.70%
Amortized Cost
Held to Maturity, Due in one year or less	$ 28,957
Held to Maturity, Due after one year through five years	63,630
Held to Maturity, Due after five years through ten years	161,769
Held to Maturity, Due after ten years	1,190,968
Held to Maturity, Total Debt Securities	1,445,325
Held to Maturity, Amortized Cost	1,990,940	2,205,083
Fair Value
Held to Maturity, Due in one year or less	29,140
Held to Maturity, Due after one year through five years	65,751
Held to Maturity, Due after five years through ten years	170,223
Held to Maturity, Due after ten years	1,295,217
Held to Maturity, Securities, Debt Securities	1,560,331
Held to Maturity, Total debt securities at fair value	$ 2,124,452	2,276,465
Held to Maturity, Ratio of Fair Value to Amortized Cost	106.70%
SBA
Amortized Cost
Available for Sale, amortized cost	$ 9,159
Fair Value
Investment securities available for sale, at fair value	9,111
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
FFELP
Amortized Cost
Available for Sale, amortized cost	332,398	270,178
Fair Value
Investment securities available for sale, at fair value	325,843	263,693
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
FNMA/FHLMC | Residential Related Securities
Amortized Cost
Available for Sale, amortized cost	1,267,003	131,158
Fair Value
Investment securities available for sale, at fair value	1,276,463	132,660
Amortized Cost
Held to Maturity, Amortized Cost	63,142	81,676
Fair Value
Held to Maturity, Total debt securities at fair value	66,289	83,420
FNMA/FHLMC | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost	19,724	19,929
Fair Value
Investment securities available for sale, at fair value	21,877	21,728
Amortized Cost
Held to Maturity, Amortized Cost	11,220
Fair Value
Held to Maturity, Total debt securities at fair value	11,220
GNMA | Residential Related Securities
Amortized Cost
Available for Sale, amortized cost	399,490	982,941
Fair Value
Investment securities available for sale, at fair value	407,313	985,139
Amortized Cost
Held to Maturity, Amortized Cost	159,455	269,523
Fair Value
Held to Maturity, Total debt securities at fair value	164,672	270,296
GNMA | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost	670,573	1,314,836
Fair Value
Investment securities available for sale, at fair value	688,378	1,310,207
Amortized Cost
Held to Maturity, Amortized Cost	311,798	434,317
Fair Value
Held to Maturity, Total debt securities at fair value	$ 321,941	$ 434,503

Investment Securities, HTM Cred

Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	$ 1,990,940	$ 2,205,083
US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	999	999
Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	1,444,325	$ 1,418,569
FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	63,142
GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	159,455
us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	11,220
GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	311,798
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	1,114,082
AAA | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	999
AAA | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	567,468
AAA | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	63,142
AAA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	159,455
AAA | us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	11,220
AAA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	311,798
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	860,465
AA | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
AA | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	860,465
AA | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
AA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
AA | us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
AA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	16,393
A | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
A | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	16,393
A | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
A | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
A | us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	0
A | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity, net	$ 0

Investment Securities Gain_Loss

Investment Securities Gain/Loss Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Gross gains on available for sale securities	$ 7	$ 4,013	$ 9,312	$ 6,347
Gross gains on held to maturity securities	0	0	0	0
Total gains	7	4,013	9,312	6,347
Gross (losses) on available for sale securities	0	(225)	(90)	(13,861)
Gross (losses) on held to maturity securities	0	0	0	0
Total (losses)	0	(225)	(90)	(13,861)
Write-up of equity securities without readily determinable fair values	0	0	0	13,444
Investment securities gains (losses), net	7	3,788	9,222	5,931
Proceeds from sales of investment securities	$ 8	$ 433,222	$ 626,283	$ 1,367,450

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Sep. 30, 2020USD ($)security	Dec. 31, 2019USD ($)security
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (982)	$ (7,843)
Unrealized losses on available for sale securities, 12 months or more	(5,719)	(12,440)
Total unrealized losses on available for sale securities	(6,701)	(20,284)
Fair value of unrealized losses on available for sale securities, less than 12 months	182,665	834,616
Fair value of unrealized losses on available for sale securities, 12 months or more	232,709	748,487
Total fair value of unrealized losses on available for sale securities	$ 415,374	$ 1,583,104
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	29	65
Available for sale, number of securities, 12 months or more | security	20	51
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	$ (368)	$ (2,199)
Unrealized losses on held to maturity securities, 12 months or more	0	(6,164)
Total unrealized losses on held to maturity securities	$ (368)	$ (8,363)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	0	36
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 25,895	$ 292,267
Fair value of unrealized losses on held to maturity securities, 12 months or more	0	367,532
Total fair value of unrealized losses on held to maturity securities	$ 25,895	$ 659,799
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	10	67
SBA
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (48)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(48)
Fair value of unrealized losses on available for sale securities, less than 12 months	8,953
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	$ 8,953
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	15
Available for sale, number of securities, 12 months or more | security	0
Obligations of state and political subdivisions (municipal securities)
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months		$ (18)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(18)
Fair value of unrealized losses on available for sale securities, less than 12 months		1,225
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		$ 1,225
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
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months	$ (368)	$ (1,105)
Unrealized losses on held to maturity securities, 12 months or more	0	(13)
Total unrealized losses on held to maturity securities	(368)	(1,118)
Fair value of unrealized losses on held to maturity securities, less than 12 months	25,895	77,562
Fair value of unrealized losses on held to maturity securities, 12 months or more	0	2,378
Total fair value of unrealized losses on held to maturity securities	$ 25,895	$ 79,940
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	10	52
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security	0	6
FFELP
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (837)	$ (6,092)
Unrealized losses on available for sale securities, 12 months or more	(5,719)	(393)
Total unrealized losses on available for sale securities	(6,556)	(6,485)
Fair value of unrealized losses on available for sale securities, less than 12 months	93,134	250,780
Fair value of unrealized losses on available for sale securities, 12 months or more	232,709	12,913
Total fair value of unrealized losses on available for sale securities	$ 325,843	$ 263,693
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	5	19
Available for sale, number of securities, 12 months or more | security	20	2
Other Debt securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (3)	$ 0
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(3)	0
Fair value of unrealized losses on available for sale securities, less than 12 months	2,997	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	$ 2,997	$ 2,000
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	3	2
Available for sale, number of securities, 12 months or more | security	0	0
FNMA/FHLMC | Residential Related Securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ (94)	$ 0
Unrealized losses on available for sale securities, 12 months or more	0	(59)
Total unrealized losses on available for sale securities	(94)	(59)
Fair value of unrealized losses on available for sale securities, less than 12 months	77,157	0
Fair value of unrealized losses on available for sale securities, 12 months or more	0	34,807
Total fair value of unrealized losses on available for sale securities	$ 77,157	$ 34,807
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	5	0
Available for sale, number of securities, 12 months or more | security	0	4
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months		$ (6)
Unrealized losses on held to maturity securities, 12 months or more		(9)
Total unrealized losses on held to maturity securities		(15)
Fair value of unrealized losses on held to maturity securities, less than 12 months		1,242
Fair value of unrealized losses on held to maturity securities, 12 months or more		833
Total fair value of unrealized losses on held to maturity securities		$ 2,075
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security		1
FNMA/FHLMC | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security		1
GNMA | Residential Related Securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (924)
Unrealized losses on available for sale securities, 12 months or more	0	(766)
Total unrealized losses on available for sale securities	0	(1,689)
Fair value of unrealized losses on available for sale securities, less than 12 months	424	322,394
Fair value of unrealized losses on available for sale securities, 12 months or more	0	79,461
Total fair value of unrealized losses on available for sale securities	$ 424	$ 401,856
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1	18
Available for sale, number of securities, 12 months or more | security	0	3
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months		$ (1,059)
Unrealized losses on held to maturity securities, 12 months or more		(49)
Total unrealized losses on held to maturity securities		(1,108)
Fair value of unrealized losses on held to maturity securities, less than 12 months		187,261
Fair value of unrealized losses on held to maturity securities, 12 months or more		6,587
Total fair value of unrealized losses on held to maturity securities		$ 193,849
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security		12
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security		8
GNMA | Commercial mortgage-related securities
Investment securities available for sale
Unrealized losses on available for sale securities, less than 12 months		$ (810)
Unrealized losses on available for sale securities, 12 months or more		(11,222)
Total unrealized losses on available for sale securities		(12,032)
Fair value of unrealized losses on available for sale securities, less than 12 months		258,218
Fair value of unrealized losses on available for sale securities, 12 months or more		621,307
Total fair value of unrealized losses on available for sale securities		$ 879,524
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security		22
Available for sale, number of securities, 12 months or more | security		42
Investment securities held to maturity
Unrealized losses on held to maturity securities, less than 12 months		$ (29)
Unrealized losses on held to maturity securities, 12 months or more		(6,093)
Total unrealized losses on held to maturity securities		(6,122)
Fair value of unrealized losses on held to maturity securities, less than 12 months		26,202
Fair value of unrealized losses on held to maturity securities, 12 months or more		357,733
Total fair value of unrealized losses on held to maturity securities		$ 383,935
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security		2
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities held to maturity
Number of held to maturity securities in a continuous unrealized loss position | security		21

Investment Securities (Details

Investment Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jan. 01, 2020
Investment Securities Information [Line Items]
Debt Securities, AFS, Principal Sold		$ 261,000	$ 281,000
Gain (Loss) on Sales of Mortgage Backed Securities (MBS)		$ 3,000	$ 6,000
Debt Securities, Available-for-sale, Sold at Par Value						$ 1,200,000
Pledged Financial Instruments, Not Separately Reported, Securities	$ 1,800,000				$ 1,800,000		$ 2,600,000
Interest Receivable	91,612				91,612		91,196
Debt Securities, Held-to-maturity, Nonaccrual, Interest Income					0		0
Debt Securities, Held-to-maturity, Past Due	0				0
Held to maturity allowance for credit loss	70				70			$ 61
Federal Home Loan Bank Stock	82,000				82,000		149,000
Federal Reserve Bank Stock	87,000				87,000		78,000
Equity securities with readily determinable fair values, Fair Value	$ 2,000				$ 2,000		2,000
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	$ 13,000				$ 13,000		13,000
Available-for-sale Securities1						$ 692,000
First Staunton Bancshares [Member]
Investment Securities Information [Line Items]
Carrying amount of Securities Sold			$ 84,000
Held-to-maturity Securities [Member]
Investment Securities Information [Line Items]
Interest Receivable	13,000				13,000		16,000
Available-for-sale Securities [Member]
Investment Securities Information [Line Items]
Interest Receivable	9,000				9,000		10,000
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Investment Securities Information [Line Items]
Interest Receivable	1,000				1,000		2,000
Federal Reserve Bank Stock [Member]
Investment Securities Information [Line Items]
Interest Receivable	$ 149				$ 149		$ 0

Loans Composition (Details)

Loans Composition (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 25,003,753	$ 22,821,440
PPP
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,022,217	0
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,933,404	7,354,594
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Loans	904,997	911,265
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	9,860,618	8,265,858
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Loans	4,320,926	3,794,517
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,859,609	1,420,900
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	6,180,536	5,215,417
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	16,041,154	13,481,275
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,885,523	8,136,980
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Loans	761,593	852,025
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	315,483	351,159
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 8,962,599	$ 9,340,164

Loans, Credit Quality Indicator

Loans, Credit Quality Indicator by Vintage Year (Details) $ in Thousands	Sep. 30, 2020USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	$ 42,495
Financing Receivable, Revolving	3,087,058
Financing Receivable, Originated in Current Fiscal Year	5,587,409
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,477,639
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,637,599
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,265,196
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,968,437
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,980,415
Total	25,003,753
Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	112
Financing Receivable, Revolving	9,832
Financing Receivable, Originated in Current Fiscal Year	82,219
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	117,150
Financing Receivable, Originated Two Years before Latest Fiscal Year	86,344
Financing Receivable, Originated Three Years before Latest Fiscal Year	14,017
Financing Receivable, Originated Four Years before Latest Fiscal Year	46,275
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,524
Total	363,361
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	17,787
Financing Receivable, Revolving	3,060,738
Financing Receivable, Originated in Current Fiscal Year	5,441,532
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,256,737
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,433,706
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,177,524
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,868,608
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,877,164
Total	24,116,009
Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,089
Financing Receivable, Revolving	15,659
Financing Receivable, Originated in Current Fiscal Year	58,177
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	44,595
Financing Receivable, Originated Two Years before Latest Fiscal Year	94,850
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,793
Financing Receivable, Originated Four Years before Latest Fiscal Year	13,724
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	45,996
Total	292,794
Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	21,507
Financing Receivable, Revolving	829
Financing Receivable, Originated in Current Fiscal Year	5,482
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	59,157
Financing Receivable, Originated Two Years before Latest Fiscal Year	22,698
Financing Receivable, Originated Three Years before Latest Fiscal Year	53,861
Financing Receivable, Originated Four Years before Latest Fiscal Year	39,830
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	49,731
Total	231,590
Oil and Gas Portfolio Segment [Member] | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	60,000
Oil and Gas Portfolio Segment [Member] | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	8,000
Total commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	30,912
Financing Receivable, Revolving	2,309,277
Financing Receivable, Originated in Current Fiscal Year	3,988,275
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,838,112
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,923,428
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,121,672
Financing Receivable, Originated Four Years before Latest Fiscal Year	924,038
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	936,352
Total	16,041,154
Total commercial | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	9,424
Financing Receivable, Originated in Current Fiscal Year	81,534
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	117,150
Financing Receivable, Originated Two Years before Latest Fiscal Year	86,307
Financing Receivable, Originated Three Years before Latest Fiscal Year	14,017
Financing Receivable, Originated Four Years before Latest Fiscal Year	46,272
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,758
Total	361,463
Total commercial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	7,290
Financing Receivable, Revolving	2,285,626
Financing Receivable, Originated in Current Fiscal Year	3,846,490
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,621,580
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,725,863
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,042,603
Financing Receivable, Originated Four Years before Latest Fiscal Year	835,055
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	874,918
Total	15,232,134
Total commercial | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,089
Financing Receivable, Revolving	14,027
Financing Receivable, Originated in Current Fiscal Year	57,482
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	43,931
Financing Receivable, Originated Two Years before Latest Fiscal Year	94,713
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,793
Financing Receivable, Originated Four Years before Latest Fiscal Year	13,518
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	45,301
Total	288,766
Total commercial | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	20,533
Financing Receivable, Revolving	200
Financing Receivable, Originated in Current Fiscal Year	2,769
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	55,451
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,546
Financing Receivable, Originated Three Years before Latest Fiscal Year	45,259
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,193
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	9,374
Total	158,792
Total commercial | PPP
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	1,022,217
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Total	1,022,217
Total commercial | PPP | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	7,409
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Total	7,409
Total commercial | PPP | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	995,646
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Total	995,646
Total commercial | PPP | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	19,161
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Total	19,161
Total commercial | Commercial And Industrial Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	8,562
Financing Receivable, Revolving	2,051,948
Financing Receivable, Originated in Current Fiscal Year	1,138,680
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,667,475
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,575,701
Financing Receivable, Originated Three Years before Latest Fiscal Year	593,255
Financing Receivable, Originated Four Years before Latest Fiscal Year	377,868
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	528,478
Total	7,933,404
Total commercial | Commercial And Industrial Financing Receivable [Member] | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	9,424
Financing Receivable, Originated in Current Fiscal Year	13,594
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	61,594
Financing Receivable, Originated Two Years before Latest Fiscal Year	48,357
Financing Receivable, Originated Three Years before Latest Fiscal Year	22
Financing Receivable, Originated Four Years before Latest Fiscal Year	13,783
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Total	146,774
Total commercial | Commercial And Industrial Financing Receivable [Member] | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4,904
Financing Receivable, Revolving	2,031,744
Financing Receivable, Originated in Current Fiscal Year	1,102,032
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,581,019
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,430,036
Financing Receivable, Originated Three Years before Latest Fiscal Year	545,931
Financing Receivable, Originated Four Years before Latest Fiscal Year	326,862
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	518,950
Total	7,536,572
Total commercial | Commercial And Industrial Financing Receivable [Member] | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,089
Financing Receivable, Revolving	10,580
Financing Receivable, Originated in Current Fiscal Year	21,483
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18,101
Financing Receivable, Originated Two Years before Latest Fiscal Year	81,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,369
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,031
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,015
Total	144,159
Total commercial | Commercial And Industrial Financing Receivable [Member] | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	568
Financing Receivable, Revolving	200
Financing Receivable, Originated in Current Fiscal Year	1,571
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,761
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,728
Financing Receivable, Originated Three Years before Latest Fiscal Year	44,933
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,193
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,513
Total	105,899
Total commercial | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,150
Financing Receivable, Revolving	21,505
Financing Receivable, Originated in Current Fiscal Year	123,426
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	247,142
Financing Receivable, Originated Two Years before Latest Fiscal Year	140,499
Financing Receivable, Originated Three Years before Latest Fiscal Year	108,323
Financing Receivable, Originated Four Years before Latest Fiscal Year	162,821
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	101,280
Total	904,997
Total commercial | Commercial real estate — owner occupied | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	2,420
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,410
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,106
Financing Receivable, Originated Three Years before Latest Fiscal Year	556
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,671
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,236
Total	14,398
Total commercial | Commercial real estate — owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,150
Financing Receivable, Revolving	18,912
Financing Receivable, Originated in Current Fiscal Year	120,161
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	236,928
Financing Receivable, Originated Two Years before Latest Fiscal Year	137,669
Financing Receivable, Originated Three Years before Latest Fiscal Year	106,305
Financing Receivable, Originated Four Years before Latest Fiscal Year	155,023
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	90,750
Total	865,748
Total commercial | Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	2,593
Financing Receivable, Originated in Current Fiscal Year	678
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	7,804
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,354
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,135
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,127
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,117
Total	22,808
Total commercial | Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	168
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	371
Financing Receivable, Originated Three Years before Latest Fiscal Year	326
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,177
Total	2,043
Total commercial | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	9,712
Financing Receivable, Revolving	2,073,453
Financing Receivable, Originated in Current Fiscal Year	2,284,323
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,914,617
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,716,200
Financing Receivable, Originated Three Years before Latest Fiscal Year	701,578
Financing Receivable, Originated Four Years before Latest Fiscal Year	540,690
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	629,759
Total	9,860,618
Total commercial | Commercial and business lending | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	9,424
Financing Receivable, Originated in Current Fiscal Year	23,423
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	64,004
Financing Receivable, Originated Two Years before Latest Fiscal Year	49,462
Financing Receivable, Originated Three Years before Latest Fiscal Year	578
Financing Receivable, Originated Four Years before Latest Fiscal Year	16,454
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5,236
Total	168,582
Total commercial | Commercial and business lending | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	6,054
Financing Receivable, Revolving	2,050,656
Financing Receivable, Originated in Current Fiscal Year	2,217,839
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,817,947
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,567,704
Financing Receivable, Originated Three Years before Latest Fiscal Year	652,236
Financing Receivable, Originated Four Years before Latest Fiscal Year	481,885
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	609,700
Total	9,397,966
Total commercial | Commercial and business lending | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,089
Financing Receivable, Revolving	13,173
Financing Receivable, Originated in Current Fiscal Year	41,323
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	25,905
Financing Receivable, Originated Two Years before Latest Fiscal Year	82,934
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,504
Financing Receivable, Originated Four Years before Latest Fiscal Year	13,158
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,132
Total	186,129
Total commercial | Commercial and business lending | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	568
Financing Receivable, Revolving	200
Financing Receivable, Originated in Current Fiscal Year	1,739
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,761
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,099
Financing Receivable, Originated Three Years before Latest Fiscal Year	45,259
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,193
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	8,690
Total	107,941
Total commercial | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	20,049
Financing Receivable, Revolving	190,477
Financing Receivable, Originated in Current Fiscal Year	1,157,543
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,150,634
Financing Receivable, Originated Two Years before Latest Fiscal Year	805,870
Financing Receivable, Originated Three Years before Latest Fiscal Year	349,513
Financing Receivable, Originated Four Years before Latest Fiscal Year	380,665
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	286,224
Total	4,320,926
Total commercial | Commercial real estate — investor | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	57,701
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	53,145
Financing Receivable, Originated Two Years before Latest Fiscal Year	12,408
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,439
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,818
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,506
Total	168,018
Total commercial | Commercial real estate — investor | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	84
Financing Receivable, Revolving	189,623
Financing Receivable, Originated in Current Fiscal Year	1,082,792
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,030,772
Financing Receivable, Originated Two Years before Latest Fiscal Year	781,592
Financing Receivable, Originated Three Years before Latest Fiscal Year	321,341
Financing Receivable, Originated Four Years before Latest Fiscal Year	350,582
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	245,290
Total	4,001,992
Total commercial | Commercial real estate — investor | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	854
Financing Receivable, Originated in Current Fiscal Year	16,032
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18,026
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,424
Financing Receivable, Originated Three Years before Latest Fiscal Year	14,733
Financing Receivable, Originated Four Years before Latest Fiscal Year	265
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39,124
Total	100,459
Total commercial | Commercial real estate — investor | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	19,964
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	1,018
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	48,691
Financing Receivable, Originated Two Years before Latest Fiscal Year	446
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	304
Total	50,458
Total commercial | Real Estate Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,151
Financing Receivable, Revolving	45,347
Financing Receivable, Originated in Current Fiscal Year	546,409
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	772,861
Financing Receivable, Originated Two Years before Latest Fiscal Year	401,358
Financing Receivable, Originated Three Years before Latest Fiscal Year	70,582
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,683
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	20,369
Total	1,859,609
Total commercial | Real Estate Construction | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	411
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	24,437
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	16
Total	24,863
Total commercial | Real Estate Construction | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,151
Financing Receivable, Revolving	45,347
Financing Receivable, Originated in Current Fiscal Year	545,859
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	772,861
Financing Receivable, Originated Two Years before Latest Fiscal Year	376,567
Financing Receivable, Originated Three Years before Latest Fiscal Year	69,025
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,588
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	19,928
Total	1,832,176
Total commercial | Real Estate Construction | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	127
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	355
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,557
Financing Receivable, Originated Four Years before Latest Fiscal Year	95
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	45
Total	2,178
Total commercial | Real Estate Construction | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	12
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	380
Total	392
Total commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	21,200
Financing Receivable, Revolving	235,823
Financing Receivable, Originated in Current Fiscal Year	1,703,952
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,923,495
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,207,229
Financing Receivable, Originated Three Years before Latest Fiscal Year	420,095
Financing Receivable, Originated Four Years before Latest Fiscal Year	383,348
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	306,593
Total	6,180,536
Total commercial | Commercial Real Estate | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	58,112
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	53,145
Financing Receivable, Originated Two Years before Latest Fiscal Year	36,845
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,439
Financing Receivable, Originated Four Years before Latest Fiscal Year	29,818
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,522
Total	192,881
Total commercial | Commercial Real Estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,236
Financing Receivable, Revolving	234,970
Financing Receivable, Originated in Current Fiscal Year	1,628,651
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,803,633
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,158,158
Financing Receivable, Originated Three Years before Latest Fiscal Year	390,366
Financing Receivable, Originated Four Years before Latest Fiscal Year	353,170
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	265,219
Total	5,834,167
Total commercial | Commercial Real Estate | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	854
Financing Receivable, Originated in Current Fiscal Year	16,159
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18,026
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,779
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,289
Financing Receivable, Originated Four Years before Latest Fiscal Year	360
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39,169
Total	102,637
Total commercial | Commercial Real Estate | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	19,964
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	1,030
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	48,691
Financing Receivable, Originated Two Years before Latest Fiscal Year	446
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	684
Total	50,850
Total consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	11,583
Financing Receivable, Revolving	777,781
Financing Receivable, Originated in Current Fiscal Year	1,599,134
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,639,527
Financing Receivable, Originated Two Years before Latest Fiscal Year	714,171
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,143,524
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,044,399
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,044,063
Total	8,962,599
Total consumer | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	112
Financing Receivable, Revolving	408
Financing Receivable, Originated in Current Fiscal Year	684
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	37
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	766
Total	1,898
Total consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	10,497
Financing Receivable, Revolving	775,112
Financing Receivable, Originated in Current Fiscal Year	1,595,042
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,635,157
Financing Receivable, Originated Two Years before Latest Fiscal Year	707,843
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,134,922
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,033,553
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,002,246
Total	8,883,875
Total consumer | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	1,632
Financing Receivable, Originated in Current Fiscal Year	695
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	663
Financing Receivable, Originated Two Years before Latest Fiscal Year	137
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	206
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	694
Total	4,028
Total consumer | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	974
Financing Receivable, Revolving	629
Financing Receivable, Originated in Current Fiscal Year	2,713
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,706
Financing Receivable, Originated Two Years before Latest Fiscal Year	6,153
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,602
Financing Receivable, Originated Four Years before Latest Fiscal Year	10,638
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	40,357
Total	72,798
Total consumer | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	1,589,374
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,612,918
Financing Receivable, Originated Two Years before Latest Fiscal Year	691,182
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,127,490
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,035,918
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,828,640
Total	7,885,523
Total consumer | Residential mortgage | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	684
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	37
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	392
Total	1,113
Total consumer | Residential mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	1,585,703
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,608,973
Financing Receivable, Originated Two Years before Latest Fiscal Year	685,384
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,119,248
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,025,378
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,794,997
Total	7,819,683
Total consumer | Residential mortgage | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	695
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	663
Financing Receivable, Originated Two Years before Latest Fiscal Year	137
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	206
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	694
Total	2,396
Total consumer | Residential mortgage | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	2,292
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,282
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,624
Financing Receivable, Originated Three Years before Latest Fiscal Year	8,243
Financing Receivable, Originated Four Years before Latest Fiscal Year	10,334
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	32,557
Total	62,331
Total consumer | Home Equity Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	11,549
Financing Receivable, Revolving	612,936
Financing Receivable, Originated in Current Fiscal Year	2,462
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,040
Financing Receivable, Originated Two Years before Latest Fiscal Year	18,545
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,768
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,930
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	91,912
Total	761,593
Total consumer | Home Equity Loan | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	107
Financing Receivable, Revolving	39
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	369
Total	408
Total consumer | Home Equity Loan | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	10,470
Financing Receivable, Revolving	610,660
Financing Receivable, Originated in Current Fiscal Year	2,041
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14,679
Financing Receivable, Originated Two Years before Latest Fiscal Year	18,022
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,415
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,700
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	83,761
Total	749,277
Total consumer | Home Equity Loan | Potential Problem
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	1,632
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Total	1,632
Total consumer | Home Equity Loan | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	972
Financing Receivable, Revolving	606
Financing Receivable, Originated in Current Fiscal Year	421
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	361
Financing Receivable, Originated Two Years before Latest Fiscal Year	523
Financing Receivable, Originated Three Years before Latest Fiscal Year	353
Financing Receivable, Originated Four Years before Latest Fiscal Year	230
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,782
Total	10,277
Total consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	34
Financing Receivable, Revolving	164,845
Financing Receivable, Originated in Current Fiscal Year	7,298
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,568
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,443
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,265
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,551
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	123,511
Total	315,483
Total consumer | Other consumer | Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5
Financing Receivable, Revolving	369
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5
Total	377
Total consumer | Other consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	27
Financing Receivable, Revolving	164,453
Financing Receivable, Originated in Current Fiscal Year	7,298
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	11,505
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,438
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,259
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,475
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	123,487
Total	314,916
Total consumer | Other consumer | Nonaccrual
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2
Financing Receivable, Revolving	23
Financing Receivable, Originated in Current Fiscal Year	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	63
Financing Receivable, Originated Two Years before Latest Fiscal Year	5
Financing Receivable, Originated Three Years before Latest Fiscal Year	6
Financing Receivable, Originated Four Years before Latest Fiscal Year	74
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	19
Total	$ 190

Loans Credit Quality Indicator

Loans Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 25,003,753	$ 22,821,440
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		22,294,939
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		247,022
Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		161,097
Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		118,380
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,933,404	7,354,594
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,118,448
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		79,525
Commercial and industrial | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		110,308
Commercial and industrial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		46,312
Commercial real estate — owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	904,997	911,265
Commercial real estate — owner occupied | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		866,193
Commercial real estate — owner occupied | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		25,115
Commercial real estate — owner occupied | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		19,889
Commercial real estate — owner occupied | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		67
Commercial and business lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,860,618	8,265,858
Commercial and business lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,984,641
Commercial and business lending | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		104,641
Commercial and business lending | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		130,197
Commercial and business lending | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		46,380
Commercial real estate — investor
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,320,926	3,794,517
Commercial real estate — investor | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		3,620,785
Commercial real estate — investor | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		139,873
Commercial real estate — investor | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		29,449
Commercial real estate — investor | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		4,409
Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,859,609	1,420,900
Real estate construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,420,374
Real estate construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		33
Real estate construction | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Real estate construction | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		493
Commercial real estate lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	6,180,536	5,215,417
Commercial real estate lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		5,041,159
Commercial real estate lending | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		139,906
Commercial real estate lending | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		29,449
Commercial real estate lending | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		4,902
Total commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	16,041,154	13,481,275
Total commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		13,025,800
Total commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		244,547
Total commercial | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		159,646
Total commercial | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		51,282
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,885,523	8,136,980
Residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		8,077,122
Residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		563
Residential mortgage | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,451
Residential mortgage | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		57,844
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	761,593	852,025
Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		841,757
Home equity | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,164
Home equity | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Home equity | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		9,104
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	315,483	351,159
Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		350,260
Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		748
Other consumer | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0
Other consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		152
Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 8,962,599	9,340,164
Total consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		9,269,139
Total consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,475
Total consumer | Potential Problem
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,451
Total consumer | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		$ 67,099

Loans Past Due Status (Details)

Loans Past Due Status (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Summarized details of Loans
Current(a)	$ 24,755,478	$ 24,755,478	$ 22,679,696
Nonaccrual(b)(c)	231,590	231,590	118,380
Loans and Leases Receivable, Net of Deferred Income, Total	25,003,753	25,003,753	22,821,440
Nonaccrual Loans, Current Portion	$ 186,000	$ 186,000	$ 48,000
Percent of current nonaccrual loans	80.00%	80.00%	41.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	40,000	40,000
30-59 Days Past Due
Summarized details of Loans
Total Past Due	13,431	13,431	$ 18,188
60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,400	1,400	2,916
90 Days or More Past Due
Summarized details of Loans
Total Past Due	1,854	1,854	2,259
PPP
Summarized details of Loans
Current(a)	1,022,217	1,022,217
Nonaccrual(b)(c)	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	1,022,217	1,022,217	0
PPP | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0
PPP | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0
PPP | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial and industrial
Summarized details of Loans
Current(a)	7,826,445	7,826,445	7,307,118
Nonaccrual(b)(c)	105,899	105,899	46,312
Loans and Leases Receivable, Net of Deferred Income, Total	7,933,404	7,933,404	7,354,594
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	115	115	576
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	183	183	245
Commercial and industrial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	763	763	342
Commercial real estate — owner occupied
Summarized details of Loans
Current(a)	902,085	902,085	909,828
Nonaccrual(b)(c)	2,043	2,043	67
Loans and Leases Receivable, Net of Deferred Income, Total	904,997	904,997	911,265
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	870	870	1,369
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate — owner occupied | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial and business lending
Summarized details of Loans
Current(a)	9,750,747	9,750,747	8,216,947
Nonaccrual(b)(c)	107,941	107,941	46,380
Loans and Leases Receivable, Net of Deferred Income, Total	9,860,618	9,860,618	8,265,858
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	984	984	1,945
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	183	183	245
Commercial and business lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	763	763	342
Commercial real estate — investor
Summarized details of Loans
Current(a)	4,270,059	4,270,059	3,788,296
Nonaccrual(b)(c)	50,458	50,458	4,409
Loans and Leases Receivable, Net of Deferred Income, Total	4,320,926	4,320,926	3,794,517
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	409	409	1,812
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate — investor | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0	0
Real estate construction
Summarized details of Loans
Current(a)	1,859,106	1,859,106	1,420,310
Nonaccrual(b)(c)	392	392	493
Loans and Leases Receivable, Net of Deferred Income, Total	1,859,609	1,859,609	1,420,900
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	95	95	64
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	16	16	33
Real estate construction | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate lending
Summarized details of Loans
Current(a)	6,129,165	6,129,165	5,208,606
Nonaccrual(b)(c)	50,850	50,850	4,902
Loans and Leases Receivable, Net of Deferred Income, Total	6,180,536	6,180,536	5,215,417
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	504	504	1,876
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	16	16	33
Commercial real estate lending | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	0	0	0
Total commercial
Summarized details of Loans
Current(a)	15,879,912	15,879,912	13,425,552
Nonaccrual(b)(c)	158,792	158,792	51,282
Loans and Leases Receivable, Net of Deferred Income, Total	16,041,154	16,041,154	13,481,275
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,488	1,488	3,821
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	199	199	278
Total commercial | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	763	763	342
Residential mortgage
Summarized details of Loans
Current(a)	7,816,986	7,816,986	8,069,863
Nonaccrual(b)(c)	62,331	62,331	57,844
Loans and Leases Receivable, Net of Deferred Income, Total	7,885,523	7,885,523	8,136,980
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	5,793	5,793	8,749
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	392	392	525
Residential mortgage | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	22	22	0
Home equity
Summarized details of Loans
Current(a)	745,563	745,563	837,274
Nonaccrual(b)(c)	10,277	10,277	9,104
Loans and Leases Receivable, Net of Deferred Income, Total	761,593	761,593	852,025
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	5,201	5,201	4,483
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	408	408	1,164
Home equity | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	145	145	0
Other consumer
Summarized details of Loans
Current(a)	313,017	313,017	347,007
Nonaccrual(b)(c)	190	190	152
Loans and Leases Receivable, Net of Deferred Income, Total	315,483	315,483	351,159
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	949	949	1,135
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	402	402	949
Other consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	925	925	1,917
Total consumer
Summarized details of Loans
Current(a)	8,875,566	8,875,566	9,254,144
Nonaccrual(b)(c)	72,798	72,798	67,099
Loans and Leases Receivable, Net of Deferred Income, Total	8,962,599	8,962,599	9,340,164
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	11,943	11,943	14,366
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,201	1,201	2,638
Total consumer | 90 Days or More Past Due
Summarized details of Loans
Total Past Due	$ 1,091	$ 1,091	$ 1,917

Loans, Impaired Loans Recorded

Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 110,043
Unpaid Principal Balance	148,020
Related Allowance	16,165
Average Recorded Investment	113,697
Interest Income Recognized	$ 3,628
Net Recorded Investment of the Impaired Loans	63.00%
Bank Mutual
Loan and Lease Receivables, Impaired [Abstract]
Purchased credit-impaired loans	$ 2,000
Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	76,102
Unpaid Principal Balance	95,033
Related Allowance	16,165
Average Recorded Investment	77,235
Interest Income Recognized	3,012
Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	33,941
Unpaid Principal Balance	52,987
Related Allowance	0
Average Recorded Investment	36,462
Interest Income Recognized	616
Commercial and industrial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	62,035
Unpaid Principal Balance	96,784
Related Allowance	12,010
Average Recorded Investment	65,792
Interest Income Recognized	1,895
Commercial and industrial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	47,249
Unpaid Principal Balance	63,346
Related Allowance	12,010
Average Recorded Investment	45,290
Interest Income Recognized	1,832
Commercial and industrial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	14,787
Unpaid Principal Balance	33,438
Related Allowance	0
Average Recorded Investment	20,502
Interest Income Recognized	63
Commercial real estate — owner occupied
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,676
Unpaid Principal Balance	1,682
Related Allowance	19
Average Recorded Investment	1,774
Interest Income Recognized	88
Commercial real estate — owner occupied | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,676
Unpaid Principal Balance	1,682
Related Allowance	19
Average Recorded Investment	1,774
Interest Income Recognized	88
Commercial real estate — owner occupied | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Commercial and business lending
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	63,711
Unpaid Principal Balance	98,466
Related Allowance	12,029
Average Recorded Investment	67,566
Interest Income Recognized	1,982
Commercial and business lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	48,924
Unpaid Principal Balance	65,028
Related Allowance	12,029
Average Recorded Investment	47,064
Interest Income Recognized	1,919
Commercial and business lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	14,787
Unpaid Principal Balance	33,438
Related Allowance	0
Average Recorded Investment	20,502
Interest Income Recognized	63
Commercial real estate — investor
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	4,633
Unpaid Principal Balance	5,808
Related Allowance	15
Average Recorded Investment	4,931
Interest Income Recognized	174
Commercial real estate — investor | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	928
Unpaid Principal Balance	2,104
Related Allowance	15
Average Recorded Investment	950
Interest Income Recognized	15
Commercial real estate — investor | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,705
Unpaid Principal Balance	3,705
Related Allowance	0
Average Recorded Investment	3,980
Interest Income Recognized	159
Real estate construction
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	477
Unpaid Principal Balance	559
Related Allowance	67
Average Recorded Investment	494
Interest Income Recognized	30
Real estate construction | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	477
Unpaid Principal Balance	559
Related Allowance	67
Average Recorded Investment	494
Interest Income Recognized	30
Real estate construction | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Commercial real estate lending
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	5,110
Unpaid Principal Balance	6,367
Related Allowance	82
Average Recorded Investment	5,425
Interest Income Recognized	204
Commercial real estate lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,405
Unpaid Principal Balance	2,663
Related Allowance	82
Average Recorded Investment	1,445
Interest Income Recognized	45
Commercial real estate lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,705
Unpaid Principal Balance	3,705
Related Allowance	0
Average Recorded Investment	3,980
Interest Income Recognized	159
Total commercial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	68,820
Unpaid Principal Balance	104,833
Related Allowance	12,111
Average Recorded Investment	72,991
Interest Income Recognized	2,186
Total commercial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	50,329
Unpaid Principal Balance	67,691
Related Allowance	12,111
Average Recorded Investment	48,509
Interest Income Recognized	1,965
Total commercial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	18,491
Unpaid Principal Balance	37,142
Related Allowance	0
Average Recorded Investment	24,482
Interest Income Recognized	222
Residential mortgage
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	35,554
Unpaid Principal Balance	37,087
Related Allowance	2,740
Average Recorded Investment	34,683
Interest Income Recognized	1,229
Residential mortgage | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	21,450
Unpaid Principal Balance	22,625
Related Allowance	2,740
Average Recorded Investment	23,721
Interest Income Recognized	856
Residential mortgage | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	14,104
Unpaid Principal Balance	14,461
Related Allowance	0
Average Recorded Investment	10,962
Interest Income Recognized	373
Home equity
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	4,422
Unpaid Principal Balance	4,851
Related Allowance	1,190
Average Recorded Investment	4,773
Interest Income Recognized	211
Home equity | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,076
Unpaid Principal Balance	3,468
Related Allowance	1,190
Average Recorded Investment	3,756
Interest Income Recognized	191
Home equity | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,346
Unpaid Principal Balance	1,383
Related Allowance	0
Average Recorded Investment	1,017
Interest Income Recognized	21
Other consumer
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,247
Unpaid Principal Balance	1,249
Related Allowance	125
Average Recorded Investment	1,250
Interest Income Recognized	1
Other consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,247
Unpaid Principal Balance	1,249
Related Allowance	125
Average Recorded Investment	1,250
Interest Income Recognized	1
Other consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Total consumer
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	41,223
Unpaid Principal Balance	43,187
Related Allowance	4,055
Average Recorded Investment	40,706
Interest Income Recognized	1,441
Total consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	25,773
Unpaid Principal Balance	27,342
Related Allowance	4,055
Average Recorded Investment	28,726
Interest Income Recognized	1,047
Total consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	15,450
Unpaid Principal Balance	15,845
Related Allowance	0
Average Recorded Investment	11,979
Interest Income Recognized	$ 394

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	$ 26,891	$ 26,041
Nonaccrual Restructured Loans(a)	23,844	22,494
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	16,002	16,678
Nonaccrual Restructured Loans(a)	7,827	7,376
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,389	1,676
Nonaccrual Restructured Loans(a)	168	0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	635	293
Nonaccrual Restructured Loans(a)	0	0
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	382	298
Nonaccrual Restructured Loans(a)	98	179
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	5,378	3,955
Nonaccrual Restructured Loans(a)	14,535	13,035
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,889	1,896
Nonaccrual Restructured Loans(a)	1,216	1,904
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,218	1,246
Nonaccrual Restructured Loans(a)	$ 0	$ 1

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	57	67
Recorded Investment(a)	$ 8,800	$ 7,500
Unpaid Principal Balance(b)	$ 9,280	$ 7,577
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	3	1
Recorded Investment(a)	$ 1,250	$ 185
Unpaid Principal Balance(b)	$ 1,324	$ 185
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2	0
Recorded Investment(a)	$ 453	$ 0
Unpaid Principal Balance(b)	$ 751	$ 0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment(a)	$ 530	$ 0
Unpaid Principal Balance(b)	$ 530	$ 0
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment(a)	$ 102	$ 0
Unpaid Principal Balance(b)	$ 102	$ 0
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	32	47
Recorded Investment(a)	$ 5,789	$ 6,785
Unpaid Principal Balance(b)	$ 5,870	$ 6,863
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	18	18
Recorded Investment(a)	$ 676	$ 520
Unpaid Principal Balance(b)	$ 702	$ 520
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 9
Unpaid Principal Balance(b)	$ 0	$ 9

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	9	47
Recorded Investment | $	$ 1,244	$ 5,526
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment | $	$ 0	$ 461
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	5	27
Recorded Investment | $	$ 1,036	$ 4,528
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	4	19
Recorded Investment | $	$ 208	$ 538

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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 201,371
Allowance for Loan Losses			201,371		$ 201,371			$ 201,371
Net Charge offs					(55,152)
Balance at end of period					201,371
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			21,907
Allowance for Unfunded Commitments	$ 57,276		57,276		21,907	$ 57,276		21,907
Provision for loan losses			16,500
Balance at end of period	57,276		57,276		21,907
Allowance for credit losses on loans
Net Charge offs					(55,152)
Provision for credit losses	43,009	$ 2,000	157,009	$ 16,000
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			201,371	238,023	238,023
Recoveries					19,161
Net Charge offs					(55,152)
Provision for loan losses					18,500
Balance at end of period	384,711		384,711		201,371
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								16,165
Collectively evaluated								185,205
Total allowance for loan losses	384,711		201,371	238,023	201,371	384,711		201,371
Loans [Abstract]
Individually evaluated								110,043
Collectively evaluated								22,709,845
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								1,552
Loans and Leases Receivable, Net of Deferred Income, Total						25,003,753		22,821,440
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							$ 131,147
Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							354,425
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Allowance for Unfunded Commitments							40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for loan losses			179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Allowance for Unfunded Commitments							18,690
PPP
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total						1,022,217		0
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					(51,441)
Allowance for credit losses on loans
Net Charge offs					(51,441)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			91,133	108,835	108,835
Recoveries					11,875
Net Charge offs					(51,441)
Provision for loan losses					33,738
Balance at end of period					91,133
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								12,010
Collectively evaluated								79,123
Total allowance for loan losses			91,133	108,835	91,133			91,133
Loans [Abstract]
Individually evaluated								62,035
Collectively evaluated								7,292,217
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								342
Loans and Leases Receivable, Net of Deferred Income, Total						7,933,404		7,354,594
Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					2,573
Allowance for credit losses on loans
Net Charge offs					2,573
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			10,284	9,255	9,255
Recoveries					2,795
Net Charge offs					2,573
Provision for loan losses					(1,543)
Balance at end of period					10,284
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								19
Collectively evaluated								10,265
Total allowance for loan losses			10,284	9,255	10,284			10,284
Loans [Abstract]
Individually evaluated								1,676
Collectively evaluated								909,010
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								579
Loans and Leases Receivable, Net of Deferred Income, Total						904,997		911,265
Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					(48,868)
Allowance for credit losses on loans
Net Charge offs					(48,868)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			101,417	118,090	118,090
Recoveries					14,670
Net Charge offs					(48,868)
Provision for loan losses					32,195
Balance at end of period					101,417
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								12,029
Collectively evaluated								89,388
Total allowance for loan losses			101,417	118,090	101,417			101,417
Loans [Abstract]
Individually evaluated								63,711
Collectively evaluated								8,201,227
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								921
Loans and Leases Receivable, Net of Deferred Income, Total						9,860,618		8,265,858
Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					31
Allowance for credit losses on loans
Net Charge offs					31
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			40,514	40,844	40,844
Recoveries					31
Net Charge offs					31
Provision for loan losses					(361)
Balance at end of period					40,514
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								15
Collectively evaluated								40,498
Total allowance for loan losses			40,514	40,844	40,514			40,514
Loans [Abstract]
Individually evaluated								4,633
Collectively evaluated								3,789,755
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								129
Loans and Leases Receivable, Net of Deferred Income, Total						4,320,926		3,794,517
Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					243
Allowance for credit losses on loans
Net Charge offs					243
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			24,915	28,240	28,240
Recoveries					302
Net Charge offs					243
Provision for loan losses					(3,568)
Balance at end of period					24,915
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								67
Collectively evaluated								24,848
Total allowance for loan losses			24,915	28,240	24,915			24,915
Loans [Abstract]
Individually evaluated								477
Collectively evaluated								1,420,416
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								7
Loans and Leases Receivable, Net of Deferred Income, Total						1,859,609		1,420,900
Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					274
Allowance for credit losses on loans
Net Charge offs					274
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			65,429	69,084	69,084
Recoveries					333
Net Charge offs					274
Provision for loan losses					(3,929)
Balance at end of period					65,429
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								82
Collectively evaluated								65,346
Total allowance for loan losses			65,429	69,084	65,429			65,429
Loans [Abstract]
Individually evaluated								5,110
Collectively evaluated								5,210,171
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								136
Loans and Leases Receivable, Net of Deferred Income, Total						6,180,536		5,215,417
Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					(48,594)
Allowance for credit losses on loans
Net Charge offs					(48,594)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			166,846	187,174	187,174
Recoveries					15,003
Net Charge offs					(48,594)
Provision for loan losses					28,266
Balance at end of period					166,846
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								12,111
Collectively evaluated								154,734
Total allowance for loan losses			166,846	187,174	166,846			166,846
Loans [Abstract]
Individually evaluated								68,821
Collectively evaluated								13,411,398
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								1,057
Loans and Leases Receivable, Net of Deferred Income, Total						16,041,154		13,481,275
Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					(2,630)
Allowance for credit losses on loans
Net Charge offs					(2,630)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			16,960	25,595	25,595
Recoveries					692
Net Charge offs					(2,630)
Provision for loan losses					(6,005)
Balance at end of period					16,960
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								2,740
Collectively evaluated								14,220
Total allowance for loan losses			16,960	25,595	16,960			16,960
Loans [Abstract]
Individually evaluated								35,554
Collectively evaluated								8,100,958
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								469
Loans and Leases Receivable, Net of Deferred Income, Total								8,136,980
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					753
Allowance for credit losses on loans
Net Charge offs					753
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			10,926	19,266	19,266
Recoveries					2,599
Net Charge offs					753
Provision for loan losses					(9,093)
Balance at end of period					10,926
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								1,190
Collectively evaluated								9,737
Total allowance for loan losses			10,926	19,266	10,926			10,926
Loans [Abstract]
Individually evaluated								4,422
Collectively evaluated								847,577
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								26
Loans and Leases Receivable, Net of Deferred Income, Total						761,593		852,025
Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					(4,681)
Allowance for credit losses on loans
Net Charge offs					(4,681)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			6,639	5,988	5,988
Recoveries					868
Net Charge offs					(4,681)
Provision for loan losses					5,332
Balance at end of period					6,639
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								125
Collectively evaluated								6,514
Total allowance for loan losses			6,639	5,988	6,639			6,639
Loans [Abstract]
Individually evaluated								1,247
Collectively evaluated								349,912
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								0
Loans and Leases Receivable, Net of Deferred Income, Total								351,159
Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Net Charge offs					(6,558)
Allowance for credit losses on loans
Net Charge offs					(6,558)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period			34,525	50,849	50,849
Recoveries					4,159
Net Charge offs					(6,558)
Provision for loan losses					(9,766)
Balance at end of period					34,525
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated								4,055
Collectively evaluated								30,471
Total allowance for loan losses			34,525	$ 50,849	34,525			34,525
Loans [Abstract]
Individually evaluated								41,223
Collectively evaluated								9,298,447
Financing Receivable Acquired and Accounted under Modification of Impaired Loans								495
Loans and Leases Receivable, Net of Deferred Income, Total						8,962,599		9,340,164
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			201,371
Allowance for Loan Losses	384,711		384,711		201,371	384,711		201,371
Recoveries			8,617
Net Charge offs			(73,121)
Gross up of allowance for PCD loans at acquisition			3,504
Provision for loan losses			137,957
Balance at end of period	384,711		384,711		201,371
Allowance for credit losses on loans
Recoveries			8,617
Net Charge offs			(73,121)
Gross up of allowance for PCD loans at acquisition			3,504
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(81,738)		(74,313)
Net Charge offs			(73,121)
Allowance for Loan Losses [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							313,828
Allowance for Loan Losses [Member] | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							112,457
Allowance for Loan Losses [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			0
Allowance for Loan Losses	968		968		0	968		0
Recoveries			0
Net Charge offs			0
Gross up of allowance for PCD loans at acquisition			0
Provision for loan losses			968
Balance at end of period	968		968		0
Allowance for credit losses on loans
Recoveries			0
Net Charge offs			0
Gross up of allowance for PCD loans at acquisition			0
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			0
Net Charge offs			0
Allowance for Loan Losses [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							0
Allowance for Loan Losses [Member] | PPP | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							0
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			91,133
Allowance for Loan Losses	167,793		167,793		91,133	167,793		91,133
Recoveries			5,210
Net Charge offs			(64,802)
Gross up of allowance for PCD loans at acquisition			293
Provision for loan losses			87,840
Balance at end of period	167,793		167,793		91,133
Allowance for credit losses on loans
Recoveries			5,210
Net Charge offs			(64,802)
Gross up of allowance for PCD loans at acquisition			293
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(70,011)		(63,315)
Net Charge offs			(64,802)
Allowance for Loan Losses [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							144,052
Allowance for Loan Losses [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							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			10,284
Allowance for Loan Losses	11,190		11,190		10,284	11,190		10,284
Recoveries			4
Net Charge offs			(415)
Gross up of allowance for PCD loans at acquisition			890
Provision for loan losses			2,027
Balance at end of period	11,190		11,190		10,284
Allowance for credit losses on loans
Recoveries			4
Net Charge offs			(415)
Gross up of allowance for PCD loans at acquisition			890
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(419)		(222)
Net Charge offs			(415)
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]
Allowance for Loan Losses							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 loan 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]
Allowance for Loan Losses							(1,851)
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			101,417
Allowance for Loan Losses	179,951		179,951		101,417	179,951		101,417
Recoveries			5,213
Net Charge offs			(65,216)
Gross up of allowance for PCD loans at acquisition			1,183
Provision for loan losses			90,836
Balance at end of period	179,951		179,951		101,417
Allowance for credit losses on loans
Recoveries			5,213
Net Charge offs			(65,216)
Gross up of allowance for PCD loans at acquisition			1,183
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(70,430)		(63,537)
Net Charge offs			(65,216)
Allowance for Loan Losses [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							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 loan 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]
Allowance for Loan Losses							51,068
Allowance for Loan Losses [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			40,514
Allowance for Loan Losses	90,201		90,201		40,514	90,201		40,514
Recoveries			643
Net Charge offs			(3,581)
Gross up of allowance for PCD loans at acquisition			753
Provision for loan losses			50,004
Balance at end of period	90,201		90,201		40,514
Allowance for credit losses on loans
Recoveries			643
Net Charge offs			(3,581)
Gross up of allowance for PCD loans at acquisition			753
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(4,224)		0
Net Charge offs			(3,581)
Allowance for Loan Losses [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							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 loan 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]
Allowance for Loan Losses							2,041
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			24,915
Allowance for Loan Losses	37,119		37,119		24,915	37,119		24,915
Recoveries			30
Net Charge offs			(12)
Gross up of allowance for PCD loans at acquisition			435
Provision for loan losses			3,823
Balance at end of period	37,119		37,119		24,915
Allowance for credit losses on loans
Recoveries			30
Net Charge offs			(12)
Gross up of allowance for PCD loans at acquisition			435
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(42)		(60)
Net Charge offs			(12)
Allowance for Loan Losses [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							32,382
Allowance for Loan Losses [Member] | Real estate construction | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							7,467
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			65,429
Allowance for Loan Losses	127,321		127,321		65,429	127,321		65,429
Recoveries			673
Net Charge offs			(3,593)
Gross up of allowance for PCD loans at acquisition			1,188
Provision for loan losses			53,827
Balance at end of period	127,321		127,321		65,429
Allowance for credit losses on loans
Recoveries			673
Net Charge offs			(3,593)
Gross up of allowance for PCD loans at acquisition			1,188
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(4,266)		(60)
Net Charge offs			(3,593)
Allowance for Loan Losses [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							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 loan 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]
Allowance for Loan Losses							9,508
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			166,846
Allowance for Loan Losses	307,272		307,272		166,846	307,272		166,846
Recoveries			5,887
Net Charge offs			(68,810)
Gross up of allowance for PCD loans at acquisition			2,371
Provision for loan losses			144,662
Balance at end of period	307,272		307,272		166,846
Allowance for credit losses on loans
Recoveries			5,887
Net Charge offs			(68,810)
Gross up of allowance for PCD loans at acquisition			2,371
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(74,696)		(63,597)
Net Charge offs			(68,810)
Allowance for Loan Losses [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							227,422
Allowance for Loan Losses [Member] | Total commercial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							60,576
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			16,960
Allowance for Loan Losses	43,640		43,640		16,960	43,640		16,960
Recoveries			409
Net Charge offs			(1,206)
Gross up of allowance for PCD loans at acquisition			651
Provision for loan losses			(6,382)
Balance at end of period	43,640		43,640		16,960
Allowance for credit losses on loans
Recoveries			409
Net Charge offs			(1,206)
Gross up of allowance for PCD loans at acquisition			651
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(1,615)		(3,322)
Net Charge offs			(1,206)
Allowance for Loan Losses [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							50,175
Allowance for Loan Losses [Member] | Residential mortgage | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							33,215
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			10,926
Allowance for Loan Losses	19,361		19,361		10,926	19,361		10,926
Recoveries			1,476
Net Charge offs			(76)
Gross up of allowance for PCD loans at acquisition			422
Provision for loan losses			(3,935)
Balance at end of period	19,361		19,361		10,926
Allowance for credit losses on loans
Recoveries			1,476
Net Charge offs			(76)
Gross up of allowance for PCD loans at acquisition			422
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(1,551)		(1,846)
Net Charge offs			(76)
Allowance for Loan Losses [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							22,575
Allowance for Loan Losses [Member] | Home equity | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							11,649
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			6,639
Allowance for Loan Losses	14,438		14,438		6,639	14,438		6,639
Recoveries			845
Net Charge offs			(3,030)
Gross up of allowance for PCD loans at acquisition			61
Provision for loan losses			3,612
Balance at end of period	14,438		14,438		6,639
Allowance for credit losses on loans
Recoveries			845
Net Charge offs			(3,030)
Gross up of allowance for PCD loans at acquisition			61
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(3,875)		(5,548)
Net Charge offs			(3,030)
Allowance for Loan Losses [Member] | Other consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							13,655
Allowance for Loan Losses [Member] | Other consumer | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan losses			140
Allowance for Loan Losses [Member] | Other consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							7,016
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			34,525
Allowance for Loan Losses	77,440		77,440		34,525	77,440		34,525
Recoveries			2,730
Net Charge offs			(4,311)
Gross up of allowance for PCD loans at acquisition			1,134
Provision for loan losses			(6,705)
Balance at end of period	77,440		77,440		34,525
Allowance for credit losses on loans
Recoveries			2,730
Net Charge offs			(4,311)
Gross up of allowance for PCD loans at acquisition			1,134
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(7,042)		(10,716)
Net Charge offs			(4,311)
Allowance for Loan Losses [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							86,405
Allowance for Loan Losses [Member] | Total consumer | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for loan 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]
Allowance for Loan Losses							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			21,907
Allowance for Unfunded Commitments	57,276		57,276		21,907	57,276		21,907
Provision for loan losses			16,500
Balance at end of period	57,276		57,276		21,907
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							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			12,276
Allowance for Unfunded Commitments	21,190		21,190		12,276	21,190		12,276
Provision for loan losses			12,851
Balance at end of period	21,190		21,190		12,276
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							(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			127
Allowance for Unfunded Commitments	564		564		127	564		127
Provision for loan losses			434
Balance at end of period	564		564		127
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							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			12,403
Allowance for Unfunded Commitments	21,754		21,754		12,403	21,754		12,403
Provision for loan losses			13,285
Balance at end of period	21,754		21,754		12,403
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							(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			530
Allowance for Unfunded Commitments	719		719		530	719		530
Provision for loan losses			(58)
Balance at end of period	719		719		530
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							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			7,532
Allowance for Unfunded Commitments	28,626		28,626		7,532	28,626		7,532
Provision for loan losses			2,703
Balance at end of period	28,626		28,626		7,532
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							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			8,062
Allowance for Unfunded Commitments	29,345		29,345		8,062	29,345		8,062
Provision for loan losses			2,644
Balance at end of period	29,345		29,345		8,062
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							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			20,465
Allowance for Unfunded Commitments	51,100		51,100		20,465	51,100		20,465
Provision for loan losses			15,929
Balance at end of period	51,100		51,100		20,465
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							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			1,038
Allowance for Unfunded Commitments	3,588		3,588		1,038	3,588		1,038
Provision for loan losses			(106)
Balance at end of period	3,588		3,588		1,038
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							2,591
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period			405
Allowance for Unfunded Commitments	2,585		2,585		405	2,585		405
Provision for loan losses			676
Balance at end of period	2,585		2,585		405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Allowance for Unfunded Commitments							1,909
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for loan losses			0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Allowance for Unfunded Commitments							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			1,443
Allowance for Unfunded Commitments	6,176		6,176		1,443	6,176		1,443
Provision for loan losses			571
Balance at end of period	6,176		6,176		1,443
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]
Allowance for Unfunded Commitments							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 loan 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]
Allowance for Unfunded Commitments							4,095
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			8,617
Net Charge offs			(73,121)
Gross up of allowance for PCD loans at acquisition			3,504
Allowance for credit losses on loans
Balance at beginning of period			223,278
Allowance for Credit Losses on Loans	441,988		441,988		223,278	$ 441,988		223,278
Recoveries			8,617
Net Charge offs			(73,121)
Gross up of allowance for PCD loans at acquisition			3,504
Provision for credit losses			154,457
Balance at end of period	441,988		441,988		223,278
Percent of Loans						1.77%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(81,738)
Net Charge offs			(73,121)
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
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Loan Losses							131,000
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
Net Charge offs			0
Gross up of allowance for PCD loans at acquisition			0
Allowance for credit losses on loans
Balance at beginning of period			0
Allowance for Credit Losses on Loans	968		968		0	$ 968		0
Recoveries			0
Net Charge offs			0
Gross up of allowance for PCD loans at acquisition			0
Provision for credit losses			968
Balance at end of period	968		968		0
Percent of Loans						0.09%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			0
Net Charge offs			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			5,210
Net Charge offs			(64,802)
Gross up of allowance for PCD loans at acquisition			293
Allowance for credit losses on loans
Balance at beginning of period			103,409
Allowance for Credit Losses on Loans	188,983		188,983		103,409	$ 188,983		103,409
Recoveries			5,210
Net Charge offs			(64,802)
Gross up of allowance for PCD loans at acquisition			293
Provision for credit losses			100,691
Balance at end of period	188,983		188,983		103,409
Percent of Loans						2.38%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(70,011)
Net Charge offs			(64,802)
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			4
Net Charge offs			(415)
Gross up of allowance for PCD loans at acquisition			890
Allowance for credit losses on loans
Balance at beginning of period			10,411
Allowance for Credit Losses on Loans	11,755		11,755		10,411	$ 11,755		10,411
Recoveries			4
Net Charge offs			(415)
Gross up of allowance for PCD loans at acquisition			890
Provision for credit losses			2,461
Balance at end of period	11,755		11,755		10,411
Percent of Loans						1.30%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(419)
Net Charge offs			(415)
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			5,213
Net Charge offs			(65,216)
Gross up of allowance for PCD loans at acquisition			1,183
Allowance for credit losses on loans
Balance at beginning of period			113,820
Allowance for Credit Losses on Loans	201,706		201,706		113,820	$ 201,706		113,820
Recoveries			5,213
Net Charge offs			(65,216)
Gross up of allowance for PCD loans at acquisition			1,183
Provision for credit losses			104,120
Balance at end of period	201,706		201,706		113,820
Percent of Loans						2.05%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(70,430)
Net Charge offs			(65,216)
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			643
Net Charge offs			(3,581)
Gross up of allowance for PCD loans at acquisition			753
Allowance for credit losses on loans
Balance at beginning of period			41,044
Allowance for Credit Losses on Loans	90,921		90,921		41,044	$ 90,921		41,044
Recoveries			643
Net Charge offs			(3,581)
Gross up of allowance for PCD loans at acquisition			753
Provision for credit losses			49,945
Balance at end of period	90,921		90,921		41,044
Percent of Loans						2.10%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(4,224)
Net Charge offs			(3,581)
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			30
Net Charge offs			(12)
Gross up of allowance for PCD loans at acquisition			435
Allowance for credit losses on loans
Balance at beginning of period			32,447
Allowance for Credit Losses on Loans	65,745		65,745		32,447	$ 65,745		32,447
Recoveries			30
Net Charge offs			(12)
Gross up of allowance for PCD loans at acquisition			435
Provision for credit losses			6,525
Balance at end of period	65,745		65,745		32,447
Percent of Loans						3.54%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(42)
Net Charge offs			(12)
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			673
Net Charge offs			(3,593)
Gross up of allowance for PCD loans at acquisition			1,188
Allowance for credit losses on loans
Balance at beginning of period			73,490
Allowance for Credit Losses on Loans	156,667		156,667		73,490	$ 156,667		73,490
Recoveries			673
Net Charge offs			(3,593)
Gross up of allowance for PCD loans at acquisition			1,188
Provision for credit losses			56,471
Balance at end of period	156,667		156,667		73,490
Percent of Loans						2.53%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(4,266)
Net Charge offs			(3,593)
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			5,887
Net Charge offs			(68,810)
Gross up of allowance for PCD loans at acquisition			2,371
Allowance for credit losses on loans
Balance at beginning of period			187,311
Allowance for Credit Losses on Loans	358,372		358,372		187,311	$ 358,372		187,311
Recoveries			5,887
Net Charge offs			(68,810)
Gross up of allowance for PCD loans at acquisition			2,371
Provision for credit losses			160,591
Balance at end of period	358,372		358,372		187,311
Percent of Loans						2.23%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(74,696)
Net Charge offs			(68,810)
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			409
Net Charge offs			(1,206)
Gross up of allowance for PCD loans at acquisition			651
Allowance for credit losses on loans
Balance at beginning of period			16,960
Allowance for Credit Losses on Loans	43,643		43,643		16,960	$ 43,643		16,960
Recoveries			409
Net Charge offs			(1,206)
Gross up of allowance for PCD loans at acquisition			651
Provision for credit losses			(6,380)
Balance at end of period	43,643		43,643		16,960
Percent of Loans						0.55%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(1,615)
Net Charge offs			(1,206)
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			1,476
Net Charge offs			(76)
Gross up of allowance for PCD loans at acquisition			422
Allowance for credit losses on loans
Balance at beginning of period			11,964
Allowance for Credit Losses on Loans	22,949		22,949		11,964	$ 22,949		11,964
Recoveries			1,476
Net Charge offs			(76)
Gross up of allowance for PCD loans at acquisition			422
Provision for credit losses			(4,041)
Balance at end of period	22,949		22,949		11,964
Percent of Loans						3.01%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(1,551)
Net Charge offs			(76)
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
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			845
Net Charge offs			(3,030)
Gross up of allowance for PCD loans at acquisition			61
Allowance for credit losses on loans
Balance at beginning of period			7,044
Allowance for Credit Losses on Loans	17,023		17,023		7,044	$ 17,023		7,044
Recoveries			845
Net Charge offs			(3,030)
Gross up of allowance for PCD loans at acquisition			61
Provision for credit losses			4,287
Balance at end of period	17,023		17,023		7,044
Percent of Loans						5.40%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(3,875)
Net Charge offs			(3,030)
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | 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 | 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 | 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] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries			2,730
Net Charge offs			(4,311)
Gross up of allowance for PCD loans at acquisition			1,134
Allowance for credit losses on loans
Balance at beginning of period			35,968
Allowance for Credit Losses on Loans	83,616		83,616		35,968	$ 83,616		$ 35,968
Recoveries			2,730
Net Charge offs			(4,311)
Gross up of allowance for PCD loans at acquisition			1,134
Provision for credit losses			(6,134)
Balance at end of period	$ 83,616		83,616		$ 35,968
Percent of Loans						0.93%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs			(7,042)
Net Charge offs			(4,311)
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, 2020	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
Loans Information [Line Items]
Interest Receivable	$ 91,612	$ 91,612			$ 91,196
Financing Receivable, Nonaccrual, Interest Income	1 million	2 million
Recorded Investment, loans modified in troubled debt restructuring		$ 8,800	$ 7,500
Restructured Loans Subsequently Accruing	$ 3,000	3,000
Ytd Restructured Loans Still On Nonaccrual	6,000	6,000
Loans and Finance Receivables [Member]
Loans Information [Line Items]
Interest Receivable	67,000	67,000			$ 63,000
Possible Liquidity Issues [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 73,000	$ 73,000		$ 114,000

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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Summary of core deposit intangibles and other intangibles
Other intangible amortization	$ 2,253	$ 2,686	$ 7,939	$ 7,237
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year					$ 80,730	$ 58,100
Additions during the period			7,379		22,630
Accumulated amortization	(19,003)		(19,003)		(12,456)
Net book value	69,107		69,107		68,274
Other intangible amortization			6,547		7,130
Other Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year					38,970	$ 44,887
Additions during the period			200		0
Reductions due to sale			(19,000)
Accumulated amortization	(20,335)		(20,335)		(24,643)
Net book value	$ 1,400		1,400		20,027
Other intangible amortization			1,393		2,818
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Summary of core deposit intangibles and other intangibles
Reductions due to sale			$ (17,435)		$ (217)

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Mortgage servicing rights
Mortgage servicing rights at beginning of period		$ 67,607	$ 68,433
Additions from acquisition		1,357	0
Additions		11,495	11,606
Amortization		(16,416)	(12,432)
Mortgage servicing rights at end of period	$ 64,043	64,043	67,607
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period		(302)	(239)
(Additions) recoveries, net	(18,000)	(18,481)	(63)
Valuation allowance at end of period	(18,782)	(18,782)	(302)
Mortgage servicing rights, net	45,261	45,261	67,306
Fair value of mortgage servicing rights	45,303	45,303	72,532
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 8,218,839	$ 8,218,839	$ 8,488,969
Mortgage servicing rights, net to servicing portfolio	0.55%	0.55%	0.79%
Mortgage servicing rights expense(a)	$ 34,897	$ 34,897	$ 12,494

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Core Deposit Intangibles
Estimated future amortization expense
Three Months Ending December 31, 2020	$ 2,203
Year ending December 31, 2021	8,811
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
Beyond 2025	22,849
Net book value	69,107	$ 68,274
Other Intangibles
Estimated future amortization expense
Three Months Ending December 31, 2020	50
Year ending December 31, 2021	200
Year ending December 31, 2022	200
Year ending December 31, 2023	200
Year ending December 31, 2024	200
Year ending December 31, 2025	200
Beyond 2025	350
Net book value	1,400	$ 20,027
Mortgage Servicing Rights
Estimated future amortization expense
Three Months Ending December 31, 2020	4,245
Year ending December 31, 2021	15,333
Year ending December 31, 2022	10,935
Year ending December 31, 2023	8,030
Year ending December 31, 2024	6,095
Year ending December 31, 2025	4,764
Beyond 2025	14,640
Net book value	$ 64,043

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Details Textuals) - USD ($) $ in Thousands	Jun. 30, 2020	Feb. 14, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)			$ 18,000		$ 18,481	$ 63
Goodwill [Line Items]
Goodwill			$ 1,107,902		1,107,902	1,176,230
Goodwill, Acquired During Period				$ 13,000
Other Intangibles
Goodwill [Line Items]
Decrease of other intangible assets					19,000
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Goodwill [Line Items]
Decrease of other intangible assets					$ 17,435	$ 217
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ABRC
Goodwill [Line Items]
Decrease of other intangible assets	$ (17,000)
First Staunton Bancshares [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	$ 82,000	$ 13,414		$ 15,000

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, 2020	Dec. 31, 2019
Short-term Funding [Abstract]
Federal funds purchased	$ 7,575	$ 362,000
Securities sold under agreements to repurchase	147,754	71,097
Federal funds purchased and securities sold under agreements to repurchase	155,329	433,097
Commercial paper	50,987	32,016
Total short-term funding	206,316	465,113
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
PPPLF	1,022,217	0
Finance lease liability	1,165	2,209
Capitalized costs	(1,964)	(2,866)
Total long-term funding	1,571,418	549,343
Total short and long-term funding, excluding FHLB advances	1,777,735	1,014,456
FHLB Advances
Short-term FHLB advances	0	520,000
Long-term FHLB advances	1,706,763	2,660,967
FHLB advances	1,706,763	3,180,967
Total short and long-term funding	3,484,498	4,195,422
Bank senior notes, at par, due 2021
Long-Term Funding
Senior notes	$ 300,000	$ 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, 2020	Dec. 31, 2019
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 147,754	$ 71,097
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	147,754	71,097
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	147,754	71,097
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	147,754	71,097
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	Aug. 13, 2018	Nov. 30, 2014	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Long-Term Funding
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed			$ 246,000			$ 246,000
Fixed Interest Rates, Finance Leases			1.00%
FHLB advances			$ 1,706,763			1,706,763		$ 3,180,967
Increase Decrease in FHLB Advances			$ (1,500,000)			$ (1,500,000)
Decrease in FHLB Advances, Percent			46.00%			46.00%
Prepayment of FHLB advances			$ 950,000
Loss on prepayments of FHLB advances			$ 44,650		$ 0	$ 44,650	$ 0
Net increase (decrease) in short-term FHLB advances						$ (520,000)	$ (685,000)
Minimum
Long-Term Funding
PPPLF Original Terms				2 years
Maximum
Long-Term Funding
PPPLF Original Terms				5 years
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, Interest Rate, Stated Percentage	3.50%
PPP
Long-Term Funding
Debt Instrument, Interest Rate, Stated Percentage			0.35%			0.35%
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, 2020	Dec. 31, 2019
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Forward commitment fair value	$ 108
Asset
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other assets), fair value	264,445	$ 104,305
Less: Legally enforceable master netting agreements	2,524	10,410
Less: Cash collateral pledged/received	24,837	1,408
Derivative Asset	237,084	92,487
Liability
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other liabilities), fair value	57,999	37,455
Less: Legally enforceable master netting agreements	2,524	10,410
Less: Cash collateral pledged/received	28,363	11,365
Derivatives (trading liabilities)	27,112	15,680
Not designated as hedging instruments | Asset | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	3,731,752	3,029,877
Derivatives (trading and other assets), fair value	225,912	77,024
Not designated as hedging instruments | Asset | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	431,862	272,636
Derivatives (trading and other assets), fair value	4,710	4,226
Not designated as hedging instruments | Asset | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	132,055	255,089
Derivatives (trading and other assets), fair value	25,935	20,528
Not designated as hedging instruments | Asset | Mortgage banking(a)(b)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	171,871	255,291
Derivatives (trading and other assets), fair value	7,888	2,527
Not designated as hedging instruments | Liability | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	3,731,752	3,029,877
Derivatives (trading and other liabilities), fair value	28,960	13,073
Not designated as hedging instruments | Liability | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	422,645	264,653
Derivatives (trading and other liabilities), fair value	4,563	4,048
Not designated as hedging instruments | Liability | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	127,597	255,165
Derivatives (trading and other liabilities), fair value	24,476	19,624
Not designated as hedging instruments | Liability | Mortgage banking(a)(b)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	264,000	263,000
Derivatives (trading and other liabilities), fair value	$ 0	$ 710

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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (481)	$ (59)	$ (1,345)	$ 160
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	(262)	0
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	(481)	452	(1,345)	6,674
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	(262)	0
Designated as Hedging Instrument | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	(511)	0	(6,514)
Designated as Hedging Instrument | 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	$ 0

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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Capital markets, net | Interest rate-related instruments — customer and mirror, net
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 507	$ (619)	$ (2,648)	$ (2,309)
Capital markets, net | Foreign currency exchange forwards
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	49	72	(31)	284
Capital markets, net | Commodity contracts
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(86)	208	555	(2,037)
Mortgage banking, net | Interest rate lock commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(4,948)	(2,851)	5,361	(191)
Mortgage banking, net | Forward commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 1,293	$ 1,313	$ 710	$ 1,482

Derivative and Hedging Activi_6

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 75	$ 57
Derivative collateral right to reclaim cash	30	14
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	674
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 4

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts Recognized	$ 27,408	$ 11,864
Derivative Assets Offset	(2,524)	(10,410)
Derivative Asset, Collateral, Obligation to Return Cash, Offset	(24,837)	(1,408)
Net Amounts Presented on the Consolidated Balance Sheets	47	45
Investment Securities Received	0	0
Net amount	47	45
Derivative liabilities
Gross Amounts Recognized	31,164	22,189
Derivative Liability, Fair Value, Gross Asset	(2,524)	(10,410)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(28,363)	(11,365)
Net Amounts Presented on the Consolidated Balance Sheets	277	413
Investment Securities Pledged	0	0
Net amount	$ 277	$ 413

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, 2020	Dec. 31, 2019
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 0	$ 0
Summary of lending-related and other commitments
Unfunded Commitments	57,276	21,907
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	9,582,235	9,024,412
Commercial letters of credit(a)
Summary of lending-related and other commitments
Lending related commitments	6,977	7,081
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	252,292	277,969
Standby letters of credit, fair value	$ 2,000	$ 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, 2020	Dec. 31, 2019	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 21,907
Allowance for Unfunded Commitments	57,276	$ 21,907
Provision for loan losses	16,500
Balance at end of period	57,276	21,907
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	21,907
Balance at end of period	57,276	21,907
Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Allowance for Unfunded Commitments			$ 40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for loan losses	179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Allowance for Unfunded Commitments			$ 18,690
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	21,907	24,336
Balance at beginning of period, adjusted		24,336
Provision for unfunded commitments	$ 17,000	(2,500)
Balance at end of period		21,907
Amount Recorded at Acquisition [Member] | SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Amount recorded at acquisition		$ 70

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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jan. 01, 2020	Dec. 31, 2018
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Allowance for Unfunded Commitments	$ 57,276,000		$ 57,276,000		$ 21,907,000
Expense Related to Qualified Affordable Housing Projects	6,000,000	$ 4,000,000	18,000,000	$ 14,000,000
Remaining Investment in Qualified Affordable Housing Projects	274,000,000		274,000,000		234,000,000
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount	147,000,000		147,000,000		123,000,000
Qualified Affordable Housing Investments, Impairment Loss			0		0
Loans Repurchased Under Make Whole Requests	7,000,000		$ 7,000,000		$ 2,000,000
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid			no		negligible
Loans Sold To Outside Investors Original Amount	14,000,000,000		$ 14,000,000,000
Loans Sold To Outside Investors Remaining Outstanding Amount	7,200,000,000		7,200,000,000
Unfunded Commitments	57,276,000		57,276,000		$ 21,907,000
Mortgage Repurchase Reserve	2,000,000		2,000,000		795,000
Residential Mortgage Loans Sold With Recourse Risk	47,000,000		47,000,000		39,000,000
Residential Mortgage Loans Sold With Credit Recourse Risk	36,000,000		36,000,000		45,000,000
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Provision for unfunded commitments			17,000,000		(2,500,000)
Unfunded Commitments					21,907,000		$ 24,336,000
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	285,000,000		285,000,000		248,000,000
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	$ 28,000,000		$ 28,000,000		$ 26,000,000
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Allowance for Unfunded Commitments						$ 18,690,000

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	$ 3,258,360	$ 3,262,586
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,650	0
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,231,711	3,262,586
Residential Held-for-sale, Fair Value Disclosure	130,139	136,280
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	7,888	2,527
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	710
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	1,646	1,646
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Total investment securities available for sale
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,650	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | GNMA
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	407,313	985,139
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FFELP
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	325,843	263,693
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	2,997	3,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities available for sale
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,231,711	3,262,586
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential loans held for sale
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	130,139	136,280
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror, net
Assets, Fair Value Disclosure [Abstract]
Trading assets	225,912	77,024
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	28,960	13,073
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Assets, Fair Value Disclosure [Abstract]
Trading assets	4,710	4,226
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	4,563	4,048
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading assets	25,935	20,528
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	24,476	19,624
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Mortgage banking(a)(b)
Assets, Fair Value Disclosure [Abstract]
Trading assets	7,888	2,527
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	710
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	1,276,463	132,660
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	21,877	21,728
GNMA | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	688,378	1,310,207
US Treasury Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,650
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,650	0
Obligations of state and political subdivisions (municipal securities)
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	474,695	546,160
Obligations of state and political subdivisions (municipal securities) | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	474,695	546,160
Agency Securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	25,033
Agency Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	25,033	0
SBA
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	9,111
SBA | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	$ 9,111	$ 0

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, 2020	Dec. 31, 2019
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	$ 2,527	$ 2,208
New production	59,550	24,164
Closed loans / settlements	(60,000)	(29,375)
Other	5,703	5,530
Mortgage derivative gain (loss)	5,253	319
Ending Balance	7,780	2,527
Forward commitments to sell residential mortgage loans
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	710	2,072
New production	(1,790)	(2,367)
Closed loans / settlements	(14,169)	(5,968)
Other	15,140	6,973
Mortgage derivative gain (loss)	(819)	(1,362)
Ending Balance	(108)	710
Total derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	1,817	140
New production	61,340	26,531
Closed loans / settlements	(45,831)	(23,407)
Other	(9,437)	(1,443)
Mortgage derivative gain (loss)	6,072	1,681
Ending Balance	$ 7,888	$ 1,817

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2019			$ 13,000
Carrying value changes	$ 0	$ 0	0	$ 13,444
Carrying value as of September 30, 2020	13,000		13,000
Fair Value, Inputs, Level 3
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2019			13,444
Carrying value changes			0
Carrying value as of September 30, 2020	13,444		13,444
Cumulative upward carrying value changes between January 1, 2018 and September 30, 2020	13,444		13,444
Cumulative downward carrying value changes/impairment between January 1, 2018 and September 30, 2020	$ 0		$ 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, 2020	Sep. 30, 2019	Dec. 31, 2019
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 45,303		$ 72,532
Mortgage banking, net	18,481	$ 177
Equity securities	13,000		13,000
Investment securities gains (losses), net	15,090		15,090
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity securities	13,444		13,444
Investment securities gains (losses), net	13,444		13,444
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
OREO(b)	10,953		3,565
Other noninterest expense	(7,339)		(1,860)
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)	117,451		45,792
Provision for credit losses	(96,856)		(66,172)
Mortgage servicing rights	45,303		72,532
Mortgage banking, net	$ (18,481)		(63)
Equity securities			13,444
Investment securities gains (losses), net			$ 13,444

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, 2020
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	14.00%
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	14.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	46.00%
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	20.00%
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	0.00%
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	42.00%
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	37.00%

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Financial assets
Cash and due from banks	$ 401,151	$ 373,380
Interest-bearing deposits in other financial institutions	712,416	207,624
Federal funds sold and securities purchased under agreements to resell	95	7,740
Investment securities held to maturity, net	1,990,940	2,205,083
Investment securities held to maturity, fair value	2,124,452	2,276,465
Investment securities available for sale	3,258,360	3,262,586
Investment securities available for sale, fair value			$ 692,000
Equity securities with readily determinable fair values, Fair Value	2,000	2,000
Equity Securities without Readily Determinable Fair Value, Amount	13,000	13,000
Investment securities gains (losses), net	15,090	15,090
FHLB and Federal Reserve Bank stocks	168,280	227,347
Loans, net	24,619,041	22,620,068
Financial liabilities
Short-term funding	206,316	465,113
Other long-term funding	1,571,418	549,343
PPPLF	1,022,217	0
FHLB advances	1,706,763	3,180,967
Letters of Credit Outstanding, Amount	252,000	278,000
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	401,151	373,380
Cash and due from banks, Fair Value	401,151	373,380
Interest-bearing deposits in other financial institutions	712,416	207,624
Interest-bearing deposits in other financial institutions, fair value	712,416	207,624
Federal funds sold and securities purchased under agreements to resell	95	7,740
Federal funds sold and securities purchased under agreements to resell, fair value	95	7,740
Investment securities held to maturity, net	999	999
Investment securities held to maturity, fair value	1,030	1,018
Investment securities available for sale	26,650	0
Investment securities available for sale, fair value	26,650	0
Equity securities with readily determinable fair value, Carrying Amount	1,646	1,646
Equity securities with readily determinable fair values, Fair Value	1,646	1,646
Fair Value, Inputs, Level 2
Financial assets
Investment securities held to maturity, net	1,989,870	2,204,084
Investment securities held to maturity, fair value	2,123,351	2,275,447
Investment securities available for sale	3,231,711	3,262,586
Investment securities available for sale, fair value	3,231,711	3,262,586
FHLB and Federal Reserve Bank stocks	168,280	227,347
FHLB and Federal Reserve Bank stocks, fair value	168,280	227,347
Residential Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	130,139	136,280
Residential Held-for-sale, Fair Value Disclosure	130,139	136,280
Commercial loans held for sale	19,360	15,000
Commercial Loans Held-for-sale, Fair Value Disclosure	19,360	15,000
Bank and Corporate Owned Life Insurance	679,257	671,948
Bank owned life insurance, fair value	679,257	671,948
Financial liabilities
Brokered CDs and other time deposits	2,026,852	2,622,803
Brokered CDs and other time deposits, fair value	2,039,995	2,622,803
Short-term funding	206,316	465,113
Short-term funding, fair value	206,316	465,113
Other long-term funding	549,201	549,343
Long-term funding, fair value	589,717	572,873
PPPLF	1,022,217	0
Paycheck Protection Program Loan Funding Fair Value	1,022,399	0
FHLB advances	1,706,763	3,180,967
Advances, Fair Value Disclosure	1,851,567	3,207,793
Standby letters of credit	2,489	2,710
Standby letters of credit, fair value	2,489	2,710
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	256,557	101,778
Derivatives (trading and other assets), fair value	256,557	101,778
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	57,999	36,745
Derivatives (trading and other liabilities), fair value	57,999	36,745
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	13,444	13,444
Investment securities gains (losses), net	13,444	13,444
Loans, net	24,619,041	22,620,068
Loans, net, fair value	24,532,881	22,399,621
Derivative Asset	7,888	2,527
Derivatives (trading and other assets), fair value	7,888	2,527
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	24,685,695	21,156,261
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	24,685,695	21,156,261
Derivatives (trading liabilities)	0	710
Derivatives (trading and other liabilities), fair value	$ 0	$ 710

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals)	9 Months Ended
	Sep. 30, 2020
Fair Value Measurements (Textuals) [Abstract]
Fair Value Inputs Closing Ratio	88.00%

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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
RAP
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,853	$ 1,598	$ 6,183	$ 5,448
Interest cost	2,124	2,489	6,139	7,314
Expected return on plan assets	(6,386)	(6,099)	(19,196)	(18,249)
Amortization of prior service cost	(18)	(18)	(55)	(55)
Amortization of actuarial loss (gain)	1,313	230	2,923	360
Total net periodic pension cost	(1,114)	(1,800)	(4,006)	(5,183)
Postretirement Plan
Net period benefit cost for the pension and postretirement plans
Interest cost	20	26	59	78
Amortization of prior service cost	(19)	(19)	(56)	(56)
Amortization of actuarial loss (gain)	0	(1)	0	(3)
Total net periodic pension cost	$ 1	$ 6	$ 2	$ 19

Retirement Plans (Details Textu

Retirement Plans (Details Textuals) (Details) - USD ($) $ in Millions	Feb. 14, 2020	Jun. 14, 2019	Sep. 30, 2020	Sep. 30, 2019
Huntington National Bank
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effective Date of Acquisition		Jun. 14, 2019
First Staunton Bancshares [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effective Date of Acquisition	Feb. 14, 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 retirement account plan, the 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, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Income Statement Data Abstract
Net interest income	$ 182,150			$ 206,365			$ 574,964	$ 635,532
Net intersegment interest income (expense)	0			0			0	0
Segment net interest income	182,150			206,365			574,964	635,532
Noninterest income	75,545			100,850			428,342	287,890
Total revenue	257,695			307,216			1,003,305	923,422
Credit provision	43,009			2,000			157,009	16,000
Noninterest expense	227,587			200,930			603,184	590,380
Income (loss) before income taxes	(12,900)			104,286			243,112	317,042
Income tax expense (benefit)	(58,114)			20,947			3,342	62,356
Net income	45,214	$ 148,718	$ 45,838	83,339	$ 84,661	$ 86,686	239,769	254,686
Segment Balance Sheet Data
Allocated goodwill							1,107,902	1,176,230
Loss on prepayments of FHLB advances	44,650			0			44,650	0
Tax Benefit from Tax Planning Strategies	49,000						63,000
Risk Management and Shared Services
Segment Balance Sheet Data
Loss on prepayments of FHLB advances							45,000
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	92,033			111,060			298,611	339,222
Net intersegment interest income (expense)	6,937			(12,041)			3,123	(40,863)
Segment net interest income	98,970			99,020			301,734	298,359
Noninterest income	37,405			33,671			111,254	101,135
Total revenue	136,376			132,691			412,987	399,495
Credit provision	15,572			12,248			41,456	37,417
Noninterest expense	52,144			57,946			159,471	174,570
Income (loss) before income taxes	68,660			62,497			212,060	187,508
Income tax expense (benefit)	12,600			11,249			39,461	35,472
Net income	56,060			51,248			172,599	152,036
Segment Balance Sheet Data
Allocated goodwill							530,144	530,144
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	73,644			73,777			221,691	230,476
Net intersegment interest income (expense)	9,231			25,437			42,213	68,930
Segment net interest income	82,875			99,214			263,904	299,406
Noninterest income	32,958			59,934			140,442	171,283
Total revenue	115,833			159,148			404,345	470,688
Credit provision	5,758			4,631			16,296	13,942
Noninterest expense	102,100			118,241			335,591	345,611
Income (loss) before income taxes	7,975			36,277			52,458	111,135
Income tax expense (benefit)	1,675			7,618			11,016	23,338
Net income	6,300			28,658			41,442	87,797
Segment Balance Sheet Data
Allocated goodwill							577,758	646,086
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	16,472			21,528			54,662	65,834
Net intersegment interest income (expense)	(16,167)			(13,396)			(45,336)	(28,067)
Segment net interest income	305			8,131			9,326	37,767
Noninterest income	5,182			7,245			176,646	15,472
Total revenue	5,487			15,376			185,973	53,239
Credit provision	21,679			(14,879)			99,257	(35,359)
Noninterest expense	73,343			24,743			108,122	70,198
Income (loss) before income taxes	(89,535)			5,512			(21,407)	18,400
Income tax expense (benefit)	(72,389)			2,080			(47,135)	3,546
Net income	(17,146)			3,432			25,728	14,854
Segment Balance Sheet Data
Allocated goodwill							0	0
Business Combination, Acquisition Related Costs	$ 218			$ 1,629			$ 2,457	$ 5,995

Segment Reporting (Details Text

Segment Reporting (Details Textuals) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)	Mar. 31, 2020	Sep. 30, 2020USD ($)segment
Segment Reporting [Abstract]
Number of Reportable Segments | segment			3
Description of Effect on Previously Reported Segment Information for Change in Composition of Reportable Segments		During the first quarter of 2020, the Corporation reassigned goodwill of approximately $4 million to the Corporate and Commercial Specialty segment from the Community, Consumer and Business segment as a result of a reorganization of the investment and fiduciary businesses. The goodwill reassigned was attributable to the Corporation's acquisition of Whitnell & Co. in 2017. Also effective in the first quarter of 2020, the marketing business unit, formerly part of the Risk Management and Shared Services segment, was reorganized under the Community, Consumer and Business segment.
Tax Benefit from Tax Planning Strategies | $	$ 49		$ 63

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (33,183)				$ (33,183)
Investment securities losses (gains), net	$ 0			$ (225)			(90)	$ (13,861)
Personnel expense	(108,567)			(123,170)			(334,117)	(366,449)
Interest income	(1,296)			8			(2,628)	(279)
Total other comprehensive income (loss)	5,916	$ 15,054	16,209	22,111	$ 44,311	$ 21,597	37,178	88,020
Ending Balance	3,995						3,995
Investment Securities Available For Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	34,101		3,989	(9,773)		(75,643)	3,989	(75,643)
Other comprehensive income (loss) before reclassifications	5,840			33,173			53,900	123,139
Investment securities losses (gains), net	(7)			(3,788)			(9,222)	(5,931)
Personnel expense	0			0			0	0
Other expense	0			0			0	0
Interest income	1,296			(8)			2,628	279
Income tax (expense) benefit	(1,786)			(7,410)			(11,852)	(29,651)
Total other comprehensive income (loss)	5,342			21,967			35,454	87,836
Ending Balance	39,443	34,101		12,194	(9,773)		39,443	12,194
Defined Benefit Pension and Postretirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(36,021)		(37,172)	(49,290)		(49,330)	(37,172)	(49,330)
Other comprehensive income (loss) before reclassifications	0			0			0	0
Investment securities losses (gains), net	0			0			0	0
Personnel expense	(36)			(36)			(111)	(111)
Other expense	1,313			229			2,923	357
Interest income	0			0			0	0
Income tax (expense) benefit	(703)			(49)			(1,088)	(62)
Total other comprehensive income (loss)	573			144			1,724	184
Ending Balance	(35,448)	(36,021)		(49,146)	(49,290)		(35,448)	(49,146)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1,920)		(33,183)	(59,063)		(124,972)	(33,183)	(124,972)
Other comprehensive income (loss) before reclassifications	5,840			33,173			53,900	123,139
Investment securities losses (gains), net	(7)			(3,788)			(9,222)	(5,931)
Personnel expense	(36)			(36)			(111)	(111)
Other expense	1,313			229			2,923	357
Interest income	1,296			(8)			2,628	279
Income tax (expense) benefit	(2,489)			(7,458)			(12,939)	(29,713)
Total other comprehensive income (loss)	5,916	15,054	$ 16,209	22,111	44,311	$ 21,597	37,178	88,020
Ending Balance	$ 3,995	$ (1,920)		$ (36,953)	$ (59,063)		$ 3,995	$ (36,953)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	$ 49,243	$ 72,414	$ 187,521	$ 217,853
Noninterest Income (out-of-scope of Topic 606)	26,302	28,436	240,821	70,037
Total noninterest income	75,545	100,850	428,342	287,890
Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	114	20,954	45,153	69,403
Wealth management fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	21,152	21,015	62,884	61,885
Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	14,283	16,561	40,989	47,102
Card-based fees(b)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	10,207	10,501	28,735	29,973
Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	3,487	3,383	9,763	9,490
Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	27,541	24,870	77,688	73,308
Noninterest Income (out-of-scope of Topic 606)	9,864	8,801	33,566	27,827
Corporate and Commercial Specialty | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	57	109	179	283
Corporate and Commercial Specialty | Wealth management fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	21,152	20,313	61,496	59,828
Corporate and Commercial Specialty | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	4,458	3,307	12,316	10,113
Corporate and Commercial Specialty | Card-based fees(b)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	474	451	1,216	1,341
Corporate and Commercial Specialty | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	1,400	690	2,481	1,743
Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	21,738	47,322	109,712	143,750
Noninterest Income (out-of-scope of Topic 606)	11,220	12,612	30,730	27,533
Community, Consumer, and Business | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	55	20,842	44,965	69,110
Community, Consumer, and Business | Wealth management fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	0	792	1,387	2,148
Community, Consumer, and Business | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	9,816	13,243	28,653	36,945
Community, Consumer, and Business | Card-based fees(b)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	9,699	10,004	27,392	28,490
Community, Consumer, and Business | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	2,168	2,441	7,315	7,057
Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	(36)	222	121	797
Noninterest Income (out-of-scope of Topic 606)	5,218	7,023	176,525	14,675
Risk Management and Shared Services | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	2	3	8	10
Risk Management and Shared Services | Wealth management fees(a)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	0	(90)	0	(90)
Risk Management and Shared Services | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	10	12	19	44
Risk Management and Shared Services | Card-based fees(b)
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	34	45	127	143
Risk Management and Shared Services | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of Topic 606)	(82)	252	(33)	690
Operating Segments [Member] | Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Total noninterest income	37,405	33,671	111,254	101,135
Operating Segments [Member] | Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Total noninterest income	32,958	59,934	140,442	171,283
Operating Segments [Member] | Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Total noninterest income	5,182	7,245	176,646	15,472
Operating Segments [Member] | Risk Management and Shared Serivies [Member]
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 5,182	$ 7,245	$ 176,646	$ 15,472

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating Lease Costs(a)	$ 3,970	$ 2,708	$ 9,224	$ 8,502
Finance Lease Costs	39	0	115	0
Operating Lease Cash Flows	2,871	2,968	8,303	8,538
Finance Lease Cash Flows	40	$ 0	82	$ 0
Operating Lease Costs, Breaking of Leases with Consolidating Branches	$ 1,500		$ 1,500

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use asset	$ 35,963	$ 45,381
Finance lease right-of-use asset	1,069	2,188
Operating lease liability	40,833	49,292
Finance lease liability	$ 1,165	$ 2,209

Leases Operating Lease Informat

Leases Operating Lease Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Total lease payments	$ 45,630	$ 55,580
Operating Lease, Weighted Average Remaining Lease Term	6 years 3 months 25 days	6 years 9 months 29 days
Operating Lease, Weighted Average Discount Rate, Percent	3.28%	3.32%
Finance Lease, Liability, Payment, Due	$ 1,185	$ 4,827
Finance Lease, Weighted Average Remaining Lease Term	1 year 10 months 20 days	39 years 8 months 1 day
Finance Lease, Weighted Average Discount Rate, Percent	1.05%	3.99%
Equipment
Lessee, Lease, Description [Line Items]
Total lease payments	$ 386	$ 46
Operating Lease, Weighted Average Remaining Lease Term	2 years 8 months 26 days	9 months 29 days
Operating Lease, Weighted Average Discount Rate, Percent	0.47%	2.72%
Retail and corporate offices
Lessee, Lease, Description [Line Items]
Total lease payments	$ 38,593	$ 48,940
Operating Lease, Weighted Average Remaining Lease Term	5 years 10 months 24 days	6 years 5 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.07%	3.34%
Land
Lessee, Lease, Description [Line Items]
Total lease payments	$ 6,650	$ 6,594
Operating Lease, Weighted Average Remaining Lease Term	9 years 1 month 2 days	9 years 6 months 25 days
Operating Lease, Weighted Average Discount Rate, Percent	3.35%	3.21%
Finance Lease, Liability, Payment, Due	$ 1,185	$ 4,827
Finance Lease, Weighted Average Remaining Lease Term	1 year 10 months 20 days	39 years 8 months 1 day
Finance Lease, Weighted Average Discount Rate, Percent	1.05%	3.99%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating Leases
Three Months Ending December 31, 2020	$ 2,675
2021	10,158
2022	7,801
2023	5,559
2024	4,793
Beyond 2024	14,643
Total lease payments	45,630	$ 55,580
Less: interest	4,797
Present value of lease payments	40,833	49,292
Finance Leases
Three Months Ending December 31, 2020	40
2021	172
2022	973
2023	0
2024	0
Beyond 2024	0
Total lease payments	1,185	4,827
Less: interest	20
Present value of lease payments	1,165	$ 2,209
Total Leases
Three Months Ending December 31, 2020	2,715
2021	10,330
2022	8,774
2023	5,559
2024	4,793
Beyond 2024	14,643
Total lease payments	46,815
Less: interest	4,817
Present value of lease payments	$ 41,998

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Additional operating leases	$ 18	$ 16
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	42 years
Additional operating lease terms	6 years