Associated Banc-Corp (ASB) 10-K 9 Feb 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 05, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-31343
Entity Registrant Name	ASSOCIATED BANC-CORP
Entity Incorporation, State or Country Code	WI
Entity Tax Identification Number	39-1098068
Entity Address, Address Line One	433 Main Street
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	54301
City Area Code	920
Local Phone Number	491-7500
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,058,439,343
Entity Common Stock, Shares Outstanding		152,831,898
Documents Incorporated by Reference	Portions of the registrant's Proxy Statement for the Annual Meeting of Shareholders to held on April 27, 2021 are incorporated by reference in this Form 10-K into Part III.
Entity Central Index Key	0000007789
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Amendment Flag	false
NEW YORK STOCK EXCHANGE, INC.
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 | NEW YORK STOCK EXCHANGE, INC.
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 | NEW YORK STOCK EXCHANGE, INC.
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 | NEW YORK STOCK EXCHANGE, INC.
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 [Member] | NEW YORK STOCK EXCHANGE, INC.
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		Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks		$ 416,154	$ 373,380
Interest-bearing deposits in other financial institutions		298,759	207,624
Federal funds sold and securities purchased under agreements to resell		1,135	7,740
Investment securities AFS, at fair value		3,085,441	3,262,586
Investment securities HTM, net, at amortized cost(a)		1,878,938	2,205,083
Equity securities		15,106	15,090
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		168,280	227,347
Residential loans held for sale		129,158	136,280
Commercial loans held for sale		0	15,000
Loans		24,451,724	22,821,440
Allowance for loan losses(a)		(383,702)	(201,371)
Loans, net		24,068,022	22,620,068
Tax credit and other investments		297,232	279,969
Premises and equipment, net		418,914	435,284
Bank and corporate owned life insurance		679,647	671,948
Goodwill		1,109,300	1,176,230
Other intangible assets, net		68,254	88,301
Mortgage servicing rights, net		41,961	67,306
Interest receivable		90,263	91,196
Other assets	[1]	653,219	506,046
Total assets		33,419,783	32,386,478
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits		7,661,728	5,450,709
Interest-bearing deposits		18,820,753	18,328,355
Total deposits		26,482,481	23,779,064
Federal funds purchased and securities sold under agreements to repurchase		192,971	433,097
Commercial paper		59,346	32,016
FHLB advances		1,632,723	3,180,967
Other long-term funding		549,465	549,343
Allowance for unfunded commitments		47,776	21,907
Accrued expenses and other liabilities		364,088	467,961
Total liabilities		29,328,850	28,464,355
Stockholders’ Equity
Preferred equity		353,512	256,716
Common stock		1,752	1,752
Surplus		1,720,329	1,716,431
Retained earnings(a)		2,458,920	2,380,867
Accumulated other comprehensive income (loss)		12,618	(33,183)
Treasury stock, at cost		(456,198)	(400,460)
Total common equity		3,737,421	3,665,407
Total stockholders’ equity		4,090,933	3,922,124
Total liabilities and stockholders’ equity		$ 33,419,783	$ 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		153,540,224	157,171,247
[1]	(a) See Note 1 Summary of Significant Accounting Policies for additional details on the adoption of ASU 2016-13.

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income
Interest and fees on loans		$ 785,241	$ 998,099	$ 976,990
Interest and dividends on investment securities
Taxable		59,806	100,304	119,741
Tax-exempt		58,320	57,565	44,782
Other interest		9,473	16,643	12,623
Total interest income		912,840	1,172,610	1,154,137
Interest expense
Interest on deposits		67,639	237,286	176,118
Interest on federal funds purchased and securities sold under agreements to repurchase		485	1,579	2,006
Interest on other short-term funding		51	138	180
Interest on PPPLF Funding		1,984
Interest on FHLB advances		57,359	69,816	73,668
Interest on long-term funding		22,365	28,116	22,585
Total interest expense		149,883	336,936	274,557
Net interest income		762,957	835,674	879,580
Provision for credit losses		174,006	16,000	0
Net interest income after provision for credit losses		588,950	819,674	879,580
Noninterest income
Noninterest Income In Scope of Topic 606		246,077	288,247	290,084
Capital markets, net		27,966	19,862	20,120
Mortgage banking, net		45,580	31,878	19,911
Bank and corporate owned life insurance		13,771	14,845	13,951
Asset gains (losses), net(b)	[1]	155,589	2,713	(1,103)
Investment securities gains (losses), net		9,222	5,957	(1,985)
Gains on sale of branches, net		7,449	0	0
Other		10,200	11,165	9,051
Total noninterest income		514,056	380,824	355,568
Noninterest expense
Personnel		432,151	487,063	482,676
Technology		81,214	82,429	72,674
Occupancy		64,064	62,399	59,121
Business development and advertising		18,428	29,600	30,923
Equipment		21,705	23,550	23,243
Legal and professional		21,546	19,901	23,061
Loan and foreclosure costs		12,600	8,861	7,410
FDIC assessment		20,350	16,250	30,000
Other intangible amortization		10,192	9,948	8,159
Loss on prepayments of FHLB advances		44,650
Other		46,688	46,666	55,530
Total noninterest expense		776,034	793,988	821,799
Income before income taxes		326,972	406,509	413,349
Income tax expense		20,200	79,720	79,786
Net income		306,771	326,790	333,562
Preferred stock dividends		18,358	15,202	10,784
Net income available to common equity		$ 288,413	$ 311,587	$ 322,779
Earnings per common share
Basic		$ 1.87	$ 1.93	$ 1.92
Diluted		$ 1.86	$ 1.91	$ 1.89
Average common shares outstanding
Basic		153,005	160,534	167,345
Diluted		153,642	161,932	169,732
Insurance commissions and fees
Noninterest income
Noninterest Income In Scope of Topic 606		$ 45,245	$ 89,104	$ 89,511
Wealth management fees(a)
Noninterest income
Noninterest Income In Scope of Topic 606	[2]	84,957	83,467	82,562
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606		56,307	63,135	66,075
Card-based fees(b)
Noninterest income
Noninterest Income In Scope of Topic 606		38,605	39,912	39,810
Card-based fees		38,534	39,755	39,656
Other revenue
Noninterest income
Noninterest Income In Scope of Topic 606		20,963	12,629	12,126
Card-based fees		19,238	18,942	17,818
Risk Management and Shared Serivies [Member]
Noninterest expense
Loss on prepayments of FHLB advances		45,000
Operating Segments [Member] | Risk Management and Shared Serivies [Member]
Noninterest expense
Acquisition related costs(c)	[3]	$ 2,447	$ 7,320	$ 29,002
[1]	(b) The year ended December 31, 2020 includes a gain of $163 million from the sale of ABRC. The year ended December 31, 2019 includes less than $1 million of Huntington related asset losses. The year ended December 31, 2018 includes approximately $2 million of Bank Mutual acquisition related asset losses net of asset gains.
[2]	(a) Includes trust, asset management, brokerage, and annuity fees.
[3]	(c) Includes the First Staunton, Huntington branch, and Bank Mutual acquisition related costs only.

Consolidated Statements of In_2

Consolidated Statements of Income - (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Huntington National Bank
Related acquisition asset losses net of asset gains	less than $1 million
Bank Mutual [Member]
Gain (Loss) on Disposition of Assets for Financial Service Operations		$ 2
ABRC [Member] | Risk Management and Shared Serivies [Member]
Gain (Loss) on Disposition of Assets for Financial Service Operations	$ 163

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 306,771	$ 326,790	$ 333,562
Investment securities AFS
Net unrealized gains (losses)	55,628	111,592	(39,891)
Amortization of net unrealized (gains) losses on AFS securities transferred to HTM securities	3,359	895	(572)
Reclassification adjustment for net losses (gains) realized in net income	(9,222)	(5,957)	1,985
Reclassification from OCI due to change in accounting principle	0	0	(84)
Reclassification of certain tax effects from OCI	0	0	(8,419)
Income tax (expense) benefit	(12,429)	(26,898)	9,791
Other comprehensive income (loss) on investment securities AFS	37,336	79,631	(37,189)
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(148)	(148)	(148)
Net actuarial (loss) gain	7,780	16,296	(28,612)
Amortization of actuarial loss (gain)	3,897	476	2,203
Reclassification of certain tax effects from OCI	0	0	(5,235)
Income tax (expense) benefit	(3,064)	(4,465)	6,767
Other comprehensive income (loss) on pension and postretirement obligations	8,465	12,158	(25,025)
Other Comprehensive Income (Loss), Net of Tax	45,801	91,789	(62,214)
Comprehensive income	$ 352,572	$ 418,579	$ 271,348

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Performance/Service Based RSAs, RSA, [Member]	Board Authorized Purchase Program [Member]	Preferred Equity	Preferred EquityCumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock [Member]	Common Stock [Member]Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Surplus	SurplusCumulative Effect, Period of Adoption, Adjusted Balance [Member]	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment [Member]	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance [Member]	Retained EarningsSeries C Preferred Stock	Retained EarningsSeries D Preferred Stock	Retained EarningsSeries E Preferred Stock	Retained EarningsSeries F Preferred Stock [Member]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Treasury Stock	Treasury StockCumulative Effect, Period of Adoption, Adjusted Balance [Member]	Treasury StockPerformance/Service Based RSAs, RSA, [Member]	Treasury StockBoard Authorized Purchase Program [Member]
Beginning balance at Dec. 31, 2017		$ 3,237,443					$ 159,929		$ 1,618		$ 1,338,722		$ 1,934,696							$ (62,758)		$ (134,764)
Preferred stock shares outstanding, beginning balance (in shares) at Dec. 31, 2017							165,000
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2017									161,752,000
Comprehensive income:
Net income		333,562											333,562
Other Comprehensive Income, Other, Net of Tax		(48,476)																		(48,476)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		(13,738)																		(13,738)
Other comprehensive income (loss)		(62,214)																		(62,214)
Comprehensive income		271,348
Issuance of preferred stock		97,315					$ 97,315
Common stock issued:
Stock-based compensation plans, net		18,408									(7,116)		15,096									10,428
Common Stock Issued During Period, Shares, Acquisitions									13,705,000
Issuance of treasury stock for acquisition		488,408							$ 137		396,975											91,296
Purchase of common stock returned to authorized but unissued, shares									(1,357,000)
Purchase of common stock returned to authorized but unissued, amount		(33,075)							$ (14)		(33,061)
Purchase of Treasury Stock					$ (7,148)	$ (206,450)																		$ (7,148)	$ (206,450)
Cash dividends
Common stock dividends		(105,519)											(105,519)
Preferred stock dividends	[1]	(10,784)											(10,784)
Issuance of preferred stock							100,000
Issuance of preferred stock		97,315					$ 97,315
Purchase of Preferred Stock Repurchased During Period, Shares							1,000
Purchase of stock, value		537					$ 528						8
Common Stock Shares from Warrant Exercises									1,116,000
Proceeds from Warrant Exercises		1							$ (11)		12
Stock-based compensation expense, net		17,107									17,107
Tax Act Reclassification		13,654											13,654
Change in Accounting Principal		84											84
Other		632											632
Ending balance at Dec. 31, 2018		3,780,888					$ 256,716		$ 1,752		1,712,615		2,181,414							(124,972)		(246,638)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2018							264,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2018									175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid																$ 1.53125	$ 1.34375	$ 0.322309
Net income		326,790											326,790
Other comprehensive income (loss)		91,789																		91,789
Comprehensive income		418,579
Stock-based compensation plans, net		11,216									(21,038)											32,254
Purchase of Treasury Stock					(8,592)	(177,484)																		(8,592)	(177,484)
Common stock dividends		(111,804)											(111,804)
Preferred stock dividends	[2]	(15,202)											(15,202)
Stock-based compensation expense, net		24,854									24,854
Other		(331)											(331)
Ending 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)
Ending balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019			$ (98,337)											$ (98,337)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2019							264,000	264,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2019		157,171,247							175,216,000	175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid																1.53125	1.34375	1.46875
Net income		$ 306,771											306,771
Other comprehensive income (loss)		45,801																		45,801
Comprehensive income		352,572
Issuance of preferred stock		96,796					$ 96,796
Stock-based compensation plans, net		3,966									(17,663)											21,629
Purchase of Treasury Stock					$ (6,113)	$ (71,255)																		$ (6,113)	$ (71,255)
Common stock dividends		(112,023)											(112,023)
Preferred stock dividends	[3]	(18,358)											(18,358)
Issuance of preferred stock							100,000
Issuance of preferred stock		96,796					$ 96,796
Stock-based compensation expense, net		21,561									21,561
Ending balance at Dec. 31, 2020		$ 4,090,933					$ 353,512		$ 1,752		$ 1,720,329		$ 2,458,920							$ 12,618		$ (456,198)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2020							364,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2020		153,540,224							175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid																$ 1.53125	$ 1.34375	$ 1.46875	$ 0.7881181
[1]	(a) Series C, $1.53125 per share; Series D, $1.34375 per share; and Series E, $0.322309 per share.
[2]	(b) Series C, $1.53125 per share; Series D, $1.34375 per share; and Series E, $1.46875 per share.
[3]	(c) Series C, $1.53125 per share; Series D, $1.34375 per share; Series E, $1.46875 per share; and Series F, $0.7881181 per share.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income		$ 306,771	$ 326,790	$ 333,562
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		174,006	16,000	0
Depreciation and amortization		50,567	58,149	48,253
Addition to (recovery of) valuation allowance on mortgage servicing rights, net		17,704	63	(545)
Amortization of mortgage servicing rights		22,664	12,432	9,594
Amortization of other intangible assets		10,192	9,948	8,159
Amortization and accretion on earning assets, funding, and other, net		25,028	23,573	11,624
Net amortization of tax credit investments		25,556	20,062	19,425
Losses (gains) on sales of investment securities, net		(9,222)	(5,957)	1,985
Asset (gains) losses, net	[1]	(155,589)	(2,713)	1,103
(Gains) on sale of branches, net		(7,449)	0	0
(Gain) loss on mortgage banking activities, net		(59,379)	(20,120)	(22,497)
Mortgage loans originated for sale		(1,642,135)	(1,090,792)	(1,092,318)
Proceeds from sales of mortgage loans held for sale		1,959,571	1,317,077	1,131,652
Pension contributions		0	0	(41,877)
(Increase) decrease in interest receivable		933	7,595	(7,417)
Increase (decrease) in interest payable		(11,385)	2,495	10,407
Increase (decrease) in accrued expenses		(29,057)	723	30,924
Increase (decrease) in derivative position		(113,760)	(102,966)	40,950
Increase (decrease) in net income tax position		(47,268)	43,908	18,178
Net change in other assets and other liabilities		32,270	(42,005)	(4,594)
Net cash provided by operating activities		550,020	574,260	496,567
Cash Flows from Investing Activities
Net increase in loans		(1,640,524)	(137,990)	(326,464)
Purchases of
AFS securities		(1,648,938)	(460,124)	(737,580)
HTM securities		(125,480)	(423,682)	(682,622)
Federal Home Loan Bank and Federal Reserve Bank stocks		(84,152)	(246,836)	(347,323)
Premises, equipment, and software		(54,682)	(67,459)	(65,854)
Other intangibles		(200)	0	0
Proceeds from
Sales of AFS securities		626,283	1,367,476	601,130
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks		144,000	270,023	282,145
Prepayments, calls, and maturities of AFS investment securities		1,343,056	561,659	633,859
Prepayments, calls, and maturities of HTM investment securities		449,078	260,510	217,836
Sales, prepayments, calls and maturities of other assets		27,964	10,250	41,856
Net change in tax credit and alternative investments		(55,134)	(67,632)	(57,327)
Net cash (paid) received in acquisitions		31,518	551,250	59,472
Net cash provided by (used in) investing activities		(793,737)	1,617,446	(380,872)
Cash Flows from Financing Activities
Net increase (decrease) in deposits		2,497,378	(1,842,748)	270,481
Net decrease in deposits due to branch sales		(222,878)	0	0
Net increase (decrease) in short-term funding		(238,655)	308,039	(581,371)
Net increase (decrease) in short-term FHLB advances		(520,000)	(380,000)	616,000
Repayment of long-term FHLB advances		(1,040,972)	(764,657)	(2,150,016)
Proceeds from long-term FHLB advances		4,215	751,573	1,837,680
Redemption of Corporation's senior notes		0	(250,000)	0
Repayment of finance lease principal		(1,081)	(1)	0
Proceeds from issuance of long-term funding		0	0	300,000
Proceeds from issuance of preferred shares		96,796	0	97,315
Proceeds from issuance of common stock for stock-based compensation plans		3,966	11,216	18,408
Common stock warrants exercised		0	0	(1)
Purchase of preferred shares		0	0	(537)
Purchase of common stock returned to authorized but unissued		0	0	(33,075)
Cash dividends on common stock		(112,023)	(111,804)	(105,519)
Cash dividends on preferred stock		(18,358)	(15,202)	(10,784)
Net cash provided by (used in) financing activities		371,020	(2,479,660)	44,983
Net increase (decrease) in cash, cash equivalents, and restricted cash		127,304	(287,954)	160,678
Cash, cash equivalents, and restricted cash at beginning of period		588,744	876,698	716,018
Cash, cash equivalents, and restricted cash at end of period		716,048	588,744	876,698
Supplemental disclosures of cash flow information
Cash paid for interest		159,291	332,919	261,724
Cash paid for income and franchise taxes		17,734	41,131	18,335
Loans and bank premises transferred to OREO		19,261	10,513	26,517
Capitalized mortgage servicing rights		13,667	11,606	10,722
Loans transferred into held for sale from portfolio, net		264,570	313,570	33,010
Transfer of HTM securities to AFS securities (adoption of ASU 2019-04)		0	692,414	0
Unsettled trades to purchase securities		0	0	883
Acquisitions
Total cash, cash equivalents, and restricted cash shown on the consolidated statements of cash flows		588,744	588,744	716,018
ABRC [Member]
Proceeds from
Net cash received in ABRC sale		256,511	0	0
Performance/Service Based RSAs, RSA, [Member]
Cash Flows from Financing Activities
Payments for Repurchase of Common Stock		6,113	8,592	7,148
Board Authorized Purchase Program [Member]
Cash Flows from Financing Activities
Payments for Repurchase of Common Stock		$ 71,255	$ 177,484	$ 206,450
[1]	(b) The year ended December 31, 2020 includes a gain of $163 million from the sale of ABRC. The year ended December 31, 2019 includes less than $1 million of Huntington related asset losses. The year ended December 31, 2018 includes approximately $2 million of Bank Mutual acquisition related asset losses net of asset gains.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Standards Update and Change in Accounting Principle [Text Block]	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. The following is a description of the more significant of those policies. Business Associated Banc-Corp is a bank holding company headquartered in Wisconsin. The Corporation provides a full range of banking and related financial services to consumer and commercial customers through its network of bank and nonbank subsidiaries. The Corporation is subject to competition from other financial and non-financial institutions that offer similar or competing products and services. The Corporation is regulated by federal and state agencies and is subject to periodic examinations by those agencies. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Parent Company and its subsidiaries. Investments in unconsolidated entities (none of which are considered to be variable interest entities in which the Corporation is the primary beneficiary) are accounted for using the cost method of accounting when the Corporation has determined that the cost method is appropriate. Investments not meeting the criteria for cost method accounting are accounted for using the equity method of accounting. Investments in unconsolidated entities are included in tax credit and other investments on the consolidated balance sheets, and the Corporation’s share of income or loss is recorded in other noninterest income, while distributions in excess of the investment are recorded in asset gains (losses), net. All significant intercompany balances and transactions have been eliminated in consolidation. 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. Business Combinations The Corporation accounts for its acquisitions using the purchase accounting method. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets that must be recognized. Typically, this allocation results in the purchase price exceeding the fair value of net assets acquired, which is recorded as goodwill. CDIs are a measure of the value of checking, money market and savings deposits acquired in business combinations accounted for under the purchase method. CDIs and other identified intangibles with finite useful lives are amortized using the straight line method over their estimated useful lives of up to ten years. Fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. For PCD loans, the credit discount includes estimated future credit losses expected over the life of the loan. The credit discount is recorded through a gross up of the allowance for loan loss and the corresponding loan. Adjustments to the allowance for loan losses are made through the provision for credit losses after the date of acquisition. Purchased performing loans are recorded at fair value, including credit, interest, and liquidity discounts. The fair value discount is accreted as an adjustment to yield over the estimated lives of the loans. There is no allowance for loan losses established at the acquisition date for purchased performing loans. A provision for credit losses is recorded at the time of acquisition for purchased non-PCD loans. See Note 2 for additional information on the Corporation's acquisitions. Investment Securities Securities are classified as HTM, AFS, or equity on the consolidated balance sheets at the time of purchase. Investment securities classified as HTM, which management has the positive intent and ability to hold to maturity, are reported at amortized cost. Investment securities classified as AFS, which management has the intent and ability to hold for an indefinite period of time, but not necessarily to maturity, are carried at fair value, with unrealized gains and losses, net of related deferred income taxes, included in stockholders’ equity as a separate component of OCI. Investment securities classified as equity securities are carried at fair value with changes in fair value immediately reflected in the consolidated statements of income. Any decision to sell investment securities AFS would be based on various factors, including, but not limited to, asset / liability management strategies, changes in interest rates or prepayment risks, liquidity needs, or regulatory capital considerations. Realized gains or losses on investment security sales (using specific identification method) are included in investment securities gains (losses), net, on the consolidated statements of income. Premiums and discounts are amortized or accreted into interest income over the estimated life (earlier of call date, maturity, or estimated life) of the related security, using a prospective method that approximates level yield. In certain situations, management may elect to transfer certain investment securities from the AFS classification to the HTM classification. In such cases, the investment securities are reclassified at fair value at the time of transfer. Any unrealized gain or loss included in accumulated other comprehensive income (loss) at the time of transfer is retained therein and amortized over the remaining life of the investment security as an adjustment to yield. Management measures expected credit losses on HTM securities on a collective basis by major security type. Accrued interest receivable on HTM 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 HTM, net, at amortized cost on the consolidated balance sheets For AFS 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 OCI. 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 AFS security is uncollectible or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on AFS debt securities is excluded from the estimate of credit losses. See Note 3 for additional information on investment securities. FHLB and Federal Reserve Bank Stocks The Corporation is required to maintain Federal Reserve 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. See Note 3 for additional information on the FHLB and Federal Reserve Bank Stocks. Loans Held for Sale Residential Loans Held for Sale: Residential loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are carried at estimated fair value. As a result of holding these loans at fair value, changes in the secondary market are reflected in earnings immediately, as opposed to being dependent upon the timing of sales. The estimated fair value is based on what secondary markets are currently offering for portfolios with similar characteristics. Commercial Loans Held for Sale: Commercial loans held for sale are carried at the lower of cost or estimated fair value. The estimated fair value is based on a discounted cash flow analysis. Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the effective interest method. An ACLL is established for estimated credit losses in the loan portfolio. See Allowance for Credit Losses below for further policy discussion. See Note 4 for additional information on loans. Nonaccrual Loans: Management considers a loan to be nonaccrual when it believes it will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Interest income on loans is based on the principal balance outstanding computed using the effective interest method. The accrual of interest income for commercial loans is discontinued when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, while the accrual of interest income for consumer loans is discontinued when loans reach specific delinquency levels. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on a nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal. While a loan is in nonaccrual status, some or all of the cash interest payments received may be treated as interest income on a cash basis as long as the remaining recorded investment in the loan (i.e., after charge off of identified losses, if any) is deemed to be fully collectible. The determination as to the ultimate collectability of the loan's remaining recorded investment must be supported by a current, well documented credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months. See Note 4 for additional information on loans. Troubled Debt Restructurings (“Restructured Loans”) : Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. In addition, all accruing restructured loans are reported as TDRs, which are individually analyzed by management. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. See Note 4 for additional information on restructured loans. Allowance for Credit Losses on Loans: The allowance for loan losses is a reserve for estimated 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 estimate of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flow of these loans. Actual credit losses, net of recoveries, are deducted from the allowance for loan losses. A provision for credit losses, which is a charge against earnings, is recorded to bring the allowance for loan losses to a level that, in management’s judgment, is appropriate to absorb the expected lifetime losses in the loan portfolio. The methodology applied by the Corporation is designed to assess the appropriateness of the allowance for loan losses within the Corporation's loan segmentation. The methodology also 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 and property types in CRE for commercial loans and loan types for consumer loans, consideration of historical loan 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 credit 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 inputs, see Note 4. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flows of the loan. Because each of the criteria used is subject to change, the analysis of the allowance for loan losses is not necessarily indicative of the trend of future loan losses in any particular loan category. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio. 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 ACLL attributable to the loan is allocated based on management’s estimate of the borrower’s ability to repay the loan given the availability of collateral, other sources of cash flows, as well as evaluation of legal options available to the Corporation. The amount of expected loan loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the fair value of the underlying collateral less applicable selling costs, or the observable market price of the loan. If foreclosure is probable or the loan is collateral dependent, impairment is measured using the fair value of the loan’s collateral, less costs to sell. Large groups of homogeneous loans, such as residential mortgage, home equity, and other consumer, are collectively evaluated for impairment. 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 4 for additional information on the ACLL and Note 16 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. Management believes that the level of the ACLL is appropriate. While management uses currently available information to recognize losses on loans, future adjustments to the ACLL may be necessary based on newly received appraisals, updated commercial customer financial statements, rapidly deteriorating cash flow, and changes in economic conditions that affect our customers. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Corporation’s ACLL. Such agencies may require additions to the ACLL or may require that certain loan balances be charged off or downgraded into criticized loan categories when their credit evaluations differ from those of management based on their judgments about information available to them at the time of their examinations. See Loans above for further policy discussion and see Note 4 for additional information on the allowance for loan losses. 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. Premises and Equipment and Software Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed on the straight-line method over the estimated useful lives of the related assets or the lease term. Maintenance and repairs are charged to expense as incurred, while additions or major improvements are capitalized and depreciated over the estimated useful lives. Leasehold improvements are amortized on a straight-line basis over the lesser of the lease terms, including extension options which the Corporation has determined are reasonably certain to be exercised, or the estimated useful lives of the improvements. Software, included in other assets on the consolidated balance sheets, is amortized on a straight-line basis over the lesser of the contract terms or the estimated useful life of the software. See Note 6 for additional information on premises and equipment. Goodwill and Intangible Assets Goodwill and Other Intangible Assets: The excess of the cost of an acquisition over the fair value of the net assets acquired consists primarily of goodwill, CDIs, and other identifiable intangibles (primarily related to customer relationships acquired). CDIs have estimated finite lives and are amortized on a straight-line basis to expense over a 10-year period. The other intangibles have estimated finite lives and are amortized on a straight-line basis over their expected useful life. The Corporation reviews long-lived assets and certain identifiable intangibles for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, in which case an impairment charge would be recorded. Goodwill is not amortized but, instead, is 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 impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired. If the carrying value of a reporting unit exceeds its calculated fair value, an impairment charge is assessed, limited to the amount of goodwill allocated to that reporting unit. See Note 5 for additional information on goodwill and other intangible assets. Mortgage Servicing Rights : The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Upon sale, a MSRs asset is capitalized, which represents the then current fair value of future net cash flows expected to be realized for performing servicing activities. MSRs, when purchased, are initially recorded at fair value. As the Corporation has not elected to subsequently measure any class of servicing assets under the fair value measurement method, the Corporation follows the amortization method. MSRs are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date. MSRs are carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value, on the consolidated balance sheets. The Corporation periodically evaluates its MSRs asset for impairment. 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. 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 5 for additional information on MSRs. Income Taxes Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes, which arise principally from temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities, are included in the amounts provided for income taxes. In assessing the realizability of DTAs, management considers whether it is more likely than not that some portion or all of the DTAs will not be realized. The ultimate realization of DTAs is dependent upon the generation of future taxable income and tax planning strategies which will create taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, the amount of taxes paid in available carryback years, projected future taxable income, and, if necessary, tax planning strategies in making this assessment. The Corporation files a consolidated federal income tax return and separate or combined state income tax returns. Accordingly, amounts equal to tax benefits of those subsidiaries having taxable federal or state losses or credits are offset by other subsidiaries that incur federal or state tax liabilities. It is the Corporation’s policy to provide for uncertainty in income taxes as a part of income tax expense based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. At December 31, 2020 and 2019, the Corporation believes it has appropriately accounted for any unrecognized tax benefits. To the extent the Corporation prevails in matters for which a liability for an unrecognized tax benefit was established or is required to pay amounts in excess of the liability established, the Corporation’s effective tax rate in a given financial statement period may be impacted. See Note 13 for additional information on income taxes. Derivative and Hedging Activities Derivative instruments, including derivative instruments embedded in other contracts, are carried at fair value on the consolidated balance sheets with changes in the fair value recorded to earnings or accumulated other comprehensive income, as appropriate. On the date the derivative contract is entered into, the Corporation designates the derivative as a fair value hedge (i.e., a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e., a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a free-standing derivative instrument. For a derivative designated as a fair value hedge, the changes in the fair value of the derivative instrument and the changes in the fair value of the hedged asset or liability are recognized in current period earnings as an increase or decrease to the carrying value of the hedged item on the balance sheet and in the related income statement account. Amounts within accumulated other comprehensive income are reclassified into earnings in the period the hedged item affects earnings. For a derivative designated as a free-standing derivative instrument, changes in fair value are reported in current period earnings. The free-standing derivative instruments included: interest rate risk management, commodity hedging, and foreign currency exchange solutions. The Corporation is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet. The Corporation uses master netting arrangements to mitigate counterparty credit risk in derivative transactions. To the extent the derivatives are subject to master netting arrangements, the Corporation takes into account the impact of master netting arrangements that allow the Corporation to settle all derivative contracts executed with the same counterparty on a net basis, and to offset the net derivative position with the related cash collateral. 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. See Note 14 for additional information on derivatives and hedging activities. Securities Sold Under Agreement to Repurchase The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings 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 counterpar

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Acquisitions and Dispositions	Note 2 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 recorded approximately $15 million in goodwill related to the First Staunton acquisition during the first quarter of 2020. The Corporation subsequently reduced goodwill by $2 million during the second quarter of 2020 as a result of updates that increased the fair value of MSRs acquired. In addition, the Corporation increased goodwill by $1 million during the fourth quarter of 2020 as a result of a decrease in deferred taxes. Goodwill created by the acquisition is not tax deductible. See Note 5 for additional information on goodwill, as well as the carrying amount and amortization of CDI assets related to the First Staunton acquisition. The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the First Staunton acquisition: ($ in Thousands) Purchase Accounting Adjustments February 14, 2020 Assets Cash and cash equivalents $ — $ 44,782 Investment securities AFS (24) 98,743 Federal Home Loan Bank and Federal Reserve Bank stocks, at cost — 781 Loans (4,808) 369,741 Premises and equipment, net (3,005) 4,865 Bank owned life insurance 9 6,770 Goodwill 14,812 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 7,379 7,379 OREO (included in other assets on the face of the consolidated balance sheets) 670 762 Other assets 2,795 7,692 Total assets $ 556,328 Liabilities Deposits $ 1,285 $ 438,684 Other borrowings 61 34,613 Accrued expenses and other liabilities 179 6,730 Total liabilities $ 480,028 Total consideration paid $ 76,300 For a description of methods used to determine the fair value of significant assets and liabilities presented on the balance sheet above, see Assumptions section of this Note. The Corporation has purchased loans with the First Staunton acquisition, for which there was, at acquisition, evidence of more than insignificant deterioration of credit quality since origination (PCD). The carrying amount of those loans is as follows: ($ in Thousands) February 14, 2020 Purchase price of loans at acquisition $ 77,221 Allowance for credit losses at acquisition 3,504 Non-credit discount/(premium) at acquisition (951) Par value of acquired loans at acquisition $ 79,774 The Corporation acquired no PCD securities in connection with the acquisition. 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 Corporation recorded approximately $7 million in goodwill related to the Huntington branch acquisition. Goodwill created by the acquisition is tax deductible. See Note 5 for additional information on goodwill, as well as the carrying amount and amortization of CDI assets related to the Huntington branch acquisition. The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the Huntington branch acquisition: ($ 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 For a description of the methods used to determine the fair value of significant assets and liabilities presented on the balance sheet above, see Assumptions section of this Note. 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. Loans were grouped together according to similar characteristics when applying various valuation techniques. CDIs: This intangible asset represents the value of the relationships with deposit customers. The fair value was estimated based on a discounted cash flow methodology that gave appropriate consideration to expected customer attrition rates, net maintenance cost of the deposit base, alternative cost of funds, and the interest costs associated with customer deposits. The CDIs are being amortized on a straight-line basis over 10 years. Time deposits: The fair values 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 values 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 on the 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. Branch Sales On December 11, 2020, the Bank completed the sale of 5 branches in Peoria, IL to Morton Community Bank. Under the terms of the transaction, the Bank sold $180 million in total deposits and no loans. The Bank received a 4% purchase premium on deposits transferred. With the sale of these branches, the Bank exited the Peoria market. On December 11, 2020, the Bank closed on the sale of 2 branches in southwest Wisconsin to Royal Bank. Under the terms of the transaction, the Bank sold $53 million in total deposits and no loans. The Bank received a 4% purchase premium on deposits transferred in the Prairie du Chien and Richland Center branches. Pending:

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 3 Investment Securities Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. See Note 1 for the Corporation’s accounting policy for investment securities. The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U.S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U.S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA/FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943 The amortized cost and fair values of securities AFS and HTM at December 31, 2019 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS 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 AFS $ 3,251,950 $ 30,920 $ (20,284) $ 3,262,586 Investment securities HTM 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 HTM $ 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 AFS and HTM at December 31, 2020, are shown below: AFS HTM ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 7,385 $ 7,394 $ 29,665 $ 29,938 Due after one year through five years 83,293 84,112 54,313 56,196 Due after five years through ten years 350,687 371,076 187,853 197,850 Due after ten years 38,113 42,650 1,171,068 1,292,485 Total debt securities 479,478 505,231 1,442,900 1,576,469 Residential mortgage-related securities FNMA / FHLMC 1,448,806 1,461,241 54,599 57,490 GNMA 231,364 235,537 114,553 118,813 Commercial mortgage-related securities FNMA / FHLMC 19,654 22,904 11,211 11,211 GNMA 511,429 524,756 255,742 264,960 Asset backed securities FFELP 329,030 327,189 — — SBA 8,637 8,584 — — Total investment securities $ 3,028,399 $ 3,085,441 $ 1,879,005 $ 2,028,943 Ratio of Fair Value to Amortized Cost 101.9 % 108.0 % On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020: ($ in Thousands) AAA AA A Total U.S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,252 860,607 14,041 1,441,900 Residential mortgage-related securities FNMA/FHLMC 54,599 — — 54,599 GNMA 114,553 — — 114,553 Commercial mortgage-related securities FNMA/FHLMC 11,211 — — 11,211 GNMA 255,742 — — 255,742 Total HTM securities $ 1,004,357 $ 860,607 $ 14,041 $ 1,879,005 Investment securities gains (losses), net includes proceeds from the sale of investment securities as well as any applicable write-ups or write-downs of investment securities. The proceeds from the sale and write-up of investment securities for each of the three years ended December 31 are shown below. ($ in Thousands) 2020 2019 2018 Gross gains on AFS securities $ 9,312 $ 6,374 $ 1,954 Gross (losses) on AFS securities (90) (13,861) (3,938) Write-up of equity securities without readily determinable fair values — 13,444 — Investment securities gains (losses), net $ 9,222 $ 5,957 $ (1,985) Proceeds from sales of investment securities $ 626,283 $ 1,367,476 $ 601,130 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 third quarter of 2019, the Corporation made a one-time election to transfer municipal securities with an amortized cost of $692 million from HTM to AFS, as permitted by the adoption of ASU 2019-04 during the quarter. The Corporation sold shorter duration, lower yielding municipal securities that were included in the transfer for proceeds of $157 million at a gain of $3 million, with the proceeds being reinvested into longer duration, higher yielding HTM municipal securities. Additionally, for the year ended 2019, the Corporation sold $1.2 billion of taxable, floating rate ABS and shorter duration MBS, CMBS, and CMOs 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 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. During 2018, the Corporation executed a strategy to improve the yield on securities and increase interest income during the current and future calendar years. During the third quarter of 2018, the Corporation sold mortgage-related securities totaling approximately $108 million at a slight gain with all proceeds reinvested into higher yielding securities. The tax equivalent yield of the securities sold was 3.08% while the reinvestment was at 3.51%. During the second quarter of 2018, the Corporation also sold $40 million of lower yielding GNMA commercial mortgage-related securities. In addition, on February 1, 2018, the date the Bank Mutual acquisition was completed, the Corporation sold Bank Mutual's entire $453 million securities portfolio. The Corporation originally reinvested the proceeds from the sale of the Bank Mutual securities portfolio into GNMA residential mortgage-related securities with the goal of reinvesting future cash flows into municipal securities. That strategy was completed during August 2018. Investment securities with a carrying value of approximately $1.6 billion and $2.6 billion at December 31, 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 HTM securities totaled $14 million and $16 million at December 31, 2020 and 2019, respectively. Accrued interest receivable on AFS securities totaled $8 million and $10 million at December 31, 2020 and 2019, respectively. Accrued interest receivable on both HTM and AFS securities is included in interest receivable on the consolidated balance sheets. There was no interest income reversed for investments going into nonaccrual at December 31, 2020 or 2019. A security is considered past due once it is 30 days past due under the terms of the agreement. At December 31, 2020, the Corporation had no past due HTM securities. The allowance for credit losses on HTM securities was approximately $67,000 at December 31, 2020, attributable entirely to the Corporation's municipal securities, included in investment securities HTM, net, at amortized cost on the consolidated balance sheets. The Corporation also holds U.S. Treasury and mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and, as a result, no allowance for credit losses has been recorded related to these securities. The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized (Losses) Fair Investment securities AFS Residential mortgage-related securities FNMA / FHLMC 7 $ (500) $ 163,002 — $ — $ — $ (500) $ 163,002 GNMA 2 (3) 9,784 — — — (3) 9,784 GNMA commercial mortgage-related securities 1 — 287 — — — — 287 Asset backed securities FFELP 1 (129) 9,267 16 (2,885) 178,681 (3,013) 187,948 SBA 14 (53) 8,379 — — — (53) 8,379 Other debt securities 2 — 2,000 — — — — 2,000 Total 27 $ (685) $ 192,720 16 $ (2,885) $ 178,681 $ (3,570) $ 371,400 Investment securities HTM GNMA residential mortgage-related securities 1 $ — $ 325 — $ — $ — $ — $ 325 Total 1 $ — $ 325 — $ — $ — $ — $ 325 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS 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 HTM 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 AFS investment securities portfolio on a quarterly basis to monitor its credit exposure. A determination as to whether a security’s decline in fair value is the result of credit risk takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in 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 security and industry specific economic conditions. Based on the Corporation’s evaluation, management does not believe any unrealized losses at December 31, 2020 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. The U.S. Treasury 3 year and 5 year rates decreased by 145 bp and 133 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 bank 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 December 31, 2020 and 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 December 31, 2020 and 2019, respectively. Accrued interest receivable on FHLB stock totaled approximately $972,000 and $2 million at December 31, 2020 and 2019, respectively. There was no accrued interest receivable on Federal Reserve Bank stock at either December 31, 2020 or 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 December 31, 2020 and 2019, the Corporation had equity securities with readily determinable fair values of $2 million. Equity securities without readily determinable fair values: The Corporation's portfolio of equity securities without readily determinable fair values consists of 77,996 Visa Class B restricted shares, 77,000 of which the Corporation received in 2008 as part of Visa's initial public offering and carried at fair value after the Corporation donated 42,039 Visa Class B restricted shares

Loans

Loans	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Note 4 Loans Loans at December 31 are summarized below: ($ in Thousands) 2020 2019 PPP $ 767,757 $ — Commercial and industrial 7,701,422 7,354,594 Commercial real estate - owner occupied 900,912 911,265 Commercial and business lending 9,370,091 8,265,858 Commercial real estate - investor 4,342,584 3,794,517 Real estate construction 1,840,417 1,420,900 Commercial real estate lending 6,183,001 5,215,417 Total commercial 15,553,091 13,481,275 Residential mortgage 7,878,324 8,136,980 Home equity 707,255 852,025 Other consumer 313,054 351,159 Total consumer 8,898,632 9,340,164 Total loans $ 24,451,724 $ 22,821,440 Accrued interest receivable on loans totaled $66 million at December 31, 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 $3 million for the year ended December 31, 2020. The Corporation has granted loans to its directors, executive officers, or their related interests. These loans were made on substantially the same terms, including rates and collateral, as those prevailing at the time for comparable transactions with other unrelated customers, and do not involve more than a normal risk of collection. These loans to related parties are summarized below: ($ in Thousands) 2020 2019 Balance at beginning of year $ 16,772 $ 17,831 New loans 19,140 3,673 Repayments (6,643) (8,053) Change due to status of executive officers and directors 152 3,320 Balance at end of year $ 29,420 $ 16,772 The following table presents commercial and consumer loans by credit quality indicator by vintage year at December 31, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 745,767 $ — $ — $ — $ — $ — $ 745,767 Special Mention — — 3,988 — — — — — 3,988 Potential Problem — — 18,002 — — — — — 18,002 PPP $ — $ — $ 767,757 $ — $ — $ — $ — $ — $ 767,757 Commercial and industrial: Risk rating: Pass $ 4,628 $ 2,177,138 $ 1,389,260 $ 1,435,519 $ 1,182,302 $ 483,957 $ 305,998 $ 453,734 $ 7,427,908 Special Mention — 10,159 2,719 39,854 37,042 113 215 67 90,169 Potential Problem (c) 2,565 7,237 19,331 28,413 56,580 2,269 6,477 1,179 121,487 Nonaccrual (d) 16,852 — 6,238 5,789 17,014 16,623 8,781 7,414 61,859 Commercial and industrial $ 24,045 $ 2,194,534 $ 1,417,548 $ 1,509,575 $ 1,292,938 $ 502,962 $ 321,471 $ 462,394 $ 7,701,422 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,022 $ 185,861 $ 209,069 $ 128,360 $ 99,546 $ 147,366 $ 79,111 $ 867,335 Special Mention — 113 1,882 3,122 300 658 264 — 6,339 Potential Problem — 3,486 4,104 8,916 — 1,490 4,437 3,747 26,179 Nonaccrual — — — — — 318 — 740 1,058 Commercial real estate - owner occupied $ 1,150 $ 21,621 $ 191,847 $ 221,107 $ 128,660 $ 102,012 $ 152,067 $ 83,598 $ 900,912 Commercial and business lending: Risk rating: Pass $ 5,778 $ 2,195,160 $ 2,320,888 $ 1,644,588 $ 1,310,662 $ 583,503 $ 453,364 $ 532,845 $ 9,041,009 Special Mention — 10,272 8,589 42,976 37,342 771 479 67 100,496 Potential Problem (c) 2,565 10,723 41,437 37,329 56,580 3,759 10,915 4,926 165,668 Nonaccrual (d) 16,852 — 6,238 5,789 17,014 16,941 8,781 8,154 62,917 Commercial and business lending $ 25,195 $ 2,216,154 $ 2,377,152 $ 1,730,682 $ 1,421,598 $ 604,974 $ 473,539 $ 545,992 $ 9,370,091 Commercial real estate - investor: Risk rating: Pass $ 10,971 $ 171,497 $ 1,249,644 $ 976,332 $ 720,237 $ 271,987 $ 341,658 $ 211,360 $ 3,942,714 Special Mention — — 90,235 97,333 12,339 — 21,882 8,465 230,254 Potential Problem — 838 16,343 13,575 30,911 2,279 239 27,209 91,396 Nonaccrual 19,803 — 10,141 53,056 446 14,267 — 309 78,220 Commercial real estate - investor $ 30,774 $ 172,335 $ 1,366,364 $ 1,140,297 $ 763,933 $ 288,533 $ 363,779 $ 247,343 $ 4,342,584 Real estate construction: Risk rating: Pass $ 776 $ 47,880 $ 645,925 $ 738,561 $ 294,910 $ 25,219 $ 2,420 $ 16,768 $ 1,771,682 Special Mention — — 487 494 48,283 42 — 30 49,336 Potential Problem — — 135 — 18,803 — 93 15 19,046 Nonaccrual — — — — — 16 — 338 353 Real estate construction $ 776 $ 47,880 $ 646,547 $ 739,055 $ 361,996 $ 25,277 $ 2,513 $ 17,150 $ 1,840,417 Commercial real estate lending: Risk rating: Pass $ 11,746 $ 219,377 $ 1,895,569 $ 1,714,893 $ 1,015,146 $ 297,205 $ 344,078 $ 228,127 $ 5,714,396 Special Mention — — 90,722 97,827 60,622 42 21,882 8,494 279,590 Potential Problem — 838 16,479 13,575 49,714 2,279 332 27,224 110,442 Nonaccrual 19,803 — 10,141 53,056 446 14,283 — 647 78,573 Commercial real estate lending $ 31,549 $ 220,215 $ 2,012,911 $ 1,879,352 $ 1,125,929 $ 313,810 $ 366,292 $ 264,493 $ 6,183,001 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 17,524 $ 2,414,537 $ 4,216,457 $ 3,359,482 $ 2,325,808 $ 880,708 $ 797,441 $ 760,973 $ 14,755,405 Special Mention — 10,272 99,311 140,803 97,964 813 22,361 8,562 380,086 Potential Problem (c) 2,565 11,561 57,916 50,905 106,295 6,038 11,247 32,150 276,111 Nonaccrual (d) 36,655 — 16,379 58,845 17,460 31,224 8,781 8,801 141,490 Total commercial $ 56,745 $ 2,436,370 $ 4,390,063 $ 3,610,033 $ 2,547,526 $ 918,783 $ 839,831 $ 810,485 $ 15,553,091 Residential mortgage: Risk rating: Pass $ — $ — $ 2,185,240 $ 1,490,589 $ 615,118 $ 998,072 $ 911,797 $ 1,612,971 $ 7,813,788 Special Mention — — — 355 330 102 126 537 1,450 Potential Problem — — 1,200 689 652 — 179 1,028 3,749 Nonaccrual — — 1,478 2,271 5,882 7,116 11,003 31,587 59,337 Residential mortgage $ — $ — $ 2,187,918 $ 1,493,903 $ 621,983 $ 1,005,290 $ 923,105 $ 1,646,124 $ 7,878,324 Home equity: Risk rating: Pass $ 10,224 $ 569,389 $ 2,057 $ 12,968 $ 15,792 $ 11,594 $ 5,803 $ 76,165 $ 693,767 Special Mention 596 631 — 39 14 39 4 804 1,532 Potential Problem — 1,922 — — — — — 146 2,068 Nonaccrual 1,600 100 965 134 410 319 711 7,249 9,888 Home equity $ 12,421 $ 572,041 $ 3,022 $ 13,141 $ 16,216 $ 11,952 $ 6,518 $ 84,364 $ 707,255 Other consumer: Risk rating: Pass $ 70 $ 165,114 $ 9,525 $ 10,309 $ 3,987 $ 1,872 $ 1,185 $ 120,425 $ 312,416 Special Mention 5 438 13 16 11 4 7 8 498 Nonaccrual 5 33 9 49 21 10 — 18 140 Other consumer $ 81 $ 165,585 $ 9,547 $ 10,374 $ 4,019 $ 1,886 $ 1,192 $ 120,451 $ 313,054 Total consumer: Risk rating: Pass $ 10,294 $ 734,502 $ 2,196,822 $ 1,513,865 $ 634,897 $ 1,011,539 $ 918,785 $ 1,809,561 $ 8,819,971 Special Mention 602 1,069 13 410 356 145 137 1,349 3,480 Potential Problem — 1,922 1,200 689 652 — 179 1,174 5,817 Nonaccrual 1,605 133 2,452 2,454 6,313 7,445 11,714 38,854 69,364 Total consumer $ 12,501 $ 737,626 $ 2,200,487 $ 1,517,417 $ 642,218 $ 1,019,128 $ 930,816 $ 1,850,939 $ 8,898,632 Total loans: Risk rating: Pass $ 27,819 $ 3,149,039 $ 6,413,278 $ 4,873,347 $ 2,960,705 $ 1,892,247 $ 1,716,226 $ 2,570,534 $ 23,575,376 Special Mention 602 11,341 99,324 141,213 98,320 958 22,498 9,911 383,566 Potential Problem (c) 2,565 13,483 59,116 51,593 106,947 6,038 11,426 33,324 281,928 Nonaccrual (d) 38,260 133 18,831 61,298 23,773 38,669 20,496 47,655 210,854 Total loans $ 69,246 $ 3,173,996 $ 6,590,550 $ 5,127,451 $ 3,189,745 $ 1,937,912 $ 1,770,647 $ 2,661,424 $ 24,451,724 (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 $41 million of oil and gas related loans (d) Includes $37 million of oil and gas related loans The following table presents commercial and consumer loans by credit quality indicator at December 31, 2019: ($ 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 policies for allowance for loan losses, allowance for unfunded commitments, nonaccrual loans, and charge offs. See Note 1 for the Corporation's accounting policy for loans. For commercial loans, management has determined the pass credit quality indicator to include credits that exhibit 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 that 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 December 31, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 767,757 $ — $ — $ — $ — $ 767,757 Commercial and industrial 7,633,269 2,819 3,300 175 61,859 7,701,422 Commercial real estate - owner occupied 899,480 158 215 — 1,058 900,912 Commercial and business lending 9,300,506 2,977 3,516 175 62,917 9,370,091 Commercial real estate - investor 4,251,571 1,024 11,769 — 78,220 4,342,584 Real estate construction 1,839,073 991 — — 353 1,840,417 Commercial real estate lending 6,090,644 2,015 11,769 — 78,573 6,183,001 Total commercial 15,391,150 4,992 15,284 175 141,490 15,553,091 Residential mortgage 7,808,294 8,975 1,410 308 59,337 7,878,324 Home equity 692,565 3,071 1,731 — 9,888 707,255 Other consumer 310,200 1,039 560 1,115 140 313,054 Total consumer 8,811,060 13,085 3,701 1,423 69,364 8,898,632 Total loans $ 24,202,209 $ 18,077 $ 18,985 $ 1,598 $ 210,854 $ 24,451,724 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4103 of the CARES Act. (b) Of the total nonaccrual loans, $128 million, or 61%, were current with respect to payment at December 31, 2020. (c) No interest income was recognized on nonaccrual loans for the year ended December 31, 2020. In addition, there were $140 million of nonaccrual loans for which there was no related ACLL at December 31, 2020. The following table presents loans by past due status at December 31, 2019: Accruing ($ in Thousands) Current 30-59 Days 60-89 Days 90+ Days 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 n 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. See Note 1 for the Corporation's accounting policy for TDRs. The following table presents nonaccrual and performing restructured loans by loan portfolio: December 31, 2020 December 31, 2019 December 31, 2018 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 12,713 $ 6,967 $ 16,678 $ 7,376 $ 25,478 $ 249 Commercial real estate - owner occupied 1,711 — 1,676 — 2,080 — Commercial real estate - investor 26,435 225 293 — 799 933 Real estate construction 260 111 298 179 311 198 Residential mortgage 7,825 11,509 3,955 13,035 16,036 22,279 Home equity 1,957 1,379 1,896 1,904 7,385 2,627 Other consumer 1,191 — 1,246 1 1,174 6 Total restructured loans (b) $ 52,092 $ 20,190 $ 26,041 $ 22,494 $ 53,263 $ 26,292 (a) Nonaccrual restructured loans have been included within nonaccrual loans. (b) Does not include any restructured loans related to the COVID-19 pandemic in accordance with Section 4013 of the CARES Act. The Corporation had a recorded investment of approximately $36 million in loans modified in a TDR for the year ended December 31, 2020, of which $30 million were in accrual status, included in pass or special mention based on their risk rating within the credit quality tables, and $6 million were in nonaccrual, within the credit quality tables, pending a sustained period of repayment. Short-term loan modifications made in good faith to help ease the adverse effects of the COVID-19 pandemic are not categorized as TDRs in accordance with the CARES Act. As of December 31, 2020, there were approximately $11 million of commitments to lend additional funds to borrowers with restructured loans. The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance: Years Ended December 31, 2020 2019 2018 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 7 $ 1,823 $ 2,059 6 $ 7,588 $ 7,703 5 $ 1,315 $ 1,330 Commercial real estate - owner occupied 4 658 689 — — — — — — Commercial real estate - investor 10 26,563 26,567 — — — 2 1,393 1,472 Real estate construction — — — 1 77 77 1 78 80 Residential mortgage 36 6,031 6,113 53 7,436 7,517 41 6,977 7,210 Home equity 20 1,078 1,697 24 831 845 34 1,649 1,681 Other consumer — — — 1 8 8 3 17 19 Total loans modified 77 $ 36,154 $ 37,125 85 $ 15,940 $ 16,150 86 $ 11,429 $ 11,792 (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. For the year ended December 31, 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 year ended December 31, 2020. The following table provides the number of loans modified in a TDR during the previous twelve months which subsequently defaulted during the years ended December 31, 2020, 2019, and 2018, respectively, as well as the recorded investment in these restructured loans as of December 31, 2020, 2019, and 2018, respectively: Years Ended December 31, 2020 2019 2018 ($ in Thousands) Number of Recorded Number of Recorded Number of Recorded Commercial and industrial — $ — — $ — 3 $ — Commercial real estate — investor — — 1 461 — — Residential mortgage 5 1,036 38 5,630 20 3,553 Home equity 4 208 27 868 32 1,688 Total loans modified 9 $ 1,244 66 $ 6,959 55 $ 5,241 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 $68 million at December 31, 2020. Of the loans classified as probable TDRs at December 31, 2020, $55 million are within the oil and gas portfolio and $13 million is in the CRE portfolio. Allowance for Credit Losses on Loans The ACLL is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the ACLL represents management’s estimate of an amount appropriate to provide for expected lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimates of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. A main factor in the determination of the ACLL is the economic forecast. The Corporation utilized Moody's baseline forecast, updated during December 2020, in the allowance model. The forecast is applied over a 2 year reasonable and supportable period with straight-line reversion to the historical losses over the second year of the period. See Note 1 for the Corporation's accounting policy on the ACLL. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). See Note 16 for additional information on the change in the allowance for unfunded commitments. The following table presents a summary of the changes in the ACLL by portfolio segment for the year ended December 31, 2020: ($ in Thousands) Dec. 31, 2019 Cumulative effect of ASU 2016-13 adoption (CECL) Jan. 1, 2020 Charge offs Recoveries Net Charge offs Gross up of allowance for PCD loans at acquisition Provision recorded at acquisition Provision for credit losses Dec. 31, 2020 ACLL / Loans Allowance for loan losses PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 Commercial and industrial 91,133 52,919 144,052 (80,320) 7,004 (73,316) 293 408 71,355 142,793 Commercial real estate — owner occupied 10,284 (1,851) 8,433 (419) 147 (272) 890 255 1,967 11,274 Commercial and business lending 101,417 51,068 152,485 (80,739) 7,151 (73,588) 1,183 663 73,853 154,598 Commercial real estate — investor 40,514 2,041 42,555 (22,920) 643 (22,277) 753 472 71,933 93,435 Real estate construction 24,915 7,467 32,382 (19) 49 31 435 492 25,854 59,193 Commercial real estate lending 65,428 9,508 74,937 (22,938) 692 (22,246) 1,188 964 97,787 152,629 Total commercial 166,846 60,576 227,422 (103,677) 7,844 (95,834) 2,371 1,627 171,641 307,226 Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 Home equity 10,926 11,649 22,575 (1,719) 1,978 259 422 374 (4,781) 18,849 Other consumer 6,639 7,016 13,655 (4,790) 1,101 (3,689) 61 140 4,462 14,630 Total consumer 34,525 51,880 86,405 (8,376) 3,579 (4,797) 1,134 917 (7,183) 76,475 Total loans $ 201,371 $ 112,457 $ 313,828 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,543 $ 164,457 $ 383,702 Allowance for unfunded commitments Commercial and industrial $ 12,276 $ (3,998) $ 8,278 $ — $ — $ — $ — $ 61 $ 13,972 $ 22,311 Commercial real estate — owner occupied 127 — 127 — — — — 4 135 266 Commercial and business lending 12,403 (3,998) 8,405 — — — — 65 14,108 22,577 Commercial real estate — investor 530 246 776 — — — — 2 (141) 636 Real estate construction 7,532 18,347 25,879 — — — — 45 (7,038) 18,886 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 (7,179) 19,522 Total commercial 20,465 14,595 35,060 — — — — 112 6,929 42,099 Home equity 1,038 2,591 3,629 — — — — 66 (577) 3,118 Other consumer 405 1,504 1,909 — — — — — 649 2,557 Total consumer 1,443 4,095 5,538 — — — — 66 72 5,676 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 7,000 $ 47,776 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 0.07 % Commercial and industrial 103,409 48,921 152,330 (80,320) 7,004 (73,316) 293 469 85,327 165,105 2.14 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 147 (272) 890 259 2,102 11,539 1.28 % Commercial and business lending 113,820 47,070 160,890 (80,739) 7,151 (73,588) 1,183 728 87,961 177,175 1.89 % Commercial real estate — investor 41,044 2,287 43,331 (22,920) 643 (22,277) 753 474 71,792 94,071 2.17 % Real estate construction 32,447 25,814 58,261 (19) 49 31 435 537 18,816 78,079 4.24 % Commercial real estate lending 73,490 28,101 101,591 (22,938) 692 (22,246) 1,188 1,011 90,608 172,151 2.78 % Total commercial 187,311 75,171 262,482 (103,677) 7,844 (95,834) 2,371 1,739 178,569 349,326 2.25 % Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,865) 42,997 0.55 % Home equity 11,964 14,240 26,204 (1,719) 1,978 259 422 440 (5,358) 21,967 3.11 % Other consumer 7,044 8,520 15,564 (4,790) 1,101 (3,689) 61 140 5,111 17,187 5.49 % Total consumer 35,968 55,975 91,943 (8,376) 3,579 (4,797) 1,134 983 (7,112) 82,151 0.92 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,722 $ 171,457 $ 431,478 1.76 % 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) 65,428 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) 4,158 (6,558) (9,766) 34,525 Total loans $ 238,023 $ (74,313) $ 19,161 $ (55,152) $ 18,500 $ 201,371 Loans acquired in a business combination after January 1, 2020 are recorded in accordance with ASC Topic 326. See Note 2 for more information on loans acquired in a business combination. After January 1, 2020, acquired loans were segregated into two types: • Non-PCD loans are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not show evidence of credit deterioration since origination. The allowance for loan losses on these loans is recorded through provision for credit losses on the consolidated statements of income at acquisition. • PCD loans are loans demonstrating more than insignificant credit deterioration and are accounted for with ASC Topic 326-30. Under this guidance, the credit mark on acquired assets grosses up the allowance for credit losses and the amortized cost of the loan. 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 Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note 5 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. See Note 1 for the Corporation’s accounting policy for goodwill and other intangible assets. 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 were no events since the May 2020 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2020, 2019, or 2018. Each of the valuation techniques employed by the Corporation requires significant assumptions. Depending upon the specific approach, assumptions are made regarding the economic environment including forecasted cash flow projections, expected net interest margins, long-term growth rates, discount rates used for cash flows, 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 Corporation’s expected future cash flows or estimated growth rates, or a prolonged decline in the price of the Corporation’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. The Corporation had goodwill of $1.1 billion at December 31, 2020 and $1.2 billion at December 31, 2019. As of December 31, 2020, there was an increase of $15 million relating to the First Staunton acquisition, and an $82 million reduction related to the disposition of ABRC. Goodwill increased $7 million in 2019, due to the Huntington branch acquisition. See Note 2 for additional information on the Corporation's acquisitions and dispositions. 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 $17 million decrease due to the sale of ABRC during the second quarter of 2020. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) 2020 2019 2018 Core deposit intangibles Gross carrying amount at the beginning of the year $ 80,730 $ 58,100 $ — Additions during the period 7,379 22,630 58,100 Accumulated amortization (21,205) (12,456) (5,326) Net book value $ 66,904 $ 68,274 $ 52,774 Amortization during the year $ 8,749 $ 7,130 $ 5,326 Other intangibles Gross carrying amount at the beginning of the year $ 38,970 $ 44,887 $ 34,572 Additions during the period 200 — 10,359 Reductions due to sale (17,435) (217) (43) Accumulated amortization (20,385) (24,643) (21,825) Net book value $ 1,350 $ 20,027 $ 23,062 Amortization during the year $ 1,443 $ 2,818 $ 2,833 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. See Note 1 for the Corporation’s accounting policy for MSRs. See Note 16 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 18 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) 2020 2019 2018 Mortgage servicing rights Mortgage servicing rights at beginning of year $ 67,607 $ 68,433 $ 59,168 Additions from acquisition 1,357 — 8,136 Additions 13,667 11,606 10,722 Amortization (22,664) (12,432) (9,594) Mortgage servicing rights at end of year $ 59,967 $ 67,607 $ 68,433 Valuation allowance at beginning of year (302) (239) (784) (Additions) recoveries, net (17,704) (63) 545 Valuation allowance at end of year (18,006) (302) (239) Mortgage servicing rights, net $ 41,961 $ 67,306 $ 68,193 Fair value of mortgage servicing rights $ 41,990 $ 72,532 $ 81,012 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) 7,743,956 8,488,969 8,600,983 Mortgage servicing rights, net to servicing portfolio 0.54 % 0.79 % 0.79 % Mortgage servicing rights expense (a) $ 40,369 $ 12,494 $ 9,049 (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 December 31, 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 Year ending December 31, 2021 $ 8,811 $ 200 $ 12,895 2022 8,811 200 14,372 2023 8,811 200 10,178 2024 8,811 200 7,502 2025 8,811 200 5,726 Beyond 2025 22,849 350 9,295 Total Estimated Amortization Expense $ 66,904 $ 1,350 $ 59,967

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment See Note 1 for the Corporation’s accounting policy for premises and equipment. A summary of premises and equipment at December 31 is as follows: 2020 2019 ($ in Thousands) Estimated Cost Accumulated Net Book Net Book Land — $ 70,431 $ — $ 70,431 $ 69,649 Land improvements 3 – 15 years 18,488 8,716 9,771 9,355 Buildings and improvements 5 – 39 years 390,298 168,136 222,162 230,358 Computers 3 – 5 years 52,846 38,128 14,718 13,242 Furniture, fixtures and other equipment 3 – 15 years 174,362 116,304 58,058 53,342 Operating leases — 46,632 14,638 31,994 45,381 Leasehold improvements 3 – 15 years 33,706 21,925 11,781 13,958 Total premises and equipment $ 786,761 $ 367,847 $ 418,914 $ 435,284 Depreciation and amortization of premises and equipment totaled $34 million for 2020, 2019, and 2018.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Note 7 Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. The Corporation also has finance leases for land. These 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: Twelve Months Ended December 31, ($ in Thousands) 2020 2019 Operating Lease Costs $ 11,450 $ 11,006 Finance Lease Costs 154 36 Operating Lease Cash Flows 11,276 11,305 Finance Lease Cash Flows 122 35 The lease classifications on the consolidated balance sheets were as follows: Consolidated Balance Sheets Category December 31, 2020 December 31, 2019 ($ in Thousands) Amount Operating lease right-of-use asset Premises and equipment $ 31,994 $ 45,381 Finance lease right-of-use asset Other assets 962 2,188 Operating lease liability Accrued expenses and other liabilities 36,425 49,292 Finance lease liability Other long-term funding 1,128 2,209 The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: December 31, 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 2.49 0.46 % $ 46 0.83 2.72 % Retail and corporate offices 34,036 6.04 3.33 % 48,940 6.49 3.34 % Land 6,385 8.99 3.09 % 6,594 9.57 3.21 % Total operating leases $ 40,806 6.45 3.27 % $ 55,580 6.83 3.32 % Finance leases Land $ 1,145 1.65 1.05 % $ 4,827 39.67 3.99 % Total finance leases $ 1,145 1.65 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 Total Leases Twelve Months Ending December 31, 2021 $ 9,120 $ 172 $ 9,293 2022 6,791 973 7,763 2023 5,525 — 5,525 2024 4,760 — 4,760 2025 3,818 — 3,818 Beyond 2025 10,792 — 10,792 Total lease payments $ 40,806 $ 1,145 $ 41,952 Less: interest 4,382 17 4,399 Present value of lease payments $ 36,425 $ 1,128 $ 37,553 As of December 31, 2020 and 2019, additional operating leases, primarily retail and corporate offices, that had not yet commenced totaled $17 million and $16 million, respectively. The leases that had not yet commenced as of December 31, 2020, will commence between January 2021 and October 2023 with lease terms of 2 years to 6 years. The Corporation conducts a portion of its business through certain facilities and equipment under noncancelable operating leases. The Corporation also leases a subdivision of some of its facilities and receives rental income from such lease agreements. The approximate minimum annual rental payments and rental receipts under noncancelable agreements and leases with remaining terms in excess of one year are as follows: ($ in Thousands) Payments Receipts 2021 $ 9,208 $ 3,148 2022 10,189 2,595 2023 6,086 1,986 2024 5,439 1,736 2025 4,268 1,625 Thereafter 11,679 7,568 Total $ 46,868 $ 18,658 Total rental expense under leases, net of lease income, totaled $5 million in 2020 and 2019, respectively, and $10 million in 2018.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Deposits	Deposits The distribution of deposits at December 31 is as follows: ($ in Thousands) 2020 2019 Noninterest-bearing demand $ 7,661,728 $ 5,450,709 Savings 3,650,085 2,735,036 Interest-bearing demand 6,090,869 5,329,717 Money market 7,322,769 7,640,798 Brokered CDs — 5,964 Other time 1,757,030 2,616,839 Total deposits $ 26,482,481 $ 23,779,064 Time deposits of $100,000 or more were $682 million and $1.3 billion for December 31, 2020 and 2019, respectively. Time deposits of $250,000 or more were $341 million and $861 million at December 31, 2020 and 2019, respectively. Aggregate annual maturities of all time deposits at December 31, 2020, are as follows: Maturities During Year Ending December 31, ($ in Thousands) 2021 $ 1,371,671 2022 236,667 2023 77,545 2024 45,185 2025 25,951 Thereafter 11 Total $ 1,757,030

Short and Long-Term Funding

Short and Long-Term Funding	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	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) December 31, 2020 December 31, 2019 Short-Term Funding Federal funds purchased $ 7,070 $ 362,000 Securities sold under agreements to repurchase 185,901 71,097 Federal funds purchased and securities sold under agreements to repurchase 192,971 433,097 Commercial paper 59,346 32,016 Total short-term funding $ 252,317 $ 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 Finance leases 1,128 2,209 Capitalized costs (1,663) (2,866) Total long-term funding 549,465 549,343 Total short and long-term funding, excluding FHLB advances $ 801,782 $ 1,014,456 FHLB Advances Short-term FHLB advances $ — $ 520,000 Long-term FHLB advances 1,632,723 2,660,967 Total FHLB advances $ 1,632,723 $ 3,180,967 Total short and long-term funding $ 2,434,505 $ 4,195,422 Securities Sold Under Agreement to Repurchase The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). See Note 15 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 December 31, 2020, the Corporation pledged agency mortgage-related securities with a fair value of $262 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of December 31, 2020 and December 31, 2019 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total December 31, 2020 Repurchase agreements Agency mortgage-related securities $ 185,901 $ — $ — $ — $ 185,901 Total $ 185,901 $ — $ — $ — $ 185,901 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 had utilized the PPPLF. These borrowings from the Federal Reserve Bank match the term of the underlying loan, which had been pledged to secure the borrowings, with original terms of two or five years. The rate of this funding is 0.35%. In the fourth quarter of 2020, the Corporation paid off its obligation to the PPPLF in full. 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 7 for additional disclosure regarding the Corporation's leases. FHLB Advances At December 31, 2020, the Corporation had $1.6 billion of FHLB advances, down $1.5 billion, or 49%, 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. Under agreements with the FHLB of Chicago, FHLB advances (short-term and long-term) are secured by qualifying mortgages of the subsidiary bank (such as residential mortgage, residential mortgage loans held for sale, home equity, and CRE). At December 31, 2020, the Corporation had $9.9 billion of total collateral capacity, primarily supported by residential mortgage and home equity loans. The table below summarizes the maturities of the Corporation’s long-term funding, including long-term FHLB advances, at December 31, 2020: ($ in Thousands) Long Term Funding Weighted Average Contractual Long Term Funding Coupon Rate FHLB Weighted Average Contractual FHLB advance Coupon Rate Year 2021 $ 299,631 3.50 % $ 17,723 2.25 % 2022 967 1.07 % 7,383 3.70 % 2023 — — % 2,398 5.09 % 2024 — — % 633 — % 2025 248,867 4.25 % 1,000,215 2.34 % Thereafter — — % 604,371 2.32 % Total long-term funding $ 549,465 3.83 % $ 1,632,723 2.34 %

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Stockholders' Equity	Note 10 Stockholders' Equity Preferred Equity: In June 2015, the Corporation issued 2.6 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 6.125% Non-Cumulative Perpetual Preferred Stock, Series C, liquidation preference $1,000 per share. Dividends on the Series C Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 6.125%. Shares of the Series C Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series C Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment. The Series C Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on June 15, 2020, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends. Except in certain limited circumstances, the Series C Preferred Stock does not have any voting rights. On August 28, 2015, the Board of Directors authorized the repurchase of up to $10 million of depositary shares of the Corporation's Series C Preferred Stock. As of December 31, 2020, $10 million remained available under this repurchase authorization. In September 2016, the Corporation issued 4.0 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 5.375% Non-Cumulative Perpetual Preferred Stock, Series D, liquidation preference $1,000 per share. Dividends on the Series D Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.375%. Shares of the Series D Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series D Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment. The Series D Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on September 15, 2021, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends. Except in certain limited circumstances, the Series D Preferred Stock does not have any voting rights. On July 25, 2017, the Board of Directors authorized the repurchase of up to $15 million of depositary shares of the Corporation's Series D Preferred Stock. As of December 31, 2020, $14 million remained available under this repurchase authorization. In September 2018, the Corporation issued 4.0 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 5.875% Non-Cumulative Perpetual Preferred Stock, Series E, liquidation preference $1,000 per share. Dividends on the Series E Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.875%. Shares of the Series E Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series E Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment. The Series E Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on December 15, 2023, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends. Except in certain limited circumstances, the Series E Preferred Stock does not have any voting rights. In June 2020, the Corporation issued 4.0 million depositary shares, each representing a 1/40th interest in a share of the Corporation’s 5.625% Non-Cumulative Perpetual Preferred Stock, Series F, liquidation preference 1,000 per share. Dividends on the Series F Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.625%. Shares of the Series F Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series F Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment. The Series F Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on September 15, 2025, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends. Except in certain limited circumstances, the Series F Preferred Stock does not have any voting rights. Subsidiary Equity: At December 31, 2020, subsidiary equity equaled $4.0 billion. See Note 19 for additional information on regulatory requirements for the Bank. Common Stock Repurchases: In 2020, the Board of Directors did not approve any additional authorizations for the repurchase of the Corporation's common stock. In 2019, the Board of Directors approved additional authorizations for the repurchase of up to $250 million of the Corporation’s common stock. During 2020, the Corporation repurchased 4.3 million shares for $71 million (or an average cost per common share of $16.71), compared to 8.2 million shares for $177 million (or an average cost per common share of $21.62) during 2019. As of December 31, 2020, approximately $113 million remained available to repurchase shares of common stock under previously approved Board of Director authorizations. The repurchase of shares will be based on market and investment opportunities, capital levels, growth prospects, and any necessary regulatory approvals and other 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. The Corporation also repurchased shares in satisfaction of minimum tax withholding obligations in connection with settlements of equity compensation totaling approximately $6 million (321,488 shares at an average cost per common share of $19.01) during 2020, compared to approximately $9 million (397,969 shares at an average cost per common share of $21.59) during 2019. Other Comprehensive Income (Loss): See the Consolidated Statements of Comprehensive Income for a summary of activity in other comprehensive income (loss) and see Note 22 for a summary of the components of accumulated other comprehensive income (loss).

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Note 11 Stock-Based Compensation Stock-Based Compensation Plan In February 2020, the Board of Directors, with subsequent approval of the Corporation’s shareholders, approved the adoption of the 2020 Incentive Compensation Plan. All remaining shares available for grant under the 2017 Incentive Compensation Plan were rolled into the 2020 Plan. As of December 31, 2020, approximately 14.4 million shares remained available for grant under the 2020 Plan. Under the 2020 Plan, options are generally exercisable up to ten years from the date of grant, have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date, and vest ratably over four years. The Corporation also issues restricted stock awards under the 2020 Plan. The shares of restricted stock are restricted as to transfer, but are not restricted as to dividend payment or voting rights. Restricted stock units receive dividend equivalents but do not have voting rights. The transfer restrictions lapse over three years or four years, depending upon whether the awards are performance-based or service-based. Performance-based awards are based on earnings per share performance goals, relative total shareholder return, and continued employment or meeting the requirements for retirement and service-based awards are contingent upon continued employment or meeting the requirements for retirement. Performance-based restricted stock awards vest over a performance period of three years and service-based restricted stock awards vest ratably over four years. The 2020 Plan provides that restricted stock awards and stock options will immediately become fully vested upon retirement from the Corporation of retirement eligible colleagues. See Note 1 for the Corporation’s accounting policy for stock based compensation. Accounting for 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 retirement eligible colleagues, 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. 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. 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 that 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 2020, 2019, and 2018: 2020 2019 2018 Dividend yield 3.50 % 3.30 % 2.50 % Risk-free interest rate 1.60 % 2.60 % 2.60 % Weighted average expected volatility 21.00 % 24.00 % 22.00 % Weighted average expected life 5.75 years 5.75 years 5.75 years Weighted average per share fair value of options $2.39 $4.00 $4.47 A summary of the Corporation’s stock option activity for the year ended December 31, 2020 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Aggregate Outstanding at December 31, 2019 5,543 $ 20.13 6.25 years $ 16,043 Granted 1,697 18.43 Exercised (182) 13.77 Forfeited or expired (585) 21.07 Outstanding at December 31, 2020 6,473 $ 19.77 6.23 years $ 2,005 Options exercisable at December 31, 2020 4,038 $ 19.25 4.89 years $ 1,913 (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 years ended December 31, 2020, 2019, and 2018, the intrinsic value of stock options exercised was approximately $816 thousand, $4 million, and $10 million, respectively. The total fair value of stock options that vested was $4 million for the year ended December 31, 2020, $3 million for the year ended December 31, 2019, and $4 million for the year ended December 31, 2018. For the years ended December 31, 2020, 2019, and 2018, the Corporation recognized compensation expense of $4 million for each of the three years, for the vesting of stock options. Included in compensation expense for 2020 was $2 million of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At December 31, 2020, the Corporation had $3 million of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominantly through the first quarter 2024. The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2020: Restricted Stock Shares (a) Weighted Average Outstanding at December 31, 2019 2,393 $ 22.39 Granted 1,053 18.09 Vested (936) 22.59 Forfeited (218) 20.86 Outstanding at December 31, 2020 2,293 $ 20.46 (a) In thousands The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant. Expense for restricted stock awards of approximately $17 million was recorded for year ended December 31, 2020, $21 million for the year ended December 31, 2019 and $13 million for the year ended December 31, 2018. Included in compensation expense for 2020 was approximately $7 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $15 million of unrecognized compensation costs related to restricted stock awards at December 31, 2020, that is expected to be recognized over the remaining requisite service periods that extend predominantly through first quarter 2024. 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. As described in Note 10, the Board of Directors has authorized management to repurchase shares of the Corporation’s common stock each quarter in the market, to be made available for issuance in connection with the Corporation’s employee incentive

Retirement Plans

Retirement Plans	Feb. 14, 2020
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit retirement 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. Bank Mutual was acquired on February 1, 2018. The Bank Mutual Pension Plan was merged into the RAP on December 31, 2018. Bank Mutual's Postretirement Plan was merged into the Corporation's Postretirement Plan during the first quarter of 2018. 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 funded status and amounts recognized in the 2020 and 2019 consolidated balance sheets, as measured on December 31, 2020 and 2019, respectively, for the RAP and Postretirement Plan were as follows: RAP Postretirement RAP Postretirement ($ in Thousands) 2020 2020 2019 2019 Change in Fair Value of Plan Assets Fair value of plan assets at beginning of year $ 442,034 $ — $ 390,564 $ — Actual return on plan assets 58,802 — 67,377 — Employer contributions — 210 — 270 Gross benefits paid (21,987) (210) (15,907) (270) Fair value of plan assets at end of year (a) $ 478,849 $ — $ 442,034 $ — Change in Benefit Obligation Net benefit obligation at beginning of year $ 260,576 $ 2,545 $ 233,658 $ 2,523 Service cost 8,244 — 7,263 — Interest cost 8,185 78 9,752 104 Actuarial (gain) loss 24,998 (169) 25,810 188 Gross benefits paid (21,987) (210) (15,907) (270) Net benefit obligation at end of year (a) $ 280,017 $ 2,243 $ 260,576 $ 2,545 Funded (unfunded) status $ 198,832 $ (2,243) $ 181,458 $ (2,545) Noncurrent assets $ 198,832 $ — $ 181,458 $ — Current liabilities — (189) — (214) Noncurrent liabilities — (2,055) — (2,330) Asset (liability) recognized on the consolidated balance sheets $ 198,832 $ (2,243) $ 181,458 $ (2,545) (a) The fair value of the plan assets represented 171% and 170% of the net benefit obligation of the pension plan at December 31, 2020 and 2019, respectively. Amounts recognized in accumulated other comprehensive (income) loss, net of tax, as of December 31, 2020 and 2019 were as follows: RAP Postretirement RAP Postretirement ($ in Thousands) 2020 2020 2019 2019 Prior service cost $ (194) $ (477) $ (249) $ (533) Net actuarial loss 28,029 — 37,075 126 Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss $ 27,835 $ (477) $ 36,827 $ (406) Other changes in plan assets and benefit obligations recognized in OCI, net of tax, in 2020 and 2019 were as follows: RAP Postretirement RAP Postretirement ($ in Thousands) 2020 2020 2019 2019 Net actuarial gain (loss) $ 8,209 $ 169 $ 17,235 $ (188) Amortization of prior service cost (73) (75) (73) (75) Amortization of actuarial loss (gain) 3,897 — 480 (4) Income tax (expense) benefit (3,040) (23) (4,532) 67 Total Recognized in OCI $ 8,993 $ 71 $ 13,109 $ (200) The components of net pension cost for the RAP for 2020, 2019, and 2018 were as follows: ($ in Thousands) 2020 2019 2018 Service cost $ 8,244 $ 7,263 $ 7,540 Interest cost 8,185 9,752 9,125 Expected return on plan assets (25,595) (24,332) (23,195) Amortization of prior service cost (73) (73) (73) Amortization of actuarial loss (gain) 3,897 480 2,195 Recognized settlement loss (gain) — — 809 Total net periodic pension cost (income) $ (5,342) $ (6,910) $ (3,600) The components of net periodic benefit cost for the Postretirement Plan for 2020, 2019, and 2018 were as follows: ($ in Thousands) 2020 2019 2018 Interest cost $ 78 $ 104 $ 108 Amortization of prior service cost (75) (75) (75) Amortization of actuarial loss (gain) — (4) 8 Total net periodic benefit cost $ 3 $ 25 $ 41 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. As of December 31, 2020, the estimated actuarial losses and prior service cost that will be amortized during 2021 from accumulated other comprehensive income into net periodic pension cost for the RAP includes expense of $4 million for actuarial losses and income of approximately $73,000 for the prior service cost. For the Postretirement Plan, the estimated actuarial losses and prior service cost that will be amortized during 2021 from accumulated other comprehensive income into net periodic benefit cost includes income of approximately $75,000 for the prior service cost while no actuarial gains or losses are expected. RAP Postretirement RAP Postretirement 2020 2020 2019 2019 Weighted average assumptions used to determine benefit obligations Discount rate 2.40 % 2.40 % 3.20 % 3.20 % Rate of increase in compensation levels 2.00 % N/A 2.00 % N/A Weighted average assumptions used to determine net periodic benefit costs Discount rate 3.20 % 3.20 % 4.30 % 4.30 % Rate of increase in compensation levels 2.00 % N/A 3.00 % N/A Expected long-term rate of return on plan assets 6.20 % N/A 6.00 % N/A The expected long-term (more than 20 years) rate of return was estimated using market benchmarks for equities and bonds applied to the RAP’s anticipated asset allocations. The expected return on equities was computed utilizing a valuation framework, which projected future returns based on current equity valuations rather than historical returns. The actual rates of return for the RAP assets were 15.18% and 18.29% for 2020 and 2019, respectively. The RAP’s investments are exposed to various risks, such as interest rate, market, and credit risks. Due to the level of risks associated with certain investments and the level of uncertainty related to changes in the value of the investments, it is at least reasonably possible that changes in risks in the near term could materially affect the amounts reported. The investment objective for the RAP is to maximize total return with a tolerance for average risk. The RAP has a diversified portfolio designed to provide liquidity, current income, and growth of income and principal, with anticipated asset allocation ranges of: equity securities 50 to 70%, fixed-income securities 30 to 50%, alternative securities 0 to 15%, and other cash equivalents 0 to 10%. Based on changes in economic and market conditions, the Corporation could be outside of the allocation ranges for brief periods of time. The asset allocation for the RAP as of the December 31, 2020 and 2019 measurement dates, respectively, by asset category were as follows: Asset Category 2020 2019 Equity securities 53 % 51 % Fixed-income securities 33 % 33 % Group annuity contracts 11 % 11 % Alternative securities 1 % 3 % Other 2 % 2 % Total 100 % 100 % The RAP assets include cash equivalents, such as money market accounts, mutual funds, common / collective trust funds (which include investments in equity and bond securities), and a group annuity contract. Money market accounts are stated at cost plus accrued interest, mutual funds are valued at quoted market prices, investments in common / collective trust funds are valued at the amount at which units in the funds can be withdrawn, and the group annuity contract is valued at fair value by discounting the related cash flows based on current yields of similar instruments with comparable durations and considering the credit worthiness of the issuer. Based on these inputs, the following table summarizes the fair value of the RAP’s investments as of December 31, 2020 and 2019: Fair Value Measurements Using ($ in Thousands) December 31, 2020 Level 1 Level 2 Level 3 RAP Investments Money market account $ 9,429 $ 9,429 $ — $ — Common /collective trust funds 172,950 172,950 — — Mutual funds 245,605 245,605 — — Group annuity contracts 50,866 — — 50,866 Total RAP Investments $ 478,849 $ 427,983 $ — $ 50,866 Fair Value Measurements Using ($ in Thousands) December 31, 2019 Level 1 Level 2 Level 3 RAP Investments Money market account $ 8,903 $ 8,903 $ — $ — Common /collective trust funds 155,964 155,964 — — Mutual funds 227,112 227,112 — — Group annuity contracts 50,055 — — 50,055 Total RAP Investments $ 442,034 $ 391,979 $ — $ 50,055 The following presents a summary of the changes in the fair value of the RAP's Level 3 asset during the periods indicated. Fair Value Reconciliation of Level 3 RAP Investments 2020 2019 Fair value of group annuity contract at beginning of period $ 50,055 $ 47,265 Return on plan assets 3,499 5,495 Benefits paid (2,688) (2,704) Fair value of group annuity contract at end of period $ 50,866 $ 50,055 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. The Corporation did not make any contributions to the RAP during 2020 and 2019. The projected benefit payments were calculated using the same assumptions as those used to calculate the benefit obligations listed above. The projected benefit payments for the RAP and Postretirement Plan at December 31, 2020, reflecting expected future services, were as follows: ($ in Thousands) RAP Postretirement Plan Estimated future benefit payments 2021 $ 19,332 $ 191 2022 20,043 186 2023 19,785 181 2024 20,304 175 2025 21,766 168 2026-2030 91,228 732 The health care trend rate is an assumption as to how much the Postretirement Plan’s medical costs will change each year in the future. There are no remaining participants under age 65 in the Postretirement Plan. The actual change in 2020 health care premium rates for post-65 coverage was a decrease of 6.00%. The health care trend rate assumption for post-65 coverage is an increase of 5.50% in 2021 with the rate of increase slowing by 0.25% in each succeeding year, to an ultimate rate of 5.00% for 2023 and future years. A one percentage point change in the assumed health care cost trend rate would have the following effect: 2020 2019 ($ in Thousands) 100 bp Increase 100 bp Decrease 100 bp Increase 100 bp Decrease Effect on total of service and interest cost $ 5 $ (4) $ 7 $ (6) Effect on postretirement benefit obligation $ 141 $ (124) $ 170 $ (148) The Corporation also has a 401(k) and Employee Stock Ownership Plan (the “401(k) plan”). The Corporation’s contribution is determined by the Compensation and Benefits Committee of the Board of Directors. Total expenses related to contributions to the 401(k) plan were $15 million for 2020 and $16 million for both 2019 and 2018.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Note 13 Income Taxes The current and deferred amounts of income tax expense (benefit) were as follows: Years Ended December 31, ($ in Thousands) 2020 2019 2018 Current Federal $ 33,020 $ 50,560 $ 20,246 State 16,193 15,327 12,593 Total current 49,213 65,887 32,839 Deferred Federal (25,895) 14,094 34,941 State (3,118) (261) 12,006 Total deferred (29,013) 13,833 46,947 Total income tax expense $ 20,200 $ 79,720 $ 79,786 Temporary differences between the amounts reported on the financial statements and the tax bases of assets and liabilities resulted in deferred taxes. DTAs and liabilities at December 31, 2020 and 2019 were as follows: ($ in Thousands) 2020 2019 Deferred tax assets Allowance for loan losses $ 88,967 $ 48,790 Allowance for other losses 16,347 7,236 Accrued liabilities 4,673 4,005 Deferred compensation 27,896 28,018 Benefit of tax loss and credit carryforwards 9,789 13,444 Nonaccrual interest 1,763 1,299 Basis difference from equity securities and other investments 6,329 — Net unrealized losses on pension and postretirement benefits 9,110 12,174 Other 997 970 Total deferred tax assets $ 165,871 $ 115,936 Valuation allowance for deferred tax assets (251) (251) Total deferred tax assets after valuation allowance $ 165,620 $ 115,685 Deferred tax liabilities Prepaid expenses $ 63,113 $ 62,227 Goodwill 21,698 21,099 Mortgage banking activities 10,403 17,418 Deferred loan fee income 9,799 12,190 State deferred taxes 2,636 722 Lease financing 116 199 Bank premises and equipment 17,757 18,348 Purchase accounting 12,658 13,738 Basis difference from equity securities and other investments — 2,285 Net unrealized gains on AFS securities 13,568 1,139 Other 1,049 1,156 Total deferred tax liabilities $ 152,797 $ 150,521 Net deferred tax assets (liabilities) $ 12,823 $ (34,836) At December 31, 2020 and December 31, 2019, the valuation allowance for DTAs of approximately $251,000 was related to the deferred tax benefit of specific federal tax loss carryforwards of $3 million from a 2017 acquisition. The changes in the valuation allowance related to net operating losses for 2020 and 2019 were as follows: ($ in Thousands) 2020 2019 Valuation allowance for deferred tax assets, beginning of year $ (251) $ (251) (Increase) decrease in current year — — Valuation allowance for deferred tax assets, end of year $ (251) $ (251) At December 31, 2020, the Corporation had state net operating loss carryforwards of $92 million (of which $40 million was acquired from various acquisitions) that will begin expiring in 2031. At December 31, 2020, the Corporation had state income tax credit carryforwards of $2 million that will begin expiring in 2035. The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows: 2020 2019 2018 Federal income tax rate at statutory rate 21.0 % 21.0 % 21.0 % Increases (decreases) resulting from: Tax-exempt interest and dividends (3.9) % (3.3) % (2.6) % State income taxes (net of federal benefit) 3.7 % 3.5 % 3.7 % Bank owned life insurance (0.9) % (0.8) % (0.7) % Tax effect of tax credits and benefits, net of related expenses (1.8) % (0.9) % (0.7) % Tax reserve adjustments / settlements 0.1 % 0.2 % 1.5 % Net tax (benefit) expense from stock-based compensation 0.3 % (0.2) % (0.5) % Tax planning in response to the Tax Act — % — % (3.6) % Restructuring in conjunction with ABRC sale (13.7) % — % — % FDIC premium 0.8 % 0.5 % 0.9 % Other 0.6 % (0.4) % 0.3 % Effective income tax rate 6.2 % 19.6 % 19.3 % The decrease in the effective tax rate was primarily driven by corporate restructuring which allowed for the recognition of built in capital losses and tax basis step-up, which was done in conjunction with the sale of ABRC. Savings banks acquired by the Corporation in 1997 and 2004 qualified under provisions of the Internal Revenue Code that permitted them to deduct from taxable income an allowance for bad debts that differed from the provision for such losses charged to income for financial reporting purposes. Accordingly, no provision for income taxes has been made for $100 million of retained income at December 31, 2020. If income taxes had been provided, the deferred tax liability would have been approximately $25 million. Management does not expect this amount to become taxable in the future; therefore, no provision for income taxes has been made. The Corporation and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. The Corporation’s federal income tax returns are open and subject to examination from the 2017 tax return year and forward. The years open to examination by state and local government authorities varies by jurisdiction. A reconciliation of the beginning and ending amount of unrecognized tax benefits was as f ollows: ($ in Millions) 2020 2019 Balance at beginning of year $ 3 $ 2 Additions for tax positions related to current year — 1 Balance at end of year $ 3 $ 3 At December 31, 2020 and 2019, the total amounts of unrecognized tax benefits that, if recognized, would affect the effective tax rate were $3 million and $2 million, respectively. The Corporation recognizes interest and penalties accrued related to unrecognized tax benefits in the income tax expense line on the consolidated statements of income. Interest and penalty benefits were negligible at December 31, 2020 and December 31, 2019. Accrued interest and penalties were negligible at both December 31, 2020 and December 31, 2019. Management does not anticipate significant adjustments to the total amount of unrecognized tax benefits within the next twelve months.

Derivative and Hedging Activiti

Derivative and Hedging Activities	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Note 14 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 $72 million of investment securities as collateral at December 31, 2020, and pledged $57 million of investment securities as collateral at December 31, 2019. Cash is often pledged as collateral for derivatives that are not centrally cleared. At December 31, 2020, the Corporation posted $31 million cash collateral compared to $14 million at December 31, 2019. See Note 18 for fair value information and disclosures and see Note 1 for the Corporation's accounting policy for derivative and hedging activities. 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 15 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 Corporation's derivatives, as well as the balance sheet netting adjustments as of December 31, 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 December 31, 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. The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments: December 31, 2020 December 31, 2019 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Notional Amount Fair Notional Amount Fair Notional Amount Fair Not designated as hedging instruments Interest rate-related instruments $ 3,639,679 $ 192,518 $ 3,639,679 $ 25,680 $ 3,029,877 $ 77,024 $ 3,029,877 $ 13,073 Foreign currency exchange forwards 411,292 4,909 398,890 4,836 272,636 4,226 264,653 4,048 Commodity contracts 87,547 12,486 83,214 11,155 255,089 20,528 255,165 19,624 Mortgage banking (a) 226,818 9,624 335,500 2,046 255,291 2,527 263,000 710 Gross derivatives before netting $ 219,537 $ 43,716 $ 104,305 $ 37,455 Less: Legally enforceable master netting agreements 1,936 1,936 10,410 10,410 Less: Cash collateral pledged/received 10,879 25,625 1,408 11,365 Total derivative instruments, after netting $ 206,722 $ 16,155 $ 92,487 $ 15,680 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. The Corporation terminated its $500 million fair value hedge during the fourth quarter of 2019. At December 31, 2020, the amortized cost basis of the closed portfolios which had previously been used in the terminated hedging relationship was $604 million and is included in loans and investment securities, AFS, at fair value on the consolidated balance sheets. This amount includes $3 million of hedging adjustments on the discontinued hedging relationships. The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income during the twelve months ended December 31, 2020 and 2019: Location and Amount of Gain or (Loss) Recognized on Consolidated Statements of Income in Fair Value and Cash Flow Hedging Relationships Year Ended December 31, 2020 Year Ended December 31, 2019 ($ in Thousands) 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 fair value or cash flow hedges are recorded (a) $ (1,779) $ — $ (448) $ — The effects of fair value and cash flow hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (1,779) — 5,871 — Derivatives designated as hedging instruments (a) — — (6,319) — (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 during the twelve months ended December 31, 2020 and 2019: Consolidated Statements of Income Category of For the Year Ended December 31, ($ in Thousands) 2020 2019 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital market fees, net $ (1,758) $ (1,393) Interest rate lock commitments (mortgage) Mortgage banking, net 7,097 319 Forward commitments (mortgage) Mortgage banking, net 1,335 1,362 Foreign currency exchange forwards Capital market fees, net (105) 132 Commodity contracts Capital market fees, net 427 (1,763)

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 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 with assets and liabilities offset resulting in a net position which is further offset by any cash collateral, and is reported in other assets and accrued expenses and other liabilities, on the face of the consolidated balance sheets. See Note 14 for additional information on the Corporation’s derivative and hedging activities. Securities Sold Under Agreement to Repurchase 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 therefore, are excluded from this table: Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Gross Amounts Recognized Derivative Liabilities Offset Cash Collateral Received Net Derivative assets December 31, 2020 $ 13,441 $ (1,936) $ (10,879) $ 626 $ — $ 626 December 31, 2019 11,864 (10,410) (1,408) 45 — 45 Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Gross Amounts Recognized Derivative Assets Offset Cash Collateral Pledged Net Derivative liabilities December 31, 2020 $ 27,951 $ (1,936) $ (25,625) $ 390 $ — $ 390 December 31, 2019 22,189 (10,410) (11,365) 413 — 413

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities	Note 16 Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings 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 14). The following is a summary of lending-related commitments: ($ in Thousands) 2020 2019 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 10,010,492 $ 9,024,412 Commercial letters of credit (a) 3,642 7,081 Standby letters of credit (c) 278,798 277,969 (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 December 31, 2020 or 2019. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14. (c) The Corporation has established a liability of $3 million at both December 31, 2020 and 2019 as an estimate of the fair value of these financial instruments. Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Year Ended December 31, 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 7,000 (2,500) Amount recorded at acquisition 179 70 Balance at end of period $ 47,776 $ 21,907 The increase in 2020 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 $7 million increase to the allowance for unfunded commitments primarily driven by the expected impact of the COVID-19 pandemic within the economic models used in the new expected credit loss methodology. See Note 1 and Note 4 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 is recorded on the consolidated balance sheets. The Corporation’s derivative and hedging activity is further described in Note 14. 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 December 31, 2020, was $272 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 $23 million, $19 million, and $17 million during the years ended December 31, 2020, 2019, and 2018, respectively. The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $268 million at December 31, 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 $118 million and $123 million at December 31, 2020 and 2019, respectively. During the years ended December 31, 2020, 2019 and 2018, the Corporation did not record any impairment related to qualified affordable housing investments. The Corporation has principal investment commitments to provide capital-based financing to private and public companies through either direct investment in specific companies or through investment funds and partnerships. The timing of future cash requirements to fund such principal investment commitments is generally dependent on the investment cycle, whereby privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, which can vary based on overall market conditions, as well as the nature and type of industry in which the companies operate. The Corporation also invests in loan pools that support CRA loans. The timing of future cash requirements to fund these pools is dependent upon loan demand, which can vary over time. The aggregate carrying value of these investments at December 31, 2020 was $25 million, compared to $26 million at December 31, 2019, included in tax credit and other investments on the consolidated balance sheets. Legal Proceedings The Corporation is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which involve claims for substantial amounts. Although there can be no assurance as to the ultimate outcomes, the Corporation believes it has meritorious defenses to the claims asserted against it in its currently outstanding matters and intends to continue to defend itself vigorously with respect to such legal proceedings. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of the Corporation and its shareholders. On at least a quarterly basis, the Corporation assesses its liabilities and contingencies in connection with all pending or threatened claims and litigation, utilizing the most recent information available. On a matter by matter basis, an accrual for loss is established for those matters which the Corporation believes it is probable that a loss may be incurred and that the amount of such loss can be reasonably estimated. Once established, each accrual is adjusted as appropriate to reflect any subsequent developments. Accordingly, management’s estimate will change from time to time, and actual losses may be more or less than the current estimate. For matters where a loss is not probable, or the amount of the loss cannot be estimated, no accrual is established. Resolution of legal claims is inherently unpredictable, and in many legal proceedings various factors exacerbate this inherent unpredictability, including where the damages sought are unsubstantiated or indeterminate, it is unclear whether a case brought as a class action will be allowed to proceed on that basis, discovery is not complete, the proceeding is not yet in its final stages, the matters present legal uncertainties, there are significant facts in dispute, there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants), or there is a wide range of potential results. A lawsuit, Evans et al v. Associated Banc-Corp et al , was filed in the United States District Court for the Eastern District of Wisconsin - Green Bay Division on January 13, 2021 by one current and one former participant in the Associated Banc-Corp 401(k) and Employee Stock Ownership Plan (the “Plan”) as representatives of a putative class. The plaintiffs allege that Associated Banc-Corp, the Associated Banc-Corp Plan Administrative Committee, and current and past members of such committee during the relevant time period (the “Defendants”) breached their fiduciary duties with respect to the Plan in violation of Employee Retirement Income Security Act of 1974, as amended, by applying an imprudent and inappropriate preference for products associated with Associated Banc-Corp within the Plan, and that the Defendants failed to monitor or control the recordkeeping expenses paid to Associated Trust Company, N.A. The plaintiffs, in part, seek an accounting and disgorgement of certain profits, as well as certain equitable restitution and equitable monetary relief. The Corporation intends to vigorously defend against this lawsuit. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time with respect to this lawsuit. Regulatory Matters A variety of consumer products, including mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters. Mortgage Repurchase Reserve The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under the Corporation's usual underwriting procedures, and are most often sold on a nonrecourse basis, primarily to the GSEs. The Corporation’s agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold, related to credit information, loan documentation, collateral, and insurability. Subsequent to being sold, if a material underwriting deficiency or documentation defect is discovered, the Corporation may be obligated to repurchase the loan or reimburse the GSEs for losses incurred (collectively, “make whole requests”). The make whole requests and any related risk of loss under the representations and warranties are largely driven by borrower performance. As a result of make whole requests, the Corporation has repurchased loans with principal balances of approximately $10 million and $2 million for years ended December 31, 2020 and 2019, respectively. There were no loss reimbursement and settlement claims paid for the year ended December 31, 2020, and for the year ended December 31, 2019, such claims were negligible. Make whole requests during 2019 and 2020 generally arose from loans sold during the period of January 1, 2012 to December 31, 2019. Since January 1, 2012, loans sold totaled $14.4 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of December 31, 2020, approximately $6.8 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 and approximately $795,000 at December 31, 2020 and 2019, respectively. 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 December 31, 2020 and December 31, 2019, there were approximately $36 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 December 31, 2020 and December 31, 2019, there were $33 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.

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Parent Company Only Financial Information	Parent Company Only Financial Information Presented below are condensed financial statements for the Parent Company: Balance Sheets December 31, ($ in Thousands) 2020 2019 Assets Cash and due from banks $ 40,204 $ 17,427 Interest-bearing deposits in other financial institutions 15,228 27,186 Notes and interest receivable from subsidiaries 305,779 201,551 Investments in and receivable due from subsidiaries 4,005,198 3,925,596 Other assets 46,850 46,234 Total assets $ 4,413,259 $ 4,217,994 Liabilities and Stockholders' Equity Commercial paper $ 59,346 $ 32,016 Subordinated notes, at par 250,000 250,000 Long-term funding capitalized costs (1,133) (1,428) Total long-term funding 248,867 248,572 Accrued expenses and other liabilities 14,113 15,282 Total liabilities 322,326 295,870 Preferred equity 353,512 256,716 Common equity 3,737,421 3,665,407 Total stockholders’ equity 4,090,933 3,922,124 Total liabilities and stockholders’ equity $ 4,413,259 $ 4,217,994 Statements of Income For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Income Income from subsidiaries $ 317,895 $ 341,789 $ 354,637 Interest income on notes receivable from subsidiaries 3,257 13,983 12,199 Other income 933 761 994 Total income 322,084 356,532 367,830 Expense Interest expense on short and long-term funding 10,960 16,802 18,355 Other expense 6,422 6,583 11,736 Total expense 17,383 23,384 30,091 Income before income tax expense 304,702 333,148 337,739 Income tax expense (benefit) (2,070) 6,359 4,176 Net income 306,771 326,790 333,562 Preferred stock dividends 18,358 15,202 10,784 Net income available to common equity $ 288,413 $ 311,587 $ 322,779 Statements of Cash Flows For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Cash Flows from Operating Activities Net income $ 306,771 $ 326,790 $ 333,562 Adjustments to reconcile net income to net cash provided by operating activities: (Increase) decrease in equity in undistributed net income (loss) of subsidiaries (61,406) (21,789) (18,636) Net change in other assets and accrued expenses and other liabilities (49,890) 265 (92,366) Net cash provided by operating activities 195,475 305,266 222,562 Cash Flows from Investing Activities Proceeds from sales of investment securities — — 827 Net (increase) decrease in notes receivable from subsidiaries (105,000) 250,000 (139,317) Net (increase) decrease in loans — — 2,210 Net cash provided by (used in) investing activities (105,000) 250,000 (136,280) Cash Flows from Financing Activities Net increase (decrease) in commercial paper 27,330 (13,406) (22,044) Redemption of Corporation's senior notes — (250,000) — Proceeds from issuance of common stock for stock-based compensation plans 3,966 11,216 18,408 Proceeds from issuance of preferred stock 96,796 — 97,315 Purchase of preferred stock — — (537) Common stock warrants exercised — — (1) Purchase of common stock returned to authorized but unissued — — (33,075) Issuance of treasury stock for acquisition — — 91,296 Purchase of treasury stock, open market purchases (71,255) (177,484) (206,450) Purchase of treasury stock, stock-based compensation plans (6,113) (8,592) (7,148) Cash dividends on common stock (112,023) (111,804) (105,519) Cash dividends on preferred stock (18,358) (15,202) (10,784) Net cash used in financing activities (79,656) (565,272) (178,540) Net increase (decrease) in cash and cash equivalents 10,819 (10,006) (92,258) Cash and cash equivalents at beginning of year 44,613 54,619 146,877 Cash and cash equivalents at end of year $ 55,432 $ 44,613 $ 54,619

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 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). See Note 1 for the Corporation’s accounting policy for fair value measurements. Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a recurring basis at fair value, including the general classification of such instruments pursuant to the valuation hierarchy. Assets and Liabilities Measured at Fair Value on a Recurring Basis Investment Securities AFS: Where quoted prices are available in an active market, investment securities are classified in Level 1 of the fair value hierarchy. If quoted market prices are not available for the specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. Lastly, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, securities are classified within Level 3 of the fair value hierarchy. To validate the fair value estimates, assumptions, and controls, the Corporation looks to transactions for similar instruments and utilizes independent pricing provided by third party vendors or brokers and relevant market indices. While none of these sources are solely indicative of fair value, they serve as directional indicators for the appropriateness of the Corporation’s fair value estimates. The Corporation has determined that the fair value measures of its investment securities are classified predominantly within Level 2 of the fair value hierarchy. See Note 3 for additional disclosure regarding the Corporation’s investment 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. Since quoted prices for the Corporation's equity securities are readily available in an active market, they are classified within Level 1 of the fair value hierarchy. See Note 3 for additional disclosure regarding the Corporation’s equity securities. Residential Loans Held For Sale: Residential loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are carried at estimated fair value. Management has elected the fair value option to account for all newly originated mortgage loans held for sale, which results in the financial impact of changing market conditions being reflected currently in earnings as opposed to being dependent upon the timing of sales. Therefore, the continually adjusted values better reflect the price the Corporation expects to receive from the sale of such loans. The estimated fair value is based on what secondary markets are currently offering for portfolios with similar characteristics, which the Corporation classifies as a Level 2 fair value measurement. Derivative Financial Instruments (Interest Rate-Related Instruments): The Corporation utilizes interest rate swaps to hedge exposure to interest rate risk and variability of fair value related to changes in the underlying interest rate of the hedged item. These hedged interest rate swaps are classified as fair value hedges. During the fourth quarter of 2019, the Corporation terminated the outstanding fair value hedges. See Note 14 for additional disclosure regarding the Corporation's fair value hedges. In addition, the Corporation offers interest rate-related instruments (swaps and caps) to service its customers’ needs, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror interest rate-related instruments) with third parties to manage its interest rate risk associated with these financial instruments. The valuation of the Corporation’s derivative financial instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 14 for additional disclosure regarding the Corporation’s interest rate-related instruments. The discounted cash flow analysis component in the fair value measurement reflects the contractual terms of the derivative financial instruments, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. More specifically, the fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) with the variable cash payments (or receipts) based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. Likewise, the fair values of interest rate options (i.e., interest rate caps) are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (or rise above) the strike rate of the floors (or caps), with the variable interest rates used in the calculation of projected receipts on the floor (or cap) based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. While the Corporation has determined that the majority of the inputs used to value its interest rate-related derivative financial instruments fall within Level 2 of the fair value hierarchy, the credit valuation adjustments utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions as of December 31, 2020 and 2019, and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments in their entirety are classified within Level 2 of the fair value hierarchy. Derivative Financial Instruments (Foreign Currency Exchange Forwards): The Corporation provides foreign currency exchange services to customers. In addition, the Corporation may enter into a foreign currency exchange forward to mitigate the exchange rate risk attached to the cash flows of a loan or as an offsetting contract to a forward entered into as a service to its customer. The valuation of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and is classified within Level 2 of the fair value hierarchy. See Note 14 for additional disclosures regarding the Corporation’s foreign currency exchange forwards. Derivative Financial Instruments (Commodity Contracts): The Corporation enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror commodity contracts) with third parties to manage its risk associated with these financial instruments. The valuation of the Corporation’s commodity contracts is determined using quoted prices of the underlying instruments, and also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 14 for additional disclosures regarding the Corporation’s commodity contracts. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings. While the Corporation has determined that the majority of the inputs used to value its derivative financial instruments fall within Level 2 of the fair value hierarchy, the credit valuation adjustments utilize Level 3 inputs, such as probability of default and loss given default of the underlying loans to evaluate the likelihood of default by itself and its counterparties. The Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions as of December 31, 2020 and 2019, and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments in their entirety are classified within Level 2 of the fair value hierarchy. The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of December 31, 2020 and 2019, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy December 31, 2020 December 31, 2019 Assets Investment securities AFS U.S. Treasury securities Level 1 $ 26,531 $ — Agency securities Level 2 25,038 — Obligations of state and political subdivisions (municipal securities) Level 2 450,662 546,160 Residential mortgage-related securities FNMA / FHLMC Level 2 1,461,241 132,660 GNMA Level 2 235,537 985,139 Commercial mortgage-related securities FNMA / FHLMC Level 2 22,904 21,728 GNMA Level 2 524,756 1,310,207 Asset backed securities FFELP Level 2 327,189 263,693 SBA Level 2 8,584 — Other debt securities Level 2 3,000 3,000 Total investment securities AFS Level 1 $ 26,531 $ — Total investment securities AFS Level 2 3,058,910 3,262,586 Equity securities with readily determinable fair values Level 1 1,661 1,646 Residential loans held for sale Level 2 129,158 136,280 Interest rate-related instruments (a) Level 2 192,518 77,024 Foreign currency exchange forwards (a) Level 2 4,909 4,226 Commodity contracts (a) Level 2 12,486 20,528 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 9,624 2,527 Liabilities Interest rate-related instruments (a) Level 2 $ 25,680 $ 13,073 Foreign currency exchange forwards (a) Level 2 4,836 4,048 Commodity contracts (a) Level 2 11,155 19,624 Forward commitments to sell residential mortgage loans Level 3 2,046 710 (a) Figures presented gross before netting. See Note 14 and Note 15 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 years ended December 31, 2020 and 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 $ 72,659 $ (3,505) $ 76,164 Closed loans / settlements (76,001) (12,587) (63,414) Other 10,439 17,427 (6,988) Mortgage derivative gain (loss) 7,097 1,335 5,762 Balance December 31, 2020 $ 9,624 $ 2,046 $ 7,579 For Level 3 assets and liabilities measured at fair value on a recurring basis as of December 31, 2020, the Corporation utilized the following valuation techniques and significant unobservable inputs: Derivative Financial Instruments (Mortgage Derivative — Interest Rate Lock Commitments to Originate Residential Mortgage Loans Held For Sale): The fair value is determined by the change in value from each loan's rate lock date to the expected rate lock expiration date based on the underlying loan attributes, estimated closing ratios, and investor price matrix determined to be reasonably applicable to each loan commitment. The closing ratio calculation takes into consideration historical experience and loan-level attributes, particularly the change in the current interest rates from the time of initial rate lock. The closing ratio is periodically reviewed for reasonableness and reported to the Associated Mortgage Risk Management Committee. At December 31, 2020, the closing ratio was 90%. Derivative Financial Instruments (Mortgage Derivative—Forward Commitments to Sell Mortgage Loans): Mortgage derivatives include forward commitments to deliver closed-end residential mortgage loans into conforming Agency MBS or conforming Cash Forward sales. The fair value of such instruments is determined by the difference of current market prices for such traded instruments or available from forward cash delivery commitments and the original traded price for such commitments. The Corporation also relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. While there are Level 2 and 3 inputs used in the valuation models, the Corporation has determined that the majority of the inputs significant in the valuation of both of the mortgage derivatives fall within Level 3 of the fair value hierarchy. See Note 14 for additional disclosure regarding the Corporation’s mortgage derivatives. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a nonrecurring basis at the lower of amortized cost or estimated fair value, including the general classification of such instruments pursuant to the valuation hierarchy. Commercial Loans Held For Sale: Commercial loans held for sale are carried at the lower of cost or estimated fair value. The estimated fair value is based on a discounted cash flow analysis, which the Corporation classifies as a Level 2 nonrecurring fair value measurement. OREO: Certain OREO, upon initial recognition, was re-measured and reported at fair value through a charge off to the allowance for loan losses based upon the estimated fair value of the OREO, less estimated selling costs. The fair value of OREO, upon initial recognition or subsequent impairment, was estimated using appraised values, which the Corporation classifies as a Level 2 nonrecurring fair value measurement. For Level 3 assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2020, the Corporation utilized the following valuation techniques and significant unobservable inputs. 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 4 for additional information regarding the Corporation’s individually evaluated loans. Mortgage Servicing Rights: MSRs do not trade in an active, open market with readily observable prices. While sales of MSRs do occur, the precise terms and conditions typically are not readily available to allow for a “quoted price for similar assets” comparison. Accordingly, the Corporation utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its MSRs. The valuation model incorporates prepayment assumptions to project MSRs cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the MSRs. The valuation model considers portfolio characteristics of the underlying mortgages, contractually specified servicing fees, prepayment assumptions, discount rate assumptions, delinquency rates, late charges, other ancillary revenue, costs to service, and other economic factors. The Corporation periodically reviews and assesses the underlying inputs and assumptions used in the model. In addition, the Corporation compares its fair value estimates and assumptions to observable market data for MSRs, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, MSRs are classified within Level 3 of the fair value hierarchy. The Corporation uses the amortization method (i.e., lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, for its MSRs assets. The discounted cash flow analyses that generate expected market prices utilize the observable characteristics of the MSRs portfolio, as well as certain unobservable valuation parameters. The significant unobservable inputs used in the fair value measurement of the Corporation’s MSRs are the weighted average constant prepayment rate and weighted average discount rate. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement. These parameter assumptions fall within a range that the Corporation, in consultation with an independent third party, believes purchasers of servicing would apply to such portfolios sold into the current secondary servicing market. Discussions are held with members from Treasury and the Community, Consumer, and Business segment to reconcile the fair value estimates and the key assumptions used by the respective parties in arriving at those estimates. The Associated Mortgage Risk Management Committee is responsible for providing control over the valuation methodology and key assumptions. To assess the reasonableness of the fair value measurement, the Corporation also compares the fair value and constant prepayment rate to a value calculated by an independent third party on an annual basis. See Note 5 for additional disclosure regarding the Corporation’s MSRs. Equity Securities Without Readily Determinable Fair Values: The Corporation measures equity securities without readily determinable fair values at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer, with such changes recognized in earnings. Included in equity securities without readily determinable fair values are 77,000 Visa Class B restricted shares carried at fair value. These shares are currently subject to certain transfer restrictions and will be convertible into Visa Class A shares upon final resolution of certain litigation matters involving Visa. During the first quarter of 2020, the Corporation also acquired 996 Visa Class B restricted shares from the acquisition of First Staunton, and those shares are currently carried at a zero cost basis due to the lack of an observable market price since the time of acquisition. Based on the current conversion factor, the Corporation expects 77,996 shares of Visa Class B to convert to 126,572 shares of Visa Class A upon the litigation resolution. In its determination of the new carrying values upon observable price changes, the Corporation will adjust the prices if deemed necessary to arrive at the Corporation's estimated fair values. Such adjustments may include adjustments to reflect the different rights and obligations of similar securities and other adjustments. See Note 3 for additional disclosure regarding the Corporation’s equity securities without readily determinable fair values. The following table presents the carrying value of equity securities without readily determinable fair values still held as of December 31, 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 December 31, 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 December 31, 2020 $ 13,444 Cumulative upward carrying value changes between January 1, 2018 and December 31, 2020 $ 13,444 Cumulative downward carrying value changes between January 1, 2018 and December 31, 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: ($ in Thousands) Fair Value Hierarchy Fair Value Consolidated Statements of Income Category of Adjustment Recognized on the Consolidated Statements of Income December 31, 2020 Assets Individually evaluated loans (a) Level 3 $ 138,752 Provision for credit losses $ (97,519) OREO (b) Level 2 6,125 Other noninterest expense (3,747) Mortgage servicing rights Level 3 41,990 Mortgage banking, net (17,704) 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 credit 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: December 31, 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 8% - 47% 20% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 0% - 40% 34% 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: December 31, 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 $ 416,154 $ 416,154 $ 373,380 $ 373,380 Interest-bearing deposits in other financial institutions Level 1 298,759 298,759 207,624 207,624 Federal funds sold and securities purchased under agreements to resell Level 1 1,135 1,135 7,740 7,740 Investment securities HTM, net Level 1 999 1,024 999 1,018 Investment securities HTM, net Level 2 1,877,939 2,027,852 2,204,084 2,275,447 Investment securities AFS Level 1 26,531 26,531 — — Investment securities AFS Level 2 3,058,910 3,058,910 3,262,586 3,262,586 Equity securities with readily determinable fair values Level 1 1,661 1,661 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 2 129,158 129,158 136,280 136,280 Commercial loans held for sale Level 2 — — 15,000 15,000 Loans, net Level 3 24,068,022 24,012,738 22,620,068 22,399,621 Bank and corporate owned life insurance Level 2 679,647 679,647 671,948 671,948 Derivatives (other assets) (a) Level 2 209,913 209,913 101,778 101,778 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 9,624 9,624 2,527 2,527 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 24,725,451 $ 24,725,451 $ 21,156,261 $ 21,156,261 Brokered CDs and other time deposits (b) Level 2 1,757,030 1,766,200 2,622,803 2,622,803 Short-term funding (c) Level 2 252,317 252,303 465,113 465,113 FHLB advances Level 2 1,632,723 1,760,727 3,180,967 3,207,793 Other long-term funding Level 2 549,465 578,233 549,343 572,873 Standby letters of credit (d) Level 2 2,731 2,731 2,710 2,710 Derivatives (accrued expenses and other liabilities) (a) Level 2 41,671 41,671 36,745 36,745 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 2,046 2,046 710 710 (a) Figures presented gross before netting. See Note 14 and Note 15 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 $279 million and $278 million at December 31, 2020 and 2019, respectively. See Note 16 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]
Regulatory Matters	Regulatory Matters Regulatory Capital Requirements The Corporation and its subsidiary bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possible additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Corporation’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Corporation must meet specific capital guidelines that involve quantitative measures of the Corporation’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Corporation’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Corporation to maintain minimum amounts and ratios (set forth in the table below) of total and CET1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of tier 1 capital (as defined) to average assets (as defined). Management believes, as of December 31, 2020 and 2019, that the Corporation meets all capital adequacy requirements to which it is subject. For additional information on the capital requirements applicable for the Corporation and the Bank, please see Part I, Item 1. As of December 31, 2020 and 2019, the most recent notifications from the OCC and the FDIC categorized the subsidiary bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the subsidiary bank must maintain minimum ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the institution’s category. The actual capital amounts and ratios of the Corporation and its significant subsidiary are presented below. No deductions from capital were made for interest rate risk in 2020 or 2019. Actual For Capital Adequacy To Be Well Capitalized Under Prompt Corrective Action Provisions (a) ($ in Thousands) Amount Ratio (a) Amount Ratio Amount Ratio As of December 31 , 2020 Associated Banc-Corp Total capital $ 3,632,807 14.02 % $ 2,072,273 ≥ 8.00 % Tier 1 capital 3,058,809 11.81 % 1,554,205 ≥ 6.00 % Common equity Tier 1 capital 2,706,010 10.45 % 1,165,654 ≥ 4.50 % Leverage 3,058,809 9.37 % 1,305,604 ≥ 4.00 % Associated Bank, N.A. Total capital $ 3,295,823 12.74 % $ 2,068,801 ≥ 8.00 % $ 2,586,002 ≥ 10.00 % Tier 1 capital 2,971,234 11.49 % 1,551,601 ≥ 6.00 % 2,068,801 ≥ 8.00 % Common equity Tier 1 capital 2,971,234 11.49 % 1,163,701 ≥ 4.50 % 1,680,901 ≥ 6.50 % Leverage 2,971,234 9.11 % 1,304,448 ≥ 4.00 % 1,630,560 ≥ 5.00 % As of December 31 , 2019 Associated Banc-Corp Total capital $ 3,208,625 13.21 % $ 1,943,711 ≥ 8.00 % Tier 1 capital 2,736,776 11.26 % 1,457,783 ≥ 6.00 % Common equity Tier 1 capital 2,480,698 10.21 % 1,093,337 ≥ 4.50 % Leverage 2,736,776 8.83 % 1,239,431 ≥ 4.00 % Associated Bank, N.A. Total capital $ 2,892,650 11.95 % $ 1,936,732 ≥ 8.00 % $ 2,420,915 ≥ 10.00 % Tier 1 capital 2,669,372 11.03 % 1,452,549 ≥ 6.00 % 1,936,732 ≥ 8.00 % Common equity Tier 1 capital 2,469,578 10.20 % 1,089,412 ≥ 4.50 % 1,573,595 ≥ 6.50 % Leverage 2,669,372 8.63 % 1,236,565 ≥ 4.00 % 1,545,706 ≥ 5.00 % (a) Prompt corrective action provisions are not applicable at the bank holding company level.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share See Note 1 for the Corporation’s accounting policy on earnings per common share. Presented below are the calculations for basic and diluted earnings per common share: For the Years Ended December 31, ($ in Thousands, except per share data) 2020 2019 2018 Net income $ 306,771 $ 326,790 $ 333,562 Preferred stock dividends (18,358) (15,202) (10,784) Net income available to common equity 288,413 311,587 322,779 Common shareholder dividends (111,291) (111,091) (104,981) Unvested share-based payment awards (732) (713) (537) Undistributed earnings 176,390 199,784 217,260 Undistributed earnings allocated to common shareholders 175,134 198,424 216,199 Undistributed earnings allocated to unvested share-based payment awards 1,256 1,360 1,060 Undistributed earnings $ 176,390 $ 199,784 $ 217,260 Basic Distributed earnings to common shareholders $ 111,291 $ 111,091 $ 104,981 Undistributed earnings allocated to common shareholders 175,134 198,424 216,199 Total common shareholders earnings, basic $ 286,425 $ 309,514 $ 321,181 Diluted Distributed earnings to common shareholders $ 111,291 $ 111,091 $ 104,981 Undistributed earnings allocated to common shareholders 175,134 198,424 216,199 Total common shareholders earnings, diluted $ 286,425 $ 309,514 $ 321,181 Weighted average common shares outstanding $ 153,005 $ 160,534 $ 167,345 Effect of dilutive common stock awards 637 1,398 1,985 Effect of dilutive common stock warrants — — 402 Diluted weighted average common shares outstanding $ 153,642 $ 161,932 $ 169,732 Basic earnings per common share $ 1.87 $ 1.93 $ 1.92 Diluted earnings per common share $ 1.86 $ 1.91 $ 1.89

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Reporting	Note 21 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 Note 1, 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 tax, 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 NII using an internal FTP methodology that charges users of funds (assets) and credits providers of funds (liabilities, primarily deposits) based on the maturity, prepayment, and / or re-pricing characteristics of the assets and liabilities. The net effect of this allocation is offset in the Risk Management and Shared Services segment to ensure the consolidated totals reflect the Corporation's NII. The net FTP allocation is reflected as net intersegment interest 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 ACLL model using methodologies described in Note 1. 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 acquisition-related costs, asset gains on disposed business units, loss on the prepayment of FHLB advances, and income tax benefits as a result of corporate restructuring) 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 with the net tax residual recorded in Risk Management and Shared Services. 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 description of each business segment is presented below. Corporate and Commercial Specialty: The Corporate and Commercial Specialty segment serves a wide range of customers including private clients, 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, private clients, and small to mid-sized businesses. In serving this segment, we compete based on an in-depth understanding of our customers’ financial needs, the ability to match market competitive solutions to those needs, and the highest standards of relationship and service excellence in the delivery of these services. Delivery of services is provided through our corporate and commercial units, our CRE unit, as well as our specialized industries and commercial financial services units. Within this segment we provide the following products and services: (1) lending solutions, such as commercial loans and lines of credit, CRE financing, construction loans, letters of credit, leasing, asset based lending, and, for our larger clients, loan syndications; (2) deposit and cash management solutions such as commercial checking and interest-bearing deposit products, cash vault and night depository services, liquidity solutions, payables and receivables solutions, and information services; (3) specialized financial services such as interest rate risk management, foreign exchange solutions, and commodity hedging; (4) fiduciary services such as administration of pension, profit-sharing and other employee benefit plans, fiduciary and corporate agency services, and institutional asset management; and (5) investable funds solutions such as savings, money market deposit accounts, IRA accounts, certificates of deposit, fixed and variable annuities, full-service, discount and online investment brokerage; investment advisory services; trust and investment management accounts. Community, Consumer, and Business: 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, until the sale of the business in June of 2020. In serving this segment, we compete based on providing a broad range of solutions to meet the needs of our customers in their entire financial lifecycle, convenient access to our services through multiple channels such as branches, phone based services, online and mobile banking, and a relationship based business model which assists our customers in navigating any changes and challenges in their financial circumstances. Delivery of services is provided through our various consumer banking and community banking units. Within this segment we provide the following products and services: (1) lending solutions such as residential mortgages, home equity loans and lines of credit, personal and installment loans, business loans, and business lines of credit, and (2) deposit and transactional solutions such as checking, credit, debit and pre-paid cards, online banking and bill pay, and money transfer services. Risk Management and Shared Services: The Risk Management and Shared Services segment includes key shared operational functions and also includes residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (FTP mismatches) and credit risk and provision residuals (long-term credit charge mismatches). All First Staunton, Huntington branch, and Bank Mutual acquisition related costs, the asset gain on sale of ABRC, loss on the prepayment of FHLB advances, and the tax benefit from corporate restructuring are included within the Risk Management and Shared Services segment. During 2020, the following restructurings occurred which resulted in the prior period segment results being revised for comparability: • The Corporation reorganized their investment and fiduciary businesses from the Community, Consumer and Business segment to the Corporate and Commercial Specialty segment. As a result of the reorganization, the Corporation reassigned goodwill of approximately $4 million attributable to the Corporation's acquisition of Whitnell & Co. in 2017. • The Corporation reorganized their marketing business unit from the Risk Management and Shared Services segment to the Community, Consumer and Business segment. • The Corporation reorganized their retirement plan services business unit from the Community, Consumer, and Business segment to the Corporate and Commercial Specialty segment. • The Corporation reorganized their oil and gas business unit from the Corporate and Commercial Specialty segment to the Risk Management and Shared Services segment. • The Corporation reorganized their trust investment support services team from the Risk Management and Shared Services segment to the Corporate and Commercial Specialty segment. This transition occurred to better align the wealth support teams with the business units that were already a part of the Corporate and Commercial Specialty segment. Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 395,135 $ 447,979 $ 458,240 Net intersegment interest income (expense) 10,400 (52,200) (33,519) Segment net interest income 405,535 395,779 424,721 Noninterest income 149,456 136,097 132,071 Total revenue 554,991 531,876 556,793 Provision for credit losses 59,780 49,341 42,234 Noninterest expense 209,507 233,655 233,202 Income (loss) before income taxes 285,705 248,879 281,356 Income tax expense (benefit) 53,193 47,480 54,732 Net income $ 232,512 $ 201,399 $ 226,625 Allocated goodwill $ 530,144 $ 530,144 $ 528,832 Community, Consumer, and Business For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 295,297 $ 301,563 $ 322,020 Net intersegment interest income (expense) 54,203 93,331 76,876 Segment net interest income 349,500 394,894 398,896 Noninterest income 185,737 223,712 212,711 Total revenue 535,237 618,606 611,607 Provision for credit losses 21,862 18,594 18,500 Noninterest expense 429,447 467,086 463,187 Income (loss) before income taxes 83,928 132,925 129,920 Income tax expense (benefit) 17,625 27,914 27,283 Net income $ 66,303 $ 105,011 $ 102,637 Allocated goodwill $ 579,156 $ 646,086 $ 640,191 Risk Management and Shared Services For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 72,525 $ 86,132 $ 99,320 Net intersegment interest income (expense) (64,603) (41,130) (43,357) Segment net interest income 7,922 45,001 55,963 Noninterest income (a) 178,862 21,015 10,785 Total revenue 186,784 66,017 66,748 Provision for credit losses 92,365 (51,935) (60,734) Noninterest expense (b) 137,080 93,247 125,410 Income (loss) before income taxes (42,661) 24,705 2,073 Income tax expense (benefit) (c) (50,618) 4,325 (2,228) Net income $ 7,957 $ 20,379 $ 4,301 Allocated goodwill $ — $ — $ — Consolidated Total For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 762,957 $ 835,674 $ 879,580 Net intersegment interest income (expense) — — — Segment net interest income 762,957 835,674 879,580 Noninterest income (a) 514,056 380,824 355,568 Total revenue 1,277,012 1,216,498 1,235,148 Provision for credit losses 174,006 16,000 — Noninterest expense (b) 776,034 793,988 821,799 Income (loss) before income taxes 326,972 406,509 413,349 Income tax expense (benefit) (c) 20,200 79,720 79,786 Net income $ 306,771 $ 326,790 $ 333,562 Allocated goodwill $ 1,109,300 $ 1,176,230 $ 1,169,023 (a) For the year ended December 31, 2020, the Corporation recognized a $163 million asset gain related to the sale of ABRC. 2019 includes less than $1 million of Huntington related asset losses and 2018 includes approximately $2 million of Bank Mutual acquisition related asset losses net of asset gains. (b) For the year ended December 31, 2020, 2019, 2018 and the Risk Management and Shared Services segment includes approximately $2 million, $7 million, and $29 million of acquisition related costs, respectively. (c) The Corporation has recognized $63 million in tax benefits for the year ended December 31, 2020.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2020, 2019, and 2018 respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Defined Benefit Accumulated Balance, December 31, 2017 $ (38,453) $ (24,305) $ (62,758) Other comprehensive income (loss) before reclassifications (39,891) (28,612) (68,503) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net 1,985 — 1,985 Personnel expense — (148) (148) Other expense — 2,203 2,203 Interest income (572) — (572) Adjustment for adoption of ASU 2016-01 (84) — (84) Adjustment for adoption of ASU 2018-02 (8,419) (5,235) (13,654) Income tax (expense) benefit 9,791 6,767 16,558 Net other comprehensive income (loss) during period (37,189) (25,025) (62,214) Balance, December 31, 2018 $ (75,643) $ (49,330) $ (124,972) Other comprehensive income (loss) before reclassifications $ 111,592 $ 16,296 $ 127,887 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (5,957) — (5,957) Personnel expense — (148) (148) Other expense — 476 476 Interest income 895 — 895 Income tax (expense) benefit (26,898) (4,465) (31,363) Net other comprehensive income (loss) during period 79,631 12,158 91,789 Balance, December 31, 2019 $ 3,989 $ (37,172) $ (33,183) Other comprehensive income (loss) before reclassifications $ 55,628 $ 7,780 $ 63,408 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (9,222) — (9,222) Personnel expense — (148) (148) Other expense — 3,897 3,897 Interest income 3,359 — 3,359 Income tax (expense) benefit (12,429) (3,064) (15,493) Net other comprehensive income (loss) during period 37,336 8,465 45,801 Balance, December 31, 2020 $ 41,325 $ (28,707) $ 12,618

Revenues (Notes)

Revenues (Notes)	12 Months Ended
	Dec. 31, 2020
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	Note 23 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 For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ 83,570 $ 80,719 $ 79,685 Service charges and deposit account fees 16,903 13,342 15,424 Card-based fees (b) 1,534 1,827 1,796 Insurance commissions and fees 208 364 349 Other revenue 3,462 1,647 997 Noninterest Income (in-scope of Topic 606) $ 105,678 $ 97,899 $ 98,251 Noninterest Income (out-of-scope of Topic 606) 43,778 38,198 33,820 Total Noninterest Income $ 149,456 $ 136,097 $ 132,071 Community, Consumer, and Business For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ 1,387 $ 2,838 $ 2,655 Service charges and deposit account fees 39,371 49,744 50,582 Card-based fees (b) 36,937 37,895 37,977 Insurance commissions and fees 45,027 88,727 89,123 Other revenue 19,053 9,462 9,887 Noninterest Income (in-scope of Topic 606) $ 141,775 $ 188,666 $ 190,225 Noninterest Income (out-of-scope of Topic 606) 43,962 35,046 22,486 Total Noninterest Income $ 185,737 $ 223,712 $ 212,711 Risk Management and Share Services For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ — $ (90) $ 222 Service charges and deposit account fees 33 49 69 Card-based fees (b) 134 190 37 Insurance commissions and fees 10 13 39 Other revenue (1,552) 1,370 1,242 Noninterest Income (in-scope of Topic 606) $ (1,375) $ 1,532 $ 1,609 Noninterest Income (out-of-scope of Topic 606) (c) 180,237 19,483 9,176 Total Noninterest Income $ 178,862 $ 21,015 $ 10,785 Consolidated Total For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ 84,957 $ 83,467 $ 82,562 Service charges and deposit account fees 56,307 63,135 66,075 Card-based fees (b) 38,605 39,912 39,810 Insurance commissions and fees 45,245 89,104 89,511 Other revenue 20,963 12,629 12,126 Noninterest Income (in-scope of Topic 606) $ 246,077 $ 288,247 $ 290,084 Noninterest Income (out-of-scope of Topic 606) (c) 267,979 92,577 65,484 Total Noninterest Income $ 514,056 $ 380,824 $ 355,568 (a) Includes trust, asset management, brokerage, and annuity fees. (b) Certain card-based fees are out-of-scope of Topic 606. (c) The year ended December 31, 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 on deposit accounts 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 on deposit accounts is primarily received immediately or in the following month through a direct charge to the customers’ accounts. Card-based fees (a) Card-based fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month. Trust and asset management fees (b) Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to the customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and advisory fees (b) Brokerage and advisory fees primarily consists of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage and advisory fees are included in wealth management fees. 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.

Recent Developments Recent Deve

Recent Developments Recent Developments Details (Notes)	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Recent Developments	Note 24 Recent Developments On January 5, 2021, Associated entered into an agreement to sell its wealth management subsidiary Whitnell to Rockefeller and form a strategic partnership with Rockefeller. At January 31, 2021, Whitnell had over $1.5 billion in assets under management, assets under advisement, and assets reported on and approximately 25 employees. The transaction is expected to close during March 2021. On January 21, 2021, the Corporation announced that President and CEO Philip B. Flynn had informed the Board of Directors of his plans to retire at the end of 2021. The Board has commenced a search for a permanent successor under the oversight of the Succession Planning Committee of the Board and with the assistance of Diversified Search Group. Mr. Flynn will continue as President and CEO until a successor is in place, at which time he will step down from both roles and from the Board of Directors. Mr. Flynn will continue to be available to the new CEO in an advisory capacity and as an ambassador for the Bank. In the first quarter of 2021, the Corporation resumed its share repurchase program which had been suspended in March 2020 due to the economic fallout of the COVID-19 pandemic. On February 2, 2021, the Corporation's Board of Directors declared a regular quarterly cash dividend of $0.18 per common share, payable on March 15, 2021 to shareholders of record at the close of business on March 1, 2021. The Board of Directors also declared a regular quarterly cash dividend of $0.3828125 per depositary share on Associated's 6.125% Series C Perpetual Preferred Stock, payable on March 15, 2021 to shareholders of record at the close of business on March 1, 2021. The Board of Directors also declared a regular quarterly cash dividend of $0.3359375 per depositary share on Associated's 5.375% Series D Perpetual Preferred Stock, payable on March 15, 2021 to shareholders of record at the close of business on March 1, 2021. The Board of Directors also declared a regular quarterly cash dividend of $0.3671875 per depositary share on Associated's 5.875% Series E Perpetual Preferred Stock, payable on March 15, 2021 to shareholders of record at the close of business on March 1, 2021. The Board of Directors also declared a regular quarterly cash dividend of $0.3515625 per depositary share on Associated's 5.625% Series F Perpetual Preferred Stock, payable on March 15, 2021 to shareholders of record at the close of business on March 1, 2021.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Business and Basis of Financial Statement Presentation	Business Associated Banc-Corp is a bank holding company headquartered in Wisconsin. The Corporation provides a full range of banking and related financial services to consumer and commercial customers through its network of bank and nonbank subsidiaries. The Corporation is subject to competition from other financial and non-financial institutions that offer similar or competing products and services. The Corporation is regulated by federal and state agencies and is subject to periodic examinations by those agencies. Basis of Financial Statement Presentation The consolidated financial statements include the accounts of the Parent Company and its subsidiaries. Investments in unconsolidated entities (none of which are considered to be variable interest entities in which the Corporation is the primary beneficiary) are accounted for using the cost method of accounting when the Corporation has determined that the cost method is appropriate. Investments not meeting the criteria for cost method accounting are accounted for using the equity method of accounting. Investments in unconsolidated entities are included in tax credit and other investments on the consolidated balance sheets, and the Corporation’s share of income or loss is recorded in other noninterest income, while distributions in excess of the investment are recorded in asset gains (losses), net. All significant intercompany balances and transactions have been eliminated in consolidation. 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.
Business Combinations	Business Combinations The Corporation accounts for its acquisitions using the purchase accounting method. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets acquired and liabilities assumed, including certain intangible assets that must be recognized. Typically, this allocation results in the purchase price exceeding the fair value of net assets acquired, which is recorded as goodwill. CDIs are a measure of the value of checking, money market and savings deposits acquired in business combinations accounted for under the purchase method. CDIs and other identified intangibles with finite useful lives are amortized using the straight line method over their estimated useful lives of up to ten years. Fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. For PCD loans, the credit discount includes estimated future credit losses expected over the life of the loan. The credit discount is recorded through a gross up of the allowance for loan loss and the corresponding loan. Adjustments to the allowance for loan losses are made through the provision for credit losses after the date of acquisition. Purchased performing loans are recorded at fair value, including credit, interest, and liquidity discounts. The fair value discount is accreted as an adjustment to yield over the estimated lives of the loans. There is no allowance for loan losses established at the acquisition date for purchased performing loans. A provision for credit losses is recorded at the time of acquisition for purchased non-PCD loans. See Note 2 for additional information on the Corporation's acquisitions.
Investment Securities	Investment Securities Securities are classified as HTM, AFS, or equity on the consolidated balance sheets at the time of purchase. Investment securities classified as HTM, which management has the positive intent and ability to hold to maturity, are reported at amortized cost. Investment securities classified as AFS, which management has the intent and ability to hold for an indefinite period of time, but not necessarily to maturity, are carried at fair value, with unrealized gains and losses, net of related deferred income taxes, included in stockholders’ equity as a separate component of OCI. Investment securities classified as equity securities are carried at fair value with changes in fair value immediately reflected in the consolidated statements of income. Any decision to sell investment securities AFS would be based on various factors, including, but not limited to, asset / liability management strategies, changes in interest rates or prepayment risks, liquidity needs, or regulatory capital considerations. Realized gains or losses on investment security sales (using specific identification method) are included in investment securities gains (losses), net, on the consolidated statements of income. Premiums and discounts are amortized or accreted into interest income over the estimated life (earlier of call date, maturity, or estimated life) of the related security, using a prospective method that approximates level yield. In certain situations, management may elect to transfer certain investment securities from the AFS classification to the HTM classification. In such cases, the investment securities are reclassified at fair value at the time of transfer. Any unrealized gain or loss included in accumulated other comprehensive income (loss) at the time of transfer is retained therein and amortized over the remaining life of the investment security as an adjustment to yield. Management measures expected credit losses on HTM securities on a collective basis by major security type. Accrued interest receivable on HTM 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 HTM, net, at amortized cost on the consolidated balance sheets For AFS 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 OCI. 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 AFS security is uncollectible or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on AFS debt securities is excluded from the estimate of credit losses. See Note 3 for additional information on investment securities.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank Stocks	FHLB and Federal Reserve Bank Stocks The Corporation is required to maintain Federal Reserve 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. See Note 3 for additional information on the FHLB and Federal Reserve Bank Stocks.
Loans Held for Sale	Loans Held for Sale Residential Loans Held for Sale: Residential loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are carried at estimated fair value. As a result of holding these loans at fair value, changes in the secondary market are reflected in earnings immediately, as opposed to being dependent upon the timing of sales. The estimated fair value is based on what secondary markets are currently offering for portfolios with similar characteristics. Commercial Loans Held for Sale: Commercial loans held for sale are carried at the lower of cost or estimated fair value. The estimated fair value is based on a discounted cash flow analysis.
Loans	Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances, net of any deferred fees and costs on originated loans. Origination fee income received on loans and amounts representing the estimated direct costs of origination are deferred and amortized to interest income over the life of the loan using the effective interest method. An ACLL is established for estimated credit losses in the loan portfolio. See Allowance for Credit Losses below for further policy discussion. See Note 4 for additional information on loans. Nonaccrual Loans: Management considers a loan to be nonaccrual when it believes it will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Interest income on loans is based on the principal balance outstanding computed using the effective interest method. The accrual of interest income for commercial loans is discontinued when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, while the accrual of interest income for consumer loans is discontinued when loans reach specific delinquency levels. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on a nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal. While a loan is in nonaccrual status, some or all of the cash interest payments received may be treated as interest income on a cash basis as long as the remaining recorded investment in the loan (i.e., after charge off of identified losses, if any) is deemed to be fully collectible. The determination as to the ultimate collectability of the loan's remaining recorded investment must be supported by a current, well documented credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months. See Note 4 for additional information on loans.
Troubled Debt Restructurings (Restructured Loans)	Troubled Debt Restructurings (“Restructured Loans”) : Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. In addition, all accruing restructured loans are reported as TDRs, which are individually analyzed by management. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. See Note 4 for additional information on restructured loans.
Allowance for Loan Losses	Allowance for Credit Losses on Loans: The allowance for loan losses is a reserve for estimated 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 estimate of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flow of these loans. Actual credit losses, net of recoveries, are deducted from the allowance for loan losses. A provision for credit losses, which is a charge against earnings, is recorded to bring the allowance for loan losses to a level that, in management’s judgment, is appropriate to absorb the expected lifetime losses in the loan portfolio. The methodology applied by the Corporation is designed to assess the appropriateness of the allowance for loan losses within the Corporation's loan segmentation. The methodology also 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 and property types in CRE for commercial loans and loan types for consumer loans, consideration of historical loan 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 credit 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 inputs, see Note 4. The Corporation estimates the lifetime expected loss using prepayment assumptions over the projected lifetime cash flows of the loan. Because each of the criteria used is subject to change, the analysis of the allowance for loan losses is not necessarily indicative of the trend of future loan losses in any particular loan category. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio. 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 ACLL attributable to the loan is allocated based on management’s estimate of the borrower’s ability to repay the loan given the availability of collateral, other sources of cash flows, as well as evaluation of legal options available to the Corporation. The amount of expected loan loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the fair value of the underlying collateral less applicable selling costs, or the observable market price of the loan. If foreclosure is probable or the loan is collateral dependent, impairment is measured using the fair value of the loan’s collateral, less costs to sell. Large groups of homogeneous loans, such as residential mortgage, home equity, and other consumer, are collectively evaluated for impairment. 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 4 for additional information on the ACLL and Note 16 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. Management believes that the level of the ACLL is appropriate. While management uses currently available information to recognize losses on loans, future adjustments to the ACLL may be necessary based on newly received appraisals, updated commercial customer financial statements, rapidly deteriorating cash flow, and changes in economic conditions that affect our customers. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Corporation’s ACLL. Such agencies may require additions to the ACLL or may require that certain loan balances be charged off or downgraded into criticized loan categories when their credit evaluations differ from those of management based on their judgments about information available to them at the time of their examinations. See Loans above for further policy discussion and see Note 4 for additional information on the allowance for loan losses.
Other Real Estate Owned	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.
Premises and Equipment and Software	Premises and Equipment and Software Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed on the straight-line method over the estimated useful lives of the related assets or the lease term. Maintenance and repairs are charged to expense as incurred, while additions or major improvements are capitalized and depreciated over the estimated useful lives. Leasehold improvements are amortized on a straight-line basis over the lesser of the lease terms, including extension options which the Corporation has determined are reasonably certain to be exercised, or the estimated useful lives of the improvements. Software, included in other assets on the consolidated balance sheets, is amortized on a straight-line basis over the lesser of the contract terms or the estimated useful life of the software. See Note 6 for additional information on premises and equipment.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill and Other Intangible Assets: The excess of the cost of an acquisition over the fair value of the net assets acquired consists primarily of goodwill, CDIs, and other identifiable intangibles (primarily related to customer relationships acquired). CDIs have estimated finite lives and are amortized on a straight-line basis to expense over a 10-year period. The other intangibles have estimated finite lives and are amortized on a straight-line basis over their expected useful life. The Corporation reviews long-lived assets and certain identifiable intangibles for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, in which case an impairment charge would be recorded. Goodwill is not amortized but, instead, is 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 impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired. If the carrying value of a reporting unit exceeds its calculated fair value, an impairment charge is assessed, limited to the amount of goodwill allocated to that reporting unit. See Note 5 for additional information on goodwill and other intangible assets.
Mortgage Servicing Rights	Mortgage Servicing Rights : The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Upon sale, a MSRs asset is capitalized, which represents the then current fair value of future net cash flows expected to be realized for performing servicing activities. MSRs, when purchased, are initially recorded at fair value. As the Corporation has not elected to subsequently measure any class of servicing assets under the fair value measurement method, the Corporation follows the amortization method. MSRs are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date. MSRs are carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value, on the consolidated balance sheets. The Corporation periodically evaluates its MSRs asset for impairment. 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. 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 5 for additional information on MSRs.
Income Taxes	Income Taxes Amounts provided for income tax expense are based on income reported for financial statement purposes and do not necessarily represent amounts currently payable under tax laws. Deferred income taxes, which arise principally from temporary differences between the amounts reported in the financial statements and the tax bases of assets and liabilities, are included in the amounts provided for income taxes. In assessing the realizability of DTAs, management considers whether it is more likely than not that some portion or all of the DTAs will not be realized. The ultimate realization of DTAs is dependent upon the generation of future taxable income and tax planning strategies which will create taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, the amount of taxes paid in available carryback years, projected future taxable income, and, if necessary, tax planning strategies in making this assessment. The Corporation files a consolidated federal income tax return and separate or combined state income tax returns. Accordingly, amounts equal to tax benefits of those subsidiaries having taxable federal or state losses or credits are offset by other subsidiaries that incur federal or state tax liabilities. It is the Corporation’s policy to provide for uncertainty in income taxes as a part of income tax expense based upon management’s assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. At December 31, 2020 and 2019, the Corporation believes it has appropriately accounted for any unrecognized tax benefits. To the extent the Corporation prevails in matters for which a liability for an unrecognized tax benefit was established or is required to pay amounts in excess of the liability established, the Corporation’s effective tax rate in a given financial statement period may be impacted. See Note 13 for additional information on income taxes.
Derivative and Hedging Activities	Derivative and Hedging Activities Derivative instruments, including derivative instruments embedded in other contracts, are carried at fair value on the consolidated balance sheets with changes in the fair value recorded to earnings or accumulated other comprehensive income, as appropriate. On the date the derivative contract is entered into, the Corporation designates the derivative as a fair value hedge (i.e., a hedge of the fair value of a recognized asset or liability), a cash flow hedge (i.e., a hedge of the variability of cash flows to be received or paid related to a recognized asset or liability), or a free-standing derivative instrument. For a derivative designated as a fair value hedge, the changes in the fair value of the derivative instrument and the changes in the fair value of the hedged asset or liability are recognized in current period earnings as an increase or decrease to the carrying value of the hedged item on the balance sheet and in the related income statement account. Amounts within accumulated other comprehensive income are reclassified into earnings in the period the hedged item affects earnings. For a derivative designated as a free-standing derivative instrument, changes in fair value are reported in current period earnings. The free-standing derivative instruments included: interest rate risk management, commodity hedging, and foreign currency exchange solutions. The Corporation is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. If a counterparty fails to perform, our counterparty credit risk is equal to the amount reported as a derivative asset on our balance sheet. The Corporation uses master netting arrangements to mitigate counterparty credit risk in derivative transactions. To the extent the derivatives are subject to master netting arrangements, the Corporation takes into account the impact of master netting arrangements that allow the Corporation to settle all derivative contracts executed with the same counterparty on a net basis, and to offset the net derivative position with the related cash collateral. 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. See Note 14 for additional information on derivatives and hedging activities.
Securities Sold Under Agreement to Repurchase	Securities Sold Under Agreement to Repurchase The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings 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) 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 obligation to repurchase the securities is reflected as a liability within federal funds purchased and securities sold under agreements to repurchase on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts. See Notes 9 and 15 for additional information on repurchase agreements.
Retirement Plan	Retirement Plans The funded status of the retirement plans is recognized as an asset or liability on the consolidated balance sheets and changes in that funded status are recognized in the year in which the changes occur through OCI. Plan assets and benefit obligations are measured as of fiscal year end. The measurement of the projected benefit obligation and pension expense involve actuarial valuation methods and the use of various actuarial and economic assumptions. The Corporation monitors the assumptions and updates them periodically. Due to the long-term nature of the pension plan obligation, actual results may differ significantly from estimations. Such differences are adjusted over time as the assumptions are replaced by facts and values are recalculated. See Note 12 for additional information on the Corporation’s retirement plans.
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 common stock awards is their fair market value on the date of grant. 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 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. 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. See Note 11 for additional information on stock-based compensation.
Comprehensive Income	Comprehensive Income Comprehensive income includes all changes in stockholders’ equity during a period, except those resulting from transactions with stockholders. In addition to net income, other components of the Corporation’s comprehensive income include the after tax effect of changes in net unrealized gain / loss on securities AFS and changes in net actuarial gain / loss on defined benefit pension and postretirement plans. Comprehensive income is reported on the accompanying consolidated statements of changes in stockholder’s equity and consolidated statements of comprehensive income. See Note 22 for additional information on accumulated other comprehensive income (loss).
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). As there is no active market for many of the Corporation’s financial instruments, estimates are made using discounted cash flow or other valuation techniques. Inputs into the valuation methods are subjective in nature, involve uncertainties, and require significant judgment and therefore cannot be determined with precision. Accordingly, the derived fair value estimates presented herein are not necessarily indicative of the amounts the Corporation could realize in a current market exchange. Assets and liabilities are categorized into three levels based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy in which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Corporation’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. See Note 18 for additional information on fair value measurements. Below is a brief description of each fair value level. Level 1 — Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Corporation has the ability to access. Level 2 — Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 3 — Level 3 inputs are unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity.
Cash and Cash Equivalents	Cash, Cash Equivalents, and Restricted Cash For purposes of the consolidated statements of cash flows, cash, cash equivalents, and restricted cash are considered to include cash and due from banks, interest-bearing deposits in other financial institutions, federal funds sold and securities purchased under agreements to resell.
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) and common stock warrants. See Note 20 for additional information on earnings per common share.
Credit Loss, Financial Instrument	Impact of Adopting ASU 2016-13 Financial Instruments - Credit Losses (Topic 326) 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 along with a DTA of $33 million were recorded. The following table illustrates the impact of adoption by loan segmentation: December 31, 2019 January 1, 2020 ($ 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 HTM securities was approximately $61,000 at January 1, 2020, attributable entirely to the Corporation's municipal securities.
Recently Issued Authoritative Accounting Guidance	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 HTM 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. 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 discussed in the table below. To the extent that the adoption of new accounting standards materially affects the Corporation’s financial condition, results of operations, or liquidity, the impacts are discussed in the applicable sections of this financial review. 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 Upon adoption, the Corporation will have changes in the presentation of its disclosures but no impact to its results of operation, financial position and liquidity. ASU 2019-12 The FASB issued this amendment to simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendment also improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments in this Update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendment is permitted. 1st Quarter 2021 Upon adoption, the Corporation will have an immaterial impact to its results of operation, financial position and liquidity. ASU 2020-08 Codification Improvements to Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs The FASB issued this amendment to clarify that an entity should reevaluate whether a callable debt security is within the scope of paragraph 310-20-35-33 for each reporting period. The amendments in this Update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendments is not permitted. 1st Quarter 2021 Upon adoption, the Corporation will have an immaterial impact to its results of operation, financial position and liquidity.

Acquisitions Acquisitions (Tabl

Acquisitions Acquisitions (Tables)	Feb. 14, 2020	Jun. 14, 2019
Business Combinations [Abstract]
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
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the First Staunton acquisition: ($ in Thousands) Purchase Accounting Adjustments February 14, 2020 Assets Cash and cash equivalents $ — $ 44,782 Investment securities AFS (24) 98,743 Federal Home Loan Bank and Federal Reserve Bank stocks, at cost — 781 Loans (4,808) 369,741 Premises and equipment, net (3,005) 4,865 Bank owned life insurance 9 6,770 Goodwill 14,812 Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets) 7,379 7,379 OREO (included in other assets on the face of the consolidated balance sheets) 670 762 Other assets 2,795 7,692 Total assets $ 556,328 Liabilities Deposits $ 1,285 $ 438,684 Other borrowings 61 34,613 Accrued expenses and other liabilities 179 6,730 Total liabilities $ 480,028 Total consideration paid $ 76,300	The following table presents the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date related to the 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

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U.S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U.S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA/FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943 The amortized cost and fair values of securities AFS and HTM at December 31, 2019 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS 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 AFS $ 3,251,950 $ 30,920 $ (20,284) $ 3,262,586 Investment securities HTM 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 HTM $ 2,205,083 $ 79,744 $ (8,363) $ 2,276,465
Investment securities held to maturity	The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U.S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U.S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA/FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943 The amortized cost and fair values of securities AFS and HTM at December 31, 2019 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS 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 AFS $ 3,251,950 $ 30,920 $ (20,284) $ 3,262,586 Investment securities HTM 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 HTM $ 2,205,083 $ 79,744 $ (8,363) $ 2,276,465
Amortized cost and fair values of investment securities available for sale and held to maturity by contractual maturity	Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of investment securities AFS and HTM at December 31, 2020, are shown below: AFS HTM ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 7,385 $ 7,394 $ 29,665 $ 29,938 Due after one year through five years 83,293 84,112 54,313 56,196 Due after five years through ten years 350,687 371,076 187,853 197,850 Due after ten years 38,113 42,650 1,171,068 1,292,485 Total debt securities 479,478 505,231 1,442,900 1,576,469 Residential mortgage-related securities FNMA / FHLMC 1,448,806 1,461,241 54,599 57,490 GNMA 231,364 235,537 114,553 118,813 Commercial mortgage-related securities FNMA / FHLMC 19,654 22,904 11,211 11,211 GNMA 511,429 524,756 255,742 264,960 Asset backed securities FFELP 329,030 327,189 — — SBA 8,637 8,584 — — Total investment securities $ 3,028,399 $ 3,085,441 $ 1,879,005 $ 2,028,943 Ratio of Fair Value to Amortized Cost 101.9 % 108.0 %
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]	On a quarterly basis, the Corporation refreshes the credit quality of each HTM security. The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020: ($ in Thousands) AAA AA A Total U.S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,252 860,607 14,041 1,441,900 Residential mortgage-related securities FNMA/FHLMC 54,599 — — 54,599 GNMA 114,553 — — 114,553 Commercial mortgage-related securities FNMA/FHLMC 11,211 — — 11,211 GNMA 255,742 — — 255,742 Total HTM securities $ 1,004,357 $ 860,607 $ 14,041 $ 1,879,005
Realized gains and losses and proceeds from sale	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 and write-up of investment securities for each of the three years ended December 31 are shown below. ($ in Thousands) 2020 2019 2018 Gross gains on AFS securities $ 9,312 $ 6,374 $ 1,954 Gross (losses) on AFS securities (90) (13,861) (3,938) Write-up of equity securities without readily determinable fair values — 13,444 — Investment securities gains (losses), net $ 9,222 $ 5,957 $ (1,985) Proceeds from sales of investment securities $ 626,283 $ 1,367,476 $ 601,130
Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length	The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at December 31, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized (Losses) Fair Investment securities AFS Residential mortgage-related securities FNMA / FHLMC 7 $ (500) $ 163,002 — $ — $ — $ (500) $ 163,002 GNMA 2 (3) 9,784 — — — (3) 9,784 GNMA commercial mortgage-related securities 1 — 287 — — — — 287 Asset backed securities FFELP 1 (129) 9,267 16 (2,885) 178,681 (3,013) 187,948 SBA 14 (53) 8,379 — — — (53) 8,379 Other debt securities 2 — 2,000 — — — — 2,000 Total 27 $ (685) $ 192,720 16 $ (2,885) $ 178,681 $ (3,570) $ 371,400 Investment securities HTM GNMA residential mortgage-related securities 1 $ — $ 325 — $ — $ — $ — $ 325 Total 1 $ — $ 325 — $ — $ — $ — $ 325 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS 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 HTM 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 (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Loan composition	Loans at December 31 are summarized below: ($ in Thousands) 2020 2019 PPP $ 767,757 $ — Commercial and industrial 7,701,422 7,354,594 Commercial real estate - owner occupied 900,912 911,265 Commercial and business lending 9,370,091 8,265,858 Commercial real estate - investor 4,342,584 3,794,517 Real estate construction 1,840,417 1,420,900 Commercial real estate lending 6,183,001 5,215,417 Total commercial 15,553,091 13,481,275 Residential mortgage 7,878,324 8,136,980 Home equity 707,255 852,025 Other consumer 313,054 351,159 Total consumer 8,898,632 9,340,164 Total loans $ 24,451,724 $ 22,821,440
Loans to Related Parties	The Corporation has granted loans to its directors, executive officers, or their related interests. These loans were made on substantially the same terms, including rates and collateral, as those prevailing at the time for comparable transactions with other unrelated customers, and do not involve more than a normal risk of collection. These loans to related parties are summarized below: ($ in Thousands) 2020 2019 Balance at beginning of year $ 16,772 $ 17,831 New loans 19,140 3,673 Repayments (6,643) (8,053) Change due to status of executive officers and directors 152 3,320 Balance at end of year $ 29,420 $ 16,772
Commercial and consumer loans by credit quality indicator	The following table presents commercial and consumer loans by credit quality indicator by vintage year at December 31, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 745,767 $ — $ — $ — $ — $ — $ 745,767 Special Mention — — 3,988 — — — — — 3,988 Potential Problem — — 18,002 — — — — — 18,002 PPP $ — $ — $ 767,757 $ — $ — $ — $ — $ — $ 767,757 Commercial and industrial: Risk rating: Pass $ 4,628 $ 2,177,138 $ 1,389,260 $ 1,435,519 $ 1,182,302 $ 483,957 $ 305,998 $ 453,734 $ 7,427,908 Special Mention — 10,159 2,719 39,854 37,042 113 215 67 90,169 Potential Problem (c) 2,565 7,237 19,331 28,413 56,580 2,269 6,477 1,179 121,487 Nonaccrual (d) 16,852 — 6,238 5,789 17,014 16,623 8,781 7,414 61,859 Commercial and industrial $ 24,045 $ 2,194,534 $ 1,417,548 $ 1,509,575 $ 1,292,938 $ 502,962 $ 321,471 $ 462,394 $ 7,701,422 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,022 $ 185,861 $ 209,069 $ 128,360 $ 99,546 $ 147,366 $ 79,111 $ 867,335 Special Mention — 113 1,882 3,122 300 658 264 — 6,339 Potential Problem — 3,486 4,104 8,916 — 1,490 4,437 3,747 26,179 Nonaccrual — — — — — 318 — 740 1,058 Commercial real estate - owner occupied $ 1,150 $ 21,621 $ 191,847 $ 221,107 $ 128,660 $ 102,012 $ 152,067 $ 83,598 $ 900,912 Commercial and business lending: Risk rating: Pass $ 5,778 $ 2,195,160 $ 2,320,888 $ 1,644,588 $ 1,310,662 $ 583,503 $ 453,364 $ 532,845 $ 9,041,009 Special Mention — 10,272 8,589 42,976 37,342 771 479 67 100,496 Potential Problem (c) 2,565 10,723 41,437 37,329 56,580 3,759 10,915 4,926 165,668 Nonaccrual (d) 16,852 — 6,238 5,789 17,014 16,941 8,781 8,154 62,917 Commercial and business lending $ 25,195 $ 2,216,154 $ 2,377,152 $ 1,730,682 $ 1,421,598 $ 604,974 $ 473,539 $ 545,992 $ 9,370,091 Commercial real estate - investor: Risk rating: Pass $ 10,971 $ 171,497 $ 1,249,644 $ 976,332 $ 720,237 $ 271,987 $ 341,658 $ 211,360 $ 3,942,714 Special Mention — — 90,235 97,333 12,339 — 21,882 8,465 230,254 Potential Problem — 838 16,343 13,575 30,911 2,279 239 27,209 91,396 Nonaccrual 19,803 — 10,141 53,056 446 14,267 — 309 78,220 Commercial real estate - investor $ 30,774 $ 172,335 $ 1,366,364 $ 1,140,297 $ 763,933 $ 288,533 $ 363,779 $ 247,343 $ 4,342,584 Real estate construction: Risk rating: Pass $ 776 $ 47,880 $ 645,925 $ 738,561 $ 294,910 $ 25,219 $ 2,420 $ 16,768 $ 1,771,682 Special Mention — — 487 494 48,283 42 — 30 49,336 Potential Problem — — 135 — 18,803 — 93 15 19,046 Nonaccrual — — — — — 16 — 338 353 Real estate construction $ 776 $ 47,880 $ 646,547 $ 739,055 $ 361,996 $ 25,277 $ 2,513 $ 17,150 $ 1,840,417 Commercial real estate lending: Risk rating: Pass $ 11,746 $ 219,377 $ 1,895,569 $ 1,714,893 $ 1,015,146 $ 297,205 $ 344,078 $ 228,127 $ 5,714,396 Special Mention — — 90,722 97,827 60,622 42 21,882 8,494 279,590 Potential Problem — 838 16,479 13,575 49,714 2,279 332 27,224 110,442 Nonaccrual 19,803 — 10,141 53,056 446 14,283 — 647 78,573 Commercial real estate lending $ 31,549 $ 220,215 $ 2,012,911 $ 1,879,352 $ 1,125,929 $ 313,810 $ 366,292 $ 264,493 $ 6,183,001 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 17,524 $ 2,414,537 $ 4,216,457 $ 3,359,482 $ 2,325,808 $ 880,708 $ 797,441 $ 760,973 $ 14,755,405 Special Mention — 10,272 99,311 140,803 97,964 813 22,361 8,562 380,086 Potential Problem (c) 2,565 11,561 57,916 50,905 106,295 6,038 11,247 32,150 276,111 Nonaccrual (d) 36,655 — 16,379 58,845 17,460 31,224 8,781 8,801 141,490 Total commercial $ 56,745 $ 2,436,370 $ 4,390,063 $ 3,610,033 $ 2,547,526 $ 918,783 $ 839,831 $ 810,485 $ 15,553,091 Residential mortgage: Risk rating: Pass $ — $ — $ 2,185,240 $ 1,490,589 $ 615,118 $ 998,072 $ 911,797 $ 1,612,971 $ 7,813,788 Special Mention — — — 355 330 102 126 537 1,450 Potential Problem — — 1,200 689 652 — 179 1,028 3,749 Nonaccrual — — 1,478 2,271 5,882 7,116 11,003 31,587 59,337 Residential mortgage $ — $ — $ 2,187,918 $ 1,493,903 $ 621,983 $ 1,005,290 $ 923,105 $ 1,646,124 $ 7,878,324 Home equity: Risk rating: Pass $ 10,224 $ 569,389 $ 2,057 $ 12,968 $ 15,792 $ 11,594 $ 5,803 $ 76,165 $ 693,767 Special Mention 596 631 — 39 14 39 4 804 1,532 Potential Problem — 1,922 — — — — — 146 2,068 Nonaccrual 1,600 100 965 134 410 319 711 7,249 9,888 Home equity $ 12,421 $ 572,041 $ 3,022 $ 13,141 $ 16,216 $ 11,952 $ 6,518 $ 84,364 $ 707,255 Other consumer: Risk rating: Pass $ 70 $ 165,114 $ 9,525 $ 10,309 $ 3,987 $ 1,872 $ 1,185 $ 120,425 $ 312,416 Special Mention 5 438 13 16 11 4 7 8 498 Nonaccrual 5 33 9 49 21 10 — 18 140 Other consumer $ 81 $ 165,585 $ 9,547 $ 10,374 $ 4,019 $ 1,886 $ 1,192 $ 120,451 $ 313,054 Total consumer: Risk rating: Pass $ 10,294 $ 734,502 $ 2,196,822 $ 1,513,865 $ 634,897 $ 1,011,539 $ 918,785 $ 1,809,561 $ 8,819,971 Special Mention 602 1,069 13 410 356 145 137 1,349 3,480 Potential Problem — 1,922 1,200 689 652 — 179 1,174 5,817 Nonaccrual 1,605 133 2,452 2,454 6,313 7,445 11,714 38,854 69,364 Total consumer $ 12,501 $ 737,626 $ 2,200,487 $ 1,517,417 $ 642,218 $ 1,019,128 $ 930,816 $ 1,850,939 $ 8,898,632 Total loans: Risk rating: Pass $ 27,819 $ 3,149,039 $ 6,413,278 $ 4,873,347 $ 2,960,705 $ 1,892,247 $ 1,716,226 $ 2,570,534 $ 23,575,376 Special Mention 602 11,341 99,324 141,213 98,320 958 22,498 9,911 383,566 Potential Problem (c) 2,565 13,483 59,116 51,593 106,947 6,038 11,426 33,324 281,928 Nonaccrual (d) 38,260 133 18,831 61,298 23,773 38,669 20,496 47,655 210,854 Total loans $ 69,246 $ 3,173,996 $ 6,590,550 $ 5,127,451 $ 3,189,745 $ 1,937,912 $ 1,770,647 $ 2,661,424 $ 24,451,724 (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 $41 million of oil and gas related loans (d) Includes $37 million of oil and gas related loans The following table presents commercial and consumer loans by credit quality indicator at December 31, 2019: ($ 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 by past due status	The following table presents loans by past due status at December 31, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 767,757 $ — $ — $ — $ — $ 767,757 Commercial and industrial 7,633,269 2,819 3,300 175 61,859 7,701,422 Commercial real estate - owner occupied 899,480 158 215 — 1,058 900,912 Commercial and business lending 9,300,506 2,977 3,516 175 62,917 9,370,091 Commercial real estate - investor 4,251,571 1,024 11,769 — 78,220 4,342,584 Real estate construction 1,839,073 991 — — 353 1,840,417 Commercial real estate lending 6,090,644 2,015 11,769 — 78,573 6,183,001 Total commercial 15,391,150 4,992 15,284 175 141,490 15,553,091 Residential mortgage 7,808,294 8,975 1,410 308 59,337 7,878,324 Home equity 692,565 3,071 1,731 — 9,888 707,255 Other consumer 310,200 1,039 560 1,115 140 313,054 Total consumer 8,811,060 13,085 3,701 1,423 69,364 8,898,632 Total loans $ 24,202,209 $ 18,077 $ 18,985 $ 1,598 $ 210,854 $ 24,451,724 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4103 of the CARES Act. (b) Of the total nonaccrual loans, $128 million, or 61%, were current with respect to payment at December 31, 2020. (c) No interest income was recognized on nonaccrual loans for the year ended December 31, 2020. In addition, there were $140 million of nonaccrual loans for which there was no related ACLL at December 31, 2020. The following table presents loans by past due status at December 31, 2019: Accruing ($ in Thousands) Current 30-59 Days 60-89 Days 90+ Days 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 n 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: December 31, 2020 December 31, 2019 December 31, 2018 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 12,713 $ 6,967 $ 16,678 $ 7,376 $ 25,478 $ 249 Commercial real estate - owner occupied 1,711 — 1,676 — 2,080 — Commercial real estate - investor 26,435 225 293 — 799 933 Real estate construction 260 111 298 179 311 198 Residential mortgage 7,825 11,509 3,955 13,035 16,036 22,279 Home equity 1,957 1,379 1,896 1,904 7,385 2,627 Other consumer 1,191 — 1,246 1 1,174 6 Total restructured loans (b) $ 52,092 $ 20,190 $ 26,041 $ 22,494 $ 53,263 $ 26,292 (a) Nonaccrual restructured loans have been included within nonaccrual loans. (b) Does not include any restructured loans related to the COVID-19 pandemic 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: Years Ended December 31, 2020 2019 2018 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial 7 $ 1,823 $ 2,059 6 $ 7,588 $ 7,703 5 $ 1,315 $ 1,330 Commercial real estate - owner occupied 4 658 689 — — — — — — Commercial real estate - investor 10 26,563 26,567 — — — 2 1,393 1,472 Real estate construction — — — 1 77 77 1 78 80 Residential mortgage 36 6,031 6,113 53 7,436 7,517 41 6,977 7,210 Home equity 20 1,078 1,697 24 831 845 34 1,649 1,681 Other consumer — — — 1 8 8 3 17 19 Total loans modified 77 $ 36,154 $ 37,125 85 $ 15,940 $ 16,150 86 $ 11,429 $ 11,792 (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 years ended December 31, 2020, 2019, and 2018, respectively, as well as the recorded investment in these restructured loans as of December 31, 2020, 2019, and 2018, respectively: Years Ended December 31, 2020 2019 2018 ($ in Thousands) Number of Recorded Number of Recorded Number of Recorded Commercial and industrial — $ — — $ — 3 $ — Commercial real estate — investor — — 1 461 — — Residential mortgage 5 1,036 38 5,630 20 3,553 Home equity 4 208 27 868 32 1,688 Total loans modified 9 $ 1,244 66 $ 6,959 55 $ 5,241
Changes in the allowance for loan losses by portfolio segment	December 31, 2020: ($ in Thousands) Dec. 31, 2019 Cumulative effect of ASU 2016-13 adoption (CECL) Jan. 1, 2020 Charge offs Recoveries Net Charge offs Gross up of allowance for PCD loans at acquisition Provision recorded at acquisition Provision for credit losses Dec. 31, 2020 ACLL / Loans Allowance for loan losses PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 Commercial and industrial 91,133 52,919 144,052 (80,320) 7,004 (73,316) 293 408 71,355 142,793 Commercial real estate — owner occupied 10,284 (1,851) 8,433 (419) 147 (272) 890 255 1,967 11,274 Commercial and business lending 101,417 51,068 152,485 (80,739) 7,151 (73,588) 1,183 663 73,853 154,598 Commercial real estate — investor 40,514 2,041 42,555 (22,920) 643 (22,277) 753 472 71,933 93,435 Real estate construction 24,915 7,467 32,382 (19) 49 31 435 492 25,854 59,193 Commercial real estate lending 65,428 9,508 74,937 (22,938) 692 (22,246) 1,188 964 97,787 152,629 Total commercial 166,846 60,576 227,422 (103,677) 7,844 (95,834) 2,371 1,627 171,641 307,226 Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 Home equity 10,926 11,649 22,575 (1,719) 1,978 259 422 374 (4,781) 18,849 Other consumer 6,639 7,016 13,655 (4,790) 1,101 (3,689) 61 140 4,462 14,630 Total consumer 34,525 51,880 86,405 (8,376) 3,579 (4,797) 1,134 917 (7,183) 76,475 Total loans $ 201,371 $ 112,457 $ 313,828 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,543 $ 164,457 $ 383,702 Allowance for unfunded commitments Commercial and industrial $ 12,276 $ (3,998) $ 8,278 $ — $ — $ — $ — $ 61 $ 13,972 $ 22,311 Commercial real estate — owner occupied 127 — 127 — — — — 4 135 266 Commercial and business lending 12,403 (3,998) 8,405 — — — — 65 14,108 22,577 Commercial real estate — investor 530 246 776 — — — — 2 (141) 636 Real estate construction 7,532 18,347 25,879 — — — — 45 (7,038) 18,886 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 (7,179) 19,522 Total commercial 20,465 14,595 35,060 — — — — 112 6,929 42,099 Home equity 1,038 2,591 3,629 — — — — 66 (577) 3,118 Other consumer 405 1,504 1,909 — — — — — 649 2,557 Total consumer 1,443 4,095 5,538 — — — — 66 72 5,676 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 7,000 $ 47,776 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 0.07 % Commercial and industrial 103,409 48,921 152,330 (80,320) 7,004 (73,316) 293 469 85,327 165,105 2.14 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 147 (272) 890 259 2,102 11,539 1.28 % Commercial and business lending 113,820 47,070 160,890 (80,739) 7,151 (73,588) 1,183 728 87,961 177,175 1.89 % Commercial real estate — investor 41,044 2,287 43,331 (22,920) 643 (22,277) 753 474 71,792 94,071 2.17 % Real estate construction 32,447 25,814 58,261 (19) 49 31 435 537 18,816 78,079 4.24 % Commercial real estate lending 73,490 28,101 101,591 (22,938) 692 (22,246) 1,188 1,011 90,608 172,151 2.78 % Total commercial 187,311 75,171 262,482 (103,677) 7,844 (95,834) 2,371 1,739 178,569 349,326 2.25 % Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,865) 42,997 0.55 % Home equity 11,964 14,240 26,204 (1,719) 1,978 259 422 440 (5,358) 21,967 3.11 % Other consumer 7,044 8,520 15,564 (4,790) 1,101 (3,689) 61 140 5,111 17,187 5.49 % Total consumer 35,968 55,975 91,943 (8,376) 3,579 (4,797) 1,134 983 (7,112) 82,151 0.92 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,722 $ 171,457 $ 431,478 1.76 % 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) 65,428 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) 4,158 (6,558) (9,766) 34,525 Total loans $ 238,023 $ (74,313) $ 19,161 $ (55,152) $ 18,500 $ 201,371

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	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 $17 million decrease due to the sale of ABRC during the second quarter of 2020. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) 2020 2019 2018 Core deposit intangibles Gross carrying amount at the beginning of the year $ 80,730 $ 58,100 $ — Additions during the period 7,379 22,630 58,100 Accumulated amortization (21,205) (12,456) (5,326) Net book value $ 66,904 $ 68,274 $ 52,774 Amortization during the year $ 8,749 $ 7,130 $ 5,326 Other intangibles Gross carrying amount at the beginning of the year $ 38,970 $ 44,887 $ 34,572 Additions during the period 200 — 10,359 Reductions due to sale (17,435) (217) (43) Accumulated amortization (20,385) (24,643) (21,825) Net book value $ 1,350 $ 20,027 $ 23,062 Amortization during the year $ 1,443 $ 2,818 $ 2,833
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) 2020 2019 2018 Mortgage servicing rights Mortgage servicing rights at beginning of year $ 67,607 $ 68,433 $ 59,168 Additions from acquisition 1,357 — 8,136 Additions 13,667 11,606 10,722 Amortization (22,664) (12,432) (9,594) Mortgage servicing rights at end of year $ 59,967 $ 67,607 $ 68,433 Valuation allowance at beginning of year (302) (239) (784) (Additions) recoveries, net (17,704) (63) 545 Valuation allowance at end of year (18,006) (302) (239) Mortgage servicing rights, net $ 41,961 $ 67,306 $ 68,193 Fair value of mortgage servicing rights $ 41,990 $ 72,532 $ 81,012 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) 7,743,956 8,488,969 8,600,983 Mortgage servicing rights, net to servicing portfolio 0.54 % 0.79 % 0.79 % Mortgage servicing rights expense (a) $ 40,369 $ 12,494 $ 9,049 (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.
Summary of estimated future amortization expense	The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 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 Year ending December 31, 2021 $ 8,811 $ 200 $ 12,895 2022 8,811 200 14,372 2023 8,811 200 10,178 2024 8,811 200 7,502 2025 8,811 200 5,726 Beyond 2025 22,849 350 9,295 Total Estimated Amortization Expense $ 66,904 $ 1,350 $ 59,967

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	A summary of premises and equipment at December 31 is as follows: 2020 2019 ($ in Thousands) Estimated Cost Accumulated Net Book Net Book Land — $ 70,431 $ — $ 70,431 $ 69,649 Land improvements 3 – 15 years 18,488 8,716 9,771 9,355 Buildings and improvements 5 – 39 years 390,298 168,136 222,162 230,358 Computers 3 – 5 years 52,846 38,128 14,718 13,242 Furniture, fixtures and other equipment 3 – 15 years 174,362 116,304 58,058 53,342 Operating leases — 46,632 14,638 31,994 45,381 Leasehold improvements 3 – 15 years 33,706 21,925 11,781 13,958 Total premises and equipment $ 786,761 $ 367,847 $ 418,914 $ 435,284

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lease, Cost [Table Text Block]	Operating and finance lease costs and cash flows resulting from these leases are presented below: Twelve Months Ended December 31, ($ in Thousands) 2020 2019 Operating Lease Costs $ 11,450 $ 11,006 Finance Lease Costs 154 36 Operating Lease Cash Flows 11,276 11,305 Finance Lease Cash Flows 122 35
Assets And Liabilities, Lessee [Table Text Block]	The lease classifications on the consolidated balance sheets were as follows: Consolidated Balance Sheets Category December 31, 2020 December 31, 2019 ($ in Thousands) Amount Operating lease right-of-use asset Premises and equipment $ 31,994 $ 45,381 Finance lease right-of-use asset Other assets 962 2,188 Operating lease liability Accrued expenses and other liabilities 36,425 49,292 Finance lease liability Other long-term funding 1,128 2,209
Lessee, Operating Lease, Information [Table Text Block]	The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: December 31, 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 2.49 0.46 % $ 46 0.83 2.72 % Retail and corporate offices 34,036 6.04 3.33 % 48,940 6.49 3.34 % Land 6,385 8.99 3.09 % 6,594 9.57 3.21 % Total operating leases $ 40,806 6.45 3.27 % $ 55,580 6.83 3.32 % Finance leases Land $ 1,145 1.65 1.05 % $ 4,827 39.67 3.99 % Total finance leases $ 1,145 1.65 1.05 % $ 4,827 39.67 3.99 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Twelve Months Ending December 31, 2021 $ 9,120 $ 172 $ 9,293 2022 6,791 973 7,763 2023 5,525 — 5,525 2024 4,760 — 4,760 2025 3,818 — 3,818 Beyond 2025 10,792 — 10,792 Total lease payments $ 40,806 $ 1,145 $ 41,952 Less: interest 4,382 17 4,399 Present value of lease payments $ 36,425 $ 1,128 $ 37,553
Lessee, Operating Lease, Disclosure [Table Text Block]	The approximate minimum annual rental payments and rental receipts under noncancelable agreements and leases with remaining terms in excess of one year are as follows: ($ in Thousands) Payments Receipts 2021 $ 9,208 $ 3,148 2022 10,189 2,595 2023 6,086 1,986 2024 5,439 1,736 2025 4,268 1,625 Thereafter 11,679 7,568 Total $ 46,868 $ 18,658

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Deposits by type	The distribution of deposits at December 31 is as follows: ($ in Thousands) 2020 2019 Noninterest-bearing demand $ 7,661,728 $ 5,450,709 Savings 3,650,085 2,735,036 Interest-bearing demand 6,090,869 5,329,717 Money market 7,322,769 7,640,798 Brokered CDs — 5,964 Other time 1,757,030 2,616,839 Total deposits $ 26,482,481 $ 23,779,064
Time deposits by maturity	Aggregate annual maturities of all time deposits at December 31, 2020, are as follows: Maturities During Year Ending December 31, ($ in Thousands) 2021 $ 1,371,671 2022 236,667 2023 77,545 2024 45,185 2025 25,951 Thereafter 11 Total $ 1,757,030

Short and Long-term Funding (Ta

Short and Long-term Funding (Tables)	12 Months Ended
	Dec. 31, 2020
Short-term Debt [Abstract]
Short and Long-Term Funding Composition	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) December 31, 2020 December 31, 2019 Short-Term Funding Federal funds purchased $ 7,070 $ 362,000 Securities sold under agreements to repurchase 185,901 71,097 Federal funds purchased and securities sold under agreements to repurchase 192,971 433,097 Commercial paper 59,346 32,016 Total short-term funding $ 252,317 $ 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 Finance leases 1,128 2,209 Capitalized costs (1,663) (2,866) Total long-term funding 549,465 549,343 Total short and long-term funding, excluding FHLB advances $ 801,782 $ 1,014,456 FHLB Advances Short-term FHLB advances $ — $ 520,000 Long-term FHLB advances 1,632,723 2,660,967 Total FHLB advances $ 1,632,723 $ 3,180,967 Total short and long-term funding $ 2,434,505 $ 4,195,422
Schedule of Repurchase Agreements	The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of December 31, 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 December 31, 2020 Repurchase agreements Agency mortgage-related securities $ 185,901 $ — $ — $ — $ 185,901 Total $ 185,901 $ — $ — $ — $ 185,901 December 31, 2019 Repurchase agreements Agency mortgage-related securities $ 71,097 $ — $ — $ — $ 71,097 Total $ 71,097 $ — $ — $ — $ 71,097
Schedule of Maturities of Long-term Debt [Table Text Block]	The table below summarizes the maturities of the Corporation’s long-term funding, including long-term FHLB advances, at December 31, 2020: ($ in Thousands) Long Term Funding Weighted Average Contractual Long Term Funding Coupon Rate FHLB Weighted Average Contractual FHLB advance Coupon Rate Year 2021 $ 299,631 3.50 % $ 17,723 2.25 % 2022 967 1.07 % 7,383 3.70 % 2023 — — % 2,398 5.09 % 2024 — — % 633 — % 2025 248,867 4.25 % 1,000,215 2.34 % Thereafter — — % 604,371 2.32 % Total long-term funding $ 549,465 3.83 % $ 1,632,723 2.34 %

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Fair value assumptions of stock options	The following assumptions were used in estimating the fair value for options granted in 2020, 2019, and 2018: 2020 2019 2018 Dividend yield 3.50 % 3.30 % 2.50 % Risk-free interest rate 1.60 % 2.60 % 2.60 % Weighted average expected volatility 21.00 % 24.00 % 22.00 % Weighted average expected life 5.75 years 5.75 years 5.75 years Weighted average per share fair value of options $2.39 $4.00 $4.47
Summary of Company's Stock Option Activities	A summary of the Corporation’s stock option activity for the year ended December 31, 2020 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Aggregate Outstanding at December 31, 2019 5,543 $ 20.13 6.25 years $ 16,043 Granted 1,697 18.43 Exercised (182) 13.77 Forfeited or expired (585) 21.07 Outstanding at December 31, 2020 6,473 $ 19.77 6.23 years $ 2,005 Options exercisable at December 31, 2020 4,038 $ 19.25 4.89 years $ 1,913 (a) In thousands
Summary of Restricted Stock Awards Activity (Excluding Salary Shares)	The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2020: Restricted Stock Shares (a) Weighted Average Outstanding at December 31, 2019 2,393 $ 22.39 Granted 1,053 18.09 Vested (936) 22.59 Forfeited (218) 20.86 Outstanding at December 31, 2020 2,293 $ 20.46 (a) In thousands

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Change in Benefit Obligation	The funded status and amounts recognized in the 2020 and 2019 consolidated balance sheets, as measured on December 31, 2020 and 2019, respectively, for the RAP and Postretirement Plan were as follows: RAP Postretirement RAP Postretirement ($ in Thousands) 2020 2020 2019 2019 Change in Fair Value of Plan Assets Fair value of plan assets at beginning of year $ 442,034 $ — $ 390,564 $ — Actual return on plan assets 58,802 — 67,377 — Employer contributions — 210 — 270 Gross benefits paid (21,987) (210) (15,907) (270) Fair value of plan assets at end of year (a) $ 478,849 $ — $ 442,034 $ — Change in Benefit Obligation Net benefit obligation at beginning of year $ 260,576 $ 2,545 $ 233,658 $ 2,523 Service cost 8,244 — 7,263 — Interest cost 8,185 78 9,752 104 Actuarial (gain) loss 24,998 (169) 25,810 188 Gross benefits paid (21,987) (210) (15,907) (270) Net benefit obligation at end of year (a) $ 280,017 $ 2,243 $ 260,576 $ 2,545 Funded (unfunded) status $ 198,832 $ (2,243) $ 181,458 $ (2,545) Noncurrent assets $ 198,832 $ — $ 181,458 $ — Current liabilities — (189) — (214) Noncurrent liabilities — (2,055) — (2,330) Asset (liability) recognized on the consolidated balance sheets $ 198,832 $ (2,243) $ 181,458 $ (2,545) (a) The fair value of the plan assets represented 171% and 170% of the net benefit obligation of the pension plan at December 31, 2020 and 2019, respectively.
AOCI Components	Amounts recognized in accumulated other comprehensive (income) loss, net of tax, as of December 31, 2020 and 2019 were as follows: RAP Postretirement RAP Postretirement ($ in Thousands) 2020 2020 2019 2019 Prior service cost $ (194) $ (477) $ (249) $ (533) Net actuarial loss 28,029 — 37,075 126 Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss $ 27,835 $ (477) $ 36,827 $ (406)
Changes in OCI	Other changes in plan assets and benefit obligations recognized in OCI, net of tax, in 2020 and 2019 were as follows: RAP Postretirement RAP Postretirement ($ in Thousands) 2020 2020 2019 2019 Net actuarial gain (loss) $ 8,209 $ 169 $ 17,235 $ (188) Amortization of prior service cost (73) (75) (73) (75) Amortization of actuarial loss (gain) 3,897 — 480 (4) Income tax (expense) benefit (3,040) (23) (4,532) 67 Total Recognized in OCI $ 8,993 $ 71 $ 13,109 $ (200)
Net period benefit cost for the pension plans	The components of net pension cost for the RAP for 2020, 2019, and 2018 were as follows: ($ in Thousands) 2020 2019 2018 Service cost $ 8,244 $ 7,263 $ 7,540 Interest cost 8,185 9,752 9,125 Expected return on plan assets (25,595) (24,332) (23,195) Amortization of prior service cost (73) (73) (73) Amortization of actuarial loss (gain) 3,897 480 2,195 Recognized settlement loss (gain) — — 809 Total net periodic pension cost (income) $ (5,342) $ (6,910) $ (3,600)
Net period benefit cost for postretirement plan	The components of net periodic benefit cost for the Postretirement Plan for 2020, 2019, and 2018 were as follows: ($ in Thousands) 2020 2019 2018 Interest cost $ 78 $ 104 $ 108 Amortization of prior service cost (75) (75) (75) Amortization of actuarial loss (gain) — (4) 8 Total net periodic benefit cost $ 3 $ 25 $ 41
Weighted Average Benefit Assumptions	RAP Postretirement RAP Postretirement 2020 2020 2019 2019 Weighted average assumptions used to determine benefit obligations Discount rate 2.40 % 2.40 % 3.20 % 3.20 % Rate of increase in compensation levels 2.00 % N/A 2.00 % N/A Weighted average assumptions used to determine net periodic benefit costs Discount rate 3.20 % 3.20 % 4.30 % 4.30 % Rate of increase in compensation levels 2.00 % N/A 3.00 % N/A Expected long-term rate of return on plan assets 6.20 % N/A 6.00 % N/A
Plan Asset Allocation Percentages	The asset allocation for the RAP as of the December 31, 2020 and 2019 measurement dates, respectively, by asset category were as follows: Asset Category 2020 2019 Equity securities 53 % 51 % Fixed-income securities 33 % 33 % Group annuity contracts 11 % 11 % Alternative securities 1 % 3 % Other 2 % 2 % Total 100 % 100 %
Pension Plan Investments	Based on these inputs, the following table summarizes the fair value of the RAP’s investments as of December 31, 2020 and 2019: Fair Value Measurements Using ($ in Thousands) December 31, 2020 Level 1 Level 2 Level 3 RAP Investments Money market account $ 9,429 $ 9,429 $ — $ — Common /collective trust funds 172,950 172,950 — — Mutual funds 245,605 245,605 — — Group annuity contracts 50,866 — — 50,866 Total RAP Investments $ 478,849 $ 427,983 $ — $ 50,866 Fair Value Measurements Using ($ in Thousands) December 31, 2019 Level 1 Level 2 Level 3 RAP Investments Money market account $ 8,903 $ 8,903 $ — $ — Common /collective trust funds 155,964 155,964 — — Mutual funds 227,112 227,112 — — Group annuity contracts 50,055 — — 50,055 Total RAP Investments $ 442,034 $ 391,979 $ — $ 50,055
Schedule of Changes in Fair Value of Plan Assets	The following presents a summary of the changes in the fair value of the RAP's Level 3 asset during the periods indicated. Fair Value Reconciliation of Level 3 RAP Investments 2020 2019 Fair value of group annuity contract at beginning of period $ 50,055 $ 47,265 Return on plan assets 3,499 5,495 Benefits paid (2,688) (2,704) Fair value of group annuity contract at end of period $ 50,866 $ 50,055
Expected Benefit Payments	The projected benefit payments were calculated using the same assumptions as those used to calculate the benefit obligations listed above. The projected benefit payments for the RAP and Postretirement Plan at December 31, 2020, reflecting expected future services, were as follows: ($ in Thousands) RAP Postretirement Plan Estimated future benefit payments 2021 $ 19,332 $ 191 2022 20,043 186 2023 19,785 181 2024 20,304 175 2025 21,766 168 2026-2030 91,228 732
One Percentage Point Change in Assumed Health Care Cost	A one percentage point change in the assumed health care cost trend rate would have the following effect: 2020 2019 ($ in Thousands) 100 bp Increase 100 bp Decrease 100 bp Increase 100 bp Decrease Effect on total of service and interest cost $ 5 $ (4) $ 7 $ (6) Effect on postretirement benefit obligation $ 141 $ (124) $ 170 $ (148)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Current and Deferred Income Tax Expense (Benefit)	The current and deferred amounts of income tax expense (benefit) were as follows: Years Ended December 31, ($ in Thousands) 2020 2019 2018 Current Federal $ 33,020 $ 50,560 $ 20,246 State 16,193 15,327 12,593 Total current 49,213 65,887 32,839 Deferred Federal (25,895) 14,094 34,941 State (3,118) (261) 12,006 Total deferred (29,013) 13,833 46,947 Total income tax expense $ 20,200 $ 79,720 $ 79,786
Schedule of Deferred Tax Assets and Liabilities	Temporary differences between the amounts reported on the financial statements and the tax bases of assets and liabilities resulted in deferred taxes. DTAs and liabilities at December 31, 2020 and 2019 were as follows: ($ in Thousands) 2020 2019 Deferred tax assets Allowance for loan losses $ 88,967 $ 48,790 Allowance for other losses 16,347 7,236 Accrued liabilities 4,673 4,005 Deferred compensation 27,896 28,018 Benefit of tax loss and credit carryforwards 9,789 13,444 Nonaccrual interest 1,763 1,299 Basis difference from equity securities and other investments 6,329 — Net unrealized losses on pension and postretirement benefits 9,110 12,174 Other 997 970 Total deferred tax assets $ 165,871 $ 115,936 Valuation allowance for deferred tax assets (251) (251) Total deferred tax assets after valuation allowance $ 165,620 $ 115,685 Deferred tax liabilities Prepaid expenses $ 63,113 $ 62,227 Goodwill 21,698 21,099 Mortgage banking activities 10,403 17,418 Deferred loan fee income 9,799 12,190 State deferred taxes 2,636 722 Lease financing 116 199 Bank premises and equipment 17,757 18,348 Purchase accounting 12,658 13,738 Basis difference from equity securities and other investments — 2,285 Net unrealized gains on AFS securities 13,568 1,139 Other 1,049 1,156 Total deferred tax liabilities $ 152,797 $ 150,521 Net deferred tax assets (liabilities) $ 12,823 $ (34,836)
Summary of Valuation Allowance [Table Text Block]	The changes in the valuation allowance related to net operating losses for 2020 and 2019 were as follows: ($ in Thousands) 2020 2019 Valuation allowance for deferred tax assets, beginning of year $ (251) $ (251) (Increase) decrease in current year — — Valuation allowance for deferred tax assets, end of year $ (251) $ (251)
Schedule of Effective Income Tax Rate Reconciliation	The effective income tax rate differs from the statutory federal tax rate. The major reasons for this difference were as follows: 2020 2019 2018 Federal income tax rate at statutory rate 21.0 % 21.0 % 21.0 % Increases (decreases) resulting from: Tax-exempt interest and dividends (3.9) % (3.3) % (2.6) % State income taxes (net of federal benefit) 3.7 % 3.5 % 3.7 % Bank owned life insurance (0.9) % (0.8) % (0.7) % Tax effect of tax credits and benefits, net of related expenses (1.8) % (0.9) % (0.7) % Tax reserve adjustments / settlements 0.1 % 0.2 % 1.5 % Net tax (benefit) expense from stock-based compensation 0.3 % (0.2) % (0.5) % Tax planning in response to the Tax Act — % — % (3.6) % Restructuring in conjunction with ABRC sale (13.7) % — % — % FDIC premium 0.8 % 0.5 % 0.9 % Other 0.6 % (0.4) % 0.3 % Effective income tax rate 6.2 % 19.6 % 19.3 %
Summary Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits was as f ollows: ($ in Millions) 2020 2019 Balance at beginning of year $ 3 $ 2 Additions for tax positions related to current year — 1 Balance at end of year $ 3 $ 3

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other Derivative Instruments Not Designated As Hedging Instruments [Table Text Block]	The following table presents the total notional amounts and gross fair values of the Corporation's derivatives, as well as the balance sheet netting adjustments as of December 31, 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 December 31, 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. The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments: December 31, 2020 December 31, 2019 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Notional Amount Fair Notional Amount Fair Notional Amount Fair Not designated as hedging instruments Interest rate-related instruments $ 3,639,679 $ 192,518 $ 3,639,679 $ 25,680 $ 3,029,877 $ 77,024 $ 3,029,877 $ 13,073 Foreign currency exchange forwards 411,292 4,909 398,890 4,836 272,636 4,226 264,653 4,048 Commodity contracts 87,547 12,486 83,214 11,155 255,089 20,528 255,165 19,624 Mortgage banking (a) 226,818 9,624 335,500 2,046 255,291 2,527 263,000 710 Gross derivatives before netting $ 219,537 $ 43,716 $ 104,305 $ 37,455 Less: Legally enforceable master netting agreements 1,936 1,936 10,410 10,410 Less: Cash collateral pledged/received 10,879 25,625 1,408 11,365 Total derivative instruments, after netting $ 206,722 $ 16,155 $ 92,487 $ 15,680
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income during the twelve months ended December 31, 2020 and 2019: Location and Amount of Gain or (Loss) Recognized on Consolidated Statements of Income in Fair Value and Cash Flow Hedging Relationships Year Ended December 31, 2020 Year Ended December 31, 2019 ($ in Thousands) 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 fair value or cash flow hedges are recorded (a) $ (1,779) $ — $ (448) $ — The effects of fair value and cash flow hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (1,779) — 5,871 — Derivatives designated as hedging instruments (a) — — (6,319) — (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 during the twelve months ended December 31, 2020 and 2019: Consolidated Statements of Income Category of For the Year Ended December 31, ($ in Thousands) 2020 2019 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital market fees, net $ (1,758) $ (1,393) Interest rate lock commitments (mortgage) Mortgage banking, net 7,097 319 Forward commitments (mortgage) Mortgage banking, net 1,335 1,362 Foreign currency exchange forwards Capital market fees, net (105) 132 Commodity contracts Capital market fees, net 427 (1,763)

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2020
Offsetting [Abstract]
Balance Sheet Offsetting of Derivative Assets and Liabilities	The interest, commodity and foreign exchange agreements the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table: Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Gross Amounts Recognized Derivative Liabilities Offset Cash Collateral Received Net Derivative assets December 31, 2020 $ 13,441 $ (1,936) $ (10,879) $ 626 $ — $ 626 December 31, 2019 11,864 (10,410) (1,408) 45 — 45 Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Gross Amounts Recognized Derivative Assets Offset Cash Collateral Pledged Net Derivative liabilities December 31, 2020 $ 27,951 $ (1,936) $ (25,625) $ 390 $ — $ 390 December 31, 2019 22,189 (10,410) (11,365) 413 — 413

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: ($ in Thousands) 2020 2019 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 10,010,492 $ 9,024,412 Commercial letters of credit (a) 3,642 7,081 Standby letters of credit (c) 278,798 277,969 (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 December 31, 2020 or 2019. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14. (c) The Corporation has established a liability of $3 million at both December 31, 2020 and 2019 as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Year Ended December 31, 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 7,000 (2,500) Amount recorded at acquisition 179 70 Balance at end of period $ 47,776 $ 21,907

Parent Company Only Financial_2

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Parent Company Balance Sheet	Balance Sheets December 31, ($ in Thousands) 2020 2019 Assets Cash and due from banks $ 40,204 $ 17,427 Interest-bearing deposits in other financial institutions 15,228 27,186 Notes and interest receivable from subsidiaries 305,779 201,551 Investments in and receivable due from subsidiaries 4,005,198 3,925,596 Other assets 46,850 46,234 Total assets $ 4,413,259 $ 4,217,994 Liabilities and Stockholders' Equity Commercial paper $ 59,346 $ 32,016 Subordinated notes, at par 250,000 250,000 Long-term funding capitalized costs (1,133) (1,428) Total long-term funding 248,867 248,572 Accrued expenses and other liabilities 14,113 15,282 Total liabilities 322,326 295,870 Preferred equity 353,512 256,716 Common equity 3,737,421 3,665,407 Total stockholders’ equity 4,090,933 3,922,124 Total liabilities and stockholders’ equity $ 4,413,259 $ 4,217,994
Parent Company Income Statement	Statements of Income For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Income Income from subsidiaries $ 317,895 $ 341,789 $ 354,637 Interest income on notes receivable from subsidiaries 3,257 13,983 12,199 Other income 933 761 994 Total income 322,084 356,532 367,830 Expense Interest expense on short and long-term funding 10,960 16,802 18,355 Other expense 6,422 6,583 11,736 Total expense 17,383 23,384 30,091 Income before income tax expense 304,702 333,148 337,739 Income tax expense (benefit) (2,070) 6,359 4,176 Net income 306,771 326,790 333,562 Preferred stock dividends 18,358 15,202 10,784 Net income available to common equity $ 288,413 $ 311,587 $ 322,779
Parent Company Statement of Cash Flows	Statements of Cash Flows For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Cash Flows from Operating Activities Net income $ 306,771 $ 326,790 $ 333,562 Adjustments to reconcile net income to net cash provided by operating activities: (Increase) decrease in equity in undistributed net income (loss) of subsidiaries (61,406) (21,789) (18,636) Net change in other assets and accrued expenses and other liabilities (49,890) 265 (92,366) Net cash provided by operating activities 195,475 305,266 222,562 Cash Flows from Investing Activities Proceeds from sales of investment securities — — 827 Net (increase) decrease in notes receivable from subsidiaries (105,000) 250,000 (139,317) Net (increase) decrease in loans — — 2,210 Net cash provided by (used in) investing activities (105,000) 250,000 (136,280) Cash Flows from Financing Activities Net increase (decrease) in commercial paper 27,330 (13,406) (22,044) Redemption of Corporation's senior notes — (250,000) — Proceeds from issuance of common stock for stock-based compensation plans 3,966 11,216 18,408 Proceeds from issuance of preferred stock 96,796 — 97,315 Purchase of preferred stock — — (537) Common stock warrants exercised — — (1) Purchase of common stock returned to authorized but unissued — — (33,075) Issuance of treasury stock for acquisition — — 91,296 Purchase of treasury stock, open market purchases (71,255) (177,484) (206,450) Purchase of treasury stock, stock-based compensation plans (6,113) (8,592) (7,148) Cash dividends on common stock (112,023) (111,804) (105,519) Cash dividends on preferred stock (18,358) (15,202) (10,784) Net cash used in financing activities (79,656) (565,272) (178,540) Net increase (decrease) in cash and cash equivalents 10,819 (10,006) (92,258) Cash and cash equivalents at beginning of year 44,613 54,619 146,877 Cash and cash equivalents at end of year $ 55,432 $ 44,613 $ 54,619

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 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 December 31, 2020 and 2019, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy December 31, 2020 December 31, 2019 Assets Investment securities AFS U.S. Treasury securities Level 1 $ 26,531 $ — Agency securities Level 2 25,038 — Obligations of state and political subdivisions (municipal securities) Level 2 450,662 546,160 Residential mortgage-related securities FNMA / FHLMC Level 2 1,461,241 132,660 GNMA Level 2 235,537 985,139 Commercial mortgage-related securities FNMA / FHLMC Level 2 22,904 21,728 GNMA Level 2 524,756 1,310,207 Asset backed securities FFELP Level 2 327,189 263,693 SBA Level 2 8,584 — Other debt securities Level 2 3,000 3,000 Total investment securities AFS Level 1 $ 26,531 $ — Total investment securities AFS Level 2 3,058,910 3,262,586 Equity securities with readily determinable fair values Level 1 1,661 1,646 Residential loans held for sale Level 2 129,158 136,280 Interest rate-related instruments (a) Level 2 192,518 77,024 Foreign currency exchange forwards (a) Level 2 4,909 4,226 Commodity contracts (a) Level 2 12,486 20,528 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 9,624 2,527 Liabilities Interest rate-related instruments (a) Level 2 $ 25,680 $ 13,073 Foreign currency exchange forwards (a) Level 2 4,836 4,048 Commodity contracts (a) Level 2 11,155 19,624 Forward commitments to sell residential mortgage loans Level 3 2,046 710 (a) Figures presented gross before netting. See Note 14 and Note 15 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.
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 years ended December 31, 2020 and 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 $ 72,659 $ (3,505) $ 76,164 Closed loans / settlements (76,001) (12,587) (63,414) Other 10,439 17,427 (6,988) Mortgage derivative gain (loss) 7,097 1,335 5,762 Balance December 31, 2020 $ 9,624 $ 2,046 $ 7,579
Equity Securities without Readily Determinable Fair Value	Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of December 31, 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 December 31, 2020 $ 13,444 Cumulative upward carrying value changes between January 1, 2018 and December 31, 2020 $ 13,444 Cumulative downward carrying value changes between January 1, 2018 and December 31, 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: ($ in Thousands) Fair Value Hierarchy Fair Value Consolidated Statements of Income Category of Adjustment Recognized on the Consolidated Statements of Income December 31, 2020 Assets Individually evaluated loans (a) Level 3 $ 138,752 Provision for credit losses $ (97,519) OREO (b) Level 2 6,125 Other noninterest expense (3,747) Mortgage servicing rights Level 3 41,990 Mortgage banking, net (17,704) 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 credit 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: December 31, 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 8% - 47% 20% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 0% - 40% 34%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: December 31, 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 $ 416,154 $ 416,154 $ 373,380 $ 373,380 Interest-bearing deposits in other financial institutions Level 1 298,759 298,759 207,624 207,624 Federal funds sold and securities purchased under agreements to resell Level 1 1,135 1,135 7,740 7,740 Investment securities HTM, net Level 1 999 1,024 999 1,018 Investment securities HTM, net Level 2 1,877,939 2,027,852 2,204,084 2,275,447 Investment securities AFS Level 1 26,531 26,531 — — Investment securities AFS Level 2 3,058,910 3,058,910 3,262,586 3,262,586 Equity securities with readily determinable fair values Level 1 1,661 1,661 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 2 129,158 129,158 136,280 136,280 Commercial loans held for sale Level 2 — — 15,000 15,000 Loans, net Level 3 24,068,022 24,012,738 22,620,068 22,399,621 Bank and corporate owned life insurance Level 2 679,647 679,647 671,948 671,948 Derivatives (other assets) (a) Level 2 209,913 209,913 101,778 101,778 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 9,624 9,624 2,527 2,527 Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 24,725,451 $ 24,725,451 $ 21,156,261 $ 21,156,261 Brokered CDs and other time deposits (b) Level 2 1,757,030 1,766,200 2,622,803 2,622,803 Short-term funding (c) Level 2 252,317 252,303 465,113 465,113 FHLB advances Level 2 1,632,723 1,760,727 3,180,967 3,207,793 Other long-term funding Level 2 549,465 578,233 549,343 572,873 Standby letters of credit (d) Level 2 2,731 2,731 2,710 2,710 Derivatives (accrued expenses and other liabilities) (a) Level 2 41,671 41,671 36,745 36,745 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 2,046 2,046 710 710 (a) Figures presented gross before netting. See Note 14 and Note 15 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 $279 million and $278 million at December 31, 2020 and 2019, respectively. See Note 16 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The actual capital amounts and ratios of the Corporation and its significant subsidiary are presented below. No deductions from capital were made for interest rate risk in 2020 or 2019. Actual For Capital Adequacy To Be Well Capitalized Under Prompt Corrective Action Provisions (a) ($ in Thousands) Amount Ratio (a) Amount Ratio Amount Ratio As of December 31 , 2020 Associated Banc-Corp Total capital $ 3,632,807 14.02 % $ 2,072,273 ≥ 8.00 % Tier 1 capital 3,058,809 11.81 % 1,554,205 ≥ 6.00 % Common equity Tier 1 capital 2,706,010 10.45 % 1,165,654 ≥ 4.50 % Leverage 3,058,809 9.37 % 1,305,604 ≥ 4.00 % Associated Bank, N.A. Total capital $ 3,295,823 12.74 % $ 2,068,801 ≥ 8.00 % $ 2,586,002 ≥ 10.00 % Tier 1 capital 2,971,234 11.49 % 1,551,601 ≥ 6.00 % 2,068,801 ≥ 8.00 % Common equity Tier 1 capital 2,971,234 11.49 % 1,163,701 ≥ 4.50 % 1,680,901 ≥ 6.50 % Leverage 2,971,234 9.11 % 1,304,448 ≥ 4.00 % 1,630,560 ≥ 5.00 % As of December 31 , 2019 Associated Banc-Corp Total capital $ 3,208,625 13.21 % $ 1,943,711 ≥ 8.00 % Tier 1 capital 2,736,776 11.26 % 1,457,783 ≥ 6.00 % Common equity Tier 1 capital 2,480,698 10.21 % 1,093,337 ≥ 4.50 % Leverage 2,736,776 8.83 % 1,239,431 ≥ 4.00 % Associated Bank, N.A. Total capital $ 2,892,650 11.95 % $ 1,936,732 ≥ 8.00 % $ 2,420,915 ≥ 10.00 % Tier 1 capital 2,669,372 11.03 % 1,452,549 ≥ 6.00 % 1,936,732 ≥ 8.00 % Common equity Tier 1 capital 2,469,578 10.20 % 1,089,412 ≥ 4.50 % 1,573,595 ≥ 6.50 % Leverage 2,669,372 8.63 % 1,236,565 ≥ 4.00 % 1,545,706 ≥ 5.00 % (a) Prompt corrective action provisions are not applicable at the bank holding company level.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 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: For the Years Ended December 31, ($ in Thousands, except per share data) 2020 2019 2018 Net income $ 306,771 $ 326,790 $ 333,562 Preferred stock dividends (18,358) (15,202) (10,784) Net income available to common equity 288,413 311,587 322,779 Common shareholder dividends (111,291) (111,091) (104,981) Unvested share-based payment awards (732) (713) (537) Undistributed earnings 176,390 199,784 217,260 Undistributed earnings allocated to common shareholders 175,134 198,424 216,199 Undistributed earnings allocated to unvested share-based payment awards 1,256 1,360 1,060 Undistributed earnings $ 176,390 $ 199,784 $ 217,260 Basic Distributed earnings to common shareholders $ 111,291 $ 111,091 $ 104,981 Undistributed earnings allocated to common shareholders 175,134 198,424 216,199 Total common shareholders earnings, basic $ 286,425 $ 309,514 $ 321,181 Diluted Distributed earnings to common shareholders $ 111,291 $ 111,091 $ 104,981 Undistributed earnings allocated to common shareholders 175,134 198,424 216,199 Total common shareholders earnings, diluted $ 286,425 $ 309,514 $ 321,181 Weighted average common shares outstanding $ 153,005 $ 160,534 $ 167,345 Effect of dilutive common stock awards 637 1,398 1,985 Effect of dilutive common stock warrants — — 402 Diluted weighted average common shares outstanding $ 153,642 $ 161,932 $ 169,732 Basic earnings per common share $ 1.87 $ 1.93 $ 1.92 Diluted earnings per common share $ 1.86 $ 1.91 $ 1.89

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 395,135 $ 447,979 $ 458,240 Net intersegment interest income (expense) 10,400 (52,200) (33,519) Segment net interest income 405,535 395,779 424,721 Noninterest income 149,456 136,097 132,071 Total revenue 554,991 531,876 556,793 Provision for credit losses 59,780 49,341 42,234 Noninterest expense 209,507 233,655 233,202 Income (loss) before income taxes 285,705 248,879 281,356 Income tax expense (benefit) 53,193 47,480 54,732 Net income $ 232,512 $ 201,399 $ 226,625 Allocated goodwill $ 530,144 $ 530,144 $ 528,832 Community, Consumer, and Business For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 295,297 $ 301,563 $ 322,020 Net intersegment interest income (expense) 54,203 93,331 76,876 Segment net interest income 349,500 394,894 398,896 Noninterest income 185,737 223,712 212,711 Total revenue 535,237 618,606 611,607 Provision for credit losses 21,862 18,594 18,500 Noninterest expense 429,447 467,086 463,187 Income (loss) before income taxes 83,928 132,925 129,920 Income tax expense (benefit) 17,625 27,914 27,283 Net income $ 66,303 $ 105,011 $ 102,637 Allocated goodwill $ 579,156 $ 646,086 $ 640,191 Risk Management and Shared Services For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 72,525 $ 86,132 $ 99,320 Net intersegment interest income (expense) (64,603) (41,130) (43,357) Segment net interest income 7,922 45,001 55,963 Noninterest income (a) 178,862 21,015 10,785 Total revenue 186,784 66,017 66,748 Provision for credit losses 92,365 (51,935) (60,734) Noninterest expense (b) 137,080 93,247 125,410 Income (loss) before income taxes (42,661) 24,705 2,073 Income tax expense (benefit) (c) (50,618) 4,325 (2,228) Net income $ 7,957 $ 20,379 $ 4,301 Allocated goodwill $ — $ — $ — Consolidated Total For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Net interest income $ 762,957 $ 835,674 $ 879,580 Net intersegment interest income (expense) — — — Segment net interest income 762,957 835,674 879,580 Noninterest income (a) 514,056 380,824 355,568 Total revenue 1,277,012 1,216,498 1,235,148 Provision for credit losses 174,006 16,000 — Noninterest expense (b) 776,034 793,988 821,799 Income (loss) before income taxes 326,972 406,509 413,349 Income tax expense (benefit) (c) 20,200 79,720 79,786 Net income $ 306,771 $ 326,790 $ 333,562 Allocated goodwill $ 1,109,300 $ 1,176,230 $ 1,169,023

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Summary of activity in accumulated other comprehensive income (loss)	The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2020, 2019, and 2018 respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Defined Benefit Accumulated Balance, December 31, 2017 $ (38,453) $ (24,305) $ (62,758) Other comprehensive income (loss) before reclassifications (39,891) (28,612) (68,503) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net 1,985 — 1,985 Personnel expense — (148) (148) Other expense — 2,203 2,203 Interest income (572) — (572) Adjustment for adoption of ASU 2016-01 (84) — (84) Adjustment for adoption of ASU 2018-02 (8,419) (5,235) (13,654) Income tax (expense) benefit 9,791 6,767 16,558 Net other comprehensive income (loss) during period (37,189) (25,025) (62,214) Balance, December 31, 2018 $ (75,643) $ (49,330) $ (124,972) Other comprehensive income (loss) before reclassifications $ 111,592 $ 16,296 $ 127,887 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (5,957) — (5,957) Personnel expense — (148) (148) Other expense — 476 476 Interest income 895 — 895 Income tax (expense) benefit (26,898) (4,465) (31,363) Net other comprehensive income (loss) during period 79,631 12,158 91,789 Balance, December 31, 2019 $ 3,989 $ (37,172) $ (33,183) Other comprehensive income (loss) before reclassifications $ 55,628 $ 7,780 $ 63,408 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (9,222) — (9,222) Personnel expense — (148) (148) Other expense — 3,897 3,897 Interest income 3,359 — 3,359 Income tax (expense) benefit (12,429) (3,064) (15,493) Net other comprehensive income (loss) during period 37,336 8,465 45,801 Balance, December 31, 2020 $ 41,325 $ (28,707) $ 12,618

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue Recognition [Abstract]
Disaggregation of Revenue [Table Text Block]	The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ 83,570 $ 80,719 $ 79,685 Service charges and deposit account fees 16,903 13,342 15,424 Card-based fees (b) 1,534 1,827 1,796 Insurance commissions and fees 208 364 349 Other revenue 3,462 1,647 997 Noninterest Income (in-scope of Topic 606) $ 105,678 $ 97,899 $ 98,251 Noninterest Income (out-of-scope of Topic 606) 43,778 38,198 33,820 Total Noninterest Income $ 149,456 $ 136,097 $ 132,071 Community, Consumer, and Business For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ 1,387 $ 2,838 $ 2,655 Service charges and deposit account fees 39,371 49,744 50,582 Card-based fees (b) 36,937 37,895 37,977 Insurance commissions and fees 45,027 88,727 89,123 Other revenue 19,053 9,462 9,887 Noninterest Income (in-scope of Topic 606) $ 141,775 $ 188,666 $ 190,225 Noninterest Income (out-of-scope of Topic 606) 43,962 35,046 22,486 Total Noninterest Income $ 185,737 $ 223,712 $ 212,711 Risk Management and Share Services For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ — $ (90) $ 222 Service charges and deposit account fees 33 49 69 Card-based fees (b) 134 190 37 Insurance commissions and fees 10 13 39 Other revenue (1,552) 1,370 1,242 Noninterest Income (in-scope of Topic 606) $ (1,375) $ 1,532 $ 1,609 Noninterest Income (out-of-scope of Topic 606) (c) 180,237 19,483 9,176 Total Noninterest Income $ 178,862 $ 21,015 $ 10,785 Consolidated Total For the Years Ended December 31, ($ in Thousands) 2020 2019 2018 Wealth management fees (a) $ 84,957 $ 83,467 $ 82,562 Service charges and deposit account fees 56,307 63,135 66,075 Card-based fees (b) 38,605 39,912 39,810 Insurance commissions and fees 45,245 89,104 89,511 Other revenue 20,963 12,629 12,126 Noninterest Income (in-scope of Topic 606) $ 246,077 $ 288,247 $ 290,084 Noninterest Income (out-of-scope of Topic 606) (c) 267,979 92,577 65,484 Total Noninterest Income $ 514,056 $ 380,824 $ 355,568 (a) Includes trust, asset management, brokerage, and annuity fees. (b) Certain card-based fees are out-of-scope of Topic 606. (c) The year ended December 31, 2020 includes a gain of $163 million from the sale of ABRC.
Revenue Recognition 606 [Text Block]	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 on deposit accounts 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 on deposit accounts is primarily received immediately or in the following month through a direct charge to the customers’ accounts. Card-based fees (a) Card-based fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month. Trust and asset management fees (b) Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to the customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and advisory fees (b) Brokerage and advisory fees primarily consists of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage and advisory fees are included in wealth management fees.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 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 impact of adoption by loan segmentation: 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

Summary of Significant Accoun_4

Summary of Significant Accounting Policies, Credit Loss Adoption Impact (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			$ 201,371
Cumulative effect of ASU 2016-13 adoption (CECL)	$ 47,776		21,907
Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			166,846
Cumulative effect of ASU 2016-13 adoption (CECL)			20,465
Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			34,525
Cumulative effect of ASU 2016-13 adoption (CECL)			1,443
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Commercial and industrial | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			91,133
Cumulative effect of ASU 2016-13 adoption (CECL)			12,276
Commercial real estate - owner occupied | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			10,284
Cumulative effect of ASU 2016-13 adoption (CECL)			127
Commercial and business lending | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			101,417
Cumulative effect of ASU 2016-13 adoption (CECL)			12,403
Commercial real estate - investor | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			40,514
Cumulative effect of ASU 2016-13 adoption (CECL)			530
Real estate construction | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			24,915
Cumulative effect of ASU 2016-13 adoption (CECL)			7,532
Commercial Real Estate | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			65,428
Cumulative effect of ASU 2016-13 adoption (CECL)			8,062
Residential mortgage | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			16,960
Cumulative effect of ASU 2016-13 adoption (CECL)			0
Home Equity Loan | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			10,926
Cumulative effect of ASU 2016-13 adoption (CECL)			1,038
Other consumer | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			6,639
Cumulative effect of ASU 2016-13 adoption (CECL)			$ 405
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum
Finite-Lived Intangible Assets [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 131,147
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		75,171
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		55,975
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial and industrial | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		48,921
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial real estate - owner occupied | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		(1,851)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial and business lending | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		47,070
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial real estate - investor | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		2,287
Cumulative Effect, Period of Adoption, Adjustment [Member] | Real estate construction | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		25,814
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Real Estate | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		28,101
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential mortgage | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		33,215
Cumulative Effect, Period of Adoption, Adjustment [Member] | Home Equity Loan | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		14,240
Cumulative Effect, Period of Adoption, Adjustment [Member] | Other consumer | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		8,520
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		354,425
Cumulative effect of ASU 2016-13 adoption (CECL)		40,597
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		262,482
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		91,943
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial and industrial | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		152,330
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial real estate - owner occupied | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		8,560
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial and business lending | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		160,890
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial real estate - investor | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		43,331
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Real estate construction | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		58,261
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Real Estate | Total commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		101,591
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Residential mortgage | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		50,175
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Home Equity Loan | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		26,204
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Other consumer | Total consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 15,564

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held to maturity allowance for credit loss	$ (67)	$ 61
Retained Earnings (Accumulated Deficit)	2,458,920		$ 2,380,867
Cumulative effect of ASU 2016-13 adoption (CECL)	47,776		21,907
Financing Receivable, Allowance for Credit Loss			201,371
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		131,147
Allowance for Loan Losses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	383,702		201,371
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of ASU 2016-13 adoption (CECL)	47,776		$ 21,907
Accounting Standards Update 2016-13 [Member]
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 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of ASU 2016-13 adoption (CECL)		18,690
Accounting Standards Update 2016-13 [Member] | Allowance for Loan Losses [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	112,457	112,000
Accounting Standards Update 2016-13 [Member] | SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of ASU 2016-13 adoption (CECL)	$ 18,690	19,000
Accounting Standards Update 2016-13 [Member] | Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 131,000

Acquisitions Staunton Acquisiti

Acquisitions Staunton Acquisition (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Feb. 14, 2020	Jun. 14, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
February 14, 2020
Fair value of liabilities assumed				$ 480,028	$ 725,764	$ 2,340,323
First Staunton Bancshares
Purchase Accounting Adjustments
Cash and cash equivalents		$ 0
Investment securities AFS		(24)
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		0
Loans		(4,808)
Premises and equipment, net		(3,005)
Bank owned life insurance		9
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)		7,379
OREO (included in other assets on the face of the consolidated balance sheets)		670
Other assets		2,795
Deposits		1,285
Other borrowings		61
Accrued expenses and other liabilities		179
February 14, 2020
Cash and cash equivalents		44,782
Investment securities AFS		98,743
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		781
Loans		369,741
Premises and equipment, net		4,865
Bank owned life insurance		6,770
Goodwill	$ 82,000	14,812		$ 15,000
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)		7,379
OREO (included in other assets on the face of the consolidated balance sheets)		762
Other assets		7,692
Total assets		556,328
Deposits		438,684
Other borrowings		34,613
Other Liabilities		6,730
Fair value of liabilities assumed		480,028
Total consideration paid		$ 76,300
Huntington National Bank [Member]
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
Accrued expenses and other liabilities			70
February 14, 2020
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
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

Huntington Acquisition (Details

Huntington Acquisition (Details) - USD ($) $ in Thousands	Jun. 14, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
June 14, 2019
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		$ 480,028	$ 725,764	$ 2,340,323
Huntington National Bank [Member]
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
Accrued expenses and 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
Other real estate owned (included in other assets on the face of the Consolidated Balance Sheets)	5,263
Other assets	559
Deposits	725,173
Other Liabilities	590
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 725,764

Acquisitions and Dispositions (

Acquisitions and Dispositions (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Business Combinations [Abstract]
Deposits	$ 26,482,481	$ 23,779,064

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Thousands	Dec. 11, 2020USD ($)branch	Sep. 22, 2020USD ($)branch	Jun. 30, 2020USD ($)	Feb. 14, 2020USD ($)	Jun. 14, 2019USD ($)branch	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Business Acquisition [Line Items]
Deposits						$ 26,482,481		$ 26,482,481	$ 23,779,064
First Staunton Bancshares
Business Acquisition [Line Items]
Business Acquisition, 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.
Goodwill			$ 82,000	$ 14,812				$ 15,000
Goodwill, Other Increase (Decrease)						$ 1,000	$ (2,000)
PCD-HTM Securities				0
PCD-AFS Securities				$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				10 years
Total consideration paid				$ 76,300
Huntington National Bank [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition					Jun. 14, 2019
Business Acquisition, Name of Acquired Entity					Huntington
Business Combination, Control Obtained Description	received a 4% purchase premium	receiving a 4% purchase premium			The Corporation paid a 4% premium on acquired deposits.
New Communities | branch					13
Acquired Net Branches | branch					14
Goodwill					$ 7,286
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					10 years
ABRC [Member]
Business Acquisition [Line Items]
Total consideration paid			266,000
Gain (Loss) on Disposition of Intangible Assets			$ 163,000
Peoria, IL [Member]
Business Acquisition [Line Items]
disposed net branches | branch	5
Deposits	$ 180,000
Southwest Wisconsin [Member]
Business Acquisition [Line Items]
disposed net branches | branch	2
Deposits	$ 53,000
Monroe, WI [Member]
Business Acquisition [Line Items]
disposed net branches | branch		1
Deposits		$ 38,000

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities AFS
Amortized Cost	$ 3,028,399	$ 3,251,950
Gross Unrealized Gains	60,612	30,920
Gross Unrealized Losses	(3,570)	(20,284)
Fair Value	3,085,441	3,262,586
Investment securities HTM
Investment securities held to maturity	1,879,005	2,205,083
Gross Unrealized Gains	149,938	79,744
Held-to-maturity, Gross Unrealized Loss	0	(8,363)
Fair Value	2,028,943	2,276,465
U.S. Treasury securities
Investment securities AFS
Amortized Cost	26,436
Gross Unrealized Gains	95
Gross Unrealized Losses	0
Fair Value	26,531
Investment securities HTM
Investment securities held to maturity	999	999
Gross Unrealized Gains	25	19
Held-to-maturity, Gross Unrealized Loss	0	0
Fair Value	1,024	1,018
Obligations of state and political subdivisions (municipal securities)
Investment securities AFS
Amortized Cost	425,057	529,908
Gross Unrealized Gains	25,605	16,269
Gross Unrealized Losses	0	(18)
Fair Value	450,662	546,160
Investment securities HTM
Investment securities held to maturity	1,441,900	1,418,569
Gross Unrealized Gains	133,544	69,775
Held-to-maturity, Gross Unrealized Loss	0	(1,118)
Fair Value	1,575,445	1,487,227
FFELP asset backed securities
Investment securities AFS
Amortized Cost	329,030	270,178
Gross Unrealized Gains	1,172	0
Gross Unrealized Losses	(3,013)	(6,485)
Fair Value	327,189	263,693
Investment securities HTM
Investment securities held to maturity	0
Fair Value	0
Fixed-income securities
Investment securities AFS
Amortized Cost	3,000	3,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	3,000	3,000
Agency securities
Investment securities AFS
Amortized Cost	24,985
Gross Unrealized Gains	53
Gross Unrealized Losses	0
Fair Value	25,038
SBA
Investment securities AFS
Amortized Cost	8,637
Gross Unrealized Gains	0
Gross Unrealized Losses	(53)
Fair Value	8,584
Investment securities HTM
Investment securities held to maturity	0
Fair Value	0
FNMA/FHLMC [Member] | Residential Related Securities
Investment securities AFS
Amortized Cost	1,448,806	131,158
Gross Unrealized Gains	12,935	1,562
Gross Unrealized Losses	(500)	(59)
Fair Value	1,461,241	132,660
Investment securities HTM
Investment securities held to maturity	54,599	81,676
Gross Unrealized Gains	2,891	1,759
Held-to-maturity, Gross Unrealized Loss	0	(15)
Fair Value	57,490	83,420
FNMA/FHLMC [Member] | Commercial mortgage-related securities
Investment securities AFS
Amortized Cost	19,654	19,929
Gross Unrealized Gains	3,250	1,799
Gross Unrealized Losses	0	0
Fair Value	22,904	21,728
Investment securities HTM
Investment securities held to maturity	11,211
Gross Unrealized Gains	0
Held-to-maturity, Gross Unrealized Loss	0
Fair Value	11,211
GNMA | Residential Related Securities
Investment securities AFS
Amortized Cost	231,364	982,941
Gross Unrealized Gains	4,176	3,887
Gross Unrealized Losses	(3)	(1,689)
Fair Value	235,537	985,139
Investment securities HTM
Investment securities held to maturity	114,553	269,523
Gross Unrealized Gains	4,260	1,882
Held-to-maturity, Gross Unrealized Loss	0	(1,108)
Fair Value	118,813	270,296
GNMA | Commercial mortgage-related securities
Investment securities AFS
Amortized Cost	511,429	1,314,836
Gross Unrealized Gains	13,327	7,403
Gross Unrealized Losses	0	(12,032)
Fair Value	524,756	1,310,207
Investment securities HTM
Investment securities held to maturity	255,742	434,317
Gross Unrealized Gains	9,218	6,308
Held-to-maturity, Gross Unrealized Loss	0	(6,122)
Fair Value	$ 264,960	$ 434,503

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 7,385
Due after one year through five years	83,293
Due after five years through ten years	350,687
Due after ten years	38,113
Total debt securities	479,478
Investment securities available for sale, amortized cost	3,028,399	$ 3,251,950
Fair Value
Due in one year or less	7,394
Due after one year through five years	84,112
Due after five years through ten years	371,076
Due after ten years	42,650
Total debt securities, AFS Fair Value	505,231
Investment securities AFS, at fair value	$ 3,085,441	3,262,586
Ratio of Fair Value to Amortized Cost	101.90%
Amortized Cost
Due in one year or less	$ 29,665
Due after one year through five years	54,313
Due after five years through ten years	187,853
Due after ten years	1,171,068
Amortized Cost	1,879,005	2,205,083
Fair Value
Due in one year or less	29,938
Due after one year through five years	56,196
Due after five years through ten years	197,850
Due after ten years	1,292,485
Debt Securities, Held-to-maturity, Fair Value	$ 2,028,943	2,276,465
Ratio of Fair Value to Amortized Cost	108.00%
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	$ 1,442,900
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	1,576,469
FFELP asset backed securities
Amortized Cost
Investment securities available for sale, amortized cost	329,030	270,178
Fair Value
Investment securities AFS, at fair value	327,189	263,693
Amortized Cost
Amortized Cost	0
Fair Value
Debt Securities, Held-to-maturity, Fair Value	0
SBA
Amortized Cost
Investment securities available for sale, amortized cost	8,637
Fair Value
Investment securities AFS, at fair value	8,584
Amortized Cost
Amortized Cost	0
Fair Value
Debt Securities, Held-to-maturity, Fair Value	0
FNMA/FHLMC [Member] | Residential Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	1,448,806	131,158
Fair Value
Investment securities AFS, at fair value	1,461,241	132,660
Amortized Cost
Amortized Cost	54,599	81,676
Fair Value
Debt Securities, Held-to-maturity, Fair Value	57,490	83,420
FNMA/FHLMC [Member] | Commercial mortgage-related securities
Amortized Cost
Investment securities available for sale, amortized cost	19,654	19,929
Fair Value
Investment securities AFS, at fair value	22,904	21,728
Amortized Cost
Amortized Cost	11,211
Fair Value
Debt Securities, Held-to-maturity, Fair Value	11,211
GNMA | Residential Related Securities
Amortized Cost
Investment securities available for sale, amortized cost	231,364	982,941
Fair Value
Investment securities AFS, at fair value	235,537	985,139
Amortized Cost
Amortized Cost	114,553	269,523
Fair Value
Debt Securities, Held-to-maturity, Fair Value	118,813	270,296
GNMA | Commercial mortgage-related securities
Amortized Cost
Investment securities available for sale, amortized cost	511,429	1,314,836
Fair Value
Investment securities AFS, at fair value	524,756	1,310,207
Amortized Cost
Amortized Cost	255,742	434,317
Fair Value
Debt Securities, Held-to-maturity, Fair Value	$ 264,960	$ 434,503

Investment Securities, HTM Cred

Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 1,879,005	$ 2,205,083
U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	999	999
Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,441,900	$ 1,418,569
FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	54,599
GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	114,553
Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	11,211
Government National Mortgage Association Certificates And Obligations (GNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	255,742
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	1,004,357
AAA | U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	999
AAA | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	567,252
AAA | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	54,599
AAA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	114,553
AAA | Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	11,211
AAA | Government National Mortgage Association Certificates And Obligations (GNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	255,742
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	860,607
AA | U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	860,607
AA | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
AA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
AA | Government National Mortgage Association Certificates And Obligations (GNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	14,041
A | U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
A | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	14,041
A | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
A | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
A | Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	0
A | Government National Mortgage Association Certificates And Obligations (GNMA), Commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	$ 0

Investment Securities, Gains, L

Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Gross gains on AFS securities	$ 9,312	$ 6,374	$ 1,954
Gross (losses) on AFS securities	(90)	(13,861)	(3,938)
Carrying value changes	0	13,444	0
Investment securities gains (losses), net	9,222	5,957	(1,985)
Proceeds from sales of investment securities	$ 626,283	$ 1,367,476	$ 601,130

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2020USD ($)security	Dec. 31, 2019USD ($)security
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ (685)	$ (7,843)
Unrealized losses on available for sale securities, 12 months or more	(2,885)	(12,440)
Total unrealized losses on available for sale securities	(3,570)	(20,284)
Fair value of unrealized losses on available for sale securities, less than 12 months	192,720	834,616
Fair value of unrealized losses on available for sale securities, 12 months or more	178,681	748,487
Total fair value of unrealized losses on available for sale securities	$ 371,400	$ 1,583,104
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	27	65
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	16	51
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ 0	$ (2,199)
Unrealized losses on held to maturity securities, 12 months or more	0	(6,164)
Total unrealized losses on held to maturity securities	0	(8,363)
Fair value of unrealized losses on held to maturity securities, less than 12 months	325	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	$ 325	$ 659,799
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	1	67
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	0	36
Obligations of state and political subdivisions (municipal securities)
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
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
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months		(1,105)
Unrealized losses on held to maturity securities, 12 months or more		(13)
Total unrealized losses on held to maturity securities		(1,118)
Fair value of unrealized losses on held to maturity securities, less than 12 months		77,562
Fair value of unrealized losses on held to maturity securities, 12 months or more		2,378
Total fair value of unrealized losses on held to maturity securities		$ 79,940
Obligations of state and political subdivisions (municipal securities) | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security		4
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security		52
Obligations of state and political subdivisions (municipal securities) | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security		0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security		6
FFELP asset backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ (129)	$ (6,092)
Unrealized losses on available for sale securities, 12 months or more	(2,885)	(393)
Total unrealized losses on available for sale securities	(3,013)	(6,485)
Fair value of unrealized losses on available for sale securities, less than 12 months	9,267	250,780
Fair value of unrealized losses on available for sale securities, 12 months or more	178,681	12,913
Total fair value of unrealized losses on available for sale securities	$ 187,948	$ 263,693
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	1	19
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	16	2
SBA
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ (53)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(53)
Fair value of unrealized losses on available for sale securities, less than 12 months	8,379
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	$ 8,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	14
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0
Other debt securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ 0
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	0	0
Fair value of unrealized losses on available for sale securities, less than 12 months	2,000	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	$ 2,000	$ 2,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	2	2
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	0
FNMA/FHLMC [Member] | Residential Related Securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ (500)	$ 0
Unrealized losses on available for sale securities, 12 months or more	0	(59)
Total unrealized losses on available for sale securities	(500)	(59)
Fair value of unrealized losses on available for sale securities, less than 12 months	163,002	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	$ 163,002	$ 34,807
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	7	0
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	4
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
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 [Member] | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security		1
FNMA/FHLMC [Member] | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security		1
GNMA | Residential Related Securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ (3)	$ (924)
Unrealized losses on available for sale securities, 12 months or more	0	(766)
Total unrealized losses on available for sale securities	(3)	(1,689)
Fair value of unrealized losses on available for sale securities, less than 12 months	9,784	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	$ 9,784	$ 401,856
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	2	18
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	3
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ 0	$ (1,059)
Unrealized losses on held to maturity securities, 12 months or more	0	(49)
Total unrealized losses on held to maturity securities	0	(1,108)
Fair value of unrealized losses on held to maturity securities, less than 12 months	325	187,261
Fair value of unrealized losses on held to maturity securities, 12 months or more	0	6,587
Total fair value of unrealized losses on held to maturity securities	$ 325	$ 193,849
GNMA | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	1	12
GNMA | Residential Related Securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	0	8
GNMA | Commercial mortgage-related securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (810)
Unrealized losses on available for sale securities, 12 months or more	0	(11,222)
Total unrealized losses on available for sale securities	0	(12,032)
Fair value of unrealized losses on available for sale securities, less than 12 months	287	258,218
Fair value of unrealized losses on available for sale securities, 12 months or more	0	621,307
Total fair value of unrealized losses on available for sale securities	$ 287	$ 879,524
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	1	22
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	42
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
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 Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security		2
GNMA | Commercial mortgage-related securities | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security		21

Investment Securities (Details

Investment Securities (Details Textual) - USD ($)	Feb. 01, 2018	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Investment Securities Information [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value						$ 108,000,000
Interest receivable				$ 90,263,000	$ 91,196,000
Investment Securities (Textuals) [Abstract]
Debt Securities AFS Principal Sold		$ 261,000,000	$ 281,000,000		157,000,000
Gain (Loss) on Sales of Mortgage Backed Securities (MBS)		$ 3,000,000	$ 6,000,000
Transfer of HTM securities to AFS securities (adoption of ASU 2019-04)				$ 0	692,414,000	0
Debt Securities, Available-for-sale, Gain (Loss)					3,000,000
Carrying amount of Securities Sold					$ 1,200,000,000
Visa Restricted Stock Owned. Total				77,996
Visa Restricted Stock Owned at Fair Value [Member]					77,000
Visa Restricted Stock Donated [Member]					42,039
Debt Securities, Available-for-sale, Sold at Par Value						$ 108,000,000
Pledged Financial Instruments, Not Separately Reported, Securities				$ 1,600,000,000	$ 2,600,000,000
Debt Securities, Held-to-maturity, Past Due				0
Held to maturity allowance for credit loss				(67,000)			$ 61,000
Federal Home Loan Bank Stock				82,000,000	149,000,000
Federal Reserve Bank Stock				87,000,000	78,000,000
Interest receivable				90,263,000	91,196,000
Equity Securities with Readily Determined Fair Value				2,000,000	2,000,000
Equity Securities without Readily Determinable Fair Value, Amount				13,000,000	13,000,000
Visa Restricted Stock Owned at Zero Cost			996
First Staunton Bancshares
Investment Securities Information [Line Items]
Carrying amount of Securities Sold				84,000,000
Investment Securities (Textuals) [Abstract]
Carrying amount of Securities Sold				84,000,000
Bank Mutual [Member]
Investment Securities Information [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value	$ 453,000,000
Investment Securities (Textuals) [Abstract]
Debt Securities, Available-for-sale, Sold at Par Value	$ 453,000,000
Securities Sold [Member]
Investment Securities Information [Line Items]
Taxable Equivalent Yield						3.08%
Commercial mortgage-related securities | GNMA
Investment Securities Information [Line Items]
Debt Securities, Available-for-sale, Sold at Par Value						$ 40,000,000
Investment Securities (Textuals) [Abstract]
Debt Securities, Available-for-sale, Sold at Par Value						$ 40,000,000
Held-to-maturity Securities
Investment Securities Information [Line Items]
Interest receivable				14,000,000	16,000,000
Investment Securities (Textuals) [Abstract]
Interest receivable				14,000,000	16,000,000
Available-for-sale Securities [Member]
Investment Securities Information [Line Items]
Interest receivable				8,000,000	10,000,000
Investment Securities (Textuals) [Abstract]
Interest receivable				8,000,000	10,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Investment Securities Information [Line Items]
Interest receivable				972,000	2,000,000
Investment Securities (Textuals) [Abstract]
Interest receivable				972,000	2,000,000
Reinvestment [Member]
Investment Securities Information [Line Items]
Taxable Equivalent Yield						3.51%
Federal Reserve Bank Stock [Member]
Investment Securities Information [Line Items]
Interest receivable				0	0
Investment Securities (Textuals) [Abstract]
Interest receivable				$ 0	$ 0

Loans, Loan Composition (Detail

Loans, Loan Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable [Line Items]
Loans	$ 24,451,724	$ 22,821,440
PPP
Loans and Leases Receivable [Line Items]
Loans	767,757	0
Commercial and industrial
Loans and Leases Receivable [Line Items]
Loans	7,701,422	7,354,594
Commercial real estate - owner occupied
Loans and Leases Receivable [Line Items]
Loans	900,912	911,265
Commercial and business lending
Loans and Leases Receivable [Line Items]
Loans	9,370,091	8,265,858
Commercial real estate - investor
Loans and Leases Receivable [Line Items]
Loans	4,342,584	3,794,517
Real estate construction
Loans and Leases Receivable [Line Items]
Loans	1,840,417	1,420,900
Commercial real estate lending
Loans and Leases Receivable [Line Items]
Loans	6,183,001	5,215,417
Total commercial
Loans and Leases Receivable [Line Items]
Loans	15,553,091	13,481,275
Residential mortgage
Loans and Leases Receivable [Line Items]
Loans	7,878,324	8,136,980
Home equity
Loans and Leases Receivable [Line Items]
Loans	707,255	852,025
Other consumer
Loans and Leases Receivable [Line Items]
Loans	313,054	351,159
Total consumer
Loans and Leases Receivable [Line Items]
Loans	$ 8,898,632	$ 9,340,164

Loans, Related Party Loan Rollf

Loans, Related Party Loan Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$ 16,772	$ 17,831
New loans	19,140	3,673
Repayments	(6,643)	(8,053)
Change due to status of executive officers and directors	152	3,320
Balance at end of year	$ 29,420	$ 16,772

Loans, Credit Quality Indicator

Loans, Credit Quality Indicator by Vintage Year (Details) $ in Thousands	Dec. 31, 2020USD ($)
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	$ 69,246
Financing Receivable, Revolving	3,173,996
Financing Receivable, Year One, Originated, Current Fiscal Year	6,590,550
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,127,451
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,189,745
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,937,912
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,770,647
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,661,424
Total	24,451,724
Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	27,819
Financing Receivable, Revolving	3,149,039
Financing Receivable, Year One, Originated, Current Fiscal Year	6,413,278
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,873,347
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,960,705
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,892,247
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,716,226
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,570,534
Total	23,575,376
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	602
Financing Receivable, Revolving	11,341
Financing Receivable, Year One, Originated, Current Fiscal Year	99,324
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	141,213
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	98,320
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	22,498
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,911
Total	383,566
Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,565
Financing Receivable, Revolving	13,483
Financing Receivable, Year One, Originated, Current Fiscal Year	59,116
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	51,593
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	106,947
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,038
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	11,426
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	33,324
Total	281,928
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	38,260
Financing Receivable, Revolving	133
Financing Receivable, Year One, Originated, Current Fiscal Year	18,831
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	61,298
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	23,773
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	38,669
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	20,496
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	47,655
Total	210,854
Oil and Gas Portfolio Segment [Member] | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Total	41,000
Oil and Gas Portfolio Segment [Member] | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total	37,000
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	56,745
Financing Receivable, Revolving	2,436,370
Financing Receivable, Year One, Originated, Current Fiscal Year	4,390,063
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,610,033
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,547,526
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	918,783
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	839,831
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	810,485
Total	15,553,091
Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	17,524
Financing Receivable, Revolving	2,414,537
Financing Receivable, Year One, Originated, Current Fiscal Year	4,216,457
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,359,482
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,325,808
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	880,708
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	797,441
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	760,973
Total	14,755,405
Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	10,272
Financing Receivable, Year One, Originated, Current Fiscal Year	99,311
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	140,803
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	97,964
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	813
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	22,361
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,562
Total	380,086
Total commercial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,565
Financing Receivable, Revolving	11,561
Financing Receivable, Year One, Originated, Current Fiscal Year	57,916
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	50,905
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	106,295
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	6,038
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	11,247
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	32,150
Total	276,111
Total commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	36,655
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	16,379
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	58,845
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	17,460
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	31,224
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,781
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,801
Total	141,490
Total commercial | PPP
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	767,757
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Total	767,757
Total commercial | PPP | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	745,767
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Total	745,767
Total commercial | PPP | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	3,988
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Total	3,988
Total commercial | PPP | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	18,002
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Total	18,002
Total commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	24,045
Financing Receivable, Revolving	2,194,534
Financing Receivable, Year One, Originated, Current Fiscal Year	1,417,548
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,509,575
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,292,938
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	502,962
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	321,471
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	462,394
Total	7,701,422
Total commercial | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	4,628
Financing Receivable, Revolving	2,177,138
Financing Receivable, Year One, Originated, Current Fiscal Year	1,389,260
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,435,519
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,182,302
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	483,957
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	305,998
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	453,734
Total	7,427,908
Total commercial | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	10,159
Financing Receivable, Year One, Originated, Current Fiscal Year	2,719
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39,854
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	37,042
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	113
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	215
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	67
Total	90,169
Total commercial | Commercial and industrial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,565
Financing Receivable, Revolving	7,237
Financing Receivable, Year One, Originated, Current Fiscal Year	19,331
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	28,413
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	56,580
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,269
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,477
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,179
Total	121,487
Total commercial | Commercial and industrial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	16,852
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	6,238
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,789
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	17,014
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	16,623
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,781
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,414
Total	61,859
Total commercial | Commercial real estate - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,150
Financing Receivable, Revolving	21,621
Financing Receivable, Year One, Originated, Current Fiscal Year	191,847
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	221,107
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	128,660
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	102,012
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	152,067
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	83,598
Total	900,912
Total commercial | Commercial real estate - owner occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,150
Financing Receivable, Revolving	18,022
Financing Receivable, Year One, Originated, Current Fiscal Year	185,861
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	209,069
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	128,360
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	99,546
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	147,366
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	79,111
Total	867,335
Total commercial | Commercial real estate - owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	113
Financing Receivable, Year One, Originated, Current Fiscal Year	1,882
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,122
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	300
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	658
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	264
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0
Total	6,339
Total commercial | Commercial real estate - owner occupied | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	3,486
Financing Receivable, Year One, Originated, Current Fiscal Year	4,104
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,916
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,490
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4,437
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,747
Total	26,179
Total commercial | Commercial real estate - owner occupied | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	318
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	740
Total	1,058
Total commercial | Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	25,195
Financing Receivable, Revolving	2,216,154
Financing Receivable, Year One, Originated, Current Fiscal Year	2,377,152
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,730,682
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,421,598
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	604,974
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	473,539
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	545,992
Total	9,370,091
Total commercial | Commercial and business lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	5,778
Financing Receivable, Revolving	2,195,160
Financing Receivable, Year One, Originated, Current Fiscal Year	2,320,888
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,644,588
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,310,662
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	583,503
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	453,364
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	532,845
Total	9,041,009
Total commercial | Commercial and business lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	10,272
Financing Receivable, Year One, Originated, Current Fiscal Year	8,589
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	42,976
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	37,342
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	771
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	479
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	67
Total	100,496
Total commercial | Commercial and business lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	2,565
Financing Receivable, Revolving	10,723
Financing Receivable, Year One, Originated, Current Fiscal Year	41,437
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	37,329
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	56,580
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	3,759
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	10,915
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,926
Total	165,668
Total commercial | Commercial and business lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	16,852
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	6,238
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	5,789
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	17,014
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	16,941
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	8,781
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,154
Total	62,917
Total commercial | Commercial real estate - investor
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	30,774
Financing Receivable, Revolving	172,335
Financing Receivable, Year One, Originated, Current Fiscal Year	1,366,364
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,140,297
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	763,933
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	288,533
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	363,779
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	247,343
Total	4,342,584
Total commercial | Commercial real estate - investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,971
Financing Receivable, Revolving	171,497
Financing Receivable, Year One, Originated, Current Fiscal Year	1,249,644
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	976,332
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	720,237
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	271,987
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	341,658
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	211,360
Total	3,942,714
Total commercial | Commercial real estate - investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	90,235
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	97,333
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,339
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	21,882
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,465
Total	230,254
Total commercial | Commercial real estate - investor | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	838
Financing Receivable, Year One, Originated, Current Fiscal Year	16,343
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,575
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	30,911
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,279
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	239
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	27,209
Total	91,396
Total commercial | Commercial real estate - investor | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	19,803
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	10,141
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	53,056
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	446
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	14,267
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	309
Total	78,220
Total commercial | Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	776
Financing Receivable, Revolving	47,880
Financing Receivable, Year One, Originated, Current Fiscal Year	646,547
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	739,055
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	361,996
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	25,277
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,513
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	17,150
Total	1,840,417
Total commercial | Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	776
Financing Receivable, Revolving	47,880
Financing Receivable, Year One, Originated, Current Fiscal Year	645,925
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	738,561
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	294,910
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	25,219
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2,420
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,768
Total	1,771,682
Total commercial | Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	487
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	494
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	48,283
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	42
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	30
Total	49,336
Total commercial | Real estate construction | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	135
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	18,803
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	93
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	15
Total	19,046
Total commercial | Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	16
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	338
Total	353
Total commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	31,549
Financing Receivable, Revolving	220,215
Financing Receivable, Year One, Originated, Current Fiscal Year	2,012,911
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,879,352
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,125,929
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	313,810
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	366,292
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	264,493
Total	6,183,001
Total commercial | Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	11,746
Financing Receivable, Revolving	219,377
Financing Receivable, Year One, Originated, Current Fiscal Year	1,895,569
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,714,893
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	1,015,146
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	297,205
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	344,078
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	228,127
Total	5,714,396
Total commercial | Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	90,722
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	97,827
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	60,622
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	42
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	21,882
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8,494
Total	279,590
Total commercial | Commercial Real Estate | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	838
Financing Receivable, Year One, Originated, Current Fiscal Year	16,479
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,575
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	49,714
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	2,279
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	332
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	27,224
Total	110,442
Total commercial | Commercial Real Estate | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	19,803
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	10,141
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	53,056
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	446
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	14,283
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	647
Total	78,573
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	12,501
Financing Receivable, Revolving	737,626
Financing Receivable, Year One, Originated, Current Fiscal Year	2,200,487
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,517,417
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	642,218
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,019,128
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	930,816
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,850,939
Total	8,898,632
Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,294
Financing Receivable, Revolving	734,502
Financing Receivable, Year One, Originated, Current Fiscal Year	2,196,822
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,513,865
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	634,897
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,011,539
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	918,785
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,809,561
Total	8,819,971
Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	602
Financing Receivable, Revolving	1,069
Financing Receivable, Year One, Originated, Current Fiscal Year	13
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	410
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	356
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	145
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	137
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,349
Total	3,480
Total consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	1,922
Financing Receivable, Year One, Originated, Current Fiscal Year	1,200
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	689
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	652
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	179
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,174
Total	5,817
Total consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,605
Financing Receivable, Revolving	133
Financing Receivable, Year One, Originated, Current Fiscal Year	2,452
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,454
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	6,313
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,445
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	11,714
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	38,854
Total	69,364
Total consumer | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	2,187,918
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,493,903
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	621,983
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,005,290
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	923,105
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,646,124
Total	7,878,324
Total consumer | Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	2,185,240
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,490,589
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	615,118
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	998,072
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	911,797
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,612,971
Total	7,813,788
Total consumer | Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	355
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	330
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	102
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	126
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	537
Total	1,450
Total consumer | Residential mortgage | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,200
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	689
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	652
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	179
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,028
Total	3,749
Total consumer | Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Year One, Originated, Current Fiscal Year	1,478
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,271
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	5,882
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	7,116
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	11,003
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	31,587
Total	59,337
Total consumer | Home Equity Loan
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	12,421
Financing Receivable, Revolving	572,041
Financing Receivable, Year One, Originated, Current Fiscal Year	3,022
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,141
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	16,216
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,952
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,518
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	84,364
Total	707,255
Total consumer | Home Equity Loan | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	10,224
Financing Receivable, Revolving	569,389
Financing Receivable, Year One, Originated, Current Fiscal Year	2,057
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	12,968
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	15,792
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	11,594
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,803
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	76,165
Total	693,767
Total consumer | Home Equity Loan | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	596
Financing Receivable, Revolving	631
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	14
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	39
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	4
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	804
Total	1,532
Total consumer | Home Equity Loan | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	0
Financing Receivable, Revolving	1,922
Financing Receivable, Year One, Originated, Current Fiscal Year	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	146
Total	2,068
Total consumer | Home Equity Loan | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	1,600
Financing Receivable, Revolving	100
Financing Receivable, Year One, Originated, Current Fiscal Year	965
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	134
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	410
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	319
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	711
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7,249
Total	9,888
Total consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	81
Financing Receivable, Revolving	165,585
Financing Receivable, Year One, Originated, Current Fiscal Year	9,547
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10,374
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	4,019
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,886
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,192
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	120,451
Total	313,054
Total consumer | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	70
Financing Receivable, Revolving	165,114
Financing Receivable, Year One, Originated, Current Fiscal Year	9,525
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10,309
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3,987
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,872
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,185
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	120,425
Total	312,416
Total consumer | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	5
Financing Receivable, Revolving	438
Financing Receivable, Year One, Originated, Current Fiscal Year	13
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	16
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	11
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	7
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	8
Total	498
Total consumer | Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Revolving, Converted to Term Loan	5
Financing Receivable, Revolving	33
Financing Receivable, Year One, Originated, Current Fiscal Year	9
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	49
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	21
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	10
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	18
Total	$ 140

Loans, Credit Quality Indicat_2

Loans, Credit Quality Indicator by Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 24,451,724	$ 22,821,440
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		22,294,939
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		247,022
Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		161,097
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		118,380
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	7,701,422	7,354,594
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		7,118,448
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		79,525
Commercial and industrial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		110,308
Commercial and industrial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		46,312
Commercial real estate - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans	900,912	911,265
Commercial real estate - owner occupied | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		866,193
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		25,115
Commercial real estate - owner occupied | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		19,889
Commercial real estate - owner occupied | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		67
Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Loans	9,370,091	8,265,858
Commercial and business lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		7,984,641
Commercial and business lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		104,641
Commercial and business lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		130,197
Commercial and business lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		46,380
Commercial real estate - investor
Financing Receivable, Recorded Investment [Line Items]
Loans	4,342,584	3,794,517
Commercial real estate - investor | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		3,620,785
Commercial real estate - investor | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		139,873
Commercial real estate - investor | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		29,449
Commercial real estate - investor | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		4,409
Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans	1,840,417	1,420,900
Real estate construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		1,420,374
Real estate construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		33
Real estate construction | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		0
Real estate construction | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		493
Commercial real estate lending
Financing Receivable, Recorded Investment [Line Items]
Loans	6,183,001	5,215,417
Commercial real estate lending | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		5,041,159
Commercial real estate lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		139,906
Commercial real estate lending | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		29,449
Commercial real estate lending | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		4,902
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	15,553,091	13,481,275
Total commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		13,025,800
Total commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		244,547
Total commercial | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		159,646
Total commercial | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		51,282
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	7,878,324	8,136,980
Residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		8,077,122
Residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		563
Residential mortgage | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		1,451
Residential mortgage | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		57,844
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans	707,255	852,025
Home equity | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		841,757
Home equity | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		1,164
Home equity | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		0
Home equity | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		9,104
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	313,054	351,159
Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		350,260
Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		748
Other consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		0
Other consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		152
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 8,898,632	9,340,164
Total consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		9,269,139
Total consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		2,475
Total consumer | Potential Problem
Financing Receivable, Recorded Investment [Line Items]
Loans		1,451
Total consumer | Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 67,099

Loans, Loans by Past Due Status

Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Summarized details of Loans
Current	$ 24,202,209	$ 22,679,696
Financing Receivable, Recorded Investment, Nonaccrual Status	210,854	118,380
Loans	24,451,724	22,821,440
Financing Receivable, Nonaccrual, Interest Income	0
Financing Receivable, Nonaccrual, No Allowance	140,000
30-59 Days Past Due
Summarized details of Loans
Total Past Due	18,077	18,188
60-89 Days Past Due
Summarized details of Loans
Total Past Due	18,985	2,916
90+ Days Past Due
Summarized details of Loans
Total Past Due	1,598	2,259
PPP
Summarized details of Loans
Current	767,757
Financing Receivable, Recorded Investment, Nonaccrual Status	0
Loans	767,757	0
PPP | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0
PPP | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0
PPP | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0
Commercial and industrial
Summarized details of Loans
Current	7,633,269	7,307,118
Financing Receivable, Recorded Investment, Nonaccrual Status	61,859	46,312
Loans	7,701,422	7,354,594
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,819	576
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	3,300	245
Commercial and industrial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	175	342
Commercial real estate - owner occupied
Summarized details of Loans
Current	899,480	909,828
Financing Receivable, Recorded Investment, Nonaccrual Status	1,058	67
Loans	900,912	911,265
Commercial real estate - owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	158	1,369
Commercial real estate - owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	215	0
Commercial real estate - owner occupied | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial and business lending
Summarized details of Loans
Current	9,300,506	8,216,947
Financing Receivable, Recorded Investment, Nonaccrual Status	62,917	46,380
Loans	9,370,091	8,265,858
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,977	1,945
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	3,516	245
Commercial and business lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	175	342
Commercial real estate - investor
Summarized details of Loans
Current	4,251,571	3,788,296
Financing Receivable, Recorded Investment, Nonaccrual Status	78,220	4,409
Loans	4,342,584	3,794,517
Commercial real estate - investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,024	1,812
Commercial real estate - investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	11,769	0
Commercial real estate - investor | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Real estate construction
Summarized details of Loans
Current	1,839,073	1,420,310
Financing Receivable, Recorded Investment, Nonaccrual Status	353	493
Loans	1,840,417	1,420,900
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	991	64
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	33
Real estate construction | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial real estate lending
Summarized details of Loans
Current	6,090,644	5,208,606
Financing Receivable, Recorded Investment, Nonaccrual Status	78,573	4,902
Loans	6,183,001	5,215,417
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,015	1,876
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	11,769	33
Commercial real estate lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Total commercial
Summarized details of Loans
Current	15,391,150	13,425,552
Financing Receivable, Recorded Investment, Nonaccrual Status	141,490	51,282
Loans	15,553,091	13,481,275
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	4,992	3,821
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	15,284	278
Total commercial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	175	342
Residential mortgage
Summarized details of Loans
Current	7,808,294	8,069,863
Financing Receivable, Recorded Investment, Nonaccrual Status	59,337	57,844
Loans	7,878,324	8,136,980
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	8,975	8,749
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,410	525
Residential mortgage | 90+ Days Past Due
Summarized details of Loans
Total Past Due	308	0
Home equity
Summarized details of Loans
Current	692,565	837,274
Financing Receivable, Recorded Investment, Nonaccrual Status	9,888	9,104
Loans	707,255	852,025
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,071	4,483
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,731	1,164
Home equity | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Other consumer
Summarized details of Loans
Current	310,200	347,007
Financing Receivable, Recorded Investment, Nonaccrual Status	140	152
Loans	313,054	351,159
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,039	1,135
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	560	949
Other consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	1,115	1,917
Total consumer
Summarized details of Loans
Current	8,811,060	9,254,144
Financing Receivable, Recorded Investment, Nonaccrual Status	69,364	67,099
Loans	8,898,632	9,340,164
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	13,085	14,366
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	3,701	2,638
Total consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	$ 1,423	$ 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]
Impaired Financing Receivable, Recorded Investment	$ 110,043
Impaired Financing Receivable, Unpaid Principal Balance	148,020
Impaired Financing Receivable, Related Allowance	16,165
Impaired Financing Receivable, Average Recorded Investment	113,697
Interest Income Recognized	$ 3,628
Net Recorded Investment of the Impaired Loans	63.00%
Bank Mutual [Member]
Loan and Lease Receivables, Impaired [Abstract]
purchased credit-impaired loans	$ 2,000
Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	76,102
Impaired Financing Receivable, Unpaid Principal Balance	95,033
Impaired Financing Receivable, Related Allowance	16,165
Impaired Financing Receivable, Average Recorded Investment	77,235
Interest Income Recognized	3,012
Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	33,941
Impaired Financing Receivable, Unpaid Principal Balance	52,987
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	36,462
Interest Income Recognized	616
Commercial and industrial
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	62,035
Impaired Financing Receivable, Unpaid Principal Balance	96,784
Impaired Financing Receivable, Related Allowance	12,010
Impaired Financing Receivable, Average Recorded Investment	65,792
Interest Income Recognized	1,895
Commercial and industrial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	47,249
Impaired Financing Receivable, Unpaid Principal Balance	63,346
Impaired Financing Receivable, Related Allowance	12,010
Impaired Financing Receivable, Average Recorded Investment	45,290
Interest Income Recognized	1,832
Commercial and industrial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	14,787
Impaired Financing Receivable, Unpaid Principal Balance	33,438
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	20,502
Interest Income Recognized	63
Commercial real estate - owner occupied
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	1,676
Impaired Financing Receivable, Unpaid Principal Balance	1,682
Impaired Financing Receivable, Related Allowance	19
Impaired Financing Receivable, 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]
Impaired Financing Receivable, Recorded Investment	1,676
Impaired Financing Receivable, Unpaid Principal Balance	1,682
Impaired Financing Receivable, Related Allowance	19
Impaired Financing Receivable, 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]
Impaired Financing Receivable, Recorded Investment	0
Impaired Financing Receivable, Unpaid Principal Balance	0
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	0
Interest Income Recognized	0
Commercial and business lending
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	63,711
Impaired Financing Receivable, Unpaid Principal Balance	98,466
Impaired Financing Receivable, Related Allowance	12,029
Impaired Financing Receivable, 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]
Impaired Financing Receivable, Recorded Investment	48,924
Impaired Financing Receivable, Unpaid Principal Balance	65,028
Impaired Financing Receivable, Related Allowance	12,029
Impaired Financing Receivable, 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]
Impaired Financing Receivable, Recorded Investment	14,787
Impaired Financing Receivable, Unpaid Principal Balance	33,438
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	20,502
Interest Income Recognized	63
Commercial real estate - investor
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	4,633
Impaired Financing Receivable, Unpaid Principal Balance	5,808
Impaired Financing Receivable, Related Allowance	15
Impaired Financing Receivable, Average Recorded Investment	4,931
Interest Income Recognized	174
Commercial real estate - investor | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	928
Impaired Financing Receivable, Unpaid Principal Balance	2,104
Impaired Financing Receivable, Related Allowance	15
Impaired Financing Receivable, Average Recorded Investment	950
Interest Income Recognized	15
Commercial real estate - investor | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	3,705
Impaired Financing Receivable, Unpaid Principal Balance	3,705
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	3,980
Interest Income Recognized	159
Real estate construction
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	477
Impaired Financing Receivable, Unpaid Principal Balance	559
Impaired Financing Receivable, Related Allowance	67
Impaired Financing Receivable, Average Recorded Investment	494
Interest Income Recognized	30
Real estate construction | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	477
Impaired Financing Receivable, Unpaid Principal Balance	559
Impaired Financing Receivable, Related Allowance	67
Impaired Financing Receivable, Average Recorded Investment	494
Interest Income Recognized	30
Real estate construction | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	0
Impaired Financing Receivable, Unpaid Principal Balance	0
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	0
Interest Income Recognized	0
Commercial real estate lending
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	5,110
Impaired Financing Receivable, Unpaid Principal Balance	6,367
Impaired Financing Receivable, Related Allowance	82
Impaired Financing Receivable, Average Recorded Investment	5,425
Interest Income Recognized	204
Commercial real estate lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	1,405
Impaired Financing Receivable, Unpaid Principal Balance	2,663
Impaired Financing Receivable, Related Allowance	82
Impaired Financing Receivable, Average Recorded Investment	1,445
Interest Income Recognized	45
Commercial real estate lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	3,705
Impaired Financing Receivable, Unpaid Principal Balance	3,705
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	3,980
Interest Income Recognized	159
Total commercial
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	68,820
Impaired Financing Receivable, Unpaid Principal Balance	104,833
Impaired Financing Receivable, Related Allowance	12,111
Impaired Financing Receivable, Average Recorded Investment	72,991
Interest Income Recognized	2,186
Total commercial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	50,329
Impaired Financing Receivable, Unpaid Principal Balance	67,691
Impaired Financing Receivable, Related Allowance	12,111
Impaired Financing Receivable, Average Recorded Investment	48,509
Interest Income Recognized	1,965
Total commercial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	18,491
Impaired Financing Receivable, Unpaid Principal Balance	37,142
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	24,482
Interest Income Recognized	222
Residential mortgage
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	35,554
Impaired Financing Receivable, Unpaid Principal Balance	37,087
Impaired Financing Receivable, Related Allowance	2,740
Impaired Financing Receivable, Average Recorded Investment	34,683
Interest Income Recognized	1,229
Residential mortgage | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	21,450
Impaired Financing Receivable, Unpaid Principal Balance	22,625
Impaired Financing Receivable, Related Allowance	2,740
Impaired Financing Receivable, Average Recorded Investment	23,721
Interest Income Recognized	856
Residential mortgage | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	14,104
Impaired Financing Receivable, Unpaid Principal Balance	14,461
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	10,962
Interest Income Recognized	373
Home equity
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	4,422
Impaired Financing Receivable, Unpaid Principal Balance	4,851
Impaired Financing Receivable, Related Allowance	1,190
Impaired Financing Receivable, Average Recorded Investment	4,773
Interest Income Recognized	211
Home equity | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	3,076
Impaired Financing Receivable, Unpaid Principal Balance	3,468
Impaired Financing Receivable, Related Allowance	1,190
Impaired Financing Receivable, Average Recorded Investment	3,756
Interest Income Recognized	191
Home equity | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	1,346
Impaired Financing Receivable, Unpaid Principal Balance	1,383
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	1,017
Interest Income Recognized	21
Other consumer
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	1,247
Impaired Financing Receivable, Unpaid Principal Balance	1,249
Impaired Financing Receivable, Related Allowance	125
Impaired Financing Receivable, Average Recorded Investment	1,250
Interest Income Recognized	1
Other consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	1,247
Impaired Financing Receivable, Unpaid Principal Balance	1,249
Impaired Financing Receivable, Related Allowance	125
Impaired Financing Receivable, Average Recorded Investment	1,250
Interest Income Recognized	1
Other consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	0
Impaired Financing Receivable, Unpaid Principal Balance	0
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	0
Interest Income Recognized	0
Total consumer
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	41,223
Impaired Financing Receivable, Unpaid Principal Balance	43,187
Impaired Financing Receivable, Related Allowance	4,055
Impaired Financing Receivable, Average Recorded Investment	40,706
Interest Income Recognized	1,441
Total consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	25,773
Impaired Financing Receivable, Unpaid Principal Balance	27,342
Impaired Financing Receivable, Related Allowance	4,055
Impaired Financing Receivable, Average Recorded Investment	28,726
Interest Income Recognized	1,047
Total consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Impaired Financing Receivable, Recorded Investment	15,450
Impaired Financing Receivable, Unpaid Principal Balance	15,845
Impaired Financing Receivable, Related Allowance	0
Impaired Financing Receivable, Average Recorded Investment	11,979
Interest Income Recognized	$ 394

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 52,092	$ 26,041	$ 53,263
Nonaccrual Restructured Loans	20,190	22,494	26,292
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	12,713	16,678	25,478
Nonaccrual Restructured Loans	6,967	7,376	249
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,711	1,676	2,080
Nonaccrual Restructured Loans	0	0	0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	26,435	293	799
Nonaccrual Restructured Loans	225	0	933
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	260	298	311
Nonaccrual Restructured Loans	111	179	198
Residential mortgage
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,825	3,955	16,036
Nonaccrual Restructured Loans	11,509	13,035	22,279
Home equity
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,957	1,896	7,385
Nonaccrual Restructured Loans	1,379	1,904	2,627
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	1,191	1,246	1,174
Nonaccrual Restructured Loans	$ 0	$ 1	$ 6

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	77	85	86
Recorded Investment(a)	$ 36,154	$ 15,940	$ 11,429
Unpaid Principal Balance(b)	$ 37,125	$ 16,150	$ 11,792
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	6	5
Recorded Investment(a)	$ 1,823	$ 7,588	$ 1,315
Unpaid Principal Balance(b)	$ 2,059	$ 7,703	$ 1,330
Commercial real estate - owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	0	0
Recorded Investment(a)	$ 658	$ 0	$ 0
Unpaid Principal Balance(b)	$ 689	$ 0	$ 0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	10	0	2
Recorded Investment(a)	$ 26,563	$ 0	$ 1,393
Unpaid Principal Balance(b)	$ 26,567	$ 0	$ 1,472
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	1
Recorded Investment(a)	$ 0	$ 77	$ 78
Unpaid Principal Balance(b)	$ 0	$ 77	$ 80
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	36	53	41
Recorded Investment(a)	$ 6,031	$ 7,436	$ 6,977
Unpaid Principal Balance(b)	$ 6,113	$ 7,517	$ 7,210
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	20	24	34
Recorded Investment(a)	$ 1,078	$ 831	$ 1,649
Unpaid Principal Balance(b)	$ 1,697	$ 845	$ 1,681
Other consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	3
Recorded Investment(a)	$ 0	$ 8	$ 17
Unpaid Principal Balance(b)	$ 0	$ 8	$ 19

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	9	66	55
Recorded Investment | $	$ 1,244	$ 6,959	$ 5,241
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	3
Recorded Investment | $	$ 0	$ 0	$ 0
Commercial real estate - investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	0
Recorded Investment | $	$ 0	$ 461	$ 0
Residential mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	38	20
Recorded Investment | $	$ 1,036	$ 5,630	$ 3,553
Home equity
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	27	32
Recorded Investment | $	$ 208	$ 868	$ 1,688

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Jan. 01, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	$ 201,371
Financing Receivable, Allowance for Credit Loss	201,371	$ 201,371
Net Charge offs		(55,152)
Financing Receivable, Allowance for Credit Loss, Ending Balance		201,371
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	21,907
Cumulative effect of ASU 2016-13 adoption (CECL)	47,776	21,907		$ 47,776
Provision for credit losses	7,000
Balance at end of period	47,776	21,907
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(55,152)
Provision for credit losses	174,006	16,000	$ 0
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	201,371	238,023
Recoveries		19,161
Net charge offs		55,152
Provision for loan losses		18,500
Balance at end of period	383,702	201,371	238,023
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss					$ 131,147
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss					354,425
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					40,597
First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	179
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					18,690
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		(51,441)
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(51,441)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	91,133	108,835
Recoveries		11,875
Net charge offs		51,441
Provision for loan losses		33,738
Balance at end of period		91,133	108,835
Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		2,573
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		2,573
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	10,284	9,255
Recoveries		2,795
Net charge offs		(2,573)
Provision for loan losses		(1,543)
Balance at end of period		10,284	9,255
Commercial and business lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		(48,868)
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(48,868)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	101,417	118,090
Recoveries		14,670
Net charge offs		48,868
Provision for loan losses		32,195
Balance at end of period		101,417	118,090
Commercial real estate - investor
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		31
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		31
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	40,514	40,844
Recoveries		31
Net charge offs		(31)
Provision for loan losses		(361)
Balance at end of period		40,514	40,844
Real estate construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		243
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		243
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	24,915	28,240
Recoveries		302
Net charge offs		(243)
Provision for loan losses		(3,568)
Balance at end of period		24,915	28,240
Commercial real estate lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		274
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		274
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	65,428	69,084
Recoveries		333
Net charge offs		(274)
Provision for loan losses		(3,929)
Balance at end of period		65,428	69,084
Total commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		(48,594)
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(48,594)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	166,846	187,174
Recoveries		15,003
Net charge offs		48,594
Provision for loan losses		28,266
Balance at end of period		166,846	187,174
Residential mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		(2,630)
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(2,630)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	16,960	25,595
Recoveries		692
Net charge offs		2,630
Provision for loan losses		(6,005)
Balance at end of period		16,960	25,595
Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		753
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		753
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	10,926	19,266
Recoveries		2,599
Net charge offs		(753)
Provision for loan losses		(9,093)
Balance at end of period		10,926	19,266
Other consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		(4,681)
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(4,681)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	6,639	5,988
Recoveries		868
Net charge offs		4,681
Provision for loan losses		5,332
Balance at end of period		6,639	5,988
Total consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Net Charge offs		(6,558)
Allowance for Credit Losses on Loans [Abstract]
Net Charge offs		(6,558)
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	34,525	50,849
Recoveries		4,158
Net charge offs		6,558
Provision for loan losses		(9,766)
Balance at end of period		34,525	$ 50,849
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	201,371
Financing Receivable, Allowance for Credit Loss	383,702	201,371		383,702
Financing Receivable, Allowance for Credit Loss, Writeoff	112,053	74,313
Financing Receivable, Allowance for Credit Loss, Recovery	11,422
Net Charge offs	(100,631)
Gross up of allowance for PCD loans at acquistion	3,504
Provision for loan losses	164,457
Financing Receivable, Allowance for Credit Loss, Ending Balance	383,702	201,371
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	11,422
Net Charge offs	(100,631)
Gross up of allowance for PCD loans at acquistion	3,504
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(112,053)	(74,313)
Net charge offs	100,631
Allowance for Loan Losses [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	313,828			313,828
Financing Receivable, Allowance for Credit Loss, Ending Balance	313,828
Allowance for Loan Losses [Member] | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	2,543
Allowance for Loan Losses [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	112,457			112,457	112,000
Financing Receivable, Allowance for Credit Loss, Ending Balance	112,457
Allowance for Loan Losses [Member] | PPP
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	0
Financing Receivable, Allowance for Credit Loss	531	0		531
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Financing Receivable, Allowance for Credit Loss, Recovery	0
Net Charge offs	0
Gross up of allowance for PCD loans at acquistion	0
Provision for loan losses	531
Financing Receivable, Allowance for Credit Loss, Ending Balance	531	0
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	0
Net Charge offs	0
Gross up of allowance for PCD loans at acquistion	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 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	0			0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0
Allowance for Loan Losses [Member] | PPP | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	0
Allowance for Loan Losses [Member] | PPP | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	0			0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	91,133
Financing Receivable, Allowance for Credit Loss	142,793	91,133		142,793
Financing Receivable, Allowance for Credit Loss, Writeoff	80,320	63,315
Financing Receivable, Allowance for Credit Loss, Recovery	7,004
Net Charge offs	(73,316)
Gross up of allowance for PCD loans at acquistion	293
Provision for loan losses	71,355
Financing Receivable, Allowance for Credit Loss, Ending Balance	142,793	91,133
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	7,004
Net Charge offs	(73,316)
Gross up of allowance for PCD loans at acquistion	293
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(80,320)	(63,315)
Net charge offs	73,316
Allowance for Loan Losses [Member] | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	144,052			144,052
Financing Receivable, Allowance for Credit Loss, Ending Balance	144,052
Allowance for Loan Losses [Member] | Commercial and industrial | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	408
Allowance for Loan Losses [Member] | Commercial and industrial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	52,919			52,919
Financing Receivable, Allowance for Credit Loss, Ending Balance	52,919
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	10,284
Financing Receivable, Allowance for Credit Loss	11,274	10,284		11,274
Financing Receivable, Allowance for Credit Loss, Writeoff	419	222
Financing Receivable, Allowance for Credit Loss, Recovery	147
Net Charge offs	(272)
Gross up of allowance for PCD loans at acquistion	890
Provision for loan losses	1,967
Financing Receivable, Allowance for Credit Loss, Ending Balance	11,274	10,284
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	147
Net Charge offs	(272)
Gross up of allowance for PCD loans at acquistion	890
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(419)	(222)
Net charge offs	272
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	8,433			8,433
Financing Receivable, Allowance for Credit Loss, Ending Balance	8,433
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	255
Allowance for Loan Losses [Member] | Commercial real estate - owner occupied | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	(1,851)			(1,851)
Financing Receivable, Allowance for Credit Loss, Ending Balance	(1,851)
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	101,417
Financing Receivable, Allowance for Credit Loss	154,598	101,417		154,598
Financing Receivable, Allowance for Credit Loss, Writeoff	80,739	63,537
Financing Receivable, Allowance for Credit Loss, Recovery	7,151
Net Charge offs	(73,588)
Gross up of allowance for PCD loans at acquistion	1,183
Provision for loan losses	73,853
Financing Receivable, Allowance for Credit Loss, Ending Balance	154,598	101,417
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	7,151
Net Charge offs	(73,588)
Gross up of allowance for PCD loans at acquistion	1,183
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(80,739)	(63,537)
Net charge offs	73,588
Allowance for Loan Losses [Member] | Commercial and business lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	152,485			152,485
Financing Receivable, Allowance for Credit Loss, Ending Balance	152,485
Allowance for Loan Losses [Member] | Commercial and business lending | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	663
Allowance for Loan Losses [Member] | Commercial and business lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	51,068			51,068
Financing Receivable, Allowance for Credit Loss, Ending Balance	51,068
Allowance for Loan Losses [Member] | Commercial real estate - investor
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	40,514
Financing Receivable, Allowance for Credit Loss	93,435	40,514		93,435
Financing Receivable, Allowance for Credit Loss, Writeoff	22,920	0
Financing Receivable, Allowance for Credit Loss, Recovery	643
Net Charge offs	(22,277)
Gross up of allowance for PCD loans at acquistion	753
Provision for loan losses	71,933
Financing Receivable, Allowance for Credit Loss, Ending Balance	93,435	40,514
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	643
Net Charge offs	(22,277)
Gross up of allowance for PCD loans at acquistion	753
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(22,920)	0
Net charge offs	22,277
Allowance for Loan Losses [Member] | Commercial real estate - investor | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	42,555			42,555
Financing Receivable, Allowance for Credit Loss, Ending Balance	42,555
Allowance for Loan Losses [Member] | Commercial real estate - investor | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	472
Allowance for Loan Losses [Member] | Commercial real estate - investor | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	2,041			2,041
Financing Receivable, Allowance for Credit Loss, Ending Balance	2,041
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	24,915
Financing Receivable, Allowance for Credit Loss	59,193	24,915		59,193
Financing Receivable, Allowance for Credit Loss, Writeoff	19	60
Financing Receivable, Allowance for Credit Loss, Recovery	49
Net Charge offs	31
Gross up of allowance for PCD loans at acquistion	435
Provision for loan losses	25,854
Financing Receivable, Allowance for Credit Loss, Ending Balance	59,193	24,915
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	49
Net Charge offs	31
Gross up of allowance for PCD loans at acquistion	435
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(19)	(60)
Net charge offs	(31)
Allowance for Loan Losses [Member] | Real estate construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	32,382			32,382
Financing Receivable, Allowance for Credit Loss, Ending Balance	32,382
Allowance for Loan Losses [Member] | Real estate construction | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	492
Allowance for Loan Losses [Member] | Real estate construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	7,467			7,467
Financing Receivable, Allowance for Credit Loss, Ending Balance	7,467
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	65,428
Financing Receivable, Allowance for Credit Loss	152,629	65,428		152,629
Financing Receivable, Allowance for Credit Loss, Writeoff	22,938	60
Financing Receivable, Allowance for Credit Loss, Recovery	692
Net Charge offs	(22,246)
Gross up of allowance for PCD loans at acquistion	1,188
Provision for loan losses	97,787
Financing Receivable, Allowance for Credit Loss, Ending Balance	152,629	65,428
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	692
Net Charge offs	(22,246)
Gross up of allowance for PCD loans at acquistion	1,188
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(22,938)	(60)
Net charge offs	22,246
Allowance for Loan Losses [Member] | Commercial real estate lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	74,937			74,937
Financing Receivable, Allowance for Credit Loss, Ending Balance	74,937
Allowance for Loan Losses [Member] | Commercial real estate lending | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	964
Allowance for Loan Losses [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	9,508			9,508
Financing Receivable, Allowance for Credit Loss, Ending Balance	9,508
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	166,846
Financing Receivable, Allowance for Credit Loss	307,226	166,846		307,226
Financing Receivable, Allowance for Credit Loss, Writeoff	103,677	63,597
Financing Receivable, Allowance for Credit Loss, Recovery	7,844
Net Charge offs	(95,834)
Gross up of allowance for PCD loans at acquistion	2,371
Provision for loan losses	171,641
Financing Receivable, Allowance for Credit Loss, Ending Balance	307,226	166,846
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	7,844
Net Charge offs	(95,834)
Gross up of allowance for PCD loans at acquistion	2,371
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(103,677)	(63,597)
Net charge offs	95,834
Allowance for Loan Losses [Member] | Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	227,422			227,422
Financing Receivable, Allowance for Credit Loss, Ending Balance	227,422
Allowance for Loan Losses [Member] | Total commercial | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	1,627
Allowance for Loan Losses [Member] | Total commercial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	60,576			60,576
Financing Receivable, Allowance for Credit Loss, Ending Balance	60,576
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	16,960
Financing Receivable, Allowance for Credit Loss	42,996	16,960		42,996
Financing Receivable, Allowance for Credit Loss, Writeoff	1,867	3,322
Financing Receivable, Allowance for Credit Loss, Recovery	500
Net Charge offs	(1,367)
Gross up of allowance for PCD loans at acquistion	651
Provision for loan losses	(6,864)
Financing Receivable, Allowance for Credit Loss, Ending Balance	42,996	16,960
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	500
Net Charge offs	(1,367)
Gross up of allowance for PCD loans at acquistion	651
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(1,867)	(3,322)
Net charge offs	1,367
Allowance for Loan Losses [Member] | Residential mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	50,175			50,175
Financing Receivable, Allowance for Credit Loss, Ending Balance	50,175
Allowance for Loan Losses [Member] | Residential mortgage | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	403
Allowance for Loan Losses [Member] | Residential mortgage | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	33,215			33,215
Financing Receivable, Allowance for Credit Loss, Ending Balance	33,215
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	10,926
Financing Receivable, Allowance for Credit Loss	18,849	10,926		18,849
Financing Receivable, Allowance for Credit Loss, Writeoff	1,719	1,846
Financing Receivable, Allowance for Credit Loss, Recovery	1,978
Net Charge offs	259
Gross up of allowance for PCD loans at acquistion	422
Provision for loan losses	(4,781)
Financing Receivable, Allowance for Credit Loss, Ending Balance	18,849	10,926
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	1,978
Net Charge offs	259
Gross up of allowance for PCD loans at acquistion	422
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(1,719)	(1,846)
Net charge offs	(259)
Allowance for Loan Losses [Member] | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	22,575			22,575
Financing Receivable, Allowance for Credit Loss, Ending Balance	22,575
Allowance for Loan Losses [Member] | Home equity | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	374
Allowance for Loan Losses [Member] | Home equity | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	11,649			11,649
Financing Receivable, Allowance for Credit Loss, Ending Balance	11,649
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	6,639
Financing Receivable, Allowance for Credit Loss	14,630	6,639		14,630
Financing Receivable, Allowance for Credit Loss, Writeoff	4,790	5,548
Financing Receivable, Allowance for Credit Loss, Recovery	1,101
Net Charge offs	(3,689)
Gross up of allowance for PCD loans at acquistion	61
Provision for loan losses	4,462
Financing Receivable, Allowance for Credit Loss, Ending Balance	14,630	6,639
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	1,101
Net Charge offs	(3,689)
Gross up of allowance for PCD loans at acquistion	61
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(4,790)	(5,548)
Net charge offs	3,689
Allowance for Loan Losses [Member] | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	13,655			13,655
Financing Receivable, Allowance for Credit Loss, Ending Balance	13,655
Allowance for Loan Losses [Member] | Other consumer | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	140
Allowance for Loan Losses [Member] | Other consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	7,016			7,016
Financing Receivable, Allowance for Credit Loss, Ending Balance	7,016
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Beginning Balance	34,525
Financing Receivable, Allowance for Credit Loss	76,475	34,525		76,475
Financing Receivable, Allowance for Credit Loss, Writeoff	8,376	10,716
Financing Receivable, Allowance for Credit Loss, Recovery	3,579
Net Charge offs	(4,797)
Gross up of allowance for PCD loans at acquistion	1,134
Provision for loan losses	(7,183)
Financing Receivable, Allowance for Credit Loss, Ending Balance	76,475	34,525
Allowance for Credit Losses on Loans [Abstract]
Financing Receivable, Allowance for Credit Loss, Recovery	3,579
Net Charge offs	(4,797)
Gross up of allowance for PCD loans at acquistion	1,134
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(8,376)	(10,716)
Net charge offs	4,797
Allowance for Loan Losses [Member] | Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	86,405			86,405
Financing Receivable, Allowance for Credit Loss, Ending Balance	86,405
Allowance for Loan Losses [Member] | Total consumer | First Staunton Bancshares
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for loan losses	917
Allowance for Loan Losses [Member] | Total consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss	51,880			51,880
Financing Receivable, Allowance for Credit Loss, Ending Balance	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
Cumulative effect of ASU 2016-13 adoption (CECL)	47,776	21,907		47,776
Provision for credit losses	7,000
Balance at end of period	47,776	21,907
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					40,597
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	179
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	18,690			18,690	19,000
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	22,311	12,276		22,311
Provision for credit losses	13,972
Balance at end of period	22,311	12,276
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					8,278
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	61
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	(3,998)			(3,998)
Balance at end of period	(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
Cumulative effect of ASU 2016-13 adoption (CECL)	266	127		266
Provision for credit losses	135
Balance at end of period	266	127
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - owner occupied | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					127
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - owner occupied | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	4
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - owner occupied | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	0			0
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	22,577	12,403		22,577
Provision for credit losses	14,108
Balance at end of period	22,577	12,403
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					8,405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	65
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	(3,998)			(3,998)
Balance at end of period	(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
Cumulative effect of ASU 2016-13 adoption (CECL)	636	530		636
Provision for credit losses	(141)
Balance at end of period	636	530
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - investor | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - investor | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	2
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate - investor | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	246			246
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	18,886	7,532		18,886
Provision for credit losses	(7,038)
Balance at end of period	18,886	7,532
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					25,879
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	45
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	18,347			18,347
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	19,522	8,062		19,522
Provision for credit losses	(7,179)
Balance at end of period	19,522	8,062
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					26,655
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	47
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	18,593			18,593
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	42,099	20,465		42,099
Provision for credit losses	6,929
Balance at end of period	42,099	20,465
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					35,060
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	112
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	14,595			14,595
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	3,118	1,038		3,118
Provision for credit losses	(577)
Balance at end of period	3,118	1,038
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					3,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	2,591			2,591
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	2,557	405		2,557
Provision for credit losses	649
Balance at end of period	2,557	405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					1,909
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	1,504			1,504
Balance at end of period	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
Cumulative effect of ASU 2016-13 adoption (CECL)	5,676	1,443		5,676
Provision for credit losses	72
Balance at end of period	5,676	1,443
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)					5,538
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)	4,095			4,095
Balance at end of period	4,095
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	112,053
Financing Receivable, Allowance for Credit Loss, Recovery	11,422
Net Charge offs	(100,631)
Gross up of allowance for PCD loans at acquistion	3,504
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	223,278
allowance for credit losses on loans	431,478	223,278		$ 431,478
Financing Receivable, Allowance for Credit Loss, Recovery	11,422
Net Charge offs	(100,631)
Gross up of allowance for PCD loans at acquistion	3,504
Provision for credit losses	171,457
Balance at end of period	431,478	223,278
Percent of Loans				1.76%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(112,053)
Net charge offs	100,631
Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					354,425
Allowance for Loans Losses and Unfunded Commitments [Member] | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	2,722
Allowance for Loans Losses and Unfunded Commitments [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss					131,000
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	131,147			$ 131,147
Balance at end of period	131,147
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	0
Financing Receivable, Allowance for Credit Loss, Recovery	0
Net Charge offs	0
Gross up of allowance for PCD loans at acquistion	0
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	0
allowance for credit losses on loans	531	0		$ 531
Financing Receivable, Allowance for Credit Loss, Recovery	0
Net Charge offs	0
Gross up of allowance for PCD loans at acquistion	0
Provision for credit losses	531
Balance at end of period	531	0
Percent of Loans				0.07%
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 [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	0			$ 0
Balance at end of period	0
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	80,320
Financing Receivable, Allowance for Credit Loss, Recovery	7,004
Net Charge offs	(73,316)
Gross up of allowance for PCD loans at acquistion	293
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	103,409
allowance for credit losses on loans	165,105	103,409		$ 165,105
Financing Receivable, Allowance for Credit Loss, Recovery	7,004
Net Charge offs	(73,316)
Gross up of allowance for PCD loans at acquistion	293
Provision for credit losses	85,327
Balance at end of period	165,105	103,409
Percent of Loans				2.14%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(80,320)
Net charge offs	73,316
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					152,330
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	469
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	48,921			$ 48,921
Balance at end of period	48,921
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	419
Financing Receivable, Allowance for Credit Loss, Recovery	147
Net Charge offs	(272)
Gross up of allowance for PCD loans at acquistion	890
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	10,411
allowance for credit losses on loans	11,539	10,411		$ 11,539
Financing Receivable, Allowance for Credit Loss, Recovery	147
Net Charge offs	(272)
Gross up of allowance for PCD loans at acquistion	890
Provision for credit losses	2,102
Balance at end of period	11,539	10,411
Percent of Loans				1.28%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(419)
Net charge offs	272
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					8,560
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	259
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - owner occupied | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	(1,851)			$ (1,851)
Balance at end of period	(1,851)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	80,739
Financing Receivable, Allowance for Credit Loss, Recovery	7,151
Net Charge offs	(73,588)
Gross up of allowance for PCD loans at acquistion	1,183
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	113,820
allowance for credit losses on loans	177,175	113,820		$ 177,175
Financing Receivable, Allowance for Credit Loss, Recovery	7,151
Net Charge offs	(73,588)
Gross up of allowance for PCD loans at acquistion	1,183
Provision for credit losses	87,961
Balance at end of period	177,175	113,820
Percent of Loans				1.89%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(80,739)
Net charge offs	73,588
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					160,890
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	728
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	47,070			$ 47,070
Balance at end of period	47,070
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	22,920
Financing Receivable, Allowance for Credit Loss, Recovery	643
Net Charge offs	(22,277)
Gross up of allowance for PCD loans at acquistion	753
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	41,044
allowance for credit losses on loans	94,071	41,044		$ 94,071
Financing Receivable, Allowance for Credit Loss, Recovery	643
Net Charge offs	(22,277)
Gross up of allowance for PCD loans at acquistion	753
Provision for credit losses	71,792
Balance at end of period	94,071	41,044
Percent of Loans				2.17%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(22,920)
Net charge offs	22,277
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					43,331
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	474
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate - investor | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	2,287			$ 2,287
Balance at end of period	2,287
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	19
Financing Receivable, Allowance for Credit Loss, Recovery	49
Net Charge offs	31
Gross up of allowance for PCD loans at acquistion	435
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	32,447
allowance for credit losses on loans	78,079	32,447		$ 78,079
Financing Receivable, Allowance for Credit Loss, Recovery	49
Net Charge offs	31
Gross up of allowance for PCD loans at acquistion	435
Provision for credit losses	18,816
Balance at end of period	78,079	32,447
Percent of Loans				4.24%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(19)
Net charge offs	(31)
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					58,261
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	537
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	25,814			$ 25,814
Balance at end of period	25,814
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	22,938
Financing Receivable, Allowance for Credit Loss, Recovery	692
Net Charge offs	(22,246)
Gross up of allowance for PCD loans at acquistion	1,188
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	73,490
allowance for credit losses on loans	172,151	73,490		$ 172,151
Financing Receivable, Allowance for Credit Loss, Recovery	692
Net Charge offs	(22,246)
Gross up of allowance for PCD loans at acquistion	1,188
Provision for credit losses	90,608
Balance at end of period	172,151	73,490
Percent of Loans				2.78%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(22,938)
Net charge offs	22,246
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					101,591
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	1,011
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	28,101			$ 28,101
Balance at end of period	28,101
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	103,677
Financing Receivable, Allowance for Credit Loss, Recovery	7,844
Net Charge offs	(95,834)
Gross up of allowance for PCD loans at acquistion	2,371
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	187,311
allowance for credit losses on loans	349,326	187,311		$ 349,326
Financing Receivable, Allowance for Credit Loss, Recovery	7,844
Net Charge offs	(95,834)
Gross up of allowance for PCD loans at acquistion	2,371
Provision for credit losses	178,569
Balance at end of period	349,326	187,311
Percent of Loans				2.25%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(103,677)
Net charge offs	95,834
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					262,482
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	1,739
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	75,171			$ 75,171
Balance at end of period	75,171
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	1,867
Financing Receivable, Allowance for Credit Loss, Recovery	500
Net Charge offs	(1,367)
Gross up of allowance for PCD loans at acquistion	651
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	16,960
allowance for credit losses on loans	42,997	16,960		$ 42,997
Financing Receivable, Allowance for Credit Loss, Recovery	500
Net Charge offs	(1,367)
Gross up of allowance for PCD loans at acquistion	651
Provision for credit losses	6,865
Balance at end of period	42,997	16,960
Percent of Loans				0.55%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(1,867)
Net charge offs	1,367
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					50,175
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	403
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	33,215			$ 33,215
Balance at end of period	33,215
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	1,719
Financing Receivable, Allowance for Credit Loss, Recovery	1,978
Net Charge offs	259
Gross up of allowance for PCD loans at acquistion	422
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	11,964
allowance for credit losses on loans	21,967	11,964		$ 21,967
Financing Receivable, Allowance for Credit Loss, Recovery	1,978
Net Charge offs	259
Gross up of allowance for PCD loans at acquistion	422
Provision for credit losses	5,358
Balance at end of period	21,967	11,964
Percent of Loans				3.11%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(1,719)
Net charge offs	(259)
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					26,204
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	440
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	14,240			$ 14,240
Balance at end of period	14,240
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	4,790
Financing Receivable, Allowance for Credit Loss, Recovery	1,101
Net Charge offs	(3,689)
Gross up of allowance for PCD loans at acquistion	61
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	7,044
allowance for credit losses on loans	17,187	7,044		$ 17,187
Financing Receivable, Allowance for Credit Loss, Recovery	1,101
Net Charge offs	(3,689)
Gross up of allowance for PCD loans at acquistion	61
Provision for credit losses	5,111
Balance at end of period	17,187	7,044
Percent of Loans				5.49%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(4,790)
Net charge offs	3,689
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					15,564
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	140
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	8,520			$ 8,520
Balance at end of period	8,520
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Writeoff	8,376
Financing Receivable, Allowance for Credit Loss, Recovery	3,579
Net Charge offs	(4,797)
Gross up of allowance for PCD loans at acquistion	1,134
Allowance for Credit Losses on Loans [Abstract]
Balance at beginning of period	35,968
allowance for credit losses on loans	82,151	35,968		$ 82,151
Financing Receivable, Allowance for Credit Loss, Recovery	3,579
Net Charge offs	(4,797)
Gross up of allowance for PCD loans at acquistion	1,134
Provision for credit losses	7,112
Balance at end of period	82,151	$ 35,968
Percent of Loans				0.92%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(8,376)
Net charge offs	4,797
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans					$ 91,943
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | First Staunton Bancshares
Allowance for Credit Losses on Loans [Abstract]
Provision for credit losses	983
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Credit Losses on Loans [Abstract]
allowance for credit losses on loans	55,975			$ 55,975
Balance at end of period	$ 55,975

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Loans Information [Line Items]
Interest receivable	$ 90,263	$ 91,196
Financing Receivable, Nonaccrual, Interest Income	3 million
Recorded Investment(a)	$ 36,154	15,940	$ 11,429
Restructured Loans Subsequently Accruing	30,000
Ytd Restructured Loans Still On Nonaccrual	6,000
Loans and Leases Receivable, Impaired, Commitment to Lend	11,000
Loans and Finance Receivables [Member]
Loans Information [Line Items]
Interest receivable	66,000	$ 63,000
Possible liquidity issues [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	68,000			$ 114,000
Possible liquidity issues [Member] | Oil and Gas Portfolio Segment [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	55,000
Possible liquidity issues [Member] | Commercial Real Estate Lending [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 13,000

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 10,192	$ 9,948	$ 8,159
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)	(43)
Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year		80,730	58,100	$ 0
Accumulated amortization	(21,205)	(12,456)	(5,326)
Total Estimated Amortization Expense	66,904	68,274	52,774
Amortization of other intangible assets	8,749	7,130	5,326
Adjustments to Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Additions during the period	7,379	22,630	58,100
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year		38,970	44,887	$ 34,572
Additions during the period	200	0	10,359
Accumulated amortization	(20,385)	(24,643)	(21,825)
Total Estimated Amortization Expense	1,350	20,027	23,062
Amortization of other intangible assets	$ 1,443	$ 2,818	$ 2,833

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mortgage servicing rights:
Mortgage servicing rights at beginning of year	$ 67,607	$ 68,433	$ 59,168
Additions from acquisition	1,357	0	8,136
Additions	13,667	11,606	10,722
Amortization	(22,664)	(12,432)	(9,594)
Mortgage servicing rights at end of year	59,967	67,607	68,433
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of year	(302)	(239)	(784)
(Additions) recoveries, net	(17,704)	(63)	545
Valuation allowance at end of year	(18,006)	(302)	(239)
Mortgage servicing rights, net	41,961	67,306	68,193
Fair value of mortgage servicing rights	41,990	72,532	81,012
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,743,956	$ 8,488,969	$ 8,600,983
Mortgage servicing rights, net to servicing portfolio	0.54%	0.79%	0.79%
Mortgage servicing rights expense (a)	$ 40,369	$ 12,494	$ 9,049

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Core Deposits [Member]
Estimated future amortization expense
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
Total Estimated Amortization Expense	66,904	$ 68,274	$ 52,774
Other Intangible Assets [Member]
Estimated future amortization expense
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
Total Estimated Amortization Expense	1,350	$ 20,027	$ 23,062
Servicing Contracts [Member]
Estimated future amortization expense
Year ending December 31, 2021	12,895
Year ending December 31, 2022	14,372
Year ending December 31, 2023	10,178
Year ending December 31, 2024	7,502
Year ending December 31, 2025	5,726
Beyond 2025	9,295
Total Estimated Amortization Expense	$ 59,967

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Feb. 14, 2020	Jun. 14, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill, Impairment Loss				$ 0	$ 0	$ 0
Goodwill				1,109,300	1,176,230
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Reductions due to sale				(17,435)	$ (217)	$ (43)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Other Intangible Assets [Member] | ABRC [Member]
Business Acquisition [Line Items]
Reductions due to sale	$ 17,000
Huntington National Bank
Business Acquisition [Line Items]
Goodwill			$ 7,000
First Staunton Bancshares
Business Acquisition [Line Items]
Goodwill	$ 82,000	$ 14,812		$ 15,000

Premises and Equipment, Summary

Premises and Equipment, Summary Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	$ 786,761
Accumulated Depreciation	367,847
Net Book Value	418,914	$ 435,284
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	70,431
Accumulated Depreciation	0
Net Book Value	70,431	69,649
Land improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	18,488
Accumulated Depreciation	8,716
Net Book Value	9,771	9,355
Buildings and improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	390,298
Accumulated Depreciation	168,136
Net Book Value	222,162	230,358
Computers
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	52,846
Accumulated Depreciation	38,128
Net Book Value	14,718	13,242
Furniture, fixtures and other equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	174,362
Accumulated Depreciation	116,304
Net Book Value	58,058	53,342
Operating leases
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	46,632
Accumulated Depreciation	14,638
Net Book Value	31,994	45,381
Leasehold improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Cost	33,706
Accumulated Depreciation	21,925
Net Book Value	$ 11,781	$ 13,958

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 50,567	$ 58,149	$ 48,253
Property, Plant and Equipment, Net	418,914	435,284
Land Improvement, Building, Leasehold Improvements, ATM, Computers, Furniture, Fixtures, and Auto [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	34,000	34,000	$ 34,000
Operating leases
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Net	$ 31,994	$ 45,381

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Cost	$ 11,450	$ 11,006
Finance Lease, Cost	154	36
Operating Lease, Payments	11,276	11,305
Finance Lease, Payments	$ 122	$ 35

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 31,994	$ 45,381
Finance Lease, Right-of-Use Asset	$ 962	$ 2,188
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Present value of lease payments	$ 36,425	$ 49,292
Finance Lease, Liability	$ 1,128	$ 2,209

Leases Operating Lease Informat

Leases Operating Lease Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 40,806	$ 55,580
Operating Lease, Weighted Average Remaining Lease Term	6 years 5 months 12 days	6 years 9 months 29 days
Operating Lease, Weighted Average Discount Rate, Percent	3.27%	3.32%
Finance Lease, Liability, Payment, Due	$ 1,145	$ 4,827
Finance Lease, Weighted Average Remaining Lease Term	1 year 7 months 24 days	39 years 8 months 1 day
Finance Lease, Weighted Average Discount Rate, Percent	1.05%	3.99%
Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 386	$ 46
Operating Lease, Weighted Average Remaining Lease Term	2 years 5 months 26 days	9 months 29 days
Operating Lease, Weighted Average Discount Rate, Percent	0.46%	2.72%
Retail and Corporate Offices [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 34,036	$ 48,940
Operating Lease, Weighted Average Remaining Lease Term	6 years 14 days	6 years 5 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.33%	3.34%
Land
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 6,385	$ 6,594
Operating Lease, Weighted Average Remaining Lease Term	8 years 11 months 26 days	9 years 6 months 25 days
Operating Lease, Weighted Average Discount Rate, Percent	3.09%	3.21%
Finance Lease, Liability, Payment, Due	$ 1,145	$ 4,827
Finance Lease, Weighted Average Remaining Lease Term	1 year 7 months 24 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	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Twelve Months Ending December 31, 2021	$ 9,120
2022	6,791
2023	5,525
2024	4,760
2025	3,818
Beyond 2025	10,792
Total lease payments	40,806	$ 55,580
Less: interest	4,382
Present value of lease payments	36,425	49,292
Finance Leases
Finance Lease, Liability, Payments, Due Next Twelve Months	172
2022	973
2023	0
2024	0
2025	0
Beyond 2025	0
Total lease payments	1,145	4,827
Less: interest	17
Present value of lease payments	1,128	$ 2,209
Total Leases [Line Items]
Twelve Months Ending December 31, 2021	9,293
2022	7,763
2023	5,525
2024	4,760
2025	3,818
Beyond 2025	10,792
Lease, Liability, Payments, Due, Total	41,952
Less: interest	4,399
Present value of lease payments	$ 37,553

Leases, Minimum Annual Rent Und

Leases, Minimum Annual Rent Under Operating Lease Agreements (Details) $ in Thousands	Dec. 31, 2020USD ($)
Payments
2021	$ 9,208
2022	10,189
2023	6,086
2024	5,439
2025	4,268
Thereafter	11,679
Total	46,868
Receipts
2021	3,148
2022	2,595
2023	1,986
2024	1,736
2025	1,625
Thereafter	7,568
Total	$ 18,658

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Liability	$ 17	$ 16
Operating Leases, Rent Expense, Net	$ 5	$ 5	$ 10
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	2 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	42 years
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	6 years

Deposits, Composition (Details)

Deposits, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits, by Type [Abstract]
Noninterest-bearing demand deposits	$ 7,661,728	$ 5,450,709
Savings	3,650,085	2,735,036
Interest-bearing demand	6,090,869	5,329,717
Money market	7,322,769	7,640,798
Brokered CDs	0	5,964
Other time	1,757,030	2,616,839
Total deposits	$ 26,482,481	$ 23,779,064

Deposits, Time Deposit Maturiti

Deposits, Time Deposit Maturities (Details) $ in Thousands	Dec. 31, 2020USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
2021	$ 1,371,671
2022	236,667
2023	77,545
2024	45,185
2025	25,951
Thereafter	11
Total	$ 1,757,030

Deposits (Details)

Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Time Deposits, $100,000 or More	$ 682	$ 1,300
Time Deposits, $250,000 Or More	$ 341	$ 861

Short and Long-term Funding, Co

Short and Long-term Funding, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Federal funds purchased	$ 7,070	$ 362,000
Securities sold under agreements to repurchase	185,901	71,097
Federal funds purchased and securities sold under agreements to repurchase	192,971	433,097
Commercial paper	59,346	32,016
Total short-term funding	252,317	465,113
Debt Instrument [Line Items]
Corporation subordinated notes, at par, due 2025	250,000	250,000
Finance Lease, Liability	1,128	2,209
Other Long-term Debt and Capitalized Costs	(1,663)	(2,866)
Other Long-term Debt	549,465	549,343
TotalShortTermLongTermExcludingFHLB	801,782	1,014,456
Advances from Federal Home Loan Banks [Abstract]
Short-term FHLB advances	0	520,000
Long-term FHLB advances	1,632,723	2,660,967
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,632,723	3,180,967
Debt, Long-term and Short-term, Combined Amount [Abstract]
Debt, Long-term and Short-term, Combined Amount, Total	2,434,505	4,195,422
Bank senior notes, at par, due 2021
Debt Instrument [Line Items]
Senior Notes	$ 300,000	$ 300,000

Short and Long-term Funding Rem

Short and Long-term Funding Remaining Contractual Maturity of Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Remaining Contractual Maturity of the Agreements
Repurchase agreements	$ 185,901	$ 71,097
Overnight and Continuous
Remaining Contractual Maturity of the Agreements
Repurchase agreements	185,901	71,097
Up to 30 days
Remaining Contractual Maturity of the Agreements
Repurchase agreements	0	0
30-90 days
Remaining Contractual Maturity of the Agreements
Repurchase agreements	0	0
Greater than 90 days
Remaining Contractual Maturity of the Agreements
Repurchase agreements	0	0
Agency mortgage-related securities
Remaining Contractual Maturity of the Agreements
Repurchase agreements	185,901	71,097
Agency mortgage-related securities | Overnight and Continuous
Remaining Contractual Maturity of the Agreements
Repurchase agreements	185,901	71,097
Agency mortgage-related securities | Up to 30 days
Remaining Contractual Maturity of the Agreements
Repurchase agreements	0	0
Agency mortgage-related securities | 30-90 days
Remaining Contractual Maturity of the Agreements
Repurchase agreements	0	0
Agency mortgage-related securities | Greater than 90 days
Remaining Contractual Maturity of the Agreements
Repurchase agreements	$ 0	$ 0

Short and Long-term Funding FHL

Short and Long-term Funding FHLB Maturity Schedule (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 1,632,723	$ 3,180,967
Increase Decrease in FHLB Advances		$ (1,500,000)
Weighted Average Coupon Rate		2.34%
Decrease in FHLB Advances, Percent		49.00%
Prepayment of FHLB advances	$ 950,000
Loss on prepayments of FHLB advances		$ 44,650
Increase Decrease in short-term FHLB Advances		$ (520,000)
Long term Funding Weighted Average Coupon Rate		3.83%
Maturity or put date 1 year or less
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 17,723
Weighted Average Coupon Rate		2.25%
After 1 but within 2
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 7,383
Weighted Average Coupon Rate		3.70%
After 2 but within 3
FHLB_Maturity_ [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		$ 2,398
Weighted Average Coupon Rate		5.09%

Short and Long-term Funding Lon

Short and Long-term Funding Long-term Funding, Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Line Items]
Long-term Debt	$ 549,465
Long term Funding Weighted Average Coupon Rate	3.83%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 1,632,723	$ 3,180,967
Weighted Average Coupon Rate	2.34%
Long Term Funding Maturity within One Year [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 299,631
Long term Funding Weighted Average Coupon Rate	3.50%
Long Term Funding Maturity One Year to Two Years [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 967
Long term Funding Weighted Average Coupon Rate	1.07%
Long Term Funding Maturity Two Years to Three Years [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 0
Long term Funding Weighted Average Coupon Rate	0.00%
Long Term Funding Maturity Year Three to Year Four [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 0
Long term Funding Weighted Average Coupon Rate	0.00%
Long Term Funding Maturity Year Four to Year Five [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 248,867
Long term Funding Weighted Average Coupon Rate	4.25%
Long Term Funding Maturity After Year Five [Domain]
Debt Disclosure [Line Items]
Long-term Debt	$ 0
Long term Funding Weighted Average Coupon Rate	0.00%
Maturity or put date 1 year or less
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 17,723
Weighted Average Coupon Rate	2.25%
After 1 but within 2
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 7,383
Weighted Average Coupon Rate	3.70%
After 2 but within 3
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 2,398
Weighted Average Coupon Rate	5.09%
FHLB Maturity Over Three Years to Four Years [Domain]
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 633
Weighted Average Coupon Rate	0.00%
FHLB Maturity Over Four Years to Five Years [Domain]
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 1,000,215
Weighted Average Coupon Rate	2.34%
FHLB Maturity Over Five Years [Domain]
Debt Disclosure [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 604,371
Weighted Average Coupon Rate	2.32%

Short and Long-term Funding Sho

Short and Long-term Funding Short and Long-term Funding (Details) - USD ($) $ in Thousands	Aug. 13, 2018	Nov. 13, 2014	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances			$ 1,632,723	$ 3,180,967
Increase Decrease in FHLB Advances			(1,500,000)
Collateral for repurchase agreements			262,000
Loss on prepayments of FHLB advances			44,650
Risk Management and Shared Serivies [Member]
Debt Instrument [Line Items]
Loss on prepayments of FHLB advances			45,000
Maximum
Debt Instrument [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged			$ 9,900,000
Two Thousand Eighteen Senior Notes [Member] [Domain]
Debt Instrument [Line Items]
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%
Finance Leases [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.00%
Two Thousand Fourteen Subordinated Notes [Member]
Debt Instrument [Line Items]
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%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 01, 2020	Sep. 19, 2018	Sep. 15, 2016	Jun. 15, 2015	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Jul. 25, 2017	Aug. 28, 2015
Stockholders' Equity Note [Abstract]
Subsidiary equity balance					$ 4,000,000
Class of Stock [Line Items]
Preferred Stock, Shares Issued					364,458		264,458
Purchase of stock, value						$ 537
Series C Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued				2,600,000
Preferred Stock, Dividend Rate, Percentage				6.125%
Preferred Stock, Liquidation Preference Per Share				$ 1,000
Preferred Stock, Redemption Price Per Share				$ 1,000
Preferred Stock, Dividend Payment Terms				Shares of the Series C Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series C Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment.
Preferred Stock, Redemption Terms				The Series C Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on June 15, 2020, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends.
Preferred Stock, Voting Rights				Except in certain limited circumstances, the Series C Preferred Stock does not have any voting rights.
Stock repurchase program authorized amount									$ 10,000
Remaining authorized repurchase amount					$ 10,000
Series D Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued			4,000,000
Preferred Stock, Dividend Rate, Percentage			5.375%
Preferred Stock, Liquidation Preference Per Share			$ 1,000
Preferred Stock, Redemption Price Per Share			$ 1,000
Preferred Stock, Participation Rights			Dividends on the Series D Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.375%.
Preferred Stock, Dividend Payment Terms			Shares of the Series D Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series D Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment.
Preferred Stock, Redemption Terms			The Series D Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on September 15, 2021, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends.
Preferred Stock, Voting Rights			Except in certain limited circumstances, the Series D Preferred Stock does not have any voting rights.
Stock repurchase program authorized amount								$ 15,000
Remaining authorized repurchase amount					14,000
Series E Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued		4,000,000
Preferred Stock, Dividend Rate, Percentage		5.875%
Preferred Stock, Liquidation Preference Per Share		$ 1,000
Preferred Stock, Redemption Price Per Share		$ 1,000
Preferred Stock, Participation Rights		Dividends on the Series E Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.875%.
Preferred Stock, Dividend Payment Terms		Shares of the Series E Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series E Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment.
Preferred Stock, Redemption Terms		The Series E Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on December 15, 2023, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends.
Preferred Stock, Voting Rights		Except in certain limited circumstances, the Series E Preferred Stock does not have any voting rights.
Series F Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued	4,000,000
Preferred Stock, Dividend Rate, Percentage	5.625%
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Preferred Stock, Redemption Price Per Share	$ 1,000
Preferred Stock, Participation Rights	Dividends on the Series F Preferred Stock are payable quarterly in arrears only when, as and if declared by the Board of Directors at a rate per annum equal to 5.625%.
Preferred Stock, Dividend Payment Terms	Shares of the Series F Preferred Stock have priority over the Corporation’s common stock with regard to the payment of dividends and distributions upon liquidation, dissolution or winding up. As such, the Corporation may not pay dividends on or repurchase, redeem, or otherwise acquire for consideration shares of its common stock unless dividends for the Series F Preferred Stock have been declared for that period, and sufficient funds have been set aside to make payment.
Preferred Stock, Redemption Terms	The Series F Preferred Stock may be redeemed by the Corporation at its option (i) either in whole or in part, from time to time, on any dividend payment date on or after the dividend payment date occurring on September 15, 2025, or (ii) in whole but not in part, at any time within 90 days following certain regulatory capital treatment events, in each case at a redemption price of $1,000 per share (equivalent to $25 per depositary share), plus any applicable dividends.
Preferred Stock, Voting Rights	Except in certain limited circumstances, the Series F Preferred Stock does not have any voting rights.
Treasury Stock
Class of Stock [Line Items]
Stock repurchase program authorized amount					$ 250,000
Treasury stock shares acquired (in shares)					8,200,000
Treasury stock carrying basis					$ 177,000
Treasury stock acquired average cost per share (in usd per share)					$ 21.62
Common Stock [Member]
Class of Stock [Line Items]
Payments Related to Tax Withholding for Share-based Compensation					$ 9,000
Shares Paid for Tax Withholding for Share Based Compensation					397,969
Minimum tax withholding settlement average cost per share (in usd per share)					$ 21.59
Remaining authorized repurchase amount					$ 113,000

Stock-Based Compensation Assump

Stock-Based Compensation Assumptions used in Estimating the Fair Value for Options Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Dividend yield	3.50%	3.30%	2.50%
Risk-free interest rate	1.60%	2.60%	2.60%
Weighted average expected volatility	21.00%	24.00%	22.00%
Weighted average expected life	5 years 9 months	5 years 9 months	5 years 9 months
Weighted average per share fair value of options	$ 2.39	$ 4	$ 4.47

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 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 (in shares)	1,697
Exercised (in shares)	(182)
Forfeited or expired (in shares)	(585)
Stock Options Shares Outstanding, Ending balance (in shares)	6,473	5,543
Options exercisable (in shares)	4,038
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 20.13
Granted, Weighted Average Exercise Price (in usd per share)	18.43
Exercised, Weighted Average Exercise Price (in usd per share)	13.77
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	21.07
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	19.77	$ 20.13
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 19.25
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 2 months 23 days	6 years 3 months
Options exercisable, Weighted Average Remaining Contractual Term	4 years 10 months 20 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 2,005	$ 16,043
Options exercisable, Aggregate Intrinsic Value	$ 1,913

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 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 (in shares) | shares	1,053
Vested (in shares) | shares	(936)
Forfeited (in shares) | shares	(218)
Outstanding Shares, Ending balance (in shares) | shares	2,293
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 (in usd per share) | $ / shares	18.09
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	22.59
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	20.86
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 20.46

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised	$ 816	$ 4,000	$ 10,000
Total fair value of vested stock options	$ 4,000	3,000	4,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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 [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%
Performance-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years
Term of transfer restrictions	3 years
Service-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	4 years
Term of transfer restrictions	4 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	$ 4,000	4,000	4,000
Recognized compensation expense for accelerated vesting of stock options	2,000
Unvested share-based payment awards	$ 3,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter 2024
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	$ 17,000	$ 21,000	$ 13,000
Recognized compensation expense for accelerated vesting of stock options	7,000
Unvested share-based payment awards	$ 15,000
Employee Service Share Based Compensation Nonvested Awards Compensation Cost Not Yet Recognized Year For Recognition	first quarter 2024
2020 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant (in shares)	14.4
Expiration term of awards	10 years
Vesting Period	4 years

Retirement Plans, Pension and P

Retirement Plans, Pension and Postretirement Plans Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Plan Assets As A Percentage Of Net Benefit Obligation	171.00%	170.00%
RAP
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	$ 442,034	$ 390,564
Actual return on plan assets	58,802	67,377
Employer contributions	0	0
Gross benefits paid	(21,987)	(15,907)
Fair value of plan assets at end of year(a)	478,849	442,034	$ 390,564
Change in Benefit Obligation
Net benefit obligation at beginning of year	260,576	233,658
Service cost	8,244	7,263	7,540
Interest cost	8,185	9,752	9,125
Actuarial (gain) loss	24,998	25,810
Gross benefits paid	(21,987)	(15,907)
Net benefit obligation at end of year(a)	280,017	260,576	233,658
Funded (unfunded) status	198,832	181,458
Noncurrent assets	198,832	181,458
Current liabilities	0	0
Noncurrent liabilities	0	0
Asset (liability) recognized on the consolidated balance sheets	198,832	181,458
Postretirement Plan
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	210	270
Gross benefits paid	(210)	(270)
Fair value of plan assets at end of year(a)	0	0	0
Change in Benefit Obligation
Net benefit obligation at beginning of year	2,545	2,523
Service cost	0	0
Interest cost	78	104	108
Actuarial (gain) loss	(169)	188
Gross benefits paid	(210)	(270)
Net benefit obligation at end of year(a)	2,243	2,545	$ 2,523
Funded (unfunded) status	(2,243)	(2,545)
Noncurrent assets	0	0
Current liabilities	(189)	(214)
Noncurrent liabilities	(2,055)	(2,330)
Asset (liability) recognized on the consolidated balance sheets	$ (2,243)	$ (2,545)

Retirement Plans, Amounts Recog

Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income Table (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
RAP
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ (194)	$ (249)
Net actuarial loss	28,029	37,075
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss	27,835	36,827
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	(477)	(533)
Net actuarial loss	0	126
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss	$ (477)	$ (406)

Retirement Plans, Other Changes

Retirement Plans, Other Changes in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ (148)	$ (148)	$ (148)
Amortization of actuarial loss (gain)	7,780	16,296	(28,612)
Income tax (expense) benefit	(3,064)	(4,465)	6,767
Other comprehensive income (loss) on pension and postretirement obligations	8,465	12,158	$ (25,025)
RAP
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	8,209	17,235
Amortization of prior service cost	(73)	(73)
Amortization of actuarial loss (gain)	3,897	480
Income tax (expense) benefit	(3,040)	(4,532)
Other comprehensive income (loss) on pension and postretirement obligations	8,993	13,109
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	169	(188)
Amortization of prior service cost	(75)	(75)
Amortization of actuarial loss (gain)	0	(4)
Income tax (expense) benefit	(23)	67
Other comprehensive income (loss) on pension and postretirement obligations	$ 71	$ (200)

Retirement Plans, Components of

Retirement Plans, Components of Net Pension Cost for the Retirement Account Plan Tables (Details) - RAP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net period benefit cost for the pension and postretirement plans
Service cost	$ 8,244	$ 7,263	$ 7,540
Interest cost	8,185	9,752	9,125
Expected return on plan assets	(25,595)	(24,332)	(23,195)
Amortization of prior service cost	(73)	(73)	(73)
Amortization of actuarial loss (gain)	3,897	480	2,195
Recognized settlement loss (gain)	0	0	809
Total net periodic pension cost (income)	$ (5,342)	$ (6,910)	$ (3,600)

Retirement Plans Retirement Pla

Retirement Plans Retirement Plans, Components of Net Pension Cost for the Post Retirement Plan Table (Details) - Postretirement Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Interest Cost	$ 78	$ 104	$ 108
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(75)	(75)	(75)
Defined Benefit Plan, Amortization of Gain (Loss)	0	(4)	8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 3	$ 25	$ 41

Retirement Plans, Weighted Aver

Retirement Plans, Weighted Average Assumptions used to Determine Benefit and Net Periodic Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
RAP
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	2.40%	3.20%
Rate of increase in compensation levels	2.00%	2.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.20%	4.30%
Rate of increase in compensation levels	2.00%	3.00%
Expected long-term rate of return on plan assets	6.20%	6.00%
Postretirement Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	2.40%	3.20%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.20%	4.30%

Retirement Plans, Asset Allocat

Retirement Plans, Asset Allocation for Pension Plan Table (Details) - RAP	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	53.00%	51.00%
Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total	33.00%	33.00%
Group annuity contracts
Defined Benefit Plan Disclosure [Line Items]
Total	11.00%	11.00%
Alternative securities
Defined Benefit Plan Disclosure [Line Items]
Total	1.00%	3.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Total	2.00%	2.00%

Retirement Plans, Fair Value of

Retirement Plans, Fair Value of Pension Plan Investments Table (Details) - RAP - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan Investments
RAP Investment Amount	$ 478,849	$ 442,034	$ 390,564
Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	427,983	391,979
Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	50,866	50,055
Money market account
Pension Plan Investments
RAP Investment Amount	9,429	8,903
Money market account | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	9,429	8,903
Money market account | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Money market account | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Common /collective trust funds
Pension Plan Investments
RAP Investment Amount	172,950	155,964
Common /collective trust funds | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	172,950	155,964
Common /collective trust funds | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Common /collective trust funds | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Mutual funds
Pension Plan Investments
RAP Investment Amount	245,605	227,112
Mutual funds | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	245,605	227,112
Mutual funds | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Mutual funds | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts
Pension Plan Investments
RAP Investment Amount	50,866	50,055
Group annuity contracts | Fair Value, Inputs, Level 1
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts | Fair Value, Inputs, Level 2
Pension Plan Investments
RAP Investment Amount	0	0
Group annuity contracts | Fair Value, Inputs, Level 3
Pension Plan Investments
RAP Investment Amount	$ 50,866	$ 50,055

Retirement Plans Retirement P_2

Retirement Plans Retirement Plans, Fair Value Reconciliation of Level 3 Retirement Account Plan Investments (Details) - RAP - Group annuity contracts - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of group annuity contract at beginning of period	$ 50,055	$ 47,265
Return on plan assets	3,499	5,495
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlement	(2,688)	(2,704)
Fair value of group annuity contract at end of period	$ 50,866	$ 50,055

Retirement Plans, Estimated Fut

Retirement Plans, Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2020USD ($)
RAP
Defined Benefit Plan Disclosure [Line Items]
2021	$ 19,332
2022	20,043
2023	19,785
2024	20,304
2025	21,766
2026-2030	91,228
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
2021	191
2022	186
2023	181
2024	175
2025	168
2026-2030	$ 732

Retirement Plans, Effect of 1%

Retirement Plans, Effect of 1% Change in the Assumed Health Care Cost Trend Rate Intro (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in assumed health care cost
100 bp Increase	$ 5	$ 7
100 bp Decrease	(4)	(6)
100 bp Increase	141	170
100 bp Decrease	$ (124)	$ (148)

Retirement Plans (Details)

Retirement Plans (Details) - USD ($)	Feb. 15, 2020	Feb. 14, 2020	Jun. 14, 2019	Feb. 01, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RAP
Retirements Plans [Line Items]
Defined Benefit Plan, Description					The Corporation has a noncontributory defined benefit retirement 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, Expected Amortization of Gain (Loss), Next Fiscal Year					$ 4,000,000
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year					$ 73,000
Actual return on plan assets percentage					15.18%	18.29%
Employer contributions					$ 0	$ 0
Postretirement Plan
Retirements Plans [Line Items]
Defined Benefit Plan, Description					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.
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year					$ 0
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year					75,000
Employer contributions					$ 210,000	270,000
Defined Benefit Plan Health Care Cost Rate Change					(6.00%)
Health care trend rate assumption					5.50%
Defined Benefit Plan, Health Care Cost Trend, Reduction in Trend Rate Minimum					0.25%
Ultimate future rate					5.00%
401(k) plan
Retirements Plans [Line Items]
Total expense related to 401(k)					$ 15,000,000	$ 16,000,000	$ 16,000,000
Minimum [Member] | RAP | Equity securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					50.00%
Minimum [Member] | RAP | Fixed-income securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					30.00%
Minimum [Member] | RAP | Other Cash Equivalents
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					0.00%
Minimum [Member] | RAP | Alternative securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					0.00%
Maximum [Member] | RAP | Equity securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					70.00%
Maximum [Member] | RAP | Fixed-income securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					50.00%
Maximum [Member] | RAP | Other Cash Equivalents
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					10.00%
Maximum [Member] | RAP | Alternative securities
Retirements Plans [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage					15.00%
Bank Mutual [Member]
Retirements Plans [Line Items]
Business Acquisition, Effective Date of Acquisition				Feb. 1, 2018
Business Acquisition, Effective Date of Retirement Eligibility				Feb. 1, 2018
Huntington National Bank
Retirements Plans [Line Items]
Business Acquisition, Effective Date of Acquisition			Jun. 14, 2019
Business Acquisition, Effective Date of Retirement Eligibility			Jun. 14, 2019
First Staunton Bancshares
Retirements Plans [Line Items]
Business Acquisition, Effective Date of Acquisition		Feb. 14, 2020
Business Acquisition, Effective Date of Retirement Eligibility	Feb. 15, 2020

Income Taxes, Current and Defer

Income Taxes, Current and Deferred Amounts of Income Tax Expense Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 33,020	$ 50,560	$ 20,246
State	16,193	15,327	12,593
Total current	49,213	65,887	32,839
Deferred:
Federal	(25,895)	14,094	34,941
State	(3,118)	(261)	12,006
Total deferred	(29,013)	13,833	46,947
Total income tax expense	$ 20,200	$ 79,720	$ 79,786

Income Taxes, Deferred Tax Asse

Income Taxes, Deferred Tax Assets and Liabilities Resulted in Deferred Taxes Table (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gross deferred tax assets:
Allowance for loan losses	$ 88,967	$ 48,790
Allowance for other losses	16,347	7,236
Accrued liabilities	4,673	4,005
Deferred compensation	27,896	28,018
Benefit of tax loss and credit carryforwards	9,789	13,444
Nonaccrual interest	1,763	1,299
Basis Difference From Equity Securities and Other Investments	6,329	0
Net unrealized losses on pension and postretirement benefits	9,110	12,174
Other	997	970
Total deferred tax assets	165,871	115,936
Valuation allowance for deferred tax assets	(251)	(251)	$ (251)
Total deferred tax assets after valuation allowance	165,620	115,685
Gross deferred tax liabilities
Prepaid expenses	63,113	62,227
Goodwill	21,698	21,099
Mortgage banking activities	10,403	17,418
Deferred loan fee income	9,799	12,190
State deferred taxes	2,636	722
Lease financing	116	199
Bank premises and equipment	17,757	18,348
Purchase accounting	12,658	13,738
Deferred Tax Liability, Basis Difference From Equity Securities and Other Investments	0	2,285
Net unrealized gains on AFS securities	13,568	1,139
Other	1,049	1,156
Total deferred tax liabilities	152,797	150,521
Net deferred tax assets (liabilities)		$ (34,836)
Net deferred tax assets (liabilities)	$ 12,823

Income Taxes, Summary of Valuat

Income Taxes, Summary of Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Valuation allowance for deferred tax assets, beginning of year	$ (251)	$ (251)
(Increase) decrease in current year	0	0
Valuation allowance for deferred tax assets, end of year	$ (251)	$ (251)

Income Taxes, Major Reasons for

Income Taxes, Major Reasons for the Difference in Effective Income Tax Rate from the Federal Tax Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation
Federal income tax rate at statutory rate	21.00%	21.00%	21.00%
Increases (decreases) resulting from:
Tax-exempt interest and dividends	(3.90%)	(3.30%)	(2.60%)
State income taxes (net of federal benefit)	3.70%	3.50%	3.70%
Bank owned life insurance	(0.90%)	(0.80%)	(0.70%)
Tax effect of tax credits and benefits, net of related expenses	(1.80%)	(0.90%)	(0.70%)
Tax reserve adjustments / settlements	0.10%	0.20%	1.50%
Net tax (benefit) expense from stock-based compensation	0.30%	(0.20%)	(0.50%)
Tax planning in response to the Tax Act	0.00%	0.00%	(3.60%)
Restructuring in conjunction with ABRC sale	(13.70%)	0.00%	0.00%
FDIC premium	0.80%	0.50%	0.90%
Other	0.60%	(0.40%)	0.30%
Effective income tax rate	6.20%	19.60%	19.30%

Income Taxes, Reconciliation of

Income Taxes, Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 3	$ 2
Additions for tax positions related to current year	0	1
Balance at end of year	$ 3	$ 3

Income Taxes, Textuals (Details

Income Taxes, Textuals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowance for deferred tax assets	$ (251)	$ (251)	$ (251)
Tax Credit Carryforward, Expiration Being Date	begin expiring in 2035
Bad debt from acquired savings banks	$ 100,000
Deferred tax on bad debt from acquired savings banks	25,000
Unrecognized tax benefit impact on effective tax rate	3,000	$ 2,000
Loss on prepayments of FHLB advances	44,650
Risk Management and Shared Serivies [Member]
Operating Loss Carryforwards [Line Items]
Loss on prepayments of FHLB advances	45,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	92,000
Operating tax loss carryforwards from acquisitions	$ 40,000
Operating Loss Carryforwards, Expiration Begin Date	begin expiring in 2031
Tax Credit Carryforward, Amount	$ 2,000
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 3,000

Derivative and Hedging Activi_3

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Asset
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other assets), fair value	$ 219,537	$ 104,305
Less: Legally enforceable master netting agreements	1,936	10,410
Less: Cash collateral pledged/received	10,879	1,408
Net Amounts Presented on the Consolidated Balance Sheets	206,722	92,487
Liability
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivatives (trading and other liabilities), fair value	43,716	37,455
Less: Legally enforceable master netting Liability	1,936	10,410
Less: Cash collateral pledged/received	25,625	11,365
Net Amounts Presented on the Consolidated Balance Sheets	16,155	15,680
Not designated as hedging instruments | Asset | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	3,639,679	3,029,877
Derivatives (trading and other assets), fair value	192,518	77,024
Not designated as hedging instruments | Asset | Foreign currency exchange forwards
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	411,292	272,636
Derivatives (trading and other assets), fair value	4,909	4,226
Not designated as hedging instruments | Asset | Commodity contracts
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	87,547	255,089
Derivatives (trading and other assets), fair value	12,486	20,528
Not designated as hedging instruments | Asset | Mortgage banking(a)
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Asset, Notional Amount	226,818	255,291
Derivatives (trading and other assets), fair value	9,624	2,527
Not designated as hedging instruments | Liability | Interest Rate Related Instruments Customer and Mirror
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	3,639,679	3,029,877
Derivatives (trading and other liabilities), fair value	25,680	13,073
Not designated as hedging instruments | Liability | Foreign currency exchange forwards
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	398,890	264,653
Derivatives (trading and other liabilities), fair value	4,836	4,048
Not designated as hedging instruments | Liability | Commodity contracts
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	83,214	255,165
Derivatives (trading and other liabilities), fair value	11,155	19,624
Not designated as hedging instruments | Liability | Mortgage banking(a)
Derivative Instruments Designated/Not Designated as Hedging Instruments
Derivative Liability, Notional Amount	335,500	263,000
Derivatives (trading and other liabilities), fair value	$ 2,046	$ 710

Derivative and Hedging Activi_4

Derivative and Hedging Activities Cumulative Basis Adjustment for Fair Value Hedges (Details) - Designated as Hedging Instrument [Member] $ in Millions	Dec. 31, 2020USD ($)
Balance Sheet Recording of Fair Value Hedge [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 3
Underlying Hedged Asset, Amortized Cost Basis	604
Derivative Liability Notional Amount, Terminated	$ 500

Derivative and Hedging Activi_5

Derivative and Hedging Activities Income Impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (1,779)	$ (448)
Interest Income [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(1,779)	5,871
Interest Income [Member] | Derivatives designated as hedging instruments(a)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss)	0	(6,319)
Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Other Operating Income (Expense) [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Other Operating Income (Expense) [Member] | Derivatives designated as hedging instruments(a)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss)	$ 0	$ 0

Derivative and Hedging Activi_6

Derivative and Hedging Activities, Income Statement Category of the Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Capital market fees, net | Interest Rate Related Instruments Customer and Mirror
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ (1,758)	$ (1,393)
Capital market fees, net | Foreign currency exchange forwards
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	(105)	132
Capital market fees, net | Commodity contracts
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	427	(1,763)
Mortgage banking, net | Mortgage banking(a)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	7,097	319
Mortgage banking, net | Forward commitments (mortgage)
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ 1,335	$ 1,362

Derivative and Hedging Activi_7

Derivative and Hedging Activities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities pledged as collateral	$ 72	$ 57
Derivative collateral right to reclaim cash	$ 31	$ 14

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Offsetting Derivative Assets [Abstract]
Gross Amounts Recognized	$ 13,441	$ 11,864
Derivative Liabilities Offset	(1,936)	(10,410)
Cash Collateral Received	(10,879)	(1,408)
Net Amounts Presented on the Consolidated Balance Sheets	626	45
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	0
Net Amount	626	45
Offsetting Derivative Liabilities [Abstract]
Gross Amounts Recognized	27,951	22,189
Derivative Assets Offset	(1,936)	(10,410)
Cash Collateral Pledged	(25,625)	(11,365)
Net Amounts Presented on the Consolidated Balance Sheets	390	413
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	0
Net Amount	$ 390	$ 413

Commitments, Off-Balance Shee_3

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 0	$ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
Summary of lending-related and other commitments
Lending related commitments	10,010,492	9,024,412
Commercial letters of credit(a)
Summary of lending-related and other commitments
Lending related commitments	3,642	7,081
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	278,798	277,969
Standby letters of credit, fair value	$ 3,000	$ 3,000

Commitments, Changes in the All

Commitments, Changes in the Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 21,907
Cumulative effect of ASU 2016-13 adoption (CECL)	47,776	$ 21,907
Provision for credit losses	7,000
Balance at end of period	47,776	21,907
Change in the Allowance for Unfunded Commitments
Balance at beginning of period	21,907
Balance at end of period	47,776	21,907
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)			$ 40,597
First Staunton Bancshares
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses	179
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Cumulative effect of ASU 2016-13 adoption (CECL)			$ 18,690
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Change in the Allowance for Unfunded Commitments
Balance at beginning of period	21,907	24,336
Balance at beginning of period, adjusted		24,336
Provision for unfunded commitments	$ 7,000	(2,500)
Balance at end of period		21,907
Amount Recorded at Acquisition [Member] | SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Change in the Allowance for Unfunded Commitments
Amount recorded at acquisition		$ 70

Commitments, Off-Balance Shee_4

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Allowances and Reserve Balance	$ 47,776,000	$ 21,907,000
Expense Related to Qualified Affordable Housing Projects	23,000,000	19,000,000	$ 17,000,000
Remaining Investment in Qualified Affordable Housing Projects	268,000,000	234,000,000
Unfunded Equity Contributions Obligation Amount	118,000,000	123,000,000
Loans repurchased under make whole requests	$ 10,000,000	$ 2,000,000
Loans Sold To Outside Investors Loss Reimbursement Settlement Paid	no	negligible
Loans sold to outside investors original amount	$ 14,400,000,000
Loans sold to outside investors remaining outstanding amount	6,800,000,000
Mortgage Repurchase Reserve	2,000,000	$ 795,000
Residential mortgage loans sold with recourse risk	36,000,000	39,000,000
Residential mortgage loans sold with credit recourse risk	33,000,000	45,000,000
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Allowances and Reserve Balance		21,907,000	$ 24,336,000
Community Reinvestment, Obtaining Tax Credits, and Other Tax Benefits [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	272,000,000	248,000,000
Tax Credit and Other Investments
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	$ 25,000,000	$ 26,000,000

Parent Company Only Financial_3

Parent Company Only Financial Information, Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks		$ 416,154	$ 373,380
Interest-bearing deposits in other financial institutions		298,759	207,624
Other assets	[1]	653,219	506,046
Total assets		33,419,783	32,386,478
Liabilities and Stockholders' Equity
Commercial paper		59,346	32,016
Subordinated notes, at par		250,000	250,000
Long-term funding capitalized costs		1,663	2,866
Total long-term funding		549,465
Other Liabilities		364,088	467,961
Total liabilities		29,328,850	28,464,355
Preferred equity		353,512	256,716
Common equity		1,752	1,752
Total stockholders’ equity		4,090,933	3,922,124	$ 3,780,888	$ 3,237,443
Total liabilities and stockholders’ equity		33,419,783	32,386,478
Parent Company Only
Assets
Cash and due from banks		40,204	17,427
Interest-bearing deposits in other financial institutions		15,228	27,186
Notes and interest receivable from subsidiaries		305,779	201,551
Investments in and receivable due from subsidiaries		4,005,198	3,925,596
Other assets		46,850	46,234
Total assets		4,413,259	4,217,994
Liabilities and Stockholders' Equity
Commercial paper		59,346	32,016
Subordinated notes, at par		250,000	250,000
Long-term funding capitalized costs		(1,133)	(1,428)
Total long-term funding		248,867	248,572
Other Liabilities		14,113	15,282
Total liabilities		322,326	295,870
Preferred equity		353,512	256,716
Common equity		3,737,421	3,665,407
Total stockholders’ equity		4,090,933	3,922,124
Total liabilities and stockholders’ equity		$ 4,413,259	$ 4,217,994
[1]	(a) See Note 1 Summary of Significant Accounting Policies for additional details on the adoption of ASU 2016-13.

Parent Company Only Financial_4

Parent Company Only Financial Information, Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Interest income on notes receivable from subsidiaries	$ 785,241	$ 998,099	$ 976,990
Total income	1,277,012	1,216,498	1,235,148
Expense
Income before income tax expense	326,972	406,509	413,349
Income tax expense	20,200	79,720	79,786
Net income	306,771	326,790	333,562
Preferred stock dividends	18,358	15,202	10,784
Net income available to common equity	288,413	311,587	322,779
Parent Company Only
Income
Income from subsidiaries	317,895	341,789	354,637
Interest income on notes receivable from subsidiaries	3,257	13,983	12,199
Other income	933	761	994
Total income	322,084	356,532	367,830
Expense
Interest expense on short and long-term funding	10,960	16,802	18,355
Other expense	6,422	6,583	11,736
Total expense	17,383	23,384	30,091
Income before income tax expense	304,702	333,148	337,739
Income tax expense	(2,070)	6,359	4,176
Net income	306,771	326,790	333,562
Preferred stock dividends	18,358	15,202	10,784
Net income available to common equity	$ 288,413	$ 311,587	$ 322,779

Parent Company Only Financial_5

Parent Company Only Financial Information, Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income	$ 306,771	$ 326,790	$ 333,562
Adjustments to reconcile net income to net cash provided by operating activities:
Losses (gains) on sales of investment securities, net	(9,222)	(5,957)	1,985
Net change in other assets and other liabilities	32,270	(42,005)	(4,594)
Net cash provided by operating activities	550,020	574,260	496,567
Cash Flows from Investing Activities
Proceeds from sales of investment securities	626,283	1,367,476	601,130
Net cash provided by (used in) investing activities	(793,737)	1,617,446	(380,872)
Cash Flows from Financing Activities
Net increase (decrease) in commercial paper	(238,655)	308,039	(581,371)
Redemption of Corporation's senior notes	0	250,000	0
Proceeds from issuance of common stock for stock-based compensation plans	3,966	11,216	18,408
Proceeds from issuance of preferred stock	96,796	0	97,315
Purchase of preferred shares	0	0	(537)
Common stock warrants exercised			(1)
Purchase of common stock returned to authorized but unissued	0	0	(33,075)
Issuance of treasury stock for acquisition			488,408
Cash dividends on common stock	(112,023)	(111,804)	(105,519)
Cash dividends on preferred stock	(18,358)	(15,202)	(10,784)
Net cash used in financing activities	371,020	(2,479,660)	44,983
Performance/Service Based RSAs, RSA, [Member]
Cash Flows from Financing Activities
Payments for Repurchase of Common Stock	(6,113)	(8,592)	(7,148)
Parent Company Only
Cash Flows from Operating Activities
Net income	306,771	326,790	333,562
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease in equity in undistributed net income (loss) of subsidiaries	(61,406)	(21,789)	(18,636)
Net change in other assets and other liabilities	(49,890)	265	(92,366)
Net cash provided by operating activities	195,475	305,266	222,562
Cash Flows from Investing Activities
Proceeds from sales of investment securities	0	0	827
Net (increase) decrease in notes receivable from subsidiaries	(105,000)	250,000	(139,317)
Net (increase) decrease in loans	0	0	2,210
Net cash provided by (used in) investing activities	(105,000)	250,000	(136,280)
Cash Flows from Financing Activities
Net increase (decrease) in commercial paper	27,330	(13,406)	(22,044)
Redemption of Corporation's senior notes	0	(250,000)	0
Proceeds from issuance of common stock for stock-based compensation plans	3,966	11,216	18,408
Proceeds from issuance of preferred stock	96,796	0	97,315
Purchase of preferred shares	0	0	(537)
Common stock warrants exercised	0	0	(1)
Purchase of common stock returned to authorized but unissued	0	0	(33,075)
Issuance of treasury stock for acquisition	0	0	91,296
Purchase of treasury stock, open market purchases	(71,255)	(177,484)	(206,450)
Cash dividends on common stock	(112,023)	(111,804)	(105,519)
Cash dividends on preferred stock	(18,358)	(15,202)	(10,784)
Net cash used in financing activities	(79,656)	(565,272)	(178,540)
Net increase (decrease) in cash and cash equivalents	10,819	(10,006)	(92,258)
Cash and cash equivalents at beginning of year	44,613	54,619	146,877
Cash and cash equivalents at end of year	$ 55,432	$ 44,613	$ 54,619

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	$ 3,085,441	$ 3,262,586
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,531	0
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,058,910	3,262,586
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	9,624	2,527
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	2,046	710
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,531	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	1,661	1,646
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 | Total investment securities AFS
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,531	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FFELP
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	327,189	263,693
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Other debt securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,000	3,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Total investment securities AFS
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	3,058,910	3,262,586
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Residential loans held for sale
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	129,158	136,280
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Interest rate-related instruments(a)
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	192,518	77,024
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	25,680	13,073
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards(a)
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	4,909	4,226
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	4,836	4,048
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commodity contracts(a)
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	12,486	20,528
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	11,155	19,624
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Interest rate lock commitments to originate residential mortgage loans held for sale
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	9,624	2,527
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 | Forward commitments to sell residential mortgage loans
Liabilities, Fair Value Disclosure [Abstract]
Net Amounts Presented on the Consolidated Balance Sheets	2,046	710
FNMA / FHLMC | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | FNMA / FHLMC
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	1,461,241	132,660
FNMA / FHLMC | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	22,904	21,728
GNMA | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	524,756	1,310,207
U.S. Treasury securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	26,531
Agency securities
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	25,038
Agency securities | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	25,038	0
Obligations of state and political subdivisions (municipal securities)
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	450,662	546,160
Obligations of state and political subdivisions (municipal securities) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	450,662	546,160
SBA
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	8,584
SBA | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Investment securities available for sale	$ 8,584	$ 0

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 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	72,659	24,164
Closed loans / settlements	(76,001)	(29,375)
Other	10,439	5,530
Mortgage derivative gain (loss)	7,097	319
Ending Balance	9,624	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	(3,505)	(2,367)
Closed loans / settlements	(12,587)	(5,968)
Other	17,427	6,973
Mortgage derivative gain (loss)	1,335	(1,362)
Ending Balance	2,046	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	76,164	26,531
Closed loans / settlements	(63,414)	(23,407)
Other	(6,988)	(1,443)
Mortgage derivative gain (loss)	5,762	1,681
Ending Balance	$ 7,579	$ 1,817

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2019	$ 13,000
Carrying value changes	0	$ 13,444	$ 0
Equity Securities without Readily Determinable Fair Value, Amount	13,000	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
Equity Securities without Readily Determinable Fair Value, Amount	$ 13,444	$ 13,444		13,444
Cumulative upward carrying value changes between January 1, 2018 and December 31, 2020				13,444
Cumulative downward carrying value changes between January 1, 2018 and December 31, 2020				$ 0

Fair Value Measurements, Asse_3

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 41,990	$ 72,532	$ 81,012
Mortgage banking, net	17,704	63	$ (545)
Equity Securities without Readily Determinable Fair Value, Amount	13,000	13,000
Equity securities	15,106	15,090
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity Securities without Readily Determinable Fair Value, Amount	13,444	13,444
Equity securities	13,444	13,444
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
OREO(b)	6,125	3,565
Other noninterest expense	3,747	1,860
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Individually evaluated loans(a)	138,752	45,792
Provision for credit losses	(97,519)	(66,172)
Mortgage servicing rights	41,990	72,532
Mortgage banking, net	$ (17,704)	(63)
Equity Securities without Readily Determinable Fair Value, Amount		13,444
Equity securities		$ 13,444

Fair Value Measurements, Schedu

Fair Value Measurements, Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Inputs, Level 3 | Discounted Cash Flow [Member] | Servicing Contracts [Member] | Minimum [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	8.00%
Fair Value, Inputs, Level 3 | Discounted Cash Flow [Member] | Servicing Contracts [Member] | 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%
Fair Value, Inputs, Level 3 | Discounted Cash Flow [Member] | Servicing Contracts [Member] | 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	47.00%
Fair Value, Inputs, Level 3 | Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | Minimum [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	0.00%
Fair Value, Inputs, Level 3 | Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | 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	34.00%
Fair Value, Inputs, Level 3 | Appraisals/Discounted Cash Flow [Member] | Impaired Finance Receivable [Member] | 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	40.00%
Fair Value, Inputs, Level 2
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Long-term Debt, Fair Value	$ 1,760,727	$ 572,873
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Nonrecurring
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
OREO(b)	$ 6,125	$ 3,565

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financial assets
Cash and due from banks	$ 416,154	$ 373,380
Interest-bearing deposits in other financial institutions	298,759	207,624
Federal funds sold and securities purchased under agreements to resell	1,135	7,740
Investment securities held to maturity	1,879,005	2,205,083
Investment securities held to maturity, fair value	2,028,943	2,276,465
Investment securities available for sale	3,085,441	3,262,586
Equity Securities with Readily Determined Fair Value	2,000	2,000
Equity Securities without Readily Determinable Fair Value, Amount	13,000	13,000
Equity securities	15,106	15,090
FHLB and Federal Reserve Bank stocks	168,280	227,347
Commercial loans held for sale	0	15,000
Loans, net	24,068,022	22,620,068
Bank and Corporate Owned Life Insurance	679,647	671,948
Financial liabilities
Short-term funding	252,317	465,113
Other long-term funding	549,465
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,632,723	3,180,967
Commitment on standby letters of credit	279,000	278,000
Interest rate lock commitments to originate residential mortgage loans held for sale
Financial liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	9,624	2,527	$ 2,208
Forward commitments to sell residential mortgage loans
Financial liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	2,046	710	2,072
Total derivatives
Financial liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	7,579	1,817	$ 140
Fair Value, Inputs, Level 1
Financial assets
Cash and due from banks	416,154	373,380
Cash and due from banks, Fair Value	416,154	373,380
Interest-bearing deposits in other financial institutions	298,759	207,624
Interest-bearing deposits in other financial institutions, fair value	298,759	207,624
Federal funds sold and securities purchased under agreements to resell	1,135	7,740
Federal funds sold and securities purchased under agreements to resell, fair value	1,135	7,740
Investment securities held to maturity	999	999
Investment securities held to maturity, fair value	1,024	1,018
Investment securities available for sale	26,531	0
Investment securities available for sale, at fair value	26,531	0
Equity securities with readily determinable fair value, Carrying Amount	1,661	1,646
Equity Securities with Readily Determined Fair Value	1,661	1,646
Fair Value, Inputs, Level 1 | U.S. Treasury securities | Fair Value, Measurements, Recurring [Member]
Financial assets
Investment securities available for sale	26,531	0
Fair Value, Inputs, Level 2
Financial assets
Investment securities held to maturity	1,877,939	2,204,084
Investment securities held to maturity, fair value	2,027,852	2,275,447
Investment securities available for sale	3,058,910	3,262,586
Investment securities available for sale, at fair value	3,058,910	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	129,158	136,280
Mortgage loans held for sale	129,158	136,280
Residential Held-for-sale, Fair Value Disclosure	129,158	136,280
Commercial loans held for sale	0	15,000
Commercial Loans Held-for-sale, Fair Value Disclosure	0	15,000
Bank and Corporate Owned Life Insurance	679,647	671,948
Bank owned life insurance, fair value	679,647	671,948
Financial liabilities
Brokered CDs and other time deposits	1,757,030	2,622,803
Brokered CDs and other time deposits, fair value	1,766,200	2,622,803
Short-term funding	252,317	465,113
Short-term funding, fair value	252,303	465,113
Other long-term funding	549,465	549,343
Other long -term funding, fair value	578,233
Long-term funding, fair value	1,760,727	572,873
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,632,723	3,180,967
Advances, Fair Value Disclosure		3,207,793
Standby letters of credit	2,731	2,710
Standby letters of credit, fair value	2,731	2,710
Fair Value, Inputs, Level 2 | GNMA | Fair Value, Measurements, Recurring [Member]
Financial assets
Investment securities available for sale	235,537	985,139
Fair Value, Inputs, Level 2 | Commercial mortgage-related securities | Fair Value, Measurements, Recurring [Member] | GNMA
Financial assets
Investment securities available for sale	524,756	1,310,207
Fair Value, Inputs, Level 2 | Asset
Financial assets
Derivative Assets	209,913	101,778
Derivatives (trading and other assets), fair value	209,913	101,778
Fair Value, Inputs, Level 2 | Liability
Financial liabilities
Net Amounts Presented on the Consolidated Balance Sheets	41,671	36,745
Derivatives (trading and other liabilities), fair value	41,671	36,745
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	13,444	13,444
Equity securities	13,444	13,444
Loans, net	24,068,022	22,620,068
Loans, net, fair value	24,012,738	22,399,621
Derivative Assets	9,624	2,527
Derivatives (trading and other assets), fair value	9,624	2,527
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	24,725,451	21,156,261
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts, fair value	24,725,451	21,156,261
Net Amounts Presented on the Consolidated Balance Sheets	2,046	710
Derivatives (trading and other liabilities), fair value	$ 2,046	710
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount		13,444
Equity securities		$ 13,444

Fair Value Measurements, Textua

Fair Value Measurements, Textuals (Details)	Dec. 31, 2020shares	Dec. 31, 2020shares
Fair Value Disclosures [Abstract]
Closing Ratio		90.00%
Visa Restricted Shares Owned	77,996
Visa Class A Shares Current Conversion from Class B	126,572	126,572

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Associated Banc-Corp
Regulatory Capital [Abstract]
Total capital	$ 3,632,807	$ 3,208,625
Total Capital Actual Ratio	0.1402	0.1321
Total Capital for Capital Adequacy Purposes Amount	$ 2,072,273	$ 1,943,711
Total Capital for Adequacy Purposes Ratio	0.0800	0.0800
Tier 1 Capital Actual Amount	$ 3,058,809	$ 2,736,776
Tier 1 Capital Actual Ratio	0.1181	0.1126
Tier 1 Capital for Adequacy Purposes Amount	$ 1,554,205	$ 1,457,783
Tier 1 Capital for Adequacy Purposes Ratio	0.0600	0.0600
Common Equity Tier One Capital	$ 2,706,010	$ 2,480,698
Common Equity Tier One Capital to Risk Weighted Assets	10.45%	10.21%
Common Equity Tier One Capital Required for Capital Adequacy	$ 1,165,654	$ 1,093,337
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 Leverage Capital Actual Amount	$ 3,058,809	$ 2,736,776
Tier 1 Leverage Capital Actual Ratio	0.0937	0.0883
Tier 1 Leverage Capital for Adequacy Purposes Amount	$ 1,305,604	$ 1,239,431
Tier 1 Leverage Capital for Adequacy Purposes Ratio	0.0400	0.0400
Associated Bank, N.A.
Regulatory Capital [Abstract]
Total capital	$ 3,295,823	$ 2,892,650
Total Capital Actual Ratio	0.1274	0.1195
Total Capital for Capital Adequacy Purposes Amount	$ 2,068,801	$ 1,936,732
Total Capital for Adequacy Purposes Ratio	0.0800	0.0800
Total Capital to be Well Capitalized Amount	$ 2,586,002	$ 2,420,915
Total Capital to be Well Capitalized Ratio	0.1000	0.1000
Tier 1 Capital Actual Amount	$ 2,971,234	$ 2,669,372
Tier 1 Capital Actual Ratio	0.1149	0.1103
Tier 1 Capital for Adequacy Purposes Amount	$ 1,551,601	$ 1,452,549
Tier 1 Capital for Adequacy Purposes Ratio	0.0600	0.0600
Tier 1 Capital To Be Well Capitalized Amount	$ 2,068,801	$ 1,936,732
Tier 1 Capital To Be Well Capitalized Ratio	0.0800	0.0800
Common Equity Tier One Capital	$ 2,971,234	$ 2,469,578
Common Equity Tier One Capital to Risk Weighted Assets	11.49%	10.20%
Common Equity Tier One Capital Required for Capital Adequacy	$ 1,163,701	$ 1,089,412
Common Equity Tier One Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 Equity Capital to be Well Capitalized Amount	$ 1,680,901	$ 1,573,595
Tier 1 Equity Capital to be Well Capitalized Ratio	6.50%	6.50%
Tier 1 Leverage Capital Actual Amount	$ 2,971,234	$ 2,669,372
Tier 1 Leverage Capital Actual Ratio	0.0911	0.0863
Tier 1 Leverage Capital for Adequacy Purposes Amount	$ 1,304,448	$ 1,236,565
Tier 1 Leverage Capital for Adequacy Purposes Ratio	0.0400	0.0400
Tier 1 Leverage Capital To Be Well Capitalized Amount	$ 1,630,560	$ 1,545,706
Tier 1 Leverage Capital To Be Well Capitalized Ratio	0.0500	0.0500

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Calculations for basic and diluted earnings per common share
Net income	$ 306,771	$ 326,790	$ 333,562
Preferred stock dividends	(18,358)	(15,202)	(10,784)
Net income available to common equity	288,413	311,587	322,779
Common shareholder dividends	(111,291)	(111,091)	(104,981)
Unvested share-based payment awards	(732)	(713)	(537)
Undistributed earnings	176,390	199,784	217,260
Undistributed earnings allocated to common shareholders	175,134	198,424	216,199
Undistributed earnings allocated to unvested share-based payment awards	1,256	1,360	1,060
Undistributed earnings	176,390	199,784	217,260
Basic
Distributed earnings to common shareholders	111,291	111,091	104,981
Undistributed earnings allocated to common shareholders	175,134	198,424	216,199
Total common shareholders earnings, basic	286,425	309,514	321,181
Diluted
Distributed earnings to common shareholders	111,291	111,091	104,981
Undistributed earnings allocated to common shareholders	175,134	198,424	216,199
Total common shareholders earnings, diluted	$ 286,425	$ 309,514	$ 321,181
Weighted average common shares outstanding	153,005	160,534	167,345
Effect of dilutive common stock awards	637	1,398	1,985
Effect of dilutive common stock warrants	0	0	402
Diluted weighted average common shares outstanding	153,642	161,932	169,732
Basic earnings per common share	$ 1.87	$ 1.93	$ 1.92
Diluted earnings per common share	$ 1.86	$ 1.91	$ 1.89

Earnings Per Common Share Narra

Earnings Per Common Share Narrative (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	7	3	2

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Income Statement Data Abstract
Net interest income	$ 762,957	$ 835,674	$ 879,580
Net intersegment interest income (expense)	0	0	0
Segment net interest income	762,957	835,674	879,580
Noninterest income	514,056	380,824	355,568
Total revenue	1,277,012	1,216,498	1,235,148
Provision for credit losses	174,006	16,000	0
Noninterest expense	776,034	793,988	821,799
Income (loss) before income taxes	326,972	406,509	413,349
Income tax expense (benefit)	20,200	79,720	79,786
Net income	306,771	326,790	333,562
Segment Balance Sheet Data
Allocated goodwill	1,109,300	1,176,230	1,169,023
Operating Segments | Corporate and Commercial Specialty [Member]
Segment Income Statement Data Abstract
Net interest income	395,135	447,979	458,240
Net intersegment interest income (expense)	10,400	(52,200)	(33,519)
Segment net interest income	405,535	395,779	424,721
Noninterest income	149,456	136,097	132,071
Total revenue	554,991	531,876	556,793
Provision for credit losses	59,780	49,341	42,234
Noninterest expense	209,507	233,655	233,202
Income (loss) before income taxes	285,705	248,879	281,356
Income tax expense (benefit)	53,193	47,480	54,732
Net income	232,512	201,399	226,625
Segment Balance Sheet Data
Allocated goodwill	530,144	530,144	528,832
Operating Segments | Community, Consumer and Business [Member]
Segment Income Statement Data Abstract
Net interest income	295,297	301,563	322,020
Net intersegment interest income (expense)	54,203	93,331	76,876
Segment net interest income	349,500	394,894	398,896
Noninterest income	185,737	223,712	212,711
Total revenue	535,237	618,606	611,607
Provision for credit losses	21,862	18,594	18,500
Noninterest expense	429,447	467,086	463,187
Income (loss) before income taxes	83,928	132,925	129,920
Income tax expense (benefit)	17,625	27,914	27,283
Net income	66,303	105,011	102,637
Segment Balance Sheet Data
Allocated goodwill	579,156	646,086	640,191
Operating Segments | Risk Management and Shared Services [Member]
Segment Income Statement Data Abstract
Net interest income	72,525	86,132	99,320
Net intersegment interest income (expense)	(64,603)	(41,130)	(43,357)
Segment net interest income	7,922	45,001	55,963
Noninterest income	178,862	21,015	10,785
Total revenue	186,784	66,017	66,748
Provision for credit losses	92,365	(51,935)	(60,734)
Noninterest expense	137,080	93,247	125,410
Income (loss) before income taxes	(42,661)	24,705	2,073
Income tax expense (benefit)	(50,618)	4,325	(2,228)
Net income	7,957	20,379	4,301
Segment Balance Sheet Data
Allocated goodwill	0	0	0
Business Combination, Acquisition Related Costs	$ 2,000	$ 7,000	$ 29,000

Segment Reporting (Details Text

Segment Reporting (Details Textuals) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)segment
Segment Reporting, Measurement Disclosures [Abstract]
Number of Reportable Segments | segment	3
Tax Benefit from Tax Planning Strategies | $	$ 63

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (33,183)
Personnel	(432,151)	$ (487,063)	$ (482,676)
Reclassification from OCI due to change in accounting principle	0	0	(84)
Interest income	3,359	895	(572)
Net other comprehensive income (loss) during period	45,801	91,789	(62,214)
Ending Balance	12,618	(33,183)
Investment Securities AFS
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	3,989	(75,643)	(38,453)
Other comprehensive income (loss) before reclassifications	55,628	111,592	(39,891)
Investment securities losses (gains), net	(9,222)	(5,957)	1,985
Personnel	0	0	0
Other Expenses	0	0
Reclassification from OCI due to change in accounting principle			(84)
Adjustment for adoption of ASU 2018-02			(8,419)
Interest income	3,359	895	(572)
Other Comprehensive Income (Loss), Tax	(12,429)	(26,898)	9,791
Net other comprehensive income (loss) during period	37,336	79,631	(37,189)
Ending Balance	41,325	3,989	(75,643)
Defined Benefit Pension and Postretirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(37,172)	(49,330)	(24,305)
Other comprehensive income (loss) before reclassifications	7,780	16,296	(28,612)
Investment securities losses (gains), net	0	0	0
Personnel	(148)	(148)	(148)
Other Expenses	3,897	476	2,203
Reclassification from OCI due to change in accounting principle			0
Adjustment for adoption of ASU 2018-02			(5,235)
Interest income	0	0	0
Other Comprehensive Income (Loss), Tax	(3,064)	(4,465)	6,767
Net other comprehensive income (loss) during period	8,465	12,158	(25,025)
Ending Balance	(28,707)	(37,172)	(49,330)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(33,183)	(124,972)	(62,758)
Other comprehensive income (loss) before reclassifications	63,408	127,887	(68,503)
Investment securities losses (gains), net	(9,222)	(5,957)	1,985
Personnel	(148)	(148)	(148)
Other Expenses	3,897	476	2,203
Reclassification from OCI due to change in accounting principle			(84)
Adjustment for adoption of ASU 2018-02			(13,654)
Interest income	3,359	895	(572)
Other Comprehensive Income (Loss), Tax	(15,493)	(31,363)	16,558
Net other comprehensive income (loss) during period	45,801	91,789	(62,214)
Ending Balance	$ 12,618	$ (33,183)	$ (124,972)

Revenues Revenue Recognition by

Revenues Revenue Recognition by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		$ 246,077	$ 288,247	$ 290,084
Noninterest Income, Outside of Scope of Topic 606		267,979	92,577	65,484
Total noninterest income		514,056	380,824	355,568
Wealth management fees(a)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606	[1]	84,957	83,467	82,562
Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		56,307	63,135	66,075
Card-based fees(b)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		38,605	39,912	39,810
Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		45,245	89,104	89,511
Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		20,963	12,629	12,126
Corporate and Commercial Specialty [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		105,678	97,899	98,251
Noninterest Income, Outside of Scope of Topic 606		43,778	38,198	33,820
Corporate and Commercial Specialty [Member] | Wealth management fees(a)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		83,570	80,719	79,685
Corporate and Commercial Specialty [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		16,903	13,342	15,424
Corporate and Commercial Specialty [Member] | Card-based fees(b)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		1,534	1,827	1,796
Corporate and Commercial Specialty [Member] | Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		208	364	349
Corporate and Commercial Specialty [Member] | Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		3,462	1,647	997
Community, Consumer and Business [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		141,775	188,666	190,225
Noninterest Income, Outside of Scope of Topic 606		43,962	35,046	22,486
Community, Consumer and Business [Member] | Wealth management fees(a)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		1,387	2,838	2,655
Community, Consumer and Business [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		39,371	49,744	50,582
Community, Consumer and Business [Member] | Card-based fees(b)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		36,937	37,895	37,977
Community, Consumer and Business [Member] | Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		45,027	88,727	89,123
Community, Consumer and Business [Member] | Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		19,053	9,462	9,887
Risk Management and Shared Services [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		(1,375)	1,532	1,609
Noninterest Income, Outside of Scope of Topic 606		180,237	19,483	9,176
Risk Management and Shared Services [Member] | Wealth management fees(a)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		0	(90)	222
Risk Management and Shared Services [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		33	49	69
Risk Management and Shared Services [Member] | Card-based fees(b)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		134	190	37
Risk Management and Shared Services [Member] | Insurance commissions and fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		10	13	39
Risk Management and Shared Services [Member] | Other revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		(1,552)	1,370	1,242
Risk Management and Shared Serivies [Member] | ABRC [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Gain (Loss) on Disposition of Assets for Financial Service Operations		163,000
Operating Segments [Member] | Corporate and Commercial Specialty [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		149,456	136,097	132,071
Operating Segments [Member] | Community, Consumer and Business [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		185,737	223,712	212,711
Operating Segments [Member] | Risk Management and Shared Services [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		$ 178,862	$ 21,015	$ 10,785
[1]	(a) Includes trust, asset management, brokerage, and annuity fees.

Recent Developments (Details)

Recent Developments (Details) - $ / shares	Feb. 02, 2021	Jun. 01, 2020	Sep. 19, 2018	Sep. 15, 2016	Jun. 15, 2015
Series C Preferred Stock
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage					6.125%
Series D Preferred Stock
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage				5.375%
Series E Preferred Stock
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage			5.875%
Series F Preferred Stock [Member]
Recent Developments [Line Items]
Preferred Stock, Dividend Rate, Percentage		5.625%
Subsequent Event [Member]
Recent Developments [Line Items]
Dividends Payable, Date Declared	Feb. 2, 2021
Subsequent Event [Member] | Common Stock [Member]
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 15, 2021
Dividends Payable, Date of Record	Mar. 1, 2021
Subsequent Event [Member] | Common Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Common stock, dividends declared ($ per share)	$ 0.18
Subsequent Event [Member] | Series C Preferred Stock
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 15, 2021
Dividends Payable, Date of Record	Mar. 1, 2021
Subsequent Event [Member] | Series C Preferred Stock | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred stock, dividends declared ($ per share)	$ 0.3828125
Subsequent Event [Member] | Series D Preferred Stock
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 15, 2021
Dividends Payable, Date of Record	Mar. 1, 2021
Subsequent Event [Member] | Series D Preferred Stock | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred stock, dividends declared ($ per share)	$ 0.3359375
Subsequent Event [Member] | Series E Preferred Stock
Recent Developments [Line Items]
Dividends Payable, Date to be Paid	Mar. 15, 2021
Dividends Payable, Date of Record	Mar. 1, 2021
Subsequent Event [Member] | Series E Preferred Stock | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred stock, dividends declared ($ per share)	$ 0.3671875
Subsequent Event [Member] | Series F Preferred Stock [Member] | Dividend Declared [Member]
Recent Developments [Line Items]
Preferred stock, dividends declared ($ per share)	$ 0.3515625
Preferred Stock, Dividend Rate, Percentage	5.625%

Uncategorized Items - asb-20201

Label	Element	Value
Restricted Cash	us-gaap_RestrictedCash	$ 188,512,000
Restricted Cash	us-gaap_RestrictedCash	0
Restricted Cash	us-gaap_RestrictedCash	93,914,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets	2,567,488,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets	695,848,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets	456,480,000
Equity issued in (adjustments related to) acquisition	asb_EquityIssuedInAdjustmentsRelatedToAcquisition	0
Equity issued in (adjustments related to) acquisition	asb_EquityIssuedInAdjustmentsRelatedToAcquisition	488,408,000
Equity issued in (adjustments related to) acquisition	asb_EquityIssuedInAdjustmentsRelatedToAcquisition	79,000
Cash Equivalents, at Carrying Value	us-gaap_CashEquivalentsAtCarryingValue	716,048,000
Cash Equivalents, at Carrying Value	us-gaap_CashEquivalentsAtCarryingValue	782,784,000
Cash Equivalents, at Carrying Value	us-gaap_CashEquivalentsAtCarryingValue	400,232,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill	asb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsIncludingGoodwill	29,837,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill	asb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsIncludingGoodwill	23,548,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Including Goodwill	asb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsIncludingGoodwill	$ 261,243,000