Associated Banc-Corp (ASB) 10-Q 27 Apr 21 2020 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 23, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-31343
Entity Registrant Name	Associated Banc-Corp
Entity Incorporation, State or Country Code	WI
Entity Address, Address Line One	433 Main Street
Entity Address, City or Town	Green Bay,
Entity Address, State or Province	WI
Entity Tax Identification Number	39-1098068
Entity Address, Postal Zip Code	54301
City Area Code	920
Local Phone Number	491-7500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		152,808,020
Entity Central Index Key	0000007789
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	ASB
Security Exchange Name	NYSE
Series C Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 6.125% Non-Cum. Perp Pref Stock, Srs C
Trading Symbol	ASB PrC
Security Exchange Name	NYSE
Series D Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.375% Non-Cum. Perp Pref Stock, Srs D
Trading Symbol	ASB PrD
Security Exchange Name	NYSE
Series E Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.875% Non-Cum. Perp Pref Stock, Srs E
Trading Symbol	ASB PrE
Security Exchange Name	NYSE
Series F Preferred Stock | The New York Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shrs, each representing 1/40th intrst in a shr of 5.625% Non-Cum. Perp Pref Stock, Srs F
Trading Symbol	ASB PrF
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 356,285	$ 416,154
Interest-bearing deposits in other financial institutions	1,590,494	298,759
Federal funds sold and securities purchased under agreements to resell	0	1,135
Investment securities AFS, at fair value	3,356,949	3,085,441
Investment securities HTM, net, at amortized cost	1,857,087	1,878,938
Equity securities	15,673	15,106
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	168,281	168,280
Residential loans held for sale	153,151	129,158
Loans	24,162,328	24,451,724
Allowance for loan losses	(352,938)	(383,702)
Loans, net	23,809,389	24,068,022
Tax credit and other investments	303,701	297,232
Premises and equipment, net	398,671	418,914
Bank and corporate owned life insurance	680,831	679,647
Goodwill	1,104,992	1,109,300
Other intangible assets, net	64,701	68,254
Mortgage servicing rights, net	49,500	41,961
Interest receivable	86,466	90,263
Other assets	579,084	653,219
Total assets	34,575,255	33,419,783
Liabilities and Stockholders' Equity
Noninterest-bearing demand deposits	8,496,194	7,661,728
Interest-bearing deposits	19,180,972	18,820,753
Total deposits	27,677,166	26,482,481
Federal funds purchased and securities sold under agreements to repurchase	138,507	192,971
Commercial paper	51,171	59,346
FHLB advances	1,629,966	1,632,723
Total long-term funding	2,179,694	2,182,188
Allowance for unfunded commitments	50,776	47,776
Accrued expenses and other liabilities	350,160	364,088
Total liabilities	30,447,474	29,328,850
Stockholders’ Equity
Preferred equity	353,512	353,512
Common stock	1,752	1,752
Surplus	1,706,786	1,720,329
Retained earnings	2,520,144	2,458,920
Accumulated other comprehensive income (loss)	(4,193)	12,618
Treasury stock, at cost	(450,222)	(456,198)
Total common equity	3,774,268	3,737,421
Total stockholders’ equity	4,127,780	4,090,933
Total liabilities and stockholders’ equity	$ 34,575,255	$ 33,419,783
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	364,458	364,458
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Common shares issued	175,216,409	175,216,409
Common shares outstanding	153,684,904	153,540,224
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Preferred shares, par value	$ 1	$ 1
Common shares, par value	$ 0.01	$ 0.01
Off-Balance Sheet, Credit Loss, Liability	$ 50,776	$ 47,776	$ 21,907

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income
Interest and fees on loans	$ 174,049	$ 224,786
Interest and dividends on investment securities
Taxable	7,014	20,272
Tax-exempt	14,162	14,882
Other interest	1,694	3,304
Total interest income	196,920	263,244
Interest expense
Interest on deposits	5,909	36,666
Interest on federal funds purchased and securities sold under agreements to repurchase	26	368
Interest on other short-term funding	6	36
Interest on FHLB advances	9,493	17,626
Interest on long-term funding	5,585	5,607
Total interest expense	21,018	60,303
Net interest income	175,902	202,942
Provision for credit losses	(23,004)	53,001
Net interest income after provision for credit losses	198,906	149,941
Noninterest income
Noninterest Income In Scope of Topic 606	51,762	71,348
Capital markets, net	8,118	7,935
Mortgage banking, net	23,925	6,143
Bank and corporate owned life insurance	2,702	3,094
Asset gains (losses), net	4,809	(77)
Investment securities gains (losses), net	(39)	6,118
Gains on sale of branches, net(a)	1,002	0
Other	3,141	2,352
Total noninterest income	95,343	98,306
Noninterest expense
Personnel	104,026	114,200
Technology	20,740	20,799
Occupancy	16,156	16,069
Business development and advertising	4,395	5,826
Equipment	5,518	5,439
Legal and professional	6,530	5,160
Loan and foreclosure costs	2,220	3,120
FDIC assessment	4,750	5,500
Other intangible amortization	2,236	2,814
Other	8,775	13,263
Total noninterest expense	175,347	192,191
Income (loss) before income taxes	118,903	56,056
Income tax expense (benefit)	24,602	10,219
Net income	94,301	45,838
Preferred stock dividends	5,207	3,801
Net income available to common equity	$ 89,094	$ 42,037
Earnings per common share
Basic	$ 0.58	$ 0.27
Diluted	$ 0.58	$ 0.27
Average common shares outstanding
Basic	152,355	154,701
Diluted	153,688	155,619
Wealth management fees
Noninterest income
Noninterest Income In Scope of Topic 606	$ 22,414	$ 20,816
Service charges and deposit account fees
Noninterest income
Noninterest Income In Scope of Topic 606	14,855	15,222
Card-based fees
Noninterest income
Noninterest Income In Scope of Topic 606	9,764	9,607
Card-based fees	9,743	9,597
Other fee-based revenue
Noninterest income
Noninterest Income In Scope of Topic 606	4,653	3,096
Card-based fees	4,596	4,497
Insurance commissions and fess
Noninterest income
Noninterest Income In Scope of Topic 606	76	22,608
Operating Segments | Risk Management and Shared Services
Interest expense
Net interest income	14,465	20,261
Provision for credit losses	(45,612)	35,720
Noninterest income
Total noninterest income	6,184	6,223
Noninterest expense
Total noninterest expense	20,275	24,110
Income (loss) before income taxes	26,427	(41,285)
Income tax expense (benefit)	6,737	(8,613)
Net income	$ 19,690	$ (32,672)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 94,301	$ 45,838
Investment securities AFS
Net unrealized gains (losses)	(23,979)	26,419
Amortization of net unrealized (gains) losses on AFS securities transferred to HTM securities	518	556
Reclassification adjustment for net losses (gains) realized in net income	39	(6,118)
Income tax (expense) benefit	5,851	(5,225)
Other comprehensive income (loss) on investment securities AFS	(17,571)	15,632
Defined benefit pension and postretirement obligations
Amortization of prior service cost	(37)	(38)
Amortization of actuarial loss (gain)	1,050	808
Income tax (expense) benefit	(253)	(193)
Other comprehensive income (loss) on pension and postretirement obligations	760	577
Total other comprehensive income (loss)	(16,811)	16,209
Comprehensive income	$ 77,490	$ 62,046

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period Of Adoption, Adjustment	Performance/Service Based RSAs, RSA,	Board Authorized Purchase Program [Member]	Series C Preferred Stock	Series D Preferred Stock	Series E Preferred Stock	Preferred Equity	Preferred EquityCumulative Effect, Period Of Adoption, Adjustment	Common Stock	Common StockCumulative Effect, Period Of Adoption, Adjustment	Surplus	SurplusCumulative Effect, Period Of Adoption, Adjustment	Retained Earnings	Retained EarningsCumulative Effect, Period Of Adoption, Adjustment	Retained EarningsSeries F Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	Treasury StockCumulative Effect, Period Of Adoption, Adjustment	Treasury StockPerformance/Service Based RSAs, RSA,	Treasury StockBoard Authorized Purchase Program [Member]
Beginning balance at Dec. 31, 2019	$ 3,922,124	$ 3,823,787						$ 256,716	$ 256,716	$ 1,752	$ 1,752	$ 1,716,431	$ 1,716,431	$ 2,380,867	$ 2,282,530		$ (33,183)	$ (33,183)	$ (400,460)	$ (400,460)
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019		$ (98,337)
Comprehensive income
Net income	45,838													45,838
Other comprehensive income (loss)	16,209																16,209
Comprehensive income	62,046
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	2,896											(20,659)		0					23,555
Purchase of treasury stock,			$ (5,555)	$ (71,255)																	$ (5,555)	$ (71,255)
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(28,392)													(28,392)
Preferred stock(a)	(3,801)													(3,801)
Stock-based compensation expense, net	10,744											10,744
Ending balance at Mar. 31, 2020	3,790,471							256,716		1,752		1,706,516		2,296,176			(16,974)		(453,714)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					$ 0.3828125	$ 0.3359375	$ 0.3671875
Beginning balance at Dec. 31, 2020	4,090,933							353,512		1,752		1,720,329		2,458,920			12,618		(456,198)
Comprehensive income
Net income	94,301													94,301
Other comprehensive income (loss)	(16,811)																(16,811)
Comprehensive income	77,490
Common stock issued
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	10,556											(16,986)							27,542
Purchase of treasury stock,			$ (3,593)	$ (17,973)																	$ (3,593)	$ (17,973)
Cash dividends
Common stock ($0.17 per share in 2019 and $0.18 per share in 2020)	(27,870)													(27,870)
Preferred stock(a)	(5,207)													(5,207)
Stock-based compensation expense, net	3,444											3,444
Ending balance at Mar. 31, 2021	$ 4,127,780							$ 353,512		$ 1,752		$ 1,706,786		$ 2,520,144			$ (4,193)		$ (450,222)
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid					$ 0.3828125	$ 0.3359375	$ 0.3671875									$ 0.3515625

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Cash Flow From Operating Activities
Net income	$ 94,301	$ 45,838
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Provision for credit losses	(23,004)	53,001
Depreciation and amortization	12,038	14,971
Addition to (recovery of) valuation allowance on mortgage servicing rights, net	(10,578)	9,098
Amortization of mortgage servicing rights	6,388	3,635
Amortization of other intangible assets	2,236	2,814
Amortization and accretion on earning assets, funding, and other, net	7,941	5,728
Net amortization of tax credit investments	8,301	6,486
Losses (gains) on sales of investment securities, net	39	(6,118)
Asset (gains) losses, net	(4,809)	77
Gain (Loss) on Disposition of Business	(1,002)	0
(Gain) loss on mortgage banking activities, net	(10,326)	(14,274)
Mortgage loans originated and acquired for sale	(412,645)	(310,254)
Proceeds from sales of mortgage loans held for sale	400,135	297,265
Changes in certain assets and liabilities
(Increase) decrease in interest receivable	3,797	(1,181)
Increase (decrease) in interest payable	(8,694)	(6,511)
Increase (decrease) in expense payable	(12,818)	(61,924)
(Increase) decrease in net derivative position	69,829	(77,369)
Increase (decrease) in unsettled trades	3,000	0
(Increase) decrease in net income tax position	10,627	(23,556)
Net change in other assets and other liabilities	23,012	42,192
Net cash provided by (used in) operating activities	157,768	(20,083)
Cash Flow From Investing Activities
Net decrease (increase) in loans	274,733	(1,395,767)
Purchases of
AFS securities	(809,140)	(93,487)
HTM securities	(37,215)	(29,463)
Federal Home Loan Bank and Federal Reserve Bank stocks	(1)	(49,794)
Premises, equipment, and software, net of disposals	(6,477)	(11,045)
Other intangibles	0	(200)
Proceeds from
Sales of AFS securities	51,295	365,239
Sale of Federal Home Loan Bank and Federal Reserve Bank stocks	0	55,000
Prepayments, calls, and maturities of AFS investment securities	419,235	186,496
Prepayments, calls, and maturities of HTM investment securities	97,196	84,360
Sales, prepayments, calls, and maturities of other assets	8,525	10,482
Net change in tax credit and alternative investments	(12,990)	(17,877)
Net cash (paid) received in acquisition	0	31,452
Net cash provided by (used in) investing activities	(12,354)	(927,507)
Cash Flow From Financing Activities
Net increase (decrease) in deposits	1,225,867	1,443,965
Net Decrease In Deposits Due To Branch Sales	(31,083)	0
Net increase (decrease) in short-term funding	(62,639)	(324,317)
Net increase (decrease) in short-term FHLB advances	0	30,000
Repayment of long-term FHLB advances	(2,954)	(5,464)
Proceeds from long-term FHLB advances	251	0
(Repayment) proceeds of finance lease principal	37	1
Proceeds from issuance of common stock for stock-based compensation plans	10,556	2,896
Cash dividends on common stock	(27,870)	(28,392)
Cash dividends on preferred stock	(5,207)	(3,801)
Net cash provided by (used in) financing activities	1,085,319	1,038,079
Net increase (decrease) in cash and cash equivalents	1,230,732	90,488
Cash and cash equivalents at beginning of period	716,048	588,744	$ 588,744
Cash and cash equivalents at end of period(a)	1,946,780	679,232	716,048
Supplemental disclosures of cash flow information
Cash paid for interest	29,258	66,316
Cash paid for (received from) income and franchise taxes	(114)	1,373
Loans and bank premises transferred to OREO	15,426	3,374
Capitalized mortgage servicing rights	3,348	3,716
Loans transferred into held for sale from portfolio, net	5,582	205,065
Unsettled trades to purchase securities	3,000	0
Acquisition
Fair value of assets acquired, including cash and cash equivalents				$ 0	$ 457,448
Fair value ascribed to goodwill and intangible assets				0	22,538
Fair value of liabilities assumed				0	479,985
Restricted Cash and Cash Equivalents
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total	1,946,780	679,232	$ 588,744	$ 1,946,780	$ 679,232
Retained Earnings
Cash Flow From Operating Activities
Net income	94,301	45,838
Whitnell
Proceeds from
Sales, prepayments, calls, and maturities of other assets	2,484	0
Performance/Service Based RSAs, RSA,
Cash Flow From Financing Activities
Payments for Repurchase of Common Stock	(3,593)	(5,555)
Board Authorized Purchase Program [Member]
Cash Flow From Financing Activities
Payments for Repurchase of Common Stock	$ (17,973)	$ (71,255)

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the financial position, results of operations and comprehensive income, changes in stockholders’ equity, and cash flows of the Corporation and Parent Company for the periods presented, and all such adjustments are of a normal recurring nature. The consolidated financial statements include the accounts of all subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the ACLL, goodwill impairment assessment, MSRs valuation, and income taxes. Management has evaluated subsequent events for potential recognition or disclosure. Within the tables presented, certain columns and rows may not sum due to the use of rounded numbers for disclosure purposes.

Acquisitions

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

Summary of Significant Accounti

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

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Earnings per common share are calculated utilizing the two-class method. Basic earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding. Diluted earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding adjusted for the dilutive effect of common stock awards (outstanding stock options and unvested restricted stock awards). Presented below are the calculations for basic and diluted earnings per common share: Three Months Ended March 31, (In Thousands, except per share data) 2021 2020 Net income $ 94,301 $ 45,838 Preferred stock dividends (5,207) (3,801) Net income available to common equity $ 89,094 $ 42,037 Common shareholder dividends (27,661) (28,264) Unvested share-based payment awards (209) (128) Undistributed earnings $ 61,224 $ 13,645 Undistributed earnings allocated to common shareholders $ 60,836 $ 13,555 Undistributed earnings allocated to unvested share-based payment awards 387 90 Undistributed earnings $ 61,224 $ 13,645 Basic Distributed earnings to common shareholders $ 27,661 $ 28,264 Undistributed earnings allocated to common shareholders 60,836 13,555 Total common shareholders earnings, basic $ 88,497 $ 41,819 Diluted Distributed earnings to common shareholders $ 27,661 $ 28,264 Undistributed earnings allocated to common shareholders 60,836 13,555 Total common shareholders earnings, diluted $ 88,497 $ 41,819 Weighted average common shares outstanding 152,355 154,701 Effect of dilutive common stock awards 1,333 918 Diluted weighted average common shares outstanding 153,688 155,619 Basic earnings per common share $ 0.58 $ 0.27 Diluted earnings per common share $ 0.58 $ 0.27 Non-dilutive common stock options of approximately 3 million and 4 million for the three months ended March 31, 2021 and 2020, respectively, were excluded from the earnings per common share calculation.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Stock-Based Compensation	Stock-Based Compensation The fair values of stock options and restricted stock awards (including restricted stock units) are amortized as compensation expense on a straight-line basis over the vesting period of the grants. For colleagues who meet the definition of retirement eligible under the 2017 Incentive Compensation Plan and the 2020 Incentive Compensation Plan, expenses related to stock options and restricted stock awards are fully recognized on the date the colleague meets the definition of normal or early retirement. Compensation expense recognized is included in personnel expense on the consolidated statements of income. Assumptions are used in estimating the fair value of stock options granted. The weighted average expected life of the stock option represents the period of time stock options are expected to be outstanding and is estimated using historical data of stock option exercises and forfeitures. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is based on the implied volatility of the Corporation’s stock. The Corporation did not grant stock options in the first three months of 2021. The following assumptions were used in estimating the fair value for options granted for the full year 2020: 2020 Dividend yield 3.50 % Risk-free interest rate 1.60 % Weighted average expected volatility 21.00 % Weighted average expected life 5.75 years Weighted average per share fair value of options $2.39 A summary of the Corporation’s stock option activity for the three months ended March 31, 2021 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2020 6,473 $ 19.77 6.23 years $ 2,005 Exercised 615 15.96 Forfeited or expired 35 20.99 Outstanding at March 31, 2021 5,823 $ 20.17 6.21 years $ 13,099 Options Exercisable at March 31, 2021 4,240 $ 20.19 5.39 years $ 10,154 (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 three months ended March 31, 2021, the intrinsic value of stock options exercised was $3 million compared to less than $1 million for the three months ended March 31, 2020. The total fair value of stock options vested was $3 million for both the three months ended March 31, 2021 and 2020. The Corporation recognized compensation expense for the vesting of stock options of $403 thousand for the three months ended March 31, 2021, compared to $2 million for the three months ended March 31, 2020. Included in compensation expense for 2021 was no expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At March 31, 2021, the Corporation had approximately $2 million of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominately through the first quarter of 2024 . The Corporation also has issued time-based and performance-based restricted stock awards under the 2017 Incentive Compensation Plan and subsequent 2020 Incentive Compensation Plan. Performance awards are based on performance goals of earnings per share and total shareholder return with vesting ranging from a minimum of 0% to a maximum of 150% of the target award. Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date. The following table summarizes information about the Corporation’s restricted stock awards activity for the three months ended March 31, 2021: Restricted Stock Awards Shares (a) Weighted Average Outstanding at December 31, 2020 2,293 $ 20.70 Granted 771 19.59 Vested 571 21.69 Forfeited 28 24.13 Outstanding at March 31, 2021 2,466 $ 19.72 (a) In thousands The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant's award agreement. Performance-based restricted stock awards granted during 2020 and 2021 will vest ratably over a period of three years. Service-based restricted stock awards granted during 2020 and 2021 will vest ratably over a period of four years. Expense for restricted stock awards issued of approximately $3 million was recorded for the three months ended March 31, 2021 and $9 million was recorded for the three months ended March 31, 2020. Included in compensation expense for the first three months of 2021 was approximately $1 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $24 million of unrecognized compensation costs related to restricted stock awards at March 31, 2021 that are expected to be recognized over the remaining requisite service periods that extend predominately through the first quarter of 2025.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Investment securities are classified as AFS, HTM, or equity on the consolidated balance sheets at the time of purchase. The amortized cost and fair values of securities AFS and HTM at March 31, 2021 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 54,237 $ — $ (544) $ 53,693 Agency securities 15,000 — (96) 14,904 Obligations of state and political subdivisions (municipal securities) 411,964 21,218 — 433,182 Residential mortgage-related securities FNMA / FHLMC 1,910,644 5,956 (5,647) 1,910,954 GNMA 119,913 3,451 — 123,365 Commercial mortgage-related securities FNMA / FHLMC 93,902 2,330 (1,883) 94,349 GNMA 381,158 8,254 — 389,411 Asset backed securities FFELP 325,812 1,675 (1,554) 325,933 SBA 8,216 — (57) 8,160 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,323,846 $ 42,885 $ (9,782) $ 3,356,949 Investment securities HTM U. S. Treasury securities $ 1,000 $ 20 $ — $ 1,019 Obligations of state and political subdivisions (municipal securities) 1,455,462 106,933 (994) 1,561,401 Residential mortgage-related securities FNMA / FHLMC 47,480 2,471 — 49,951 GNMA 87,717 3,353 — 91,070 Commercial mortgage-related securities FNMA/FHLMC 63,844 157 (2,138) 61,863 GNMA 201,648 5,611 (21) 207,238 Total investment securities HTM $ 1,857,150 $ 118,544 $ (3,154) $ 1,972,541 The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U. S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943 Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The expected maturities of investment securities AFS and HTM at March 31, 2021, are shown below: AFS HTM ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 9,575 $ 9,588 $ 35,299 $ 35,587 Due after one year through five years 79,504 79,813 47,810 49,383 Due after five years through ten years 357,498 373,906 179,382 188,263 Due after ten years 37,624 41,472 1,193,970 1,289,186 Total debt securities 484,201 504,778 1,456,461 1,562,420 Residential mortgage-related securities FNMA / FHLMC 1,910,644 1,910,954 47,480 49,951 GNMA 119,913 123,365 87,717 91,070 Commercial mortgage-related securities FNMA / FHLMC 93,902 94,349 63,844 61,863 GNMA 381,158 389,411 201,648 207,238 Asset backed securities FFELP 325,812 325,933 — — SBA 8,216 8,160 — — Total investment securities $ 3,323,846 $ 3,356,949 $ 1,857,150 $ 1,972,541 Ratio of fair value to amortized cost 101.0 % 106.2 % 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 March 31, 2021: ($ in Thousands) AAA AA A Not Rated Total U. S. Treasury securities $ 1,000 $ — $ — $ — $ 1,000 Obligations of state and political subdivisions (municipal securities) 582,675 860,882 11,711 193 1,455,462 Residential mortgage-related securities FNMA / FHLMC 47,480 — — — 47,480 GNMA 87,717 — — — 87,717 Commercial mortgage-related securities FNMA / FHLMC 63,844 — — — 63,844 GNMA 201,648 — — — 201,648 Total HTM securities $ 984,363 $ 860,882 $ 11,711 $ 193 $ 1,857,150 The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2020: ($ in Thousands) AAA AA A Total U. S. Treasury securities $ 999 $ — $ — $ 999 Obligations of state and political subdivisions (municipal securities) 567,252 860,607 14,041 1,441,900 Residential mortgage-related securities FNMA / FHLMC 54,599 — — 54,599 GNMA 114,553 — — 114,553 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 — — 255,742 Total HTM securities $ 1,004,357 $ 860,607 $ 14,041 $ 1,879,005 Investment securities gains (losses), net includes proceeds from the sale of investment securities as well as any applicable write-ups or write-downs of investment securities. The proceeds from the sale of investment securities for the three months ended March 31, 2021 and 2020, are shown below: Three Months Ended March 31, ($ in Thousands) 2021 2020 Gross gains on AFS securities $ 36 $ 6,198 Gross (losses) on AFS securities (75) (80) Investment securities gains (losses), net $ (39) $ 6,118 Proceeds from sales of investment securities $ 51,295 $ 365,239 During the first quarter of 2021, the Corporation sold $51 million of lower yielding U.S. Treasury and Agency securities at a slight loss to take advantage of the steeper yield curve by reinvesting the proceeds into similar but higher yielding, longer duration securities. During the first quarter of 2020, the Corporation sold $281 million of primarily prepayment sensitive mortgage-related securities at a gain of $6 million. Additionally, in February 2020, the Corporation sold $84 million of certain securities acquired in the First Staunton acquisition that did not fit the parameters of the Corporation's current investment strategy. Investment securities with a carrying value of approximately $1.5 billion and $1.6 billion at March 31, 2021 and December 31, 2020, respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law. Accrued interest receivable on HTM securities totaled $12 million and $14 million at March 31, 2021 and December 31, 2020, respectively. Accrued interest receivable on AFS securities totaled $8 million at both March 31, 2021 and December 31, 2020. Accrued interest receivable on both HTM and AFS securities is included in interest receivable on the consolidated balance sheets. There was no interest income reversed for investments going into nonaccrual at both March 31, 2021 and 2020. A security is considered past due once it is 30 days past due under the terms of the agreement. At both March 31, 2021 and December 31, 2020, the Corporation had no past due HTM securities. The allowance for credit losses on HTM securities was approximately $63,000 at March 31, 2021 and approximately $67,000 at December 31, 2020, attributable entirely to the Corporation's municipal securities, included in investment securities HTM, net, at amortized cost on the consolidated balance sheets. The Corporation also holds U.S. Treasury and mortgage-related securities issued by the U.S. government or a GSE which are backed by the full faith and credit of the U.S. government and, as a result, no allowance for credit losses has been recorded related to these securities. The following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2021: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS U.S. Treasury securities 5 $ (544) $ 53,693 — $ — $ — $ (544) $ 53,693 Agency securities 1 (96) 14,904 — — — (96) 14,904 Obligations of state and political subdivisions (municipal securities) 1 — 910 — — — — 910 Residential mortgage-related securities FNMA / FHLMC 24 (5,647) 756,359 — — — (5,647) 756,359 GNMA 1 — 253 — — — — 253 Commercial mortgage-related securities FNMA / FHLMC 2 (1,883) 72,435 — — — (1,883) 72,435 GNMA 1 — 78 — — — — 78 Asset backed securities FFELP — — — 15 (1,554) 141,652 (1,554) 141,652 SBA — — — 14 (57) 7,750 (57) 7,750 Total 35 $ (8,171) $ 898,632 29 $ (1,611) $ 149,402 $ (9,782) $ 1,048,033 Investment securities HTM Obligations of state and political subdivisions (municipal securities) 33 $ (994) $ 62,908 — $ — $ — $ (994) $ 62,908 Commercial mortgage-related securities FNMA / FHLMC 6 (2,138) 41,105 — — — (2,138) 41,105 GNMA 2 (21) 22,205 — — — (21) 22,205 Total 41 $ (3,154) $ 126,218 — $ — $ — $ (3,154) $ 126,218 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS Residential mortgage-related securities FNMA / FHLMC 7 $ (500) $ 163,002 — $ — $ — $ (500) $ 163,002 GNMA 2 (3) 9,784 — — — (3) 9,784 GNMA commercial mortgage-related securities 1 — 287 — — — — 287 Asset backed securities FFELP 1 (129) 9,267 16 (2,885) 178,681 (3,013) 187,948 SBA 14 (53) 8,379 — — — (53) 8,379 Other debt securities 2 — 2,000 — — — — 2,000 Total 27 $ (685) $ 192,720 16 $ (2,885) $ 178,681 $ (3,570) $ 371,400 Investment securities HTM GNMA residential mortgage-related securities 1 $ — $ 325 — $ — $ — $ — $ 325 Total 1 $ — $ 325 — $ — $ — $ — $ 325 The Corporation reviews the AFS investment securities portfolio on a quarterly basis to monitor its credit exposure. A determination as to whether a security’s decline in fair value is the result of credit risk takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in the impairment analysis include the extent to which the security has been in an unrealized loss position, the change in security rating, financial condition and near-term prospects of the issuer, as well as the security and industry specific economic conditions. Based on the Corporation’s evaluation, management does not believe any unrealized losses at March 31, 2021 represent credit deterioration as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions. The U.S. Treasury 3 year and 5 year rates increased by 18 bp and 56 bp, respectively, from December 31, 2020. The Corporation does not intend to sell nor does it believe that it will be required to sell the securities in an unrealized loss position before recovery of their amortized cost basis. FHLB and Federal Reserve Bank stocks: The Corporation is required to maintain Federal Reserve Bank stock and FHLB stock as a member of both the Federal Reserve System and the FHLB, and in amounts as required by these institutions. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other marketable equity securities and their fair value is equal to amortized cost. The Corporation had FHLB stock of $82 million at both March 31, 2021 and December 31, 2020. The Corporation had Federal Reserve Bank stock of $87 million at both March 31, 2021 and December 31, 2020. Accrued interest receivable on FHLB stock totaled approximately $944,000 and approximately $972,000 at March 31, 2021 and December 31, 2020, respectively. There was approximately $370,000 of accrued interest receivable on Federal Reserve Bank stock at March 31, 2021 and none at December 31, 2020. Accrued interest receivable on both FHLB stock and Federal Reserve Bank stock is included in interest receivable on the consolidated balance sheets. Equity Securities Equity securities with readily determinable fair values: The Corporation's portfolio of equity securities with readily determinable fair values is primarily comprised of CRA Qualified Investment mutual funds. At both March 31, 2021 and December 31, 2020, the Corporation had equity securities with readily determinable fair values of $2 million.

Loans

Loans	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans	Loans The period end loan composition was as follows: ($ in Thousands) March 31, 2021 December 31, 2020 PPP $ 836,566 $ 767,757 Commercial and industrial 7,664,501 7,701,422 Commercial real estate — owner occupied 883,237 900,912 Commercial and business lending 9,384,303 9,370,091 Commercial real estate — investor 4,260,706 4,342,584 Real estate construction 1,882,299 1,840,417 Commercial real estate lending 6,143,004 6,183,001 Total commercial 15,527,307 15,553,091 Residential mortgage 7,685,218 7,878,324 Home equity 651,647 707,255 Other consumer 298,156 313,054 Total consumer 8,635,020 8,898,632 Total loans $ 24,162,328 $ 24,451,724 Accrued interest receivable on loans totaled $64 million at March 31, 2021, and $66 million at December 31, 2020, and is included in interest receivable on the consolidated balance sheets. Interest accrued but not received for loans placed on nonaccrual is reversed against interest income. The amount of accrued interest reversed totaled approximately $98,000 for the three months ended March 31, 2021, and approximately $327,000 for the three months ended March 31, 2020. The following table presents commercial and consumer loans by credit quality indicator by vintage year at March 31, 2021: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 281,120 $ 527,971 $ — $ — $ — $ — $ 809,091 Special Mention — — 1,642 3,434 — — — — 5,076 Potential Problem — — 9,450 12,948 — — — — 22,398 PPP $ — $ — $ 292,213 $ 544,353 $ — $ — $ — $ — $ 836,566 Commercial and industrial: Risk rating: Pass $ 2,009 $ 2,170,406 $ 378,782 $ 1,303,573 $ 1,333,680 $ 1,119,175 $ 389,390 $ 694,910 $ 7,389,917 Special Mention — 7,298 96 3,805 59,502 48,156 207 185 119,249 Potential Problem 1,800 20,492 4,166 17,407 34,437 37,587 1,761 6,294 122,143 Nonaccrual — — — 6,143 725 16,530 334 9,461 33,192 Commercial and industrial $ 3,809 $ 2,198,196 $ 383,045 $ 1,330,929 $ 1,428,343 $ 1,221,448 $ 391,692 $ 710,849 $ 7,664,501 Commercial real estate - owner occupied: Risk rating: Pass $ 11,868 $ 20,916 $ 59,551 $ 174,514 $ 210,032 $ 128,471 $ 81,020 $ 184,983 $ 859,487 Special Mention — — — 5,014 2,080 — 424 260 7,777 Potential Problem — 622 105 3,992 1,066 652 2,035 7,493 15,965 Nonaccrual — — — — — — — 7 7 Commercial real estate - owner occupied $ 11,868 $ 21,538 $ 59,656 $ 183,520 $ 213,178 $ 129,123 $ 83,479 $ 192,743 $ 883,237 Commercial and business lending: Risk rating: Pass $ 13,877 $ 2,191,322 $ 719,454 $ 2,006,059 $ 1,543,712 $ 1,247,646 $ 470,410 $ 879,893 $ 9,058,495 Special Mention — 7,298 1,738 12,253 61,582 48,156 631 444 132,102 Potential Problem 1,800 21,114 13,721 34,347 35,502 38,238 3,796 13,786 160,506 Nonaccrual — — — 6,143 725 16,530 334 9,468 33,200 Commercial and business lending $ 15,677 $ 2,219,734 $ 734,913 $ 2,058,802 $ 1,641,521 $ 1,350,571 $ 475,170 $ 903,592 $ 9,384,303 Commercial real estate - investor: Risk rating: Pass $ — $ 153,847 $ 344,412 $ 1,106,623 $ 989,271 $ 635,944 $ 208,367 $ 445,269 $ 3,883,733 Special Mention — — 1,776 83,975 104,806 16,161 8,897 17,121 232,735 Potential Problem — 802 5,473 52,576 8,952 1,787 2,840 13,321 85,752 Nonaccrual — — — 8,883 15,605 19,522 14,173 302 58,485 Commercial real estate - investor $ — $ 154,649 $ 351,662 $ 1,252,057 $ 1,118,634 $ 673,414 $ 234,276 $ 476,014 $ 4,260,706 Real estate construction: Risk rating: Pass $ 5,732 $ 26,865 $ 125,807 $ 756,890 $ 628,967 $ 228,127 $ 21,478 $ 16,815 $ 1,804,950 Special Mention — — — 529 3,648 58,826 42 — 63,045 Potential Problem — — 12 131 13,713 — — 119 13,977 Nonaccrual — — — — — — — 327 327 Real estate construction $ 5,732 $ 26,865 $ 125,819 $ 757,550 $ 646,328 $ 286,953 $ 21,520 $ 17,262 $ 1,882,299 Commercial real estate lending: Risk rating: Pass $ 5,732 $ 180,712 $ 470,219 $ 1,863,513 $ 1,618,239 $ 864,072 $ 229,845 $ 462,084 $ 5,688,683 Special Mention — — 1,776 84,504 108,453 74,987 8,939 17,121 295,780 Potential Problem — 802 5,486 52,708 22,665 1,787 2,840 13,440 99,728 Nonaccrual — — — 8,883 15,605 19,522 14,173 630 58,813 Commercial real estate lending $ 5,732 $ 181,515 $ 477,481 $ 2,009,607 $ 1,764,962 $ 960,368 $ 255,796 $ 493,275 $ 6,143,004 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total Total commercial: Risk rating: Pass $ 19,609 $ 2,372,034 $ 1,189,673 $ 3,869,571 $ 3,161,950 $ 2,111,718 $ 700,255 $ 1,341,977 $ 14,747,179 Special Mention — 7,298 3,514 96,757 170,035 123,143 9,569 17,565 427,882 Potential Problem 1,800 21,916 19,207 87,055 58,167 40,026 6,636 27,227 260,234 Nonaccrual — — — 15,026 16,330 36,052 14,507 10,098 92,012 Total commercial $ 21,409 $ 2,401,249 $ 1,212,394 $ 4,068,409 $ 3,406,483 $ 2,310,939 $ 730,967 $ 1,396,867 $ 15,527,307 Residential mortgage: Risk rating: Pass $ — $ — $ 449,381 $ 2,205,662 $ 1,280,604 $ 545,743 $ 881,884 $ 2,257,349 $ 7,620,622 Special Mention — — — 121 — 37 133 525 816 Potential Problem — — 72 510 561 674 126 582 2,524 Nonaccrual — — — 1,765 3,160 6,431 8,243 41,657 61,256 Residential mortgage $ — $ — $ 449,452 $ 2,208,058 $ 1,284,324 $ 552,885 $ 890,386 $ 2,300,113 $ 7,685,218 Home equity: Risk rating: Pass $ 1,891 $ 526,777 $ 71 $ 2,080 $ 11,595 $ 13,535 $ 10,333 $ 75,385 $ 639,776 Special Mention — 25 — — — 60 — 265 350 Potential Problem — 1,563 — — — 20 — 146 1,729 Nonaccrual 262 91 10 786 118 366 413 8,008 9,792 Home equity $ 2,153 $ 528,455 $ 81 $ 2,866 $ 11,713 $ 13,981 $ 10,745 $ 83,805 $ 651,647 Other consumer: Risk rating: Pass $ 171 $ 156,829 $ 1,908 $ 8,330 $ 8,674 $ 2,974 $ 1,351 $ 117,360 $ 297,427 Special Mention — 452 — — 40 — — 5 497 Nonaccrual 13 93 — 15 35 10 23 56 231 Other consumer $ 183 $ 157,375 $ 1,908 $ 8,345 $ 8,749 $ 2,984 $ 1,374 $ 117,421 $ 298,156 Total consumer: Risk rating: Pass $ 2,062 $ 683,606 $ 451,360 $ 2,216,072 $ 1,300,872 $ 562,252 $ 893,567 $ 2,450,094 $ 8,557,824 Special Mention — 477 — 121 40 96 133 795 1,663 Potential Problem — 1,563 72 510 561 694 126 728 4,254 Nonaccrual 274 184 10 2,566 3,313 6,807 8,678 49,722 71,280 Total consumer $ 2,336 $ 685,830 $ 451,442 $ 2,219,269 $ 1,304,787 $ 569,850 $ 902,504 $ 2,501,338 $ 8,635,020 Total loans: Risk rating: Pass $ 21,671 $ 3,055,640 $ 1,641,033 $ 6,085,644 $ 4,462,823 $ 2,673,970 $ 1,593,822 $ 3,792,071 $ 23,305,003 Special Mention — 7,775 3,514 96,877 170,076 123,240 9,703 18,360 429,545 Potential Problem 1,800 23,479 19,279 87,565 58,729 40,720 6,761 27,955 264,488 Nonaccrual 274 184 10 17,592 19,643 42,859 23,185 59,819 163,292 Total loans $ 23,745 $ 3,087,079 $ 1,663,836 $ 6,287,678 $ 4,711,270 $ 2,880,788 $ 1,633,471 $ 3,898,205 $ 24,162,328 (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. The following table presents commercial and consumer loans by credit quality indicator by vintage year at December 31, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 745,767 $ — $ — $ — $ — $ — $ 745,767 Special Mention — — 3,988 — — — — — 3,988 Potential Problem — — 18,002 — — — — — 18,002 PPP $ — $ — $ 767,757 $ — $ — $ — $ — $ — $ 767,757 Commercial and industrial: Risk rating: Pass $ 4,628 $ 2,177,138 $ 1,389,260 $ 1,435,519 $ 1,182,302 $ 483,957 $ 305,998 $ 453,734 $ 7,427,908 Special Mention — 10,159 2,719 39,854 37,042 113 215 67 90,169 Potential Problem 2,565 7,237 19,331 28,413 56,580 2,269 6,477 1,179 121,487 Nonaccrual 16,852 — 6,238 5,789 17,014 16,623 8,781 7,414 61,859 Commercial and industrial $ 24,045 $ 2,194,534 $ 1,417,548 $ 1,509,575 $ 1,292,938 $ 502,962 $ 321,471 $ 462,394 $ 7,701,422 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,022 $ 185,861 $ 209,069 $ 128,360 $ 99,546 $ 147,366 $ 79,111 $ 867,335 Special Mention — 113 1,882 3,122 300 658 264 — 6,339 Potential Problem — 3,486 4,104 8,916 — 1,490 4,437 3,747 26,179 Nonaccrual — — — — — 318 — 740 1,058 Commercial real estate - owner occupied $ 1,150 $ 21,621 $ 191,847 $ 221,107 $ 128,660 $ 102,012 $ 152,067 $ 83,598 $ 900,912 Commercial and business lending: Risk rating: Pass $ 5,778 $ 2,195,160 $ 2,320,888 $ 1,644,588 $ 1,310,662 $ 583,503 $ 453,364 $ 532,845 $ 9,041,009 Special Mention — 10,272 8,589 42,976 37,342 771 479 67 100,496 Potential Problem 2,565 10,723 41,437 37,329 56,580 3,759 10,915 4,926 165,668 Nonaccrual 16,852 — 6,238 5,789 17,014 16,941 8,781 8,154 62,917 Commercial and business lending $ 25,195 $ 2,216,154 $ 2,377,152 $ 1,730,682 $ 1,421,598 $ 604,974 $ 473,539 $ 545,992 $ 9,370,091 Commercial real estate - investor: Risk rating: Pass $ 10,971 $ 171,497 $ 1,249,644 $ 976,332 $ 720,237 $ 271,987 $ 341,658 $ 211,360 $ 3,942,714 Special Mention — — 90,235 97,333 12,339 — 21,882 8,465 230,254 Potential Problem — 838 16,343 13,575 30,911 2,279 239 27,209 91,396 Nonaccrual 19,803 — 10,141 53,056 446 14,267 — 309 78,220 Commercial real estate - investor $ 30,774 $ 172,335 $ 1,366,364 $ 1,140,297 $ 763,933 $ 288,533 $ 363,779 $ 247,343 $ 4,342,584 Real estate construction: Risk rating: Pass $ 776 $ 47,880 $ 645,925 $ 738,561 $ 294,910 $ 25,219 $ 2,420 $ 16,768 $ 1,771,682 Special Mention — — 487 494 48,283 42 — 30 49,336 Potential Problem — — 135 — 18,803 — 93 15 19,046 Nonaccrual — — — — — 16 — 338 353 Real estate construction $ 776 $ 47,880 $ 646,547 $ 739,055 $ 361,996 $ 25,277 $ 2,513 $ 17,150 $ 1,840,417 Commercial real estate lending: Risk rating: Pass $ 11,746 $ 219,377 $ 1,895,569 $ 1,714,893 $ 1,015,146 $ 297,205 $ 344,078 $ 228,127 $ 5,714,396 Special Mention — — 90,722 97,827 60,622 42 21,882 8,494 279,590 Potential Problem — 838 16,479 13,575 49,714 2,279 332 27,224 110,442 Nonaccrual 19,803 — 10,141 53,056 446 14,283 — 647 78,573 Commercial real estate lending $ 31,549 $ 220,215 $ 2,012,911 $ 1,879,352 $ 1,125,929 $ 313,810 $ 366,292 $ 264,493 $ 6,183,001 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 17,524 $ 2,414,537 $ 4,216,457 $ 3,359,482 $ 2,325,808 $ 880,708 $ 797,441 $ 760,973 $ 14,755,405 Special Mention — 10,272 99,311 140,803 97,964 813 22,361 8,562 380,086 Potential Problem 2,565 11,561 57,916 50,905 106,295 6,038 11,247 32,150 276,111 Nonaccrual 36,655 — 16,379 58,845 17,460 31,224 8,781 8,801 141,490 Total commercial $ 56,745 $ 2,436,370 $ 4,390,063 $ 3,610,033 $ 2,547,526 $ 918,783 $ 839,831 $ 810,485 $ 15,553,091 Residential mortgage: Risk rating: Pass $ — $ — $ 2,185,240 $ 1,490,589 $ 615,118 $ 998,072 $ 911,797 $ 1,612,971 $ 7,813,788 Special Mention — — — 355 330 102 126 537 1,450 Potential Problem — — 1,200 689 652 — 179 1,028 3,749 Nonaccrual — — 1,478 2,271 5,882 7,116 11,003 31,587 59,337 Residential mortgage $ — $ — $ 2,187,918 $ 1,493,903 $ 621,983 $ 1,005,290 $ 923,105 $ 1,646,124 $ 7,878,324 Home equity: Risk rating: Pass $ 10,224 $ 569,389 $ 2,057 $ 12,968 $ 15,792 $ 11,594 $ 5,803 $ 76,165 $ 693,767 Special Mention 596 631 — 39 14 39 4 804 1,532 Potential Problem — 1,922 — — — — — 146 2,068 Nonaccrual 1,600 100 965 134 410 319 711 7,249 9,888 Home equity $ 12,421 $ 572,041 $ 3,022 $ 13,141 $ 16,216 $ 11,952 $ 6,518 $ 84,364 $ 707,255 Other consumer: Risk rating: Pass $ 70 $ 165,114 $ 9,525 $ 10,309 $ 3,987 $ 1,872 $ 1,185 $ 120,425 $ 312,416 Special Mention 5 438 13 16 11 4 7 8 498 Nonaccrual 5 33 9 49 21 10 — 18 140 Other consumer $ 81 $ 165,585 $ 9,547 $ 10,374 $ 4,019 $ 1,886 $ 1,192 $ 120,451 $ 313,054 Total consumer: Risk rating: Pass $ 10,294 $ 734,502 $ 2,196,822 $ 1,513,865 $ 634,897 $ 1,011,539 $ 918,785 $ 1,809,561 $ 8,819,971 Special Mention 602 1,069 13 410 356 145 137 1,349 3,480 Potential Problem — 1,922 1,200 689 652 — 179 1,174 5,817 Nonaccrual 1,605 133 2,452 2,454 6,313 7,445 11,714 38,854 69,364 Total consumer $ 12,501 $ 737,626 $ 2,200,487 $ 1,517,417 $ 642,218 $ 1,019,128 $ 930,816 $ 1,850,939 $ 8,898,632 Total loans: Risk rating: Pass (c) $ 27,819 $ 3,149,039 $ 6,413,278 $ 4,873,347 $ 2,960,705 $ 1,892,247 $ 1,716,226 $ 2,570,534 $ 23,575,376 Special Mention 602 11,341 99,324 141,213 98,320 958 22,498 9,911 383,566 Potential Problem 2,565 13,483 59,116 51,593 106,947 6,038 11,426 33,324 281,928 Nonaccrual 38,260 133 18,831 61,298 23,773 38,669 20,496 47,655 210,854 Total loans $ 69,246 $ 3,173,996 $ 6,590,550 $ 5,127,451 $ 3,189,745 $ 1,937,912 $ 1,770,647 $ 2,661,424 $ 24,451,724 (b) The Corporation’s policy is to assign risk ratings at the borrower level. PPP loans are 100% guaranteed by the SBA and therefore the Corporation considers these loans to have a risk profile similar to pass rated loans. (c) Accruing TDRs are included in pass unless otherwise rated as special mention Factors that are important to managing overall credit quality are sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, and appropriate policies for allowance for loan losses, allowance for unfunded commitments, nonaccrual loans, and charge offs. For commercial loans, management has determined the pass credit quality indicator to include credits exhibiting acceptable financial statements, cash flow, and leverage. If any risk exists, it is mitigated by the loan structure, collateral, monitoring, or control. For consumer loans, performing loans include credits performing in accordance with the original contractual terms. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Special mention credits have potential weaknesses that deserve management’s attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Potential problem loans are considered inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged. These loans generally have a well-defined weakness, or weaknesses, which may jeopardize liquidation of the debt, and are characterized by the distinct possibility the Corporation will sustain some loss if the deficiencies are not corrected. Management has determined commercial loan relationships in nonaccrual status, and commercial and consumer loan relationships with their terms restructured in a TDR, meet the criteria to be individually evaluated. Commercial loans classified as special mention, potential problem, and nonaccrual are reviewed at a minimum on a quarterly basis, while pass credits, which are performing rated credits, are generally reviewed on an annual basis or more frequently if the loan renewal is less than one year or if otherwise warranted. The following table presents loans by past due status at March 31, 2021: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 836,566 $ — $ — $ — $ — $ 836,566 Commercial and industrial 7,630,593 444 82 190 33,192 7,664,501 Commercial real estate - owner occupied 883,229 — — — 7 883,237 Commercial and business lending 9,350,388 444 82 190 33,200 9,384,303 Commercial real estate - investor 4,196,221 5,999 — — 58,485 4,260,706 Real estate construction 1,880,995 977 — — 327 1,882,299 Commercial real estate lending 6,077,216 6,976 — — 58,813 6,143,004 Total commercial 15,427,603 7,420 82 190 92,012 15,527,307 Residential mortgage 7,619,602 3,494 479 387 61,256 7,685,218 Home equity 639,503 2,002 350 — 9,792 651,647 Other consumer 295,556 681 589 1,098 231 298,156 Total consumer 8,554,661 6,177 1,417 1,485 71,280 8,635,020 Total loans $ 23,982,264 $ 13,597 $ 1,500 $ 1,675 $ 163,292 $ 24,162,328 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $99 million, or 61%, were current with respect to payment at March 31, 2021. (c) No interest income was recognized on nonaccrual loans for the three months ended March 31, 2021. In addition, there were $16 million of nonaccrual loans for which there was no related ACLL at March 31, 2021. The following table presents loans by past due status at December 31, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 767,757 $ — $ — $ — $ — $ 767,757 Commercial and industrial 7,633,269 2,819 3,300 175 61,859 7,701,422 Commercial real estate - owner occupied 899,480 158 215 — 1,058 900,912 Commercial and business lending 9,300,506 2,977 3,516 175 62,917 9,370,091 Commercial real estate - investor 4,251,571 1,024 11,769 — 78,220 4,342,584 Real estate construction 1,839,073 991 — — 353 1,840,417 Commercial real estate lending 6,090,644 2,015 11,769 — 78,573 6,183,001 Total commercial 15,391,150 4,992 15,284 175 141,490 15,553,091 Residential mortgage 7,808,294 8,975 1,410 308 59,337 7,878,324 Home equity 692,565 3,071 1,731 — 9,888 707,255 Other consumer 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 4013 of the CARES Act. (b) Of the total nonaccrual loans, $128 million, or 61%, were current with respect to payment at December 31, 2020. (c) No interest income was recognized on nonaccrual loans for the year ended December 31, 2020. In addition, there were $28 million of nonaccrual loans for which there was no related ACLL at December 31, 2020. Troubled Debt Restructurings Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The following table presents nonaccrual and performing restructured loans by loan portfolio: March 31, 2021 December 31, 2020 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 11,985 $ 2,114 $ 12,713 $ 6,967 Commercial real estate — owner occupied 1,488 — 1,711 — Commercial real estate — investor 13,627 220 26,435 225 Real estate construction 256 109 260 111 Residential mortgage 10,462 13,537 7,825 11,509 Home equity 1,929 1,644 1,957 1,379 Other consumer 1,073 — 1,191 — Total restructured loans (b) $ 40,820 $ 17,624 $ 52,092 $ 20,190 (a) Nonaccrual restructured loans have been included within nonaccrual loans. The Corporation had a recorded investment of $6 million in loans modified as TDRs during the three months ended March 31, 2021, of which $3 million were in accrual status, included in pass or special mention based on their risk rating within the credit quality tables, and $3 million were in nonaccrual, within the credit quality tables, pending a sustained period of repayment. Short-term loan modifications made in good faith to help ease the adverse effects of the COVID-19 pandemic are not categorized as TDRs in accordance with the CARES Act. The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 Three Months Ended March 31, 2020 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial — $ — $ — 1 $ 48 $ 48 Commercial real estate — owner occupied — — — 1 290 321 Commercial real estate — investor 4 1,693 1,693 1 570 1,740 Real estate construction — — — 1 122 122 Residential mortgage 20 3,876 3,902 18 3,592 3,668 Home equity 1 430 430 8 277 277 Total loans modified 25 $ 5,999 $ 6,025 30 $ 4,899 $ 6,175 (a) Represents post-modification outstanding recorded investment. (b) Represents pre-modification outstanding recorded investment. Restructured loan modifications may include payment schedule modifications, interest rate concessions, maturity date extensions, modification of note structure (A/B Note), non-reaffirmed Chapter 7 bankruptcies, principal reduction, or some combination of these concessions. During the three months ended March 31, 2021, restructured loan modifications of commercial loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of consumer loans primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the three months ended March 31, 2021. The following table provides the number of loans modified in a TDR during the previous twelve months which subsequently defaulted during the three months ended March 31, 2021 and 2020, and the recorded investment in these restructured loans as of March 31, 2021 and 2020: Three Months Ended March 31, 2021 Three Months Ended March 31, 2020 ($ in Thousands) Number of Recorded Number of Recorded Residential mortgage 1 97 3 388 Home equity — — 2 88 Total loans modified 1 $ 97 5 $ 476 All loans modified in a TDR are individually evaluated for impairment. The nature and extent of the impairment of restructured loans, including those which have experienced a subsequent payment default, are considered in the determination of an appropriate level of the ACLL. The Corporation analyzes loans for classification as a probable TDR. This analysis includes identifying customers that are showing possible liquidity issues in the near term without reasonable access to alternative sources of capital. At March 31, 2021, the Corporation had $49 million in loans meeting this classification compared to $68 million at December 31, 2020. Of the loans classified as probable TDRs at March 31, 2021, $36 million were related to the commercial and industrial portfolio and $13 million were related to the CRE portfolio. Allowance for Credit Losses on Loans The ACLL is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the ACLL represents management’s estimate of an amount appropriate to provide for expected lifetime credit losses in the loan portfolio at the balance sheet date. The expected lifetime credit losses are the product of multiplying the Corporation's estimates of probability of default, loss given default, and the individual loan level exposure at default on an undiscounted basis. A main factor in the determination of the ACLL is the economic forecast. The Corporation utilized Moody's baseline forecast, updated during March 2021, in the allowance model. The forecast is applied over a 2 year reasonable and supportable period with straight-line reversion to the historical losses over the second year of the period. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit). See Note 12 for additional information on the change in the allowance for unfunded commitments. The following table presents a summary of the changes in the ACLL by portfolio segment for the three months ended March 31, 2021: ($ in Thousands) December 31, 2020 Charge offs Recoveries Net Charge offs Provision for credit losses March 31, 2021 ACLL / Loans Allowance for loan losses PPP $ 531 $ — $ — $ — $ 76 $ 607 Commercial and industrial 142,793 (3,123) 4,490 1,367 (19,453) 124,707 Commercial real estate — owner occupied 11,274 — 4 4 508 11,786 Commercial and business lending 154,598 (3,123) 4,494 1,370 (18,869) 137,099 Commercial real estate — investor 93,435 (8,739) 2,854 (5,886) 1,694 89,243 Real estate construction 59,193 (3) 31 29 (4,979) 54,243 Commercial real estate lending 152,629 (8,742) 2,885 (5,857) (3,286) 143,486 Total commercial 307,226 (11,865) 7,379 (4,487) (22,155) 280,585 Residential mortgage 42,996 (243) 134 (109) 2,328 45,215 Home equity 18,849 (238) 583 344 (2,822) 16,371 Other consumer 14,630 (827) 315 (511) (3,351) 10,767 Total consumer 76,475 (1,308) 1,031 (277) (3,845) 72,353 Total loans $ 383,702 $ (13,174) $ 8,410 $ (4,764) $ (26,000) $ 352,938 Allowance for unfunded commitments Commercial and industrial 22,311 — — — 2,417 24,728 Commercial real estate — owner occupied 266 — — — 38 304 Commercial and business lending 22,577 — — — 2,455 25,033 Commercial real estate — investor 636 — — — 15 651 Real estate construction 18,887 — — — 422 19,309 Commercial real estate lending 19,523 — — — 437 19,960 Total commercial 42,101 — — — 2,892 44,993 Home equity 3,118 — — — (199) 2,919 Other consumer 2,557 — — — 307 2,865 Total consumer 5,675 — — — 108 5,783 Total loans $ 47,776 $ — $ — $ — $ 3,000 $ 50,776 Allowance for credit losses on loans PPP $ 531 $ — $ — $ — $ 76 $ 607 0.07 % Commercial and industrial 165,105 (3,123) 4,490 1,367 (17,037) 149,435 1.95 % Commercial real estate — owner occupied 11,539 — 4 4 547 12,090 1.37 % Commercial and business lending 177,175 (3,123) 4,494 1,370 (16,414) 162,132 1.73 % Commercial real estate — investor 94,071 (8,739) 2,854 (5,886) 1,709 89,894 2.11 % Real estate construction 78,080 (3) 31 29 (4,557) 73,552 3.91 % Commercial real estate lending 172,152 (8,742) 2,885 (5,857) (2,849) 163,446 2.66 % Total commercial 349,327 (11,865) 7,379 (4,487) (19,262) 325,578 2.10 % Residential mortgage 42,996 (243) 134 (109) 2,328 45,215 0.59 % Home equity 21,967 (238) 583 344 (3,021) 19,290 2.96 % Other consumer 17,187 (827) 315 (511) (3,044) 13,631 4.57 % Total consumer 82,150 (1,308) 1,031 (277) (3,738) 78,136 0.90 % Total loans $ 431,478 $ (13,174) $ 8,410 $ (4,764) $ (23,000) $ 403,714 1.67 % 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) 18,887 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 (7,179) 19,523 Total commercial 20,465 14,595 35,060 — — — — 112 6,929 42,101 Home equity 1,038 2,591 3,629 — — — — 66 (577) 3,118 Other consumer 405 1,504 1,909 — — — — — 649 2,557 Total consumer 1,443 4,095 5,538 — — — — 66 72 5,675 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 7,000 $ 47,776 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 0.07 % Commercial and industrial 103,409 48,921 152,330 (80,320) 7,004 (73,316) 293 469 85,327 165,105 2.14 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 147 (272) 890 259 2,102 11,539 1.28 % Commercial and business lending 113,820 47,070 160,890 (80,739) 7,151 (73,588) 1,183 728 87,961 177,175 1.89 % Commercial real estate — investor 41,044 2,287 43,331 (22,920) 643 (22,277) 753 474 71,792 94,071 2.17 % Real estate construction 32,447 25,814 58,261 (19) 49 31 435 537 18,816 78,080 4.24 % Commercial real estate lending 73,490 28,101 101,591 (22,938) 692 (22,246) 1,188 1,011 90,608 172,152 2.78 % Total commercial 187,311 75,171 262,482 (103,677) 7,844 (95,834) 2,371 1,739 178,569 349,327 2.25 % Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 0.55 % Home equity 11,964 14,240 26,204 (1,719) 1,978 259 422 440 (5,358) 21,967 3.11 % Other consumer 7,044 8,520 15,564 (4,790) 1,101 (3,689) 61 140 5,111 17,187 5.49 % Total consumer 35,968 55,975 91,943 (8,376) 3,579 (4,797) 1,134 983 (7,112) 82,150 0.92 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,722 $ 171,457 $ 431,478 1.76 % Loans Acquired in Acquisitions Loans acquired in a business combination after January 1, 2020 are recorded in accordance with ASC Topic 326. See Note 2 for more information on loans acquired in a business combination. After January 1, 2020, acquired loans were segregated into two types: • Non-PCD loans are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not show evidence of credit deterioration since origination. The allowance for loan losses on these loans is recorded through provision for credit losses on the consolidated statements of income at acquisition. • PCD loans are loans demonstrating more than insignificant credit deterioration and are accounted for with ASC Topic 326-30. Under this guidance, the credit mark on acquired assets grosses up the ACLL and the amortized cost of the loan.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill Goodwill is not amortized but is instead subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Corporation conducted its most recent annual impairment testing in May 2020, utilizing a quantitative assessment of goodwill impairment which included determining the estimated fair value of each reporting unit, utilizing an equally weighted combination of discounted cash flow and market-based approaches, and comparing that fair value to each reporting unit’s carrying amount (including goodwill). An impairment loss is recognized if the carrying amount of a reporting unit exceeds its fair value. Based on the quantitative assessment, management concluded that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, based on the step one quantitative analysis, no impairment was required. There have been no events since the May 2020 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2020 or the first three months of 2021. 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 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 deterioration in the economic environment, may necessitate additional interim testing, which could result in an impairment charge to goodwill in future reporting periods. At both March 31, 2021 and December 31, 2020, the Corporation had goodwill of $1.1 billion. During the first quarter of 2021, there was a reduction of $4 million related to the sale of Whitnell. Other Intangible Assets The Corporation has other intangible assets that are amortized, consisting of CDIs and MSRs. For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) Three Months Ended March 31, 2021 Year Ended December 31, 2020 Core deposit intangibles Gross carrying amount at the beginning of the year $ 88,109 $ 80,730 Additions during the period — 7,379 Accumulated amortization (23,408) (21,205) Net book value $ 64,701 $ 66,904 Amortization during the year $ 2,203 $ 8,749 Other intangibles Gross carrying amount at the beginning of the year $ 2,000 $ 38,970 Additions during the period — 200 Reductions due to sale (1,317) (17,435) Accumulated amortization (683) (20,385) Net book value $ — $ 1,350 Amortization during the year $ 33 $ 1,443 Mortgage Servicing Rights The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. MSRs are amortized in proportion to and over the period of estimated net servicing income and assessed for impairment at each reporting date. The Corporation evaluates its MSRs asset for impairment at minimum on a quarterly basis. Impairment is assessed based on fair value at each reporting date using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). As mortgage interest rates fall, prepayment speeds are usually faster and the value of the MSRs asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the MSRs asset generally increases, requiring less valuation reserve. A valuation allowance is established, through a charge to earnings, to the extent the amortized cost of the MSRs exceeds the estimated fair value by stratification. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the MSRs asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the MSRs asset and valuation allowance, precluding subsequent recoveries. See Note 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 which further discusses fair value measurement relative to the MSRs asset. A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows: ($ in Thousands) Three Months Ended March 31, 2021 Year Ended December 31, 2020 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 59,967 $ 67,607 Additions from acquisition — 1,357 Additions 3,348 13,667 Amortization (6,388) (22,664) Mortgage servicing rights at end of period $ 56,927 $ 59,967 Valuation allowance at beginning of period $ (18,006) $ (302) (Additions) recoveries, net 10,578 (17,704) Valuation allowance at end of period $ (7,428) $ (18,006) Mortgage servicing rights, net $ 49,500 $ 41,961 Fair value of mortgage servicing rights $ 49,541 $ 41,990 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,313,308 $ 7,743,956 Mortgage servicing rights, net to servicing portfolio 0.68 % 0.54 % Mortgage servicing rights expense (a) $ (4,190) $ 40,369 (a) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net on the consolidated statements of income. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2021. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. The following table shows the estimated future amortization expense for amortizing intangible assets: ($ in Thousands) Core Deposit Intangibles Mortgage Servicing Rights Nine Months Ending December 31, 2021 $ 6,608 $ 8,345 2022 8,811 11,550 2023 8,811 8,909 2024 8,811 6,983 2025 8,811 5,547 2026 8,811 4,466 Beyond 2026 14,038 11,125 Total Estimated Amortization Expense $ 64,701 $ 56,927

Short and Long-Term Funding

Short and Long-Term Funding	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Short and Long-Term Funding	Short and Long-Term Funding The following table presents the components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year): ($ in Thousands) March 31, 2021 December 31, 2020 Short-Term Funding Federal funds purchased $ 7,450 $ 7,070 Securities sold under agreements to repurchase 131,057 185,901 Federal funds purchased and securities sold under agreements to repurchase 138,507 192,971 Commercial paper 51,171 59,346 Total short-term funding $ 189,678 $ 252,317 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 1,091 1,128 Capitalized costs (1,362) (1,663) FHLB advances 1,629,966 $ 1,632,723 Total long-term funding 2,179,694 2,182,188 Total short and long-term funding $ 2,369,372 $ 2,434,505 Securities Sold Under Agreements to Repurchase The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). See Note 11 for additional disclosures on balance sheet offsetting. The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of March 31, 2021, the Corporation pledged agency mortgage-related securities with a fair value of $192 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities. The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of March 31, 2021 and December 31, 2020 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total March 31, 2021 Repurchase agreements Agency mortgage-related securities $ 131,057 $ — $ — $ — $ 131,057 Total $ 131,057 $ — $ — $ — $ 131,057 December 31, 2020 Repurchase agreements Agency mortgage-related securities $ 185,901 $ — $ — $ — $ 185,901 Total $ 185,901 $ — $ — $ — $ 185,901 Long-Term Funding Senior Notes In August 2018, the Bank issued $300 million of senior notes, due August 2021, and callable July 2021. The senior notes 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. Finance Leases In connection with the construction of new branches in Oshkosh and Eau Claire, Wisconsin, the Corporation entered into land leases with options to purchase the underlying land for a fixed price, which the Corporation now expects to exercise. The finance leases have fixed interest rates of approximately 1.00%. See Note 18 for additional disclosure regarding the Corporation’s leases.

Derivative and Hedging Activiti

Derivative and Hedging Activities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities The Corporation is exposed to certain risk arising from both its business operations and economic conditions. The Corporation principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Corporation manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Corporation enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Corporation's derivative financial instruments are used to manage differences in the amount, timing, and duration of the Corporation's known or expected cash receipts and its known or expected cash payments principally related to the Corporation's assets. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. The Corporation is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. To mitigate the counterparty risk, contracts generally contain language outlining collateral pledging requirements for each counterparty. For non-centrally cleared derivatives, collateral must be posted when the market value exceeds certain mutually agreed upon threshold limits. Securities and cash are often pledged as collateral. The Corporation pledged $67 million of investment securities as collateral at March 31, 2021, and pledged $72 million of investment securities as collateral at December 31, 2020. At March 31, 2021, the Corporation posted $21 million of cash collateral compared to $31 million at December 31, 2020. Federal regulations require the Corporation to clear all LIBOR interest rate swaps through a clearing house, if possible. For derivatives cleared through central clearing houses, the variation margin payments are legally characterized as daily settlements of the derivative rather than collateral. The Corporation's clearing agent for interest rate derivative contracts that are centrally cleared through the Chicago Mercantile Exchange (CME) and the London Clearing House (LCH) settles the variation margin daily. As a result, the variation margin payment and the related derivative instruments are considered a single unit of account for accounting and financial reporting purposes. Depending on the net position, the fair value is reported in other assets or accrued expenses and other liabilities on the consolidated balance sheets. The daily settlement of the derivative exposure does not change or reset the contractual terms of the instrument. Fair Value Hedges of Interest Rate Risk The Corporation is exposed to changes in the fair value of certain of its pools of prepayable fixed-rate assets due to changes in benchmark interest rates. The Corporation used interest rate swaps to manage its exposure to changes in fair value on these instruments attributable to changes in the designated benchmark interest rate. Interest rate swaps designated as fair value hedges involved the payment of fixed-rate amounts to a counterparty in exchange for the Corporation receiving variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk were recognized in interest income. During the fourth quarter of 2019, the Corporation terminated the outstanding fair value hedges. Derivatives to Accommodate Customer Needs The Corporation also facilitates customer borrowing activity by entering into various derivative contracts which are designated as free standing derivative contracts. Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk, foreign currency, and commodity prices. These derivative contracts are not designated against specific assets and liabilities on the consolidated balance sheets or forecasted transactions and, therefore, do not qualify for hedge accounting treatment. Such derivative contracts are carried at fair value in other assets and accrued expenses and other liabilities on the consolidated balance sheets with changes in the fair value recorded as a component of capital markets, net, and typically include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, and commodity contracts. See Note 11 for additional information and disclosures on balance sheet offsetting. Interest rate-related instruments: The Corporation provides interest rate risk management services to commercial customers, primarily forward interest rate swaps and caps. The Corporation’s market risk from unfavorable movements in interest rates related to these derivative contracts is generally economically hedged by concurrently entering into offsetting derivative contracts. The offsetting derivative contracts have identical notional values, terms, and indices. Foreign currency exchange forwards: The Corporation provides foreign currency exchange services to customers, primarily forward contracts. The Corporation's customers enter into a foreign currency exchange forward with the Corporation as a means for them to mitigate exchange rate risk. The Corporation mitigates its risk by then entering into an offsetting foreign currency exchange derivative contract. Commodity contracts: Commodity contracts are entered into primarily for the benefit of commercial customers seeking to manage their exposure to fluctuating commodity prices. The Corporation mitigates its risk by then entering into an offsetting commodity derivative contract. Mortgage Derivatives Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded in other assets and accrued expenses and other liabilities on the consolidated balance sheets with the changes in fair value recorded as a component of mortgage banking, net. The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments as of March 31, 2021 and December 31, 2020. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of March 31, 2021 and December 31, 2020. The resulting net derivative asset and liability fair values are included in other assets and accrued expenses and other liabilities, respectively, on the consolidated balance sheets. March 31, 2021 December 31, 2020 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Not designated as hedging instruments Interest rate-related instruments $ 3,654,732 $ 121,020 $ 3,654,732 $ 28,382 $ 3,639,679 $ 192,518 $ 3,639,679 $ 25,680 Foreign currency exchange forwards 448,395 3,044 439,381 2,828 411,292 4,909 398,890 4,836 Commodity contracts 70,633 5,808 70,758 5,098 87,547 12,486 83,214 11,155 Mortgage banking (a)(b) 292,704 11,171 408,500 — 226,818 9,624 335,500 2,046 Gross derivatives before netting $ 141,043 $ 36,308 $ 219,537 $ 43,716 Less: Legally enforceable master netting agreements 2,643 2,643 1,936 1,936 Less: Cash collateral pledged/received 1,581 17,583 10,879 25,625 Total derivative instruments, after netting $ 136,819 $ 16,082 $ 206,722 $ 16,155 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. (b) Includes $4 million forward commitment fair value. The Corporation terminated its $500 million fair value hedge during the fourth quarter of 2019. At March 31, 2021, the amortized cost basis of the closed portfolios which had previously been used in the terminated hedging relationship was $534 million and is included in loans and investment securities, AFS, at fair value on the consolidated balance sheets. This amount includes $3 million of hedging adjustments on the discontinued hedging relationships. The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three months ended March 31, 2021 and 2020: Location and Amount of Gain or (Loss) Recognized in Income on Three Months Ended March 31, 2021 2020 ($ 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 the fair value hedge is recorded $ (485) $ — $ (322) $ (262) The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (485) — (322) (262) Derivatives designated as hedging instruments (a) — — — — (a) Includes net settlements on the derivatives. The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income for the three months ended March 31, 2021 and 2020: Consolidated Statements of Income Category of Three Months Ended March 31, ($ in Thousands) 2021 2020 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ 2,938 $ (3,090) Foreign currency exchange forwards Capital markets, net 143 (122) Commodity contracts Capital markets, net (621) 746 Interest rate lock commitments (mortgage) Mortgage banking, net (2,708) 9,928 Forward commitments (mortgage) Mortgage banking, net (6,300) (10,262)

Balance Sheet Offsetting

Balance Sheet Offsetting	3 Months Ended
	Mar. 31, 2021
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet Offsetting Interest Rate-Related Instruments, Commodity Contracts, and Foreign Exchange Forwards (“Interest, Commodity, and Foreign Exchange Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers, commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, and foreign exchange forwards to manage customers' exposure to fluctuating foreign exchange rates. The Corporation mitigates these risks by entering into equal and offsetting agreements with highly rated third-party financial institutions. The Corporation is party to master netting arrangements with its financial institution counterparties that create single net settlements of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest, commodity, and foreign exchange agreements. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. Derivatives subject to a legally enforceable master netting agreement are reported on a net basis, net of cash collateral, in other assets and accrued expenses and other liabilities, on the face of the consolidated balance sheets. See Note 10 for additional information on the Corporation’s derivative and hedging activities. Securities Sold Under Agreements to Repurchase The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The right of set-off for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). In addition, the Corporation does not enter into reverse repurchase agreements; therefore, there is no such offsetting to be done with the repurchase agreements. See Note 9 for additional disclosures on repurchase agreements. The following table presents the interest rate, commodity, and foreign exchange assets and liabilities subject to an enforceable master netting arrangement. The interest, commodity and foreign exchange agreements the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement and are therefore excluded from this table: Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Received Net Amount Derivative assets March 31, 2021 $ 4,496 $ (2,643) $ (1,581) $ 272 $ — $ 272 December 31, 2020 13,441 (1,936) (10,879) 626 — 626 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Pledged Net Amount Derivative liabilities March 31, 2021 $ 20,393 $ (2,643) $ (17,583) $ 167 $ — $ 167 December 31, 2020 27,951 (1,936) (25,625) 390 — 390

Commitments, Off-Balance Sheet

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters	Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related and other commitments (see below) as well as derivative instruments (see Note 10). The following is a summary of lending-related commitments: ($ in Thousands) March 31, 2021 December 31, 2020 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 10,102,713 $ 10,010,492 Commercial letters of credit (a) 7,301 3,642 Standby letters of credit (c) 247,473 278,798 (a) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and was not material at March 31, 2021 or December 31, 2020. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10. (c) The Corporation has established a liability of $3 million for both March 31, 2021 and December 31, 2020, as an estimate of the fair value of these financial instruments. Lending-related Commitments As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb expected lifetime losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Three Months Ended March 31, 2021 Year Ended December 31, 2020 Allowance for Unfunded Commitments Balance at beginning of period $ 47,776 $ 21,907 Cumulative effect of ASU 2016-13 adoption (CECL) N/A 18,690 Balance at beginning of period, adjusted 47,776 40,597 Provision for unfunded commitments 3,000 7,000 Amount recorded at acquisition — 179 Balance at end of period $ 50,776 $ 47,776 Lending-related commitments include commitments to extend credit, commitments to originate residential mortgage loans held for sale, commercial letters of credit, and standby letters of credit. Commitments to extend credit are legally binding agreements to lend to customers at predetermined interest rates, as long as there is no violation of any condition established in the contracts. Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded on the consolidated balance sheets. The Corporation’s derivative and hedging activity is further described in Note 10. Commercial and standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party, while standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party. Other Commitments The Corporation invests in qualified affordable housing projects, federal and state historic projects, new market projects, and opportunity zone funds for the purpose of community reinvestment and obtaining tax credits and other tax benefits. Return on the Corporation's investment in these projects and funds comes in the form of the tax credits and tax losses that pass through to the Corporation, and deferral or elimination of capital gain recognition for tax purposes. The aggregate carrying value of these investments at March 31, 2021 was $280 million, compared to $272 million at December 31, 2020, included in tax credit and other investments on the consolidated balance sheets. The Corporation utilizes the proportional amortization method to account for investments in qualified affordable housing projects. Under the proportional amortization method, the Corporation amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits. The Corporation recognized additional income tax expense attributable to the amortization of investments in qualified affordable housing projects of $8 million and $6 million for the three months ended March 31, 2021 and 2020, respectively. The Corporation's remaining investment in qualified affordable housing projects accounted for under the proportional amortization method totaled $277 million at March 31, 2021 and $268 million at December 31, 2020. 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 $119 million and $118 million at March 31, 2021 and December 31, 2020, respectively. For the three months ended March 31, 2021 and the year ended December 31, 2020, the Corporation did not record any impairment related to qualified affordable housing investments. The Corporation has principal investment commitments to provide capital-based financing to private and public companies through either direct investment in specific companies or through investment funds and partnerships. The timing of future cash requirements to fund such principal investment commitments is generally dependent on the investment cycle, whereby privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, which can vary based on overall market conditions, as well as the nature and type of industry in which the companies operate. The Corporation also invests in loan pools that support CRA loans. The timing of future cash requirements to fund these pools is dependent upon loan demand, which can vary over time. The aggregate carrying value of these investments was $23 million and $25 million at March 31, 2021 and December 31, 2020, respectively, included in tax credit and other investments on the consolidated balance sheets. Legal Proceedings The Corporation is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which involve claims for substantial amounts. Although there can be no assurance as to the ultimate outcomes, the Corporation believes it has meritorious defenses to the claims asserted against it in its currently outstanding matters and intends to continue to defend itself vigorously with respect to such legal proceedings. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of the Corporation and its shareholders. On at least a quarterly basis, the Corporation assesses its liabilities and contingencies in connection with all pending or threatened claims and litigation, utilizing the most recent information available. On a matter by matter basis, an accrual for loss is established for those matters which the Corporation believes it is probable that a loss may be incurred and that the amount of such loss can be reasonably estimated. Once established, each accrual is adjusted as appropriate to reflect any subsequent developments. Accordingly, management’s estimate will change from time to time, and actual losses may be more or less than the current estimate. For matters where a loss is not probable, or the amount of the loss cannot be estimated, no accrual is established. Resolution of legal claims is inherently unpredictable, and in many legal proceedings various factors exacerbate this inherent unpredictability, including where the damages sought are unsubstantiated or indeterminate, it is unclear whether a case brought as a class action will be allowed to proceed on that basis, discovery is not complete, the proceeding is not yet in its final stages, the matters present legal uncertainties, there are significant facts in dispute, there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants), or there is a wide range of potential results. A lawsuit, Evans et al v. Associated Banc-Corp et al , was filed in the United States District Court for the Eastern District of Wisconsin - Green Bay Division on January 13, 2021 by one current and one former participant in the Associated Banc-Corp 401(k) and Employee Stock Ownership Plan (the “Plan”) as representatives of a putative class. The plaintiffs alleged that Associated Banc-Corp, the Associated Banc-Corp Plan Administrative Committee, and current and past members of such committee during the relevant time period (the “Defendants”) breached their fiduciary duties with respect to the Plan in violation of Employee Retirement Income Security Act of 1974, as amended, by applying an imprudent and inappropriate preference for products associated with Associated Banc-Corp within the Plan, and that the Defendants failed to monitor or control the recordkeeping expenses paid to Associated Trust Company, N.A. On March 18, 2021, the Defendants filed a motion to dismiss. On April 8, 2021, the plaintiffs filed an amended complaint which dropped the record keeping claim, added Associated Trust Company N.A. and Kellogg Asset Management, LLC as defendants, and alleged various breaches of fiduciary duty related to the selection and monitoring of, and the fees charged by, proprietary collective investment trusts. The plaintiffs, in part, seek an accounting and disgorgement of certain profits, as well as certain equitable restitution and equitable monetary relief. The Corporation intends to vigorously defend against this lawsuit. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time with respect to this lawsuit. Regulatory Matters A variety of consumer products, including mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters. Mortgage Repurchase Reserve The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under the Corporation's usual underwriting procedures, and are most often sold on a nonrecourse basis, primarily to the GSEs. The Corporation’s agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold, related to credit information, loan documentation, collateral, and insurability. Subsequent to being sold, if a material underwriting deficiency or documentation defect is discovered, the Corporation may be obligated to repurchase the loan or reimburse the GSEs for losses incurred (collectively, “make whole requests”). The make whole requests and any related risk of loss under the representations and warranties are largely driven by borrower performance. As a result of make whole requests, the Corporation has repurchased loans with aggregate principal balances of $2 million and $10 million for the three months ended March 31, 2021 and the year ended December 31, 2020, respectively. There were $109 thousand of loss reimbursement and settlement claims paid for the three months ended March 31, 2021 and there were no such claims for the year ended December 31, 2020. Make whole requests during 2020 and the first three months of 2021 generally arose from loans sold during the period of January 1, 2012 to December 31, 2020. Since January 1, 2012, loans sold totaled $14.7 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2021, approximately $6.5 billion of these sold loans remain outstanding. The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The mortgage repurchase reserve, included in accrued expenses and other liabilities on the consolidated balance sheets, was $1 million as of March 31, 2021 and $2 million as of December 31, 2020. The Corporation may also sell residential mortgage loans with limited recourse (limited in that the recourse period ends prior to the loan’s maturity, usually after certain time and / or loan paydown criteria have been met), whereby repurchase could be required if the loan had defined delinquency issues during the limited recourse periods. At March 31, 2021 and December 31, 2020, there were approximately $27 million and $36 million, respectively, of residential mortgage loans sold with such recourse risk. There have been limited instances and immaterial historical losses on repurchases for recourse under the limited recourse criteria. The Corporation has a subordinate position to the FHLB in the credit risk on residential mortgage loans it sold to the FHLB in exchange for a monthly credit enhancement fee. The Corporation has not sold loans to the FHLB with such credit risk retention since February 2005. At March 31, 2021 and December 31, 2020, there were $31 million and $33 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value represents the estimated price at which an orderly transaction to sell an asset or to transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept). The valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis are described in the Fair Value Measurements note in the Corporation’s 2020 Annual Report on Form 10-K. The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy March 31, 2021 December 31, 2020 Assets Investment securities AFS U.S. Treasury securities Level 1 $ 53,693 $ 26,531 Agency securities Level 2 14,904 25,038 Obligations of state and political subdivisions (municipal securities) Level 2 433,182 450,662 Residential mortgage-related securities FNMA / FHLMC Level 2 1,910,954 1,461,241 GNMA Level 2 123,365 235,537 Commercial mortgage-related securities FNMA / FHLMC Level 2 94,349 22,904 GNMA Level 2 389,411 524,756 Asset backed securities FFELP Level 2 325,933 327,189 SBA Level 2 8,160 8,584 Other debt securities Level 2 3,000 3,000 Total investment securities AFS Level 1 $ 53,693 $ 26,531 Total investment securities AFS Level 2 3,303,257 3,058,910 Equity securities with readily determinable fair values Level 1 1,684 1,661 Residential loans held for sale Level 2 153,151 129,158 Interest rate-related instruments (a) Level 2 121,020 192,518 Foreign currency exchange forwards (a) Level 2 3,044 4,909 Commodity contracts (a) Level 2 5,808 12,486 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 6,917 9,624 Forward commitments to sell residential mortgage loans Level 3 4,255 — Liabilities Interest rate-related instruments (a) Level 2 $ 28,382 $ 25,680 Foreign currency exchange forwards (a) Level 2 2,828 4,836 Commodity contracts (a) Level 2 5,098 11,155 Forward commitments to sell residential mortgage loans Level 3 — 2,046 (a) Figures are presented gross before netting. See Note 10 and Note 11 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the 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 three months ended March 31, 2021 and the year ended December 31, 2020, for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ in Thousands) Interest rate lock commitments to originate residential mortgage loans held for sale Forward commitments to sell residential mortgage loans Total Balance December 31, 2019 $ 2,527 $ 710 $ 1,817 New production 72,659 (3,505) 76,164 Closed loans / settlements (76,001) (12,587) (63,414) Other 10,439 17,427 (6,988) Mortgage derivative gain (loss) 7,097 1,335 5,762 Balance December 31, 2020 $ 9,624 $ 2,046 $ 7,579 New production $ 16,629 $ (1,203) $ 17,832 Closed loans / settlements (14,186) 2,501 (16,687) Other (5,151) (7,598) 2,447 Mortgage derivative gain (loss) (2,708) (6,300) 3,593 Balance March 31, 2021 $ 6,917 $ (4,255) $ 11,171 The closing ratio on interest rate lock commitments to originate residential mortgage loans held for sale is a Level 3 measurement, and was 89% at March 31, 2021. The following table presents the carrying value of equity securities without readily determinable fair values still held as of March 31, 2021 that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of March 31, 2021: ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2020 $ 13,444 Carrying value changes — Additions 544 Carrying value as of March 31, 2021 $ 13,989 Cumulative upward carrying value changes between January 1, 2018 and March 31, 2021 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and March 31, 2021 $ — The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall: Consolidated Statements of Income Adjustment Recognized on the Consolidated Statements of Income (c) ($ in Thousands) Fair Value Hierarchy Fair Value March 31, 2021 Assets Individually evaluated loans (a) Level 3 $ 93,201 Provision for credit losses $ (1,613) OREO (b) Level 2 10,326 Other noninterest expense 3,681 Mortgage servicing rights Level 3 49,541 Mortgage banking, net 10,578 December 31, 2020 Assets Individually evaluated loans (a) Level 3 $ 138,752 Provision for credit losses $ 97,519 OREO (b) Level 2 6,125 Other noninterest expense 3,747 Mortgage servicing rights Level 3 41,990 Mortgage banking, net (17,704) (a) Includes probable TDRs which are individually analyzed, net of the related allowance for credit losses. (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) Includes the full year impact on the consolidated statements of income 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: March 31, 2021 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 10% - 45% 16% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 25% - 38% 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: March 31, 2021 December 31, 2020 ($ in Thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 356,285 $ 356,285 $ 416,154 $ 416,154 Interest-bearing deposits in other financial institutions Level 1 1,590,494 1,590,494 298,759 298,759 Federal funds sold and securities purchased under agreements to resell Level 1 — — 1,135 1,135 Investment securities AFS Level 1 53,693 53,693 26,531 26,531 Investment securities AFS Level 2 3,303,257 3,303,257 3,058,910 3,058,910 Investment securities HTM, net Level 1 1,000 1,019 999 1,024 Investment securities HTM, net Level 2 1,856,088 1,971,459 1,877,939 2,027,852 Equity securities with readily determinable fair values Level 1 1,684 1,684 1,661 1,661 Equity securities without readily determinable fair values Level 3 13,989 13,989 13,444 13,444 FHLB and Federal Reserve Bank stocks Level 2 168,281 168,281 168,280 168,280 Residential loans held for sale Level 2 153,151 153,151 129,158 129,158 Loans, net Level 3 23,809,389 23,723,543 24,068,022 24,012,738 Bank and corporate owned life insurance Level 2 680,831 680,831 679,647 679,647 Derivatives (other assets) (a) Level 2 129,872 129,872 209,913 209,913 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 6,917 6,917 9,624 9,624 Forward commitments to sell residential mortgage loans (other assets) Level 3 4,255 4,255 — — Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 26,115,814 $ 26,115,814 $ 24,725,451 $ 24,725,451 Brokered CDs and other time deposits (b) Level 2 1,561,352 1,566,421 1,757,030 1,766,200 Short-term funding Level 2 189,678 189,672 252,317 252,303 FHLB advances Level 2 1,629,966 1,693,172 1,632,723 1,760,727 Other long-term funding Level 2 549,729 576,183 549,465 578,233 Standby letters of credit (c) Level 2 2,549 2,549 2,731 2,731 Derivatives (accrued expenses and other liabilities) (a) Level 2 36,308 36,308 41,671 41,671 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 — — 2,046 2,046 (a) Figures are presented gross before netting. See Note 10 and Note 11 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the 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 commitment on standby letters of credit was $247 million at March 31, 2021 and $279 million at December 31, 2020. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Corporation has a noncontributory defined benefit retirement account plan, the RAP, covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes. The Corporation also provides legacy healthcare access to a limited group of retired employees from a previous acquisition in the Postretirement Plan. There are no other active retiree healthcare plans. The First Staunton acquisition closed on February 14, 2020, and the employees who met the required criteria as a result of the transaction became eligible to participate in the RAP on February 15, 2020, with their vesting service credit based on their prior hours of service with First Staunton. See Note 2 for additional information on the First Staunton acquisition. The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, ($ in Thousands) 2021 2020 Components of Net Periodic Benefit Cost RAP Service cost $ 2,075 $ 2,165 Interest cost 1,623 2,008 Expected return on plan assets (6,430) (6,405) Amortization of prior service cost (18) (19) Amortization of actuarial loss (gain) 1,050 808 Total net periodic pension cost $ (1,701) $ (1,444) Postretirement Plan Interest cost $ 13 $ 20 Amortization of prior service cost (19) (19) Total net periodic benefit cost $ (6) $ 1 The components of net periodic pension cost and net periodic benefit cost, other than the service cost component, are included in the line item other of noninterest expense on the consolidated statements of income. The service cost components are included in personnel on the consolidated statements of income. The weighted-average interest crediting rate was 2.80% at both March 31, 2021 and December 31, 2020. The Corporation’s funding policy is to pay at least the minimum amount required by federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its RAP. There were no contributions during the three months ended March 31, 2021 and 2020.

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Corporation utilizes a risk-based internal profitability measurement system to provide strategic business unit reporting. The profitability measurement system is based on internal management methodologies designed to produce consistent results and reflect the underlying economics of the units. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer, and the distribution of those products and services are similar. The three reportable segments are Corporate and Commercial Specialty; Community, Consumer, and Business; and Risk Management and Shared Services. The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation’s 2020 Annual Report on Form 10-K with certain exceptions. The more significant of these exceptions are described herein. The reportable segment results are presented based on the Corporation's internal management accounting process. The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to U.S. GAAP. As a result, reported segments and the financial information of the reported segments are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in previously reported segment financial data. Additionally, the information presented is not indicative of how the segments would perform if they operated as independent entities. To determine financial performance of each segment, the Corporation allocates FTP assignments, the provision for credit losses, certain noninterest expenses, income taxes, and equity to each segment. Allocation methodologies are subject to periodic adjustment as the internal management accounting system is revised, the interest rate environment evolves, and business or product lines within the segments change. Also, because the development and application of these methodologies is a dynamic process, the financial results presented may be periodically reviewed. The Corporation allocates net interest income using an internal FTP methodology that charges users of funds (assets) and credits providers of funds (liabilities, primarily deposits) based on the maturity, prepayment and / or re-pricing characteristics of the assets and liabilities. The net effect of this allocation is offset in the Risk Management and Shared Services segment to ensure consolidated totals reflect the Corporation's net interest income. The net FTP allocation is reflected as net intersegment 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 the methodologies described in the Corporation’s 2020 Annual Report on Form 10-K. The net effect of the credit provision is recorded in Risk Management and Shared Services. Indirect expenses incurred by certain centralized support areas are allocated to segments based on actual usage (for example, volume measurements) and other criteria. Certain types of administrative expense and bank-wide expense accruals (including amortization of CDIs and other intangible assets associated with acquisitions, acquisition-related costs, and asset gains on disposed business units) are generally not allocated to segments. Income taxes are allocated to segments based on the Corporation’s estimated effective tax rate, with certain segments adjusted for any tax-exempt income or non-deductible expenses. Equity is allocated to the segments based on regulatory capital requirements and in proportion to an assessment of the inherent risks associated with the business of the segment (including interest, credit and operating risk). A brief description of each business segment is presented below. A more in-depth discussion of these segments can be found in the Segment Reporting footnote in the Corporation’s 2020 Annual Report on Form 10-K. The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, not-for-profits, municipalities, and financial institutions by providing lending and deposit solutions as well as the support to deliver, fund, and manage such banking solutions. In addition, this segment provides a variety of investment, fiduciary, and retirement planning products and services to individuals and small to mid-sized businesses. During the first quarter of 2021, the Corporation sold its wealth management subsidiary Whitnell. The Communi ty, 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. The Risk Management and Shared Services segment includes key shared operational functions and also includes residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (FTP mismatches) and credit risk and provision residuals (long-term credit charge mismatches). Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 93,161 $ 107,753 Net intersegment interest income (expense) 6,684 (10,726) Segment net interest income 99,845 97,028 Noninterest income (a) 43,031 38,733 Total revenue 142,876 135,761 Provision for credit losses 17,509 12,172 Noninterest expense 57,725 54,304 Income (loss) before income taxes 67,642 69,284 Income tax expense (benefit) 12,649 12,940 Net income $ 54,993 $ 56,344 Allocated goodwill $ 525,836 $ 530,144 Community, Consumer, and Business Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 68,275 $ 74,927 Net intersegment interest income (expense) 12,875 18,665 Segment net interest income 81,150 93,592 Noninterest income 46,128 53,350 Total revenue 127,278 146,942 Provision for credit losses 5,099 5,108 Noninterest expense 97,346 113,777 Income (loss) before income taxes 24,834 28,057 Income tax expense (benefit) 5,215 5,892 Net income $ 19,618 $ 22,165 Allocated goodwill $ 579,156 $ 661,244 Risk Management and Shared Services Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 14,465 $ 20,261 Net intersegment interest income (expense) (19,559) (7,939) Segment net interest income (5,094) 12,322 Noninterest income 6,184 6,223 Total revenue 1,091 18,545 Provision for credit losses (45,612) 35,720 Noninterest expense 20,275 24,110 Income (loss) before income taxes 26,427 (41,285) Income tax expense (benefit) 6,737 (8,613) Net income $ 19,690 $ (32,672) Allocated goodwill $ — $ — Consolidated Total Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 175,902 $ 202,942 Net intersegment interest income (expense) — — Segment net interest income 175,902 202,942 Noninterest income (a) 95,343 98,306 Total revenue 271,245 301,248 Provision for credit losses (23,004) 53,001 Noninterest expense 175,347 192,191 Income (loss) before income taxes 118,903 56,056 Income tax expense (benefit) 24,602 10,219 Net income $ 94,301 $ 45,838 Allocated goodwill $ 1,104,992 $ 1,191,388

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following tables summarize the components of accumulated other comprehensive income (loss) at March 31, 2021 and 2020, including changes during the preceding three month periods as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Defined Benefit Accumulated Balance December 31, 2020 $ 41,325 $ (28,707) $ 12,618 Other comprehensive income (loss) before reclassifications (23,979) — (23,979) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net 39 — 39 Personnel expense — (37) (37) Other expense — 1,050 1,050 Interest income 518 — 518 Income tax (expense) benefit 5,851 (253) 5,598 Net other comprehensive income (loss) during period (17,571) 760 (16,811) Balance March 31, 2021 $ 23,754 $ (27,947) $ (4,193) Balance December 31, 2019 $ 3,989 $ (37,172) $ (33,183) Other comprehensive income (loss) before reclassifications 26,419 — 26,419 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (6,118) — (6,118) Personnel expense — (38) (38) Other expense — 808 808 Interest income 556 — 556 Income tax (expense) benefit (5,225) (193) (5,418) Net other comprehensive income (loss) during period 15,632 577 16,209 Balance March 31, 2020 $ 19,620 $ (36,595) $ (16,974)

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2021
Revenue Recognition [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Revenue from contracts with customers is recognized when obligations under the terms of a contract with the Corporation's customer are satisfied. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. We do not have any material significant payment terms as payment is received at or shortly after the satisfaction of the performance obligation. The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty Three Months Ended March 31, ($ in Thousands) 2021 2020 Wealth management fees $ 22,414 $ 20,106 Service charges and deposit account fees 4,905 3,551 Card-based fees (a) 435 515 Insurance commissions and fees 24 76 Other revenue 685 788 Noninterest income (in-scope of Topic 606) $ 28,463 $ 25,036 Noninterest income (out-of-scope of Topic 606) 14,568 13,697 Total noninterest income $ 43,031 $ 38,733 Community, Consumer, and Business Three Months Ended March 31, ($ in Thousands) 2021 2020 Wealth management fees $ — $ 710 Service charges and deposit account fees 9,935 11,665 Card-based fees (a) 9,325 9,045 Insurance commissions and fees 50 22,529 Other revenue 3,579 2,286 Noninterest income (in-scope of Topic 606) $ 22,889 $ 46,235 Noninterest income (out-of-scope of Topic 606) 23,239 7,115 Total noninterest income $ 46,128 $ 53,350 Risk Management and Shared Services Three Months Ended March 31, ($ in Thousands) 2021 2020 Service charges and deposit account fees 15 5 Card-based fees (a) 4 47 Insurance commissions and fees 2 3 Other revenue 389 23 Noninterest income (in-scope of Topic 606) $ 409 $ 77 Noninterest income (out-of-scope of Topic 606) 5,775 6,146 Total noninterest income $ 6,184 $ 6,223 Consolidated Total Three Months Ended March 31, ($ in Thousands) 2021 2020 Wealth management fees $ 22,414 $ 20,816 Service charges and deposit account fees 14,855 15,222 Card-based fees (a) 9,764 9,607 Insurance commissions and fees 76 22,608 Other revenue 4,653 3,096 Noninterest income (in-scope of Topic 606) $ 51,762 $ 71,348 Noninterest income (out-of-scope of Topic 606) 43,581 26,958 Total noninterest income $ 95,343 $ 98,306 (a) Certain card-based fees are out-of-scope of Topic 606. Below is a listing of performance obligations for the Corporation's main revenue streams: Revenue Stream Noninterest income in-scope of Topic 606 Service charges and deposit account fees Service charges and deposit account fees consist of monthly service fees (i.e. business analyzed fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges and deposit account fees is primarily received immediately or in the following month through a direct charge to customers’ accounts. Card-based fees (a) Card-based fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month. Trust and asset management fees (b) Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to the customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and advisory fees (b) Brokerage and advisory fees primarily consist of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage and advisory fees are included in wealth management fees.

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	Leases The Corporation has operating leases for retail and corporate offices, land, and equipment. The Corporation also has finance leases for land. These leases have original terms of 1 year or longer with remaining maturities up to 42 years, some of which include options to extend the lease term. An analysis of the lease options has been completed and any purchase options or optional periods that the Corporation is reasonably likely to extend have been included in the capitalization. The discount rate used to capitalize the operating leases is the Corporation's FHLB borrowing rate on the date of lease commencement. When determining the rate to discount specific lease obligations, the repayment period and term are considered. Operating and finance lease costs and cash flows resulting from these leases are presented below: Three Months Ended March 31, ($ in Thousands) 2021 2020 Operating lease costs $ 2,240 $ 2,623 Finance lease costs 39 36 Operating lease cash flows 2,963 2,731 Finance lease cash flows 40 21 The lease classifications on the consolidated balance sheets were as follows: ($ in Thousands) Consolidated Balance Sheets Category March 31, 2021 December 31, 2020 Amount Operating lease right-of-use asset Premises and equipment $ 32,071 $ 31,994 Finance lease right-of-use asset Other assets 854 962 Operating lease liability Accrued expenses and other liabilities 36,079 36,425 Finance lease liability Other long-term funding 1,091 1,128 The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: March 31, 2021 December 31, 2020 ($ in Thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment $ 385 2.24 0.46 % $ 386 2.49 0.46 % Retail and corporate offices 33,707 5.94 3.27 % 34,036 6.04 3.33 % Land 6,165 8.83 3.10 % 6,385 8.99 3.09 % Total operating leases $ 40,257 6.33 3.22 % $ 40,806 6.45 3.27 % Finance leases Land $ 1,105 1.40 1.05 % $ 1,145 1.65 1.05 % Total finance leases $ 1,105 1.40 1.05 % $ 1,145 1.65 1.05 % Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Nine Months Ending December 31, 2021 $ 6,591 $ 132 $ 6,724 2022 7,111 973 8,084 2023 6,010 — 6,010 2024 5,274 — 5,274 2025 4,110 — 4,110 Beyond 2025 11,160 — 11,160 Total lease payments $ 40,257 $ 1,105 $ 41,362 Less: interest 4,178 14 4,192 Present value of lease payments $ 36,079 $ 1,091 $ 37,170

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Description Date of adoption Effect on financial statements ASU 2019-12 The FASB issued this amendment to simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740. The amendment also improves consistent application of and simplifies GAAP for other areas of Topic 740 by clarifying and amending existing guidance. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendment was permitted. 1st Quarter 2021 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity. ASU 2020-08 Codification Improvements to Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs The FASB issued this amendment to clarify that an entity should reevaluate whether a callable debt security is within the scope of paragraph 310-20-35-33 for each reporting period. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of the amendments was not permitted. 1st Quarter 2021 Adoption of this amendment did not have a material impact on the Corporation's results of operation, financial position or liquidity. Future Accounting Pronouncements

Acquisitions Acquisitions (Tabl

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

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Calculations for basic and diluted earnings per common share	Presented below are the calculations for basic and diluted earnings per common share: Three Months Ended March 31, (In Thousands, except per share data) 2021 2020 Net income $ 94,301 $ 45,838 Preferred stock dividends (5,207) (3,801) Net income available to common equity $ 89,094 $ 42,037 Common shareholder dividends (27,661) (28,264) Unvested share-based payment awards (209) (128) Undistributed earnings $ 61,224 $ 13,645 Undistributed earnings allocated to common shareholders $ 60,836 $ 13,555 Undistributed earnings allocated to unvested share-based payment awards 387 90 Undistributed earnings $ 61,224 $ 13,645 Basic Distributed earnings to common shareholders $ 27,661 $ 28,264 Undistributed earnings allocated to common shareholders 60,836 13,555 Total common shareholders earnings, basic $ 88,497 $ 41,819 Diluted Distributed earnings to common shareholders $ 27,661 $ 28,264 Undistributed earnings allocated to common shareholders 60,836 13,555 Total common shareholders earnings, diluted $ 88,497 $ 41,819 Weighted average common shares outstanding 152,355 154,701 Effect of dilutive common stock awards 1,333 918 Diluted weighted average common shares outstanding 153,688 155,619 Basic earnings per common share $ 0.58 $ 0.27 Diluted earnings per common share $ 0.58 $ 0.27

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Fair value assumptions of stock options	The following assumptions were used in estimating the fair value for options granted for the full year 2020: 2020 Dividend yield 3.50 % Risk-free interest rate 1.60 % Weighted average expected volatility 21.00 % Weighted average expected life 5.75 years Weighted average per share fair value of options $2.39
Summary of company's stock option activities	A summary of the Corporation’s stock option activity for the three months ended March 31, 2021 is presented below: Stock Options Shares (a) Weighted Average Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (a) Outstanding at December 31, 2020 6,473 $ 19.77 6.23 years $ 2,005 Exercised 615 15.96 Forfeited or expired 35 20.99 Outstanding at March 31, 2021 5,823 $ 20.17 6.21 years $ 13,099 Options Exercisable at March 31, 2021 4,240 $ 20.19 5.39 years $ 10,154 (a) In thousands
Summary of restricted stock awards activity (excluding salary shares)	The following table summarizes information about the Corporation’s restricted stock awards activity for the three months ended March 31, 2021: Restricted Stock Awards Shares (a) Weighted Average Outstanding at December 31, 2020 2,293 $ 20.70 Granted 771 19.59 Vested 571 21.69 Forfeited 28 24.13 Outstanding at March 31, 2021 2,466 $ 19.72 (a) In thousands

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investment securities available for sale	The amortized cost and fair values of securities AFS and HTM at March 31, 2021 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 54,237 $ — $ (544) $ 53,693 Agency securities 15,000 — (96) 14,904 Obligations of state and political subdivisions (municipal securities) 411,964 21,218 — 433,182 Residential mortgage-related securities FNMA / FHLMC 1,910,644 5,956 (5,647) 1,910,954 GNMA 119,913 3,451 — 123,365 Commercial mortgage-related securities FNMA / FHLMC 93,902 2,330 (1,883) 94,349 GNMA 381,158 8,254 — 389,411 Asset backed securities FFELP 325,812 1,675 (1,554) 325,933 SBA 8,216 — (57) 8,160 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,323,846 $ 42,885 $ (9,782) $ 3,356,949 Investment securities HTM U. S. Treasury securities $ 1,000 $ 20 $ — $ 1,019 Obligations of state and political subdivisions (municipal securities) 1,455,462 106,933 (994) 1,561,401 Residential mortgage-related securities FNMA / FHLMC 47,480 2,471 — 49,951 GNMA 87,717 3,353 — 91,070 Commercial mortgage-related securities FNMA/FHLMC 63,844 157 (2,138) 61,863 GNMA 201,648 5,611 (21) 207,238 Total investment securities HTM $ 1,857,150 $ 118,544 $ (3,154) $ 1,972,541 The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U. S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943
Investment securities held to maturity	The amortized cost and fair values of securities AFS and HTM at March 31, 2021 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 54,237 $ — $ (544) $ 53,693 Agency securities 15,000 — (96) 14,904 Obligations of state and political subdivisions (municipal securities) 411,964 21,218 — 433,182 Residential mortgage-related securities FNMA / FHLMC 1,910,644 5,956 (5,647) 1,910,954 GNMA 119,913 3,451 — 123,365 Commercial mortgage-related securities FNMA / FHLMC 93,902 2,330 (1,883) 94,349 GNMA 381,158 8,254 — 389,411 Asset backed securities FFELP 325,812 1,675 (1,554) 325,933 SBA 8,216 — (57) 8,160 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,323,846 $ 42,885 $ (9,782) $ 3,356,949 Investment securities HTM U. S. Treasury securities $ 1,000 $ 20 $ — $ 1,019 Obligations of state and political subdivisions (municipal securities) 1,455,462 106,933 (994) 1,561,401 Residential mortgage-related securities FNMA / FHLMC 47,480 2,471 — 49,951 GNMA 87,717 3,353 — 91,070 Commercial mortgage-related securities FNMA/FHLMC 63,844 157 (2,138) 61,863 GNMA 201,648 5,611 (21) 207,238 Total investment securities HTM $ 1,857,150 $ 118,544 $ (3,154) $ 1,972,541 The amortized cost and fair values of securities AFS and HTM at December 31, 2020 were as follows: ($ in Thousands) Amortized Gross Gross Fair Value Investment securities AFS U. S. Treasury securities $ 26,436 $ 95 $ — $ 26,531 Agency securities 24,985 53 — 25,038 Obligations of state and political subdivisions (municipal securities) 425,057 25,605 — 450,662 Residential mortgage-related securities FNMA / FHLMC 1,448,806 12,935 (500) 1,461,241 GNMA 231,364 4,176 (3) 235,537 Commercial mortgage-related securities FNMA / FHLMC 19,654 3,250 — 22,904 GNMA 511,429 13,327 — 524,756 Asset backed securities FFELP 329,030 1,172 (3,013) 327,189 SBA 8,637 — (53) 8,584 Other debt securities 3,000 — — 3,000 Total investment securities AFS $ 3,028,399 $ 60,612 $ (3,570) $ 3,085,441 Investment securities HTM U. S. Treasury securities $ 999 $ 25 $ — $ 1,024 Obligations of state and political subdivisions (municipal securities) 1,441,900 133,544 — 1,575,445 Residential mortgage-related securities FNMA / FHLMC 54,599 2,891 — 57,490 GNMA 114,553 4,260 — 118,813 Commercial mortgage-related securities FNMA / FHLMC 11,211 — — 11,211 GNMA 255,742 9,218 — 264,960 Total investment securities HTM $ 1,879,005 $ 149,938 $ — $ 2,028,943
Amortized cost and fair values of investment securities by contractual maturity	The expected maturities of investment securities AFS and HTM at March 31, 2021, are shown below: AFS HTM ($ in Thousands) Amortized Fair Amortized Fair Due in one year or less $ 9,575 $ 9,588 $ 35,299 $ 35,587 Due after one year through five years 79,504 79,813 47,810 49,383 Due after five years through ten years 357,498 373,906 179,382 188,263 Due after ten years 37,624 41,472 1,193,970 1,289,186 Total debt securities 484,201 504,778 1,456,461 1,562,420 Residential mortgage-related securities FNMA / FHLMC 1,910,644 1,910,954 47,480 49,951 GNMA 119,913 123,365 87,717 91,070 Commercial mortgage-related securities FNMA / FHLMC 93,902 94,349 63,844 61,863 GNMA 381,158 389,411 201,648 207,238 Asset backed securities FFELP 325,812 325,933 — — SBA 8,216 8,160 — — Total investment securities $ 3,323,846 $ 3,356,949 $ 1,857,150 $ 1,972,541 Ratio of fair value to amortized cost 101.0 % 106.2 %
Debt Securities, Held-to-maturity, Credit Quality Indicator	The following table summarizes the credit quality indicators of HTM securities at amortized cost at March 31, 2021: ($ in Thousands) AAA AA A Not Rated Total U. S. Treasury securities $ 1,000 $ — $ — $ — $ 1,000 Obligations of state and political subdivisions (municipal securities) 582,675 860,882 11,711 193 1,455,462 Residential mortgage-related securities FNMA / FHLMC 47,480 — — — 47,480 GNMA 87,717 — — — 87,717 Commercial mortgage-related securities FNMA / FHLMC 63,844 — — — 63,844 GNMA 201,648 — — — 201,648 Total HTM securities $ 984,363 $ 860,882 $ 11,711 $ 193 $ 1,857,150
Realized gains and losses and proceeds from sale	The proceeds from the sale of investment securities for the three months ended March 31, 2021 and 2020, are shown below: Three Months Ended March 31, ($ in Thousands) 2021 2020 Gross gains on AFS securities $ 36 $ 6,198 Gross (losses) on AFS securities (75) (80) Investment securities gains (losses), net $ (39) $ 6,118 Proceeds from sales of investment securities $ 51,295 $ 365,239
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 March 31, 2021: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS U.S. Treasury securities 5 $ (544) $ 53,693 — $ — $ — $ (544) $ 53,693 Agency securities 1 (96) 14,904 — — — (96) 14,904 Obligations of state and political subdivisions (municipal securities) 1 — 910 — — — — 910 Residential mortgage-related securities FNMA / FHLMC 24 (5,647) 756,359 — — — (5,647) 756,359 GNMA 1 — 253 — — — — 253 Commercial mortgage-related securities FNMA / FHLMC 2 (1,883) 72,435 — — — (1,883) 72,435 GNMA 1 — 78 — — — — 78 Asset backed securities FFELP — — — 15 (1,554) 141,652 (1,554) 141,652 SBA — — — 14 (57) 7,750 (57) 7,750 Total 35 $ (8,171) $ 898,632 29 $ (1,611) $ 149,402 $ (9,782) $ 1,048,033 Investment securities HTM Obligations of state and political subdivisions (municipal securities) 33 $ (994) $ 62,908 — $ — $ — $ (994) $ 62,908 Commercial mortgage-related securities FNMA / FHLMC 6 (2,138) 41,105 — — — (2,138) 41,105 GNMA 2 (21) 22,205 — — — (21) 22,205 Total 41 $ (3,154) $ 126,218 — $ — $ — $ (3,154) $ 126,218 For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities AFS and HTM, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020: Less than 12 months 12 months or more Total ($ in Thousands) Number Unrealized Fair Number Unrealized Fair Unrealized Fair Investment securities AFS Residential mortgage-related securities FNMA / FHLMC 7 $ (500) $ 163,002 — $ — $ — $ (500) $ 163,002 GNMA 2 (3) 9,784 — — — (3) 9,784 GNMA commercial mortgage-related securities 1 — 287 — — — — 287 Asset backed securities FFELP 1 (129) 9,267 16 (2,885) 178,681 (3,013) 187,948 SBA 14 (53) 8,379 — — — (53) 8,379 Other debt securities 2 — 2,000 — — — — 2,000 Total 27 $ (685) $ 192,720 16 $ (2,885) $ 178,681 $ (3,570) $ 371,400 Investment securities HTM GNMA residential mortgage-related securities 1 $ — $ 325 — $ — $ — $ — $ 325 Total 1 $ — $ 325 — $ — $ — $ — $ 325

Loans Loans (Tables)

Loans Loans (Tables)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Loan composition	The period end loan composition was as follows: ($ in Thousands) March 31, 2021 December 31, 2020 PPP $ 836,566 $ 767,757 Commercial and industrial 7,664,501 7,701,422 Commercial real estate — owner occupied 883,237 900,912 Commercial and business lending 9,384,303 9,370,091 Commercial real estate — investor 4,260,706 4,342,584 Real estate construction 1,882,299 1,840,417 Commercial real estate lending 6,143,004 6,183,001 Total commercial 15,527,307 15,553,091 Residential mortgage 7,685,218 7,878,324 Home equity 651,647 707,255 Other consumer 298,156 313,054 Total consumer 8,635,020 8,898,632 Total loans $ 24,162,328 $ 24,451,724
Commercial and consumer loans by credit quality indicator	he following table presents commercial and consumer loans by credit quality indicator by vintage year at March 31, 2021: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 281,120 $ 527,971 $ — $ — $ — $ — $ 809,091 Special Mention — — 1,642 3,434 — — — — 5,076 Potential Problem — — 9,450 12,948 — — — — 22,398 PPP $ — $ — $ 292,213 $ 544,353 $ — $ — $ — $ — $ 836,566 Commercial and industrial: Risk rating: Pass $ 2,009 $ 2,170,406 $ 378,782 $ 1,303,573 $ 1,333,680 $ 1,119,175 $ 389,390 $ 694,910 $ 7,389,917 Special Mention — 7,298 96 3,805 59,502 48,156 207 185 119,249 Potential Problem 1,800 20,492 4,166 17,407 34,437 37,587 1,761 6,294 122,143 Nonaccrual — — — 6,143 725 16,530 334 9,461 33,192 Commercial and industrial $ 3,809 $ 2,198,196 $ 383,045 $ 1,330,929 $ 1,428,343 $ 1,221,448 $ 391,692 $ 710,849 $ 7,664,501 Commercial real estate - owner occupied: Risk rating: Pass $ 11,868 $ 20,916 $ 59,551 $ 174,514 $ 210,032 $ 128,471 $ 81,020 $ 184,983 $ 859,487 Special Mention — — — 5,014 2,080 — 424 260 7,777 Potential Problem — 622 105 3,992 1,066 652 2,035 7,493 15,965 Nonaccrual — — — — — — — 7 7 Commercial real estate - owner occupied $ 11,868 $ 21,538 $ 59,656 $ 183,520 $ 213,178 $ 129,123 $ 83,479 $ 192,743 $ 883,237 Commercial and business lending: Risk rating: Pass $ 13,877 $ 2,191,322 $ 719,454 $ 2,006,059 $ 1,543,712 $ 1,247,646 $ 470,410 $ 879,893 $ 9,058,495 Special Mention — 7,298 1,738 12,253 61,582 48,156 631 444 132,102 Potential Problem 1,800 21,114 13,721 34,347 35,502 38,238 3,796 13,786 160,506 Nonaccrual — — — 6,143 725 16,530 334 9,468 33,200 Commercial and business lending $ 15,677 $ 2,219,734 $ 734,913 $ 2,058,802 $ 1,641,521 $ 1,350,571 $ 475,170 $ 903,592 $ 9,384,303 Commercial real estate - investor: Risk rating: Pass $ — $ 153,847 $ 344,412 $ 1,106,623 $ 989,271 $ 635,944 $ 208,367 $ 445,269 $ 3,883,733 Special Mention — — 1,776 83,975 104,806 16,161 8,897 17,121 232,735 Potential Problem — 802 5,473 52,576 8,952 1,787 2,840 13,321 85,752 Nonaccrual — — — 8,883 15,605 19,522 14,173 302 58,485 Commercial real estate - investor $ — $ 154,649 $ 351,662 $ 1,252,057 $ 1,118,634 $ 673,414 $ 234,276 $ 476,014 $ 4,260,706 Real estate construction: Risk rating: Pass $ 5,732 $ 26,865 $ 125,807 $ 756,890 $ 628,967 $ 228,127 $ 21,478 $ 16,815 $ 1,804,950 Special Mention — — — 529 3,648 58,826 42 — 63,045 Potential Problem — — 12 131 13,713 — — 119 13,977 Nonaccrual — — — — — — — 327 327 Real estate construction $ 5,732 $ 26,865 $ 125,819 $ 757,550 $ 646,328 $ 286,953 $ 21,520 $ 17,262 $ 1,882,299 Commercial real estate lending: Risk rating: Pass $ 5,732 $ 180,712 $ 470,219 $ 1,863,513 $ 1,618,239 $ 864,072 $ 229,845 $ 462,084 $ 5,688,683 Special Mention — — 1,776 84,504 108,453 74,987 8,939 17,121 295,780 Potential Problem — 802 5,486 52,708 22,665 1,787 2,840 13,440 99,728 Nonaccrual — — — 8,883 15,605 19,522 14,173 630 58,813 Commercial real estate lending $ 5,732 $ 181,515 $ 477,481 $ 2,009,607 $ 1,764,962 $ 960,368 $ 255,796 $ 493,275 $ 6,143,004 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis YTD 2021 2020 2019 2018 2017 Prior Total Total commercial: Risk rating: Pass $ 19,609 $ 2,372,034 $ 1,189,673 $ 3,869,571 $ 3,161,950 $ 2,111,718 $ 700,255 $ 1,341,977 $ 14,747,179 Special Mention — 7,298 3,514 96,757 170,035 123,143 9,569 17,565 427,882 Potential Problem 1,800 21,916 19,207 87,055 58,167 40,026 6,636 27,227 260,234 Nonaccrual — — — 15,026 16,330 36,052 14,507 10,098 92,012 Total commercial $ 21,409 $ 2,401,249 $ 1,212,394 $ 4,068,409 $ 3,406,483 $ 2,310,939 $ 730,967 $ 1,396,867 $ 15,527,307 Residential mortgage: Risk rating: Pass $ — $ — $ 449,381 $ 2,205,662 $ 1,280,604 $ 545,743 $ 881,884 $ 2,257,349 $ 7,620,622 Special Mention — — — 121 — 37 133 525 816 Potential Problem — — 72 510 561 674 126 582 2,524 Nonaccrual — — — 1,765 3,160 6,431 8,243 41,657 61,256 Residential mortgage $ — $ — $ 449,452 $ 2,208,058 $ 1,284,324 $ 552,885 $ 890,386 $ 2,300,113 $ 7,685,218 Home equity: Risk rating: Pass $ 1,891 $ 526,777 $ 71 $ 2,080 $ 11,595 $ 13,535 $ 10,333 $ 75,385 $ 639,776 Special Mention — 25 — — — 60 — 265 350 Potential Problem — 1,563 — — — 20 — 146 1,729 Nonaccrual 262 91 10 786 118 366 413 8,008 9,792 Home equity $ 2,153 $ 528,455 $ 81 $ 2,866 $ 11,713 $ 13,981 $ 10,745 $ 83,805 $ 651,647 Other consumer: Risk rating: Pass $ 171 $ 156,829 $ 1,908 $ 8,330 $ 8,674 $ 2,974 $ 1,351 $ 117,360 $ 297,427 Special Mention — 452 — — 40 — — 5 497 Nonaccrual 13 93 — 15 35 10 23 56 231 Other consumer $ 183 $ 157,375 $ 1,908 $ 8,345 $ 8,749 $ 2,984 $ 1,374 $ 117,421 $ 298,156 Total consumer: Risk rating: Pass $ 2,062 $ 683,606 $ 451,360 $ 2,216,072 $ 1,300,872 $ 562,252 $ 893,567 $ 2,450,094 $ 8,557,824 Special Mention — 477 — 121 40 96 133 795 1,663 Potential Problem — 1,563 72 510 561 694 126 728 4,254 Nonaccrual 274 184 10 2,566 3,313 6,807 8,678 49,722 71,280 Total consumer $ 2,336 $ 685,830 $ 451,442 $ 2,219,269 $ 1,304,787 $ 569,850 $ 902,504 $ 2,501,338 $ 8,635,020 Total loans: Risk rating: Pass $ 21,671 $ 3,055,640 $ 1,641,033 $ 6,085,644 $ 4,462,823 $ 2,673,970 $ 1,593,822 $ 3,792,071 $ 23,305,003 Special Mention — 7,775 3,514 96,877 170,076 123,240 9,703 18,360 429,545 Potential Problem 1,800 23,479 19,279 87,565 58,729 40,720 6,761 27,955 264,488 Nonaccrual 274 184 10 17,592 19,643 42,859 23,185 59,819 163,292 Total loans $ 23,745 $ 3,087,079 $ 1,663,836 $ 6,287,678 $ 4,711,270 $ 2,880,788 $ 1,633,471 $ 3,898,205 $ 24,162,328 (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. The following table presents commercial and consumer loans by credit quality indicator by vintage year at December 31, 2020: Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total PPP: (b) Risk rating: Pass $ — $ — $ 745,767 $ — $ — $ — $ — $ — $ 745,767 Special Mention — — 3,988 — — — — — 3,988 Potential Problem — — 18,002 — — — — — 18,002 PPP $ — $ — $ 767,757 $ — $ — $ — $ — $ — $ 767,757 Commercial and industrial: Risk rating: Pass $ 4,628 $ 2,177,138 $ 1,389,260 $ 1,435,519 $ 1,182,302 $ 483,957 $ 305,998 $ 453,734 $ 7,427,908 Special Mention — 10,159 2,719 39,854 37,042 113 215 67 90,169 Potential Problem 2,565 7,237 19,331 28,413 56,580 2,269 6,477 1,179 121,487 Nonaccrual 16,852 — 6,238 5,789 17,014 16,623 8,781 7,414 61,859 Commercial and industrial $ 24,045 $ 2,194,534 $ 1,417,548 $ 1,509,575 $ 1,292,938 $ 502,962 $ 321,471 $ 462,394 $ 7,701,422 Commercial real estate - owner occupied: Risk rating: Pass $ 1,150 $ 18,022 $ 185,861 $ 209,069 $ 128,360 $ 99,546 $ 147,366 $ 79,111 $ 867,335 Special Mention — 113 1,882 3,122 300 658 264 — 6,339 Potential Problem — 3,486 4,104 8,916 — 1,490 4,437 3,747 26,179 Nonaccrual — — — — — 318 — 740 1,058 Commercial real estate - owner occupied $ 1,150 $ 21,621 $ 191,847 $ 221,107 $ 128,660 $ 102,012 $ 152,067 $ 83,598 $ 900,912 Commercial and business lending: Risk rating: Pass $ 5,778 $ 2,195,160 $ 2,320,888 $ 1,644,588 $ 1,310,662 $ 583,503 $ 453,364 $ 532,845 $ 9,041,009 Special Mention — 10,272 8,589 42,976 37,342 771 479 67 100,496 Potential Problem 2,565 10,723 41,437 37,329 56,580 3,759 10,915 4,926 165,668 Nonaccrual 16,852 — 6,238 5,789 17,014 16,941 8,781 8,154 62,917 Commercial and business lending $ 25,195 $ 2,216,154 $ 2,377,152 $ 1,730,682 $ 1,421,598 $ 604,974 $ 473,539 $ 545,992 $ 9,370,091 Commercial real estate - investor: Risk rating: Pass $ 10,971 $ 171,497 $ 1,249,644 $ 976,332 $ 720,237 $ 271,987 $ 341,658 $ 211,360 $ 3,942,714 Special Mention — — 90,235 97,333 12,339 — 21,882 8,465 230,254 Potential Problem — 838 16,343 13,575 30,911 2,279 239 27,209 91,396 Nonaccrual 19,803 — 10,141 53,056 446 14,267 — 309 78,220 Commercial real estate - investor $ 30,774 $ 172,335 $ 1,366,364 $ 1,140,297 $ 763,933 $ 288,533 $ 363,779 $ 247,343 $ 4,342,584 Real estate construction: Risk rating: Pass $ 776 $ 47,880 $ 645,925 $ 738,561 $ 294,910 $ 25,219 $ 2,420 $ 16,768 $ 1,771,682 Special Mention — — 487 494 48,283 42 — 30 49,336 Potential Problem — — 135 — 18,803 — 93 15 19,046 Nonaccrual — — — — — 16 — 338 353 Real estate construction $ 776 $ 47,880 $ 646,547 $ 739,055 $ 361,996 $ 25,277 $ 2,513 $ 17,150 $ 1,840,417 Commercial real estate lending: Risk rating: Pass $ 11,746 $ 219,377 $ 1,895,569 $ 1,714,893 $ 1,015,146 $ 297,205 $ 344,078 $ 228,127 $ 5,714,396 Special Mention — — 90,722 97,827 60,622 42 21,882 8,494 279,590 Potential Problem — 838 16,479 13,575 49,714 2,279 332 27,224 110,442 Nonaccrual 19,803 — 10,141 53,056 446 14,283 — 647 78,573 Commercial real estate lending $ 31,549 $ 220,215 $ 2,012,911 $ 1,879,352 $ 1,125,929 $ 313,810 $ 366,292 $ 264,493 $ 6,183,001 Term Loans Amortized Cost Basis by Origination Year (a) ($ in Thousands) Rev Loans Converted to Term (a) Rev Loans Amortized Cost Basis 2020 2019 2018 2017 2016 Prior Total Total commercial: Risk rating: Pass $ 17,524 $ 2,414,537 $ 4,216,457 $ 3,359,482 $ 2,325,808 $ 880,708 $ 797,441 $ 760,973 $ 14,755,405 Special Mention — 10,272 99,311 140,803 97,964 813 22,361 8,562 380,086 Potential Problem 2,565 11,561 57,916 50,905 106,295 6,038 11,247 32,150 276,111 Nonaccrual 36,655 — 16,379 58,845 17,460 31,224 8,781 8,801 141,490 Total commercial $ 56,745 $ 2,436,370 $ 4,390,063 $ 3,610,033 $ 2,547,526 $ 918,783 $ 839,831 $ 810,485 $ 15,553,091 Residential mortgage: Risk rating: Pass $ — $ — $ 2,185,240 $ 1,490,589 $ 615,118 $ 998,072 $ 911,797 $ 1,612,971 $ 7,813,788 Special Mention — — — 355 330 102 126 537 1,450 Potential Problem — — 1,200 689 652 — 179 1,028 3,749 Nonaccrual — — 1,478 2,271 5,882 7,116 11,003 31,587 59,337 Residential mortgage $ — $ — $ 2,187,918 $ 1,493,903 $ 621,983 $ 1,005,290 $ 923,105 $ 1,646,124 $ 7,878,324 Home equity: Risk rating: Pass $ 10,224 $ 569,389 $ 2,057 $ 12,968 $ 15,792 $ 11,594 $ 5,803 $ 76,165 $ 693,767 Special Mention 596 631 — 39 14 39 4 804 1,532 Potential Problem — 1,922 — — — — — 146 2,068 Nonaccrual 1,600 100 965 134 410 319 711 7,249 9,888 Home equity $ 12,421 $ 572,041 $ 3,022 $ 13,141 $ 16,216 $ 11,952 $ 6,518 $ 84,364 $ 707,255 Other consumer: Risk rating: Pass $ 70 $ 165,114 $ 9,525 $ 10,309 $ 3,987 $ 1,872 $ 1,185 $ 120,425 $ 312,416 Special Mention 5 438 13 16 11 4 7 8 498 Nonaccrual 5 33 9 49 21 10 — 18 140 Other consumer $ 81 $ 165,585 $ 9,547 $ 10,374 $ 4,019 $ 1,886 $ 1,192 $ 120,451 $ 313,054 Total consumer: Risk rating: Pass $ 10,294 $ 734,502 $ 2,196,822 $ 1,513,865 $ 634,897 $ 1,011,539 $ 918,785 $ 1,809,561 $ 8,819,971 Special Mention 602 1,069 13 410 356 145 137 1,349 3,480 Potential Problem — 1,922 1,200 689 652 — 179 1,174 5,817 Nonaccrual 1,605 133 2,452 2,454 6,313 7,445 11,714 38,854 69,364 Total consumer $ 12,501 $ 737,626 $ 2,200,487 $ 1,517,417 $ 642,218 $ 1,019,128 $ 930,816 $ 1,850,939 $ 8,898,632 Total loans: Risk rating: Pass (c) $ 27,819 $ 3,149,039 $ 6,413,278 $ 4,873,347 $ 2,960,705 $ 1,892,247 $ 1,716,226 $ 2,570,534 $ 23,575,376 Special Mention 602 11,341 99,324 141,213 98,320 958 22,498 9,911 383,566 Potential Problem 2,565 13,483 59,116 51,593 106,947 6,038 11,426 33,324 281,928 Nonaccrual 38,260 133 18,831 61,298 23,773 38,669 20,496 47,655 210,854 Total loans $ 69,246 $ 3,173,996 $ 6,590,550 $ 5,127,451 $ 3,189,745 $ 1,937,912 $ 1,770,647 $ 2,661,424 $ 24,451,724 (b) The Corporation’s policy is to assign risk ratings at the borrower level. PPP loans are 100% guaranteed by the SBA and therefore the Corporation considers these loans to have a risk profile similar to pass rated loans. (c) Accruing TDRs are included in pass unless otherwise rated as special mention
Summarized details of Loans		The following table presents loans by past due status at March 31, 2021: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 836,566 $ — $ — $ — $ — $ 836,566 Commercial and industrial 7,630,593 444 82 190 33,192 7,664,501 Commercial real estate - owner occupied 883,229 — — — 7 883,237 Commercial and business lending 9,350,388 444 82 190 33,200 9,384,303 Commercial real estate - investor 4,196,221 5,999 — — 58,485 4,260,706 Real estate construction 1,880,995 977 — — 327 1,882,299 Commercial real estate lending 6,077,216 6,976 — — 58,813 6,143,004 Total commercial 15,427,603 7,420 82 190 92,012 15,527,307 Residential mortgage 7,619,602 3,494 479 387 61,256 7,685,218 Home equity 639,503 2,002 350 — 9,792 651,647 Other consumer 295,556 681 589 1,098 231 298,156 Total consumer 8,554,661 6,177 1,417 1,485 71,280 8,635,020 Total loans $ 23,982,264 $ 13,597 $ 1,500 $ 1,675 $ 163,292 $ 24,162,328 (a) Any loans deferred in connection with the COVID-19 pandemic are considered current in accordance with Section 4013 of the CARES Act. (b) Of the total nonaccrual loans, $99 million, or 61%, were current with respect to payment at March 31, 2021. (c) No interest income was recognized on nonaccrual loans for the three months ended March 31, 2021. In addition, there were $16 million of nonaccrual loans for which there was no related ACLL at March 31, 2021. The following table presents loans by past due status at December 31, 2020: Accruing ($ in Thousands) Current (a) 30-59 Days 60-89 Days 90+ Days Nonaccrual (b)(c) Total PPP $ 767,757 $ — $ — $ — $ — $ 767,757 Commercial and industrial 7,633,269 2,819 3,300 175 61,859 7,701,422 Commercial real estate - owner occupied 899,480 158 215 — 1,058 900,912 Commercial and business lending 9,300,506 2,977 3,516 175 62,917 9,370,091 Commercial real estate - investor 4,251,571 1,024 11,769 — 78,220 4,342,584 Real estate construction 1,839,073 991 — — 353 1,840,417 Commercial real estate lending 6,090,644 2,015 11,769 — 78,573 6,183,001 Total commercial 15,391,150 4,992 15,284 175 141,490 15,553,091 Residential mortgage 7,808,294 8,975 1,410 308 59,337 7,878,324 Home equity 692,565 3,071 1,731 — 9,888 707,255 Other consumer 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 4013 of the CARES Act. (b) Of the total nonaccrual loans, $128 million, or 61%, were current with respect to payment at December 31, 2020. (c) No interest income was recognized on nonaccrual loans for the year ended December 31, 2020. In addition, there were $28 million of nonaccrual loans for which there was no related ACLL at December 31, 2020.
Nonaccrual and performing restructured loans	The following table presents nonaccrual and performing restructured loans by loan portfolio: March 31, 2021 December 31, 2020 ($ in Thousands) Performing Nonaccrual Restructured Loans (a) Performing Nonaccrual Restructured Loans (a) Commercial and industrial $ 11,985 $ 2,114 $ 12,713 $ 6,967 Commercial real estate — owner occupied 1,488 — 1,711 — Commercial real estate — investor 13,627 220 26,435 225 Real estate construction 256 109 260 111 Residential mortgage 10,462 13,537 7,825 11,509 Home equity 1,929 1,644 1,957 1,379 Other consumer 1,073 — 1,191 — Total restructured loans (b) $ 40,820 $ 17,624 $ 52,092 $ 20,190 (a) Nonaccrual restructured loans have been included within nonaccrual loans.
Summary of restructured loans	The following table provides the number of loans modified in a TDR by loan portfolio, the recorded investment, and unpaid principal balance for the three months ended March 31, 2021 and 2020: Three Months Ended March 31, 2021 Three Months Ended March 31, 2020 ($ in Thousands) Number Recorded Investment (a) Unpaid Principal Balance (b) Number Recorded Investment (a) Unpaid Principal Balance (b) Commercial and industrial — $ — $ — 1 $ 48 $ 48 Commercial real estate — owner occupied — — — 1 290 321 Commercial real estate — investor 4 1,693 1,693 1 570 1,740 Real estate construction — — — 1 122 122 Residential mortgage 20 3,876 3,902 18 3,592 3,668 Home equity 1 430 430 8 277 277 Total loans modified 25 $ 5,999 $ 6,025 30 $ 4,899 $ 6,175 (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 three months ended March 31, 2021 and 2020, and the recorded investment in these restructured loans as of March 31, 2021 and 2020: Three Months Ended March 31, 2021 Three Months Ended March 31, 2020 ($ in Thousands) Number of Recorded Number of Recorded Residential mortgage 1 97 3 388 Home equity — — 2 88 Total loans modified 1 $ 97 5 $ 476
Changes in the allowance for loan losses by portfolio segment	The following table presents a summary of the changes in the ACLL by portfolio segment for the three months ended March 31, 2021: ($ in Thousands) December 31, 2020 Charge offs Recoveries Net Charge offs Provision for credit losses March 31, 2021 ACLL / Loans Allowance for loan losses PPP $ 531 $ — $ — $ — $ 76 $ 607 Commercial and industrial 142,793 (3,123) 4,490 1,367 (19,453) 124,707 Commercial real estate — owner occupied 11,274 — 4 4 508 11,786 Commercial and business lending 154,598 (3,123) 4,494 1,370 (18,869) 137,099 Commercial real estate — investor 93,435 (8,739) 2,854 (5,886) 1,694 89,243 Real estate construction 59,193 (3) 31 29 (4,979) 54,243 Commercial real estate lending 152,629 (8,742) 2,885 (5,857) (3,286) 143,486 Total commercial 307,226 (11,865) 7,379 (4,487) (22,155) 280,585 Residential mortgage 42,996 (243) 134 (109) 2,328 45,215 Home equity 18,849 (238) 583 344 (2,822) 16,371 Other consumer 14,630 (827) 315 (511) (3,351) 10,767 Total consumer 76,475 (1,308) 1,031 (277) (3,845) 72,353 Total loans $ 383,702 $ (13,174) $ 8,410 $ (4,764) $ (26,000) $ 352,938 Allowance for unfunded commitments Commercial and industrial 22,311 — — — 2,417 24,728 Commercial real estate — owner occupied 266 — — — 38 304 Commercial and business lending 22,577 — — — 2,455 25,033 Commercial real estate — investor 636 — — — 15 651 Real estate construction 18,887 — — — 422 19,309 Commercial real estate lending 19,523 — — — 437 19,960 Total commercial 42,101 — — — 2,892 44,993 Home equity 3,118 — — — (199) 2,919 Other consumer 2,557 — — — 307 2,865 Total consumer 5,675 — — — 108 5,783 Total loans $ 47,776 $ — $ — $ — $ 3,000 $ 50,776 Allowance for credit losses on loans PPP $ 531 $ — $ — $ — $ 76 $ 607 0.07 % Commercial and industrial 165,105 (3,123) 4,490 1,367 (17,037) 149,435 1.95 % Commercial real estate — owner occupied 11,539 — 4 4 547 12,090 1.37 % Commercial and business lending 177,175 (3,123) 4,494 1,370 (16,414) 162,132 1.73 % Commercial real estate — investor 94,071 (8,739) 2,854 (5,886) 1,709 89,894 2.11 % Real estate construction 78,080 (3) 31 29 (4,557) 73,552 3.91 % Commercial real estate lending 172,152 (8,742) 2,885 (5,857) (2,849) 163,446 2.66 % Total commercial 349,327 (11,865) 7,379 (4,487) (19,262) 325,578 2.10 % Residential mortgage 42,996 (243) 134 (109) 2,328 45,215 0.59 % Home equity 21,967 (238) 583 344 (3,021) 19,290 2.96 % Other consumer 17,187 (827) 315 (511) (3,044) 13,631 4.57 % Total consumer 82,150 (1,308) 1,031 (277) (3,738) 78,136 0.90 % Total loans $ 431,478 $ (13,174) $ 8,410 $ (4,764) $ (23,000) $ 403,714 1.67 %	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) 18,887 Commercial real estate lending 8,062 18,593 26,655 — — — — 47 (7,179) 19,523 Total commercial 20,465 14,595 35,060 — — — — 112 6,929 42,101 Home equity 1,038 2,591 3,629 — — — — 66 (577) 3,118 Other consumer 405 1,504 1,909 — — — — — 649 2,557 Total consumer 1,443 4,095 5,538 — — — — 66 72 5,675 Total loans $ 21,907 $ 18,690 $ 40,597 $ — $ — $ — $ — $ 179 $ 7,000 $ 47,776 Allowance for credit losses on loans PPP $ — $ — $ — $ — $ — $ — $ — $ — $ 531 $ 531 0.07 % Commercial and industrial 103,409 48,921 152,330 (80,320) 7,004 (73,316) 293 469 85,327 165,105 2.14 % Commercial real estate — owner occupied 10,411 (1,851) 8,560 (419) 147 (272) 890 259 2,102 11,539 1.28 % Commercial and business lending 113,820 47,070 160,890 (80,739) 7,151 (73,588) 1,183 728 87,961 177,175 1.89 % Commercial real estate — investor 41,044 2,287 43,331 (22,920) 643 (22,277) 753 474 71,792 94,071 2.17 % Real estate construction 32,447 25,814 58,261 (19) 49 31 435 537 18,816 78,080 4.24 % Commercial real estate lending 73,490 28,101 101,591 (22,938) 692 (22,246) 1,188 1,011 90,608 172,152 2.78 % Total commercial 187,311 75,171 262,482 (103,677) 7,844 (95,834) 2,371 1,739 178,569 349,327 2.25 % Residential mortgage 16,960 33,215 50,175 (1,867) 500 (1,367) 651 403 (6,864) 42,996 0.55 % Home equity 11,964 14,240 26,204 (1,719) 1,978 259 422 440 (5,358) 21,967 3.11 % Other consumer 7,044 8,520 15,564 (4,790) 1,101 (3,689) 61 140 5,111 17,187 5.49 % Total consumer 35,968 55,975 91,943 (8,376) 3,579 (4,797) 1,134 983 (7,112) 82,150 0.92 % Total loans $ 223,278 $ 131,147 $ 354,425 $ (112,053) $ 11,422 $ (100,631) $ 3,504 $ 2,722 $ 171,457 $ 431,478 1.76 %

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of core deposit intangibles and other intangibles	For CDIs and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows: ($ in Thousands) Three Months Ended March 31, 2021 Year Ended December 31, 2020 Core deposit intangibles Gross carrying amount at the beginning of the year $ 88,109 $ 80,730 Additions during the period — 7,379 Accumulated amortization (23,408) (21,205) Net book value $ 64,701 $ 66,904 Amortization during the year $ 2,203 $ 8,749 Other intangibles Gross carrying amount at the beginning of the year $ 2,000 $ 38,970 Additions during the period — 200 Reductions due to sale (1,317) (17,435) Accumulated amortization (683) (20,385) Net book value $ — $ 1,350 Amortization during the year $ 33 $ 1,443
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance	A summary of changes in the balance of the MSRs asset and the MSRs valuation allowance is as follows: ($ in Thousands) Three Months Ended March 31, 2021 Year Ended December 31, 2020 Mortgage servicing rights Mortgage servicing rights at beginning of period $ 59,967 $ 67,607 Additions from acquisition — 1,357 Additions 3,348 13,667 Amortization (6,388) (22,664) Mortgage servicing rights at end of period $ 56,927 $ 59,967 Valuation allowance at beginning of period $ (18,006) $ (302) (Additions) recoveries, net 10,578 (17,704) Valuation allowance at end of period $ (7,428) $ (18,006) Mortgage servicing rights, net $ 49,500 $ 41,961 Fair value of mortgage servicing rights $ 49,541 $ 41,990 Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 7,313,308 $ 7,743,956 Mortgage servicing rights, net to servicing portfolio 0.68 % 0.54 % Mortgage servicing rights expense (a) $ (4,190) $ 40,369
Summary of estimated future amortization expense	The following table shows the estimated future amortization expense for amortizing intangible assets: ($ in Thousands) Core Deposit Intangibles Mortgage Servicing Rights Nine Months Ending December 31, 2021 $ 6,608 $ 8,345 2022 8,811 11,550 2023 8,811 8,909 2024 8,811 6,983 2025 8,811 5,547 2026 8,811 4,466 Beyond 2026 14,038 11,125 Total Estimated Amortization Expense $ 64,701 $ 56,927

Short and Long-Term Funding (Ta

Short and Long-Term Funding (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Breakdown of short & long-term debt balances	The following table presents the components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year): ($ in Thousands) March 31, 2021 December 31, 2020 Short-Term Funding Federal funds purchased $ 7,450 $ 7,070 Securities sold under agreements to repurchase 131,057 185,901 Federal funds purchased and securities sold under agreements to repurchase 138,507 192,971 Commercial paper 51,171 59,346 Total short-term funding $ 189,678 $ 252,317 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 1,091 1,128 Capitalized costs (1,362) (1,663) FHLB advances 1,629,966 $ 1,632,723 Total long-term funding 2,179,694 2,182,188 Total short and long-term funding $ 2,369,372 $ 2,434,505
Remaining contractual maturity of securities sold under agreements to repurchase	The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets as of March 31, 2021 and December 31, 2020 are presented in the following table: Remaining Contractual Maturity of the Agreements ($ in Thousands) Overnight and Continuous Up to 30 days 30-90 days Greater than 90 days Total March 31, 2021 Repurchase agreements Agency mortgage-related securities $ 131,057 $ — $ — $ — $ 131,057 Total $ 131,057 $ — $ — $ — $ 131,057 December 31, 2020 Repurchase agreements Agency mortgage-related securities $ 185,901 $ — $ — $ — $ 185,901 Total $ 185,901 $ — $ — $ — $ 185,901

Derivative and Hedging Activi_2

Derivative and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary Of Other derivative instruments not designated as hedging instruments	The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments as of March 31, 2021 and December 31, 2020. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of March 31, 2021 and December 31, 2020. The resulting net derivative asset and liability fair values are included in other assets and accrued expenses and other liabilities, respectively, on the consolidated balance sheets. March 31, 2021 December 31, 2020 Asset Liability Asset Liability ($ in Thousands) Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Notional Amount Fair Value Not designated as hedging instruments Interest rate-related instruments $ 3,654,732 $ 121,020 $ 3,654,732 $ 28,382 $ 3,639,679 $ 192,518 $ 3,639,679 $ 25,680 Foreign currency exchange forwards 448,395 3,044 439,381 2,828 411,292 4,909 398,890 4,836 Commodity contracts 70,633 5,808 70,758 5,098 87,547 12,486 83,214 11,155 Mortgage banking (a)(b) 292,704 11,171 408,500 — 226,818 9,624 335,500 2,046 Gross derivatives before netting $ 141,043 $ 36,308 $ 219,537 $ 43,716 Less: Legally enforceable master netting agreements 2,643 2,643 1,936 1,936 Less: Cash collateral pledged/received 1,581 17,583 10,879 25,625 Total derivative instruments, after netting $ 136,819 $ 16,082 $ 206,722 $ 16,155 (a) Mortgage derivative assets include interest rate lock commitments and mortgage derivative liabilities include forward commitments. (b) Includes $4 million forward commitment fair value.
Schedule of cash flow hedging instruments, statements of financial performance and financial position location	The table below identifies the effect of fair value hedge accounting on the Corporation's consolidated statements of income for the three months ended March 31, 2021 and 2020: Location and Amount of Gain or (Loss) Recognized in Income on Three Months Ended March 31, 2021 2020 ($ 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 the fair value hedge is recorded $ (485) $ — $ (322) $ (262) The effects of fair value hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 Interest contracts Hedged items (485) — (322) (262) Derivatives designated as hedging instruments (a) — — — — (a) Includes net settlements on the derivatives.
Gain (loss) on derivative instruments not designated as hedging instruments	The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's consolidated statements of income for the three months ended March 31, 2021 and 2020: Consolidated Statements of Income Category of Three Months Ended March 31, ($ in Thousands) 2021 2020 Derivative Instruments Interest rate-related instruments — customer and mirror, net Capital markets, net $ 2,938 $ (3,090) Foreign currency exchange forwards Capital markets, net 143 (122) Commodity contracts Capital markets, net (621) 746 Interest rate lock commitments (mortgage) Mortgage banking, net (2,708) 9,928 Forward commitments (mortgage) Mortgage banking, net (6,300) (10,262)

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	3 Months Ended
	Mar. 31, 2021
Offsetting [Abstract]
Balance sheet offsetting of derivative assets and liabilities	The following table presents the interest rate, commodity, and foreign exchange assets and liabilities subject to an enforceable master netting arrangement. The interest, commodity and foreign exchange agreements the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement and are therefore excluded from this table: Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Received Net Amount Derivative assets March 31, 2021 $ 4,496 $ (2,643) $ (1,581) $ 272 $ — $ 272 December 31, 2020 13,441 (1,936) (10,879) 626 — 626 Gross Amounts Recognized Gross Amounts Subject to Master Netting Arrangements Offset on the Consolidated Balance Sheets Net Amounts Presented on the Consolidated Balance Sheets Gross Amounts Not Offset on the Consolidated Balance Sheets ($ in Thousands) Derivative Cash Collateral Pledged Net Amount Derivative liabilities March 31, 2021 $ 20,393 $ (2,643) $ (17,583) $ 167 $ — $ 167 December 31, 2020 27,951 (1,936) (25,625) 390 — 390

Commitments, Off-Balance Shee_2

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Summary of lending-related and other commitments	The following is a summary of lending-related commitments: ($ in Thousands) March 31, 2021 December 31, 2020 Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a)(b) $ 10,102,713 $ 10,010,492 Commercial letters of credit (a) 7,301 3,642 Standby letters of credit (c) 247,473 278,798 (a) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and was not material at March 31, 2021 or December 31, 2020. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10. (c) The Corporation has established a liability of $3 million for both March 31, 2021 and December 31, 2020, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]	The following table presents a summary of the changes in the allowance for unfunded commitments: ($ in Thousands) Three Months Ended March 31, 2021 Year Ended December 31, 2020 Allowance for Unfunded Commitments Balance at beginning of period $ 47,776 $ 21,907 Cumulative effect of ASU 2016-13 adoption (CECL) N/A 18,690 Balance at beginning of period, adjusted 47,776 40,597 Provision for unfunded commitments 3,000 7,000 Amount recorded at acquisition — 179 Balance at end of period $ 50,776 $ 47,776

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Assets and liabilities measured on recurring basis at fair value	The table below presents the Corporation’s financial instruments measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020, aggregated by the level in the fair value hierarchy within which those measurements fall: ($ in Thousands) Fair Value Hierarchy March 31, 2021 December 31, 2020 Assets Investment securities AFS U.S. Treasury securities Level 1 $ 53,693 $ 26,531 Agency securities Level 2 14,904 25,038 Obligations of state and political subdivisions (municipal securities) Level 2 433,182 450,662 Residential mortgage-related securities FNMA / FHLMC Level 2 1,910,954 1,461,241 GNMA Level 2 123,365 235,537 Commercial mortgage-related securities FNMA / FHLMC Level 2 94,349 22,904 GNMA Level 2 389,411 524,756 Asset backed securities FFELP Level 2 325,933 327,189 SBA Level 2 8,160 8,584 Other debt securities Level 2 3,000 3,000 Total investment securities AFS Level 1 $ 53,693 $ 26,531 Total investment securities AFS Level 2 3,303,257 3,058,910 Equity securities with readily determinable fair values Level 1 1,684 1,661 Residential loans held for sale Level 2 153,151 129,158 Interest rate-related instruments (a) Level 2 121,020 192,518 Foreign currency exchange forwards (a) Level 2 3,044 4,909 Commodity contracts (a) Level 2 5,808 12,486 Interest rate lock commitments to originate residential mortgage loans held for sale Level 3 6,917 9,624 Forward commitments to sell residential mortgage loans Level 3 4,255 — Liabilities Interest rate-related instruments (a) Level 2 $ 28,382 $ 25,680 Foreign currency exchange forwards (a) Level 2 2,828 4,836 Commodity contracts (a) Level 2 5,098 11,155 Forward commitments to sell residential mortgage loans Level 3 — 2,046
Assets and liabilities measured at fair value using significant unobservable inputs (level 3)	The table below presents a rollforward of the consolidated balance sheets amounts for the three months ended March 31, 2021 and the year ended December 31, 2020, for the Corporation's mortgage derivatives measured on a recurring basis and classified within Level 3 of the fair value hierarchy: ($ in Thousands) Interest rate lock commitments to originate residential mortgage loans held for sale Forward commitments to sell residential mortgage loans Total Balance December 31, 2019 $ 2,527 $ 710 $ 1,817 New production 72,659 (3,505) 76,164 Closed loans / settlements (76,001) (12,587) (63,414) Other 10,439 17,427 (6,988) Mortgage derivative gain (loss) 7,097 1,335 5,762 Balance December 31, 2020 $ 9,624 $ 2,046 $ 7,579 New production $ 16,629 $ (1,203) $ 17,832 Closed loans / settlements (14,186) 2,501 (16,687) Other (5,151) (7,598) 2,447 Mortgage derivative gain (loss) (2,708) (6,300) 3,593 Balance March 31, 2021 $ 6,917 $ (4,255) $ 11,171
Equity securities without readily determinable fair value	The following table presents the carrying value of equity securities without readily determinable fair values still held as of March 31, 2021 that are measured under the measurement alternative and the related adjustments recorded during the periods presented for those securities with observable price changes. These securities are included in the nonrecurring fair value tables when applicable price changes are observable. Also shown are the cumulative upward and downward adjustments for the Corporation's equity securities without readily determinable fair values as of March 31, 2021: ($ in Thousands) Equity securities without readily determinable fair values Carrying value as of December 31, 2020 $ 13,444 Carrying value changes — Additions 544 Carrying value as of March 31, 2021 $ 13,989 Cumulative upward carrying value changes between January 1, 2018 and March 31, 2021 $ 13,444 Cumulative downward carrying value changes/impairment between January 1, 2018 and March 31, 2021 $ —
Assets and liabilities measured on nonrecurring basis at fair value	The table below presents the Corporation’s assets measured at fair value on a nonrecurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall: Consolidated Statements of Income Adjustment Recognized on the Consolidated Statements of Income (c) ($ in Thousands) Fair Value Hierarchy Fair Value March 31, 2021 Assets Individually evaluated loans (a) Level 3 $ 93,201 Provision for credit losses $ (1,613) OREO (b) Level 2 10,326 Other noninterest expense 3,681 Mortgage servicing rights Level 3 49,541 Mortgage banking, net 10,578 December 31, 2020 Assets Individually evaluated loans (a) Level 3 $ 138,752 Provision for credit losses $ 97,519 OREO (b) Level 2 6,125 Other noninterest expense 3,747 Mortgage servicing rights Level 3 41,990 Mortgage banking, net (17,704) (a) Includes probable TDRs which are individually analyzed, net of the related allowance for credit losses. (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) Includes the full year impact on the consolidated statements of income
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: March 31, 2021 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 10% - 45% 16% Individually evaluated loans Appraisals / Discounted cash flow Collateral / Discount factor 25% - 38% 34%
Estimated fair values of financial instruments	Fair value estimates are set forth below for the Corporation’s financial instruments: March 31, 2021 December 31, 2020 ($ in Thousands) Fair Value Hierarchy Level Carrying Amount Fair Value Carrying Amount Fair Value Financial assets Cash and due from banks Level 1 $ 356,285 $ 356,285 $ 416,154 $ 416,154 Interest-bearing deposits in other financial institutions Level 1 1,590,494 1,590,494 298,759 298,759 Federal funds sold and securities purchased under agreements to resell Level 1 — — 1,135 1,135 Investment securities AFS Level 1 53,693 53,693 26,531 26,531 Investment securities AFS Level 2 3,303,257 3,303,257 3,058,910 3,058,910 Investment securities HTM, net Level 1 1,000 1,019 999 1,024 Investment securities HTM, net Level 2 1,856,088 1,971,459 1,877,939 2,027,852 Equity securities with readily determinable fair values Level 1 1,684 1,684 1,661 1,661 Equity securities without readily determinable fair values Level 3 13,989 13,989 13,444 13,444 FHLB and Federal Reserve Bank stocks Level 2 168,281 168,281 168,280 168,280 Residential loans held for sale Level 2 153,151 153,151 129,158 129,158 Loans, net Level 3 23,809,389 23,723,543 24,068,022 24,012,738 Bank and corporate owned life insurance Level 2 680,831 680,831 679,647 679,647 Derivatives (other assets) (a) Level 2 129,872 129,872 209,913 209,913 Interest rate lock commitments to originate residential mortgage loans held for sale (other assets) Level 3 6,917 6,917 9,624 9,624 Forward commitments to sell residential mortgage loans (other assets) Level 3 4,255 4,255 — — Financial liabilities Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts Level 3 $ 26,115,814 $ 26,115,814 $ 24,725,451 $ 24,725,451 Brokered CDs and other time deposits (b) Level 2 1,561,352 1,566,421 1,757,030 1,766,200 Short-term funding Level 2 189,678 189,672 252,317 252,303 FHLB advances Level 2 1,629,966 1,693,172 1,632,723 1,760,727 Other long-term funding Level 2 549,729 576,183 549,465 578,233 Standby letters of credit (c) Level 2 2,549 2,549 2,731 2,731 Derivatives (accrued expenses and other liabilities) (a) Level 2 36,308 36,308 41,671 41,671 Forward commitments to sell residential mortgage loans (accrued expenses and other liabilities) Level 3 — — 2,046 2,046 (a) Figures are presented gross before netting. See Note 10 and Note 11 for information relating to the impact of offsetting derivative assets and liabilities and cash collateral with the 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 commitment on standby letters of credit was $247 million at March 31, 2021 and $279 million at December 31, 2020. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Net period benefit cost for the pension and postretirement plans	The components of net periodic pension cost and net periodic benefit cost for the RAP and Postretirement Plan for the three months ended March 31, 2021 and 2020 were as follows: Three Months Ended March 31, ($ in Thousands) 2021 2020 Components of Net Periodic Benefit Cost RAP Service cost $ 2,075 $ 2,165 Interest cost 1,623 2,008 Expected return on plan assets (6,430) (6,405) Amortization of prior service cost (18) (19) Amortization of actuarial loss (gain) 1,050 808 Total net periodic pension cost $ (1,701) $ (1,444) Postretirement Plan Interest cost $ 13 $ 20 Amortization of prior service cost (19) (19) Total net periodic benefit cost $ (6) $ 1

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Selected segment information	Information about the Corporation’s segments is presented below: Corporate and Commercial Specialty Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 93,161 $ 107,753 Net intersegment interest income (expense) 6,684 (10,726) Segment net interest income 99,845 97,028 Noninterest income (a) 43,031 38,733 Total revenue 142,876 135,761 Provision for credit losses 17,509 12,172 Noninterest expense 57,725 54,304 Income (loss) before income taxes 67,642 69,284 Income tax expense (benefit) 12,649 12,940 Net income $ 54,993 $ 56,344 Allocated goodwill $ 525,836 $ 530,144 Community, Consumer, and Business Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 68,275 $ 74,927 Net intersegment interest income (expense) 12,875 18,665 Segment net interest income 81,150 93,592 Noninterest income 46,128 53,350 Total revenue 127,278 146,942 Provision for credit losses 5,099 5,108 Noninterest expense 97,346 113,777 Income (loss) before income taxes 24,834 28,057 Income tax expense (benefit) 5,215 5,892 Net income $ 19,618 $ 22,165 Allocated goodwill $ 579,156 $ 661,244 Risk Management and Shared Services Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 14,465 $ 20,261 Net intersegment interest income (expense) (19,559) (7,939) Segment net interest income (5,094) 12,322 Noninterest income 6,184 6,223 Total revenue 1,091 18,545 Provision for credit losses (45,612) 35,720 Noninterest expense 20,275 24,110 Income (loss) before income taxes 26,427 (41,285) Income tax expense (benefit) 6,737 (8,613) Net income $ 19,690 $ (32,672) Allocated goodwill $ — $ — Consolidated Total Three Months Ended March 31, ($ in Thousands) 2021 2020 Net interest income $ 175,902 $ 202,942 Net intersegment interest income (expense) — — Segment net interest income 175,902 202,942 Noninterest income (a) 95,343 98,306 Total revenue 271,245 301,248 Provision for credit losses (23,004) 53,001 Noninterest expense 175,347 192,191 Income (loss) before income taxes 118,903 56,056 Income tax expense (benefit) 24,602 10,219 Net income $ 94,301 $ 45,838 Allocated goodwill $ 1,104,992 $ 1,191,388

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Summary of activity in accumulated other comprehensive income (loss)	The following tables summarize the components of accumulated other comprehensive income (loss) at March 31, 2021 and 2020, including changes during the preceding three month periods as well as any reclassifications out of accumulated other comprehensive income (loss): ($ in Thousands) Investment Defined Benefit Accumulated Balance December 31, 2020 $ 41,325 $ (28,707) $ 12,618 Other comprehensive income (loss) before reclassifications (23,979) — (23,979) Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net 39 — 39 Personnel expense — (37) (37) Other expense — 1,050 1,050 Interest income 518 — 518 Income tax (expense) benefit 5,851 (253) 5,598 Net other comprehensive income (loss) during period (17,571) 760 (16,811) Balance March 31, 2021 $ 23,754 $ (27,947) $ (4,193) Balance December 31, 2019 $ 3,989 $ (37,172) $ (33,183) Other comprehensive income (loss) before reclassifications 26,419 — 26,419 Amounts reclassified from accumulated other comprehensive income (loss) Investment securities losses (gains), net (6,118) — (6,118) Personnel expense — (38) (38) Other expense — 808 808 Interest income 556 — 556 Income tax (expense) benefit (5,225) (193) (5,418) Net other comprehensive income (loss) during period 15,632 577 16,209 Balance March 31, 2020 $ 19,620 $ (36,595) $ (16,974)

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue Recognition [Abstract]
Disaggregation of revenue by Major source	The Corporation's disaggregated revenue by major source is presented below: Corporate and Commercial Specialty Three Months Ended March 31, ($ in Thousands) 2021 2020 Wealth management fees $ 22,414 $ 20,106 Service charges and deposit account fees 4,905 3,551 Card-based fees (a) 435 515 Insurance commissions and fees 24 76 Other revenue 685 788 Noninterest income (in-scope of Topic 606) $ 28,463 $ 25,036 Noninterest income (out-of-scope of Topic 606) 14,568 13,697 Total noninterest income $ 43,031 $ 38,733 Community, Consumer, and Business Three Months Ended March 31, ($ in Thousands) 2021 2020 Wealth management fees $ — $ 710 Service charges and deposit account fees 9,935 11,665 Card-based fees (a) 9,325 9,045 Insurance commissions and fees 50 22,529 Other revenue 3,579 2,286 Noninterest income (in-scope of Topic 606) $ 22,889 $ 46,235 Noninterest income (out-of-scope of Topic 606) 23,239 7,115 Total noninterest income $ 46,128 $ 53,350 Risk Management and Shared Services Three Months Ended March 31, ($ in Thousands) 2021 2020 Service charges and deposit account fees 15 5 Card-based fees (a) 4 47 Insurance commissions and fees 2 3 Other revenue 389 23 Noninterest income (in-scope of Topic 606) $ 409 $ 77 Noninterest income (out-of-scope of Topic 606) 5,775 6,146 Total noninterest income $ 6,184 $ 6,223 Consolidated Total Three Months Ended March 31, ($ in Thousands) 2021 2020 Wealth management fees $ 22,414 $ 20,816 Service charges and deposit account fees 14,855 15,222 Card-based fees (a) 9,764 9,607 Insurance commissions and fees 76 22,608 Other revenue 4,653 3,096 Noninterest income (in-scope of Topic 606) $ 51,762 $ 71,348 Noninterest income (out-of-scope of Topic 606) 43,581 26,958 Total noninterest income $ 95,343 $ 98,306 (a) Certain card-based fees are out-of-scope of Topic 606.
Revenue recognition 606	Below is a listing of performance obligations for the Corporation's main revenue streams: Revenue Stream Noninterest income in-scope of Topic 606 Service charges and deposit account fees Service charges and deposit account fees consist of monthly service fees (i.e. business analyzed fees and consumer service charges) and other deposit account related fees. The Corporation's performance obligation for monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Other deposit account related fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges and deposit account fees is primarily received immediately or in the following month through a direct charge to customers’ accounts. Card-based fees (a) Card-based fees are primarily comprised of debit and credit card income, ATM fees, and merchant services income. Debit and credit card income is primarily comprised of interchange fees earned whenever the Corporation's debit and credit cards are processed through card payment networks. ATM and merchant fees are largely transactional based, and therefore, the Corporation's performance obligation is satisfied, and related revenue recognized, at a point in time. Payment is typically received immediately or in the following month. Trust and asset management fees (b) Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Corporation's performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to the customers’ accounts. The Corporation's performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e., as incurred). Payment is received shortly after services are rendered. Brokerage and advisory fees (b) Brokerage and advisory fees primarily consist of investment advisory, brokerage, retirement services, and annuities. The Corporation's performance obligation for investment advisory services and retirement services is generally satisfied, and the related revenue recognized, over the period in which the services are provided. The performance obligation for annuities is satisfied upon sale of the annuity, and therefore, the related revenue is primarily recognized at the time of sale. Payment for these services are typically received immediately or in advance of the service. (a) Certain card-based fees are out-of-scope of Topic 606. (b) Trust and asset management fees and brokerage and advisory fees are included in wealth management fees.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Lease, Cost and Cash Flows	Operating and finance lease costs and cash flows resulting from these leases are presented below: Three Months Ended March 31, ($ in Thousands) 2021 2020 Operating lease costs $ 2,240 $ 2,623 Finance lease costs 39 36 Operating lease cash flows 2,963 2,731 Finance lease cash flows 40 21
Components of lease expense	The lease classifications on the consolidated balance sheets were as follows: ($ in Thousands) Consolidated Balance Sheets Category March 31, 2021 December 31, 2020 Amount Operating lease right-of-use asset Premises and equipment $ 32,071 $ 31,994 Finance lease right-of-use asset Other assets 854 962 Operating lease liability Accrued expenses and other liabilities 36,079 36,425 Finance lease liability Other long-term funding 1,091 1,128
Operating lease information	The lease payment obligations, weighted-average remaining lease term, and weighted-average discount rate were as follows: March 31, 2021 December 31, 2020 ($ in Thousands) Lease payments Weighted-average lease term (in years) Weighted-average discount rate Lease payments Weighted-average lease term (in years) Weighted-average discount rate Operating leases Equipment $ 385 2.24 0.46 % $ 386 2.49 0.46 % Retail and corporate offices 33,707 5.94 3.27 % 34,036 6.04 3.33 % Land 6,165 8.83 3.10 % 6,385 8.99 3.09 % Total operating leases $ 40,257 6.33 3.22 % $ 40,806 6.45 3.27 % Finance leases Land $ 1,105 1.40 1.05 % $ 1,145 1.65 1.05 % Total finance leases $ 1,105 1.40 1.05 % $ 1,145 1.65 1.05 %
Amortization of operating lease liabilities	Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Nine Months Ending December 31, 2021 $ 6,591 $ 132 $ 6,724 2022 7,111 973 8,084 2023 6,010 — 6,010 2024 5,274 — 5,274 2025 4,110 — 4,110 Beyond 2025 11,160 — 11,160 Total lease payments $ 40,257 $ 1,105 $ 41,362 Less: interest 4,178 14 4,192 Present value of lease payments $ 36,079 $ 1,091 $ 37,170

Acquisitions Staunton Acquisiti

Acquisitions Staunton Acquisition (Details) - USD ($) $ in Thousands	Feb. 14, 2020	Sep. 30, 2020	Mar. 31, 2021	Mar. 31, 2020
February 14, 2020
Fair value of liabilities assumed			$ 0	$ 479,985
First Staunton Bancshares [Member]
Purchase Accounting Adjustments
Cash and cash equivalents	$ 0
Investment securities AFS	(24)
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	0
Loans	(4,808)
Premises and equipment, net	(3,005)
Bank owned life insurance	9
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	7,379
OREO (included in other assets on the face of the consolidated balance sheets)	670
Other assets	2,795
Deposits	1,285
Other borrowings	61
Accrued expenses and other liabilities	179
February 14, 2020
Cash and cash equivalents	44,782
Investment securities AFS	98,743
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	781
Loans	369,741
Premises and equipment, net	4,865
Bank owned life insurance	6,770
Goodwill	14,812	$ 15,000
Core deposit intangibles (included in other intangible assets, net on the face of the consolidated balance sheets)	7,379
OREO (included in other assets on the face of the consolidated balance sheets)	762
Other assets	7,692
Total assets	556,328
Deposits	438,684
Other borrowings	34,613
Accrued expenses and other liabilities	6,730
Fair value of liabilities assumed	480,028
Total consideration paid	$ 76,300

Acquisitions, PCD Loans (Detail

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

Acquisitions (Details Textuals)

Acquisitions (Details Textuals) $ in Thousands	Dec. 11, 2020USD ($)branch	Sep. 12, 2020branch	Jun. 30, 2020USD ($)	Feb. 14, 2020USD ($)branch	Mar. 31, 2021USD ($)	Sep. 30, 2020USD ($)	Mar. 01, 2021USD ($)	Feb. 26, 2021USD ($)	Dec. 31, 2020USD ($)	Jun. 14, 2019branch
Business Acquisition [Line Items]
Deposits					$ 27,677,166			$ 31,000	$ 26,482,481
Huntington National Bank
Business Acquisition [Line Items]
Business Combination, Control Obtained Description	4% purchase premium on deposits transferred	4% purchase premium on deposits
New Communities | branch										10
First Staunton Bancshares [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition				Feb. 14, 2020
Business Acquisition, Name of Acquired Entity				First Staunton
Business Combination, Control Obtained Description				The purchase price was based on an assumed 4% deposit premium at announcement.
New Communities | branch				9
Acquired Net Branches | branch				7
Goodwill				$ 14,812		$ 15,000
PCD - HTM Securities				0
PCD - AFS Securities				0
Total consideration paid				$ 76,300
ABRC
Business Acquisition [Line Items]
Total consideration paid			$ 266,000
Pre-tax book gain on sale			$ 163,000
Peoria, IL [Member]
Business Acquisition [Line Items]
Disposed Net Branches | branch		5
Deposits	$ 180,000
Southwest Wisconsin [Member]
Business Acquisition [Line Items]
Disposed Net Branches | branch	2
Deposits	$ 53,000
Whitnell
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Consideration							$ 8,000
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax					$ 2,000

Summary of Significant Accoun_3

Summary of Significant Accounting Policies, Credit Loss Adoption Impact (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 50,776	$ 47,776		$ 21,907
Cumulative Effect, Period Of Adoption, Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability			$ 40,597

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	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	$ (63)	$ (67)
Retained Earnings (Accumulated Deficit)	2,520,144	2,458,920
Off-Balance Sheet, Credit Loss, Liability	50,776	47,776		$ 21,907
Allowance for Loan Losses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss	352,938	383,702		201,371
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 50,776	$ 47,776		$ 21,907
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability			$ 18,690
Accounting Standards Update 2016-13 | Allowance for Loan Losses [Member] | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing Receivable, Allowance for Credit Loss			112,457
Accounting Standards Update 2016-13 | SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-Balance Sheet, Credit Loss, Liability			$ 18,690

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Calculations for basic and diluted earnings per common share
Net income	$ 94,301	$ 45,838
Preferred stock dividends	(5,207)	(3,801)
Net income available to common equity	89,094	42,037
Common shareholder dividends	(27,661)	(28,264)
Unvested share-based payment awards	(209)	(128)
Undistributed earnings	61,224	13,645
Undistributed earnings allocated to common shareholders	60,836	13,555
Undistributed earnings allocated to unvested share-based payment awards	387	90
Undistributed earnings	61,224	13,645
Basic
Distributed earnings to common shareholders	27,661	28,264
Undistributed earnings allocated to common shareholders	60,836	13,555
Total common shareholders earnings, basic	88,497	41,819
Diluted
Distributed earnings to common shareholders	27,661	28,264
Undistributed earnings allocated to common shareholders	60,836	13,555
Total common shareholders earnings, diluted	$ 88,497	$ 41,819
Weighted average common shares outstanding	152,355	154,701
Effect of dilutive common stock awards	1,333	918
Diluted weighted average common shares outstanding	153,688	155,619
Basic earnings per common share	$ 0.58	$ 0.27
Diluted earnings per common share	$ 0.58	$ 0.27

Earnings Per Common Share (De_2

Earnings Per Common Share (Details Textuals) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Approximate anti-dilutive stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3	4

Stock-Based Compensation Fair V

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

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	6,473
Exercised	615
Forfeited or expired	35
Stock Options Shares Outstanding, Ending balance (in shares)	5,823	6,473
Options exercisable (in shares)	4,240
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Option Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 19.77
Exercised	15.96
Forfeited	20.99
Stock Option Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	20.17	$ 19.77
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 20.19
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 2 months 15 days	6 years 2 months 23 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 20 days
Stock Options Outstanding, Aggregate Intrinsic Value, Beginning balance	$ 2,005
Stock Options Outstanding, Aggregate Intrinsic Value, Ending balance	13,099	$ 2,005
Options exercisable, Aggregate Intrinsic Value	$ 10,154

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Beginning balance (in shares) | shares	2,293
Granted | shares	771
Vested | shares	571
Forfeited | shares	28
Outstanding Shares, Ending balance (in shares) | shares	2,466
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance (in usd per share) | $ / shares	$ 20.70
Granted, Weighted Average Grant Date Fair Value | $ / shares	19.59
Vested, Weighted Average Grant Date Fair Value | $ / shares	21.69
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	24.13
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share) | $ / shares	$ 19.72

Stock-Based Compensation (Detai

Stock-Based Compensation (Details Textuals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Intrinsic value of stock options exercised	$ 3,000	$ 1,000
Total fair value of vested stock options	$ 3,000	3,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	150.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting	$ 403	$ 2,000
Unvested share-based payment awards	$ 2,000
Remaining requisite service periods, extend through	first quarter of 2024
Performance-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Service-based Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years	4 years
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award
Recognized compensation expense for vesting	$ 3,000	$ 9,000
Recognized compensation expense for accelerated vesting	1,000
Unvested share-based payment awards	$ 24,000
Remaining requisite service periods, extend through	first quarter of 2025

Investment Securities, AFS and

Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment securities AFS
Amortized Cost	$ 3,323,846	$ 3,028,399
Gross Unrealized Gains	42,885	60,612
Gross Unrealized (Losses)	(9,782)	(3,570)
Fair Value	3,356,949	3,085,441
Investment securities HTM
Investment securities HTM, net	1,857,150	1,879,005
Held-to-maturity, Gross Unrealized Gains	118,544	149,938
Held-to-maturity, Gross Unrealized Loss	(3,154)	0
Held-to-maturity, Fair Value	1,972,541	2,028,943
Fair Value, Inputs, Level 2
Investment securities AFS
Fair Value	3,303,257	3,058,910
Investment securities HTM
Investment securities HTM, net	1,856,088	1,877,939
Held-to-maturity, Fair Value	1,971,459	2,027,852
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | FFELP
Investment securities AFS
Fair Value	325,933	327,189
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other Debt And Other Equity Securities
Investment securities AFS
Fair Value	3,000	3,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | SBA
Investment securities AFS
Fair Value		8,584
Fair Value, Inputs, Level 1
Investment securities AFS
Fair Value	53,693	26,531
Investment securities HTM
Investment securities HTM, net	1,000	999
Held-to-maturity, Fair Value	1,019	1,024
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other Debt And Other Equity Securities
Investment securities AFS
Fair Value	1,684	1,661
U. S. Treasury securities
Investment securities AFS
Amortized Cost	54,237	26,436
Gross Unrealized Gains	0	95
Gross Unrealized (Losses)	(544)	0
Fair Value		26,531
Investment securities HTM
Investment securities HTM, net	1,000	999
Held-to-maturity, Gross Unrealized Gains	20	25
Held-to-maturity, Gross Unrealized Loss	0	0
U. S. Treasury securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Investment securities AFS
Fair Value	53,693	26,531
Agency Securities
Investment securities AFS
Amortized Cost	15,000	24,985
Gross Unrealized Gains	0	53
Gross Unrealized (Losses)	(96)	0
Agency Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Investment securities AFS
Fair Value	14,904	25,038
Obligations of state and political subdivisions (municipal securities)
Investment securities AFS
Amortized Cost	411,964	425,057
Gross Unrealized Gains	21,218	25,605
Gross Unrealized (Losses)	0	0
Fair Value	433,182	450,662
Investment securities HTM
Investment securities HTM, net	1,455,462	1,441,900
Held-to-maturity, Gross Unrealized Gains	106,933	133,544
Held-to-maturity, Gross Unrealized Loss	(994)	0
Held-to-maturity, Fair Value	1,561,401	1,575,445
Obligations of state and political subdivisions (municipal securities) | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Investment securities AFS
Fair Value	433,182	450,662
FFELP
Investment securities AFS
Amortized Cost	325,812	329,030
Gross Unrealized Gains	1,675	1,172
Gross Unrealized (Losses)	(1,554)	(3,013)
Fair Value	325,933
Investment securities HTM
Investment securities HTM, net	0
Held-to-maturity, Fair Value	0
SBA
Investment securities AFS
Amortized Cost	8,216	8,637
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(57)	(53)
Fair Value	8,160
Investment securities HTM
Investment securities HTM, net	0
Held-to-maturity, Fair Value	0
SBA | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Investment securities AFS
Fair Value	8,160	8,584
Other debt securities
Investment securities AFS
Amortized Cost	3,000	3,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
FNMA / FHLMC | Residential Related Securities
Investment securities AFS
Amortized Cost	1,910,644	1,448,806
Gross Unrealized Gains	5,956	12,935
Gross Unrealized (Losses)	(5,647)	(500)
Fair Value	1,910,954
Investment securities HTM
Investment securities HTM, net	47,480	54,599
Held-to-maturity, Gross Unrealized Gains	2,471	2,891
Held-to-maturity, Gross Unrealized Loss	0	0
Held-to-maturity, Fair Value	49,951	57,490
FNMA / FHLMC | Commercial mortgage-related securities
Investment securities AFS
Amortized Cost	93,902	19,654
Gross Unrealized Gains	2,330	3,250
Gross Unrealized (Losses)	(1,883)	0
Fair Value	94,349
Investment securities HTM
Investment securities HTM, net	63,844	11,211
Held-to-maturity, Gross Unrealized Gains	157	0
Held-to-maturity, Gross Unrealized Loss	(2,138)	0
Held-to-maturity, Fair Value	61,863	11,211
GNMA [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities
Investment securities AFS
Fair Value	389,411	524,756
GNMA [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities
Investment securities AFS
Fair Value	123,365	235,537
GNMA [Member] | Residential Related Securities
Investment securities AFS
Amortized Cost	119,913	231,364
Gross Unrealized Gains	3,451	4,176
Gross Unrealized (Losses)	0	(3)
Fair Value	123,365
Investment securities HTM
Investment securities HTM, net	87,717	114,553
Held-to-maturity, Gross Unrealized Gains	3,353	4,260
Held-to-maturity, Gross Unrealized Loss	0	0
Held-to-maturity, Fair Value	91,070	118,813
GNMA [Member] | Commercial mortgage-related securities
Investment securities AFS
Amortized Cost	381,158	511,429
Gross Unrealized Gains	8,254	13,327
Gross Unrealized (Losses)	0	0
Fair Value	389,411
Investment securities HTM
Investment securities HTM, net	201,648	255,742
Held-to-maturity, Gross Unrealized Gains	5,611	9,218
Held-to-maturity, Gross Unrealized Loss	(21)	0
Held-to-maturity, Fair Value	207,238	264,960
FNMA / FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities
Investment securities AFS
Fair Value	94,349	22,904
FNMA / FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities
Investment securities AFS
Fair Value	$ 1,910,954	$ 1,461,241

Investment Securities, AFS an_2

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Available for Sale, Due in one year or less	$ 9,575
Available for Sale, Due after one year through five years	79,504
Available for Sale, Due after five years through ten years	357,498
Available for Sale, Due after ten years	37,624
Available for Sale, Total debt securities	484,201
Available for Sale, amortized cost	3,323,846	$ 3,028,399
Fair Value
Available for Sale, Due in one year or less	9,588
Available for Sale, Due after one year through five years	79,813
Available for Sale, Due after five years through ten years	373,906
Available for Sale, Due after ten years	41,472
Available for Sale, Total debt securities	504,778
Investment securities AFS, at fair value	$ 3,356,949	3,085,441
Available for Sale, Ratio of Fair Value to Amortized Cost	101.00%
Amortized Cost
Held to Maturity, Due in one year or less	$ 35,299
Held to Maturity, Due after one year through five years	47,810
Held to Maturity, Due after five years through ten years	179,382
Held to Maturity, Due after ten years	1,193,970
Held to Maturity, Total Debt Securities	1,456,461
Held to Maturity, Amortized Cost	1,857,150	1,879,005
Fair Value
Held to Maturity, Due in one year or less	35,587
Held to Maturity, Due after one year through five years	49,383
Held to Maturity, Due after five years through ten years	188,263
Held to Maturity, Due after ten years	1,289,186
Held to Maturity, Securities, Debt Securities	1,562,420
Held to Maturity, Total debt securities at fair value	$ 1,972,541	2,028,943
Held to Maturity, Ratio of Fair Value to Amortized Cost	106.20%
SBA
Amortized Cost
Available for Sale, amortized cost	$ 8,216	8,637
Fair Value
Investment securities AFS, at fair value	8,160
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
FFELP
Amortized Cost
Available for Sale, amortized cost	325,812	329,030
Fair Value
Investment securities AFS, at fair value	325,933
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
FNMA/FHLMC | Residential Related Securities
Amortized Cost
Available for Sale, amortized cost	1,910,644	1,448,806
Fair Value
Investment securities AFS, at fair value	1,910,954
Amortized Cost
Held to Maturity, Amortized Cost	47,480	54,599
Fair Value
Held to Maturity, Total debt securities at fair value	49,951	57,490
FNMA/FHLMC | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost	93,902	19,654
Fair Value
Investment securities AFS, at fair value	94,349
Amortized Cost
Held to Maturity, Amortized Cost	63,844	11,211
Fair Value
Held to Maturity, Total debt securities at fair value	61,863	11,211
GNMA | Residential Related Securities
Amortized Cost
Available for Sale, amortized cost	119,913	231,364
Fair Value
Investment securities AFS, at fair value	123,365
Amortized Cost
Held to Maturity, Amortized Cost	87,717	114,553
Fair Value
Held to Maturity, Total debt securities at fair value	91,070	118,813
GNMA | Commercial mortgage-related securities
Amortized Cost
Available for Sale, amortized cost	381,158	511,429
Fair Value
Investment securities AFS, at fair value	389,411
Amortized Cost
Held to Maturity, Amortized Cost	201,648	255,742
Fair Value
Held to Maturity, Total debt securities at fair value	$ 207,238	$ 264,960

Investment Securities, HTM Cred

Investment Securities, HTM Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	$ 1,857,150	$ 1,879,005
Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	193
US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	1,000	999
US Treasury Securities | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0
Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	1,455,462	1,441,900
Obligations of state and political subdivisions (municipal securities) | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	193
FNMA / FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	47,480	54,599
FNMA / FHLMC | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0
GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	87,717	114,553
GNMA | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0
us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	63,844	11,211
us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0
GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	201,648	255,742
GNMA | Not Rated [Domain]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	984,363	1,004,357
AAA | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	1,000	999
AAA | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	582,675	567,252
AAA | FNMA / FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	47,480	54,599
AAA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	87,717	114,553
AAA | us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	63,844	11,211
AAA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	201,648	255,742
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	860,882	860,607
AA | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
AA | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	860,882	860,607
AA | FNMA / FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
AA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
AA | us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
AA | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	11,711	14,041
A | US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
A | Obligations of state and political subdivisions (municipal securities)
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	11,711	14,041
A | FNMA / FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
A | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
A | us-Federal Home Loan Mortgage Corporation Certificates And Obligations (FHLMC) And Federal National Mortgage Association Certificates And Obligations (FNMA), Commercial
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	0	0
A | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities HTM, net	$ 0	$ 0

Investment Securities Gain_Loss

Investment Securities Gain/Loss Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Gross gains on AFS securities	$ 36	$ 6,198
Gross (losses) on AFS securities	(75)	(80)
Investment securities gains (losses), net	(39)	6,118
Proceeds from sales of investment securities	$ 51,295	$ 365,239

Investment Securities, AFS an_3

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2021USD ($)security	Dec. 31, 2020USD ($)security
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (8,171)	$ (685)
Unrealized losses on available for sale securities, 12 months or more	(1,611)	(2,885)
Total unrealized losses on available for sale securities	(9,782)	(3,570)
Fair value of unrealized losses on available for sale securities, less than 12 months	898,632	192,720
Fair value of unrealized losses on available for sale securities, 12 months or more	149,402	178,681
Total fair value of unrealized losses on available for sale securities	$ 1,048,033	$ 371,400
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	35	27
Available for sale, number of securities, 12 months or more | security	29	16
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (3,154)	$ 0
Unrealized losses on held to maturity securities, 12 months or more	0	0
Total unrealized losses on held to maturity securities	$ (3,154)	$ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	0	0
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 126,218	$ 325
Fair value of unrealized losses on held to maturity securities, 12 months or more	0	0
Total fair value of unrealized losses on held to maturity securities	$ 126,218	$ 325
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	41	1
SBA
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (53)
Unrealized losses on available for sale securities, 12 months or more	(57)	0
Total unrealized losses on available for sale securities	(57)	(53)
Fair value of unrealized losses on available for sale securities, less than 12 months	0	8,379
Fair value of unrealized losses on available for sale securities, 12 months or more	7,750	0
Total fair value of unrealized losses on available for sale securities	$ 7,750	$ 8,379
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	0	14
Available for sale, number of securities, 12 months or more | security	14	0
Obligations of state and political subdivisions (municipal securities)
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ 0
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	0
Fair value of unrealized losses on available for sale securities, less than 12 months	910
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	$ 910
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1
Available for sale, number of securities, 12 months or more | security	0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (994)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(994)
Fair value of unrealized losses on held to maturity securities, less than 12 months	62,908
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 62,908
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	33
Obligations of state and political subdivisions (municipal securities) | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
FFELP
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (129)
Unrealized losses on available for sale securities, 12 months or more	(1,554)	(2,885)
Total unrealized losses on available for sale securities	(1,554)	(3,013)
Fair value of unrealized losses on available for sale securities, less than 12 months	0	9,267
Fair value of unrealized losses on available for sale securities, 12 months or more	141,652	178,681
Total fair value of unrealized losses on available for sale securities	$ 141,652	$ 187,948
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	0	1
Available for sale, number of securities, 12 months or more | security	15	16
Other Debt securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months		$ 0
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		0
Fair value of unrealized losses on available for sale securities, less than 12 months		2,000
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		$ 2,000
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security		2
Available for sale, number of securities, 12 months or more | security		0
US Treasury Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (544)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(544)
Fair value of unrealized losses on available for sale securities, less than 12 months	53,693
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	$ 53,693
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	5
Available for sale, number of securities, 12 months or more | security	0
Agency Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (96)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(96)
Fair value of unrealized losses on available for sale securities, less than 12 months	14,904
Fair value of unrealized losses on available for sale securities, 12 months or more	0
Total fair value of unrealized losses on available for sale securities	$ 14,904
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1
Available for sale, number of securities, 12 months or more | security	0
FNMA/FHLMC | Residential Related Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (5,647)	$ (500)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(5,647)	(500)
Fair value of unrealized losses on available for sale securities, less than 12 months	756,359	163,002
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 756,359	$ 163,002
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	24	7
Available for sale, number of securities, 12 months or more | security	0	0
FNMA/FHLMC | Commercial mortgage-related securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ (1,883)
Unrealized losses on available for sale securities, 12 months or more	0
Total unrealized losses on available for sale securities	(1,883)
Fair value of unrealized losses on available for sale securities, less than 12 months	72,435
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	$ 72,435
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	2
Available for sale, number of securities, 12 months or more | security	0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (2,138)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(2,138)
Fair value of unrealized losses on held to maturity securities, less than 12 months	41,105
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 41,105
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	6
FNMA/FHLMC | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0
GNMA | Residential Related Securities
Investment securities AFS
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (3)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	0	(3)
Fair value of unrealized losses on available for sale securities, less than 12 months	253	9,784
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 253	$ 9,784
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1	2
Available for sale, number of securities, 12 months or more | security	0	0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months		$ 0
Unrealized losses on held to maturity securities, 12 months or more		0
Total unrealized losses on held to maturity securities		0
Fair value of unrealized losses on held to maturity securities, less than 12 months		325
Fair value of unrealized losses on held to maturity securities, 12 months or more		0
Total fair value of unrealized losses on held to maturity securities		$ 325
GNMA | Residential Related Securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		1
GNMA | Residential Related Securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security		0
GNMA | Commercial mortgage-related securities
Investment securities AFS
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	78	287
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	$ 78	$ 287
Available-for-sale, Number of Securities
Available for sale, number of securities, less than 12 months | security	1	1
Available for sale, number of securities, 12 months or more | security	0	0
Investment securities HTM
Unrealized losses on held to maturity securities, less than 12 months	$ (21)
Unrealized losses on held to maturity securities, 12 months or more	0
Total unrealized losses on held to maturity securities	(21)
Fair value of unrealized losses on held to maturity securities, less than 12 months	22,205
Fair value of unrealized losses on held to maturity securities, 12 months or more	0
Total fair value of unrealized losses on held to maturity securities	$ 22,205
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, less than 12 months
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	2
GNMA | Commercial mortgage-related securities | Held to maturity, number of securities, 12 months or more
Investment securities HTM
Number of held to maturity securities in a continuous unrealized loss position | security	0

Investment Securities (Details

Investment Securities (Details Textual) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2020
Investment Securities Information [Line Items]
Debt Securities, AFS, Principal Sold		$ 281,000,000
Gain (Loss) on Sales of Mortgage Backed Securities (MBS)		$ 6,000,000
Pledged Financial Instruments, Not Separately Reported, Securities	$ 1,500,000,000			$ 1,600,000,000
Interest receivable	86,466,000			90,263,000
Debt Securities, Held-to-maturity, Nonaccrual, Interest Income	0			0
Debt Securities, Held to Maturity, Past Due	0			0
Held to maturity allowance for credit loss	(63,000)			(67,000)
Federal Home Loan Bank Stock	82,000,000			82,000,000
Federal Reserve Bank Stock	87,000,000			87,000,000
Equity securities with readily determinable fair values, Fair Value	$ 2,000,000			2,000,000
Visa Restricted Stock Owned. Total	77,996
Visa Restricted Stock Owned at Fair Value	77,000
Visa Restricted Stock Donated			42,039
Visa Restricted Stock Owned at Zero Cost		996
Equity securities	$ 14,000,000			13,000,000
First Staunton Bancshares [Member]
Investment Securities Information [Line Items]
Carrying amount of Securities Sold		$ 84,000,000
Held-to-maturity Securities [Member]
Investment Securities Information [Line Items]
Interest receivable	12,000,000			14,000,000
Available-for-sale Securities [Member]
Investment Securities Information [Line Items]
Interest receivable	8,000,000			8,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Investment Securities Information [Line Items]
Interest receivable	944,000			972,000
Federal Reserve Bank Stock [Member]
Investment Securities Information [Line Items]
Interest receivable	$ 370,000			$ 0

Loans Composition (Details)

Loans Composition (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 24,162,328	$ 24,451,724
Interest receivable	86,466	90,263
Loans and Finance Receivables [Member]
Loans and Leases Receivable Disclosure [Line Items]
Interest receivable	64,000	66,000
PPP
Loans and Leases Receivable Disclosure [Line Items]
Loans	836,566	767,757
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,664,501	7,701,422
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Loans	883,237	900,912
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	9,384,303	9,370,091
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Loans	4,260,706	4,342,584
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,882,299	1,840,417
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	6,143,004	6,183,001
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	15,527,307	15,553,091
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	7,685,218	7,878,324
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Loans	651,647	707,255
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	298,156	313,054
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 8,635,020	$ 8,898,632

Loans, Credit Quality Indicator

Loans, Credit Quality Indicator by Vintage Year (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	$ 23,745	$ 69,246
Financing Receivable, Revolving	3,087,079	3,173,996
Financing Receivable, Originated in Current Fiscal Year	1,663,836	6,590,550
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,287,678	5,127,451
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,711,270	3,189,745
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,880,788	1,937,912
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,633,471	1,770,647
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,898,205	2,661,424
Total	24,162,328	24,451,724
Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	602
Financing Receivable, Revolving	7,775	11,341
Financing Receivable, Originated in Current Fiscal Year	3,514	99,324
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	96,877	141,213
Financing Receivable, Originated Two Years before Latest Fiscal Year	170,076	98,320
Financing Receivable, Originated Three Years before Latest Fiscal Year	123,240	958
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,703	22,498
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18,360	9,911
Total	429,545	383,566
Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	21,671	27,819
Financing Receivable, Revolving	3,055,640	3,149,039
Financing Receivable, Originated in Current Fiscal Year	1,641,033	6,413,278
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,085,644	4,873,347
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,462,823	2,960,705
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,673,970	1,892,247
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,593,822	1,716,226
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,792,071	2,570,534
Total	23,305,003	23,575,376
Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,800	2,565
Financing Receivable, Revolving	23,479	13,483
Financing Receivable, Originated in Current Fiscal Year	19,279	59,116
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	87,565	51,593
Financing Receivable, Originated Two Years before Latest Fiscal Year	58,729	106,947
Financing Receivable, Originated Three Years before Latest Fiscal Year	40,720	6,038
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,761	11,426
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	27,955	33,324
Total	264,488	281,928
Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	274	38,260
Financing Receivable, Revolving	184	133
Financing Receivable, Originated in Current Fiscal Year	10	18,831
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17,592	61,298
Financing Receivable, Originated Two Years before Latest Fiscal Year	19,643	23,773
Financing Receivable, Originated Three Years before Latest Fiscal Year	42,859	38,669
Financing Receivable, Originated Four Years before Latest Fiscal Year	23,185	20,496
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	59,819	47,655
Total	163,292	210,854
Total commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	21,409	56,745
Financing Receivable, Revolving	2,401,249	2,436,370
Financing Receivable, Originated in Current Fiscal Year	1,212,394	4,390,063
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,068,409	3,610,033
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,406,483	2,547,526
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,310,939	918,783
Financing Receivable, Originated Four Years before Latest Fiscal Year	730,967	839,831
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,396,867	810,485
Total	15,527,307	15,553,091
Total commercial | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	7,298	10,272
Financing Receivable, Originated in Current Fiscal Year	3,514	99,311
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	96,757	140,803
Financing Receivable, Originated Two Years before Latest Fiscal Year	170,035	97,964
Financing Receivable, Originated Three Years before Latest Fiscal Year	123,143	813
Financing Receivable, Originated Four Years before Latest Fiscal Year	9,569	22,361
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17,565	8,562
Total	427,882	380,086
Total commercial | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	19,609	17,524
Financing Receivable, Revolving	2,372,034	2,414,537
Financing Receivable, Originated in Current Fiscal Year	1,189,673	4,216,457
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,869,571	3,359,482
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,161,950	2,325,808
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,111,718	880,708
Financing Receivable, Originated Four Years before Latest Fiscal Year	700,255	797,441
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,341,977	760,973
Total	14,747,179	14,755,405
Total commercial | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,800	2,565
Financing Receivable, Revolving	21,916	11,561
Financing Receivable, Originated in Current Fiscal Year	19,207	57,916
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	87,055	50,905
Financing Receivable, Originated Two Years before Latest Fiscal Year	58,167	106,295
Financing Receivable, Originated Three Years before Latest Fiscal Year	40,026	6,038
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,636	11,247
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	27,227	32,150
Total	260,234	276,111
Total commercial | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	36,655
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	16,379
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15,026	58,845
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,330	17,460
Financing Receivable, Originated Three Years before Latest Fiscal Year	36,052	31,224
Financing Receivable, Originated Four Years before Latest Fiscal Year	14,507	8,781
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	10,098	8,801
Total	92,012	141,490
Total commercial | PPP
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	292,213	767,757
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	544,353	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	836,566	767,757
Total commercial | PPP | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	1,642	3,988
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,434	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	5,076	3,988
Total commercial | PPP | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	281,120	745,767
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	527,971	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	809,091	745,767
Total commercial | PPP | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	9,450	18,002
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12,948	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	22,398	18,002
Total commercial | Commercial And Industrial Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,809	24,045
Financing Receivable, Revolving	2,198,196	2,194,534
Financing Receivable, Originated in Current Fiscal Year	383,045	1,417,548
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,330,929	1,509,575
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,428,343	1,292,938
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,221,448	502,962
Financing Receivable, Originated Four Years before Latest Fiscal Year	391,692	321,471
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	710,849	462,394
Total	7,664,501	7,701,422
Total commercial | Commercial And Industrial Financing Receivable [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	7,298	10,159
Financing Receivable, Originated in Current Fiscal Year	96	2,719
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,805	39,854
Financing Receivable, Originated Two Years before Latest Fiscal Year	59,502	37,042
Financing Receivable, Originated Three Years before Latest Fiscal Year	48,156	113
Financing Receivable, Originated Four Years before Latest Fiscal Year	207	215
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	185	67
Total	119,249	90,169
Total commercial | Commercial And Industrial Financing Receivable [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,009	4,628
Financing Receivable, Revolving	2,170,406	2,177,138
Financing Receivable, Originated in Current Fiscal Year	378,782	1,389,260
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,303,573	1,435,519
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,333,680	1,182,302
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,119,175	483,957
Financing Receivable, Originated Four Years before Latest Fiscal Year	389,390	305,998
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	694,910	453,734
Total	7,389,917	7,427,908
Total commercial | Commercial And Industrial Financing Receivable [Member] | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,800	2,565
Financing Receivable, Revolving	20,492	7,237
Financing Receivable, Originated in Current Fiscal Year	4,166	19,331
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	17,407	28,413
Financing Receivable, Originated Two Years before Latest Fiscal Year	34,437	56,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	37,587	2,269
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,761	6,477
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,294	1,179
Total	122,143	121,487
Total commercial | Commercial And Industrial Financing Receivable [Member] | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	16,852
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	6,238
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,143	5,789
Financing Receivable, Originated Two Years before Latest Fiscal Year	725	17,014
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,530	16,623
Financing Receivable, Originated Four Years before Latest Fiscal Year	334	8,781
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	9,461	7,414
Total	33,192	61,859
Total commercial | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	11,868	1,150
Financing Receivable, Revolving	21,538	21,621
Financing Receivable, Originated in Current Fiscal Year	59,656	191,847
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	183,520	221,107
Financing Receivable, Originated Two Years before Latest Fiscal Year	213,178	128,660
Financing Receivable, Originated Three Years before Latest Fiscal Year	129,123	102,012
Financing Receivable, Originated Four Years before Latest Fiscal Year	83,479	152,067
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	192,743	83,598
Total	883,237	900,912
Total commercial | Commercial real estate — owner occupied | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	113
Financing Receivable, Originated in Current Fiscal Year	0	1,882
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,014	3,122
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,080	300
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	658
Financing Receivable, Originated Four Years before Latest Fiscal Year	424	264
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	260	0
Total	7,777	6,339
Total commercial | Commercial real estate — owner occupied | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	11,868	1,150
Financing Receivable, Revolving	20,916	18,022
Financing Receivable, Originated in Current Fiscal Year	59,551	185,861
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	174,514	209,069
Financing Receivable, Originated Two Years before Latest Fiscal Year	210,032	128,360
Financing Receivable, Originated Three Years before Latest Fiscal Year	128,471	99,546
Financing Receivable, Originated Four Years before Latest Fiscal Year	81,020	147,366
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	184,983	79,111
Total	859,487	867,335
Total commercial | Commercial real estate — owner occupied | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	622	3,486
Financing Receivable, Originated in Current Fiscal Year	105	4,104
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,992	8,916
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,066	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	652	1,490
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,035	4,437
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,493	3,747
Total	15,965	26,179
Total commercial | Commercial real estate — owner occupied | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	318
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7	740
Total	7	1,058
Total commercial | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	15,677	25,195
Financing Receivable, Revolving	2,219,734	2,216,154
Financing Receivable, Originated in Current Fiscal Year	734,913	2,377,152
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,058,802	1,730,682
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,641,521	1,421,598
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,350,571	604,974
Financing Receivable, Originated Four Years before Latest Fiscal Year	475,170	473,539
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	903,592	545,992
Total	9,384,303	9,370,091
Total commercial | Commercial and business lending | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	7,298	10,272
Financing Receivable, Originated in Current Fiscal Year	1,738	8,589
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12,253	42,976
Financing Receivable, Originated Two Years before Latest Fiscal Year	61,582	37,342
Financing Receivable, Originated Three Years before Latest Fiscal Year	48,156	771
Financing Receivable, Originated Four Years before Latest Fiscal Year	631	479
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	444	67
Total	132,102	100,496
Total commercial | Commercial and business lending | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	13,877	5,778
Financing Receivable, Revolving	2,191,322	2,195,160
Financing Receivable, Originated in Current Fiscal Year	719,454	2,320,888
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,006,059	1,644,588
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,543,712	1,310,662
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,247,646	583,503
Financing Receivable, Originated Four Years before Latest Fiscal Year	470,410	453,364
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	879,893	532,845
Total	9,058,495	9,041,009
Total commercial | Commercial and business lending | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,800	2,565
Financing Receivable, Revolving	21,114	10,723
Financing Receivable, Originated in Current Fiscal Year	13,721	41,437
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	34,347	37,329
Financing Receivable, Originated Two Years before Latest Fiscal Year	35,502	56,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	38,238	3,759
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,796	10,915
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13,786	4,926
Total	160,506	165,668
Total commercial | Commercial and business lending | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	16,852
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	6,238
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	6,143	5,789
Financing Receivable, Originated Two Years before Latest Fiscal Year	725	17,014
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,530	16,941
Financing Receivable, Originated Four Years before Latest Fiscal Year	334	8,781
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	9,468	8,154
Total	33,200	62,917
Total commercial | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	30,774
Financing Receivable, Revolving	154,649	172,335
Financing Receivable, Originated in Current Fiscal Year	351,662	1,366,364
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,252,057	1,140,297
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,118,634	763,933
Financing Receivable, Originated Three Years before Latest Fiscal Year	673,414	288,533
Financing Receivable, Originated Four Years before Latest Fiscal Year	234,276	363,779
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	476,014	247,343
Total	4,260,706	4,342,584
Total commercial | Commercial real estate — investor | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	1,776	90,235
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	83,975	97,333
Financing Receivable, Originated Two Years before Latest Fiscal Year	104,806	12,339
Financing Receivable, Originated Three Years before Latest Fiscal Year	16,161	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,897	21,882
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17,121	8,465
Total	232,735	230,254
Total commercial | Commercial real estate — investor | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	10,971
Financing Receivable, Revolving	153,847	171,497
Financing Receivable, Originated in Current Fiscal Year	344,412	1,249,644
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,106,623	976,332
Financing Receivable, Originated Two Years before Latest Fiscal Year	989,271	720,237
Financing Receivable, Originated Three Years before Latest Fiscal Year	635,944	271,987
Financing Receivable, Originated Four Years before Latest Fiscal Year	208,367	341,658
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	445,269	211,360
Total	3,883,733	3,942,714
Total commercial | Commercial real estate — investor | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	802	838
Financing Receivable, Originated in Current Fiscal Year	5,473	16,343
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	52,576	13,575
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,952	30,911
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,787	2,279
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,840	239
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13,321	27,209
Total	85,752	91,396
Total commercial | Commercial real estate — investor | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	19,803
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	10,141
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,883	53,056
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,605	446
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,522	14,267
Financing Receivable, Originated Four Years before Latest Fiscal Year	14,173	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	302	309
Total	58,485	78,220
Total commercial | Real Estate Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5,732	776
Financing Receivable, Revolving	26,865	47,880
Financing Receivable, Originated in Current Fiscal Year	125,819	646,547
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	757,550	739,055
Financing Receivable, Originated Two Years before Latest Fiscal Year	646,328	361,996
Financing Receivable, Originated Three Years before Latest Fiscal Year	286,953	25,277
Financing Receivable, Originated Four Years before Latest Fiscal Year	21,520	2,513
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17,262	17,150
Total	1,882,299	1,840,417
Total commercial | Real Estate Construction | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	487
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	529	494
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,648	48,283
Financing Receivable, Originated Three Years before Latest Fiscal Year	58,826	42
Financing Receivable, Originated Four Years before Latest Fiscal Year	42	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	30
Total	63,045	49,336
Total commercial | Real Estate Construction | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5,732	776
Financing Receivable, Revolving	26,865	47,880
Financing Receivable, Originated in Current Fiscal Year	125,807	645,925
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	756,890	738,561
Financing Receivable, Originated Two Years before Latest Fiscal Year	628,967	294,910
Financing Receivable, Originated Three Years before Latest Fiscal Year	228,127	25,219
Financing Receivable, Originated Four Years before Latest Fiscal Year	21,478	2,420
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	16,815	16,768
Total	1,804,950	1,771,682
Total commercial | Real Estate Construction | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	12	135
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	131	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	13,713	18,803
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	93
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	119	15
Total	13,977	19,046
Total commercial | Real Estate Construction | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	16
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	327	338
Total	327	353
Total commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5,732	31,549
Financing Receivable, Revolving	181,515	220,215
Financing Receivable, Originated in Current Fiscal Year	477,481	2,012,911
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,009,607	1,879,352
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,764,962	1,125,929
Financing Receivable, Originated Three Years before Latest Fiscal Year	960,368	313,810
Financing Receivable, Originated Four Years before Latest Fiscal Year	255,796	366,292
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	493,275	264,493
Total	6,143,004	6,183,001
Total commercial | Commercial Real Estate | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	1,776	90,722
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	84,504	97,827
Financing Receivable, Originated Two Years before Latest Fiscal Year	108,453	60,622
Financing Receivable, Originated Three Years before Latest Fiscal Year	74,987	42
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,939	21,882
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	17,121	8,494
Total	295,780	279,590
Total commercial | Commercial Real Estate | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	5,732	11,746
Financing Receivable, Revolving	180,712	219,377
Financing Receivable, Originated in Current Fiscal Year	470,219	1,895,569
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,863,513	1,714,893
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,618,239	1,015,146
Financing Receivable, Originated Three Years before Latest Fiscal Year	864,072	297,205
Financing Receivable, Originated Four Years before Latest Fiscal Year	229,845	344,078
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	462,084	228,127
Total	5,688,683	5,714,396
Total commercial | Commercial Real Estate | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	802	838
Financing Receivable, Originated in Current Fiscal Year	5,486	16,479
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	52,708	13,575
Financing Receivable, Originated Two Years before Latest Fiscal Year	22,665	49,714
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,787	2,279
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,840	332
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	13,440	27,224
Total	99,728	110,442
Total commercial | Commercial Real Estate | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	19,803
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	10,141
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,883	53,056
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,605	446
Financing Receivable, Originated Three Years before Latest Fiscal Year	19,522	14,283
Financing Receivable, Originated Four Years before Latest Fiscal Year	14,173	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	630	647
Total	58,813	78,573
Total consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,336	12,501
Financing Receivable, Revolving	685,830	737,626
Financing Receivable, Originated in Current Fiscal Year	451,442	2,200,487
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,219,269	1,517,417
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,304,787	642,218
Financing Receivable, Originated Three Years before Latest Fiscal Year	569,850	1,019,128
Financing Receivable, Originated Four Years before Latest Fiscal Year	902,504	930,816
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,501,338	1,850,939
Total	8,635,020	8,898,632
Total consumer | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	602
Financing Receivable, Revolving	477	1,069
Financing Receivable, Originated in Current Fiscal Year	0	13
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	121	410
Financing Receivable, Originated Two Years before Latest Fiscal Year	40	356
Financing Receivable, Originated Three Years before Latest Fiscal Year	96	145
Financing Receivable, Originated Four Years before Latest Fiscal Year	133	137
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	795	1,349
Total	1,663	3,480
Total consumer | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,062	10,294
Financing Receivable, Revolving	683,606	734,502
Financing Receivable, Originated in Current Fiscal Year	451,360	2,196,822
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,216,072	1,513,865
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,300,872	634,897
Financing Receivable, Originated Three Years before Latest Fiscal Year	562,252	1,011,539
Financing Receivable, Originated Four Years before Latest Fiscal Year	893,567	918,785
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,450,094	1,809,561
Total	8,557,824	8,819,971
Total consumer | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	1,563	1,922
Financing Receivable, Originated in Current Fiscal Year	72	1,200
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	510	689
Financing Receivable, Originated Two Years before Latest Fiscal Year	561	652
Financing Receivable, Originated Three Years before Latest Fiscal Year	694	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	126	179
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	728	1,174
Total	4,254	5,817
Total consumer | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	274	1,605
Financing Receivable, Revolving	184	133
Financing Receivable, Originated in Current Fiscal Year	10	2,452
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,566	2,454
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,313	6,313
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,807	7,445
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,678	11,714
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	49,722	38,854
Total	71,280	69,364
Total consumer | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	449,452	2,187,918
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,208,058	1,493,903
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,284,324	621,983
Financing Receivable, Originated Three Years before Latest Fiscal Year	552,885	1,005,290
Financing Receivable, Originated Four Years before Latest Fiscal Year	890,386	923,105
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,300,113	1,646,124
Total	7,685,218	7,878,324
Total consumer | Residential mortgage | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	121	355
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	330
Financing Receivable, Originated Three Years before Latest Fiscal Year	37	102
Financing Receivable, Originated Four Years before Latest Fiscal Year	133	126
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	525	537
Total	816	1,450
Total consumer | Residential mortgage | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	449,381	2,185,240
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,205,662	1,490,589
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,280,604	615,118
Financing Receivable, Originated Three Years before Latest Fiscal Year	545,743	998,072
Financing Receivable, Originated Four Years before Latest Fiscal Year	881,884	911,797
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,257,349	1,612,971
Total	7,620,622	7,813,788
Total consumer | Residential mortgage | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	72	1,200
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	510	689
Financing Receivable, Originated Two Years before Latest Fiscal Year	561	652
Financing Receivable, Originated Three Years before Latest Fiscal Year	674	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	126	179
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	582	1,028
Total	2,524	3,749
Total consumer | Residential mortgage | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	1,478
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,765	2,271
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,160	5,882
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,431	7,116
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,243	11,003
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	41,657	31,587
Total	61,256	59,337
Total consumer | Home Equity Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	2,153	12,421
Financing Receivable, Revolving	528,455	572,041
Financing Receivable, Originated in Current Fiscal Year	81	3,022
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,866	13,141
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,713	16,216
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,981	11,952
Financing Receivable, Originated Four Years before Latest Fiscal Year	10,745	6,518
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	83,805	84,364
Total	651,647	707,255
Total consumer | Home Equity Loan [Member] | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	596
Financing Receivable, Revolving	25	631
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	39
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	14
Financing Receivable, Originated Three Years before Latest Fiscal Year	60	39
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	265	804
Total	350	1,532
Total consumer | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	1,891	10,224
Financing Receivable, Revolving	526,777	569,389
Financing Receivable, Originated in Current Fiscal Year	71	2,057
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,080	12,968
Financing Receivable, Originated Two Years before Latest Fiscal Year	11,595	15,792
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,535	11,594
Financing Receivable, Originated Four Years before Latest Fiscal Year	10,333	5,803
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	75,385	76,165
Total	639,776	693,767
Total consumer | Home Equity Loan [Member] | Potential Problem [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	1,563	1,922
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	20	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	146	146
Total	1,729	2,068
Total consumer | Home Equity Loan [Member] | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	262	1,600
Financing Receivable, Revolving	91	100
Financing Receivable, Originated in Current Fiscal Year	10	965
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	786	134
Financing Receivable, Originated Two Years before Latest Fiscal Year	118	410
Financing Receivable, Originated Three Years before Latest Fiscal Year	366	319
Financing Receivable, Originated Four Years before Latest Fiscal Year	413	711
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	8,008	7,249
Total	9,792	9,888
Total consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	183	81
Financing Receivable, Revolving	157,375	165,585
Financing Receivable, Originated in Current Fiscal Year	1,908	9,547
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,345	10,374
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,749	4,019
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,984	1,886
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,374	1,192
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	117,421	120,451
Total	298,156	313,054
Total consumer | Other consumer | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	5
Financing Receivable, Revolving	452	438
Financing Receivable, Originated in Current Fiscal Year	0	13
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	16
Financing Receivable, Originated Two Years before Latest Fiscal Year	40	11
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	7
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	5	8
Total	497	498
Total consumer | Other consumer | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	171	70
Financing Receivable, Revolving	156,829	165,114
Financing Receivable, Originated in Current Fiscal Year	1,908	9,525
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	8,330	10,309
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,674	3,987
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,974	1,872
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,351	1,185
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	117,360	120,425
Total	297,427	312,416
Total consumer | Other consumer | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	13	5
Financing Receivable, Revolving	93	33
Financing Receivable, Originated in Current Fiscal Year	0	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	15	49
Financing Receivable, Originated Two Years before Latest Fiscal Year	35	21
Financing Receivable, Originated Three Years before Latest Fiscal Year	10	10
Financing Receivable, Originated Four Years before Latest Fiscal Year	23	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	56	18
Total	$ 231	$ 140

Loans Credit Quality Indicator

Loans Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 24,162,328	$ 24,451,724
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,664,501	7,701,422
Commercial real estate — owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	883,237	900,912
Commercial and business lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	9,384,303	9,370,091
Commercial real estate — investor
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	4,260,706	4,342,584
Real estate construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,882,299	1,840,417
Commercial real estate lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	6,143,004	6,183,001
Total commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	15,527,307	15,553,091
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	7,685,218	7,878,324
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	651,647	707,255
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	298,156	313,054
Total consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 8,635,020	$ 8,898,632

Loans Past Due Status (Details)

Loans Past Due Status (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Summarized details of Loans
Current(a)	$ 23,982,264	$ 24,202,209
Nonaccrual(b)(c)	163,292	210,854
Loans and Leases Receivable, Net of Deferred Income, Total	24,162,328	24,451,724
Nonaccrual Loans, Current Portion	$ 99,000	$ 128,000
Percent of current nonaccrual loans	61.00%	61.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	16,000	28,000
30-59 Days Past Due
Summarized details of Loans
Total Past Due	13,597	18,077
60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,500	18,985
90+ Days Past Due
Summarized details of Loans
Total Past Due	1,675	1,598
PPP
Summarized details of Loans
Current(a)	836,566	767,757
Nonaccrual(b)(c)	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	836,566	767,757
PPP | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0
PPP | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0
PPP | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Commercial and industrial
Summarized details of Loans
Current(a)	7,630,593	7,633,269
Nonaccrual(b)(c)	33,192	61,859
Loans and Leases Receivable, Net of Deferred Income, Total	7,664,501	7,701,422
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	444	2,819
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	82	3,300
Commercial and industrial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	190	175
Commercial real estate — owner occupied
Summarized details of Loans
Current(a)	883,229	899,480
Nonaccrual(b)(c)	7	1,058
Loans and Leases Receivable, Net of Deferred Income, Total	883,237	900,912
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	158
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	215
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(a)	9,350,388	9,300,506
Nonaccrual(b)(c)	33,200	62,917
Loans and Leases Receivable, Net of Deferred Income, Total	9,384,303	9,370,091
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	444	2,977
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	82	3,516
Commercial and business lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	190	175
Commercial real estate — investor
Summarized details of Loans
Current(a)	4,196,221	4,251,571
Nonaccrual(b)(c)	58,485	78,220
Loans and Leases Receivable, Net of Deferred Income, Total	4,260,706	4,342,584
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	5,999	1,024
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	11,769
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(a)	1,880,995	1,839,073
Nonaccrual(b)(c)	327	353
Loans and Leases Receivable, Net of Deferred Income, Total	1,882,299	1,840,417
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	977	991
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0
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(a)	6,077,216	6,090,644
Nonaccrual(b)(c)	58,813	78,573
Loans and Leases Receivable, Net of Deferred Income, Total	6,143,004	6,183,001
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,976	2,015
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	11,769
Commercial real estate lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Total commercial
Summarized details of Loans
Current(a)	15,427,603	15,391,150
Nonaccrual(b)(c)	92,012	141,490
Loans and Leases Receivable, Net of Deferred Income, Total	15,527,307	15,553,091
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	7,420	4,992
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	82	15,284
Total commercial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	190	175
Residential mortgage
Summarized details of Loans
Current(a)	7,619,602	7,808,294
Nonaccrual(b)(c)	61,256	59,337
Loans and Leases Receivable, Net of Deferred Income, Total	7,685,218	7,878,324
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,494	8,975
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	479	1,410
Residential mortgage | 90+ Days Past Due
Summarized details of Loans
Total Past Due	387	308
Home equity
Summarized details of Loans
Current(a)	639,503	692,565
Nonaccrual(b)(c)	9,792	9,888
Loans and Leases Receivable, Net of Deferred Income, Total	651,647	707,255
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,002	3,071
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	350	1,731
Home equity | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0
Other consumer
Summarized details of Loans
Current(a)	295,556	310,200
Nonaccrual(b)(c)	231	140
Loans and Leases Receivable, Net of Deferred Income, Total	298,156	313,054
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	681	1,039
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	589	560
Other consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	1,098	1,115
Total consumer
Summarized details of Loans
Current(a)	8,554,661	8,811,060
Nonaccrual(b)(c)	71,280	69,364
Loans and Leases Receivable, Net of Deferred Income, Total	8,635,020	8,898,632
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,177	13,085
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,417	3,701
Total consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	$ 1,485	$ 1,423

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	$ 40,820	$ 52,092
Nonaccrual Restructured Loans(a)	17,624	20,190
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	11,985	12,713
Nonaccrual Restructured Loans(a)	2,114	6,967
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,488	1,711
Nonaccrual Restructured Loans(a)	0	0
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	13,627	26,435
Nonaccrual Restructured Loans(a)	220	225
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	256	260
Nonaccrual Restructured Loans(a)	109	111
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	10,462	7,825
Nonaccrual Restructured Loans(a)	13,537	11,509
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,929	1,957
Nonaccrual Restructured Loans(a)	1,644	1,379
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Performing Restructured Loans	1,073	1,191
Nonaccrual Restructured Loans(a)	$ 0	$ 0

Loans, Loans Modified in a Trou

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	25	30
Recorded Investment(a)	$ 5,999	$ 4,899
Unpaid Principal Balance(b)	$ 6,025	$ 6,175
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 48
Unpaid Principal Balance(b)	$ 0	$ 48
Commercial real estate — owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 290
Unpaid Principal Balance(b)	$ 0	$ 321
Commercial real estate — investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	4	1
Recorded Investment(a)	$ 1,693	$ 570
Unpaid Principal Balance(b)	$ 1,693	$ 1,740
Real estate construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	1
Recorded Investment(a)	$ 0	$ 122
Unpaid Principal Balance(b)	$ 0	$ 122
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	20	18
Recorded Investment(a)	$ 3,876	$ 3,592
Unpaid Principal Balance(b)	$ 3,902	$ 3,668
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	8
Recorded Investment(a)	$ 430	$ 277
Unpaid Principal Balance(b)	$ 430	$ 277

Loans, Troubled Debt Restruct_2

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan	Dec. 31, 2020USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	5
Recorded Investment	$ 97	$ 476
Ytd Restructured Loans Still On Nonaccrual	3,000
Possible Liquidity Issues [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 49,000		$ 68,000
Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	3
Recorded Investment	$ 97	$ 388
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	0	2
Recorded Investment	$ 0	$ 88

Loans, Changes in the Allowance

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 47,776	$ 21,907	$ 21,907
Off-Balance Sheet, Credit Loss, Liability	47,776	21,907	47,776	$ 50,776	$ 47,776
Provision for credit losses	3,000		7,000
Balance at end of period	50,776		47,776
Allowance for credit losses on loans
Provision for credit losses	(23,004)	53,001
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	383,702
Balance at end of period	352,938		383,702
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total allowance for loan losses	383,702		383,702	352,938	383,702
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				24,162,328	24,451,724
Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						$ 40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,690
PPP
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				836,566	767,757
Commercial and industrial
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				7,664,501	7,701,422
Commercial real estate — owner occupied
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				883,237	900,912
Commercial and business lending
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				9,384,303	9,370,091
Commercial real estate — investor
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				4,260,706	4,342,584
Real estate construction
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				1,882,299	1,840,417
Commercial real estate lending
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				6,143,004	6,183,001
Total commercial
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				15,527,307	15,553,091
Home equity
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				651,647	707,255
Total consumer
Loans [Abstract]
Loans and Leases Receivable, Net of Deferred Income, Total				8,635,020	8,898,632
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	383,702	201,371	201,371
Financing Receivable, Allowance for Credit Loss	352,938	201,371	201,371	352,938	383,702
Recoveries	8,410		11,422
Net Charge offs	(4,764)		(100,631)
Gross up of allowance for PCD loans at acquisition			3,504
Provision for credit losses	(26,000)		164,457
Balance at end of period	352,938		383,702
Allowance for credit losses on loans
Recoveries	8,410		11,422
Net Charge offs	(4,764)		(100,631)
Gross up of allowance for PCD loans at acquisition			3,504
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(13,174)		(112,053)
Net Charge offs	(4,764)		(100,631)
Allowance for Loan Losses [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						313,828
Allowance for Loan Losses [Member] | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			2,543
Allowance for Loan Losses [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						112,457
Allowance for Loan Losses [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	531	0	0
Financing Receivable, Allowance for Credit Loss	607	0	0	607	531
Recoveries	0		0
Net Charge offs	0		0
Gross up of allowance for PCD loans at acquisition			0
Provision for credit losses	76		531
Balance at end of period	607		531
Allowance for credit losses on loans
Recoveries	0		0
Net Charge offs	0		0
Gross up of allowance for PCD loans at acquisition			0
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	0		0
Net Charge offs	0		0
Allowance for Loan Losses [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						0
Allowance for Loan Losses [Member] | PPP | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			0
Allowance for Loan Losses [Member] | PPP | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						0
Allowance for Loan Losses [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	142,793	91,133	91,133
Financing Receivable, Allowance for Credit Loss	142,793	91,133	142,793	124,707	142,793
Recoveries	4,490		7,004
Net Charge offs	1,367		(73,316)
Gross up of allowance for PCD loans at acquisition			293
Provision for credit losses	(19,453)		71,355
Balance at end of period	124,707		142,793
Allowance for credit losses on loans
Recoveries	4,490		7,004
Net Charge offs	1,367		(73,316)
Gross up of allowance for PCD loans at acquisition			293
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(3,123)		(80,320)
Net Charge offs	1,367		(73,316)
Allowance for Loan Losses [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						144,052
Allowance for Loan Losses [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			408
Allowance for Loan Losses [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						52,919
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	11,274	10,284	10,284
Financing Receivable, Allowance for Credit Loss	11,274	10,284	11,274	11,786	11,274
Recoveries	4		147
Net Charge offs	4		(272)
Gross up of allowance for PCD loans at acquisition			890
Provision for credit losses	508		1,967
Balance at end of period	11,786		11,274
Allowance for credit losses on loans
Recoveries	4		147
Net Charge offs	4		(272)
Gross up of allowance for PCD loans at acquisition			890
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	0		(419)
Net Charge offs	4		(272)
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						8,433
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			255
Allowance for Loan Losses [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						(1,851)
Allowance for Loan Losses [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	154,598	101,417	101,417
Financing Receivable, Allowance for Credit Loss	137,099	101,417	101,417	137,099	154,598
Recoveries	4,494		7,151
Net Charge offs	1,370		(73,588)
Gross up of allowance for PCD loans at acquisition			1,183
Provision for credit losses	(18,869)		73,853
Balance at end of period	137,099		154,598
Allowance for credit losses on loans
Recoveries	4,494		7,151
Net Charge offs	1,370		(73,588)
Gross up of allowance for PCD loans at acquisition			1,183
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(3,123)		(80,739)
Net Charge offs	1,370		(73,588)
Allowance for Loan Losses [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						152,485
Allowance for Loan Losses [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			663
Allowance for Loan Losses [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						51,068
Allowance for Loan Losses [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	93,435	40,514	40,514
Financing Receivable, Allowance for Credit Loss	93,435	40,514	93,435	89,243	93,435
Recoveries	2,854		643
Net Charge offs	(5,886)		(22,277)
Gross up of allowance for PCD loans at acquisition			753
Provision for credit losses	1,694		71,933
Balance at end of period	89,243		93,435
Allowance for credit losses on loans
Recoveries	2,854		643
Net Charge offs	(5,886)		(22,277)
Gross up of allowance for PCD loans at acquisition			753
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(8,739)		(22,920)
Net Charge offs	(5,886)		(22,277)
Allowance for Loan Losses [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						42,555
Allowance for Loan Losses [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			472
Allowance for Loan Losses [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						2,041
Allowance for Loan Losses [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	59,193	24,915	24,915
Financing Receivable, Allowance for Credit Loss	54,243	24,915	24,915	54,243	59,193
Recoveries	31		49
Net Charge offs	29		31
Gross up of allowance for PCD loans at acquisition			435
Provision for credit losses	(4,979)		25,854
Balance at end of period	54,243		59,193
Allowance for credit losses on loans
Recoveries	31		49
Net Charge offs	29		31
Gross up of allowance for PCD loans at acquisition			435
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(3)		(19)
Net Charge offs	29		31
Allowance for Loan Losses [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						32,382
Allowance for Loan Losses [Member] | Real estate construction | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			492
Allowance for Loan Losses [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						7,467
Allowance for Loan Losses [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	152,629	65,428	65,428
Financing Receivable, Allowance for Credit Loss	152,629	65,428	152,629	143,486	152,629
Recoveries	2,885		692
Net Charge offs	(5,857)		(22,246)
Gross up of allowance for PCD loans at acquisition			1,188
Provision for credit losses	(3,286)		97,787
Balance at end of period	143,486		152,629
Allowance for credit losses on loans
Recoveries	2,885		692
Net Charge offs	(5,857)		(22,246)
Gross up of allowance for PCD loans at acquisition			1,188
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(8,742)		(22,938)
Net Charge offs	(5,857)		(22,246)
Allowance for Loan Losses [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						74,937
Allowance for Loan Losses [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			964
Allowance for Loan Losses [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						9,508
Allowance for Loan Losses [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	307,226	166,846	166,846
Financing Receivable, Allowance for Credit Loss	280,585	166,846	166,846	280,585	307,226
Recoveries	7,379		7,844
Net Charge offs	(4,487)		(95,834)
Gross up of allowance for PCD loans at acquisition			2,371
Provision for credit losses	(22,155)		171,641
Balance at end of period	280,585		307,226
Allowance for credit losses on loans
Recoveries	7,379		7,844
Net Charge offs	(4,487)		(95,834)
Gross up of allowance for PCD loans at acquisition			2,371
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(11,865)		(103,677)
Net Charge offs	(4,487)		(95,834)
Allowance for Loan Losses [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						227,422
Allowance for Loan Losses [Member] | Total commercial | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			1,627
Allowance for Loan Losses [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						60,576
Allowance for Loan Losses [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	42,996	16,960	16,960
Financing Receivable, Allowance for Credit Loss	45,215	16,960	16,960	45,215	42,996
Recoveries	134		500
Net Charge offs	(109)		(1,367)
Gross up of allowance for PCD loans at acquisition			651
Provision for credit losses	2,328		(6,864)
Balance at end of period	45,215		42,996
Allowance for credit losses on loans
Recoveries	134		500
Net Charge offs	(109)		(1,367)
Gross up of allowance for PCD loans at acquisition			651
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(243)		(1,867)
Net Charge offs	(109)		(1,367)
Allowance for Loan Losses [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						50,175
Allowance for Loan Losses [Member] | Residential mortgage | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			403
Allowance for Loan Losses [Member] | Residential mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						33,215
Allowance for Loan Losses [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	18,849	10,926	10,926
Financing Receivable, Allowance for Credit Loss	16,371	10,926	10,926	16,371	18,849
Recoveries	583		1,978
Net Charge offs	344		259
Gross up of allowance for PCD loans at acquisition			422
Provision for credit losses	(2,822)		(4,781)
Balance at end of period	16,371		18,849
Allowance for credit losses on loans
Recoveries	583		1,978
Net Charge offs	344		259
Gross up of allowance for PCD loans at acquisition			422
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(238)		(1,719)
Net Charge offs	344		259
Allowance for Loan Losses [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						22,575
Allowance for Loan Losses [Member] | Home equity | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			374
Allowance for Loan Losses [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						11,649
Allowance for Loan Losses [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	14,630	6,639	6,639
Financing Receivable, Allowance for Credit Loss	14,630	6,639	14,630	10,767	14,630
Recoveries	315		1,101
Net Charge offs	(511)		(3,689)
Gross up of allowance for PCD loans at acquisition			61
Provision for credit losses	(3,351)		4,462
Balance at end of period	10,767		14,630
Allowance for credit losses on loans
Recoveries	315		1,101
Net Charge offs	(511)		(3,689)
Gross up of allowance for PCD loans at acquisition			61
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(827)		(4,790)
Net Charge offs	(511)		(3,689)
Allowance for Loan Losses [Member] | Other consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						13,655
Allowance for Loan Losses [Member] | Other consumer | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			140
Allowance for Loan Losses [Member] | Other consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						7,016
Allowance for Loan Losses [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	76,475	34,525	34,525
Financing Receivable, Allowance for Credit Loss	76,475	34,525	76,475	72,353	76,475
Recoveries	1,031		3,579
Net Charge offs	(277)		(4,797)
Gross up of allowance for PCD loans at acquisition			1,134
Provision for credit losses	(3,845)		(7,183)
Balance at end of period	72,353		76,475
Allowance for credit losses on loans
Recoveries	1,031		3,579
Net Charge offs	(277)		(4,797)
Gross up of allowance for PCD loans at acquisition			1,134
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(1,308)		(8,376)
Net Charge offs	(277)		(4,797)
Allowance for Loan Losses [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						86,405
Allowance for Loan Losses [Member] | Total consumer | First Staunton Bancshares [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses			917
Allowance for Loan Losses [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss						51,880
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	47,776	21,907	21,907
Off-Balance Sheet, Credit Loss, Liability	47,776	21,907	47,776	50,776	47,776
Provision for credit losses	3,000		7,000
Balance at end of period	50,776		47,776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						40,597
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			179
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,690
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	22,311	12,276	12,276
Off-Balance Sheet, Credit Loss, Liability	22,311	12,276	22,311	24,728	22,311
Provision for credit losses	2,417		13,972
Balance at end of period	24,728		22,311
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						8,278
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			61
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						(3,998)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	266	127	127
Off-Balance Sheet, Credit Loss, Liability	304	127	127	304	266
Provision for credit losses	38		135
Balance at end of period	304		266
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						127
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			4
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	22,577	12,403	12,403
Off-Balance Sheet, Credit Loss, Liability	22,577	12,403	22,577	25,033	22,577
Provision for credit losses	2,455		14,108
Balance at end of period	25,033		22,577
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						8,405
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			65
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						(3,998)
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	636	530	530
Off-Balance Sheet, Credit Loss, Liability	636	530	636	651	636
Provision for credit losses	15		(141)
Balance at end of period	651		636
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						776
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			2
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						246
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	18,887	7,532	7,532
Off-Balance Sheet, Credit Loss, Liability	18,887	7,532	18,887	19,309	18,887
Provision for credit losses	422		(7,038)
Balance at end of period	19,309		18,887
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						25,879
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			45
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,347
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	19,523	8,062	8,062
Off-Balance Sheet, Credit Loss, Liability	19,960	8,062	8,062	19,960	19,523
Provision for credit losses	437		(7,179)
Balance at end of period	19,960		19,523
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						26,655
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			47
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						18,593
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	42,101	20,465	20,465
Off-Balance Sheet, Credit Loss, Liability	42,101	20,465	42,101	44,993	42,101
Provision for credit losses	2,892		6,929
Balance at end of period	44,993		42,101
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						35,060
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			112
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						14,595
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	3,118	1,038	1,038
Off-Balance Sheet, Credit Loss, Liability	2,919	1,038	1,038	2,919	3,118
Provision for credit losses	(199)		(577)
Balance at end of period	2,919		3,118
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						3,629
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						2,591
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	2,557	405	405
Off-Balance Sheet, Credit Loss, Liability	2,557	405	2,557	2,865	2,557
Provision for credit losses	307		649
Balance at end of period	2,865		2,557
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						1,909
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Other consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						1,504
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	5,675	1,443	1,443
Off-Balance Sheet, Credit Loss, Liability	5,675	1,443	5,675	5,783	5,675
Provision for credit losses	108		72
Balance at end of period	5,783		5,675
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						5,538
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses			66
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability						4,095
Allowance for Loans Losses and Unfunded Commitments [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	8,410		11,422
Net Charge offs	(4,764)		(100,631)
Gross up of allowance for PCD loans at acquisition			3,504
Allowance for credit losses on loans
Balance at beginning of period	431,478	223,278	223,278
Allowance for Credit Losses on Loans	431,478	223,278	431,478	$ 403,714	$ 431,478
Recoveries	8,410		11,422
Net Charge offs	(4,764)		(100,631)
Gross up of allowance for PCD loans at acquisition			3,504
Provision for credit losses	(23,000)		171,457
Balance at end of period	403,714		431,478
Percent of Loans				1.67%	1.76%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(13,174)		(112,053)
Net Charge offs	(4,764)		(100,631)
Allowance for Loans Losses and Unfunded Commitments [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						354,425
Allowance for Loans Losses and Unfunded Commitments [Member] | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			2,722
Allowance for Loans Losses and Unfunded Commitments [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						131,147
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	0		0
Net Charge offs	0		0
Gross up of allowance for PCD loans at acquisition			0
Allowance for credit losses on loans
Balance at beginning of period	531	0	0
Allowance for Credit Losses on Loans	607	0	0	$ 607	$ 531
Recoveries	0		0
Net Charge offs	0		0
Gross up of allowance for PCD loans at acquisition			0
Provision for credit losses	76		531
Balance at end of period	607		531
Percent of Loans				0.07%	0.07%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	0		0
Net Charge offs	0		0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			0
Allowance for Loans Losses and Unfunded Commitments [Member] | PPP | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						0
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	4,490		7,004
Net Charge offs	1,367		(73,316)
Gross up of allowance for PCD loans at acquisition			293
Allowance for credit losses on loans
Balance at beginning of period	165,105	103,409	103,409
Allowance for Credit Losses on Loans	165,105	103,409	165,105	$ 149,435	$ 165,105
Recoveries	4,490		7,004
Net Charge offs	1,367		(73,316)
Gross up of allowance for PCD loans at acquisition			293
Provision for credit losses	(17,037)		85,327
Balance at end of period	149,435		165,105
Percent of Loans				1.95%	2.14%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(3,123)		(80,320)
Net Charge offs	1,367		(73,316)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						152,330
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			469
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and industrial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						48,921
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	4		147
Net Charge offs	4		(272)
Gross up of allowance for PCD loans at acquisition			890
Allowance for credit losses on loans
Balance at beginning of period	11,539	10,411	10,411
Allowance for Credit Losses on Loans	11,539	10,411	11,539	$ 12,090	$ 11,539
Recoveries	4		147
Net Charge offs	4		(272)
Gross up of allowance for PCD loans at acquisition			890
Provision for credit losses	547		2,102
Balance at end of period	12,090		11,539
Percent of Loans				1.37%	1.28%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	0		(419)
Net Charge offs	4		(272)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						8,560
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			259
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — owner occupied | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						(1,851)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	4,494		7,151
Net Charge offs	1,370		(73,588)
Gross up of allowance for PCD loans at acquisition			1,183
Allowance for credit losses on loans
Balance at beginning of period	177,175	113,820	113,820
Allowance for Credit Losses on Loans	162,132	113,820	113,820	$ 162,132	$ 177,175
Recoveries	4,494		7,151
Net Charge offs	1,370		(73,588)
Gross up of allowance for PCD loans at acquisition			1,183
Provision for credit losses	(16,414)		87,961
Balance at end of period	162,132		177,175
Percent of Loans				1.73%	1.89%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(3,123)		(80,739)
Net Charge offs	1,370		(73,588)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						160,890
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			728
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial and business lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						47,070
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	2,854		643
Net Charge offs	(5,886)		(22,277)
Gross up of allowance for PCD loans at acquisition			753
Allowance for credit losses on loans
Balance at beginning of period	94,071	41,044	41,044
Allowance for Credit Losses on Loans	94,071	41,044	94,071	$ 89,894	$ 94,071
Recoveries	2,854		643
Net Charge offs	(5,886)		(22,277)
Gross up of allowance for PCD loans at acquisition			753
Provision for credit losses	1,709		71,792
Balance at end of period	89,894		94,071
Percent of Loans				2.11%	2.17%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(8,739)		(22,920)
Net Charge offs	(5,886)		(22,277)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						43,331
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			474
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate — investor | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						2,287
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	31		49
Net Charge offs	29		31
Gross up of allowance for PCD loans at acquisition			435
Allowance for credit losses on loans
Balance at beginning of period	78,080	32,447	32,447
Allowance for Credit Losses on Loans	73,552	32,447	32,447	$ 73,552	$ 78,080
Recoveries	31		49
Net Charge offs	29		31
Gross up of allowance for PCD loans at acquisition			435
Provision for credit losses	(4,557)		18,816
Balance at end of period	73,552		78,080
Percent of Loans				3.91%	4.24%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(3)		(19)
Net Charge offs	29		31
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						58,261
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			537
Allowance for Loans Losses and Unfunded Commitments [Member] | Real estate construction | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						25,814
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	2,885		692
Net Charge offs	(5,857)		(22,246)
Gross up of allowance for PCD loans at acquisition			1,188
Allowance for credit losses on loans
Balance at beginning of period	172,152	73,490	73,490
Allowance for Credit Losses on Loans	163,446	73,490	73,490	$ 163,446	$ 172,152
Recoveries	2,885		692
Net Charge offs	(5,857)		(22,246)
Gross up of allowance for PCD loans at acquisition			1,188
Provision for credit losses	(2,849)		90,608
Balance at end of period	163,446		172,152
Percent of Loans				2.66%	2.78%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(8,742)		(22,938)
Net Charge offs	(5,857)		(22,246)
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						101,591
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			1,011
Allowance for Loans Losses and Unfunded Commitments [Member] | Commercial real estate lending | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						28,101
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	7,379		7,844
Net Charge offs	(4,487)		(95,834)
Gross up of allowance for PCD loans at acquisition			2,371
Allowance for credit losses on loans
Balance at beginning of period	349,327	187,311	187,311
Allowance for Credit Losses on Loans	349,327	187,311	349,327	$ 325,578	$ 349,327
Recoveries	7,379		7,844
Net Charge offs	(4,487)		(95,834)
Gross up of allowance for PCD loans at acquisition			2,371
Provision for credit losses	(19,262)		178,569
Balance at end of period	325,578		349,327
Percent of Loans				2.10%	2.25%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(11,865)		(103,677)
Net Charge offs	(4,487)		(95,834)
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						262,482
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			1,739
Allowance for Loans Losses and Unfunded Commitments [Member] | Total commercial | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						75,171
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	134		500
Net Charge offs	(109)		(1,367)
Gross up of allowance for PCD loans at acquisition			651
Allowance for credit losses on loans
Balance at beginning of period	42,996	16,960	16,960
Allowance for Credit Losses on Loans	45,215	16,960	16,960	$ 45,215	$ 42,996
Recoveries	134		500
Net Charge offs	(109)		(1,367)
Gross up of allowance for PCD loans at acquisition			651
Provision for credit losses	2,328		(6,864)
Balance at end of period	45,215		42,996
Percent of Loans				0.59%	0.55%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(243)		(1,867)
Net Charge offs	(109)		(1,367)
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						50,175
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			403
Allowance for Loans Losses and Unfunded Commitments [Member] | Residential mortgage | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						33,215
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	583		1,978
Net Charge offs	344		259
Gross up of allowance for PCD loans at acquisition			422
Allowance for credit losses on loans
Balance at beginning of period	21,967	11,964	11,964
Allowance for Credit Losses on Loans	21,967	11,964	21,967	$ 19,290	$ 21,967
Recoveries	583		1,978
Net Charge offs	344		259
Gross up of allowance for PCD loans at acquisition			422
Provision for credit losses	(3,021)		(5,358)
Balance at end of period	19,290		21,967
Percent of Loans				2.96%	3.11%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(238)		(1,719)
Net Charge offs	344		259
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						26,204
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			440
Allowance for Loans Losses and Unfunded Commitments [Member] | Home equity | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						14,240
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	315		1,101
Net Charge offs	(511)		(3,689)
Gross up of allowance for PCD loans at acquisition			61
Allowance for credit losses on loans
Balance at beginning of period	17,187	7,044	7,044
Allowance for Credit Losses on Loans	13,631	7,044	7,044	$ 13,631	$ 17,187
Recoveries	315		1,101
Net Charge offs	(511)		(3,689)
Gross up of allowance for PCD loans at acquisition			61
Provision for credit losses	(3,044)		5,111
Balance at end of period	13,631		17,187
Percent of Loans				4.57%	5.49%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(827)		(4,790)
Net Charge offs	(511)		(3,689)
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						15,564
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			140
Allowance for Loans Losses and Unfunded Commitments [Member] | Other consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						8,520
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Recoveries	1,031		3,579
Net Charge offs	(277)		(4,797)
Gross up of allowance for PCD loans at acquisition			1,134
Allowance for credit losses on loans
Balance at beginning of period	82,150	35,968	35,968
Allowance for Credit Losses on Loans	78,136	$ 35,968	35,968	$ 78,136	$ 82,150
Recoveries	1,031		3,579
Net Charge offs	(277)		(4,797)
Gross up of allowance for PCD loans at acquisition			1,134
Provision for credit losses	(3,738)		(7,112)
Balance at end of period	78,136		82,150
Percent of Loans				0.90%	0.92%
Allowance for Loan and Lease Losses [Roll Forward]
Charge offs	(1,308)		(8,376)
Net Charge offs	$ (277)		(4,797)
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						91,943
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | First Staunton Bancshares [Member]
Allowance for credit losses on loans
Provision for credit losses			$ 983
Allowance for Loans Losses and Unfunded Commitments [Member] | Total consumer | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for credit losses on loans
Allowance for Credit Losses on Loans						$ 55,975

Loans Narrative (Details)

Loans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Loans Information [Line Items]
Interest receivable	$ 86,466		$ 90,263
Financing Receivable, Nonaccrual, Interest Income	98	327
Recorded Investment, loans modified in troubled debt restructuring	$ 5,999	$ 4,899
Restructured Loans Subsequently Accruing	3,000
Ytd Restructured Loans Still On Nonaccrual	3,000
Loans and Finance Receivables [Member]
Loans Information [Line Items]
Interest receivable	64,000		66,000
Possible Liquidity Issues [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	49,000		$ 68,000
Possible Liquidity Issues [Member] | Commercial And Industrial Financing Receivable [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	36,000
Possible Liquidity Issues [Member] | Commercial Real Estate Portfolio [Member]
Loans Information [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 13,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Summary of core deposit intangibles and other intangibles
Other intangible amortization	$ 2,236	$ 2,814
Core Deposit Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year			$ 88,109	$ 80,730
Additions during the period	0		7,379
Accumulated amortization	(23,408)		(21,205)
Net book value	64,701		66,904
Other intangible amortization	2,203		8,749
Other Intangibles
Summary of core deposit intangibles and other intangibles
Gross carrying amount at the beginning of the year			2,000	$ 38,970
Additions during the period	0		200
Accumulated amortization	(683)		(20,385)
Net book value	0		1,350
Other intangible amortization	33		1,443
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Summary of core deposit intangibles and other intangibles
Reductions due to sale	$ (1,317)		$ (17,435)

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$ 59,967	$ 67,607
Additions from acquisition	0	1,357
Additions	3,348	13,667
Amortization	(6,388)	(22,664)
Mortgage servicing rights at end of period	56,927	59,967
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period	(18,006)	(302)
(Additions) recoveries, net	10,578	(17,704)
Valuation allowance at end of period	(7,428)	(18,006)
Mortgage servicing rights, net	49,500	41,961
Fair value of mortgage servicing rights	49,541	41,990
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,313,308	$ 7,743,956
Mortgage servicing rights, net to servicing portfolio	0.68%	0.54%
Mortgage servicing rights expense(a)	$ (4,190)	$ 40,369

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Core Deposit Intangibles
Estimated future amortization expense
Nine Months Ending December 31, 2021	$ 6,608
Year ending December 31, 2022	8,811
Year ending December 31, 2023	8,811
Year ending December 31, 2024	8,811
Year ending December 31, 2025	8,811
Year ending December 31, 2026	8,811
Beyond 2026	14,038
Net book value	64,701	$ 66,904
Other Intangibles
Estimated future amortization expense
Net book value	0	$ 1,350
Mortgage Servicing Rights
Estimated future amortization expense
Nine Months Ending December 31, 2021	8,345
Year ending December 31, 2022	11,550
Year ending December 31, 2023	8,909
Year ending December 31, 2024	6,983
Year ending December 31, 2025	5,547
Year ending December 31, 2026	4,466
Beyond 2026	11,125
Net book value	$ 56,927

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets (Details Textuals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	$ (10,578)	$ 17,704
Goodwill [Line Items]
Goodwill	1,104,992	1,109,300
Other Intangibles | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Goodwill [Line Items]
Decrease of other intangible assets	$ 1,317	$ 17,435

Short and Long-Term Funding, FH

Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Short-term Funding [Abstract]
Federal funds purchased	$ 7,450	$ 7,070
Securities sold under agreements to repurchase	131,057	185,901
Federal funds purchased and securities sold under agreements to repurchase	138,507	192,971
Commercial paper	51,171	59,346
Total short-term funding	189,678	252,317
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
Finance lease liability	1,091	1,128
Capitalized costs	(1,362)	(1,663)
FHLB Advances - long-term
FHLB advances	1,629,966	1,632,723
Total long-term funding	2,179,694	2,182,188
Total short and long-term funding	2,369,372	2,434,505
Bank senior notes, at par, due 2021
Long-Term Funding
Senior notes	$ 300,000	$ 300,000

Short and Long-Term Funding (Re

Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 131,057	$ 185,901
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	131,057	185,901
Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	131,057	185,901
Agency mortgage-related securities | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	131,057	185,901
Agency mortgage-related securities | Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | 30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Agency mortgage-related securities | Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 0	$ 0

Short and Long-Term Funding (Lo

Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Thousands	Aug. 13, 2018	Nov. 30, 2014	Mar. 31, 2021	Dec. 31, 2020
Long-Term Funding
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed			$ 192,000
Fixed Interest Rates, Finance Leases			1.00%
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances			$ 1,629,966	$ 1,632,723
Two Thousand Eighteen Senior Notes [Member] [Domain]
Long-Term Funding
Debt Instrument, Issuance Date Month, Year	August 2018
New Senior Debt Issued	$ 300,000
Debt Instrument, Maturity Date Month, Year	August 2021
Debt Instrument Call Date Earliest Month Year	July 2021
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Two Thousand Fourteen Subordinated Notes
Long-Term Funding
Debt Instrument, Issuance Date Month, Year		November 2014
Junior Subordinated Debentures Issued		$ 250,000
Debt Instrument, Term		10 years
Debt Instrument, Maturity Date Month, Year		January 2025
Debt Instrument Call Date Earliest Month Year		October 2024
Subordinated Borrowing, Interest Rate		4.25%

Derivative and Hedging Activi_3

Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Inputs, Level 3
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	$ 4,255	$ 0
Derivatives (trading liabilities)	0	2,046
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	4,255	0
Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror | Fair Value, Measurements, Recurring
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	121,020	192,518
Derivatives (trading liabilities)	28,382	25,680
Fair Value, Inputs, Level 2 | Commodity contracts | Fair Value, Measurements, Recurring
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Asset	5,808	12,486
Derivatives (trading liabilities)	5,098	11,155
Asset
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other assets), fair value	141,043	219,537
Less: Legally enforceable master netting agreements	2,643	1,936
Less: Cash collateral pledged/received	1,581	10,879
Derivative Asset	136,819	206,722
Liability
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivatives (trading and other liabilities), fair value	36,308	43,716
Less: Legally enforceable master netting agreements	2,643	1,936
Less: Cash collateral pledged/received	17,583	25,625
Derivatives (trading liabilities)	16,082	16,155
Not designated as hedging instruments | Asset | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	3,654,732	3,639,679
Not designated as hedging instruments | Asset | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	448,395	411,292
Not designated as hedging instruments | Asset | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	70,633	87,547
Not designated as hedging instruments | Asset | Mortgage banking(a)(b)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	292,704	226,818
Not designated as hedging instruments | Liability | Interest rate-related instruments — customer and mirror
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	3,654,732	3,639,679
Not designated as hedging instruments | Liability | Foreign currency exchange forwards
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	439,381	398,890
Not designated as hedging instruments | Liability | Commodity contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	70,758	83,214
Not designated as hedging instruments | Liability | Mortgage banking(a)(b)
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 408,500	$ 335,500

Derivative and Hedging Activi_4

Derivative and Hedging Activities Income impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Inputs, Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	$ 4,255		$ 0
Derivatives (trading liabilities)	0		2,046
Interest rate lock commitments (mortgage) | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	3,044		4,909
Derivatives (trading liabilities)	2,828		4,836
Interest Rate Lock Commitments and Forward Commitments Total | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	11,171
Mortgage banking(a)(b) | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	6,917		9,624
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives (trading and other assets), fair value	141,043		219,537
Derivative Asset	136,819		206,722
Other Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives (trading and other liabilities), fair value	36,308		43,716
Derivatives (trading liabilities)	16,082		$ 16,155
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(485)	$ (322)
Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	(262)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(485)	(322)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	(262)
Designated as Hedging Instrument | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Designated as Hedging Instrument | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0	$ 0

Derivative and Hedging Activi_5

Derivative and Hedging Activities Derivative Impact on Perfomance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Other Liabilities [Member]
Derivative Instruments
Derivatives (trading and other liabilities), fair value	$ 36,308		$ 43,716
Derivatives (trading liabilities)	16,082		16,155
Other Liabilities [Member] | Fair Value, Inputs, Level 2
Derivative Instruments
Derivatives (trading and other liabilities), fair value	36,308		41,671
Derivatives (trading liabilities)	36,308		$ 41,671
Capital markets, net | Interest rate-related instruments — customer and mirror, net
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	2,938	$ (3,090)
Capital markets, net | Foreign currency exchange forwards
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	143	(122)
Capital markets, net | Commodity contracts
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(621)	746
Mortgage banking, net | Interest rate lock commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(2,708)	9,928
Mortgage banking, net | Forward commitments (mortgage)
Derivative Instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (6,300)	$ (10,262)

Derivative and Hedging Activi_6

Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 67,000	$ 72,000
Derivative collateral right to reclaim cash	21,000	$ 31,000
Balance Sheet Recording of Fair Value Hedge [Line Items]
Forward commitment fair value	4,000
Designated as Hedging Instrument
Balance Sheet Recording of Fair Value Hedge [Line Items]
Derivative Liability Notional Amount, Terminated			$ 500,000
Underlying Hedged Asset, Amortized Cost Basis	534,000
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 3,000

Balance Sheet Offsetting (Detai

Balance Sheet Offsetting (Details) - Interest Rate Contract - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative assets
Gross Amounts Recognized	$ 4,496	$ 13,441
Derivative Liabilities Offset	(2,643)	(1,936)
Derivative Asset, Collateral, Obligation to Return Cash, Offset	(1,581)	(10,879)
Net Amounts Presented on the Consolidated Balance Sheets	272	626
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	0
Net Amount	272	626
Derivative liabilities
Gross Amounts Recognized	20,393	27,951
Derivative Liability, Fair Value, Gross Asset	(2,643)	(1,936)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	(17,583)	(25,625)
Net Amounts Presented on the Consolidated Balance Sheets	167	390
Gross Amounts Not Offset on the Consolidated Balance Sheets	0	0
Net Amount	$ 167	$ 390

Commitments, Off-Balance Shee_3

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters, Summary of Lending Related and Other Commitments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of lending-related and other commitments [Line Items]
Lending related commitments, fair value	$ 0	$ 0
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
Summary of lending-related and other commitments
Lending related commitments	10,102,713	10,010,492
Commercial letters of credit(a)
Summary of lending-related and other commitments
Lending related commitments	7,301	3,642
Standby letters of credit(c)
Summary of lending-related and other commitments
Lending related commitments	247,473	$ 278,798
Standby letters of credit, fair value	$ 3,000

Commitment, Changes in the Allo

Commitment, Changes in the Allowance for Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Balance at beginning of period	$ 47,776	$ 21,907
Off-Balance Sheet, Credit Loss, Liability	47,776	47,776
Provision for credit losses	3,000	7,000
Balance at end of period	$ 50,776	47,776
Cumulative Effect, Period Of Adoption, Adjusted Balance
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability			$ 40,597
First Staunton Bancshares [Member]
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Provision for credit losses		$ 179
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability			$ 18,690

Commitments, Off-Balance Shee_4

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 50,776,000			$ 47,776,000	$ 21,907,000
Provision for credit losses	3,000,000			7,000,000
Expense Related to Qualified Affordable Housing Projects	8,000,000	$ 6,000,000
Remaining Investment in Qualified Affordable Housing Projects	277,000,000			268,000,000
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount	119,000,000			118,000,000
Qualified Affordable Housing Investments, Impairment Loss	0		$ 0
Loans Repurchased Under Make Whole Requests	$ 2,000,000			10,000,000
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid	109 thousand		no
Loans Sold To Outside Investors Original Amount	$ 14,700,000,000
Loans Sold To Outside Investors Remaining Outstanding Amount	6,500,000,000
Mortgage Repurchase Reserve	1,000,000			2,000,000
Residential Mortgage Loans Sold With Recourse Risk	27,000,000			36,000,000
Residential Mortgage Loans Sold With Credit Recourse Risk	31,000,000			33,000,000
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	280,000,000			272,000,000
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	$ 23,000,000			$ 25,000,000

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 3,356,949	$ 3,085,441
Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	53,693	26,531
Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,303,257	3,058,910
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Trading assets	4,255	0
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	2,046
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Assets, Fair Value Disclosure [Abstract]
Trading assets	4,255	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	1,684	1,661
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Total investment securities AFS
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	53,693	26,531
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | SBA
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities		8,584
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | FFELP
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	325,933	327,189
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Debt And Other Equity Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,000	3,000
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Total investment securities AFS
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	3,303,257	3,058,910
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential loans held for sale
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	153,151	129,158
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest rate-related instruments — customer and mirror, net
Assets, Fair Value Disclosure [Abstract]
Trading assets	121,020	192,518
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	28,382	25,680
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign currency exchange forwards
Assets, Fair Value Disclosure [Abstract]
Trading assets	3,044	4,909
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	2,828	4,836
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts
Assets, Fair Value Disclosure [Abstract]
Trading assets	5,808	12,486
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	5,098	11,155
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Mortgage banking(a)(b)
Assets, Fair Value Disclosure [Abstract]
Trading assets	6,917	9,624
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	94,349	22,904
FNMA / FHLMC | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	1,910,954	1,461,241
GNMA [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Commercial mortgage-related securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	389,411	524,756
GNMA [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Residential Related Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	123,365	235,537
US Treasury Securities
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities		26,531
US Treasury Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	53,693	26,531
Obligations of state and political subdivisions (municipal securities)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	433,182	450,662
Obligations of state and political subdivisions (municipal securities) | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	433,182	450,662
Agency Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	14,904	25,038
SBA
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,160
SBA | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 8,160	$ 8,584

Fair Value Measurements Financi

Fair Value Measurements Financial Instruments Classified Within Level 3 (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Interest rate lock commitments to originate residential mortgage loans held for sale
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ 9,624	$ 2,527
New production	16,629	72,659
Closed loans / settlements	(14,186)	(76,001)
Other	(5,151)	10,439
Mortgage derivative gain (loss)	(2,708)	7,097
Ending Balance	6,917	9,624
Forward commitments to sell residential mortgage loans
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	2,046	710
New production	(1,203)	(3,505)
Closed loans / settlements	2,501	(12,587)
Other	(7,598)	17,427
Mortgage derivative gain (loss)	(6,300)	1,335
Ending Balance	(4,255)	2,046
Total derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	7,579	1,817
New production	17,832	76,164
Closed loans / settlements	(16,687)	(63,414)
Other	2,447	(6,988)
Mortgage derivative gain (loss)	3,593	5,762
Ending Balance	$ 11,171	$ 7,579

Fair Value Measurements Equity

Fair Value Measurements Equity Securities Without Readily Determinable Fair Values (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2020	$ 13,000
Additions	544
Carrying value as of March 31, 2021	14,000
Fair Value, Inputs, Level 3
Equity Securities Without Readily Determinable Fair Value Amount [Roll Forward]
Carrying value as of December 31, 2020	13,444
Carrying value changes	0
Carrying value as of March 31, 2021	13,989
Cumulative upward carrying value changes between January 1, 2018 and March 31, 2021	13,444
Cumulative downward carrying value changes/impairment between January 1, 2018 and March 31, 2021	$ 0

Fair Value Measurements, Asse_2

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 49,541		$ 41,990
Mortgage banking, net	(10,578)	$ 9,098
Equity securities	14,000		13,000
Investment securities gains (losses), net	15,673		15,106
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity securities	13,989		13,444
Investment securities gains (losses), net	13,989		13,444
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
OREO(b)	10,326		6,125
Other noninterest expense	3,681		3,747
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Individually evaluated loans(a)	93,201		138,752
Provision for credit losses	(1,613)		97,519
Mortgage servicing rights	49,541		41,990
Mortgage banking, net	$ 10,578		$ (17,704)

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Unobservable Level 3 Measurements (Details) - Fair Value, Inputs, Level 3	3 Months Ended
	Mar. 31, 2021
Discounted Cash Flow | Mortgage Servicing Rights | Minimum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	10.00%
Discounted Cash Flow | Mortgage Servicing Rights | Maximum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	14.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	45.00%
Discounted Cash Flow | Mortgage Servicing Rights | Weighted Average [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	9.00%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed	16.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable | Minimum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	25.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable | Maximum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	38.00%
Appraisals/Discounted Cash Flow | Impaired Finance Receivable | Weighted Average [Member]
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	34.00%

Fair Value Measurements, Fair V

Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets
Cash and due from banks	$ 356,285	$ 416,154
Interest-bearing deposits in other financial institutions	1,590,494	298,759
Federal funds sold and securities purchased under agreements to resell	0	1,135
Investment securities HTM, net	1,857,150	1,879,005
Investment securities held to maturity, fair value	1,972,541	2,028,943
Available-for-sale Securities	3,356,949	3,085,441
Equity securities with readily determinable fair values, Fair Value	2,000	2,000
Equity Securities without Readily Determinable Fair Value, Amount	14,000	13,000
Investment securities gains (losses), net	15,673	15,106
FHLB and Federal Reserve Bank stocks	168,281	168,280
Residential loans held for sale	153,151	129,158
Loans, net	23,809,389	24,068,022
Bank owned life insurance, fair value	680,831	679,647
Financial liabilities
Short-term funding	189,678	252,317
FHLB advances	1,629,966	1,632,723
Letters of Credit Outstanding, Amount	247,000	279,000
Total long-term funding	2,179,694	2,182,188
Fair Value, Inputs, Level 1
Financial assets
Investment securities HTM, net	1,000	999
Investment securities held to maturity, fair value	1,019	1,024
Available-for-sale Securities	53,693	26,531
Investment securities available for sale, fair value	53,693	26,531
Equity securities with readily determinable fair value, Carrying Amount	1,684	1,661
Equity securities with readily determinable fair values, Fair Value	1,684	1,661
Fair Value, Inputs, Level 2
Financial assets
Investment securities HTM, net	1,856,088	1,877,939
Investment securities held to maturity, fair value	1,971,459	2,027,852
Available-for-sale Securities	3,303,257	3,058,910
Investment securities available for sale, fair value	3,303,257	3,058,910
Financial liabilities
Brokered CDs and other time deposits	1,561,352	1,757,030
Brokered CDs and other time deposits, fair value	1,566,421	1,766,200
Short-term funding	189,678	252,317
Short-term funding, fair value	189,672	252,303
Long-term funding, fair value	576,183	578,233
Advances, Fair Value Disclosure	1,693,172	1,760,727
Standby letters of credit	2,549	2,731
Standby letters of credit, fair value	2,549	2,731
Total long-term funding	549,729	549,465
Fair Value, Inputs, Level 2 | Other Assets [Member]
Financial assets
Derivative Asset	129,872	209,913
Derivatives (trading and other assets), fair value	129,872	209,913
Fair Value, Inputs, Level 2 | Other Liabilities [Member]
Financial liabilities
Derivatives (trading liabilities)	36,308	41,671
Derivatives (trading and other liabilities), fair value	36,308	41,671
Fair Value, Inputs, Level 3
Financial assets
Equity Securities without Readily Determinable Fair Value, Amount	13,989	13,444
Investment securities gains (losses), net	13,989	13,444
Loans, net, fair value	23,723,543	24,012,738
Derivative Asset	4,255	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	26,115,814	24,725,451
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value	26,115,814	24,725,451
Derivatives (trading liabilities)	0	2,046
Fair Value, Inputs, Level 3 | Mortgage banking(a)(b) | Fair Value, Measurements, Recurring
Financial assets
Derivative Asset	6,917	9,624
Fair Value, Inputs, Level 3 | Forward commitments (mortgage)
Financial assets
Derivative Asset	$ 4,255	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details Textuals)	3 Months Ended
	Mar. 31, 2021
Fair Value Measurements (Textuals) [Abstract]
Fair Value Inputs Closing Ratio	89.00%

Retirement Plans, Components of

Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
RAP
Net period benefit cost for the pension and postretirement plans
Service cost	$ 2,075	$ 2,165
Interest cost	1,623	2,008
Expected return on plan assets	(6,430)	(6,405)
Amortization of prior service cost	(18)	(19)
Amortization of actuarial loss (gain)	1,050	808
Total net periodic pension cost	(1,701)	(1,444)
Postretirement Plan
Net period benefit cost for the pension and postretirement plans
Interest cost	13	20
Amortization of prior service cost	(19)	(19)
Total net periodic pension cost	$ (6)	$ 1

Retirement Plans (Details Textu

Retirement Plans (Details Textuals) (Details) - USD ($) $ in Millions	Feb. 15, 2020	Feb. 14, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
First Staunton Bancshares [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effective Date of Acquisition		Feb. 14, 2020
Business Acquisition, Effective Date of Retirement Eligibility	Feb. 15, 2020
RAP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Description			The Corporation has a noncontributory defined benefit retirement account plan, the RAP, covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes.
Defined Benefit Plan, Weighted Average Interest Crediting Rate			2.80%		2.80%
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 0	$ 0

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Income Statement Data Abstract
Net interest income	$ 175,902	$ 202,942
Net intersegment interest income (expense)	0	0
Segment net interest income	175,902	202,942
Noninterest income(a)	95,343	98,306
Total revenue	271,245	301,248
Provision for credit losses	(23,004)	53,001
Noninterest expense	175,347	192,191
Income (loss) before income taxes	118,903	56,056
Income tax expense (benefit)	24,602	10,219
Net income	94,301	45,838
Segment Balance Sheet Data
Allocated goodwill	1,104,992	1,191,388
Operating Segments | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	93,161	107,753
Net intersegment interest income (expense)	6,684	(10,726)
Segment net interest income	99,845	97,028
Noninterest income(a)	43,031	38,733
Total revenue	142,876	135,761
Provision for credit losses	17,509	12,172
Noninterest expense	57,725	54,304
Income (loss) before income taxes	67,642	69,284
Income tax expense (benefit)	12,649	12,940
Net income	54,993	56,344
Segment Balance Sheet Data
Allocated goodwill	525,836	530,144
Operating Segments | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	68,275	74,927
Net intersegment interest income (expense)	12,875	18,665
Segment net interest income	81,150	93,592
Noninterest income(a)	46,128	53,350
Total revenue	127,278	146,942
Provision for credit losses	5,099	5,108
Noninterest expense	97,346	113,777
Income (loss) before income taxes	24,834	28,057
Income tax expense (benefit)	5,215	5,892
Net income	19,618	22,165
Segment Balance Sheet Data
Allocated goodwill	579,156	661,244
Operating Segments | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	14,465	20,261
Net intersegment interest income (expense)	(19,559)	(7,939)
Segment net interest income	(5,094)	12,322
Noninterest income(a)	6,184	6,223
Total revenue	1,091	18,545
Provision for credit losses	(45,612)	35,720
Noninterest expense	20,275	24,110
Income (loss) before income taxes	26,427	(41,285)
Income tax expense (benefit)	6,737	(8,613)
Net income	19,690	(32,672)
Segment Balance Sheet Data
Allocated goodwill	$ 0	$ 0

Segment Reporting (Details Text

Segment Reporting (Details Textuals) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)segment
Segment Reporting [Abstract]
Number of Reportable Segments | segment	3
Whitnell
Segment Reporting [Abstract]
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax	$ 2
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax	$ 2

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 12,618
Investment securities losses (gains), net	(75)	$ (80)
Personnel expense	(104,026)	(114,200)
Interest income	(518)	(556)
Total other comprehensive income (loss)	(16,811)	16,209
Ending Balance	(4,193)
Investment Securities AFS
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	41,325	3,989
Other comprehensive income (loss) before reclassifications	(23,979)	26,419
Investment securities losses (gains), net	39	(6,118)
Personnel expense	0	0
Other expense	0	0
Interest income	518	556
Income tax (expense) benefit	5,851	(5,225)
Total other comprehensive income (loss)	(17,571)	15,632
Ending Balance	23,754	19,620
Defined Benefit Pension and Postretirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(28,707)	(37,172)
Other comprehensive income (loss) before reclassifications	0	0
Investment securities losses (gains), net	0	0
Personnel expense	(37)	(38)
Other expense	1,050	808
Interest income	0	0
Income tax (expense) benefit	(253)	(193)
Total other comprehensive income (loss)	760	577
Ending Balance	(27,947)	(36,595)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	12,618	(33,183)
Other comprehensive income (loss) before reclassifications	(23,979)	26,419
Investment securities losses (gains), net	39	(6,118)
Personnel expense	(37)	(38)
Other expense	1,050	808
Interest income	518	556
Income tax (expense) benefit	5,598	(5,418)
Total other comprehensive income (loss)	(16,811)	16,209
Ending Balance	$ (4,193)	$ (16,974)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	$ 51,762	$ 71,348
Noninterest income (out-of-scope of Topic 606)	43,581	26,958
Total noninterest income	95,343	98,306
Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	76	22,608
Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	22,414	20,816
Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	14,855	15,222
Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	9,764	9,607
Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	4,653	3,096
Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	28,463	25,036
Noninterest income (out-of-scope of Topic 606)	14,568	13,697
Corporate and Commercial Specialty | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	24	76
Corporate and Commercial Specialty | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	22,414	20,106
Corporate and Commercial Specialty | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	4,905	3,551
Corporate and Commercial Specialty | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	435	515
Corporate and Commercial Specialty | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	685	788
Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	22,889	46,235
Noninterest income (out-of-scope of Topic 606)	23,239	7,115
Community, Consumer, and Business | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	50	22,529
Community, Consumer, and Business | Wealth management fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	0	710
Community, Consumer, and Business | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	9,935	11,665
Community, Consumer, and Business | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	9,325	9,045
Community, Consumer, and Business | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	3,579	2,286
Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	409	77
Noninterest income (out-of-scope of Topic 606)	5,775	6,146
Risk Management and Shared Services | Insurance commissions and fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	2	3
Risk Management and Shared Services | Service charges and deposit account fees
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	15	5
Risk Management and Shared Services | Card-based fees(a)
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	4	47
Risk Management and Shared Services | Other revenue
Disaggregation of Revenue [Line Items]
Noninterest income (in-scope of Topic 606)	389	23
Operating Segments [Member] | Corporate and Commercial Specialty
Disaggregation of Revenue [Line Items]
Total noninterest income	43,031	38,733
Operating Segments [Member] | Community, Consumer, and Business
Disaggregation of Revenue [Line Items]
Total noninterest income	46,128	53,350
Operating Segments [Member] | Risk Management and Shared Services
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 6,184	$ 6,223

Leases Lease, Cost and Cash Flo

Leases Lease, Cost and Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease costs	$ 2,240	$ 2,623
Finance lease costs	39	36
Operating lease cash flows	2,963	2,731
Finance lease cash flows	$ 40	$ 21

Leases Components of Lease Expe

Leases Components of Lease Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use asset	$ 32,071	$ 31,994
Finance lease right-of-use asset	854	962
Operating lease liability	36,079	36,425
Finance lease liability	$ 1,091	$ 1,128

Leases Operating Lease Informat

Leases Operating Lease Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Total lease payments	$ 40,257	$ 40,806
Operating Lease, Weighted Average Remaining Lease Term	6 years 3 months 29 days	6 years 5 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.22%	3.27%
Finance Lease, Liability, Payment, Due	$ 1,105	$ 1,145
Finance Lease, Weighted Average Remaining Lease Term	1 year 4 months 24 days	1 year 7 months 24 days
Finance Lease, Weighted Average Discount Rate, Percent	1.05%	1.05%
Equipment
Lessee, Lease, Description [Line Items]
Total lease payments	$ 385	$ 386
Operating Lease, Weighted Average Remaining Lease Term	2 years 2 months 26 days	2 years 5 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	0.46%	0.46%
Retail and corporate offices
Lessee, Lease, Description [Line Items]
Total lease payments	$ 33,707	$ 34,036
Operating Lease, Weighted Average Remaining Lease Term	5 years 11 months 8 days	6 years 14 days
Operating Lease, Weighted Average Discount Rate, Percent	3.27%	3.33%
Land
Lessee, Lease, Description [Line Items]
Total lease payments	$ 6,165	$ 6,385
Operating Lease, Weighted Average Remaining Lease Term	8 years 9 months 29 days	8 years 11 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.10%	3.09%
Finance Lease, Liability, Payment, Due	$ 1,105	$ 1,145
Finance Lease, Weighted Average Remaining Lease Term	1 year 4 months 24 days	1 year 7 months 24 days
Finance Lease, Weighted Average Discount Rate, Percent	1.05%	1.05%

Leases Amortization of Operatin

Leases Amortization of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Amortization of operating lease liabilities	Contractual lease payment obligations for each of the next five years and thereafter, in addition to a reconciliation to the Corporation’s lease liability, were as follows: ($ in Thousands) Operating Leases Finance Leases Total Leases Nine Months Ending December 31, 2021 $ 6,591 $ 132 $ 6,724 2022 7,111 973 8,084 2023 6,010 — 6,010 2024 5,274 — 5,274 2025 4,110 — 4,110 Beyond 2025 11,160 — 11,160 Total lease payments $ 40,257 $ 1,105 $ 41,362 Less: interest 4,178 14 4,192 Present value of lease payments $ 36,079 $ 1,091 $ 37,170
Operating Leases
Nine Months Ending December 31, 2021	$ 6,591
2021	7,111
2022	6,010
2023	5,274
2024	4,110
Beyond 2025	11,160
Total lease payments	40,257	$ 40,806
Less: interest	4,178
Present value of lease payments	36,079	36,425
Finance Leases
Nine Months Ending December 31, 2021	132
2022	973
2023	0
2024	0
2025	0
Beyond 2025	0
Total lease payments	1,105	1,145
Less: interest	14
Present value of lease payments	1,091	$ 1,128
Total Leases
Nine Months Ending December 31, 2021	6,724
2022	8,084
2023	6,010
2024	5,274
2025	4,110
Beyond 2025	11,160
Total lease payments	41,362
Less: interest	4,192
Present value of lease payments	$ 37,170

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Additional operating leases	$ 15	$ 17
Minimum
Lessee, Lease, Description [Line Items]
Operating lease terms	1 year
Additional operating lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease terms	42 years
Additional operating lease terms	6 years

Uncategorized Items - asb-20210

Label	Element	Value
Series C Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid	us-gaap_PreferredStockDividendsPerShareCashPaid	$ 0.3828125
Preferred Stock, Dividends, Per Share, Cash Paid	us-gaap_PreferredStockDividendsPerShareCashPaid	0.3828125
Series D Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid	us-gaap_PreferredStockDividendsPerShareCashPaid	0.3359375
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid	us-gaap_PreferredStockDividendsPerShareCashPaid	$ 0.3671875