WesBanco (WSBC) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 28, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	WESBANCO, INC.
Entity Central Index Key	0000203596
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		67,315,896
Entity Shell Company	false
Entity File Number	000-08467
Entity Incorporation, State or Country Code	WV
Entity Tax Identification Number	55-0571723
Entity Address, Address Line One	1 Bank Plaza
Entity Address, City or Town	Wheeling
Entity Address, State or Province	WV
Entity Address, Postal Zip Code	26003
City Area Code	304
Local Phone Number	234-9000
Document Quarterly Report	true
Document Transition Report	false
Common Stock
Document Information [Line Items]
Trading Symbol	WSBC
Title of 12(b) Security	Common Stock $2.0833 Par Value
Security Exchange Name	NASDAQ
Depositary Shares
Document Information [Line Items]
Trading Symbol	WSBCP
Title of 12(b) Security	Depositary Shares (each representing 1/40th interest in a share of 6.75% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A)
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks, including interest bearing amounts of $550,008 and $721,086, respectively	$ 759,048	$ 905,447
Securities:
Equity securities, at fair value	13,123	13,047
Available-for-sale debt securities, at fair value	2,775,212	1,978,136
Held-to-maturity debt securities (fair values of $839,872 and $768,183, respectively)	813,740	731,212
Allowance for credit losses, held-to-maturity debt securities	(290)	(326)
Net held-to-maturity debt securities	813,450	730,886
Total securities	3,601,785	2,722,069
Loans held for sale	153,520	168,378
Portfolio loans, net of unearned income	10,703,312	10,789,233
Allowance for credit losses - loans	(160,040)	(185,827)
Net portfolio loans	10,543,272	10,603,406
Premises and equipment, net	239,863	249,421
Accrued interest receivable	68,896	66,790
Goodwill and other intangible assets, net	1,160,195	1,163,091
Bank-owned life insurance	307,747	306,038
Other assets	223,462	240,970
Total Assets	17,057,788	16,425,610
Deposits:
Non-interest bearing demand	4,460,049	4,070,835
Interest bearing demand	3,126,186	2,839,536
Money market	1,771,703	1,685,927
Savings deposits	2,373,987	2,214,565
Certificates of deposit	1,555,074	1,618,510
Total deposits	13,286,999	12,429,373
Federal Home Loan Bank borrowings	433,984	549,003
Other short-term borrowings	137,218	241,950
Subordinated debt and junior subordinated debt	192,430	192,291
Total borrowings	763,632	983,244
Accrued interest payable	3,224	4,314
Other liabilities	218,411	251,942
Total Liabilities	14,272,266	13,668,873
SHAREHOLDERS' EQUITY
Preferred stock, no par value, 1,000,000 shares authorized; 150,000 shares 6.75% non-cumulative perpetual preferred stock, Series A, liquidation preference $150,000,000, issued and outstanding at March 31, 2021 and December 31, 2020, respectively	144,484	144,484
Common stock, $2.0833 par value; 100,000,000 shares authorized; 68,081,306 shares issued; 67,282,134 and 67,254,706 shares outstanding at March 31, 2021 and December 31, 2020, respectively	141,834	141,834
Capital surplus	1,636,103	1,634,815
Retained earnings	879,786	831,688
Treasury stock (799,172 and 826,600 shares - at cost, respectively)	(24,989)	(25,949)
Accumulated other comprehensive income	9,803	31,359
Deferred benefits for directors	(1,499)	(1,494)
Total Shareholders' Equity	2,785,522	2,756,737
Total Liabilities and Shareholders' Equity	$ 17,057,788	$ 16,425,610

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Interest bearing deposits, banks	$ 550,008,000	$ 721,086,000
Held-to-maturity securities, fair values	$ 839,872,000	$ 768,183,000
Preferred stock, no par value
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	150,000	150,000
Preferred stock, shares outstanding	150,000	150,000
6.75% non-cumulative perpetual preferred stock, Series A, liquidation preference	$ 150,000,000	$ 150,000,000
Common stock, par value	$ 2.0833	$ 2.0833
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	68,081,306	68,081,306
Common stock, shares outstanding	67,282,134	67,254,706
Treasury stock, shares	799,172	826,600

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 109,358	$ 119,503
Interest and dividends on securities:
Taxable	11,127	16,986
Tax-exempt	3,910	4,456
Total interest and dividends on securities	15,037	21,442
Other interest income	659	1,503
Total interest and dividend income	125,054	142,448
INTEREST EXPENSE
Interest bearing demand deposits	1,043	3,394
Money market deposits	578	2,352
Savings deposits	264	923
Certificates of deposit	2,370	4,054
Total interest expense on deposits	4,255	10,723
Federal Home Loan Bank borrowings	2,414	8,232
Other short-term borrowings	118	870
Subordinated debt and junior subordinated debt	1,789	2,461
Total interest expense	8,576	22,286
NET INTEREST INCOME	116,478	120,162
Provision for credit losses	(27,958)	29,821
Net interest income after provision for credit losses	144,436	90,341
NON-INTEREST INCOME
Electronic banking fees	4,365	4,254
Net securities brokerage revenue	1,524	1,679
Bank-owned life insurance	1,709	1,769
Mortgage banking income	4,264	1,276
Net securities gains	279	1,491
Net gain on other real estate owned and other assets	175	169
Other income	8,367	3,802
Total non-interest income	33,208	28,009
NON-INTEREST EXPENSE
Salaries and wages	36,890	38,910
Employee benefits	10,266	10,373
Net occupancy	7,177	7,084
Equipment and software	6,765	6,039
Marketing	2,384	1,138
FDIC insurance	1,282	2,113
Amortization of intangible assets	2,896	3,374
Restructuring and merger-related expense	851	5,164
Other operating expenses	17,816	17,138
Total non-interest expense	86,327	91,333
Income before provision for income taxes	91,317	27,017
Provision for income taxes	18,202	3,621
Net income	73,115	23,396
Preferred stock dividends	2,531
Net income available to common shareholders	$ 70,584	$ 23,396
EARNINGS PER COMMON SHARE
Basic	$ 1.05	$ 0.35
Diluted	$ 1.05	$ 0.35
AVERAGE COMMON SHARES OUTSTANDING
Basic	67,263,714	67,486,550
Diluted	67,355,418	67,587,446
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.33	$ 0.32
COMPREHENSIVE INCOME	$ 51,559	$ 63,336
Total Trust Fees [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	7,631	6,952
Service Charges on Deposits [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 4,894	$ 6,617

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Preferred Stock [Member]	Common Stock	Capital Surplus [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Deferred Benefits for Directors [Member]
Beginning Balance at Dec. 31, 2019	$ 2,593,921	$ (26,591)		$ 141,827	$ 1,636,966	$ 824,694	$ (26,591)	$ (9,463)	$ 1,201	$ (1,304)
Beginning Balance, shares at Dec. 31, 2019				67,824,428
Net income	23,396					23,396
Other comprehensive income (loss)	39,940								39,940
Comprehensive income	63,336
Common dividends declared	$ (21,435)					(21,435)
Accounting Standards Update [Extensible List]	ASU 2016-13 [Member]
Treasury shares acquired	$ (24,972)							(24,972)
Treasury shares acquired, shares				(786,012)
Stock options exercised	445				(276)			721
Stock options exercised, shares				19,739
Stock compensation expense	1,370				1,370
Deferred benefits for directors- net	(14)				62					(76)
Ending Balance at Mar. 31, 2020	2,586,060			$ 141,827	1,638,122	800,064		(33,714)	41,141	(1,380)
Ending Balance, shares at Mar. 31, 2020				67,058,155
Beginning Balance at Dec. 31, 2020	2,756,737		$ 144,484	$ 141,834	1,634,815	831,688		(25,949)	31,359	(1,494)
Beginning Balance, shares at Dec. 31, 2020				67,254,706
Net income	73,115					73,115
Other comprehensive income (loss)	(21,556)								(21,556)
Comprehensive income	51,559
Common dividends declared	(22,095)					(22,095)
Preferred dividends declared ($16.875 per share)	(2,531)					(2,531)
Stock issued for dividend reinvestment						(391)		391
Stock issued for dividend reinvestment, shares				11,720
Treasury shares acquired					183			(183)
Treasury shares acquired, shares				(5,135)
Stock options exercised	569				(183)			752
Stock options exercised, shares				20,843
Stock compensation expense	1,288				1,288
Deferred benefits for directors- net	(5)									(5)
Ending Balance at Mar. 31, 2021	$ 2,785,522		$ 144,484	$ 141,834	$ 1,636,103	$ 879,786		$ (24,989)	$ 9,803	$ (1,499)
Ending Balance, shares at Mar. 31, 2021				67,282,134

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)	3 Months Ended
	Mar. 31, 2021$ / shares
Statement Of Stockholders Equity [Abstract]
Common dividends declared, per share	$ 0.33
Preferred dividends declared, per share	$ 16.875

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 52,004	$ 32,884
INVESTING ACTIVITIES
Net decrease (increase) in loans held for investment	100,799	(131,110)
Available-for-sale debt securities:
Proceeds from sales	0	222,668
Proceeds from maturities, prepayments and calls	239,259	157,954
Purchases of securities	(1,068,526)	(197,153)
Held-to-maturity debt securities:
Proceeds from maturities, prepayments and calls	27,147	48,093
Purchases of securities	(110,298)	(11,734)
Equity securities:
Proceeds from sales		50
Proceeds from bank owned life insurance		10
Purchases of premises and equipment – net	(2,362)	(2,925)
Sale of portfolio loans		28,262
Net cash (used in) provided by investing activities	(813,981)	114,115
FINANCING ACTIVITIES
Increase in deposits	858,853	42,892
Proceeds from Federal Home Loan Bank borrowings		475,000
Repayment of Federal Home Loan Bank borrowings	(115,053)	(305,070)
(Decrease) increase in other short-term borrowings	(104,732)	59,104
Principal repayments of finance lease obligations	(109)	(104)
Decrease in federal funds purchased		(7,500)
Repayment of junior subordinated debt		(6,702)
Dividends paid to common shareholders	(21,419)	(21,016)
Dividends paid to preferred shareholders	(2,531)
Treasury shares sold (purchased) - net	569	(24,527)
Net cash provided by financing activities	615,578	212,077
Net (decrease) increase in cash, cash equivalents and restricted cash	(146,399)	359,076
Cash, cash equivalents and restricted cash at beginning of the period	905,447	234,796
Cash, cash equivalents and restricted cash at end of the period	759,048	593,872
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	$ 10,719	26,074
Transfers of loans to other real estate owned		28
Transfers of portfolio loans to loans held for sale		$ 37,195

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of presentation — The accompanying unaudited interim financial statements of Wesbanco, Inc. and its consolidated subsidiaries (“Wesbanco”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2020. Wesbanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2020 Annual Report on Form 10-K filed with the Securities and Exchange Commission. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly Wesbanco’s financial position and results of operations for each of the interim periods presented. Certain prior period amounts have been reclassified to conform to the current period presentation. Such reclassifications had no impact on Wesbanco’s net income and stockholders’ equity. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year. Recent accounting pronouncements— The Financial Accounting Standards Board (“FASB”) issued Accounting Standards Updates (“ASU”) as noted below. ASU 2020-04 Reference Rate Reform (Topic 848) In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848)”. Due to the potential discontinuance of the London Interbank Offered Rate (LIBOR), regulators have undertaken reference rate initiatives to identify alternative reference rates that are more observable or transaction based and less susceptible to manipulation. The ASU also provides optional expedients for contract modifications that replace a reference rate affected by reference rate reform. The guidance is effective as of March 12, 2020 through December 31, 2022. Wesbanco is assessing the impact of adopting the new guidance on the consolidated financial statements on an ongoing basis with no material impacts expected at this time.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	NOTE 2. EARNINGS PER COMMON SHARE Earnings per common share are calculated as follows: For the Three Months Ended March 31, (unaudited, in thousands, except shares and per share amounts) 2021 2020 Numerator for both basic and diluted earnings per common share: Net income available to common shareholders $ 70,584 $ 23,396 Denominator: Total average basic common shares outstanding 67,263,714 67,486,550 Effect of dilutive stock options and other stock compensation 91,704 100,896 Total diluted average common shares outstanding 67,355,418 67,587,446 Earnings per common share - basic $ 1.05 $ 0.35 Earnings per common share - diluted $ 1.05 $ 0.35 As of March 31, 2021 and 2020, respectively, As of March 31, 2021 and 2020, shares related to the 2020 and 2019 total shareholder return plans were not included in the calculation because the effect would be antidilutive. In addition, no performance-based restricted stock was estimated to be awarded as of March 31, 2021 and therefore, was not included in the diluted calculation. As of March 31, 2020, 25,618 shares were estimated to be awarded and those shares were included in the diluted calculation for the three months ended March 31, 2020.

Securities

Securities	3 Months Ended
	Mar. 31, 2021
Investments Debt And Equity Securities [Abstract]
Securities	NOTE 3. SECURITIES The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity debt securities: March 31, 2021 December 31, 2020 (unaudited, in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale debt securities U.S. Treasury $ 29,986 $ 11 $ — $ 29,997 $ 39,975 $ 7 $ — $ 39,982 U.S. Government sponsored entities and agencies 174,472 4,564 (2,706 ) 176,330 204,109 7,715 (142 ) 211,682 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 2,123,853 30,901 (13,961 ) 2,140,793 1,230,106 35,979 (1,348 ) 1,264,737 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 284,440 7,962 (721 ) 291,681 308,903 11,464 (269 ) 320,098 Obligations of states and political subdivisions 105,778 6,056 (36 ) 111,798 108,602 7,160 — 115,762 Corporate debt securities 23,953 660 — 24,613 24,963 912 — 25,875 Total available-for-sale debt securities $ 2,742,482 $ 50,154 $ (17,424 ) $ 2,775,212 $ 1,916,658 $ 63,237 $ (1,759 ) $ 1,978,136 Held-to-maturity debt securities U.S. Government sponsored entities and agencies $ 7,611 $ 106 $ — $ 7,717 $ 7,779 $ 265 $ — $ 8,044 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 80,376 2,738 (5 ) 83,109 89,151 3,251 — 92,402 Obligations of states and political subdivisions 692,616 24,501 (3,811 ) 713,306 601,128 30,173 (59 ) 631,242 Corporate debt securities 33,137 2,603 — 35,740 33,154 3,341 — 36,495 Total held-to-maturity debt securities $ 813,740 $ 29,948 $ (3,816 ) $ 839,872 $ 731,212 $ 37,030 $ (59 ) $ 768,183 Total debt securities $ 3,556,222 $ 80,102 $ (21,240 ) $ 3,615,084 $ 2,647,870 $ 100,267 $ (1,818 ) $ 2,746,319 (1) Total held-to-maturity debt securities are presented on the balance sheet net of their allowance for credit losses totaling $0.3 million at March 31, 2021 and December 31, 2020. At March 31, 2021 and December 31, 2020, there were no holdings of any one issuer, other than U.S. government sponsored entities and its agencies, in an amount greater than 10% of Wesbanco’s shareholders’ equity. Equity securities, of which $10.1 million consist of investments in various mutual funds held in grantor trusts formed in connection with the Company’s deferred compensation plan, are recorded at fair value, and totaled $13.1 million and $13.0 million at March 31, 2021 and December 31, 2020, respectively. The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity debt securities by contractual maturity date at March 31, 2021. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay debt obligations with or without prepayment penalties. Mortgage-backed securities and collateralized mortgage obligations are classified in the table below based on their contractual maturity date; however, regular principal payments and prepayments of principal are received on a monthly basis. (unaudited, in thousands) Amortized Cost Fair Value Available-for-sale debt securities Less than one year $ 47,465 $ 47,583 1-5 years 145,739 152,800 5-10 years 358,854 366,119 Over 10 years 2,190,424 2,208,710 Total available-for-sale debt securities $ 2,742,482 $ 2,775,212 Held-to-maturity debt securities Less than one year $ 11,759 $ 11,872 1-5 years 133,053 140,315 5-10 years 228,148 237,907 Over 10 years 440,780 449,778 Total held-to-maturity debt securities $ 813,740 $ 839,872 Total debt securities $ 3,556,222 $ 3,615,084 Securities with an aggregate fair value of $1.8 billion at March 31, 2021 and December 31, 2020, respectively, were pledged as security for public and trust funds, and securities sold under agreements to repurchase. Proceeds from the sale of available-for-sale securities were $0 million and $222.7 million for the three months ended March 31, 2021 and 2020, respectively. Net unrealized gains on available-for-sale securities included in accumulated other comprehensive income, net of tax, as of March 31, 2021 and December 31, 2020 were $24.8 million and $46.9 million, respectively. The following table presents the gross realized gains and losses on sales and calls of available-for-sale and held-to-maturity debt securities, as well as gains and losses on equity securities from both sales and market adjustments, for the three months ended March 31, 2021 and 2020, respectively. All gains and losses presented in the table below are included in the net securities gains (losses) line item of the income statement. For those equity securities relating to the key officer and director deferred compensation plan, the corresponding change in the obligation to the participant is recognized in employee benefits expense. For the Three Months Ended March 31, (unaudited, in thousands) 2021 2020 Debt securities: Gross realized gains $ 140 $ 3,335 Gross realized losses (39 ) (1,031 ) Net gains on debt securities $ 101 $ 2,304 Equity securities: Net unrealized gains (losses) recognized on securities still held $ 178 $ (805 ) Net realized losses recognized on securities sold — (8 ) Net gains (losses) on equity securities $ 178 $ (813 ) Net securities gains $ 279 $ 1,491 The corporate and municipal bonds in Wesbanco’s held-to-maturity debt portfolio are analyzed quarterly to determine if an allowance for current expected credit losses is warranted. Wesbanco uses a database of historical financials of all corporate and municipal issuers and actual historic default and recovery rates on rated and non-rated transactions to estimate expected credit losses on an individual security basis. The expected credit losses are adjusted quarterly and are recorded in an allowance for expected credit losses on the balance sheet, which is deducted from the amortized cost basis of the held-to-maturity portfolio as a contra asset. The losses are recorded on the income statement in the provision for credit losses. Accrued interest receivable on held-to-maturity securities, which was $6.3 million and $5.3 million as of March 31, 2021 and December 31, 2020, respectively, is excluded from the estimate of credit losses. Held-to-maturity investments in U.S. Government sponsored entities and agencies as well as mortgage-backed securities and collateralized mortgage obligations, which are all either issued by a direct governmental entity or a government-sponsored entity, have no historical evidence supporting expected credit losses; therefore, Wesbanco has estimated these losses at zero, and will monitor this assumption in the future for any economical or governmental policies that could affect this assumption. The following table provides a roll-forward of the allowance for credit losses on held-to-maturity securities for the three months ended March 31, 2021 and March 31, 2020, respectively: Allowance for Credit Losses By Category For the Three Months Ended March 31, 2021 and 2020 Residential mortgage -backed securities and collateralized mortgage obligations Obligations of U.S. Government of government state and Corporate sponsored sponsored entities political debt (unaudited, in thousands) entities and agencies and agencies subdivisions Securities Total Balance at December 31, 2020 $ — $ — $ 130 $ 196 $ 326 Current period provision — — (12 ) (24 ) (36 ) Write-offs — — — — — Recoveries — — — — — Balance at March 31, 2021 $ — $ — $ 118 $ 172 $ 290 . Balance at December 31, 2019 $ — $ — $ — $ — $ — Impact of adopting ASC 326 — — 96 133 229 Current period provision — — 2 5 7 Write-offs — — — — — Recoveries — — — — — Balance at March 31, 2020 $ — $ — $ 98 $ 138 $ 236 The following tables provide information on unrealized losses on available-for-sale debt securities that have been in an unrealized loss position for less than twelve months and twelve months or more, for which an allowance for credit losses has not been recorded, as of March 31, 2021 and December 31, 2020, respectively: March 31, 2021 Less than 12 months 12 months or more Total (unaudited, dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Government sponsored entities and agencies $ 56,270 $ (2,706 ) 6 $ — $ — — $ 56,270 $ (2,706 ) 6 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 973,961 (13,879 ) 98 3,531 (82 ) 4 977,492 (13,961 ) 102 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 94,186 (721 ) 9 — — — 94,186 (721 ) 9 Obligations of state and political subdivisions 3,767 (36 ) 1 — — — 3,767 (36 ) 1 Total $ 1,128,184 $ (17,342 ) 114 $ 3,531 $ (82 ) 4 $ 1,131,715 $ (17,424 ) $ 118 December 31, 2020 Less than 12 months 12 months or more Total (dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Government sponsored entities and agencies $ 18,308 $ (142 ) 2 $ — $ — — $ 18,308 $ (142 ) 2 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 224,448 (1,227 ) 41 4,136 (121 ) 3 228,584 (1,348 ) 44 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 97,266 (269 ) 10 — — — 97,266 (269 ) 10 Obligations of states and political subdivisions — — — — — — — — — Total $ 340,022 $ (1,638 ) 53 $ 4,136 $ (121 ) 3 $ 344,158 $ (1,759 ) 56 Unrealized losses on debt securities in the table above represents temporary fluctuations resulting from changes in market rates in relation to fixed yields. Unrealized losses in the available-for-sale portfolio are accounted for as an adjustment, net of taxes, to other comprehensive income in shareholders’ equity. Wesbanco does not believe the securities presented above are impaired due to reasons of credit quality, as substantially all debt securities are rated above investment grade and all are paying principal and interest according to their contractual terms. Wesbanco does not intend to sell, nor is it more likely than not that it will be required to sell, loss position securities prior to recovery of their cost; therefore, management believes the unrealized losses detailed above do not require an allowance for credit losses relating to these securities to be recognized. Securities that do not have readily determinable fair values and for which Wesbanco does not exercise significant influence are carried at cost. Cost method investments consist primarily of Federal Home Loan Bank (“FHLB”) of Pittsburgh and Indianapolis stock totaling $29.3 million and $34.0 million at March 31, 2021 and December 31, 2020, respectively, and are included in other assets in the Consolidated Balance Sheets. Cost method investments are evaluated for impairment whenever events or circumstances suggest that their carrying value may not be recoverable.

Loans and the Allowance for Cre

Loans and the Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Loans and the Allowance for Credit Losses	NOTE 4. LOANS AND THE ALLOWANCE FOR CREDIT LOSSES The recorded investment in loans is presented in the Consolidated Balance Sheets net of deferred loan fees and costs, and discounts on purchased loans. Net deferred loan income was $13.3 million and $6.2 million at March 31, 2021 and December 31, 2020, respectively. At March 31, 2021 and December 31, 2020, respectively, the balance included $21.4 and $13.8 million of net deferred income from PPP loans. The un-accreted discount on purchased loans from acquisitions was $35.9 million at March 31, 2021 and $39.4 million at December 31, 2020. March 31, December 31, (unaudited, in thousands) 2021 2020 Commercial real estate: Land and construction $ 642,017 $ 668,277 Improved property 5,070,725 5,037,115 Total commercial real estate 5,712,742 5,705,392 Commercial and industrial 1,598,921 1,681,182 Commercial and industrial - PPP 823,814 726,256 Residential real estate 1,644,422 1,720,961 Home equity 634,018 646,387 Consumer 289,395 309,055 Total portfolio loans 10,703,312 10,789,233 Loans held for sale 153,520 168,378 Total loans $ 10,856,832 $ 10,957,611 The allowance for credit losses under the current expected credit losses methodology (“CECL”) is calculated utilizing the PD / LGD, which is then discounted to net present value. PD is the probability the asset will default within a given time frame and LGD is the percentage of the asset not expected to be collected due to default. The primary macroeconomic drivers of the quantitative model include forecasts of national unemployment and interest rates, as well as modeling adjustments for changes in prepayment speeds, loan risk grades, portfolio mix, concentrations and loan growth. For the calculation as of March 31, 2021, the one-year forecast was based upon a blended rate from two nationally-recognized published economic forecasts through March 31, 2021, and is primarily driven by the national unemployment and interest rate spread forecasts. Wesbanco’s blended forecast of national unemployment, at quarter end, was projected to peak at 5.8% in the second quarter, and subsequently decrease to an average of 4.8% over the remainder of the forecast period. The calculation utilized a one-year The following tables summarize changes in the allowance for credit losses applicable to each category of the loan portfolio: Allowance for Credit Losses By Category For the Three Months Ended March 31, 2021 and 2020 (unaudited, in thousands) Commercial Real Estate - Land and Construction Commercial Real Estate- Improved Property Commercial & Industrial Residential Real Estate Home Equity Consumer Deposit Overdrafts Total Balance at December 31, 2020 Allowance for credit losses - loans $ 10,841 $ 110,652 $ 37,850 $ 17,851 $ 1,487 $ 6,507 $ 639 $ 185,827 Allowance for credit losses - loan commitments 6,508 712 1,275 955 45 19 — 9,514 Total beginning allowance for credit losses - loans and loan commitments 17,349 111,364 39,125 18,806 1,532 6,526 639 195,341 Provision for credit losses: Provision for loan losses (3,538 ) (11,420 ) (4,256 ) (4,177 ) (394 ) (1,510 ) 156 (25,139 ) Provision for loan commitments (2,508 ) (504 ) 308 (86 ) 5 2 — (2,783 ) Total provision for credit losses - loans and loan commitments (6,046 ) (11,924 ) (3,948 ) (4,263 ) (389 ) (1,508 ) 156 (27,922 ) Charge-offs (18 ) (19 ) (750 ) (371 ) (174 ) (927 ) (201 ) (2,460 ) Recoveries 55 528 440 135 79 462 113 1,812 Net charge-offs 37 509 (310 ) (236 ) (95 ) (465 ) (88 ) (648 ) Balance at March 31, 2021 Allowance for credit losses - loans 7,340 99,741 33,284 13,438 998 4,532 707 160,040 Allowance for credit losses - loan commitments 4,000 208 1,583 869 50 21 — 6,731 Total ending allowance for credit losses - loans and loan commitments $ 11,340 $ 99,949 $ 34,867 $ 14,307 $ 1,048 $ 4,553 $ 707 $ 166,771 Balance at December 31, 2019 Allowance for credit losses - loans $ 4,949 $ 20,293 $ 14,116 $ 4,311 $ 4,422 $ 2,951 $ 1,387 $ 52,429 Allowance for credit losses - loan commitments 235 22 311 15 250 41 — 874 Total beginning allowance for credit losses - loans and loan commitments 5,184 20,315 14,427 4,326 4,672 2,992 1,387 53,303 Impact of adopting ASC 326 1,524 13,078 22,357 5,630 (3,936 ) 2,576 213 41,442 Provision for credit losses: Provision for loan losses 2,564 20,585 5,632 237 646 (1,241 ) (351 ) 28,072 Provision for loan commitments 2,274 — (582 ) 49 2 — — 1,743 Total provision for credit losses - loans and loan commitments 4,838 20,585 5,050 286 648 (1,241 ) (351 ) 29,815 Charge-offs (1 ) (1,398 ) (2,714 ) (386 ) (443 ) (856 ) (328 ) (6,126 ) Recoveries 8 293 107 272 172 415 143 1,410 Net charge-offs 7 (1,105 ) (2,607 ) (114 ) (271 ) (441 ) (185 ) (4,716 ) Balance at March 31, 2020 Allowance for credit losses - loans 6,442 52,873 39,227 9,684 1,096 3,886 1,064 114,272 Allowance for credit losses - loan commitments 5,111 — — 444 17 — — 5,572 Total ending allowance for credit losses - loans and loan commitments $ 11,553 $ 52,873 $ 39,227 $ 10,128 $ 1,113 $ 3,886 $ 1,064 $ 119,844 The following tables present the allowance for credit losses and recorded investments in loans by category, as of each period-end: Allowance for Credit Losses and Recorded Investment in Loans (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial and Industrial Residential Real Estate Home Equity Consumer Deposit Over- drafts Total March 31, 2021 Allowance for credit losses: Loans individually-evaluated $ 503 $ 4,035 $ 1,501 $ — $ — $ — $ — $ 6,039 Loans collectively-evaluated 6,837 95,706 31,783 13,438 998 4,532 707 154,001 Loan commitments 4,000 208 1,583 869 50 21 — 6,731 Total allowance for credit losses - loans and commitments $ 11,340 $ 99,949 $ 34,867 $ 14,307 $ 1,048 $ 4,553 $ 707 $ 166,771 Portfolio loans: Individually-evaluated for credit losses (1) $ 1,125 $ 40,158 $ 1,838 $ — $ — $ — $ — $ 43,121 Collectively-evaluated for credit losses 640,892 5,030,567 2,420,897 1,644,422 634,018 289,395 — 10,660,191 Total portfolio loans $ 642,017 $ 5,070,725 $ 2,422,735 $ 1,644,422 $ 634,018 $ 289,395 $ — $ 10,703,312 December 31, 2020 Allowance for credit losses: Loans individually-evaluated $ 602 $ 4,196 $ 1,484 $ — $ — $ — $ — $ 6,282 Loans collectively-evaluated 10,239 106,456 36,366 17,851 1,487 6,507 639 179,545 Loan commitments 6,508 712 1,275 955 45 19 — 9,514 Total allowance for credit losses - loans and commitments $ 17,349 $ 111,364 $ 39,125 $ 18,806 $ 1,532 $ 6,526 $ 639 $ 195,341 Portfolio loans: Individually-evaluated for credit losses (1) $ 1,455 $ 40,372 $ 2,863 $ — $ — $ — $ — $ 44,690 Collectively-evaluated for credit losses 666,822 4,996,743 2,404,575 1,720,961 646,387 309,055 — 10,744,543 Total portfolio loans $ 668,277 $ 5,037,115 $ 2,407,438 $ 1,720,961 $ 646,387 $ 309,055 $ — $ 10,789,233 (1 ) Commercial loan risk grades are determined based on an evaluation of the relevant characteristics of each loan, assigned at inception and adjusted thereafter at any time to reflect changes in the risk profile throughout the life of each loan. The primary factors used to determine the risk grade are the sufficiency, reliability and sustainability of the primary source of repayment and overall financial strength of the borrower. The rating system more heavily weights the debt service coverage, leverage and loan to value factors to derive the risk grade. Other factors that are considered at a lesser weighting include management, industry or property type risks, payment history, collateral or guarantees. Commercial real estate – land and construction consists of loans to finance investments in vacant land, land development, construction of residential housing, and construction of commercial buildings. Commercial real estate – improved property consists of loans for the purchase or refinance of all types of improved owner-occupied and investment properties. Factors that are considered in assigning the risk grade vary depending on the type of property financed. The risk grade assigned to construction and development loans is based on the overall viability of the project, the experience and financial capacity of the developer or builder to successfully complete the project, project specific and market absorption rates and comparable property values, and the amount of pre-sales for residential housing construction or pre-leases for commercial investment property. The risk grade assigned to commercial investment property loans is based primarily on the adequacy of the net operating income generated by the property to service the debt (“debt service coverage”), the loan to appraised value, the type, quality, industry and mix of tenants, and the terms of leases. The risk grade assigned to owner-occupied commercial real estate is based primarily on global debt service coverage and the leverage of the business, but may also consider the industry in which the business operates, the business’ specific competitive advantages or disadvantages, collateral margins and the quality and experience of management. Commercial and industrial (“C&I”) loans consist of revolving lines of credit to finance accounts receivable, inventory and other general business purposes; term loans to finance fixed assets other than real estate, and letters of credit to support trade, insurance or governmental requirements for a variety of businesses. Most C&I borrowers are privately-held companies with annual sales up to $100 million. Primary factors that are considered in risk rating C&I loans include debt service coverage and leverage. Other factors including operating trends, collateral coverage along with management experience are also considered. Pass loans are those that exhibit a history of positive financial results that are at least comparable to the average for their industry or type of real estate. The primary source of repayment is acceptable and these loans are expected to perform satisfactorily during most economic cycles. Pass loans typically have no significant external factors that are expected to adversely affect these borrowers more than others in the same industry or property type. Any minor unfavorable characteristics of these loans are outweighed or mitigated by other positive factors including but not limited to adequate secondary or tertiary sources of repayment. Criticized loans, considered as compromised, have potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the bank's credit position at some future date. Criticized loans are not adversely classified by the banking regulators and do not expose the bank to sufficient risk to warrant adverse classification. Classified loans, considered as substandard and doubtful, are equivalent to the classifications used by banking regulators. Substandard loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the bank will sustain some loss if the deficiencies are not corrected. These loans may or may not be reported as non-accrual. Doubtful loans have all the weaknesses inherent in those classified substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions, and values, highly questionable and improbable. These loans are reported as non-accrual. The following tables summarize commercial loans by their assigned risk grade: Commercial Loans by Internally Assigned Risk Grade (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial & Industrial Total Commercial Loans As of March 31, 2021 Pass $ 634,835 $ 4,679,257 $ 2,365,558 $ 7,679,650 Criticized - compromised 5,360 297,801 37,782 340,943 Classified - substandard 1,822 93,667 19,395 114,884 Classified - doubtful — — — — Total $ 642,017 $ 5,070,725 $ 2,422,735 $ 8,135,477 As of December 31, 2020 Pass $ 657,435 $ 4,609,726 $ 2,350,724 $ 7,617,885 Criticized - compromised 7,397 320,301 34,597 362,295 Classified - substandard 3,445 107,088 22,117 132,650 Classified - doubtful — — — — Total $ 668,277 $ 5,037,115 $ 2,407,438 $ 8,112,830 Residential real estate, home equity and consumer loans are not assigned internal risk grades other than as required by regulatory guidelines that are based primarily on the age of past due loans. Wesbanco primarily evaluates the credit quality of residential real estate, home equity and consumer loans based on repayment performance and historical loss rates. The aggregate amount of residential real estate, home equity and consumer loans classified as substandard in accordance with regulatory guidelines was $29.4 million at March 31, 2021 and $27.7 million at December 31, 2020, of which $5.5 million and $4.1 million were accruing, for each period, respectively. The aggregate amount of residential real estate, home equity and consumer loans classified as substandard, as well as $28.3 million and $28.7 million of unfunded commercial loan commitments are not included in the tables above at March 31, 2021 and December 31, 2020, respectively. The following tables summarize the age analysis of all categories of loans: Age Analysis of Loans (unaudited, in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Total Past Due Total Loans 90 Days or More Past Accruing (1) As of March 31, 2021 Commercial real estate: Land and construction $ 639,378 $ 1,120 $ 759 $ 760 $ 2,639 $ 642,017 $ 641 Improved property 5,055,419 4,041 1,984 9,281 15,306 5,070,725 1,955 Total commercial real estate 5,694,797 5,161 2,743 10,041 17,945 5,712,742 2,596 Commercial and industrial 2,408,663 4,823 2,657 6,592 14,072 2,422,735 5,314 Residential real estate 1,625,328 2,713 1,589 14,792 19,094 1,644,422 4,007 Home equity 628,773 1,213 197 3,835 5,245 634,018 784 Consumer 287,395 1,428 340 232 2,000 289,395 123 Total portfolio loans 10,644,956 15,338 7,526 35,492 58,356 10,703,312 12,824 Loans held for sale 153,520 — — — — 153,520 — Total loans $ 10,798,476 $ 15,338 $ 7,526 $ 35,492 $ 58,356 $ 10,856,832 $ 12,824 Nonperforming loans included above are as follows: Non-accrual loans $ 9,960 $ 940 $ 1,100 $ 22,575 $ 24,615 $ 34,575 TDRs accruing interest (1) 3,248 63 159 93 315 3,563 Total nonperforming loans $ 13,208 $ 1,003 $ 1,259 $ 22,668 $ 24,930 $ 38,138 As of December 31, 2020 Commercial real estate: Land and construction $ 664,990 $ 582 $ 2,276 $ 429 $ 3,287 $ 668,277 $ 288 Improved property 5,016,812 4,876 4,118 11,309 20,303 5,037,115 2,713 Total commercial real estate 5,681,802 5,458 6,394 11,738 23,590 5,705,392 3,001 Commercial and industrial 2,395,844 4,372 2,197 5,025 11,594 2,407,438 1,899 Residential real estate 1,698,636 2,614 5,654 14,057 22,325 1,720,961 2,863 Home equity 639,319 2,414 775 3,879 7,068 646,387 706 Consumer 305,483 1,998 1,031 543 3,572 309,055 377 Total portfolio loans 10,721,084 16,856 16,051 35,242 68,149 10,789,233 8,846 Loans held for sale 168,378 — — — — 168,378 — Total loans $ 10,889,462 $ 16,856 $ 16,051 $ 35,242 $ 68,149 $ 10,957,611 $ 8,846 Nonperforming loans included above are as follows: Non-accrual loans $ 9,560 $ 630 $ 466 $ 26,224 $ 27,320 $ 36,880 TDRs accruing interest (1) 3,540 63 152 172 387 3,927 Total nonperforming loans $ 13,100 $ 693 $ 618 $ 26,396 $ 27,707 $ 40,807 (1) Loans 90 days or more past due and accruing interest exclude TDRs 90 days or more past due and accruing interest. The following tables summarize nonperforming loans: Nonperforming Loans March 31, 2021 December 31, 2020 Unpaid Unpaid Principal Recorded Related Principal Recorded Related (unaudited, in thousands) Balance (1) Investment Allowance Balance (1) Investment Allowance With no related specific allowance recorded: Commercial real estate: Land and construction $ 138 $ 120 $ — $ 469 $ 469 $ — Improved property 8,719 7,349 — 9,597 8,055 — Commercial and industrial 1,860 1,675 — 4,401 3,413 — Residential real estate 23,605 20,990 — 23,055 20,704 — Home equity 6,518 5,569 — 6,635 5,708 — Consumer 593 351 — 602 364 — Total nonperforming loans without a specific allowance 41,433 36,054 — 44,759 38,713 — With a specific allowance recorded: Commercial real estate: Land and construction — — — — — — Improved property 2,094 2,084 175 2,094 2,094 136 Commercial and industrial — — — — — — Residential real estate — — — — — — Home equity — — — — — — Consumer — — — — — — Total nonperforming loans with a specific allowance 2,094 2,084 175 2,094 2,094 136 Total nonperforming loans $ 43,527 $ 38,138 $ 175 $ 46,853 $ 40,807 $ 136 (1) Nonperforming Loans For the Three Months Ended March 31, 2021 March 31, 2020 Average Interest Average Interest Recorded Income Recorded Income (unaudited, in thousands) Investment Recognized Investment Recognized With no related specific allowance recorded: Commercial real estate: Land and construction $ 295 $ — $ 393 $ — Improved property 7,702 9 5,501 20 Commercial and industrial 2,544 1 8,570 3 Residential real estate 20,847 39 18,470 55 Home equity 5,639 6 5,811 6 Consumer 358 — 390 1 Total nonperforming loans without a specific allowance 37,385 55 39,135 85 With a specific allowance recorded: Commercial real estate: Land and construction — — — — Improved property 2,089 — 3,270 — Commercial and industrial — — 96 — Residential real estate — — 2,196 — Home equity — — 352 — Consumer — — 27 — Total nonperforming loans with a specific allowance 2,089 — 5,941 — Total nonperforming loans $ 39,474 $ 55 $ 45,076 $ 85 The following tables present the recorded investment in non-accrual loans and TDRs: Non-accrual Loans (1) March 31, December 31, (unaudited, in thousands) 2021 2020 Commercial real estate: Land and construction $ 120 $ 469 Improved property 9,007 9,494 Total commercial real estate 9,127 9,963 Commercial and industrial 1,571 3,302 Residential real estate 18,358 17,925 Home equity 5,181 5,345 Consumer 338 345 Total $ 34,575 $ 36,880 (1) At March 31, 2021 and December 31, 2020, there was one borrower with a loan balance greater than $1.0 million totaling $2.1 million. Total non-accrual loans include loans that are also restructured. Such loans are also set forth in the following table as non-accrual TDRs. TDRs March 31, 2021 December 31, 2020 (unaudited, in thousands) Accruing Non-Accrual Total Accruing Non-Accrual Total Commercial real estate: Land and construction $ — $ — $ — $ — $ — $ — Improved property 426 157 583 655 165 820 Total commercial real estate 426 157 583 655 165 820 Commercial and industrial 104 — 104 111 — 111 Residential real estate 2,632 1,353 3,985 2,779 1,354 4,133 Home equity 388 253 641 363 300 663 Consumer 13 5 18 19 9 28 Total $ 3,563 $ 1,768 $ 5,331 $ 3,927 $ 1,828 $ 5,755 As of March 31, 2021 and December 31, 2020, there were no TDRs greater than $1.0 million. The concessions granted in the majority of loans reported as accruing and non-accrual TDRs are extensions of the maturity date or the amortization period, reductions in the interest rate below the prevailing market rate for loans with comparable characteristics, and/or permitting interest-only payments for longer than six months. Wesbanco had unfunded commitments to debtors whose loans were classified as nonperforming of $0.9 million as of March 31, 2021 and December 31, 2020. The following tables present details related to loans identified as TDRs during the three months ended March 31, 2021 and 2020, respectively: New TDRs (1) For the Three Months Ended March 31, 2021 March 31, 2020 Pre- Post- Pre- Post- Modification Modification Modification Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded (unaudited, dollars in thousands) Modifications Investment Investment Modifications Investment Investment Commercial real estate: Land and construction — $ — $ — — $ — $ — Improved Property — — — — — — Total commercial real estate — — — — — — Commercial and industrial — — — — — — Residential real estate — — — 2 332 330 Home equity — — — — — — Consumer — — — — — — Total — $ — $ — 2 $ 332 $ 330 (1) Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end. The following table summarizes TDRs which defaulted (defined as past due 90 days) during the three months ended March 31, 2021 and 2020, respectively, that were restructured within the last twelve months prior to March 31, 2021 and 2020, respectively: Defaulted TDRs (1) For the Three Months Ended March 31, 2021 March 31, 2020 Number of Recorded Number of Recorded (unaudited, dollars in thousands) Defaults Investment Defaults Investment Commercial real estate: Land and construction — $ — — $ — Improved property — — — — Total commercial real estate — — — — Commercial and industrial — — 1 13 Residential real estate — — 1 155 Home equity — — — — Consumer — — — — Total — $ — 2 $ 168 (1) TDRs that default are placed on non-accrual status unless they are both well-secured and in the process of collection. The loans in the table above were not accruing interest. Section 4013 of the CARES Act allows financial institutions the option to temporarily suspend certain requirements under U.S. GAAP related to TDRs for a limited period of time during the COVID-19 pandemic. These customers must meet certain criteria, such as they were in good standing and not more than 30 days past due either as of December 31, 2019, or as of the implementation of the modification program under the Interagency Statement, as well as other requirements noted in the regulatory agencies’ revised statement. Based on this guidance, Wesbanco does not classify the COVID-19 loan modifications as TDRs, nor are the customers considered past due with regard to their delayed payments. Upon exiting the loan modification deferral program, the measurement of loan delinquency will resume where it left off upon entry into the program. Under the CARES Act, Wesbanco has modified approximately 3,553 loans totaling $2.2 billion, of which $0.2 billion remain in their deferral period as of March 31, 2021. Wesbanco originally offered three to six months of deferred payments to commercial and retail customers impacted by the COVID-19 pandemic depending on the type of loan and the industry for commercial loans. In the fourth quarter of 2020, Wesbanco offered up to an additional twelve months of deferred payments to certain commercial loan customers, predominantly in the hospitality industry, based on specific criteria related to the borrower, the underlying property and the potential for guarantors / co-borrowers. On December 27, 2020, the Economic Aid to Hard-Hit Small Businesses, Nonprofits and Venues Act (“Economic Aid Act”) was signed into law and among other things, extended the relief granted by the CARES Act for TDRs, initially slated to end on December 31, 2020, by one year to December 31, 2021. The following table s summarize amortized cost basis loan balances by year of origination and credit quality indicator: Loans As of March 31, 2021 Amortized Cost Basis by Origination Year (unaudited, in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: land and construction Risk rating: Pass $ 30,840 $ 164,939 $ 296,600 $ 49,749 $ 27,064 $ 43,143 $ 22,500 $ — $ 634,835 Criticized - compromised — 875 — 39 228 3,618 600 — 5,360 Classified - substandard — — — 74 40 1,708 — — 1,822 Classified - doubtful — — — — — — — — — Total $ 30,840 $ 165,814 $ 296,600 $ 49,862 $ 27,332 $ 48,469 $ 23,100 $ — $ 642,017 Commercial real estate: improved property Risk rating: Pass $ 156,789 $ 787,296 $ 690,398 $ 639,915 $ 472,801 $ 1,864,909 $ 67,149 $ — $ 4,679,257 Criticized - compromised — 1,892 53,807 17,473 53,576 150,704 20,349 — 297,801 Classified - substandard — 222 28,603 1,860 7,171 55,811 — — 93,667 Classified - doubtful — — — — — — — — — Total $ 156,789 $ 789,410 $ 772,808 $ 659,248 $ 533,548 $ 2,071,424 $ 87,498 $ — $ 5,070,725 Commercial and industrial Risk rating: Pass $ 401,323 $ 685,632 $ 232,322 $ 185,484 $ 135,856 $ 320,788 $ 404,023 $ 130 $ 2,365,558 Criticized - compromised 26 3,290 2,746 4,236 2,651 10,841 13,992 — 37,782 Classified - substandard 985 — 2,518 1,668 3,567 5,179 5,478 — 19,395 Classified - doubtful — — — — — — — — — Total $ 402,334 $ 688,922 $ 237,586 $ 191,388 $ 142,074 $ 336,808 $ 423,493 $ 130 $ 2,422,735 Residential real estate Loan delinquency: Current $ 66,997 $ 392,577 $ 209,234 $ 130,435 $ 94,237 $ 731,848 $ — $ — $ 1,625,328 30-59 days past due — — — 79 — 2,634 — — 2,713 60-89 days past due — — — 272 113 1,204 — — 1,589 90 days or more past due — — 379 784 761 12,868 — — 14,792 Total $ 66,997 $ 392,577 $ 209,613 $ 131,570 $ 95,111 $ 748,554 $ — $ — $ 1,644,422 Home equity Loan delinquency: Current $ 4,724 $ 15,055 $ 3,290 $ 2,959 $ 857 $ 16,995 $ 573,653 $ 11,240 $ 628,773 30-59 days past due — — — — — 400 783 30 1,213 60-89 days past due — — — — — 121 76 — 197 90 days or more past due — — — 19 150 1,565 1,355 746 3,835 Total $ 4,724 $ 15,055 $ 3,290 $ 2,978 $ 1,007 $ 19,081 $ 575,867 $ 12,016 $ 634,018 Consumer Loan delinquency: Current $ 18,121 $ 65,802 $ 79,045 $ 33,586 $ 18,773 $ 51,313 $ 20,589 $ 166 $ 287,395 30-59 days past due 37 444 413 68 114 352 — — 1,428 60-89 days past due — 45 50 31 64 148 2 — 340 90 days or more past due — 8 — 54 29 125 16 — 232 Total $ 18,158 $ 66,299 $ 79,508 $ 33,739 $ 18,980 $ 51,938 $ 20,607 $ 166 $ 289,395 Loans As of December 31, 2020 Amortized Cost Basis by Origination Year (unaudited, in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: land and construction Risk rating: Pass $ 133,720 $ 314,614 $ 109,232 $ 27,483 $ 16,404 $ 29,685 $ 26,297 $ — $ 657,435 Criticized - compromised 459 — 1,532 233 79 3,778 1,316 — 7,397 Classified - substandard — — 403 58 291 2,693 — — 3,445 Classified - doubtful — — — — — — — — — Total $ 134,179 $ 314,614 $ 111,167 $ 27,774 $ 16,774 $ 36,156 $ 27,613 $ — $ 668,277 Commercial real estate: improved property Risk rating: Pass $ 809,516 $ 670,554 $ 646,629 $ 474,622 $ 572,733 $ 1,346,552 $ 89,120 $ — $ 4,609,726 Criticized - compromised 2,693 67,261 16,793 59,251 42,284 130,247 1,772 — 320,301 Classified - substandard 102 16,366 4,946 11,647 18,460 55,567 — — 107,088 Classified - doubtful — — — — — — — — — Total $ 812,311 $ 754,181 $ 668,368 $ 545,520 $ 633,477 $ 1,532,366 $ 90,892 $ — $ 5,037,115 Commercial and industrial Risk rating: Pass $ 977,085 $ 240,262 $ 193,712 $ 160,924 $ 85,379 $ 265,890 $ 427,336 $ 136 $ 2,350,724 Criticized - compromised 453 2,726 4,206 2,795 324 11,640 12,453 — 34,597 Classified - substandard — 3,817 1,947 3,771 1,603 5,073 5,906 — 22,117 Classified - doubtful — — — — — — — — — Total $ 977,538 $ 246,805 $ 199,865 $ 167,490 $ 87,306 $ 282,603 $ 445,695 $ 136 $ 2,407,438 Residential real estate Loan delinquency: Current $ 385,541 $ 242,770 $ 149,603 $ 108,090 $ 170,967 $ 641,665 $ — $ — $ 1,698,636 30-59 days past due — — 320 533 — 1,761 — — 2,614 60-89 days past due — — 823 — 185 4,646 — — 5,654 90 days or more past due — 483 166 761 819 11,828 — — 14,057 Total $ 385,541 $ 243,253 $ 150,912 $ 109,384 $ 171,971 $ 659,900 $ — $ — $ 1,720,961 Home equity Loan delinquency: Current $ 18,191 $ 3,611 $ 3,334 $ 975 $ 1,110 $ 16,477 $ 583,486 $ 12,135 $ 639,319 30-59 days past due 124 — 34 — — 882 1,247 127 2,414 60-89 days past due — — — — — 14 749 12 775 90 days or more past due — — 8 156 88 1,786 1,075 766 3,879 Total $ 18,315 $ 3,611 $ 3,376 $ 1,131 $ 1,198 $ 19,159 $ 586,557 $ 13,040 $ 646,387 Consumer Loan delinquency: Current $ 72,847 $ 89,637 $ 39,584 $ 22,118 $ 13,144 $ 45,735 $ 22,253 $ 165 $ 305,483 30-59 days past due 481 408 210 311 194 379 15 — 1,998 60-89 days past due 273 147 84 100 163 253 11 — 1,031 90 days or more past due 113 72 73 31 12 242 — — 543 Total $ 73,714 $ 90,264 $ 39,951 $ 22,560 $ 13,513 $ 46,609 $ 22,279 $ 165 $ 309,055 The following table summarizes other real estate owned and repossessed assets included in other assets: March 31, December 31, (unaudited, in thousands) 2021 2020 Other real estate owned $ 375 $ 504 Repossessed assets 18 45 Total other real estate owned and repossessed assets $ 393 $ 549 Residential real estate included in

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	NOTE 5. DERIVATIVES AND HEDGING ACTIVITIES Risk Management Objective of Using Derivatives Wesbanco is exposed to certain risks arising from both its business operations and economic conditions. Wesbanco principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. Wesbanco manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities. Wesbanco’s existing interest rate derivatives result from a service provided to certain qualifying customers and, therefore, are not used to manage interest rate risk in Wesbanco’s assets or liabilities. Wesbanco manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions. A matched book is when Wesbanco Bank, Inc.’s (the “Bank”) assets and liabilities are equally distributed but also have similar maturities. Loan Swaps Wesbanco executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that Wesbanco executes with a third party, such that Wesbanco minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements of ASC 815, changes in the fair value of both the customer swaps and the offsetting third-party swaps are recognized directly in earnings. As of March 31, 2021 and December 31, 2020, Wesbanco had 122 and 112, respectively, customer interest rate swaps with an aggregate notional amount of $711.0 million and $649.9 million, respectively, related to this program. During the three months ended March 31, 2021 and 2020, Wesbanco recognized net gains (losses) of $2.8 million and $(2.8) million, respectively, related to the changes in fair value of these swaps. Additionally, Wesbanco recognized $1.9 million and $2.6 million of income for the related swap fees for the three months ended March 31, 2021 and 2020, respectively. Risk participation agreements are entered into as financial guarantees of performance on interest rate swap derivatives. The purchased asset or sold liability allows Wesbanco to participate-in (fee received) or participate-out (fee paid) the risk associated with certain derivative positions executed by the borrower by the lead bank in a loan syndication. As of March 31, 2021 and December 31, 2020, Wesbanco had 13 and 12, respectively, risk participation-in agreements with an aggregate notional amount of $119.2 million and $101.1 million, respectively. As of March 31, 2021 and December 31, 2020, Wesbanco had one risk participation-out agreement with an aggregate notional amount of $10.0 million. Mortgage Loans Held for Sale and Loan Commitments Certain residential mortgage loans are originated for sale in the secondary mortgage loan market. These loans are classified as held for sale and carried at fair value as Wesbanco has elected the fair value option. Fair value is determined based on rates obtained from the secondary market for loans with similar characteristics. Wesbanco sells loans to the secondary market on either a mandatory or best efforts basis. The loans sold on a mandatory basis are not committed to an investor until the loan is closed with the borrower. Wesbanco enters into forward to be announced (“TBA”) contracts to manage the interest rate risk between the loan commitment and the closing of the loan. The total balance of forward TBA contracts entered into was $197.0 million and $183.5 million at March 31, 2021 and December 31, 2020, respectively. Additionally, Wesbanco recognized gains (losses) of $4.5 million and $(2.7) million, respectively, for the three months ended March 31, 2021 and 2020 related to the changes in fair value of these contracts. The loans sold on a best efforts basis are committed to an investor simultaneous to the interest rate commitment with the borrower, and as a result, the Company does not enter into a separate forward TBA contract to offset the fair value risk as the investor accepts such risk in exchange for a lower premium on sale. Fair Values of Derivative Instruments on the Balance Sheet All derivatives are carried on the consolidated balance sheet at fair value. Derivative assets are classified in the consolidated balance sheet under other assets, and derivative liabilities are classified in the consolidated balance sheet under other liabilities. Changes in fair value are recognized in earnings. None of Wesbanco’s derivatives are designated in a qualifying hedging relationship under ASC 815. The table below presents the fair value of Wesbanco’s derivative financial instruments as well as their classification on the Balance Sheet as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 (unaudited, in thousands) Notional or Contractual Amount Asset Derivatives Liability Derivatives Notional or Contractual Amount Asset Derivatives Liability Derivatives Derivatives Loan Swaps: Interest rate swaps $ 710,986 $ 31,732 $ 32,470 $ 649,857 $ 46,418 $ 49,917 Other contracts: Interest rate loan commitments 85,435 — 314 112,119 702 — Forward TBA contracts 197,000 1,515 — 183,500 — 1,161 Total derivatives $ 33,247 $ 32,784 $ 47,120 $ 51,078 Effect of Derivative Instruments on the Income Statement The table below presents the change in the fair value of the Company’s derivative financial instruments reflected within non-interest income on the consolidated income statement for the three months ended March 31, 2021 and 2020, respectively. For the Three Months Ended March 31, (unaudited, in thousands) Location of Gain/(Loss) 2021 2020 Interest rate swaps Other income $ 2,761 $ (2,751 ) Interest rate loan commitments Mortgage banking income (1,016 ) (145 ) Forward TBA contracts Mortgage banking income 4,518 (2,657 ) Total $ 6,263 $ (5,553 ) Credit-risk-related Contingent Features Wesbanco has agreements with its derivative counterparties that contain a provision, which provides that if Wesbanco defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Wesbanco could also be declared in default on its derivative obligations. Wesbanco also has agreements with certain of its derivative counterparties that contain a provision where if Wesbanco fails to maintain its status as either a “well” or “adequately-capitalized” institution, then the counterparty could terminate the derivative positions and Wesbanco would be required to settle its obligations under the agreements. Wesbanco had minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral with a market value of $54.2 million as of March 31, 2021. If Wesbanco had breached any of these provisions at March 31, 2021, it could have been required to settle its obligations under the agreements at the termination value and would have been required to pay any additional amounts due in excess of amounts previously posted as collateral with the respective counterparty.

Benefit Plans

Benefit Plans	3 Months Ended
	Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]
Benefit Plans	NOTE 6. BENEFIT PLANS The following table presents the net periodic pension cost for Wesbanco’s Defined Benefit Pension Plan (the “Plan”) and the related components: For the Three Months Ended March 31, (unaudited, in thousands) 2021 2020 Service cost – benefits earned during year $ 616 $ 568 Interest cost on projected benefit obligation 842 1,121 Expected return on plan assets (2,763 ) (2,594 ) Amortization of prior service cost (8 ) (9 ) Amortization of net loss 675 793 Net periodic pension income $ (638 ) $ (121 ) The service cost of $0.6 million for both the three months ended March 31, 2021 and 2020 is included in salaries and wages, and the periodic pension income of $1.3 million and $0.7 million for the three months ended March 31, 2021 and 2020, respectively, is included in employee benefits. The Plan covers all employees of Wesbanco and its subsidiaries who were hired on or before August 1, 2007 who satisfy minimum age and length of service requirements, and is not available to employees hired after such date. A minimum required contribution of $5.2

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurement	NOTE 7. FAIR VALUE MEASUREMENT Fair value estimates are based on quoted market prices, if available, quoted market prices of similar assets or liabilities, or the present value of expected future cash flows and other valuation techniques. These valuations are significantly affected by discount rates, cash flow assumptions, and risk assumptions used. Therefore, fair value estimates may not be substantiated by comparison to independent markets and are not intended to reflect the proceeds that may be realizable in an immediate settlement of the instruments. Fair value is determined at one point in time and is not representative of future value. These amounts do not reflect the total value of a going concern organization. Management does not have the intention to dispose of a significant portion of its assets and liabilities, and therefore the unrealized gains or losses should not be interpreted as a forecast of future earnings and cash flows. The following is a discussion of assets and liabilities measured at fair value on a recurring basis and valuation techniques applied: Investment securities: The fair value of investment securities which are measured on a recurring basis are determined primarily by obtaining quoted prices on nationally recognized securities exchanges or matrix pricing, which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other similar securities. These securities are classified within level 1 or 2 in the fair value hierarchy. Positions that are not traded in active markets for which valuations are generated using assumptions not observable in the market or management’s best estimate are classified within level 3 of the fair value hierarchy. This includes certain specific municipal debt issues for which the credit quality and discount rate must be estimated. Loans held for sale: Loans held for sale are carried, in aggregate, at fair value as Wesbanco previously elected the fair value option. The use of a valuation model using quoted prices of similar instruments are significant inputs in arriving at the fair value and therefore loans held for sale are classified within level 2 of the fair value hierarchy. Derivatives: Wesbanco enters into interest rate swap agreements with qualifying commercial customers to meet their financing, interest rate and other risk management needs. These agreements provide the customer the ability to convert from variable to fixed interest rates. The credit risk associated with derivatives executed with customers is essentially the same as that involved in extending loans and is subject to normal credit policies and monitoring. Those interest rate swaps are economically hedged by offsetting interest rate swaps that Wesbanco executes with derivative counterparties in order to offset its exposure on the fixed components of the customer interest rate swap agreements. The interest rate swap agreement with the loan customer and with the counterparty is reported at fair value in other assets and other liabilities on the consolidated balance sheet with any resulting gain or loss recorded in current period earnings as other income and other expense. Wesbanco enters into forward TBA contracts to manage the interest rate risk between the loan commitments to the customer and the closing of the loan for loans that will be sold on a mandatory basis to secondary market investors. The forward TBA contract is reported at fair value in other assets and other liabilities on the consolidated balance sheet with any resulting gain or loss recorded in current period’s earnings as mortgage banking income. Wesbanco determines the fair value for derivatives using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. Wesbanco incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. We may be required from time to time to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower of cost or market accounting or write-downs of individual assets and liabilities. Individually-evaluated nonperforming loans: Individually-evaluated non-performing loans are carried at the amortized cost basis less the specific allowance calculated with the CECL. Since these loans are nonperforming, cash flows could not be estimated and thus are calculated using a cost basis approach or collateral value approach. Other real estate owned and repossessed assets: Other real estate owned and repossessed assets are carried at the lower of the investment in the assets or the fair value of the assets less estimated selling costs. The use of independent appraisals and management’s best judgment are significant inputs in arriving at the fair value measure of the underlying collateral, and therefore other real estate owned and repossessed assets are classified within level 3 of the fair value hierarchy. The fair value amounts presented in the table below are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The following tables set forth Wesbanco ’s financial assets and liabilities that were accounted for at fair value on a recurring and nonrecurring basis by level within the fair valu e hierarchy as of March 31, 2021 and December 31, 2020 : March 31, 2021 Fair Value Measurements Using: March 31, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (unaudited, in thousands) 2021 (level 1) (level 2) (level 3) Recurring fair value measurements Equity securities $ 13,123 $ 13,123 $ — $ — Available-for-sale debt securities U.S. Treasury 29,997 — 29,997 — U.S. Government sponsored entities and agencies 176,330 — 176,330 — Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 2,140,793 — 2,140,793 — Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 291,681 — 291,681 — Obligations of states and political subdivisions 111,798 — 110,287 1,511 Corporate debt securities 24,613 — 24,613 — Total available-for-sale debt securities $ 2,775,212 $ — $ 2,773,701 $ 1,511 Loans held for sale 153,520 — 153,520 — Other assets - interest rate derivatives agreements 31,732 — 31,732 — Total assets recurring fair value measurements $ 2,973,587 $ 13,123 $ 2,958,953 $ 1,511 Other liabilities - interest rate derivatives agreements $ 32,470 $ — $ 32,470 $ — Total liabilities recurring fair value measurements $ 32,470 $ — $ 32,470 $ — Nonrecurring fair value measurements Individually-evaluated nonperforming loans $ 1,909 $ — $ — $ 1,909 Other real estate owned and repossessed assets 393 — — 393 Total nonrecurring fair value measurements $ 2,302 $ — $ — $ 2,302 December 31, 2020 Fair Value Measurements Using: December 31, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) 2020 (level 1) (level 2) (level 3) Recurring fair value measurements Equity securities $ 13,047 $ 13,047 $ — $ — Available-for-sale debt securities U.S. Treasury 39,982 — 39,982 — U.S. Government sponsored entities and agencies 211,682 — 211,682 — Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 1,264,737 — 1,264,737 — Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 320,098 — 320,098 — Obligations of states and political subdivisions 115,762 — 114,227 1,535 Corporate debt securities 25,875 — 25,875 — Total available-for-sale debt securities $ 1,978,136 $ — $ 1,976,601 $ 1,535 Loans held for sale 168,378 — 168,378 — Other assets - interest rate derivatives agreements 46,418 — 46,418 — Total assets recurring fair value measurements $ 2,205,979 $ 13,047 $ 2,191,397 $ 1,535 Other liabilities - interest rate derivatives agreements $ 49,917 $ — $ 49,917 $ — Total liabilities recurring fair value measurements $ 49,917 $ — $ 49,917 $ — Nonrecurring fair value measurements Individually-evaluated nonperforming loans $ 1,958 $ — $ — $ 1,958 Other real estate owned and repossessed assets 549 — — 549 Total nonrecurring fair value measurements $ 2,507 $ — $ — $ 2,507 Wesbanco’s policy is to recognize transfers between levels as of the actual date of the event or change in circumstances that caused the transfer. There were no significant transfers between level 1, 2 or 3 for the three months ended March 31, 2021 or for the year ended December 31, 2020. The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which Wesbanco has utilized level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements Fair Value Valuation Unobservable Range (Weighted (unaudited, in thousands) Estimate Techniques Input Average) March 31, 2021 Individually-evaluated nonperforming loans $ 1,909 Appraisal of collateral (1) Appraisal adjustments (2) (30.0%)/(30.0%) Liquidation expenses (2) (5.6%)/(5.6%) Other real estate owned and repossessed assets $ 393 Appraisal of collateral (1), (3) December 31, 2020 Individually-evaluated nonperforming loans $ 1,958 Appraisal of collateral (1) Appraisal adjustments (2) (30.0%)/(30.0%) Liquidation expenses (2) (5.6%)/(5.6%) Other real estate owned and repossessed assets $ 549 Appraisal of collateral (1), (3) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs, which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of appraisal adjustments and liquidation expense are presented as a percent of the appraisal. (3) Includes estimated liquidation expenses and numerous dissimilar qualitative adjustments by management, which are not identifiable. The estimated fair values of Wesbanco’s financial instruments are summarized below: Fair Value Measurements at March 31, 2021 Carrying Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (unaudited, in thousands) Amount Estimate (level 1) (level 2) (level 3) Financial Assets Cash and due from banks $ 759,048 $ 759,048 $ 759,048 $ — $ — Equity securities 13,123 13,123 13,123 — — Available-for-sale debt securities 2,775,212 2,775,212 — 2,773,701 1,511 Held-to-maturity debt securities 813,450 839,872 — 839,411 461 Net loans 10,543,272 10,540,445 — — 10,540,445 Loans held for sale 153,520 153,520 — 153,520 — Other assets - interest rate derivatives 31,732 31,732 — 31,732 — Accrued interest receivable 68,896 68,896 68,896 — — Financial Liabilities Deposits 13,286,999 13,300,728 11,731,925 1,568,803 — Federal Home Loan Bank borrowings 433,984 438,211 — 438,211 — Other borrowings 137,218 125,925 125,925 — — Subordinated debt and junior subordinated debt 192,430 172,142 — 105,371 66,771 Other liabilities - interest rate derivatives 32,470 32,470 — 32,470 — Accrued interest payable 3,224 3,224 3,224 — — Fair Value Measurements at December 31, 2020 Carrying Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Amount Estimate (level 1) (level 2) (level 3) Financial Assets Cash and due from banks $ 905,447 $ 905,447 $ 905,447 $ — $ — Equity securities 13,047 13,047 13,047 — — Available-for-sale debt securities 1,978,136 1,978,136 — 1,976,601 1,535 Held-to-maturity debt securities 730,886 768,183 — 767,720 463 Net loans 10,603,406 10,802,883 — — 10,802,883 Loans held for sale 168,378 168,378 — 168,378 — Other assets - interest rate derivatives 46,418 46,418 — 46,418 — Accrued interest receivable 66,790 66,790 66,790 — — Financial Liabilities Deposits 12,429,373 12,439,981 10,810,863 1,629,118 — Federal Home Loan Bank borrowings 549,003 555,375 — 555,375 — Other borrowings 241,950 235,796 235,796 — — Subordinated debt and junior subordinated debt 192,291 174,452 — 105,768 68,684 Other liabilities - interest rate derivatives 49,917 49,917 — 49,917 — Accrued interest payable 4,314 4,314 4,314 — — The following methods and assumptions were used to measure the fair value of financial instruments recorded at cost on Wesbanco’s consolidated balance sheets: Cash and due from banks: The carrying amount for cash and due from banks is a reasonable estimate of fair value. Held-to-maturity debt securities: Fair values for debt securities held-to-maturity are determined in the same manner as investment securities, which are described above. Net loans: Fair values for loans are estimated using a discounted cash flow methodology. The discount rates take into account interest rates currently being offered to customers for loans with similar terms, the credit risk associated with the loan and other market factors, including liquidity. Wesbanco believes the discount rates are consistent with transactions occurring in the marketplace for both performing and distressed loan types. The carrying value is net of the allowance for loan losses and other associated premiums and discounts. Due to the significant judgment involved in evaluating credit quality, loans are classified within level 3 of the fair value hierarchy. Accrued interest receivable: The carrying amount of accrued interest receivable approximates its fair value . Deposits: The carrying amount is considered a reasonable estimate of fair value for demand, savings and other variable rate deposit accounts. The fair value of fixed maturity certificates of deposit is estimated by a discounted cash flow method using rates currently offered for deposits of similar remaining maturities. Federal Home Loan Bank borrowings: The fair value of FHLB borrowings is based on rates currently available to Wesbanco for borrowings with similar terms and remaining maturities. Other borrowings: The carrying amount of federal funds purchased and overnight sweep accounts generally approximate fair value. Other repurchase agreements are based on quoted market prices if available. If market prices are not available, for certain fixed and adjustable rate repurchase agreements, then quoted market prices of similar instruments are used. Subordinated debt and junior subordinated debt: The fair value of subordinated debt is estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements. Due to the pooled nature of junior subordinated debt owed to unconsolidated subsidiary trusts, which are not actively traded, estimated fair value is based on recent similar transactions of single-issuer trust preferred securities. Accrued interest payable: The carrying amount of accrued interest payable approximates its fair value. Off-balance sheet financial instruments: Off-balance sheet financial instruments consist of commitments to extend credit, including letters of credit. Fair values for commitments to extend credit are estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present credit standing of the counterparties. The estimated fair value of the commitments to extend credit and letters of credit are insignificant and therefore are not presented in the above tables.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2021
Revenue Recognition [Abstract]
Revenue Recognition	NOTE 8. REVENUE RECOGNITION Interest income, net securities gains (losses) and bank-owned life insurance are not in scope of ASC 606, Revenue from Contracts with Customers Trust fees: Fees are earned over a period of time between monthly and annually, per the related fee schedule. The fees are earned ratably over the period for investment, safekeeping and other services performed by Wesbanco. The fees are accrued when earned based on the daily asset value on the last day of the quarter. In most cases, the fees are directly debited from the customer account. WesMark fees consist of investment advisory fees and shareholder service fees and are paid to Wesbanco by the WesMark mutual funds on a monthly basis for Wesbanco’s involvement with the management of the funds. Service charges on deposits: There are monthly service charges for both commercial and personal banking customers, which are earned over the month per the related fee schedule based on the customers’ deposits. There are also transaction-based fees, which are earned based on specific transactions or customer activity within the customers’ deposit accounts. These are earned at the time the transaction or customer activity occurs. The fees are debited from the customer account. Net securities brokerage revenue: Commission income is earned based on customer transactions and management of investments. The commission income from customers’ transactions is recognized when the transaction is complete and approved. Annuity commissions are earned based upon the carrier’s commission rate for the annuity product chosen by the investing customer. The commission income from the management of investments over time is earned continuously over a quarterly period. Debit card sponsorship income: Debit card sponsorship income is earned from Wesbanco’s sponsorship of its customers, which include independent service organizations, processors and other banks into different debit networks. For providing this service, the customers pay the bank a per transaction fee for each transaction processed through the network. In some cases, customers are also charged annual sponsorship fees and non-compliance fees as applicable. The fees are earned at the time the transaction or customer activity occurs. The fees are either directly debited from the customers' deposit accounts or are billed to the customer. Payment processing fees: Payment processing fees are earned from the bill payment and electronic funds transfer (“EFT”) services provided under the name FirstNet. The fees are derived from both the individual consumer banking transactions and from businesses or service providers through monthly billing for total transactions occurring. These fees are earned at the time the transaction or customer activity occurs. The fees are debited from the customers’ deposit accounts or charged directly to the business or service provider. Electronic banking fees: Interchange and ATM fees are earned based on customer and ATM transactions. Revenue is recognized when the transaction is settled. Mortgage banking income: Income is earned when Wesbanco -originated loans are sold to an investor on the secondary market. The investor bids on the loans. If the price is accepted, Wesbanco delivers the loan documents to the investor. Once received and approved by the investor, revenue is recognized and the loans are derecognized from the Consolidated Balance Sheet. Prior to the loans being sold, they are classified as l oans h eld for s ale. Additionally, the change s in the fair value of the loans held for sale, loan commitments and related derivatives are included in mortgage banking income and are slightly offset by any deferred direct origination costs, such as mortgage loan officer commissions . Net gain or loss on sale of other real estate owned: Net gain or loss is recorded when other real estate is sold to a third party and the Bank collects substantially all of the consideration to which Wesbanco is entitled in exchange for the transfer of the property. The following table summarizes the point of revenue recognition and the income recognized for each of the revenue streams for the three months ended March 31, 2021 and 2020, respectively: Point of Revenue For the Three Months Ended March 31, (unaudited, in thousands) Recognition 2021 2020 Revenue Streams Trust fees Trust account fees Over time $ 5,313 $ 4,857 WesMark fees Over time 2,318 2,095 Total trust fees 7,631 6,952 Service charges on deposits Commercial banking fees Over time 564 585 Personal service charges At a point in time and over time 4,330 6,032 Total service charges on deposits 4,894 6,617 Net securities brokerage revenue Annuity commissions At a point in time 917 1,038 Equity and debt security trades At a point in time 76 159 Managed money Over time 283 235 Trail commissions Over time 248 247 Total net securities brokerage revenue 1,524 1,679 Debit card sponsorship income (1) At a point in time and over time 646 708 Payment processing fees (1) At a point in time and over time 713 680 Electronic banking fees At a point in time 4,365 4,254 Mortgage banking income At a point in time 4,264 1,276 Net gain on other real estate owned and other assets At a point in time 175 169 (1)

Comprehensive Income_(Loss)

Comprehensive Income/(Loss)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Comprehensive Income/(Loss)	NOTE 9. COMPREHENSIVE INCOME/(LOSS) The activity in accumulated other comprehensive income for the three months ended March 31, 2021 and 2020 is as follows: Accumulated Other Comprehensive Income/(Loss) (1) (unaudited, in thousands) Defined Benefit Plans Unrealized Gains (Losses) on Debt Securities Available-for-Sale Unrealized Gains on Debt Securities Transferred from Available-for-Sale to Held-to-Maturity Total Balance at December 31, 2020 $ (15,502 ) $ 46,861 $ — $ 31,359 Other comprehensive income/(loss) before reclassifications — (22,026 ) — (22,026 ) Amounts reclassified from accumulated other comprehensive income/(loss) 472 (2 ) — 470 Period change 472 (22,028 ) — (21,556 ) Balance at March 31, 2021 $ (15,030 ) $ 24,833 $ — $ 9,803 Balance at December 31, 2019 $ (17,468 ) $ 18,644 $ 25 $ 1,201 Other comprehensive income/(loss) before reclassifications — 41,116 — 41,116 Amounts reclassified from accumulated other comprehensive income/(loss) 569 (1,743 ) (2 ) (1,176 ) Period change 569 39,373 (2 ) 39,940 Balance at March 31, 2020 $ (16,899 ) $ 58,017 $ 23 $ 41,141 (1 ) All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 24% in both periods presented. The following table provides details about amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020: Details about Accumulated Other Comprehensive Income/(Loss) Components For the Three Months Ended March 31, Affected Line Item in the Statement of Comprehensive Income (unaudited, in thousands) 2021 2020 Debt securities available-for-sale (1) Net securities gains reclassified into earnings $ (3 ) $ (2,287 ) Net securities gains (Non-interest income) Related income tax expense ⁽²⁾ 1 544 Provision for income taxes Net effect on accumulated other comprehensive income for the period (2 ) (1,743 ) Debt securities held-to-maturity (1) Amortization of unrealized gain transferred from available-for-sale — (3 ) Interest and dividends on securities (Interest and dividend income) Related income tax expense ⁽²⁾ — 1 Provision for income taxes Net effect on accumulated other comprehensive income for the period — (2 ) Defined benefit plans (3) Amortization of net loss and prior service costs 622 746 Employee benefits (Non-interest expense) Related income tax benefit ⁽²⁾ (150 ) (177 ) Provision for income taxes Net effect on accumulated other comprehensive income for the period 472 569 Total reclassifications for the period $ 470 $ (1,176 ) (1) (2) Income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 24% in both periods presented. (3) Included in the computation of net periodic pension cost. See Note 6, “Benefit Plans” for additional detail.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	NOTE 10. COMMITMENTS AND CONTINGENT LIABILITIES Commitments — In the normal course of business, Wesbanco offers off-balance sheet credit arrangements to enable its customers to meet their financing objectives. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Wesbanco’s exposure to credit losses in the event of non-performance by the other parties to the financial instruments for commitments to extend credit and standby letters of credit is limited to the contractual amount of those instruments. Wesbanco uses the same credit policies in making commitments and conditional obligations as for all other lending. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The allowance for credit losses associated with commitments was $6.7 million and $9.5 million at March 31, 2021 and December 31, 2020, respectively, and is included in other liabilities on the Consolidated Balance Sheets. Letters of credit are conditional commitments issued by banks to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements, including normal business activities, bond financing and similar transactions. Letters of credit are considered guarantees. The liability associated with letters of credit was $0.1 million and $0.2 million as of March 31, 2021 and December 31, 2020, respectively. Contingent obligations to purchase loans funded by other entities include affordable housing plan guarantees, credit card guarantees, loans sold with recourse as well as obligations to the FHLB. Affordable housing plan guarantees are performance guarantees for various building project loans. The guarantee amortizes as the loan balances decrease. Credit card guarantees are credit card balances not owned by Wesbanco, whereby the Bank guarantees the performance of the cardholder. The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding: March 31, December 31, (unaudited, in thousands) 2021 2020 Lines of credit $ 2,497,734 $ 2,510,011 Loans approved but not closed 470,736 381,180 Overdraft limits 153,374 154,322 Letters of credit 53,136 53,788 Contingent obligations and other guarantees 199,066 126,984 Contingent Liabilities — Wesbanco is a party to various legal and administrative proceedings and claims. While any litigation contains an element of uncertainty, management does not believe that a material loss related to such proceedings or claims pending or known to be threatened is reasonably possible.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Business Segments	NOTE 11. BUSINESS SEGMENTS Wesbanco operates two reportable segments: community banking and trust and investment services. Wesbanco’s community banking segment offers services traditionally offered by full-service commercial banks, including commercial demand, individual demand and time deposit accounts, as well as commercial, mortgage and individual installment loans, and certain non-traditional offerings, such as insurance and securities brokerage services. The trust and investment services segment offers trust services as well as various alternative investment products including mutual funds. The market value of assets managed or held in custody by the trust and investment services segment was approximately $5.2 billion and $4.1 billion at March 31, 2021 and 2020, respectively. These assets are held by Wesbanco in fiduciary or agency capacities for their customers and therefore are not included as assets on Wesbanco’s Consolidated Balance Sheets. Condensed financial information by business segment is presented below: Trust and Community Investment (unaudited, in thousands) Banking Services Consolidated For The Three Months Ended March 31, 2021 Interest and dividend income $ 125,054 $ — $ 125,054 Interest expense 8,576 — 8,576 Net interest income 116,478 — 116,478 Provision for credit losses (27,958 ) — (27,958 ) Net interest income after provision for credit losses 144,436 — 144,436 Non-interest income 25,577 7,631 33,208 Non-interest expense 82,011 4,316 86,327 Income before provision for income taxes 88,002 3,315 91,317 Provision for income taxes 17,506 696 18,202 Net income 70,496 2,619 73,115 Preferred stock dividends 2,531 — 2,531 Net income available to common shareholders $ 67,965 $ 2,619 $ 70,584 For The Three Months Ended March 31, 2020 Interest and dividend income $ 142,448 $ — $ 142,448 Interest expense 22,286 — 22,286 Net interest income 120,162 — 120,162 Provision for credit losses 29,821 — 29,821 Net interest income after provision for credit losses 90,341 — 90,341 Non-interest income 21,057 6,952 28,009 Non-interest expense 86,918 4,415 91,333 Income before provision for income taxes 24,480 2,537 27,017 Provision for income taxes 3,088 533 3,621 Net income available to common shareholders $ 21,392 $ 2,004 $ 23,396 Total non-fiduciary assets of the trust and investment services segment were $3.9 million (including $1.7 million of trust customer intangibles) and $3.8 million (including $2.2 million of trust customer intangibles) at March 31, 2021 and 2020, respectively. All other assets, including goodwill and the remainder of other intangible assets, were allocated to the Community Banking segment.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation — The accompanying unaudited interim financial statements of Wesbanco, Inc. and its consolidated subsidiaries (“Wesbanco”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2020. Wesbanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2020 Annual Report on Form 10-K filed with the Securities and Exchange Commission. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly Wesbanco’s financial position and results of operations for each of the interim periods presented. Certain prior period amounts have been reclassified to conform to the current period presentation. Such reclassifications had no impact on Wesbanco’s net income and stockholders’ equity. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year.
Recent accounting pronouncements	Recent accounting pronouncements— The Financial Accounting Standards Board (“FASB”) issued Accounting Standards Updates (“ASU”) as noted below. ASU 2020-04 Reference Rate Reform (Topic 848) In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848)”. Due to the potential discontinuance of the London Interbank Offered Rate (LIBOR), regulators have undertaken reference rate initiatives to identify alternative reference rates that are more observable or transaction based and less susceptible to manipulation. The ASU also provides optional expedients for contract modifications that replace a reference rate affected by reference rate reform. The guidance is effective as of March 12, 2020 through December 31, 2022. Wesbanco is assessing the impact of adopting the new guidance on the consolidated financial statements on an ongoing basis with no material impacts expected at this time.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Summary of Earnings Per Common Share	Earnings per common share are calculated as follows: For the Three Months Ended March 31, (unaudited, in thousands, except shares and per share amounts) 2021 2020 Numerator for both basic and diluted earnings per common share: Net income available to common shareholders $ 70,584 $ 23,396 Denominator: Total average basic common shares outstanding 67,263,714 67,486,550 Effect of dilutive stock options and other stock compensation 91,704 100,896 Total diluted average common shares outstanding 67,355,418 67,587,446 Earnings per common share - basic $ 1.05 $ 0.35 Earnings per common share - diluted $ 1.05 $ 0.35

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities	The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity debt securities: March 31, 2021 December 31, 2020 (unaudited, in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale debt securities U.S. Treasury $ 29,986 $ 11 $ — $ 29,997 $ 39,975 $ 7 $ — $ 39,982 U.S. Government sponsored entities and agencies 174,472 4,564 (2,706 ) 176,330 204,109 7,715 (142 ) 211,682 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 2,123,853 30,901 (13,961 ) 2,140,793 1,230,106 35,979 (1,348 ) 1,264,737 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 284,440 7,962 (721 ) 291,681 308,903 11,464 (269 ) 320,098 Obligations of states and political subdivisions 105,778 6,056 (36 ) 111,798 108,602 7,160 — 115,762 Corporate debt securities 23,953 660 — 24,613 24,963 912 — 25,875 Total available-for-sale debt securities $ 2,742,482 $ 50,154 $ (17,424 ) $ 2,775,212 $ 1,916,658 $ 63,237 $ (1,759 ) $ 1,978,136 Held-to-maturity debt securities U.S. Government sponsored entities and agencies $ 7,611 $ 106 $ — $ 7,717 $ 7,779 $ 265 $ — $ 8,044 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 80,376 2,738 (5 ) 83,109 89,151 3,251 — 92,402 Obligations of states and political subdivisions 692,616 24,501 (3,811 ) 713,306 601,128 30,173 (59 ) 631,242 Corporate debt securities 33,137 2,603 — 35,740 33,154 3,341 — 36,495 Total held-to-maturity debt securities $ 813,740 $ 29,948 $ (3,816 ) $ 839,872 $ 731,212 $ 37,030 $ (59 ) $ 768,183 Total debt securities $ 3,556,222 $ 80,102 $ (21,240 ) $ 3,615,084 $ 2,647,870 $ 100,267 $ (1,818 ) $ 2,746,319 (1) Total held-to-maturity debt securities are presented on the balance sheet net of their allowance for credit losses totaling $0.3 million at March 31, 2021 and December 31, 2020.
Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity	The following table presents the amortized cost and fair value of available-for-sale and held-to-maturity debt securities by contractual maturity date at March 31, 2021. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay debt obligations with or without prepayment penalties. Mortgage-backed securities and collateralized mortgage obligations are classified in the table below based on their contractual maturity date; however, regular principal payments and prepayments of principal are received on a monthly basis. (unaudited, in thousands) Amortized Cost Fair Value Available-for-sale debt securities Less than one year $ 47,465 $ 47,583 1-5 years 145,739 152,800 5-10 years 358,854 366,119 Over 10 years 2,190,424 2,208,710 Total available-for-sale debt securities $ 2,742,482 $ 2,775,212 Held-to-maturity debt securities Less than one year $ 11,759 $ 11,872 1-5 years 133,053 140,315 5-10 years 228,148 237,907 Over 10 years 440,780 449,778 Total held-to-maturity debt securities $ 813,740 $ 839,872 Total debt securities $ 3,556,222 $ 3,615,084
Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities	The following table presents the gross realized gains and losses on sales and calls of available-for-sale and held-to-maturity debt securities, as well as gains and losses on equity securities from both sales and market adjustments, for the three months ended March 31, 2021 and 2020, respectively. All gains and losses presented in the table below are included in the net securities gains (losses) line item of the income statement. For those equity securities relating to the key officer and director deferred compensation plan, the corresponding change in the obligation to the participant is recognized in employee benefits expense. For the Three Months Ended March 31, (unaudited, in thousands) 2021 2020 Debt securities: Gross realized gains $ 140 $ 3,335 Gross realized losses (39 ) (1,031 ) Net gains on debt securities $ 101 $ 2,304 Equity securities: Net unrealized gains (losses) recognized on securities still held $ 178 $ (805 ) Net realized losses recognized on securities sold — (8 ) Net gains (losses) on equity securities $ 178 $ (813 ) Net securities gains $ 279 $ 1,491
Schedule of Allowance for Credit Losses on Held-to-maturity Securities	The following table provides a roll-forward of the allowance for credit losses on held-to-maturity securities for the three months ended March 31, 2021 and March 31, 2020, respectively: Allowance for Credit Losses By Category For the Three Months Ended March 31, 2021 and 2020 Residential mortgage -backed securities and collateralized mortgage obligations Obligations of U.S. Government of government state and Corporate sponsored sponsored entities political debt (unaudited, in thousands) entities and agencies and agencies subdivisions Securities Total Balance at December 31, 2020 $ — $ — $ 130 $ 196 $ 326 Current period provision — — (12 ) (24 ) (36 ) Write-offs — — — — — Recoveries — — — — — Balance at March 31, 2021 $ — $ — $ 118 $ 172 $ 290 . Balance at December 31, 2019 $ — $ — $ — $ — $ — Impact of adopting ASC 326 — — 96 133 229 Current period provision — — 2 5 7 Write-offs — — — — — Recoveries — — — — — Balance at March 31, 2020 $ — $ — $ 98 $ 138 $ 236
Schedule of Unrealized Losses on Investment Securities	The following tables provide information on unrealized losses on available-for-sale debt securities that have been in an unrealized loss position for less than twelve months and twelve months or more, for which an allowance for credit losses has not been recorded, as of March 31, 2021 and December 31, 2020, respectively: March 31, 2021 Less than 12 months 12 months or more Total (unaudited, dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Government sponsored entities and agencies $ 56,270 $ (2,706 ) 6 $ — $ — — $ 56,270 $ (2,706 ) 6 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 973,961 (13,879 ) 98 3,531 (82 ) 4 977,492 (13,961 ) 102 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 94,186 (721 ) 9 — — — 94,186 (721 ) 9 Obligations of state and political subdivisions 3,767 (36 ) 1 — — — 3,767 (36 ) 1 Total $ 1,128,184 $ (17,342 ) 114 $ 3,531 $ (82 ) 4 $ 1,131,715 $ (17,424 ) $ 118 December 31, 2020 Less than 12 months 12 months or more Total (dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Government sponsored entities and agencies $ 18,308 $ (142 ) 2 $ — $ — — $ 18,308 $ (142 ) 2 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 224,448 (1,227 ) 41 4,136 (121 ) 3 228,584 (1,348 ) 44 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 97,266 (269 ) 10 — — — 97,266 (269 ) 10 Obligations of states and political subdivisions — — — — — — — — — Total $ 340,022 $ (1,638 ) 53 $ 4,136 $ (121 ) 3 $ 344,158 $ (1,759 ) 56

Loans and the Allowance for C_2

Loans and the Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Schedule of Recorded Investment in Loans by Category	The recorded investment in loans is presented in the Consolidated Balance Sheets net of deferred loan fees and costs, and discounts on purchased loans. Net deferred loan income was $13.3 million and $6.2 million at March 31, 2021 and December 31, 2020, respectively. At March 31, 2021 and December 31, 2020, respectively, the balance included $21.4 and $13.8 million of net deferred income from PPP loans. The un-accreted discount on purchased loans from acquisitions was $35.9 million at March 31, 2021 and $39.4 million at December 31, 2020. March 31, December 31, (unaudited, in thousands) 2021 2020 Commercial real estate: Land and construction $ 642,017 $ 668,277 Improved property 5,070,725 5,037,115 Total commercial real estate 5,712,742 5,705,392 Commercial and industrial 1,598,921 1,681,182 Commercial and industrial - PPP 823,814 726,256 Residential real estate 1,644,422 1,720,961 Home equity 634,018 646,387 Consumer 289,395 309,055 Total portfolio loans 10,703,312 10,789,233 Loans held for sale 153,520 168,378 Total loans $ 10,856,832 $ 10,957,611
Summary of Changes in Allowance for Credit Losses	The following tables summarize changes in the allowance for credit losses applicable to each category of the loan portfolio: Allowance for Credit Losses By Category For the Three Months Ended March 31, 2021 and 2020 (unaudited, in thousands) Commercial Real Estate - Land and Construction Commercial Real Estate- Improved Property Commercial & Industrial Residential Real Estate Home Equity Consumer Deposit Overdrafts Total Balance at December 31, 2020 Allowance for credit losses - loans $ 10,841 $ 110,652 $ 37,850 $ 17,851 $ 1,487 $ 6,507 $ 639 $ 185,827 Allowance for credit losses - loan commitments 6,508 712 1,275 955 45 19 — 9,514 Total beginning allowance for credit losses - loans and loan commitments 17,349 111,364 39,125 18,806 1,532 6,526 639 195,341 Provision for credit losses: Provision for loan losses (3,538 ) (11,420 ) (4,256 ) (4,177 ) (394 ) (1,510 ) 156 (25,139 ) Provision for loan commitments (2,508 ) (504 ) 308 (86 ) 5 2 — (2,783 ) Total provision for credit losses - loans and loan commitments (6,046 ) (11,924 ) (3,948 ) (4,263 ) (389 ) (1,508 ) 156 (27,922 ) Charge-offs (18 ) (19 ) (750 ) (371 ) (174 ) (927 ) (201 ) (2,460 ) Recoveries 55 528 440 135 79 462 113 1,812 Net charge-offs 37 509 (310 ) (236 ) (95 ) (465 ) (88 ) (648 ) Balance at March 31, 2021 Allowance for credit losses - loans 7,340 99,741 33,284 13,438 998 4,532 707 160,040 Allowance for credit losses - loan commitments 4,000 208 1,583 869 50 21 — 6,731 Total ending allowance for credit losses - loans and loan commitments $ 11,340 $ 99,949 $ 34,867 $ 14,307 $ 1,048 $ 4,553 $ 707 $ 166,771 Balance at December 31, 2019 Allowance for credit losses - loans $ 4,949 $ 20,293 $ 14,116 $ 4,311 $ 4,422 $ 2,951 $ 1,387 $ 52,429 Allowance for credit losses - loan commitments 235 22 311 15 250 41 — 874 Total beginning allowance for credit losses - loans and loan commitments 5,184 20,315 14,427 4,326 4,672 2,992 1,387 53,303 Impact of adopting ASC 326 1,524 13,078 22,357 5,630 (3,936 ) 2,576 213 41,442 Provision for credit losses: Provision for loan losses 2,564 20,585 5,632 237 646 (1,241 ) (351 ) 28,072 Provision for loan commitments 2,274 — (582 ) 49 2 — — 1,743 Total provision for credit losses - loans and loan commitments 4,838 20,585 5,050 286 648 (1,241 ) (351 ) 29,815 Charge-offs (1 ) (1,398 ) (2,714 ) (386 ) (443 ) (856 ) (328 ) (6,126 ) Recoveries 8 293 107 272 172 415 143 1,410 Net charge-offs 7 (1,105 ) (2,607 ) (114 ) (271 ) (441 ) (185 ) (4,716 ) Balance at March 31, 2020 Allowance for credit losses - loans 6,442 52,873 39,227 9,684 1,096 3,886 1,064 114,272 Allowance for credit losses - loan commitments 5,111 — — 444 17 — — 5,572 Total ending allowance for credit losses - loans and loan commitments $ 11,553 $ 52,873 $ 39,227 $ 10,128 $ 1,113 $ 3,886 $ 1,064 $ 119,844
Allowance for Credit Losses and Recorded Investments in Loans	The following tables present the allowance for credit losses and recorded investments in loans by category, as of each period-end: Allowance for Credit Losses and Recorded Investment in Loans (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial and Industrial Residential Real Estate Home Equity Consumer Deposit Over- drafts Total March 31, 2021 Allowance for credit losses: Loans individually-evaluated $ 503 $ 4,035 $ 1,501 $ — $ — $ — $ — $ 6,039 Loans collectively-evaluated 6,837 95,706 31,783 13,438 998 4,532 707 154,001 Loan commitments 4,000 208 1,583 869 50 21 — 6,731 Total allowance for credit losses - loans and commitments $ 11,340 $ 99,949 $ 34,867 $ 14,307 $ 1,048 $ 4,553 $ 707 $ 166,771 Portfolio loans: Individually-evaluated for credit losses (1) $ 1,125 $ 40,158 $ 1,838 $ — $ — $ — $ — $ 43,121 Collectively-evaluated for credit losses 640,892 5,030,567 2,420,897 1,644,422 634,018 289,395 — 10,660,191 Total portfolio loans $ 642,017 $ 5,070,725 $ 2,422,735 $ 1,644,422 $ 634,018 $ 289,395 $ — $ 10,703,312 December 31, 2020 Allowance for credit losses: Loans individually-evaluated $ 602 $ 4,196 $ 1,484 $ — $ — $ — $ — $ 6,282 Loans collectively-evaluated 10,239 106,456 36,366 17,851 1,487 6,507 639 179,545 Loan commitments 6,508 712 1,275 955 45 19 — 9,514 Total allowance for credit losses - loans and commitments $ 17,349 $ 111,364 $ 39,125 $ 18,806 $ 1,532 $ 6,526 $ 639 $ 195,341 Portfolio loans: Individually-evaluated for credit losses (1) $ 1,455 $ 40,372 $ 2,863 $ — $ — $ — $ — $ 44,690 Collectively-evaluated for credit losses 666,822 4,996,743 2,404,575 1,720,961 646,387 309,055 — 10,744,543 Total portfolio loans $ 668,277 $ 5,037,115 $ 2,407,438 $ 1,720,961 $ 646,387 $ 309,055 $ — $ 10,789,233 (1 )
Summary of Commercial Loans by Risk Grade	The following tables summarize commercial loans by their assigned risk grade: Commercial Loans by Internally Assigned Risk Grade (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial & Industrial Total Commercial Loans As of March 31, 2021 Pass $ 634,835 $ 4,679,257 $ 2,365,558 $ 7,679,650 Criticized - compromised 5,360 297,801 37,782 340,943 Classified - substandard 1,822 93,667 19,395 114,884 Classified - doubtful — — — — Total $ 642,017 $ 5,070,725 $ 2,422,735 $ 8,135,477 As of December 31, 2020 Pass $ 657,435 $ 4,609,726 $ 2,350,724 $ 7,617,885 Criticized - compromised 7,397 320,301 34,597 362,295 Classified - substandard 3,445 107,088 22,117 132,650 Classified - doubtful — — — — Total $ 668,277 $ 5,037,115 $ 2,407,438 $ 8,112,830
Summary of Age Analysis of Loan Categories	The following tables summarize the age analysis of all categories of loans: Age Analysis of Loans (unaudited, in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Total Past Due Total Loans 90 Days or More Past Accruing (1) As of March 31, 2021 Commercial real estate: Land and construction $ 639,378 $ 1,120 $ 759 $ 760 $ 2,639 $ 642,017 $ 641 Improved property 5,055,419 4,041 1,984 9,281 15,306 5,070,725 1,955 Total commercial real estate 5,694,797 5,161 2,743 10,041 17,945 5,712,742 2,596 Commercial and industrial 2,408,663 4,823 2,657 6,592 14,072 2,422,735 5,314 Residential real estate 1,625,328 2,713 1,589 14,792 19,094 1,644,422 4,007 Home equity 628,773 1,213 197 3,835 5,245 634,018 784 Consumer 287,395 1,428 340 232 2,000 289,395 123 Total portfolio loans 10,644,956 15,338 7,526 35,492 58,356 10,703,312 12,824 Loans held for sale 153,520 — — — — 153,520 — Total loans $ 10,798,476 $ 15,338 $ 7,526 $ 35,492 $ 58,356 $ 10,856,832 $ 12,824 Nonperforming loans included above are as follows: Non-accrual loans $ 9,960 $ 940 $ 1,100 $ 22,575 $ 24,615 $ 34,575 TDRs accruing interest (1) 3,248 63 159 93 315 3,563 Total nonperforming loans $ 13,208 $ 1,003 $ 1,259 $ 22,668 $ 24,930 $ 38,138 As of December 31, 2020 Commercial real estate: Land and construction $ 664,990 $ 582 $ 2,276 $ 429 $ 3,287 $ 668,277 $ 288 Improved property 5,016,812 4,876 4,118 11,309 20,303 5,037,115 2,713 Total commercial real estate 5,681,802 5,458 6,394 11,738 23,590 5,705,392 3,001 Commercial and industrial 2,395,844 4,372 2,197 5,025 11,594 2,407,438 1,899 Residential real estate 1,698,636 2,614 5,654 14,057 22,325 1,720,961 2,863 Home equity 639,319 2,414 775 3,879 7,068 646,387 706 Consumer 305,483 1,998 1,031 543 3,572 309,055 377 Total portfolio loans 10,721,084 16,856 16,051 35,242 68,149 10,789,233 8,846 Loans held for sale 168,378 — — — — 168,378 — Total loans $ 10,889,462 $ 16,856 $ 16,051 $ 35,242 $ 68,149 $ 10,957,611 $ 8,846 Nonperforming loans included above are as follows: Non-accrual loans $ 9,560 $ 630 $ 466 $ 26,224 $ 27,320 $ 36,880 TDRs accruing interest (1) 3,540 63 152 172 387 3,927 Total nonperforming loans $ 13,100 $ 693 $ 618 $ 26,396 $ 27,707 $ 40,807 (1) Loans 90 days or more past due and accruing interest exclude TDRs 90 days or more past due and accruing interest.
Summary of Nonperforming Loans	The following tables summarize nonperforming loans: Nonperforming Loans March 31, 2021 December 31, 2020 Unpaid Unpaid Principal Recorded Related Principal Recorded Related (unaudited, in thousands) Balance (1) Investment Allowance Balance (1) Investment Allowance With no related specific allowance recorded: Commercial real estate: Land and construction $ 138 $ 120 $ — $ 469 $ 469 $ — Improved property 8,719 7,349 — 9,597 8,055 — Commercial and industrial 1,860 1,675 — 4,401 3,413 — Residential real estate 23,605 20,990 — 23,055 20,704 — Home equity 6,518 5,569 — 6,635 5,708 — Consumer 593 351 — 602 364 — Total nonperforming loans without a specific allowance 41,433 36,054 — 44,759 38,713 — With a specific allowance recorded: Commercial real estate: Land and construction — — — — — — Improved property 2,094 2,084 175 2,094 2,094 136 Commercial and industrial — — — — — — Residential real estate — — — — — — Home equity — — — — — — Consumer — — — — — — Total nonperforming loans with a specific allowance 2,094 2,084 175 2,094 2,094 136 Total nonperforming loans $ 43,527 $ 38,138 $ 175 $ 46,853 $ 40,807 $ 136 (1) Nonperforming Loans For the Three Months Ended March 31, 2021 March 31, 2020 Average Interest Average Interest Recorded Income Recorded Income (unaudited, in thousands) Investment Recognized Investment Recognized With no related specific allowance recorded: Commercial real estate: Land and construction $ 295 $ — $ 393 $ — Improved property 7,702 9 5,501 20 Commercial and industrial 2,544 1 8,570 3 Residential real estate 20,847 39 18,470 55 Home equity 5,639 6 5,811 6 Consumer 358 — 390 1 Total nonperforming loans without a specific allowance 37,385 55 39,135 85 With a specific allowance recorded: Commercial real estate: Land and construction — — — — Improved property 2,089 — 3,270 — Commercial and industrial — — 96 — Residential real estate — — 2,196 — Home equity — — 352 — Consumer — — 27 — Total nonperforming loans with a specific allowance 2,089 — 5,941 — Total nonperforming loans $ 39,474 $ 55 $ 45,076 $ 85
Recorded Investment in Non-Accrual Loans and TDRs	The following tables present the recorded investment in non-accrual loans and TDRs: Non-accrual Loans (1) March 31, December 31, (unaudited, in thousands) 2021 2020 Commercial real estate: Land and construction $ 120 $ 469 Improved property 9,007 9,494 Total commercial real estate 9,127 9,963 Commercial and industrial 1,571 3,302 Residential real estate 18,358 17,925 Home equity 5,181 5,345 Consumer 338 345 Total $ 34,575 $ 36,880 (1) At March 31, 2021 and December 31, 2020, there was one borrower with a loan balance greater than $1.0 million totaling $2.1 million. Total non-accrual loans include loans that are also restructured. Such loans are also set forth in the following table as non-accrual TDRs. TDRs March 31, 2021 December 31, 2020 (unaudited, in thousands) Accruing Non-Accrual Total Accruing Non-Accrual Total Commercial real estate: Land and construction $ — $ — $ — $ — $ — $ — Improved property 426 157 583 655 165 820 Total commercial real estate 426 157 583 655 165 820 Commercial and industrial 104 — 104 111 — 111 Residential real estate 2,632 1,353 3,985 2,779 1,354 4,133 Home equity 388 253 641 363 300 663 Consumer 13 5 18 19 9 28 Total $ 3,563 $ 1,768 $ 5,331 $ 3,927 $ 1,828 $ 5,755
Loans Identified as TDRs	The following tables present details related to loans identified as TDRs during the three months ended March 31, 2021 and 2020, respectively: New TDRs (1) For the Three Months Ended March 31, 2021 March 31, 2020 Pre- Post- Pre- Post- Modification Modification Modification Modification Outstanding Outstanding Outstanding Outstanding Number of Recorded Recorded Number of Recorded Recorded (unaudited, dollars in thousands) Modifications Investment Investment Modifications Investment Investment Commercial real estate: Land and construction — $ — $ — — $ — $ — Improved Property — — — — — — Total commercial real estate — — — — — — Commercial and industrial — — — — — — Residential real estate — — — 2 332 330 Home equity — — — — — — Consumer — — — — — — Total — $ — $ — 2 $ 332 $ 330 (1) Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end. The following table summarizes TDRs which defaulted (defined as past due 90 days) during the three months ended March 31, 2021 and 2020, respectively, that were restructured within the last twelve months prior to March 31, 2021 and 2020, respectively: Defaulted TDRs (1) For the Three Months Ended March 31, 2021 March 31, 2020 Number of Recorded Number of Recorded (unaudited, dollars in thousands) Defaults Investment Defaults Investment Commercial real estate: Land and construction — $ — — $ — Improved property — — — — Total commercial real estate — — — — Commercial and industrial — — 1 13 Residential real estate — — 1 155 Home equity — — — — Consumer — — — — Total — $ — 2 $ 168 (1)
Summary of Amortized Cost Basis Loan Balances by Year of Origination and Credit Quality Indicator	Loans As of March 31, 2021 Amortized Cost Basis by Origination Year (unaudited, in thousands) 2021 2020 2019 2018 2017 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: land and construction Risk rating: Pass $ 30,840 $ 164,939 $ 296,600 $ 49,749 $ 27,064 $ 43,143 $ 22,500 $ — $ 634,835 Criticized - compromised — 875 — 39 228 3,618 600 — 5,360 Classified - substandard — — — 74 40 1,708 — — 1,822 Classified - doubtful — — — — — — — — — Total $ 30,840 $ 165,814 $ 296,600 $ 49,862 $ 27,332 $ 48,469 $ 23,100 $ — $ 642,017 Commercial real estate: improved property Risk rating: Pass $ 156,789 $ 787,296 $ 690,398 $ 639,915 $ 472,801 $ 1,864,909 $ 67,149 $ — $ 4,679,257 Criticized - compromised — 1,892 53,807 17,473 53,576 150,704 20,349 — 297,801 Classified - substandard — 222 28,603 1,860 7,171 55,811 — — 93,667 Classified - doubtful — — — — — — — — — Total $ 156,789 $ 789,410 $ 772,808 $ 659,248 $ 533,548 $ 2,071,424 $ 87,498 $ — $ 5,070,725 Commercial and industrial Risk rating: Pass $ 401,323 $ 685,632 $ 232,322 $ 185,484 $ 135,856 $ 320,788 $ 404,023 $ 130 $ 2,365,558 Criticized - compromised 26 3,290 2,746 4,236 2,651 10,841 13,992 — 37,782 Classified - substandard 985 — 2,518 1,668 3,567 5,179 5,478 — 19,395 Classified - doubtful — — — — — — — — — Total $ 402,334 $ 688,922 $ 237,586 $ 191,388 $ 142,074 $ 336,808 $ 423,493 $ 130 $ 2,422,735 Residential real estate Loan delinquency: Current $ 66,997 $ 392,577 $ 209,234 $ 130,435 $ 94,237 $ 731,848 $ — $ — $ 1,625,328 30-59 days past due — — — 79 — 2,634 — — 2,713 60-89 days past due — — — 272 113 1,204 — — 1,589 90 days or more past due — — 379 784 761 12,868 — — 14,792 Total $ 66,997 $ 392,577 $ 209,613 $ 131,570 $ 95,111 $ 748,554 $ — $ — $ 1,644,422 Home equity Loan delinquency: Current $ 4,724 $ 15,055 $ 3,290 $ 2,959 $ 857 $ 16,995 $ 573,653 $ 11,240 $ 628,773 30-59 days past due — — — — — 400 783 30 1,213 60-89 days past due — — — — — 121 76 — 197 90 days or more past due — — — 19 150 1,565 1,355 746 3,835 Total $ 4,724 $ 15,055 $ 3,290 $ 2,978 $ 1,007 $ 19,081 $ 575,867 $ 12,016 $ 634,018 Consumer Loan delinquency: Current $ 18,121 $ 65,802 $ 79,045 $ 33,586 $ 18,773 $ 51,313 $ 20,589 $ 166 $ 287,395 30-59 days past due 37 444 413 68 114 352 — — 1,428 60-89 days past due — 45 50 31 64 148 2 — 340 90 days or more past due — 8 — 54 29 125 16 — 232 Total $ 18,158 $ 66,299 $ 79,508 $ 33,739 $ 18,980 $ 51,938 $ 20,607 $ 166 $ 289,395 Loans As of December 31, 2020 Amortized Cost Basis by Origination Year (unaudited, in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Total Commercial real estate: land and construction Risk rating: Pass $ 133,720 $ 314,614 $ 109,232 $ 27,483 $ 16,404 $ 29,685 $ 26,297 $ — $ 657,435 Criticized - compromised 459 — 1,532 233 79 3,778 1,316 — 7,397 Classified - substandard — — 403 58 291 2,693 — — 3,445 Classified - doubtful — — — — — — — — — Total $ 134,179 $ 314,614 $ 111,167 $ 27,774 $ 16,774 $ 36,156 $ 27,613 $ — $ 668,277 Commercial real estate: improved property Risk rating: Pass $ 809,516 $ 670,554 $ 646,629 $ 474,622 $ 572,733 $ 1,346,552 $ 89,120 $ — $ 4,609,726 Criticized - compromised 2,693 67,261 16,793 59,251 42,284 130,247 1,772 — 320,301 Classified - substandard 102 16,366 4,946 11,647 18,460 55,567 — — 107,088 Classified - doubtful — — — — — — — — — Total $ 812,311 $ 754,181 $ 668,368 $ 545,520 $ 633,477 $ 1,532,366 $ 90,892 $ — $ 5,037,115 Commercial and industrial Risk rating: Pass $ 977,085 $ 240,262 $ 193,712 $ 160,924 $ 85,379 $ 265,890 $ 427,336 $ 136 $ 2,350,724 Criticized - compromised 453 2,726 4,206 2,795 324 11,640 12,453 — 34,597 Classified - substandard — 3,817 1,947 3,771 1,603 5,073 5,906 — 22,117 Classified - doubtful — — — — — — — — — Total $ 977,538 $ 246,805 $ 199,865 $ 167,490 $ 87,306 $ 282,603 $ 445,695 $ 136 $ 2,407,438 Residential real estate Loan delinquency: Current $ 385,541 $ 242,770 $ 149,603 $ 108,090 $ 170,967 $ 641,665 $ — $ — $ 1,698,636 30-59 days past due — — 320 533 — 1,761 — — 2,614 60-89 days past due — — 823 — 185 4,646 — — 5,654 90 days or more past due — 483 166 761 819 11,828 — — 14,057 Total $ 385,541 $ 243,253 $ 150,912 $ 109,384 $ 171,971 $ 659,900 $ — $ — $ 1,720,961 Home equity Loan delinquency: Current $ 18,191 $ 3,611 $ 3,334 $ 975 $ 1,110 $ 16,477 $ 583,486 $ 12,135 $ 639,319 30-59 days past due 124 — 34 — — 882 1,247 127 2,414 60-89 days past due — — — — — 14 749 12 775 90 days or more past due — — 8 156 88 1,786 1,075 766 3,879 Total $ 18,315 $ 3,611 $ 3,376 $ 1,131 $ 1,198 $ 19,159 $ 586,557 $ 13,040 $ 646,387 Consumer Loan delinquency: Current $ 72,847 $ 89,637 $ 39,584 $ 22,118 $ 13,144 $ 45,735 $ 22,253 $ 165 $ 305,483 30-59 days past due 481 408 210 311 194 379 15 — 1,998 60-89 days past due 273 147 84 100 163 253 11 — 1,031 90 days or more past due 113 72 73 31 12 242 — — 543 Total $ 73,714 $ 90,264 $ 39,951 $ 22,560 $ 13,513 $ 46,609 $ 22,279 $ 165 $ 309,055
Summary of Other Real Estate Owned and Repossessed Assets	The following table summarizes other real estate owned and repossessed assets included in other assets: March 31, December 31, (unaudited, in thousands) 2021 2020 Other real estate owned $ 375 $ 504 Repossessed assets 18 45 Total other real estate owned and repossessed assets $ 393 $ 549

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Fair Values of Derivative Instruments on Balance Sheets	The table below presents the fair value of Wesbanco’s derivative financial instruments as well as their classification on the Balance Sheet as of March 31, 2021 and December 31, 2020: March 31, 2021 December 31, 2020 (unaudited, in thousands) Notional or Contractual Amount Asset Derivatives Liability Derivatives Notional or Contractual Amount Asset Derivatives Liability Derivatives Derivatives Loan Swaps: Interest rate swaps $ 710,986 $ 31,732 $ 32,470 $ 649,857 $ 46,418 $ 49,917 Other contracts: Interest rate loan commitments 85,435 — 314 112,119 702 — Forward TBA contracts 197,000 1,515 — 183,500 — 1,161 Total derivatives $ 33,247 $ 32,784 $ 47,120 $ 51,078
Summary of Effect of Derivative Instruments on Income Statement	The table below presents the change in the fair value of the Company’s derivative financial instruments reflected within non-interest income on the consolidated income statement for the three months ended March 31, 2021 and 2020, respectively. For the Three Months Ended March 31, (unaudited, in thousands) Location of Gain/(Loss) 2021 2020 Interest rate swaps Other income $ 2,761 $ (2,751 ) Interest rate loan commitments Mortgage banking income (1,016 ) (145 ) Forward TBA contracts Mortgage banking income 4,518 (2,657 ) Total $ 6,263 $ (5,553 )

Benefit Plans (Tables)

Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]
Schedule of Defined Benefit Pension Plan	The following table presents the net periodic pension cost for Wesbanco’s Defined Benefit Pension Plan (the “Plan”) and the related components: For the Three Months Ended March 31, (unaudited, in thousands) 2021 2020 Service cost – benefits earned during year $ 616 $ 568 Interest cost on projected benefit obligation 842 1,121 Expected return on plan assets (2,763 ) (2,594 ) Amortization of prior service cost (8 ) (9 ) Amortization of net loss 675 793 Net periodic pension income $ (638 ) $ (121 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis	The following tables set forth Wesbanco ’s financial assets and liabilities that were accounted for at fair value on a recurring and nonrecurring basis by level within the fair valu e hierarchy as of March 31, 2021 and December 31, 2020 : March 31, 2021 Fair Value Measurements Using: March 31, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (unaudited, in thousands) 2021 (level 1) (level 2) (level 3) Recurring fair value measurements Equity securities $ 13,123 $ 13,123 $ — $ — Available-for-sale debt securities U.S. Treasury 29,997 — 29,997 — U.S. Government sponsored entities and agencies 176,330 — 176,330 — Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 2,140,793 — 2,140,793 — Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 291,681 — 291,681 — Obligations of states and political subdivisions 111,798 — 110,287 1,511 Corporate debt securities 24,613 — 24,613 — Total available-for-sale debt securities $ 2,775,212 $ — $ 2,773,701 $ 1,511 Loans held for sale 153,520 — 153,520 — Other assets - interest rate derivatives agreements 31,732 — 31,732 — Total assets recurring fair value measurements $ 2,973,587 $ 13,123 $ 2,958,953 $ 1,511 Other liabilities - interest rate derivatives agreements $ 32,470 $ — $ 32,470 $ — Total liabilities recurring fair value measurements $ 32,470 $ — $ 32,470 $ — Nonrecurring fair value measurements Individually-evaluated nonperforming loans $ 1,909 $ — $ — $ 1,909 Other real estate owned and repossessed assets 393 — — 393 Total nonrecurring fair value measurements $ 2,302 $ — $ — $ 2,302 December 31, 2020 Fair Value Measurements Using: December 31, Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) 2020 (level 1) (level 2) (level 3) Recurring fair value measurements Equity securities $ 13,047 $ 13,047 $ — $ — Available-for-sale debt securities U.S. Treasury 39,982 — 39,982 — U.S. Government sponsored entities and agencies 211,682 — 211,682 — Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 1,264,737 — 1,264,737 — Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 320,098 — 320,098 — Obligations of states and political subdivisions 115,762 — 114,227 1,535 Corporate debt securities 25,875 — 25,875 — Total available-for-sale debt securities $ 1,978,136 $ — $ 1,976,601 $ 1,535 Loans held for sale 168,378 — 168,378 — Other assets - interest rate derivatives agreements 46,418 — 46,418 — Total assets recurring fair value measurements $ 2,205,979 $ 13,047 $ 2,191,397 $ 1,535 Other liabilities - interest rate derivatives agreements $ 49,917 $ — $ 49,917 $ — Total liabilities recurring fair value measurements $ 49,917 $ — $ 49,917 $ — Nonrecurring fair value measurements Individually-evaluated nonperforming loans $ 1,958 $ — $ — $ 1,958 Other real estate owned and repossessed assets 549 — — 549 Total nonrecurring fair value measurements $ 2,507 $ — $ — $ 2,507
Schedule of Assets Measured at Fair Value on Nonrecurring Basis	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which Wesbanco has utilized level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements Fair Value Valuation Unobservable Range (Weighted (unaudited, in thousands) Estimate Techniques Input Average) March 31, 2021 Individually-evaluated nonperforming loans $ 1,909 Appraisal of collateral (1) Appraisal adjustments (2) (30.0%)/(30.0%) Liquidation expenses (2) (5.6%)/(5.6%) Other real estate owned and repossessed assets $ 393 Appraisal of collateral (1), (3) December 31, 2020 Individually-evaluated nonperforming loans $ 1,958 Appraisal of collateral (1) Appraisal adjustments (2) (30.0%)/(30.0%) Liquidation expenses (2) (5.6%)/(5.6%) Other real estate owned and repossessed assets $ 549 Appraisal of collateral (1), (3) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs, which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of appraisal adjustments and liquidation expense are presented as a percent of the appraisal. (3) Includes estimated liquidation expenses and numerous dissimilar qualitative adjustments by management, which are not identifiable.
Estimates Fair Values of Financial Instruments	Fair Value Measurements at March 31, 2021 Carrying Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (unaudited, in thousands) Amount Estimate (level 1) (level 2) (level 3) Financial Assets Cash and due from banks $ 759,048 $ 759,048 $ 759,048 $ — $ — Equity securities 13,123 13,123 13,123 — — Available-for-sale debt securities 2,775,212 2,775,212 — 2,773,701 1,511 Held-to-maturity debt securities 813,450 839,872 — 839,411 461 Net loans 10,543,272 10,540,445 — — 10,540,445 Loans held for sale 153,520 153,520 — 153,520 — Other assets - interest rate derivatives 31,732 31,732 — 31,732 — Accrued interest receivable 68,896 68,896 68,896 — — Financial Liabilities Deposits 13,286,999 13,300,728 11,731,925 1,568,803 — Federal Home Loan Bank borrowings 433,984 438,211 — 438,211 — Other borrowings 137,218 125,925 125,925 — — Subordinated debt and junior subordinated debt 192,430 172,142 — 105,371 66,771 Other liabilities - interest rate derivatives 32,470 32,470 — 32,470 — Accrued interest payable 3,224 3,224 3,224 — — Fair Value Measurements at December 31, 2020 Carrying Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Amount Estimate (level 1) (level 2) (level 3) Financial Assets Cash and due from banks $ 905,447 $ 905,447 $ 905,447 $ — $ — Equity securities 13,047 13,047 13,047 — — Available-for-sale debt securities 1,978,136 1,978,136 — 1,976,601 1,535 Held-to-maturity debt securities 730,886 768,183 — 767,720 463 Net loans 10,603,406 10,802,883 — — 10,802,883 Loans held for sale 168,378 168,378 — 168,378 — Other assets - interest rate derivatives 46,418 46,418 — 46,418 — Accrued interest receivable 66,790 66,790 66,790 — — Financial Liabilities Deposits 12,429,373 12,439,981 10,810,863 1,629,118 — Federal Home Loan Bank borrowings 549,003 555,375 — 555,375 — Other borrowings 241,950 235,796 235,796 — — Subordinated debt and junior subordinated debt 192,291 174,452 — 105,768 68,684 Other liabilities - interest rate derivatives 49,917 49,917 — 49,917 — Accrued interest payable 4,314 4,314 4,314 — —

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue Recognition [Abstract]
Summary of Revenue Recognition	The following table summarizes the point of revenue recognition and the income recognized for each of the revenue streams for the three months ended March 31, 2021 and 2020, respectively: Point of Revenue For the Three Months Ended March 31, (unaudited, in thousands) Recognition 2021 2020 Revenue Streams Trust fees Trust account fees Over time $ 5,313 $ 4,857 WesMark fees Over time 2,318 2,095 Total trust fees 7,631 6,952 Service charges on deposits Commercial banking fees Over time 564 585 Personal service charges At a point in time and over time 4,330 6,032 Total service charges on deposits 4,894 6,617 Net securities brokerage revenue Annuity commissions At a point in time 917 1,038 Equity and debt security trades At a point in time 76 159 Managed money Over time 283 235 Trail commissions Over time 248 247 Total net securities brokerage revenue 1,524 1,679 Debit card sponsorship income (1) At a point in time and over time 646 708 Payment processing fees (1) At a point in time and over time 713 680 Electronic banking fees At a point in time 4,365 4,254 Mortgage banking income At a point in time 4,264 1,276 Net gain on other real estate owned and other assets At a point in time 175 169 (1)

Comprehensive Income_(Loss) (Ta

Comprehensive Income/(Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Components of Accumulated Other Comprehensive Income	The activity in accumulated other comprehensive income for the three months ended March 31, 2021 and 2020 is as follows: Accumulated Other Comprehensive Income/(Loss) (1) (unaudited, in thousands) Defined Benefit Plans Unrealized Gains (Losses) on Debt Securities Available-for-Sale Unrealized Gains on Debt Securities Transferred from Available-for-Sale to Held-to-Maturity Total Balance at December 31, 2020 $ (15,502 ) $ 46,861 $ — $ 31,359 Other comprehensive income/(loss) before reclassifications — (22,026 ) — (22,026 ) Amounts reclassified from accumulated other comprehensive income/(loss) 472 (2 ) — 470 Period change 472 (22,028 ) — (21,556 ) Balance at March 31, 2021 $ (15,030 ) $ 24,833 $ — $ 9,803 Balance at December 31, 2019 $ (17,468 ) $ 18,644 $ 25 $ 1,201 Other comprehensive income/(loss) before reclassifications — 41,116 — 41,116 Amounts reclassified from accumulated other comprehensive income/(loss) 569 (1,743 ) (2 ) (1,176 ) Period change 569 39,373 (2 ) 39,940 Balance at March 31, 2020 $ (16,899 ) $ 58,017 $ 23 $ 41,141 (1 ) All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 24% in both periods presented.
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income	The following table provides details about amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020: Details about Accumulated Other Comprehensive Income/(Loss) Components For the Three Months Ended March 31, Affected Line Item in the Statement of Comprehensive Income (unaudited, in thousands) 2021 2020 Debt securities available-for-sale (1) Net securities gains reclassified into earnings $ (3 ) $ (2,287 ) Net securities gains (Non-interest income) Related income tax expense ⁽²⁾ 1 544 Provision for income taxes Net effect on accumulated other comprehensive income for the period (2 ) (1,743 ) Debt securities held-to-maturity (1) Amortization of unrealized gain transferred from available-for-sale — (3 ) Interest and dividends on securities (Interest and dividend income) Related income tax expense ⁽²⁾ — 1 Provision for income taxes Net effect on accumulated other comprehensive income for the period — (2 ) Defined benefit plans (3) Amortization of net loss and prior service costs 622 746 Employee benefits (Non-interest expense) Related income tax benefit ⁽²⁾ (150 ) (177 ) Provision for income taxes Net effect on accumulated other comprehensive income for the period 472 569 Total reclassifications for the period $ 470 $ (1,176 ) (1) (2) Income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 24% in both periods presented. (3) Included in the computation of net periodic pension cost. See Note 6, “Benefit Plans” for additional detail.

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding	The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding: March 31, December 31, (unaudited, in thousands) 2021 2020 Lines of credit $ 2,497,734 $ 2,510,011 Loans approved but not closed 470,736 381,180 Overdraft limits 153,374 154,322 Letters of credit 53,136 53,788 Contingent obligations and other guarantees 199,066 126,984

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Financial Information by Business Segment	Condensed financial information by business segment is presented below: Trust and Community Investment (unaudited, in thousands) Banking Services Consolidated For The Three Months Ended March 31, 2021 Interest and dividend income $ 125,054 $ — $ 125,054 Interest expense 8,576 — 8,576 Net interest income 116,478 — 116,478 Provision for credit losses (27,958 ) — (27,958 ) Net interest income after provision for credit losses 144,436 — 144,436 Non-interest income 25,577 7,631 33,208 Non-interest expense 82,011 4,316 86,327 Income before provision for income taxes 88,002 3,315 91,317 Provision for income taxes 17,506 696 18,202 Net income 70,496 2,619 73,115 Preferred stock dividends 2,531 — 2,531 Net income available to common shareholders $ 67,965 $ 2,619 $ 70,584 For The Three Months Ended March 31, 2020 Interest and dividend income $ 142,448 $ — $ 142,448 Interest expense 22,286 — 22,286 Net interest income 120,162 — 120,162 Provision for credit losses 29,821 — 29,821 Net interest income after provision for credit losses 90,341 — 90,341 Non-interest income 21,057 6,952 28,009 Non-interest expense 86,918 4,415 91,333 Income before provision for income taxes 24,480 2,537 27,017 Provision for income taxes 3,088 533 3,621 Net income available to common shareholders $ 21,392 $ 2,004 $ 23,396

Earnings Per Common Share - Sum

Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator for both basic and diluted earnings per common share:
Net income available to common shareholders	$ 70,584	$ 23,396
Denominator:
Total average basic common shares outstanding	67,263,714	67,486,550
Effect of dilutive stock options and other stock compensation	91,704	100,896
Total diluted average common shares outstanding	67,355,418	67,587,446
Earnings per common share - basic	$ 1.05	$ 0.35
Earnings per common share - diluted	$ 1.05	$ 0.35

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock Option [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Securities excluded from computation of net income per diluted shares	393,961	510,186
Restricted Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan	0	25,618

Securities - Schedule of Fair V

Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 2,742,482	$ 1,916,658
Available-for-sale, Gross Unrealized Gains	50,154	63,237
Available-for-sale, Gross Unrealized Losses	(17,424)	(1,759)
Available-for-sale, Estimated Fair Value	2,775,212	1,978,136
Held-to-maturity, Amortized Cost	813,740	731,212
Held-to-maturity, Gross Unrealized Gains	29,948	37,030
Held-to-maturity, Gross Unrealized Losses	(3,816)	(59)
Held-to-maturity securities, Fair value	839,872	768,183
Total securities, Amortized Cost	3,556,222	2,647,870
Total securities, Gross Unrealized Gains	80,102	100,267
Total securities, Gross Unrealized Losses	(21,240)	(1,818)
Total securities, Estimated Fair Value	3,615,084	2,746,319
US Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	29,986	39,975
Available-for-sale, Gross Unrealized Gains	11	7
Available-for-sale, Estimated Fair Value	29,997	39,982
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	174,472	204,109
Available-for-sale, Gross Unrealized Gains	4,564	7,715
Available-for-sale, Gross Unrealized Losses	(2,706)	(142)
Available-for-sale, Estimated Fair Value	176,330	211,682
Held-to-maturity, Amortized Cost	7,611	7,779
Held-to-maturity, Gross Unrealized Gains	106	265
Held-to-maturity securities, Fair value	7,717	8,044
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	2,123,853	1,230,106
Available-for-sale, Gross Unrealized Gains	30,901	35,979
Available-for-sale, Gross Unrealized Losses	(13,961)	(1,348)
Available-for-sale, Estimated Fair Value	2,140,793	1,264,737
Held-to-maturity, Amortized Cost	80,376	89,151
Held-to-maturity, Gross Unrealized Gains	2,738	3,251
Held-to-maturity, Gross Unrealized Losses	(5)
Held-to-maturity securities, Fair value	83,109	92,402
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	284,440	308,903
Available-for-sale, Gross Unrealized Gains	7,962	11,464
Available-for-sale, Gross Unrealized Losses	(721)	(269)
Available-for-sale, Estimated Fair Value	291,681	320,098
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	105,778	108,602
Available-for-sale, Gross Unrealized Gains	6,056	7,160
Available-for-sale, Gross Unrealized Losses	(36)
Available-for-sale, Estimated Fair Value	111,798	115,762
Held-to-maturity, Amortized Cost	692,616	601,128
Held-to-maturity, Gross Unrealized Gains	24,501	30,173
Held-to-maturity, Gross Unrealized Losses	(3,811)	(59)
Held-to-maturity securities, Fair value	713,306	631,242
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	23,953	24,963
Available-for-sale, Gross Unrealized Gains	660	912
Available-for-sale, Estimated Fair Value	24,613	25,875
Held-to-maturity, Amortized Cost	33,137	33,154
Held-to-maturity, Gross Unrealized Gains	2,603	3,341
Held-to-maturity securities, Fair value	$ 35,740	$ 36,495

Securities - Schedule of Fair_2

Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Allowance for credit losses, held-to-maturity debt securities	$ 290	$ 326

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)Holding	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)Holding
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Maximum percentage of equity of one issuer	10.00%
Number of holdings greater than specified percentage of equity | Holding	0		0
Equities securities	$ 13,123		$ 13,047
Securities with an aggregate fair value	1,800,000		1,800,000
Proceeds from sale of available-for-sale securities	0	$ 222,668
Net unrealized gains on available-for-sale securities included in AOCI	24,800		46,900
Accrued interest receivable	68,896		66,790
Federal home loan bank stock, Total	29,300		34,000
Us Government Securities and Mortgage Backed and Collateralized Securities Issued By Direct Governmental Entity or Government-Sponsored Entity [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated credit losses	0
Held-to-maturity Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Accrued interest receivable	6,300		$ 5,300
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities	$ 10,100

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost And Fair Value Debt Securities [Abstract]
Total available-for-sale debt securities, Amortized Cost, Less than one year	$ 47,465
Total available-for-sale debt securities, Amortized Cost, 1-5 years	145,739
Total available-for-sale debt securities, Amortized Cost, 5-10 years	358,854
Total available-for-sale debt securities, Amortized Cost, Over 10 years	2,190,424
Available-for-sale, Amortized Cost	2,742,482	$ 1,916,658
Total held-to-maturity debt securities, Amortized Cost, Less than one year	11,759
Total held-to-maturity debt securities, Amortized Cost, 1-5 years	133,053
Total held-to-maturity debt securities, Amortized Cost, 5-10 years	228,148
Total held-to-maturity debt securities, Amortized Cost, Over 10 years	440,780
Held-to-maturity, Amortized Cost	813,740	731,212
Total debt securities, Amortized Cost	3,556,222
Total available-for-sale debt securities, Fair Value, Less than one year	47,583
Total available-for-sale debt securities, Fair Value, 1-5 years	152,800
Total available-for-sale debt securities, Fair Value, 5-10 years	366,119
Total available-for-sale debt securities, Fair Value, Over 10 years	2,208,710
Total available-for-sale debt securities, Fair Value	2,775,212	1,978,136
Total held-to-maturity debt securities, Fair Value, Less than one year	11,872
Total held-to-maturity debt securities, Fair Value, 1-5 years	140,315
Total held-to-maturity debt securities, Fair Value, 5-10 years	237,907
Total held-to-maturity debt securities, Fair Value, Over 10 years	449,778
Total held-to-maturity debt securities, Fair Value	839,872	768,183
Total debt securities, Fair Value	$ 3,615,084	$ 2,746,319

Securities - Schedule of Gross

Securities - Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities as well as Gains and Losses on Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Available-for-Sale Securities, Gross Unrealized Gain (Loss) [Line Items]
Net securities gains	$ 279	$ 1,491
Debt Securities [Member]
Available-for-Sale Securities, Gross Unrealized Gain (Loss) [Line Items]
Gross realized gains	140	3,335
Gross realized losses	(39)	(1,031)
Net gains on debt securities	101	2,304
Equity Securities
Available-for-Sale Securities, Gross Unrealized Gain (Loss) [Line Items]
Net unrealized gains (losses) recognized on securities still held	178	(805)
Net realized losses recognized on securities sold		(8)
Net gains (losses) on equity securities	$ 178	$ (813)

Securities - Schedule of Allowa

Securities - Schedule of Allowance for Credit Losses on Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Beginning balance	$ 326
Ending balance	290
ASU 2016-13 [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Beginning balance	326
Impact of adopting ASC 326		$ 229
Current period provision	(36)	7
Ending balance	290	236
ASU 2016-13 [Member] | Obligations of State and Political Subdivisions [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Beginning balance	130
Impact of adopting ASC 326		96
Current period provision	(12)	2
Ending balance	118	98
ASU 2016-13 [Member] | Corporate Debt Securities [Member]
Debt Securities Heldtomaturity Allowance For Credit Loss [Line Items]
Beginning balance	196
Impact of adopting ASC 326		133
Current period provision	(24)	5
Ending balance	$ 172	$ 138

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands	Mar. 31, 2021USD ($)Security	Dec. 31, 2020USD ($)Security
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 1,128,184	$ 340,022
Less than 12 months, Unrealized Losses	$ (17,342)	$ (1,638)
Less than 12 months, Number of Securities | Security	114	53
12 months or more, Fair Value	$ 3,531	$ 4,136
12 months or more, Unrealized Losses	$ (82)	$ (121)
12 months or more, Number of Securities | Security	4	3
Fair Value, Total	$ 1,131,715	$ 344,158
Unrealized Losses, Total	$ (17,424)	$ (1,759)
Number of Securities Total | Security	118	56
U.S. Government Sponsored Entities and Agencies [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 56,270	$ 18,308
Less than 12 months, Unrealized Losses	$ (2,706)	$ (142)
Less than 12 months, Number of Securities | Security	6	2
Fair Value, Total	$ 56,270	$ 18,308
Unrealized Losses, Total	$ (2,706)	$ (142)
Number of Securities Total | Security	6	2
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 973,961	$ 224,448
Less than 12 months, Unrealized Losses	$ (13,879)	$ (1,227)
Less than 12 months, Number of Securities | Security	98	41
12 months or more, Fair Value	$ 3,531	$ 4,136
12 months or more, Unrealized Losses	$ (82)	$ (121)
12 months or more, Number of Securities | Security	4	3
Fair Value, Total	$ 977,492	$ 228,584
Unrealized Losses, Total	$ (13,961)	$ (1,348)
Number of Securities Total | Security	102	44
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 94,186	$ 97,266
Less than 12 months, Unrealized Losses	$ (721)	$ (269)
Less than 12 months, Number of Securities | Security	9	10
Fair Value, Total	$ 94,186	$ 97,266
Unrealized Losses, Total	$ (721)	$ (269)
Number of Securities Total | Security	9	10
Obligations of State and Political Subdivisions [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 3,767
Less than 12 months, Unrealized Losses	$ (36)
Less than 12 months, Number of Securities | Security	1
Fair Value, Total	$ 3,767
Unrealized Losses, Total	$ (36)
Number of Securities Total | Security	1

Loans and the Allowance for C_3

Loans and the Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)ContractLoan	Dec. 31, 2020USD ($)Contract
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan income	$ 13,300,000	$ 6,200,000
Un-accreted discount on purchased loans from acquisitions	$ 35,900,000	39,400,000
Percentage of national unemployment projection	5.80%
Expected average percentage of national unemployment in future	4.80%
Calculation period of reversion	1 year
Reserve on accrued interest related to CARES Act	$ 200,000
Accrued interest receivable for loans	53,500,000
Accrued interest receivable for loans related to CARES Act	24,900,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard	29,400,000	27,700,000
Internally assigned loan grades to residential real estate, home equity and consumer loans	5,500,000	4,100,000
Unfunded commercial loan commitments	$ 28,300,000	$ 28,700,000
Number of restructured contracts greater than $1 million | Contract	0	0
Threshold for TDR	$ 1,000,000	$ 1,000,000
Accruing and non accrual TDR permitted interest-only payment period	6 months
Unfunded commitments to debtors for nonperforming loans	$ 900,000	900,000
Number of loans modified | Loan	3,553
Total loan amount modified CARES Act	$ 2,200,000,000
Loan amount remaining in deferral period CARES Act	$ 200,000,000
Description of deferred payments to customers impacted by the COVID-19 pandemic	Wesbanco originally offered three to six months of deferred payments to commercial and retail customers impacted by the COVID-19 pandemic depending on the type of loan and the industry for commercial loans. In the fourth quarter of 2020, Wesbanco offered up to an additional twelve months of deferred payments to certain commercial loan customers, predominantly in the hospitality industry, based on specific criteria related to the borrower, the underlying property and the potential for guarantors / co-borrowers.
Other real estate owned	$ 375,000	504,000
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Other real estate owned	100,000	100,000
Foreclosure proceedings in process on residential real estate loans	4,300,000	4,100,000
PPP Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan income	21,400,000	$ 13,800,000
Commercial and Industrial [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Annual sales of borrowers	$ 100,000,000

Loans and the Allowance for C_4

Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 10,703,312	$ 10,789,233
Loans held for sale	153,520	168,378
Total loans	10,856,832	10,957,611
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	1,598,921	1,681,182
Commercial And Industrial - PPP [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	823,814	726,256
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	5,712,742	5,705,392
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	642,017	668,277
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	5,070,725	5,037,115
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	1,644,422	1,720,961
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	289,395	309,055
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 634,018	$ 646,387

Loans and the Allowance for C_5

Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	$ 185,827	$ 52,429
Allowance for credit losses - loan commitments, beginning balance	9,514	874
Total beginning allowance for credit losses - loans and loan commitments	195,341	53,303
Provision for loan losses	(25,139)	28,072
Provision for loan commitments	(2,783)	1,743
Total provision for credit losses - loans and loan commitments	(27,922)	29,815
Charge-offs	(2,460)	(6,126)
Recoveries	1,812	1,410
Net charge-offs	(648)	(4,716)
Allowance for credit losses - loans, ending balance	160,040	114,272
Allowance for credit losses - loan commitments, ending balance	6,731	5,572
Total ending allowance for credit losses - loans and loan commitments	166,771	119,844
ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		41,442
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	37,850	14,116
Allowance for credit losses - loan commitments, beginning balance	1,275	311
Total beginning allowance for credit losses - loans and loan commitments	39,125	14,427
Provision for loan losses	(4,256)	5,632
Provision for loan commitments	308	(582)
Total provision for credit losses - loans and loan commitments	(3,948)	5,050
Charge-offs	(750)	(2,714)
Recoveries	440	107
Net charge-offs	(310)	(2,607)
Allowance for credit losses - loans, ending balance	33,284	39,227
Allowance for credit losses - loan commitments, ending balance	1,583
Total ending allowance for credit losses - loans and loan commitments	34,867	39,227
Commercial and Industrial [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		22,357
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	639	1,387
Total beginning allowance for credit losses - loans and loan commitments	639	1,387
Provision for loan losses	156	(351)
Total provision for credit losses - loans and loan commitments	156	(351)
Charge-offs	(201)	(328)
Recoveries	113	143
Net charge-offs	(88)	(185)
Allowance for credit losses - loans, ending balance	707	1,064
Total ending allowance for credit losses - loans and loan commitments	707	1,064
Deposit Overdrafts [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		213
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	10,841	4,949
Allowance for credit losses - loan commitments, beginning balance	6,508	235
Total beginning allowance for credit losses - loans and loan commitments	17,349	5,184
Provision for loan losses	(3,538)	2,564
Provision for loan commitments	(2,508)	2,274
Total provision for credit losses - loans and loan commitments	(6,046)	4,838
Charge-offs	(18)	(1)
Recoveries	55	8
Net charge-offs	37	7
Allowance for credit losses - loans, ending balance	7,340	6,442
Allowance for credit losses - loan commitments, ending balance	4,000	5,111
Total ending allowance for credit losses - loans and loan commitments	11,340	11,553
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		1,524
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	110,652	20,293
Allowance for credit losses - loan commitments, beginning balance	712	22
Total beginning allowance for credit losses - loans and loan commitments	111,364	20,315
Provision for loan losses	(11,420)	20,585
Provision for loan commitments	(504)
Total provision for credit losses - loans and loan commitments	(11,924)	20,585
Charge-offs	(19)	(1,398)
Recoveries	528	293
Net charge-offs	509	(1,105)
Allowance for credit losses - loans, ending balance	99,741	52,873
Allowance for credit losses - loan commitments, ending balance	208
Total ending allowance for credit losses - loans and loan commitments	99,949	52,873
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		13,078
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	17,851	4,311
Allowance for credit losses - loan commitments, beginning balance	955	15
Total beginning allowance for credit losses - loans and loan commitments	18,806	4,326
Provision for loan losses	(4,177)	237
Provision for loan commitments	(86)	49
Total provision for credit losses - loans and loan commitments	(4,263)	286
Charge-offs	(371)	(386)
Recoveries	135	272
Net charge-offs	(236)	(114)
Allowance for credit losses - loans, ending balance	13,438	9,684
Allowance for credit losses - loan commitments, ending balance	869	444
Total ending allowance for credit losses - loans and loan commitments	14,307	10,128
Residential Real Estate [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		5,630
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	6,507	2,951
Allowance for credit losses - loan commitments, beginning balance	19	41
Total beginning allowance for credit losses - loans and loan commitments	6,526	2,992
Provision for loan losses	(1,510)	(1,241)
Provision for loan commitments	2
Total provision for credit losses - loans and loan commitments	(1,508)	(1,241)
Charge-offs	(927)	(856)
Recoveries	462	415
Net charge-offs	(465)	(441)
Allowance for credit losses - loans, ending balance	4,532	3,886
Allowance for credit losses - loan commitments, ending balance	21
Total ending allowance for credit losses - loans and loan commitments	4,553	3,886
Consumer [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		2,576
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses - loans, beginning balance	1,487	4,422
Allowance for credit losses - loan commitments, beginning balance	45	250
Total beginning allowance for credit losses - loans and loan commitments	1,532	4,672
Provision for loan losses	(394)	646
Provision for loan commitments	5	2
Total provision for credit losses - loans and loan commitments	(389)	648
Charge-offs	(174)	(443)
Recoveries	79	172
Net charge-offs	(95)	(271)
Allowance for credit losses - loans, ending balance	998	1,096
Allowance for credit losses - loan commitments, ending balance	50	17
Total ending allowance for credit losses - loans and loan commitments	$ 1,048	1,113
Home Equity [Member] | ASU 2016-13 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan losses		$ (3,936)

Loans and the Allowance for C_6

Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 6,039	$ 6,282
Allowance for loans collectively evaluated for impairment	154,001	179,545
Allowance for loan commitments	6,731	9,514	$ 5,572	$ 874
Total allowance for credit losses - loans and commitments	166,771	195,341	119,844	53,303
Individually evaluated for credit loss	43,121	44,690
Collectively-evaluated for credit losses	10,660,191	10,744,543
Total loans	10,703,312	10,789,233
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	1,501	1,484
Allowance for loans collectively evaluated for impairment	31,783	36,366
Allowance for loan commitments	1,583	1,275		311
Total allowance for credit losses - loans and commitments	34,867	39,125	39,227	14,427
Individually evaluated for credit loss	1,838	2,863
Collectively-evaluated for credit losses	2,420,897	2,404,575
Total loans	2,422,735	2,407,438
Deposit Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	707	639
Total allowance for credit losses - loans and commitments	707	639	1,064	1,387
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,712,742	5,705,392
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	503	602
Allowance for loans collectively evaluated for impairment	6,837	10,239
Allowance for loan commitments	4,000	6,508	5,111	235
Total allowance for credit losses - loans and commitments	11,340	17,349	11,553	5,184
Individually evaluated for credit loss	1,125	1,455
Collectively-evaluated for credit losses	640,892	666,822
Total loans	642,017	668,277
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	4,035	4,196
Allowance for loans collectively evaluated for impairment	95,706	106,456
Allowance for loan commitments	208	712		22
Total allowance for credit losses - loans and commitments	99,949	111,364	52,873	20,315
Individually evaluated for credit loss	40,158	40,372
Collectively-evaluated for credit losses	5,030,567	4,996,743
Total loans	5,070,725	5,037,115
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	13,438	17,851
Allowance for loan commitments	869	955	444	15
Total allowance for credit losses - loans and commitments	14,307	18,806	10,128	4,326
Collectively-evaluated for credit losses	1,644,422	1,720,961
Total loans	1,644,422	1,720,961
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	4,532	6,507
Allowance for loan commitments	21	19		41
Total allowance for credit losses - loans and commitments	4,553	6,526	3,886	2,992
Collectively-evaluated for credit losses	289,395	309,055
Total loans	289,395	309,055
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	998	1,487
Allowance for loan commitments	50	45	17	250
Total allowance for credit losses - loans and commitments	1,048	1,532	$ 1,113	$ 4,672
Collectively-evaluated for credit losses	634,018	646,387
Total loans	$ 634,018	$ 646,387

Loans and the Allowance for C_7

Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Troubled debt restructuring threshold	$ 1	$ 1

Loans and the Allowance for C_8

Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	$ 10,703,312	$ 10,789,233
Commercial and Industrial [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	2,422,735	2,407,438
Commercial and Industrial [Member] | Pass [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	2,365,558	2,350,724
Commercial and Industrial [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	37,782	34,597
Commercial and Industrial [Member] | Classified - substandard [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	19,395	22,117
Commercial Portfolio Segment [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	8,135,477	8,112,830
Commercial Portfolio Segment [Member] | Pass [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	7,679,650	7,617,885
Commercial Portfolio Segment [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	340,943	362,295
Commercial Portfolio Segment [Member] | Classified - substandard [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	114,884	132,650
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	642,017	668,277
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] | Pass [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	634,835	657,435
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	5,360	7,397
Commercial Portfolio Segment [Member] | Commercial Real Estate - Land and Construction [Member] | Classified - substandard [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	1,822	3,445
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	5,070,725	5,037,115
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] | Pass [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	4,679,257	4,609,726
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	297,801	320,301
Commercial Portfolio Segment [Member] | Commercial Real Estate - Improved Property [Member] | Classified - substandard [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	93,667	107,088
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	2,422,735	2,407,438
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	2,365,558	2,350,724
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	37,782	34,597
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Classified - substandard [Member]
Summary of commercial loans by risk grade
Portfolio loans, net of unearned income	$ 19,395	$ 22,117

Loans and the Allowance for C_9

Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Current	$ 10,644,956	$ 10,721,084
Total Past Due	58,356	68,149
Total loans	10,703,312	10,789,233
90 Days or More Past Due and Accruing	12,824	8,846
Loans held for sale, current	153,520	168,378
Loans held for sale	153,520	168,378
Total loans, current	10,798,476	10,889,462
Total loans	10,856,832	10,957,611
Total Non-performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	13,208	13,100
Total Past Due	24,930	27,707
Total loans	38,138	40,807
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	628,773	639,319
Total Past Due	5,245	7,068
Total loans	634,018	646,387
90 Days or More Past Due and Accruing	784	706
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	5,694,797	5,681,802
Total Past Due	17,945	23,590
Total loans	5,712,742	5,705,392
90 Days or More Past Due and Accruing	2,596	3,001
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	1,625,328	1,698,636
Total Past Due	19,094	22,325
Total loans	1,644,422	1,720,961
90 Days or More Past Due and Accruing	4,007	2,863
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	287,395	305,483
Total Past Due	2,000	3,572
Total loans	289,395	309,055
90 Days or More Past Due and Accruing	123	377
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	639,378	664,990
Total Past Due	2,639	3,287
Total loans	642,017	668,277
90 Days or More Past Due and Accruing	641	288
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	5,055,419	5,016,812
Total Past Due	15,306	20,303
Total loans	5,070,725	5,037,115
90 Days or More Past Due and Accruing	1,955	2,713
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	2,408,663	2,395,844
Total Past Due	14,072	11,594
Total loans	2,422,735	2,407,438
90 Days or More Past Due and Accruing	5,314	1,899
Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	9,960	9,560
Total Past Due	24,615	27,320
Total loans	34,575	36,880
TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	3,248	3,540
Total Past Due	315	387
Total loans	3,563	3,927
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	15,338	16,856
30-59 Days Past Due [Member] | Total Non-performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,003	693
30-59 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,213	2,414
Total loans	1,213	2,414
30-59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	5,161	5,458
30-59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	2,713	2,614
Total loans	2,713	2,614
30-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,428	1,998
Total loans	1,428	1,998
30-59 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,120	582
30-59 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	4,041	4,876
30-59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	4,823	4,372
30-59 Days Past Due [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	940	630
30-59 Days Past Due [Member] | TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	63	63
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	7,526	16,051
60-89 Days Past Due [Member] | Total Non-performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,259	618
60-89 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	197	775
Total loans	197	775
60-89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	2,743	6,394
60-89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,589	5,654
Total loans	1,589	5,654
60-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	340	1,031
Total loans	340	1,031
60-89 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	759	2,276
60-89 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,984	4,118
60-89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	2,657	2,197
60-89 Days Past Due [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,100	466
60-89 Days Past Due [Member] | TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	159	152
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	35,492	35,242
90 Days or More Past Due [Member] | Total Non-performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	22,668	26,396
90 Days or More Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	3,835	3,879
Total loans	3,835	3,879
90 Days or More Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	10,041	11,738
90 Days or More Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	14,792	14,057
Total loans	14,792	14,057
90 Days or More Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	232	543
Total loans	232	543
90 Days or More Past Due [Member] | Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	760	429
90 Days or More Past Due [Member] | Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	9,281	11,309
90 Days or More Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	6,592	5,025
90 Days or More Past Due [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	22,575	26,224
90 Days or More Past Due [Member] | TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	$ 93	$ 172

Loans and the Allowance for _10

Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2021
Receivables [Abstract]
Past due loans excluded TDRs past due and accruing	90 days

Loans and the Allowance for _11

Loans and the Allowance for Credit Losses - Summary of Nonperforming Loans (Detail) - Nonperforming Loans [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	$ 41,433		$ 44,759
Recorded Investment, With no specific allowance recorded	36,054		38,713
Unpaid Principal Balance, With a specific allowance recorded	2,094		2,094
Recorded Investment, With a specific allowance recorded	2,084		2,094
Related Allowance, With a specific allowance recorded	175		136
Total impaired loans, Unpaid principal balance	43,527		46,853
Total impaired loans, Recorded investment	38,138		40,807
Total impaired loans, Related Allowance	175		136
Average recorded investment, with no related specific allowance	37,385	$ 39,135
Interest income recognized, With no related specific allowance	55	85
Average recorded investment, With a specific allowance recorded	2,089	5,941
Total impaired loans, Average recorded investment	39,474	45,076
Total impaired loans, Interest income recognized	55	85
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	23,605		23,055
Recorded Investment, With no specific allowance recorded	20,990		20,704
Average recorded investment, with no related specific allowance	20,847	18,470
Interest income recognized, With no related specific allowance	39	55
Average recorded investment, With a specific allowance recorded		2,196
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	593		602
Recorded Investment, With no specific allowance recorded	351		364
Average recorded investment, with no related specific allowance	358	390
Interest income recognized, With no related specific allowance		1
Average recorded investment, With a specific allowance recorded		27
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	6,518		6,635
Recorded Investment, With no specific allowance recorded	5,569		5,708
Average recorded investment, with no related specific allowance	5,639	5,811
Interest income recognized, With no related specific allowance	6	6
Average recorded investment, With a specific allowance recorded		352
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	138		469
Recorded Investment, With no specific allowance recorded	120		469
Average recorded investment, with no related specific allowance	295	393
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	8,719		9,597
Recorded Investment, With no specific allowance recorded	7,349		8,055
Unpaid Principal Balance, With a specific allowance recorded	2,094		2,094
Recorded Investment, With a specific allowance recorded	2,084		2,094
Related Allowance, With a specific allowance recorded	175		136
Average recorded investment, with no related specific allowance	7,702	5,501
Interest income recognized, With no related specific allowance	9	20
Average recorded investment, With a specific allowance recorded	2,089	3,270
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	1,860		4,401
Recorded Investment, With no specific allowance recorded	1,675		$ 3,413
Average recorded investment, with no related specific allowance	2,544	8,570
Interest income recognized, With no related specific allowance	$ 1	3
Average recorded investment, With a specific allowance recorded		$ 96

Loans and the Allowance for _12

Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 34,575	$ 36,880
TDRs	5,331	5,755
Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	3,563	3,927
Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,768	1,828
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	1,571	3,302
TDRs	104	111
Commercial and Industrial [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	104	111
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	5,181	5,345
TDRs	641	663
Home Equity [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	388	363
Home Equity [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	253	300
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	9,127	9,963
TDRs	583	820
Commercial Real Estate [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	426	655
Commercial Real Estate [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	157	165
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	120	469
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	9,007	9,494
TDRs	583	820
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	426	655
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	157	165
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	18,358	17,925
TDRs	3,985	4,133
Residential Real Estate [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	2,632	2,779
Residential Real Estate [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,353	1,354
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	338	345
TDRs	18	28
Consumer [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	13	19
Consumer [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	$ 5	$ 9

Loans and the Allowance for _13

Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Parenthetical) (Detail)	Mar. 31, 2021USD ($)Borrower	Dec. 31, 2020USD ($)Borrower
Receivables [Abstract]
Number of borrowers with loan balance greater than one million | Borrower	1	1
Borrowers with large amount of loans outstanding, minimum amount of loans per borrower	$ 1,000,000	$ 1,000,000
Borrowers with large amount of loans outstanding, net	$ 2,100,000	$ 2,100,000

Loans and the Allowance for _14

Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	2
Pre-Modification Outstanding Recorded Investment	$ 332
Post-Modification Outstanding Recorded Investment	$ 330
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	2
Pre-Modification Outstanding Recorded Investment	$ 332
Post-Modification Outstanding Recorded Investment	$ 330

Loans and the Allowance for _15

Loans and the Allowance for Credit Losses - TDRs Defaulted Later Restructured (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)Default
Financing Receivable, Modifications [Line Items]
Number of Defaults | Default	2
Recorded Investment | $	$ 168
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults | Default	1
Recorded Investment | $	$ 13
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults | Default	1
Recorded Investment | $	$ 155

Loans and the Allowance for _16

Loans and the Allowance for Credit Losses - Summary of Amortized Cost Basis Loan Balances by Year of Origination and Credit Quality Indicator (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, net of unearned income	$ 10,703,312		$ 10,789,233
Current-period gross write-offs	(2,460)	$ (6,126)
Current-period recoveries	1,812	1,410
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	4,724		18,315
Amortized Cost Basis by Origination Year 2020	15,055		3,611
Amortized Cost Basis by Origination Year 2019	3,290		3,376
Amortized Cost Basis by Origination Year 2018	2,978		1,131
Amortized Cost Basis by Origination Year 2017	1,007		1,198
Amortized Cost Basis by Origination Year, Prior to 2017	19,081		19,159
Revolving Loans	575,867		586,557
Revolving Loans Converted to Term	12,016		13,040
Portfolio loans, net of unearned income	634,018		646,387
Current-period gross write-offs	(174)	(443)
Current-period recoveries	79	172
Home Equity [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	4,724		18,191
Amortized Cost Basis by Origination Year 2020	15,055		3,611
Amortized Cost Basis by Origination Year 2019	3,290		3,334
Amortized Cost Basis by Origination Year 2018	2,959		975
Amortized Cost Basis by Origination Year 2017	857		1,110
Amortized Cost Basis by Origination Year, Prior to 2017	16,995		16,477
Revolving Loans	573,653		583,486
Revolving Loans Converted to Term	11,240		12,135
Portfolio loans, net of unearned income	628,773		639,319
Home Equity [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021			124
Amortized Cost Basis by Origination Year 2019			34
Amortized Cost Basis by Origination Year, Prior to 2017	400		882
Revolving Loans	783		1,247
Revolving Loans Converted to Term	30		127
Portfolio loans, net of unearned income	1,213		2,414
Home Equity [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year, Prior to 2017	121		14
Revolving Loans	76		749
Revolving Loans Converted to Term			12
Portfolio loans, net of unearned income	197		775
Home Equity [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2019			8
Amortized Cost Basis by Origination Year 2018	19		156
Amortized Cost Basis by Origination Year 2017	150		88
Amortized Cost Basis by Origination Year, Prior to 2017	1,565		1,786
Revolving Loans	1,355		1,075
Revolving Loans Converted to Term	746		766
Portfolio loans, net of unearned income	3,835		3,879
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, net of unearned income	5,712,742		5,705,392
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	66,997		385,541
Amortized Cost Basis by Origination Year 2020	392,577		243,253
Amortized Cost Basis by Origination Year 2019	209,613		150,912
Amortized Cost Basis by Origination Year 2018	131,570		109,384
Amortized Cost Basis by Origination Year 2017	95,111		171,971
Amortized Cost Basis by Origination Year, Prior to 2017	748,554		659,900
Portfolio loans, net of unearned income	1,644,422		1,720,961
Current-period gross write-offs	(371)	(386)
Current-period recoveries	135	272
Residential Real Estate [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	66,997		385,541
Amortized Cost Basis by Origination Year 2020	392,577		242,770
Amortized Cost Basis by Origination Year 2019	209,234		149,603
Amortized Cost Basis by Origination Year 2018	130,435		108,090
Amortized Cost Basis by Origination Year 2017	94,237		170,967
Amortized Cost Basis by Origination Year, Prior to 2017	731,848		641,665
Portfolio loans, net of unearned income	1,625,328		1,698,636
Residential Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2019			320
Amortized Cost Basis by Origination Year 2018	79		533
Amortized Cost Basis by Origination Year, Prior to 2017	2,634		1,761
Portfolio loans, net of unearned income	2,713		2,614
Residential Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2019			823
Amortized Cost Basis by Origination Year 2018	272
Amortized Cost Basis by Origination Year 2017	113		185
Amortized Cost Basis by Origination Year, Prior to 2017	1,204		4,646
Portfolio loans, net of unearned income	1,589		5,654
Residential Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2020			483
Amortized Cost Basis by Origination Year 2019	379		166
Amortized Cost Basis by Origination Year 2018	784		761
Amortized Cost Basis by Origination Year 2017	761		819
Amortized Cost Basis by Origination Year, Prior to 2017	12,868		11,828
Portfolio loans, net of unearned income	14,792		14,057
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	18,158		73,714
Amortized Cost Basis by Origination Year 2020	66,299		90,264
Amortized Cost Basis by Origination Year 2019	79,508		39,951
Amortized Cost Basis by Origination Year 2018	33,739		22,560
Amortized Cost Basis by Origination Year 2017	18,980		13,513
Amortized Cost Basis by Origination Year, Prior to 2017	51,938		46,609
Revolving Loans	20,607		22,279
Revolving Loans Converted to Term	166		165
Portfolio loans, net of unearned income	289,395		309,055
Current-period gross write-offs	(927)	(856)
Current-period recoveries	462	415
Consumer [Member] | Current [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	18,121		72,847
Amortized Cost Basis by Origination Year 2020	65,802		89,637
Amortized Cost Basis by Origination Year 2019	79,045		39,584
Amortized Cost Basis by Origination Year 2018	33,586		22,118
Amortized Cost Basis by Origination Year 2017	18,773		13,144
Amortized Cost Basis by Origination Year, Prior to 2017	51,313		45,735
Revolving Loans	20,589		22,253
Revolving Loans Converted to Term	166		165
Portfolio loans, net of unearned income	287,395		305,483
Consumer [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	37		481
Amortized Cost Basis by Origination Year 2020	444		408
Amortized Cost Basis by Origination Year 2019	413		210
Amortized Cost Basis by Origination Year 2018	68		311
Amortized Cost Basis by Origination Year 2017	114		194
Amortized Cost Basis by Origination Year, Prior to 2017	352		379
Revolving Loans			15
Portfolio loans, net of unearned income	1,428		1,998
Consumer [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021			273
Amortized Cost Basis by Origination Year 2020	45		147
Amortized Cost Basis by Origination Year 2019	50		84
Amortized Cost Basis by Origination Year 2018	31		100
Amortized Cost Basis by Origination Year 2017	64		163
Amortized Cost Basis by Origination Year, Prior to 2017	148		253
Revolving Loans	2		11
Portfolio loans, net of unearned income	340		1,031
Consumer [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021			113
Amortized Cost Basis by Origination Year 2020	8		72
Amortized Cost Basis by Origination Year 2019			73
Amortized Cost Basis by Origination Year 2018	54		31
Amortized Cost Basis by Origination Year 2017	29		12
Amortized Cost Basis by Origination Year, Prior to 2017	125		242
Revolving Loans	16
Portfolio loans, net of unearned income	232		543
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	30,840		134,179
Amortized Cost Basis by Origination Year 2020	165,814		314,614
Amortized Cost Basis by Origination Year 2019	296,600		111,167
Amortized Cost Basis by Origination Year 2018	49,862		27,774
Amortized Cost Basis by Origination Year 2017	27,332		16,774
Amortized Cost Basis by Origination Year, Prior to 2017	48,469		36,156
Revolving Loans	23,100		27,613
Portfolio loans, net of unearned income	642,017		668,277
Current-period gross write-offs	(18)	(1)
Current-period recoveries	55	8
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	30,840		133,720
Amortized Cost Basis by Origination Year 2020	164,939		314,614
Amortized Cost Basis by Origination Year 2019	296,600		109,232
Amortized Cost Basis by Origination Year 2018	49,749		27,483
Amortized Cost Basis by Origination Year 2017	27,064		16,404
Amortized Cost Basis by Origination Year, Prior to 2017	43,143		29,685
Revolving Loans	22,500		26,297
Portfolio loans, net of unearned income	634,835		657,435
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021			459
Amortized Cost Basis by Origination Year 2020	875
Amortized Cost Basis by Origination Year 2019			1,532
Amortized Cost Basis by Origination Year 2018	39		233
Amortized Cost Basis by Origination Year 2017	228		79
Amortized Cost Basis by Origination Year, Prior to 2017	3,618		3,778
Revolving Loans	600		1,316
Portfolio loans, net of unearned income	5,360		7,397
Commercial Real Estate - Land and Construction [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2019			403
Amortized Cost Basis by Origination Year 2018	74		58
Amortized Cost Basis by Origination Year 2017	40		291
Amortized Cost Basis by Origination Year, Prior to 2017	1,708		2,693
Portfolio loans, net of unearned income	1,822		3,445
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	156,789		812,311
Amortized Cost Basis by Origination Year 2020	789,410		754,181
Amortized Cost Basis by Origination Year 2019	772,808		668,368
Amortized Cost Basis by Origination Year 2018	659,248		545,520
Amortized Cost Basis by Origination Year 2017	533,548		633,477
Amortized Cost Basis by Origination Year, Prior to 2017	2,071,424		1,532,366
Revolving Loans	87,498		90,892
Portfolio loans, net of unearned income	5,070,725		5,037,115
Current-period gross write-offs	(19)	(1,398)
Current-period recoveries	528	293
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	156,789		809,516
Amortized Cost Basis by Origination Year 2020	787,296		670,554
Amortized Cost Basis by Origination Year 2019	690,398		646,629
Amortized Cost Basis by Origination Year 2018	639,915		474,622
Amortized Cost Basis by Origination Year 2017	472,801		572,733
Amortized Cost Basis by Origination Year, Prior to 2017	1,864,909		1,346,552
Revolving Loans	67,149		89,120
Portfolio loans, net of unearned income	4,679,257		4,609,726
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021			2,693
Amortized Cost Basis by Origination Year 2020	1,892		67,261
Amortized Cost Basis by Origination Year 2019	53,807		16,793
Amortized Cost Basis by Origination Year 2018	17,473		59,251
Amortized Cost Basis by Origination Year 2017	53,576		42,284
Amortized Cost Basis by Origination Year, Prior to 2017	150,704		130,247
Revolving Loans	20,349		1,772
Portfolio loans, net of unearned income	297,801		320,301
Commercial Real Estate - Improved Property [Member] | Commercial Real Estate [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021			102
Amortized Cost Basis by Origination Year 2020	222		16,366
Amortized Cost Basis by Origination Year 2019	28,603		4,946
Amortized Cost Basis by Origination Year 2018	1,860		11,647
Amortized Cost Basis by Origination Year 2017	7,171		18,460
Amortized Cost Basis by Origination Year, Prior to 2017	55,811		55,567
Portfolio loans, net of unearned income	93,667		107,088
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	402,334		977,538
Amortized Cost Basis by Origination Year 2020	688,922		246,805
Amortized Cost Basis by Origination Year 2019	237,586		199,865
Amortized Cost Basis by Origination Year 2018	191,388		167,490
Amortized Cost Basis by Origination Year 2017	142,074		87,306
Amortized Cost Basis by Origination Year, Prior to 2017	336,808		282,603
Revolving Loans	423,493		445,695
Revolving Loans Converted to Term	130		136
Portfolio loans, net of unearned income	2,422,735		2,407,438
Current-period gross write-offs	(750)	(2,714)
Current-period recoveries	440	$ 107
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	401,323		977,085
Amortized Cost Basis by Origination Year 2020	685,632		240,262
Amortized Cost Basis by Origination Year 2019	232,322		193,712
Amortized Cost Basis by Origination Year 2018	185,484		160,924
Amortized Cost Basis by Origination Year 2017	135,856		85,379
Amortized Cost Basis by Origination Year, Prior to 2017	320,788		265,890
Revolving Loans	404,023		427,336
Revolving Loans Converted to Term	130		136
Portfolio loans, net of unearned income	2,365,558		2,350,724
Commercial and Industrial [Member] | Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	26		453
Amortized Cost Basis by Origination Year 2020	3,290		2,726
Amortized Cost Basis by Origination Year 2019	2,746		4,206
Amortized Cost Basis by Origination Year 2018	4,236		2,795
Amortized Cost Basis by Origination Year 2017	2,651		324
Amortized Cost Basis by Origination Year, Prior to 2017	10,841		11,640
Revolving Loans	13,992		12,453
Portfolio loans, net of unearned income	37,782		34,597
Commercial and Industrial [Member] | Classified - substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Amortized Cost Basis by Origination Year 2021	985
Amortized Cost Basis by Origination Year 2020			3,817
Amortized Cost Basis by Origination Year 2019	2,518		1,947
Amortized Cost Basis by Origination Year 2018	1,668		3,771
Amortized Cost Basis by Origination Year 2017	3,567		1,603
Amortized Cost Basis by Origination Year, Prior to 2017	5,179		5,073
Revolving Loans	5,478		5,906
Portfolio loans, net of unearned income	$ 19,395		$ 22,117

Loans and the Allowance for _17

Loans and the Allowance for Credit Losses - Summary of Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Other real estate owned	$ 375	$ 504
Repossessed assets	18	45
Total other real estate owned and repossessed assets	$ 393	$ 549

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021USD ($)Derivative	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) on change in fair value	$ 6,263,000	$ (5,553,000)
Collateral posted with market value on liability positions with credit risk-related contingent features	$ 54,200,000
Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	122		112
Aggregate notional amount	$ 711,000,000		$ 649,900,000
Net gain (loss) on change in fair value	2,800,000	(2,800,000)
Income (loss) on derivative instrument not designated hedges	$ 1,900,000	2,600,000
Risk Participation in Agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	13		12
Aggregate notional amount	$ 119,200,000		$ 101,100,000
Risk Participation out Agreement [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	1		1
Aggregate notional amount	$ 10,000,000		$ 10,000,000
Other Contract [Member] | Forward TBA Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	197,000,000		$ 183,500,000
Net gain (loss) on change in fair value	$ 4,500,000	$ (2,700,000)

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 33,247,000	$ 47,120,000
Liability Derivatives	32,784,000	51,078,000
Interest Rate Swaps [Member] | Loan Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	710,986,000	649,857,000
Asset Derivatives	31,732,000	46,418,000
Liability Derivatives	32,470,000	49,917,000
Interest Rate Loan Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	85,435,000	112,119,000
Asset Derivatives		702,000
Liability Derivatives	314,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	197,000,000	183,500,000
Asset Derivatives	$ 1,515,000
Liability Derivatives		$ 1,161,000

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Summary of Effect of Derivative Instruments on Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	$ 6,263	$ (5,553)
Interest Rate Swaps [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	2,761	(2,751)
Interest Rate Loan Commitments [Member] | Mortgage Banking Income [Member]
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	(1,016)	(145)
Forward TBA Contracts [Member] | Mortgage Banking Income [Member]
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	$ 4,518	$ (2,657)

Benefit Plans - Defined Benefit

Benefit Plans - Defined Benefit Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Service cost – benefits earned during year	$ 616	$ 568
Interest cost on projected benefit obligation	842	1,121
Expected return on plan assets	(2,763)	(2,594)
Amortization of prior service cost	(8)	(9)
Amortization of net loss	675	793
Net periodic pension income	$ (638)	$ (121)

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Service cost	$ 616,000	$ 568,000
Periodic pension income	1,300,000	$ 700,000
Minimum required pension plan contribution	5,200,000
Available credit balance	64,200,000
Expected voluntary contribution for the year 2021	$ 0

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 13,123	$ 13,047
Available-for-sale debt securities	2,775,212	1,978,136
Loans held for sale	153,520	168,378
Other real estate owned and repossessed assets	393	549
Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	13,123	13,047
Available-for-sale debt securities	2,775,212	1,978,136
Loans held for sale	153,520	168,378
Other assets - interest rate derivatives agreements	31,732	46,418
Total assets	2,973,587	2,205,979
Other liabilities - interest rate derivatives agreements	32,470	49,917
Total liabilities recurring fair value measurements	32,470	49,917
Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually-evaluated nonperforming loans	1,909	1,958
Other real estate owned and repossessed assets	393	549
Total assets	2,302	2,507
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	29,997	39,982
US Treasury Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	29,997	39,982
U.S. Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	176,330	211,682
U.S. Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	176,330	211,682
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	2,140,793	1,264,737
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	2,140,793	1,264,737
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	291,681	320,098
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	291,681	320,098
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	111,798	115,762
Obligations of States and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	111,798	115,762
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	24,613	25,875
Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	24,613	25,875
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	13,123	13,047
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	13,123	13,047
Total assets	13,123	13,047
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	2,773,701	1,976,601
Loans held for sale	153,520	168,378
Other assets - interest rate derivatives agreements	31,732	46,418
Other liabilities - interest rate derivatives agreements	32,470	49,917
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	2,773,701	1,976,601
Loans held for sale	153,520	168,378
Other assets - interest rate derivatives agreements	31,732	46,418
Total assets	2,958,953	2,191,397
Other liabilities - interest rate derivatives agreements	32,470	49,917
Total liabilities recurring fair value measurements	32,470	49,917
Significant Other Observable Inputs (Level 2) [Member] | US Treasury Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	29,997	39,982
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	176,330	211,682
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	2,140,793	1,264,737
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	291,681	320,098
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	110,287	114,227
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	24,613	25,875
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,511	1,535
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,511	1,535
Total assets	1,511	1,535
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually-evaluated nonperforming loans	1,909	1,958
Other real estate owned and repossessed assets	393	549
Total assets	2,302	2,507
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 1,511	$ 1,535

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair value transfer amount	$ 0	$ 0

Fair Value Measurement - Sche_2

Fair Value Measurement - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Fair Value Inputs Asset Quantitative Information [Line Items]
Other real estate owned and repossessed assets	$ 393	$ 549
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Individually-evaluated nonperforming loans	1,909	1,958
Other real estate owned and repossessed assets	393	549
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Individually-evaluated nonperforming loans	1,909	1,958
Other real estate owned and repossessed assets	$ 393	$ 549
Individually-evaluated nonperforming loans, Appraisal adjustments	(30.00%)	(30.00%)
Individually-evaluated nonperforming loans, Liquidation expenses	(5.60%)	(5.60%)
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Individually-evaluated nonperforming loans, Appraisal adjustments	(30.00%)	(30.00%)
Individually-evaluated nonperforming loans, Liquidation expenses	(5.60%)	(5.60%)

Fair Value Measurement - Estima

Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Assets
Cash and due from banks	$ 759,048	$ 905,447
Equity securities	13,123	13,047
Available-for-sale debt securities	2,775,212	1,978,136
Held-to-maturity debt securities	813,740	731,212
Loans held for sale	153,520	168,378
Accrued interest receivable	68,896	66,790
Financial Liabilities
Deposits	13,286,999	12,429,373
Federal Home Loan Bank borrowings	433,984	549,003
Other borrowings	137,218	241,950
Subordinated debt and junior subordinated debt	192,430	192,291
Accrued interest payable	3,224	4,314
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets
Cash and due from banks	759,048	905,447
Equity securities	13,123	13,047
Accrued interest receivable	68,896	66,790
Financial Liabilities
Deposits	11,731,925	10,810,863
Other borrowings	125,925	235,796
Accrued interest payable	3,224	4,314
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets
Available-for-sale debt securities	2,773,701	1,976,601
Held-to-maturity debt securities	839,411	767,720
Loans held for sale	153,520	168,378
Other assets - interest rate derivatives	31,732	46,418
Financial Liabilities
Deposits	1,568,803	1,629,118
Federal Home Loan Bank borrowings	438,211	555,375
Subordinated debt and junior subordinated debt	105,371	105,768
Other liabilities - interest rate derivatives	32,470	49,917
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets
Available-for-sale debt securities	1,511	1,535
Held-to-maturity debt securities	461	463
Net loans	10,540,445	10,802,883
Financial Liabilities
Subordinated debt and junior subordinated debt	66,771	68,684
Carrying Amount [Member]
Financial Assets
Cash and due from banks	759,048	905,447
Equity securities	13,123	13,047
Available-for-sale debt securities	2,775,212	1,978,136
Held-to-maturity debt securities	813,450	730,886
Net loans	10,543,272	10,603,406
Loans held for sale	153,520	168,378
Other assets - interest rate derivatives	31,732	46,418
Accrued interest receivable	68,896	66,790
Financial Liabilities
Deposits	13,286,999	12,429,373
Federal Home Loan Bank borrowings	433,984	549,003
Other borrowings	137,218	241,950
Subordinated debt and junior subordinated debt	192,430	192,291
Other liabilities - interest rate derivatives	32,470	49,917
Accrued interest payable	3,224	4,314
Fair Value Estimate [Member]
Financial Assets
Cash and due from banks	759,048	905,447
Equity securities	13,123	13,047
Available-for-sale debt securities	2,775,212	1,978,136
Held-to-maturity debt securities	839,872	768,183
Net loans	10,540,445	10,802,883
Loans held for sale	153,520	168,378
Other assets - interest rate derivatives	31,732	46,418
Accrued interest receivable	68,896	66,790
Financial Liabilities
Deposits	13,300,728	12,439,981
Federal Home Loan Bank borrowings	438,211	555,375
Other borrowings	125,925	235,796
Subordinated debt and junior subordinated debt	172,142	174,452
Other liabilities - interest rate derivatives	32,470	49,917
Accrued interest payable	$ 3,224	$ 4,314

Revenue Recognition - Summary o

Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 1,524	$ 1,679
Debit card sponsorship income	646	708
Electronic banking fees	4,365	4,254
Mortgage banking income	4,264	1,276
Net gain on other real estate owned and other assets	175	169
Total Service Charges on Deposits [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	4,894	6,617
Trust Account fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 5,313	4,857
Point of revenue recognition	Over time
WesMark Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 2,318	2,095
Point of revenue recognition	Over time
Total Trust Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 7,631	6,952
Commercial Banking Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 564	585
Point of revenue recognition	Over time
Personal Service Charges [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 4,330	6,032
Point of revenue recognition	At a point in time and over time
Annuity Commissions [Member]
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 917	1,038
Point of revenue recognition	At a point in time
Equity And Debt Security Trades [Member]
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 76	159
Point of revenue recognition	At a point in time
Managed Money [Member]
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 283	235
Point of revenue recognition	Over time
Trail Commissions [Member]
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 248	247
Point of revenue recognition	Over time
Payment Processing Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Payment Processing Fees	$ 713	$ 680
Point of revenue recognition	At a point in time and over time
Debit Card Sponsorship Income [Member]
Schedule Of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time and over time
Electronic Banking Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time
Mortgage [Member]
Schedule Of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time
Other Real Estate Owned and Other Assets [Member]
Schedule Of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time

Comprehensive Income_(Loss) - C

Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,756,737	$ 2,593,921
Amounts reclassified from accumulated other comprehensive income/(loss)	470	(1,176)
Total other comprehensive gain (loss)	(21,556)	39,940
Ending Balance	2,785,522	2,586,060
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(15,502)	(17,468)
Amounts reclassified from accumulated other comprehensive income/(loss)	472	569
Total other comprehensive gain (loss)	472	569
Ending Balance	(15,030)	(16,899)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	46,861	18,644
Other comprehensive income/(loss) before reclassifications	(22,026)	41,116
Amounts reclassified from accumulated other comprehensive income/(loss)	(2)	(1,743)
Total other comprehensive gain (loss)	(22,028)	39,373
Ending Balance	24,833	58,017
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		25
Amounts reclassified from accumulated other comprehensive income/(loss)		(2)
Total other comprehensive gain (loss)		(2)
Ending Balance		23
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	31,359	1,201
Other comprehensive income/(loss) before reclassifications	(22,026)	41,116
Amounts reclassified from accumulated other comprehensive income/(loss)	470	(1,176)
Total other comprehensive gain (loss)	(21,556)	39,940
Ending Balance	$ 9,803	$ 41,141

Comprehensive Income_(Loss) -_2

Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Percentage of Federal and State income tax rate	24.00%	24.00%

Comprehensive Income_(Loss) - S

Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	$ (279)	$ (1,491)
Provision for income taxes	18,202	3,621
Employee benefits (Non-interest expense)	10,266	10,373
Interest and dividends on securities (Interest and dividend income)	(15,037)	(21,442)
Net effect on accumulated other comprehensive income/(loss) for the period	470	(1,176)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	(2)	(1,743)
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	472	569
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period		(2)
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	(3)	(2,287)
Provision for income taxes	1	544
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	(150)	(177)
Employee benefits (Non-interest expense)	$ 622	746
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes		1
Interest and dividends on securities (Interest and dividend income)		$ (3)

Comprehensive Income_(Loss) -_3

Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Percentage of Federal and State income tax rate	24.00%	24.00%

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Allowance for credit losses associated with loan commitments	$ 6.7	$ 9.5
Liability associated with letters of credit	$ 0.1	$ 0.2

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Lines of credit	$ 2,497,734	$ 2,510,011
Loans approved but not closed	470,736	381,180
Overdraft limits	153,374	154,322
Letters of credit	53,136	53,788
Contingent obligations and other guarantees	$ 199,066	$ 126,984

Business Segments - Additional

Business Segments - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)Segment	Mar. 31, 2020USD ($)
Segment Reporting Information [Line Items]
Operating segments | Segment	2
Trust and Investment Services [Member]
Segment Reporting Information [Line Items]
Market value of assets managed or held in custody by trust and investment services segment	$ 5,200	$ 4,100
Total non-fiduciary assets of the trust and investment services segment	3.9	3.8
Trust and Investment Services [Member] | Customer-Related Intangible Assets [Member]
Segment Reporting Information [Line Items]
Total non-fiduciary assets of the trust and investment services segment	$ 1.7	$ 2.2

Business Segments - Financial I

Business Segments - Financial Information by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Interest and dividend income	$ 125,054	$ 142,448
Interest expense	8,576	22,286
Net interest income	116,478	120,162
Provision for credit losses	(27,958)	29,821
Net interest income after provision for credit losses	144,436	90,341
Non-interest income	33,208	28,009
Non-interest expense	86,327	91,333
Income before provision for income taxes	91,317	27,017
Provision for income taxes	18,202	3,621
Net income	73,115	23,396
Preferred stock dividends	2,531
Net income available to common shareholders	70,584	23,396
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest and dividend income	125,054	142,448
Interest expense	8,576	22,286
Net interest income	116,478	120,162
Provision for credit losses	(27,958)	29,821
Net interest income after provision for credit losses	144,436	90,341
Non-interest income	25,577	21,057
Non-interest expense	82,011	86,918
Income before provision for income taxes	88,002	24,480
Provision for income taxes	17,506	3,088
Net income	70,496
Preferred stock dividends	2,531
Net income available to common shareholders	67,965	21,392
Trust and Investment Services [Member]
Segment Reporting Information [Line Items]
Non-interest income	7,631	6,952
Non-interest expense	4,316	4,415
Income before provision for income taxes	3,315	2,537
Provision for income taxes	696	533
Net income	2,619
Net income available to common shareholders	$ 2,619	$ 2,004