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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Revenue Recognition [Line Items]      
Total net securities brokerage revenue $ 6,896 $ 6,189 $ 6,990
Debit card sponsorship income 646 2,792 328
Electronic banking fees 19,318 17,524 22,634
Mortgage banking income 19,528 22,736 8,219
Net gains on other real estate owned and other assets 4,816 103 732
Total Service Charges on Deposits [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total trust fees/Total service charges on deposits 22,412 21,943 26,974
Trust Account fees [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total trust fees/Total service charges on deposits $ 19,717 17,753 18,059
Point of revenue recognition Over time    
WesMark Fees [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total trust fees/Total service charges on deposits $ 9,794 8,582 8,520
Point of revenue recognition Over time    
Total Trust Fees [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total trust fees/Total service charges on deposits $ 29,511 26,335 26,579
Commercial Banking Fees [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total trust fees/Total service charges on deposits $ 2,088 2,337 2,033
Point of revenue recognition Over time    
Personal Service Charges [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total trust fees/Total service charges on deposits $ 20,324 19,606 24,941
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 $ 4,331 3,906 4,829
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 $ 242 349 434
Point of revenue recognition At a point in time    
Managed Money [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total net securities brokerage revenue $ 1,201 952 738
Point of revenue recognition Over time    
Trail Commissions [Member]      
Schedule Of Revenue Recognition [Line Items]      
Total net securities brokerage revenue $ 1,122 982 989
Point of revenue recognition Over time    
Payment Processing Fees [Member]      
Schedule Of Revenue Recognition [Line Items]      
Payment Processing Fees $ 3,100 $ 3,010 $ 3,002
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