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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Schedule Of Revenue Recognition [Line Items] |  |
Total net securities brokerage revenue | $ 2,701 | $ 2,548
Digital banking income | 5,404 | 4,704
Net swap fee and valuation income | 961 | 1,563
Mortgage banking income | 1,140 | 693
Net gain on other real estate owned and other assets | (40) | 154
Total Service Charges on Deposits [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total trust fees/Total service charges on deposits | 8,587 | 6,784
Trust Account fees [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total trust fees/Total service charges on deposits | $ 6,673 | 6,099
Point of revenue recognition | Over time |
WesMark Fees [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total trust fees/Total service charges on deposits | $ 2,024 | 1,983
Point of revenue recognition | Over time |
Total Trust Fees [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total trust fees/Total service charges on deposits | $ 8,697 | 8,082
Commercial Banking Fees [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total trust fees/Total service charges on deposits | $ 1,937 | 1,188
Point of revenue recognition | Over time |
Personal Service Charges [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total trust fees/Total service charges on deposits | $ 6,650 | 5,596
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 | $ 1,987 | 1,972
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 | $ 124 | 80
Point of revenue recognition | At a point in time |
Managed Money [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total net securities brokerage revenue | $ 327 | 254
Point of revenue recognition | Over time |
Trail Commissions [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Total net securities brokerage revenue | $ 262 | 242
Point of revenue recognition | Over time |
Payment Processing Fees [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Payment processing fees | $ 891 | $ 829
Point of revenue recognition | At a point in time and over time |
Digital Banking Income [Member] |  |
Schedule Of Revenue Recognition [Line Items] |  |
Point of revenue recognition | At a point in time |
Net Swap Fee And Valuation (Loss) Income [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 and over time |

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