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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Revenue Recognition [Line Items] |  |  |
Total net securities brokerage revenue | $ 9,525 | $ 6,896 | $ 6,189
Debit card sponsorship income | 0 | 646 | 2,792
Electronic banking fees | 20,002 | 19,318 | 17,524
Mortgage banking income | 5,129 | 19,528 | 22,736
Net gains on other real estate owned and other assets | 482 | 4,816 | 103
Total Service Charges on Deposits [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total trust fees/Total service charges on deposits | 26,281 | 22,412 | 21,943
Trust Account fees [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total trust fees/Total service charges on deposits | $ 19,134 | 19,717 | 17,753
Point of revenue recognition | Over time |  |
WesMark Fees [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total trust fees/Total service charges on deposits | $ 8,417 | 9,794 | 8,582
Point of revenue recognition | Over time |  |
Total Trust Fees [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total trust fees/Total service charges on deposits | $ 27,551 | 29,511 | 26,335
Commercial Banking Fees [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total trust fees/Total service charges on deposits | $ 2,372 | 2,088 | 2,337
Point of revenue recognition | Over time |  |
Personal Service Charges [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total trust fees/Total service charges on deposits | $ 23,909 | 20,324 | 19,606
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 | $ 7,258 | 4,331 | 3,906
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 | $ 87 | 242 | 349
Point of revenue recognition | At a point in time |  |
Managed Money [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total net securities brokerage revenue | $ 1,215 | 1,201 | 952
Point of revenue recognition | Over time |  |
Trail Commissions [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Total net securities brokerage revenue | $ 965 | 1,122 | 982
Point of revenue recognition | Over time |  |
Payment Processing Fees [Member] |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |
Payment Processing Fees | $ 3,352 | $ 3,100 | $ 3,010
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 |  |

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned and other assets, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned and other assets after acquisition or physical possession. + References No definition available. + Details
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