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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 2,961	$ 2,659	$ 9,010	$ 7,808
Digital banking income	7,324	5,084	20,053	14,828
Net swap fee and valuation income	3,231	(627)	4,937	2,712
Mortgage banking income	1,898	1,280	5,402	3,042
Net gain (loss) on other real estate owned and other assets	329	(239)	400	(51)
Total Service Charges on Deposits [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	11,163	7,945	30,233	21,841
Trust Account fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	6,955	5,467	$ 21,327	16,854
Point of revenue recognition			Over time
WesMark Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	2,032	2,050	$ 6,015	6,048
Point of revenue recognition			Over time
Total Trust Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	8,987	7,517	$ 27,342	22,902
Commercial Banking Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	2,463	1,358	$ 6,846	3,844
Point of revenue recognition			Over time
Personal Service Charges [Member]
Schedule Of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	8,700	6,587	$ 23,387	17,997
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	2,237	2,008	$ 6,834	5,958
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	73	81	$ 282	231
Point of revenue recognition			At a point in time
Managed Money [Member]
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	366	298	$ 1,030	824
Point of revenue recognition			Over time
Trail Commissions [Member]
Schedule Of Revenue Recognition [Line Items]
Total net securities brokerage revenue	285	272	$ 864	795
Point of revenue recognition			Over time
Payment Processing Fees [Member]
Schedule Of Revenue Recognition [Line Items]
Payment processing fees	$ 844	$ 925	$ 2,539	$ 2,659
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

X

- Definition

Amount of commission revenue from buying and selling securities on behalf of customers.

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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.

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- Definition

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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.

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