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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	$ 3,670	$ 3,348	$ 7,142	$ 6,049
Digital banking income	7,410	7,325	14,008	12,730
Net swap fee and valuation income	3,135	746	4,197	1,706
Mortgage banking income	1,055	2,364	1,974	3,504
Net gain (loss) on other real estate owned and other assets	2,036	111	2,583	71
Total Service Charges on Deposits [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	11,546	10,484	22,507	19,070
Trust Account fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	7,640	7,698	$ 15,982	14,372
Point of revenue recognition			Over time
WesMark Fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	2,190	1,959	$ 4,290	3,983
Point of revenue recognition			Over time
Net Swap Fee and Valuation Income [Member]
Disaggregation of Revenue [Line Items]
Point of revenue recognition			At a point in time
Total Trust Fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	9,830	9,657	$ 20,272	18,355
Commercial Banking Fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	2,744	2,446	$ 5,361	4,383
Point of revenue recognition			Over time
Personal Service Charges [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	8,802	8,038	$ 17,146	14,687
Point of revenue recognition			At a point in time and over time
Annuity Commissions [Member]
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	2,354	2,610	$ 4,651	4,598
Point of revenue recognition			At a point in time
Equity And Debt Security Trades [Member]
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	194	84	$ 354	208
Point of revenue recognition			At a point in time
Managed Money [Member]
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	673	337	$ 1,306	664
Point of revenue recognition			Over time
Trail Commissions [Member]
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	449	317	$ 831	579
Point of revenue recognition			Over time
Payment Processing Fees [Member]
Disaggregation of Revenue [Line Items]
Payment processing fees	$ 776	$ 804	$ 1,647	$ 1,696
Point of revenue recognition			At a point in time and over time
Digital Banking Income [Member]
Disaggregation of Revenue [Line Items]
Point of revenue recognition			At a point in time
Mortgage [Member]
Disaggregation of Revenue [Line Items]
Point of revenue recognition			At a point in time
Other Real Estate Owned and Other Assets [Member]
Disaggregation of Revenue [Line Items]
Point of revenue recognition			At a point in time and over time