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Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	$ 3,267	$ 2,961	$ 10,408	$ 9,010
Digital banking income	7,476	7,324	21,485	20,053
Net swap fee and valuation income	4,857	3,231	9,054	4,937
Mortgage banking income	123	1,898	2,096	5,402
Net gains on other real estate owned and other assets	194	329	2,776	400
Total Service Charges on Deposits [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	12,263	11,163	34,769	30,233
Trust Account fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	7,411	6,955	$ 23,390	21,327
Point of revenue recognition			Over time
WesMark Fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	2,255	2,032	$ 6,548	6,015
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	9,666	8,987	$ 29,938	27,342
Commercial Banking Fees [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	2,785	2,463	$ 8,146	6,846
Point of revenue recognition			Over time
Personal Service Charges [Member]
Disaggregation of Revenue [Line Items]
Total trust fees/Total service charges on deposits	9,478	8,700	$ 26,623	23,387
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	2,095	2,237	$ 6,745	6,834
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	143	73	$ 497	282
Point of revenue recognition			At a point in time
Managed Money [Member]
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	641	366	$ 1,947	1,030
Point of revenue recognition			Over time
Trail Commissions [Member]
Disaggregation of Revenue [Line Items]
Total net securities brokerage revenue	388	285	$ 1,219	864
Point of revenue recognition			Over time
Payment Processing Fees [Member]
Disaggregation of Revenue [Line Items]
Payment processing fees	$ 889	$ 844	$ 2,536	$ 2,539
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