Loans - Loan Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,081,230	$ 2,861,727
Allowance for credit losses	(39,669)	(37,160)	$ (28,511)	$ (26,641)
Net loans	3,041,561	2,824,568
Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,081,230	2,861,727
Allowance for credit losses	(39,669)	(37,160)
Net loans	3,041,561	2,824,567
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	328,488	304,793
Allowance for credit losses	(6,586)	(7,587)	(3,011)	(2,600)
Commercial and Agriculture [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	328,488	304,793
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	374,367	377,321
Allowance for credit losses	(4,327)	(4,723)	(4,565)	(4,464)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	374,367	377,321
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,225,991	1,161,894
Allowance for credit losses	(11,404)	(12,056)	(14,138)	(13,860)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,225,991	1,161,894
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	763,869	659,841
Allowance for credit losses	(11,866)	(8,489)	(3,145)	(2,597)
Residential Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	763,869	659,841
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	305,992	260,409
Allowance for credit losses	(3,708)	(3,388)	(2,293)	(1,810)
Real Estate Construction [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	305,992	260,409
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	23,035	24,771
Allowance for credit losses	(226)	(260)	(291)	(287)
Farm Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	23,035	24,771
Lease Financing Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	46,900	54,642
Allowance for credit losses	(1,361)	(297)	(429)
Lease Financing Receivable [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	46,900	54,642
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	12,588	18,056
Allowance for credit losses	(191)	(341)	$ (98)	$ (176)
Consumer and Other [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 12,588	$ 18,056