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Loans - Loan Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,095,994		$ 3,081,230
Allowance for credit losses	(40,254)	$ (40,455)	(39,669)	$ (41,268)	$ (39,919)	$ (37,160)
Net loans	3,055,740		3,041,561
Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,095,994		3,081,230
Allowance for credit losses	(40,254)		(39,669)
Net loans	3,055,740		3,041,561
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	302,407		328,488
Allowance for credit losses	(6,378)	(6,057)	(6,586)	(5,079)	(5,348)	(7,587)
Commercial and Agriculture [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	302,407		328,488
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	384,176		374,367
Allowance for credit losses	(4,686)	(4,612)	(4,327)	(4,365)	(4,328)	(4,723)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	384,176		374,367
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,216,031		1,225,991
Allowance for credit losses	(10,132)	(11,321)	(11,404)	(14,547)	(14,421)	(12,056)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,216,031		1,225,991
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	842,362		763,869
Allowance for credit losses	(13,986)	(13,075)	(11,866)	(10,722)	(9,416)	(8,489)
Residential Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	842,362		763,869
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	278,163		305,992
Allowance for credit losses	(3,554)	(3,695)	(3,708)	(3,716)	(3,647)	(3,388)
Real Estate Construction [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	278,163		305,992
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	23,713		23,035
Allowance for credit losses	(301)	(305)	(226)	(221)	(261)	(260)
Farm Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	23,713		23,035
Lease Financing Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	38,960		46,900
Allowance for credit losses	(1,066)	(1,214)	(1,361)	(2,361)	(2,210)	(297)
Lease Financing Receivable [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	38,960		46,900
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	10,182		12,588
Allowance for credit losses	(151)	$ (176)	(191)	$ (255)	$ (268)	$ (341)
Consumer and Other [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 10,182		$ 12,588

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