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Loans - Loan Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,151,124		$ 3,081,230
Allowance for credit losses	(40,455)	$ (40,284)	(39,669)	$ (39,919)	$ (38,849)	$ (37,160)
Net loans	3,110,669		3,041,561
Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,151,124		3,081,230
Allowance for credit losses	(40,455)		(39,669)
Net loans	3,110,669		3,041,561
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	338,598		328,488
Allowance for credit losses	(6,057)	(6,194)	(6,586)	(5,348)	(7,737)	(7,587)
Commercial and Agriculture [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	338,598		328,488
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	378,248		374,367
Allowance for credit losses	(4,612)	(4,466)	(4,327)	(4,328)	(4,652)	(4,723)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	378,248		374,367
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,263,612		1,225,991
Allowance for credit losses	(11,321)	(11,412)	(11,404)	(14,421)	(12,968)	(12,056)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,263,612		1,225,991
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	815,408		763,869
Allowance for credit losses	(13,075)	(12,455)	(11,866)	(9,416)	(9,074)	(8,489)
Residential Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	815,408		763,869
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	277,643		305,992
Allowance for credit losses	(3,695)	(4,017)	(3,708)	(3,647)	(3,433)	(3,388)
Real Estate Construction [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	277,643		305,992
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	23,866		23,035
Allowance for credit losses	(305)	(264)	(226)	(261)	(320)	(260)
Farm Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	23,866		23,035
Lease Financing Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	42,758		46,900
Allowance for credit losses	(1,214)	(1,277)	(1,361)	(2,210)	(359)	(297)
Lease Financing Receivable [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	42,758		46,900
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	10,991		12,588
Allowance for credit losses	(176)	$ (199)	(191)	$ (268)	$ (306)	$ (341)
Consumer and Other [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 10,991		$ 12,588

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