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Loans - Loan Balances (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,014,996		$ 2,861,728
Allowance for credit losses	(39,919)	$ (38,849)	(37,160)	$ (35,149)	$ (34,196)	$ (28,511)
Net loans	2,975,077		2,824,568
Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,014,996		2,861,728
Allowance for credit losses	(39,919)		(37,160)
Net loans	2,975,077		2,824,568
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	318,499		304,793
Allowance for credit losses	(5,348)	(7,737)	(7,587)	(5,540)	(3,316)	(3,011)
Commercial and Agriculture [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	318,499		304,793
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	377,308		377,321
Allowance for credit losses	(4,328)	(4,652)	(4,723)	(5,531)	(5,733)	(4,565)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	377,308		377,321
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,213,341		1,161,894
Allowance for credit losses	(14,421)	(12,968)	(12,056)	(11,646)	(11,760)	(14,138)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,213,341		1,161,894
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	729,213		659,841
Allowance for credit losses	(9,416)	(9,074)	(8,489)	(6,515)	(5,934)	(3,145)
Residential Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	729,213		659,841
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	283,446		260,409
Allowance for credit losses	(3,647)	(3,433)	(3,388)	(3,447)	(3,920)	(2,293)
Real Estate Construction [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	283,446		260,409
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,376		24,771
Allowance for credit losses	(261)	(320)	(260)	(243)	(269)	$ (291)
Farm Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,376		24,771
Lease Financing Receivable [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	53,461		54,642
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	15,352		18,057
Allowance for credit losses	(268)	$ (306)	(341)	$ (272)	$ (354)
Consumer and Other [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 15,352		$ 18,057

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