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Loans - Loan Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,043,946		$ 2,861,728
Allowance for credit losses	(41,268)	$ (39,919)	(37,160)	$ (35,280)	$ (35,149)	$ (28,511)
Net loans	3,002,678		2,824,568
Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,043,946		2,861,728
Allowance for credit losses	(41,268)		(37,160)
Net loans	3,002,678		2,824,568
Commercial and Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	304,639		304,793
Allowance for credit losses	(5,079)	(5,348)	(7,587)	(5,156)	(5,540)	(3,011)
Commercial and Agriculture [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	304,639		304,793
Commercial Real Estate Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	375,751		377,321
Allowance for credit losses	(4,365)	(4,328)	(4,723)	(5,481)	(5,531)	(4,565)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	375,751		377,321
Commercial Real Estate Non Owner Occupied [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,205,453		1,161,894
Allowance for credit losses	(14,547)	(14,421)	(12,056)	(11,555)	(11,646)	(14,138)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,205,453		1,161,894
Residential Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	751,825		659,841
Allowance for credit losses	(10,722)	(9,416)	(8,489)	(6,831)	(6,515)	(3,145)
Residential Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	751,825		659,841
Real Estate Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	318,063		260,409
Allowance for credit losses	(3,716)	(3,647)	(3,388)	(3,739)	(3,447)	(2,293)
Real Estate Construction [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	318,063		260,409
Farm Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,122		24,771
Allowance for credit losses	(221)	(261)	(260)	(227)	(243)	$ (291)
Farm Real Estate [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	24,122		24,771
Lease Financing Receivable [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	49,453		54,642
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	14,640		18,057
Allowance for credit losses	(255)	$ (268)	(341)	$ (248)	$ (272)
Consumer and Other [Member] | Loans Receivable [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 14,640		$ 18,057

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