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Loans - Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loans:
Loans - Gross	$ 2,536,837		$ 2,580,674
Less: Net deferred loan fees and costs	1,499		517
Loans after net deferred loan fees and costs	2,538,336		2,581,191
Less: Allowance for credit losses	(25,484)	$ (25,270)	(25,024)	$ (25,277)	$ (24,910)	$ (20,313)
Loans - Net	2,512,852		2,556,167
Consumer Real Estate [Member]
Loans:
Loans - Gross	524,055		521,895
Less: Allowance for credit losses	(3,363)	(3,201)	(3,581)	(3,842)	(3,998)	(998)
Agricultural Real Estate [Member]
Loans:
Loans - Gross	220,328		223,791
Less: Allowance for credit losses	(937)	(926)	(312)	(315)	(237)	(349)
Agricultural [Member]
Loans:
Loans - Gross	137,252		132,560
Less: Allowance for credit losses	(261)	(285)	(336)	(185)	(107)	(751)
Commercial Real Estate [Member]
Loans:
Loans - Gross	1,301,160		1,337,766
Less: Allowance for credit losses	(16,455)	(16,319)	(17,400)	(16,805)	(16,681)	(11,924)
Commercial and Industrial [Member]
Loans:
Loans - Gross	260,732		254,935
Consumer [Member]
Loans:
Loans - Gross	67,394		79,591
Less: Allowance for credit losses	(1,086)	$ (1,172)	(1,302)	$ (1,422)	$ (1,120)	$ (909)
Other Loan [Member]
Loans:
Loans - Gross	$ 25,916		$ 30,136

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