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Loans - Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Loans:
Loans - Gross	$ 2,659,727		$ 2,562,545
Less: Net deferred loan fees and costs	(1,452)		(1,750)
Loans after net deferred loan fees and costs	2,658,275		2,560,795
Less: Allowance for credit losses	(27,475)	$ (26,977)	(25,826)	$ (25,484)	$ (25,270)	$ (25,024)
Plus: Basis adjustment related to fair value hedges	1,868		1,074
Loans - Net	2,632,668		2,536,043
Consumer Real Estate [Member]
Loans:
Loans - Gross	522,416		520,114
Less: Allowance for credit losses	(4,129)	(3,653)	(3,543)	(3,363)	(3,201)	(3,581)
Agricultural Real Estate [Member]
Loans:
Loans - Gross	222,145		216,401
Less: Allowance for credit losses	(756)	(738)	(895)	(937)	(926)	(312)
Agricultural [Member]
Loans:
Loans - Gross	179,361		152,080
Less: Allowance for credit losses	(416)	(334)	(285)	(261)	(285)	(336)
Commercial Real Estate [Member]
Loans:
Loans - Gross	1,355,166		1,310,811
Less: Allowance for credit losses	(16,901)	(17,354)	(16,560)	(16,455)	(16,319)	(17,400)
Commercial and Industrial [Member]
Loans:
Loans - Gross	296,084		275,152
Consumer [Member]
Loans:
Loans - Gross	60,469		63,009
Less: Allowance for credit losses	(969)	$ (945)	(1,012)	$ (1,086)	$ (1,172)	$ (1,302)
Other Loan [Member]
Loans:
Loans - Gross	$ 24,086		$ 24,978

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