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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 331,050	$ 329,142
Distribution of variable rate loans by major loan category, Variable Rate	194,128	192,753
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	132,725	123,783
Distribution of variable rate loans by major loan category, Variable Rate	94,730	100,008
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	52,536	56,269
Distribution of variable rate loans by major loan category, Variable Rate	75,134	76,291
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	989,520	1,024,989
Distribution of variable rate loans by major loan category, Variable Rate	314,880	312,777
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	133,140	131,385
Distribution of variable rate loans by major loan category, Variable Rate	122,911	123,550
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	74,757	79,526
Distribution of variable rate loans by major loan category, Variable Rate	62	65
Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	17,294	20,552
Distribution of variable rate loans by major loan category, Variable Rate	$ 9,482	$ 9,584