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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 350,541	$ 354,420
Distribution of variable rate loans by major loan category, Variable Rate	152,433	140,003
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	144,890	144,702
Distribution of variable rate loans by major loan category, Variable Rate	83,007	76,117
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	52,394	52,867
Distribution of variable rate loans by major loan category, Variable Rate	79,073	75,866
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	970,161	941,927
Distribution of variable rate loans by major loan category, Variable Rate	255,154	210,676
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	136,702	130,513
Distribution of variable rate loans by major loan category, Variable Rate	104,896	111,847
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	89,520	88,972
Distribution of variable rate loans by major loan category, Variable Rate	68	175
Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	19,620	20,029
Distribution of variable rate loans by major loan category, Variable Rate	$ 9,696	$ 9,789