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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) - USD ($) $ in Thousands	Sep. 30, 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	$ 330,689	$ 354,420
Distribution of variable rate loans by major loan category, Variable Rate	182,284	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	128,681	144,702
Distribution of variable rate loans by major loan category, Variable Rate	96,991	76,117
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	57,301	52,867
Distribution of variable rate loans by major loan category, Variable Rate	66,434	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	1,013,000	941,927
Distribution of variable rate loans by major loan category, Variable Rate	291,118	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	141,010	130,513
Distribution of variable rate loans by major loan category, Variable Rate	109,881	111,847
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	82,956	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	21,499	20,029
Distribution of variable rate loans by major loan category, Variable Rate	$ 9,584	$ 9,789