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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) - USD ($) $ in Thousands	Jun. 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	$ 341,601	$ 354,420
Distribution of variable rate loans by major loan category, Variable Rate	165,265	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	142,029	144,702
Distribution of variable rate loans by major loan category, Variable Rate	88,808	76,117
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	58,445	52,867
Distribution of variable rate loans by major loan category, Variable Rate	69,899	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	993,941	941,927
Distribution of variable rate loans by major loan category, Variable Rate	286,961	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	148,425	130,513
Distribution of variable rate loans by major loan category, Variable Rate	105,019	111,847
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	88,247	88,972
Distribution of variable rate loans by major loan category, Variable Rate	65	175
Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	19,300	20,029
Distribution of variable rate loans by major loan category, Variable Rate	$ 9,696	$ 9,789