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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) $ in Thousands	Mar. 31, 2020 USD ($)
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 116,954
Distribution of variable rate loans by major loan category, Variable Rate	57,777
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	93,095
Distribution of variable rate loans by major loan category, Variable Rate	101,288
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	105,065
Distribution of variable rate loans by major loan category, Variable Rate	4,519
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	419,430
Distribution of variable rate loans by major loan category, Variable Rate	150,787
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	126,434
Distribution of variable rate loans by major loan category, Variable Rate	16,827
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	45,055
Distribution of variable rate loans by major loan category, Variable Rate	3,967
Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	8,277
Distribution of variable rate loans by major loan category, Variable Rate	$ 59