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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 7,282
Distribution of variable rate loans by major loan category, Variable Rate	102
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	66,857
Distribution of variable rate loans by major loan category, Variable Rate	94,323
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	86,756
Distribution of variable rate loans by major loan category, Variable Rate	106,147
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	41,061
Distribution of variable rate loans by major loan category, Variable Rate	73,859
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	272,827
Distribution of variable rate loans by major loan category, Variable Rate	168,373
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	54,861
Distribution of variable rate loans by major loan category, Variable Rate	83,075
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	42,487
Distribution of variable rate loans by major loan category, Variable Rate	$ 5,086