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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 66,403
Distribution of variable rate loans by major loan category, Variable Rate	93,137
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	89,487
Distribution of variable rate loans by major loan category, Variable Rate	104,281
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	60,789
Distribution of variable rate loans by major loan category, Variable Rate	52,966
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	270,572
Distribution of variable rate loans by major loan category, Variable Rate	172,685
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	63,473
Distribution of variable rate loans by major loan category, Variable Rate	62,136
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	44,346
Distribution of variable rate loans by major loan category, Variable Rate	4,606
Other Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	7,242
Distribution of variable rate loans by major loan category, Variable Rate	$ 99