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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Consumer Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate $ 320,801 $ 329,142
Distribution of variable rate loans by major loan category, Variable Rate 205,101 192,753
Agricultural Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate 123,645 123,783
Distribution of variable rate loans by major loan category, Variable Rate 98,913 100,008
Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate 51,483 56,269
Distribution of variable rate loans by major loan category, Variable Rate 91,426 76,291
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate 970,298 1,024,989
Distribution of variable rate loans by major loan category, Variable Rate 333,300 312,777
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate 134,074 131,385
Distribution of variable rate loans by major loan category, Variable Rate 134,352 123,550
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate 70,889 79,526
Distribution of variable rate loans by major loan category, Variable Rate 29 65
Other Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Distribution of fixed rate loans by major loan category, Fixed Rate 16,967 20,552
Distribution of variable rate loans by major loan category, Variable Rate $ 9,482 $ 9,584