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Loans (Tier Risk Rating System) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Nonaccrual [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on nonaccrual loans $ 22 $ 61  
Nonaccrual [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Combined increase in nonaccrual loans due to two borrower relationships     $ 3,700
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Repayment period of loan with a reasonable reduction of principal balance 2 years