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Loans (Tier Risk Rating System) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Nonaccrual [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest income on nonaccrual loans $ 33 $ 28 $ 85 $ 69
Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Repayment period of loan with a reasonable reduction of principal balance     2 years