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Loans (Impaired Loans) - Additional Information (Detail)
 12 Months Ended
Jul. 30, 2021
Dec. 31, 2024
USD ($)
Contract
Dec. 31, 2023
USD ($)
Loan
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired loans classified as modifications to borrowers experiencing financial difficulty         $ 3,600,000
Number of contracts modified | Loan     1    
Increase to loan balance     $ 411,000    
Term of loan 5 years        
Modifications to borrower experiencing financial difficulty   $ 0 0    
Maximum time for re-evaluation (in months)   12 months      
Re-evaluation period for real estate   2 years      
Unsecured consumer loans, credit card credits and overdraft lines of credit reach   90 days      
Delinquent period for charging down consumer loans   90 days      
Litigation and any deficiency charged off period   150 days      
Delinquent period for charging down/allocated commercial and agricultural credits   120 days      
ASU 2016-13 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses and unfunded commitment liability       $ 4,500,000  
Allowance for redit losses and unfunded commitment liability, net of tax       $ 3,400,000  
Consumer Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Foreclosed residential real estate property   $ 0 0    
Residential real estate properties foreclosure proceedings   $ 890,000 $ 679,000    
Principal Forgiveness [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of contracts modified | Contract   0