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Loans (Impaired Loans) - Additional Information (Detail)
1 Months Ended 3 Months Ended
May 31, 2020
Loan
Mar. 31, 2021
USD ($)
Contract
Loan
Mar. 31, 2020
USD ($)
Contract
Loan
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Additional funds available to be advanced in connection with impaired loans   $ 150,000    
Impaired loans classified as troubled debt restructured   $ 5,800,000 $ 1,900,000 $ 6,500,000
Number of contracts modified | Loan   0    
TDR impaired loans paid off | Loan 1 0 0  
TDR loans, subsequently defaulted during the period   0 0  
TDR impaired loans charged off | Loan     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    
Delinquent period for charging down commercial and agricultural credits   120 days    
Foreclosed residential real estate property   $ 148,000   71,000
Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Litigation and any deficiency charged off period   150 days    
Commercial and Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
TDR impaired loans paid off | Loan   3    
TDR impaired loans charged off amount   $ 809,000    
Consumer Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of contracts modified | Contract     2  
Foreclosed residential real estate property   148,000 $ 50,000 71,000
Residential real estate properties foreclosure proceedings   $ 796,000 $ 292,000 $ 910,000
Principal Forgiveness [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of contracts modified | Contract   0    
Payment Changes from Monthly Payment to Principal and Interest at Maturity [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of contracts modified | Contract     2  
Loan maturity date   Jun. 19, 2020