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Loans and Allowance for Loan Losses - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]      
Deferred loan fees $ 885,226   $ 899,096
Debt securities, held-to-maturity, 90 days or more past due, still accruing 0   0
Loan restructuring trial modifications, amount 0 $ 0  
Small Business Administration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Debt instrument, Collateral fee $ 0 227,000  
Small Business Administration [Member] | Minimum [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Percentage of guarantee made to eligible borrowers under PPP loans 1.00%    
Small Business Administration [Member] | Maximum [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Percentage of guarantee made to eligible borrowers under PPP loans 5.00%    
Paycheck Protection Program [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Debt instrument interest rate, stated percentage 1.00%    
Percentage of guarantee made to eligible borrowers under PPP loans 100.00%    
Paycheck Protection Program [Member] | Minimum [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Debt instrument, term 2 years    
Paycheck Protection Program [Member] | Maximum [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Debt instrument, term 5 years    
Paycheck Protection Program [Member] | Small Business Administration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Debt instrument, Collateral fee $ 7,200 $ 205,000  
Deferred loan fees $ 55,000   $ 62,000