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Borrowings - Additional Information (Details)
 12 Months Ended
Jan. 10, 2020
Advance
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Line Of Credit Facility [Line Items]      
Number of federal home loan bank advances acquired | Advance 3    
Advances from FHLB collateralized by certain loans   $ 343,600,000 $ 309,900,000
Investment in FHLB stock   2,200,000 1,300,000
Line of credit amount outstanding   8,000,000.0 16,000,000.0
Payroll protection program loans     100,813,000
Small Business Administration      
Line Of Credit Facility [Line Items]      
Secured payroll protection program loans     101,700,000
Federal Reserve Bank of Atlanta | Small Business Administration      
Line Of Credit Facility [Line Items]      
Payroll protection program loans   $ 100,800,000  
Payroll protection program loans, fixed interest rate   0.35%  
Federal Reserve Bank of Atlanta | Small Business Administration | Minimum      
Line Of Credit Facility [Line Items]      
Payroll protection program loans, maturity period   2 years  
Federal Reserve Bank of Atlanta | Small Business Administration | Maximum      
Line Of Credit Facility [Line Items]      
Payroll protection program loans, maturity period   5 years  
Federal Reserve Bank of Atlanta Discount Window      
Line Of Credit Facility [Line Items]      
Line of credit   $ 62,000,000.0 53,800,000
Line of credit amount outstanding   0 0
Line of credit facility, secured loans   $ 115,200,000 99,500,000
Revolving Credit Facility | First National Bankers Bank      
Line Of Credit Facility [Line Items]      
Line of credit amount outstanding     5,000,000.0
Line of credit, term   10 years  
Line of credit, frequency of payment and payment terms   Interest payments were due quarterly and the initial principal payment was due June 29, 2021  
Line of credit, initial principal payment due date   Jun. 29, 2021  
Line of credit, prepayment penalty   $ 0  
FHLB      
Line Of Credit Facility [Line Items]      
Line of credit   44,700,000 89,100,000
Unsecured Federal Funds      
Line Of Credit Facility [Line Items]      
Line of credit   12,500,000 12,500,000
Line of credit amount outstanding   $ 0 $ 0