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Borrowings - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Line Of Credit Facility [Line Items]    
Advances from FHLB collateralized by certain loans $ 309,900,000 $ 115,400,000
Investment in FHLB stock 1,300,000 278,000
Line of credit amount outstanding 16,000,000 8,000,000
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 $ 53,800,000  
Line of credit amount outstanding 0  
Line of credit facility, secured loans 99,500,000  
Revolving Credit Facility | First National Bankers Bank    
Line Of Credit Facility [Line Items]    
Line of credit amount outstanding $ 5,000,000  
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 89,100,000 78,700,000
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