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Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Summary of the allowance for loan losses          
Balance at beginning of period $ 18,735 $ 16,622 $ 18,113 $ 12,477  
Additions:          
Provision for loan losses 300 1,200 700 5,400  
Deductions:          
Loans charged off 156 101 345 352  
Less recoveries on loans (50) (43) (461) (239)  
Net loan charge-offs (recoveries) 106 58 (116) 113  
Balance at end of period 18,929 17,764 18,929 17,764  
Amount of PPP loans funded during the period     $ 47,500 88,400  
Percentage credit guarantee from the SBA for the PPP loans     100.00%    
Allowance for PPP loans 0   $ 0    
SBA PPP loans, net 26,000   $ 26,000    
Paycheck Protection Program Loans, Interest Rate     1.00%    
Minimum          
Deductions:          
Expected repayment term of the SBA PPP loans     6 months    
Maximum          
Deductions:          
Expected repayment term of the SBA PPP loans     6 months    
Commercial, financial, and agricultural          
Summary of the allowance for loan losses          
Balance at beginning of period 5,336 3,614 $ 5,121 2,918  
Additions:          
Provision for loan losses (609) 178 (522) 867  
Deductions:          
Loans charged off 45 46 100 130  
Less recoveries on loans (19) (11) (202) (102)  
Net loan charge-offs (recoveries) 26 35 (102) 28  
Balance at end of period 4,701 3,757 4,701 3,757  
SBA PPP loans, net 26,000   26,000   $ 63,300
Residential real estate | Construction          
Summary of the allowance for loan losses          
Balance at beginning of period 251 171 213 64  
Additions:          
Provision for loan losses (16) 49 9 125  
Deductions:          
Less recoveries on loans   (13) (13) (44)  
Net loan charge-offs (recoveries)   (13) (13) (44)  
Balance at end of period 235 233 235 233  
Residential real estate | Mortgages          
Summary of the allowance for loan losses          
Balance at beginning of period 2,467 2,711 2,679 2,118  
Additions:          
Provision for loan losses 216 577 (167) 1,186  
Deductions:          
Loans charged off 18   22 52  
Less recoveries on loans (8) (4) (183) (40)  
Net loan charge-offs (recoveries) 10 (4) (161) 12  
Balance at end of period 2,673 3,292 2,673 3,292  
Commercial real estate | Construction          
Summary of the allowance for loan losses          
Balance at beginning of period 495 722 475 369  
Additions:          
Provision for loan losses (70) 100 (50) 453  
Deductions:          
Balance at end of period 425 822 425 822  
Commercial real estate | Mortgages          
Summary of the allowance for loan losses          
Balance at beginning of period 9,915 9,048 9,354 6,547  
Additions:          
Provision for loan losses 780 218 1,368 2,740  
Deductions:          
Loans charged off 15 13 42 37  
Less recoveries on loans (1)   (1) (3)  
Net loan charge-offs (recoveries) 14 13 41 34  
Balance at end of period 10,681 9,253 10,681 9,253  
Installment and other consumer          
Summary of the allowance for loan losses          
Balance at beginning of period 252 306 264 381  
Additions:          
Provision for loan losses 59 58 110 39  
Deductions:          
Loans charged off 78 42 181 133  
Less recoveries on loans (22) (15) (62) (50)  
Net loan charge-offs (recoveries) 56 27 119 83  
Balance at end of period 255 337 255 337  
Unallocated          
Summary of the allowance for loan losses          
Balance at beginning of period 19 50 7 80  
Additions:          
Provision for loan losses (60) 20 (48) (10)  
Deductions:          
Balance at end of period $ (41) $ 70 $ (41) $ 70