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Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Summary of the allowance for loan losses      
Balance at beginning of period $ 18,113 $ 12,477  
Additions:      
Provision for loan losses 0 3,300  
Deductions:      
Loans charged off 107 134  
Less recoveries on loans (355) (50)  
Net loan charge-offs (recoveries) (248) 84  
Balance at end of period 18,361 15,693  
Amount of PPP loans funded during the period $ 40,200 88,400  
Percentage credit guarantee from the SBA for the PPP loans 100.00%    
Allowance for PPP loans $ 0    
SBA PPA loans, net $ 56,300    
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 12 months    
Commercial, financial, and agricultural      
Summary of the allowance for loan losses      
Balance at beginning of period $ 5,121 2,918  
Additions:      
Provision for loan losses (567) 721  
Deductions:      
Loans charged off 27 41  
Less recoveries on loans (149) (25)  
Net loan charge-offs (recoveries) (122) 16  
Balance at end of period 4,676 3,623  
SBA PPA loans, net 56,300   $ 63,300
Residential real estate | Construction      
Summary of the allowance for loan losses      
Balance at beginning of period 213 64  
Additions:      
Provision for loan losses 83 53  
Deductions:      
Less recoveries on loans (13)    
Net loan charge-offs (recoveries) (13)    
Balance at end of period 309 117  
Residential real estate | Mortgages      
Summary of the allowance for loan losses      
Balance at beginning of period 2,679 2,118  
Additions:      
Provision for loan losses (253) 255  
Deductions:      
Loans charged off   19  
Less recoveries on loans (168) (9)  
Net loan charge-offs (recoveries) (168) 10  
Balance at end of period 2,594 2,363  
Commercial real estate | Construction      
Summary of the allowance for loan losses      
Balance at beginning of period 475 369  
Additions:      
Provision for loan losses 57 253  
Deductions:      
Balance at end of period 532 622  
Commercial real estate | Mortgages      
Summary of the allowance for loan losses      
Balance at beginning of period 9,354 6,547  
Additions:      
Provision for loan losses 573 2,087  
Deductions:      
Loans charged off 23 22  
Less recoveries on loans   (2)  
Net loan charge-offs (recoveries) 23 20  
Balance at end of period 9,904 8,614  
Installment and other consumer      
Summary of the allowance for loan losses      
Balance at beginning of period 264 381  
Additions:      
Provision for loan losses 13 8  
Deductions:      
Loans charged off 57 52  
Less recoveries on loans (25) (14)  
Net loan charge-offs (recoveries) 32 38  
Balance at end of period 245 351  
Unallocated      
Summary of the allowance for loan losses      
Balance at beginning of period 7 80  
Additions:      
Provision for loan losses 94 (77)  
Deductions:      
Balance at end of period $ 101 $ 3