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Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of the allowance for loan losses                        
Balance at beginning of period       $ 12,477       $ 11,652   $ 12,477 $ 11,652 $ 10,852
Additions:                        
Provision for loan losses $ 400 $ 1,200 $ 900 3,300 $ 300 $ 450 $ 250 150   5,800 1,150 1,475
Deductions:                        
Loans charged off                   509 793 1,041
Less recoveries on loans                   (345) (468) (366)
Net loan charge-offs (recoveries)                   164 325 675
Balance at end of period 18,113       12,477         18,113 12,477 11,652
Amount of PPP loans funded during the period   88,400 $ 88,400                  
Percentage credit guarantee from the SBA for the PPP loans                 100.00%      
Allowance for PPP loans   $ 0             $ 0      
SBA PPA loans, net 65,100                 65,100    
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       2,918       3,237   2,918 3,237 3,325
Additions:                        
Provision for loan losses                   2,241 (168) 296
Deductions:                        
Loans charged off                   207 295 484
Less recoveries on loans                   (169) (144) (100)
Net loan charge-offs (recoveries)                   38 151 384
Balance at end of period 5,121       2,918         5,121 2,918 3,237
SBA PPA loans, net 63,300                 63,300    
Residential real estate | Construction                        
Summary of the allowance for loan losses                        
Balance at beginning of period       64       140   64 140 170
Additions:                        
Provision for loan losses                   85 (126) (44)
Deductions:                        
Loans charged off                       48
Less recoveries on loans                   (64) (50) (62)
Net loan charge-offs (recoveries)                   (64) (50) (14)
Balance at end of period 213       64         213 64 140
Residential real estate | Mortgages                        
Summary of the allowance for loan losses                        
Balance at beginning of period       2,118       2,071   2,118 2,071 1,689
Additions:                        
Provision for loan losses                   568 195 516
Deductions:                        
Loans charged off                   52 277 186
Less recoveries on loans                   (45) (129) (52)
Net loan charge-offs (recoveries)                   7 148 134
Balance at end of period 2,679       2,118         2,679 2,118 2,071
Commercial real estate | Construction                        
Summary of the allowance for loan losses                        
Balance at beginning of period       369       757   369 757 807
Additions:                        
Provision for loan losses                   106 (388) (20)
Deductions:                        
Loans charged off                       30
Net loan charge-offs (recoveries)                       30
Balance at end of period 475       369         475 369 757
Commercial real estate | Mortgages                        
Summary of the allowance for loan losses                        
Balance at beginning of period       6,547       4,914   6,547 4,914 4,437
Additions:                        
Provision for loan losses                   2,838 1,618 457
Deductions:                        
Loans charged off                   39 25 38
Less recoveries on loans                   (8) (40) (58)
Net loan charge-offs (recoveries)                   31 (15) (20)
Balance at end of period 9,354       6,547         9,354 6,547 4,914
Installment and other consumer                        
Summary of the allowance for loan losses                        
Balance at beginning of period       381       334   381 334 345
Additions:                        
Provision for loan losses                   35 138 150
Deductions:                        
Loans charged off                   211 196 255
Less recoveries on loans                   (59) (105) (94)
Net loan charge-offs (recoveries)                   152 91 161
Balance at end of period 264       381         264 381 334
Unallocated                        
Summary of the allowance for loan losses                        
Balance at beginning of period       $ 80       $ 199   80 199 79
Additions:                        
Provision for loan losses                   (73) (119) 120
Deductions:                        
Balance at end of period $ 7       $ 80         $ 7 $ 80 $ 199