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Loans and Allowance for Loan Losses (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of the allowance for loan losses                      
Balance at beginning of period       $ 9,886       $ 8,604 $ 9,886 $ 8,604 $ 9,099
Additions:                      
Provision for loan losses $ 530 $ 555 $ 330 350 $ 450 $ 300 $ 425 250 1,765 1,425 250
Deductions:                      
Loans charged off                 1,181 1,290 2,190
Less recoveries on loans                 (382) (1,147) (1,445)
Net loans charged off                 799 143 745
Balance at end of period 10,852       9,886       10,852 9,886 8,604
Commercial, financial, and agricultural                      
Summary of the allowance for loan losses                      
Balance at beginning of period       2,753       2,153 2,753 2,153 1,779
Additions:                      
Provision for loan losses                 1,147 690 833
Deductions:                      
Loans charged off                 649 389 1,131
Less recoveries on loans                 (74) (299) (672)
Net loans charged off                 575 90 459
Balance at end of period 3,325       2,753       3,325 2,753 2,153
Residential real estate | Construction                      
Summary of the allowance for loan losses                      
Balance at beginning of period       108       59 108 59 171
Additions:                      
Provision for loan losses                 (26) 49 (434)
Deductions:                      
Loans charged off                 0 0 0
Less recoveries on loans                 (88) 0 (322)
Net loans charged off                 (88) 0 (322)
Balance at end of period 170       108       170 108 59
Residential real estate | Mortgages                      
Summary of the allowance for loan losses                      
Balance at beginning of period       2,385       2,439 2,385 2,439 2,527
Additions:                      
Provision for loan losses                 (560) 381 153
Deductions:                      
Loans charged off                 219 495 379
Less recoveries on loans                 (83) (60) (138)
Net loans charged off                 136 435 241
Balance at end of period 1,689       2,385       1,689 2,385 2,439
Commercial real estate | Construction                      
Summary of the allowance for loan losses                      
Balance at beginning of period       413       644 413 644 466
Additions:                      
Provision for loan losses                 394 (732) 193
Deductions:                      
Loans charged off                 0 1 15
Less recoveries on loans                 0 (502) 0
Net loans charged off                 0 (501) 15
Balance at end of period 807       413       807 413 644
Commercial real estate | Mortgages                      
Summary of the allowance for loan losses                      
Balance at beginning of period       3,793       2,935 3,793 2,935 3,846
Additions:                      
Provision for loan losses                 657 865 (713)
Deductions:                      
Loans charged off                 45 147 363
Less recoveries on loans                 (32) (140) (165)
Net loans charged off                 13 7 198
Balance at end of period 4,437       3,793       4,437 3,793 2,935
Installment and other consumer                      
Summary of the allowance for loan losses                      
Balance at beginning of period       274       273 274 273 270
Additions:                      
Provision for loan losses                 234 113 157
Deductions:                      
Loans charged off                 268 258 302
Less recoveries on loans                 (105) (146) (148)
Net loans charged off                 163 112 154
Balance at end of period 345       274       345 274 273
Unallocated                      
Summary of the allowance for loan losses                      
Balance at beginning of period       $ 160       $ 101 160 101 40
Additions:                      
Provision for loan losses                 (81) 59 61
Deductions:                      
Loans charged off                 0 0 0
Less recoveries on loans                 0 0 0
Net loans charged off                 0 0 0
Balance at end of period $ 79       $ 160       $ 79 $ 160 $ 101