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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Summary of the allowance for loan losses    
Balance at beginning of period $ 9,886 $ 8,604
Additions:    
Provision for loan losses 350 250
Deductions:    
Loans charged off 113 448
Less recoveries on loans (139) (225)
Net loan charge-offs (recoveries) (26) 223
Balance at end of period 10,262 8,631
Commercial, financial, and agricultural    
Summary of the allowance for loan losses    
Balance at beginning of period 2,753 2,153
Additions:    
Provision for loan losses (384) (12)
Deductions:    
Loans charged off 28 103
Less recoveries on loans (19) (97)
Net loan charge-offs (recoveries) 9 6
Balance at end of period 2,360 2,135
Residential real estate | Construction    
Summary of the allowance for loan losses    
Balance at beginning of period 108 59
Additions:    
Provision for loan losses (59) (15)
Deductions:    
Loans charged off 0 0
Less recoveries on loans (50) 0
Net loan charge-offs (recoveries) (50) 0
Balance at end of period 99 44
Residential real estate | Mortgage    
Summary of the allowance for loan losses    
Balance at beginning of period 2,385 2,439
Additions:    
Provision for loan losses (276) 32
Deductions:    
Loans charged off 20 206
Less recoveries on loans (36) (8)
Net loan charge-offs (recoveries) (16) 198
Balance at end of period 2,125 2,273
Commercial real estate | Construction    
Summary of the allowance for loan losses    
Balance at beginning of period 413 644
Additions:    
Provision for loan losses 166 33
Deductions:    
Loans charged off 0 1
Less recoveries on loans 0 (11)
Net loan charge-offs (recoveries) 0 (10)
Balance at end of period 579 687
Commercial real estate | Mortgage    
Summary of the allowance for loan losses    
Balance at beginning of period 3,793 2,935
Additions:    
Provision for loan losses 945 276
Deductions:    
Loans charged off 14 82
Less recoveries on loans (7) (61)
Net loan charge-offs (recoveries) 7 21
Balance at end of period 4,731 3,190
Installment Loans to Individuals    
Summary of the allowance for loan losses    
Balance at beginning of period 274 273
Additions:    
Provision for loan losses 72 (6)
Deductions:    
Loans charged off 51 56
Less recoveries on loans (27) (48)
Net loan charge-offs (recoveries) 24 8
Balance at end of period 322 259
Unallocated    
Summary of the allowance for loan losses    
Balance at beginning of period 160 101
Additions:    
Provision for loan losses (114) (58)
Deductions:    
Loans charged off 0 0
Less recoveries on loans 0 0
Net loan charge-offs (recoveries) 0 0
Balance at end of period $ 46 $ 43