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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summary of the allowance for loan losses    
Balance at beginning of period $ 10,852 $ 9,886
Additions:    
Provision for loan losses 300 350
Deductions:    
Loans charged off 279 113
Less recoveries on loans (74) (139)
Net loan charge-offs (recoveries) 205 (26)
Balance at end of period 10,947 10,262
Commercial Financial And Agricultural    
Summary of the allowance for loan losses    
Balance at beginning of period 3,325 2,753
Additions:    
Provision for loan losses 33 (384)
Deductions:    
Loans charged off 110 28
Less recoveries on loans (13) (19)
Net loan charge-offs (recoveries) 97 9
Balance at end of period 3,261 2,360
Residential Real Estate | Construction    
Summary of the allowance for loan losses    
Balance at beginning of period 170 108
Additions:    
Provision for loan losses 106 (59)
Deductions:    
Loans charged off 48 0
Less recoveries on loans (12) (50)
Net loan charge-offs (recoveries) 36 (50)
Balance at end of period 240 99
Residential Real Estate | Mortgage    
Summary of the allowance for loan losses    
Balance at beginning of period 1,689 2,385
Additions:    
Provision for loan losses 369 (276)
Deductions:    
Loans charged off 20 20
Less recoveries on loans (19) (36)
Net loan charge-offs (recoveries) 1 (16)
Balance at end of period 2,057 2,125
Commercial Real Estate | Construction    
Summary of the allowance for loan losses    
Balance at beginning of period 807 413
Additions:    
Provision for loan losses 118 166
Deductions:    
Loans charged off 30 0
Less recoveries on loans 0 0
Net loan charge-offs (recoveries) 30 0
Balance at end of period 895 579
Commercial Real Estate | Mortgage    
Summary of the allowance for loan losses    
Balance at beginning of period 4,437 3,793
Additions:    
Provision for loan losses (421) 945
Deductions:    
Loans charged off 14 14
Less recoveries on loans (6) (7)
Net loan charge-offs (recoveries) 8 7
Balance at end of period 4,008 4,731
Installment and Other Consumer    
Summary of the allowance for loan losses    
Balance at beginning of period 345 274
Additions:    
Provision for loan losses 40 72
Deductions:    
Loans charged off 57 51
Less recoveries on loans (24) (27)
Net loan charge-offs (recoveries) 33 24
Balance at end of period 352 322
Unallocated    
Summary of the allowance for loan losses    
Balance at beginning of period 79 160
Additions:    
Provision for loan losses 55 (114)
Deductions:    
Loans charged off 0 0
Less recoveries on loans 0 0
Net loan charge-offs (recoveries) 0 0
Balance at end of period $ 134 $ 46