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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summary of the allowance for loan losses        
Balance at beginning of period $ 11,212 $ 10,545 $ 10,852 $ 9,886
Additions:        
Provision for loan losses 250 555 1,000 1,235
Deductions:        
Loans charged off 186 165 735 433
Less recoveries on loans (82) (65) (241) (312)
Net loan charge-offs (recoveries) 104 100 494 121
Balance at end of period 11,358 11,000 11,358 11,000
Commercial Financial And Agricultural        
Summary of the allowance for loan losses        
Balance at beginning of period 3,943 2,578 3,325 2,753
Additions:        
Provision for loan losses (420) 853 478 695
Deductions:        
Loans charged off 75 37 378 97
Less recoveries on loans (38) (12) (61) (55)
Net loan charge-offs (recoveries) 37 25 317 42
Balance at end of period 3,486 3,406 3,486 3,406
Residential Real Estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 201 70 170 108
Additions:        
Provision for loan losses 26 64 80 (49)
Deductions:        
Loans charged off 0 0 48 0
Less recoveries on loans (13) (12) (38) (87)
Net loan charge-offs (recoveries) (13) (12) 10 (87)
Balance at end of period 240 146 240 146
Residential Real Estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 2,109 1,854 1,689 2,385
Additions:        
Provision for loan losses 255 100 672 (407)
Deductions:        
Loans charged off 32 68 64 149
Less recoveries on loans (9) (11) (44) (68)
Net loan charge-offs (recoveries) 23 57 20 81
Balance at end of period 2,341 1,897 2,341 1,897
Commercial Real Estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 905 615 807 413
Additions:        
Provision for loan losses (159) 91 (31) 293
Deductions:        
Loans charged off 0 0 30 0
Less recoveries on loans 0 0 0 0
Net loan charge-offs (recoveries) 0 0 30 0
Balance at end of period 746 706 746 706
Commercial Real Estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 3,630 4,882 4,437 3,793
Additions:        
Provision for loan losses 444 (426) (366) 658
Deductions:        
Loans charged off 5 4 34 20
Less recoveries on loans (2) (5) (34) (26)
Net loan charge-offs (recoveries) 3 (1) 0 (6)
Balance at end of period 4,071 4,457 4,071 4,457
Installment and Other Consumer        
Summary of the allowance for loan losses        
Balance at beginning of period 413 376 345 274
Additions:        
Provision for loan losses 39 32 170 194
Deductions:        
Loans charged off 74 56 181 167
Less recoveries on loans (20) (25) (64) (76)
Net loan charge-offs (recoveries) 54 31 117 91
Balance at end of period 398 377 398 377
Unallocated        
Summary of the allowance for loan losses        
Balance at beginning of period 11 170 79 160
Additions:        
Provision for loan losses 65 (159) (3) (149)
Deductions:        
Loans charged off 0 0 0 0
Less recoveries on loans 0 0 0 0
Net loan charge-offs (recoveries) 0 0 0 0
Balance at end of period $ 76 $ 11 $ 76 $ 11