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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of the allowance for loan losses        
Balance at beginning of period $ 10,947 $ 10,262 $ 10,852 $ 9,886
Additions:        
Provision for loan losses 450 330 750 680
Deductions:        
Loans charged off 269 156 548 268
Less recoveries on loans (84) (109) (158) (247)
Net loan charge-offs (recoveries) 185 47 390 21
Balance at end of period 11,212 10,545 11,212 10,545
Commercial Financial And Agricultural        
Summary of the allowance for loan losses        
Balance at beginning of period 3,261 2,360 3,325 2,753
Additions:        
Provision for loan losses 865 226 898 (157)
Deductions:        
Loans charged off 193 32 303 60
Less recoveries on loans (10) (24) (23) (42)
Net loan charge-offs (recoveries) 183 8 280 18
Balance at end of period 3,943 2,578 3,943 2,578
Residential Real Estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 240 99 170 108
Additions:        
Provision for loan losses (52) (54) 54 (113)
Deductions:        
Loans charged off 0 0 48 0
Less recoveries on loans (13) (25) (25) (75)
Net loan charge-offs (recoveries) (13) (25) 23 (75)
Balance at end of period 201 70 201 70
Residential Real Estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 2,057 2,125 1,689 2,385
Additions:        
Provision for loan losses 48 (230) 416 (507)
Deductions:        
Loans charged off 12 62 32 81
Less recoveries on loans (16) (21) (36) (57)
Net loan charge-offs (recoveries) (4) 41 (4) 24
Balance at end of period 2,109 1,854 2,109 1,854
Commercial Real Estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 895 579 807 413
Additions:        
Provision for loan losses 10 36 128 202
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 905 615 905 615
Commercial Real Estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 4,008 4,731 4,437 3,793
Additions:        
Provision for loan losses (388) 139 (809) 1,084
Deductions:        
Loans charged off 15 2 29 16
Less recoveries on loans (25) (14) (31) (21)
Net loan charge-offs (recoveries) (10) (12) (2) (5)
Balance at end of period 3,630 4,882 3,630 4,882
Installment and Other Consumer        
Summary of the allowance for loan losses        
Balance at beginning of period 352 322 345 274
Additions:        
Provision for loan losses 90 89 131 161
Deductions:        
Loans charged off 49 60 106 111
Less recoveries on loans (20) (25) (43) (52)
Net loan charge-offs (recoveries) 29 35 63 59
Balance at end of period 413 376 413 376
Unallocated        
Summary of the allowance for loan losses        
Balance at beginning of period 134 46 79 160
Additions:        
Provision for loan losses (123) 124 (68) 10
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 $ 11 $ 170 $ 11 $ 170