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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Summary of the allowance for loan losses        
Balance at beginning of period $ 10,262 $ 8,631 $ 9,886 $ 8,604
Additions:        
Provision for loan losses 330 425 680 675
Deductions:        
Loans charged off 156 306 268 754
Less recoveries on loans (109) (642) (247) (867)
Net loan charge-offs (recoveries) 47 (336) 21 (113)
Balance at end of period 10,545 9,392 10,545 9,392
Commercial, financial, and agricultural        
Summary of the allowance for loan losses        
Balance at beginning of period 2,360 2,135 2,753 2,153
Additions:        
Provision for loan losses 226 817 (157) 804
Deductions:        
Loans charged off 32 36 60 138
Less recoveries on loans (24) (80) (42) (177)
Net loan charge-offs (recoveries) 8 (44) 18 (39)
Balance at end of period 2,578 2,996 2,578 2,996
Residential real estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 99 44 108 59
Additions:        
Provision for loan losses (54) 19 113 4
Deductions:        
Loans charged off 0 0 0 0
Less recoveries on loans (25) 0 (75) 0
Net loan charge-offs (recoveries) (25) 0 (75) 0
Balance at end of period 70 63 70 63
Residential real estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 2,125 2,273 2,385 2,439
Additions:        
Provision for loan losses (230) 186 (507) 218
Deductions:        
Loans charged off 62 175 81 381
Less recoveries on loans (21) (9) (57) (17)
Net loan charge-offs (recoveries) 41 166 24 364
Balance at end of period 1,854 2,293 1,854 2,293
Commercial real estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 579 687 413 644
Additions:        
Provision for loan losses 36 (929) 202 (896)
Deductions:        
Loans charged off 0 0 0 1
Less recoveries on loans 0 (491) 0 (502)
Net loan charge-offs (recoveries) 0 (491) 0 (501)
Balance at end of period 615 249 615 249
Commercial real estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 4,731 3,190 3,793 2,935
Additions:        
Provision for loan losses 139 218 1,084 495
Deductions:        
Loans charged off 2 28 16 111
Less recoveries on loans (14) (31) (21) (92)
Net loan charge-offs (recoveries) (12) (3) (5) 19
Balance at end of period 4,882 3,411 4,882 3,411
Installment Loans to Individuals        
Summary of the allowance for loan losses        
Balance at beginning of period 322 259 274 273
Additions:        
Provision for loan losses 89 61 161 55
Deductions:        
Loans charged off 60 67 111 123
Less recoveries on loans (25) (31) (52) (79)
Net loan charge-offs (recoveries) 35 36 59 44
Balance at end of period 376 284 376 284
Unallocated        
Summary of the allowance for loan losses        
Balance at beginning of period 46 43 160 101
Additions:        
Provision for loan losses 124 53 10 (5)
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 $ 170 $ 96 $ 170 $ 96