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Loans and Allowance for Loan Losses (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Summary of the allowance for loan losses        
Balance at beginning of period $ 9,392 $ 9,986 $ 8,604 $ 9,099
Additions:        
Provision for loan losses 300 0 975 250
Deductions:        
Loans charged off 362 884 1,116 1,444
Less recoveries on loans (140) (144) (1,007) (1,341)
Net loans charged off 222 740 109 103
Balance at end of period 9,470 9,246 9,470 9,246
Commercial, financial, and agricultural        
Summary of the allowance for loan losses        
Balance at beginning of period 2,996 3,124 2,153 1,779
Additions:        
Provision for loan losses (94) 439 710 1,319
Deductions:        
Loans charged off 157 591 295 741
Less recoveries on loans (26) (28) (203) (643)
Net loans charged off 131 563 92 98
Balance at end of period 2,771 3,000 2,771 3,000
Residential real estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 63 17 59 171
Additions:        
Provision for loan losses (4) (27) 0 (475)
Deductions:        
Loans charged off 0 0 0 0
Less recoveries on loans 0 (28) 0 (322)
Net loans charged off 0 (28) 0 (322)
Balance at end of period 59 18 59 18
Residential real estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 2,293 2,332 2,439 2,527
Additions:        
Provision for loan losses (152) (233) 66 (277)
Deductions:        
Loans charged off 92 87 474 298
Less recoveries on loans (31) (45) (49) (105)
Net loans charged off 61 42 425 193
Balance at end of period 2,080 2,057 2,080 2,057
Commercial real estate | Construction        
Summary of the allowance for loan losses        
Balance at beginning of period 249 414 644 466
Additions:        
Provision for loan losses 44 137 (852) 90
Deductions:        
Loans charged off 0 0 1 5
Less recoveries on loans 0 0 (502) 0
Net loans charged off 0 0 (501) 5
Balance at end of period 293 551 293 551
Commercial real estate | Mortgage        
Summary of the allowance for loan losses        
Balance at beginning of period 3,411 3,870 2,935 3,846
Additions:        
Provision for loan losses 450 (503) 944 (598)
Deductions:        
Loans charged off 27 126 137 159
Less recoveries on loans (36) (5) (128) (157)
Net loans charged off (9) 121 9 2
Balance at end of period 3,870 3,246 3,870 3,246
Installment Loans to Individuals        
Summary of the allowance for loan losses        
Balance at beginning of period 284 185 273 270
Additions:        
Provision for loan losses 50 66 106 66
Deductions:        
Loans charged off 86 80 209 241
Less recoveries on loans (47) (38) (125) (114)
Net loans charged off 39 42 84 127
Balance at end of period 295 209 295 209
Unallocated        
Summary of the allowance for loan losses        
Balance at beginning of period 96 44 101 40
Additions:        
Provision for loan losses 6 121 1 125
Deductions:        
Loans charged off 0 0 0 0
Less recoveries on loans 0 0 0 0
Net loans charged off 0 0 0 0
Balance at end of period $ 102 $ 165 $ 102 $ 165