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Loans and Allowance for Loan Losses (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of the allowance for loan losses                      
Balance at beginning of period       $ 8,604       $ 9,099 $ 8,604 $ 9,099 $ 13,719
Additions:                      
Provision for loan losses $ 450 $ 300 $ 425 250 $ 0 $ 0 $ 250 0 1,425 250 0
Deductions:                      
Loans charged off                 1,290 2,190 5,828
Less recoveries on loans                 (1,147) (1,445) (1,208)
Net loans charged off                 143 745 4,620
Balance at end of period 9,886       8,604       9,886 8,604 9,099
Commercial, financial, and agricultural                      
Summary of the allowance for loan losses                      
Balance at beginning of period       2,153       1,779 2,153 1,779 2,374
Additions:                      
Provision for loan losses                 690 833 371
Deductions:                      
Loans charged off                 389 1,131 1,285
Less recoveries on loans                 (299) (672) (319)
Net loans charged off                 90 459 966
Balance at end of period 2,753       2,153       2,753 2,153 1,779
Residential real estate | Construction                      
Summary of the allowance for loan losses                      
Balance at beginning of period       59       171 59 171 931
Additions:                      
Provision for loan losses                 49 (434) (592)
Deductions:                      
Loans charged off                 0 0 349
Less recoveries on loans                 0 (322) (181)
Net loans charged off                 0 (322) 168
Balance at end of period 108       59       108 59 171
Residential real estate | Mortgages                      
Summary of the allowance for loan losses                      
Balance at beginning of period       2,439       2,527 2,439 2,527 2,959
Additions:                      
Provision for loan losses                 381 153 (226)
Deductions:                      
Loans charged off                 495 379 408
Less recoveries on loans                 (60) (138) (202)
Net loans charged off                 435 241 206
Balance at end of period 2,385       2,439       2,385 2,439 2,527
Real estate construction - commercial | Construction                      
Summary of the allowance for loan losses                      
Balance at beginning of period       644       466 644 466 631
Additions:                      
Provision for loan losses                 (732) 193 326
Deductions:                      
Loans charged off                 1 15 491
Less recoveries on loans                 (502) 0 0
Net loans charged off                 (501) 15 491
Balance at end of period 413       644       413 644 466
Real estate construction - commercial | Mortgages                      
Summary of the allowance for loan losses                      
Balance at beginning of period       2,935       3,846 2,935 3,846 6,523
Additions:                      
Provision for loan losses                 865 (713) (107)
Deductions:                      
Loans charged off                 147 363 2,890
Less recoveries on loans                 (140) (165) (320)
Net loans charged off                 7 198 2,570
Balance at end of period 3,793       2,935       3,793 2,935 3,846
Installment and other consumer                      
Summary of the allowance for loan losses                      
Balance at beginning of period       273       270 273 270 294
Additions:                      
Provision for loan losses                 113 157 195
Deductions:                      
Loans charged off                 258 302 405
Less recoveries on loans                 (146) (148) (186)
Net loans charged off                 112 154 219
Balance at end of period 274       273       274 273 270
Unallocated                      
Summary of the allowance for loan losses                      
Balance at beginning of period       $ 101       $ 40 101 40 7
Additions:                      
Provision for loan losses                 59 61 33
Deductions:                      
Loans charged off                 0 0 0
Less recoveries on loans                 0 0 0
Net loans charged off                 0 0 0
Balance at end of period $ 160       $ 101       $ 160 $ 101 $ 40