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Loans and Allowance for Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of the allowance for loan losses        
Balance at beginning of period $ 14,545 $ 14,640 $ 14,842 $ 13,809
Additions:        
Provision for loan losses 1,000 1,500 2,000 3,200
Deductions:        
Loans charged off 294 1,061 1,875 2,252
Less recoveries on loans (107) (235) (391) (557)
Net loans charged off 187 826 1,484 1,695
Balance at end of period 15,358 15,314 15,358 15,314
Commercial, Financial, and Agricultural
        
Summary of the allowance for loan losses        
Balance at beginning of period 1,828 2,722 1,937 1,804
Additions:        
Provision for loan losses 370 363 279 1,230
Deductions:        
Loans charged off 101 69 162 104
Less recoveries on loans (22) (29) (65) (115)
Net loans charged off 79 40 97 (11)
Balance at end of period 2,119 3,045 2,119 3,045
Real Estate Construction - Residential
        
Summary of the allowance for loan losses        
Balance at beginning of period 899 727 732 1,188
Additions:        
Provision for loan losses 33 (54) 320 (546)
Deductions:        
Loans charged off     120  
Less recoveries on loans   (36)   (67)
Net loans charged off   (36) 120 (67)
Balance at end of period 932 709 932 709
Real Estate Construction - Commercial
        
Summary of the allowance for loan losses        
Balance at beginning of period 1,811 1,410 1,711 1,562
Additions:        
Provision for loan losses 389 211 489 59
Deductions:        
Less recoveries on loans (2) (23) (2) (23)
Net loans charged off (2) (23) (2) (23)
Balance at end of period 2,202 1,644 2,202 1,644
Real Estate Mortgage - Residential
        
Summary of the allowance for loan losses        
Balance at beginning of period 2,921 3,563 3,387 3,251
Additions:        
Provision for loan losses (399) 380 (588) 795
Deductions:        
Loans charged off 95 422 387 577
Less recoveries on loans (29) (39) (44) (91)
Net loans charged off 66 383 343 486
Balance at end of period 2,456 3,560 2,456 3,560
Real Estate Mortgage - Commercial
        
Summary of the allowance for loan losses        
Balance at beginning of period 6,840 5,976 6,834 5,734
Additions:        
Provision for loan losses 591 525 1,436 1,552
Deductions:        
Loans charged off 28 438 1,027 1,300
Less recoveries on loans (12) (44) (172) (121)
Net loans charged off 16 394 855 1,179
Balance at end of period 7,415 6,107 7,415 6,107
Installment Loans to Individuals
        
Summary of the allowance for loan losses        
Balance at beginning of period 243 237 239 267
Additions:        
Provision for loan losses 18 63 65 96
Deductions:        
Loans charged off 70 132 179 271
Less recoveries on loans (42) (64) (108) (140)
Net loans charged off 28 68 71 131
Balance at end of period 233 232 233 232
Unallocated
        
Summary of the allowance for loan losses        
Balance at beginning of period 3 5 2 3
Additions:        
Provision for loan losses (2) 12 (1) 14
Deductions:        
Balance at end of period $ 1 $ 17 $ 1 $ 17