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Loans and Allowance for Loan Losses (Details 1) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Summary of the allowance for loan losses          
Balance, beginning of period   $ 13,863,000 $ 13,809,000 $ 14,565,000 $ 15,314,000
Additions:          
Provision for loan losses 4,700,000 2,010,000 7,900,000 5,643,000  
Deductions:          
Loans charged off 3,303,000 3,321,000 5,555,000 8,268,000  
Less recoveries on loans (209,000) (138,000) (766,000) (750,000)  
Net loans charged off 3,094,000 3,183,000 4,789,000 7,518,000  
Balance, end of period 16,920 12,690,000 16,920 12,690,000 15,314,000
Commercial, Financial, and Agricultural [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   2,533,000 1,804,000 2,931,000 3,045,000
Additions:          
Provision for loan losses 1,239,000 562,000 2,469,000 968,000  
Deductions:          
Loans charged off 742,000 1,273,000 846,000 2,146,000  
Less recoveries on loans (18,000) 0 (133,000) (69,000)  
Net loans charged off 724,000 1,273,000 713,000 2,077,000  
Balance, end of period 3,560,000 1,822,000 3,560,000 1,822,000 3,045,000
Real Estate Construction - Residential [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   986,000 1,188,000 2,067,000 709,000
Additions:          
Provision for loan losses (68,000) 284,000 (614,000) 688,000  
Deductions:          
Loans charged off 0 311,000 0 1,858,000  
Less recoveries on loans 0 (2,000) (67,000) (64,000)  
Net loans charged off 0 309,000 (67,000) 1,794,000  
Balance, end of period 641,000 961,000 641,000 961,000 709,000
Real Estate Construction - Commercial [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   1,330,000 1,562,000 1,339,000 1,644,000
Additions:          
Provision for loan losses 90,000 490,000 149,000 231,000  
Deductions:          
Loans charged off 0 512,000 0 512,000  
Less recoveries on loans 0 0 (23,000) (250,000)  
Net loans charged off 0 512,000 (23,000) 262,000  
Balance, end of period 1,734,000 1,308,000 1,734,000 1,308,000 1,644,000
Real Estate Mortgage - Residential [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   2,990,000 3,251,000 3,922,000 3,560,000
Additions:          
Provision for loan losses 118,000 (9,000) 913,000 524,000  
Deductions:          
Loans charged off 41,000 219,000 618,000 1,758,000  
Less recoveries on loans (19,000) (27,000) (110,000) (101,000)  
Net loans charged off 22,000 192,000 508,000 1,657,000  
Balance, end of period 3,656,000 2,789,000 3,656,000 2,789,000 3,560,000
Real Estate Mortgage - Commercial [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   4,837,000 5,734,000 3,458,000 6,107,000
Additions:          
Provision for loan losses 3,241,000 1,550,000 4,793,000 3,641,000  
Deductions:          
Loans charged off 2,366,000 884,000 3,666,000 1,625,000  
Less recoveries on loans (96,000) (40,000) (217,000) (69,000)  
Net loans charged off 2,270,000 844,000 3,449,000 1,556,000  
Balance, end of period 7,078,000 5,543,000 7,078,000 5,543,000 6,107,000
Installment Loans to Individuals [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   219,000 267,000 231,000 232,000
Additions:          
Provision for loan losses 91,000 99,000 187,000 206,000  
Deductions:          
Loans charged off 154,000 122,000 425,000 369,000  
Less recoveries on loans (76,000) (69,000) (216,000) (197,000)  
Net loans charged off 78,000 53,000 209,000 172,000  
Balance, end of period 245,000 265,000 245,000 265,000 232,000
Unallocated [Member]
          
Summary of the allowance for loan losses          
Balance, beginning of period   968,000 3,000 617,000 17,000
Additions:          
Provision for loan losses (11,000) (966,000) 3,000 (615,000)  
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, end of period $ 6,000 $ 2,000 $ 6,000 $ 2,000 $ 17,000