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Loans and Allowance for Loan Losses (Details 2) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment $ 4,092,000 $ 4,020,000
Collectively evaluated for impairment 10,453,000 10,822,000
Total 14,545,000 14,842,000
Individually evaluated for impairment 38,463,000 39,189,000
Collectively evaluated for impairment 795,793,000 807,795,000
Total 834,256,000 846,984,000
Commercial, Financial, and Agricultural [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 229,000 213,000
Collectively evaluated for impairment 1,599,000 1,724,000
Total 1,828,000 1,937,000
Individually evaluated for impairment 3,743,000 4,157,000
Collectively evaluated for impairment 123,271,000 125,883,000
Total 127,014,000 130,040,000
Real Estate Construction - Residential [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 294,000 125,000
Collectively evaluated for impairment 605,000 607,000
Total 899,000 732,000
Individually evaluated for impairment 2,589,000 2,496,000
Collectively evaluated for impairment 19,979,000 19,681,000
Total 22,568,000 22,177,000
Real Estate Construction - Commercial [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 534,000 542,000
Collectively evaluated for impairment 1,277,000 1,169,000
Total 1,811,000 1,711,000
Individually evaluated for impairment 8,689,000 7,762,000
Collectively evaluated for impairment 37,678,000 35,724,000
Total 46,367,000 43,486,000
Real Estate Mortgage - Residential [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 1,133,000 1,069,000
Collectively evaluated for impairment 1,788,000 2,318,000
Total 2,921,000 3,387,000
Individually evaluated for impairment 5,980,000 5,771,000
Collectively evaluated for impairment 209,939,000 215,452,000
Total 215,919,000 221,223,000
Real Estate Mortgage - Commercial [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 1,896,000 2,071,000
Collectively evaluated for impairment 4,944,000 4,763,000
Total 6,840,000 6,834,000
Individually evaluated for impairment 17,418,000 18,959,000
Collectively evaluated for impairment 381,137,000 386,133,000
Total 398,555,000 405,092,000
Installment Loans to Individuals [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 6,000 0
Collectively evaluated for impairment 237,000 239,000
Total 243,000 239,000
Individually evaluated for impairment 44,000 44,000
Collectively evaluated for impairment 23,789,000 24,922,000
Total 23,833,000 24,966,000
Unallocated [Member]
    
Allowance for loan losses by impairment methodology    
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 3,000 2,000
Total 3,000 2,000
Individually evaluated for impairment 0 0
Collectively evaluated for impairment 0 0
Total $ 0 $ 0