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Loans and Allowance for Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Summary of the allowance for loan losses    
Balance at beginning of period $ 13,719 $ 14,842
Additions:    
Provision for loan losses   1,000
Deductions:    
Loans charged off 1,176 1,581
Less recoveries on loans (302) (284)
Net loans charged off 874 1,297
Balance at end of period 12,845 14,545
Commercial, Financial, and Agricultural
    
Summary of the allowance for loan losses    
Balance at beginning of period 2,374 1,937
Additions:    
Provision for loan losses 93 (90)
Deductions:    
Loans charged off 131 61
Less recoveries on loans (116) (42)
Net loans charged off 15 19
Balance at end of period 2,452 1,828
Real Estate Construction - Residential
    
Summary of the allowance for loan losses    
Balance at beginning of period 931 732
Additions:    
Provision for loan losses (392) 287
Deductions:    
Loans charged off 60 120
Net loans charged off 60 120
Balance at end of period 479 899
Real Estate Construction - Commercial
    
Summary of the allowance for loan losses    
Balance at beginning of period 631 1,711
Additions:    
Provision for loan losses 333 100
Deductions:    
Loans charged off 414  
Net loans charged off 414  
Balance at end of period 550 1,811
Real Estate Mortgage - Residential
    
Summary of the allowance for loan losses    
Balance at beginning of period 2,959 3,387
Additions:    
Provision for loan losses 139 (189)
Deductions:    
Loans charged off 120 292
Less recoveries on loans (112) (15)
Net loans charged off 8 277
Balance at end of period 3,090 2,921
Real Estate Mortgage - Commercial
    
Summary of the allowance for loan losses    
Balance at beginning of period 6,523 6,834
Additions:    
Provision for loan losses (153) 844
Deductions:    
Loans charged off 367 999
Less recoveries on loans (16) (161)
Net loans charged off 351 838
Balance at end of period 6,019 6,840
Installment Loans to Individuals
    
Summary of the allowance for loan losses    
Balance at beginning of period 294 239
Additions:    
Provision for loan losses (13) 47
Deductions:    
Loans charged off 84 109
Less recoveries on loans (58) (66)
Net loans charged off 26 43
Balance at end of period 255 243
Unallocated
    
Summary of the allowance for loan losses    
Balance at beginning of period 7 2
Additions:    
Provision for loan losses (7) 1
Deductions:    
Balance at end of period   $ 3