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Loans and Allowance for Loan Losses (Details 8) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
Loans that were modified as TDRs          
Troubled debt restructurings $ 19,983,000   $ 19,983,000   $ 22,363,000
Troubled debt restructurings, non-accrual status 12,191,000   12,191,000   14,081,000
Troubled debt restructurings, accrual status 7,792,000   7,792,000   8,282,000
Amount of specific reserves related to TDRs which were allocated to the allowance for loan losses 2,154,000   2,154,000   1,544,000
Number of Contracts 0 0 1 2  
Pre- Modification     619,000 231,000  
Post- Modification     619,000 239,000  
Troubled debt restructurings, debt forgiven     0 0  
Troubled debt restructurings, number of contracts that defaulted within 12 months of modification 0 0 0 0  
Commercial, financial, and agricultural
          
Loans that were modified as TDRs          
Number of Contracts       1  
Pre- Modification       188,000  
Post- Modification       196,000  
Real estate construction - commercial
          
Loans that were modified as TDRs          
Number of Contracts       1  
Pre- Modification       43,000  
Post- Modification       43,000  
Real estate mortgage - residential
          
Loans that were modified as TDRs          
Number of Contracts     1    
Pre- Modification     619,000    
Post- Modification     $ 619,000