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Loans and Allowance for Loan Losses (Details 4) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded $ 12,956 $ 23,223
Recorded Investment, With an allowance recorded 29,244 30,397
Total impaired loans 42,200 53,620
Unpaid Principal Balance, With no related allowance recorded 13,587 30,190
Unpaid Principal Balance, With an allowance recorded 30,107 30,960
Unpaid Principal Balance, Total impaired loans 43,694 61,150
Impaired Financing Receivable With No Related Allowance Amount Recorded 0 0
Related Allowance 5,862 3,748
Commercial, financial, and agricultural [Member]
   
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded 2,849 3,546
Recorded Investment, With an allowance recorded 2,828 882
Unpaid Principal Balance, With no related allowance recorded 2,955 3,625
Unpaid Principal Balance, With an allowance recorded 2,877 904
Impaired Financing Receivable With No Related Allowance Amount Recorded 0 0
Related Allowance 1,952 239
Real estate construction - residential [Member]
   
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded 2,350 584
Recorded Investment, With an allowance recorded 189 563
Unpaid Principal Balance, With no related allowance recorded 2,379 788
Unpaid Principal Balance, With an allowance recorded 189 563
Impaired Financing Receivable With No Related Allowance Amount Recorded 0 0
Related Allowance 60 167
Real estate construction - commercial [Member]
   
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded 1,879 1,459
Recorded Investment, With an allowance recorded 6,011 6,409
Unpaid Principal Balance, With no related allowance recorded 2,110 1,756
Unpaid Principal Balance, With an allowance recorded 6,115 6,448
Impaired Financing Receivable With No Related Allowance Amount Recorded 0 0
Related Allowance 553 380
Real estate - residential [Member]
   
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded 2,138 2,315
Recorded Investment, With an allowance recorded 3,169 4,254
Unpaid Principal Balance, With no related allowance recorded 2,501 2,654
Unpaid Principal Balance, With an allowance recorded 3,324 4,265
Impaired Financing Receivable With No Related Allowance Amount Recorded 0 0
Related Allowance 858 653
Real estate - commercial [Member]
   
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded 3,538 15,151
Recorded Investment, With an allowance recorded 17,047 18,289
Unpaid Principal Balance, With no related allowance recorded 3,409 21,190
Unpaid Principal Balance, With an allowance recorded 17,602 18,780
Impaired Financing Receivable With No Related Allowance Amount Recorded 0 0
Related Allowance 2,439 2,309
Installment Loans to Individuals [Member]
   
Additional information about impaired loans    
Recorded Investment, With no related allowance recorded 202 168
Unpaid Principal Balance, With no related allowance recorded 233 177
Impaired Financing Receivable With No Related Allowance Amount Recorded $ 0 $ 0