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Loans and Asset Quality Information (Details 11) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Impaired loans with no related allowance - Recorded Investment $ 74,745 $ 79,423 $ 79,815
Imapired loans with no related allowance - Unpaid Principal Balance 120,314 124,387  
Impaired loans with no related allowance - Average Recorded Investment 67,623 86,265  
Impaired loans with allowance - Recorded Investment 88,754 61,553  
Impaired loans with allowance - Unpaid Principal Balance 104,405 69,674  
Impaired loans with related allowance - Related Allowance 13,484 10,910 7,716
Impaired loans with related allowance - Average Recorded Investment 80,632 66,047  
Non-covered
      
Impaired loans with no related allowance - Recorded Investment 34,150 35,721 35,897
Imapired loans with no related allowance - Unpaid Principal Balance 41,164 45,809  
Impaired loans with no related allowance - Average Recorded Investment 27,206 37,235  
Impaired loans with allowance - Recorded Investment 73,785 49,565  
Impaired loans with allowance - Unpaid Principal Balance 85,734 54,004  
Impaired loans with related allowance - Related Allowance 9,410 5,804 5,429
Impaired loans with related allowance - Average Recorded Investment 64,821 51,788  
Non-covered | Commercial Unsecured
      
Impaired loans with no related allowance - Recorded Investment        
Imapired loans with no related allowance - Unpaid Principal Balance        
Impaired loans with no related allowance - Average Recorded Investment        
Impaired loans with allowance - Recorded Investment 103 452  
Impaired loans with allowance - Unpaid Principal Balance 444 454  
Impaired loans with related allowance - Related Allowance 43 59  
Impaired loans with related allowance - Average Recorded Investment 199 226  
Non-covered | Commercial Secured
      
Impaired loans with no related allowance - Recorded Investment    295  
Imapired loans with no related allowance - Unpaid Principal Balance    478  
Impaired loans with no related allowance - Average Recorded Investment 108 504  
Impaired loans with allowance - Recorded Investment 3,386 1,895  
Impaired loans with allowance - Unpaid Principal Balance 4,000 1,899  
Impaired loans with related allowance - Related Allowance 980 295  
Impaired loans with related allowance - Average Recorded Investment 2,281 1,427  
Non-covered | Secured by Inventory and Accounts Receivable
      
Impaired loans with no related allowance - Recorded Investment    27  
Imapired loans with no related allowance - Unpaid Principal Balance    493  
Impaired loans with no related allowance - Average Recorded Investment 7 124  
Impaired loans with allowance - Recorded Investment 701 561  
Impaired loans with allowance - Unpaid Principal Balance 788 571  
Impaired loans with related allowance - Related Allowance 153 156  
Impaired loans with related allowance - Average Recorded Investment 680 391  
Non-covered | Real Estate construction, land development and other land loans
      
Impaired loans with no related allowance - Recorded Investment 11,748 15,105  
Imapired loans with no related allowance - Unpaid Principal Balance 16,202 20,941  
Impaired loans with no related allowance - Average Recorded Investment 9,681 17,876  
Impaired loans with allowance - Recorded Investment 10,983 10,360  
Impaired loans with allowance - Unpaid Principal Balance 14,508 12,606  
Impaired loans with related allowance - Related Allowance 3,006 2,244  
Impaired loans with related allowance - Average Recorded Investment 14,266 15,782  
Non-covered | Real estate residential, farmland and mutli-family
      
Impaired loans with no related allowance - Recorded Investment 2,346 3,442  
Imapired loans with no related allowance - Unpaid Principal Balance 2,787 4,741  
Impaired loans with no related allowance - Average Recorded Investment 2,966 5,278  
Impaired loans with allowance - Recorded Investment 37,696 24,460  
Impaired loans with allowance - Unpaid Principal Balance 41,507 26,153  
Impaired loans with related allowance - Related Allowance 3,202 2,169  
Impaired loans with related allowance - Average Recorded Investment 28,018 22,487  
Non-covered | Real estate home equity lines of credit
      
Impaired loans with no related allowance - Recorded Investment 274 46  
Imapired loans with no related allowance - Unpaid Principal Balance 581 300  
Impaired loans with no related allowance - Average Recorded Investment 80 79  
Impaired loans with allowance - Recorded Investment 2,960 3,115  
Impaired loans with allowance - Unpaid Principal Balance 4,085 3,141  
Impaired loans with related allowance - Related Allowance 155 117  
Impaired loans with related allowance - Average Recorded Investment 3,215 2,544  
Non-covered | Real estate commercial
      
Impaired loans with no related allowance - Recorded Investment 19,782 16,794  
Imapired loans with no related allowance - Unpaid Principal Balance 21,594 18,817  
Impaired loans with no related allowance - Average Recorded Investment 14,361 13,359  
Impaired loans with allowance - Recorded Investment 15,136 5,965  
Impaired loans with allowance - Unpaid Principal Balance 17,543 6,421  
Impaired loans with related allowance - Related Allowance 1,560 283  
Impaired loans with related allowance - Average Recorded Investment 13,365 6,602  
Non-covered | Consumer
      
Impaired loans with no related allowance - Recorded Investment    12  
Imapired loans with no related allowance - Unpaid Principal Balance    39  
Impaired loans with no related allowance - Average Recorded Investment 3 15  
Impaired loans with allowance - Recorded Investment 2,820 2,757  
Impaired loans with allowance - Unpaid Principal Balance 2,859 2,759  
Impaired loans with related allowance - Related Allowance 311 481  
Impaired loans with related allowance - Average Recorded Investment 2,797 2,329  
Covered
      
Impaired loans with no related allowance - Recorded Investment 40,595 43,702 43,918
Imapired loans with no related allowance - Unpaid Principal Balance 79,150 78,578  
Impaired loans with no related allowance - Average Recorded Investment 40,417 49,030  
Impaired loans with allowance - Recorded Investment 14,969 11,988  
Impaired loans with allowance - Unpaid Principal Balance 18,671 15,670  
Impaired loans with related allowance - Related Allowance 4,074 5,106 2,287
Impaired loans with related allowance - Average Recorded Investment $ 15,811 $ 14,259