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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans$ 100,248$ 110,187$ 121,397$ 117,405$ 120,676$ 116,717
Reallocated allowance for loan losses  121,397   
Loan balance4,680,575 4,732,685   
Allowance for loan losses as a percentage of loan balance2.14%     
Reallocated allowance for loan losses as a percentage of loan balance  2.57%   
Recorded investment4,695,844 4,750,190   
Commercial, Financial And Agricultural [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans11,13312,60713,584   
Reallocated allowance for loan losses  11,696   
Loan balance756,888 737,902   
Allowance for loan losses as a percentage of loan balance1.47%     
Reallocated allowance for loan losses as a percentage of loan balance  1.59%   
Recorded investment759,880 740,788   
Commercial, Financial And Agricultural [Member] | Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans2,511 3,028   
Reallocated allowance for loan losses  3,028   
Commercial, Financial And Agricultural [Member] | Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans8,622 10,556   
Reallocated allowance for loan losses  8,668   
Commercial, Financial And Agricultural [Member] | Loans Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance24,899 19,205   
Allowance for loan losses as a percentage of loan balance10.08%     
Reallocated allowance for loan losses as a percentage of loan balance  15.77%   
Recorded investment24,925 19,205   
Commercial, Financial And Agricultural [Member] | Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance731,989 718,697   
Allowance for loan losses as a percentage of loan balance1.18%     
Reallocated allowance for loan losses as a percentage of loan balance  1.21%   
Recorded investment734,955 721,583   
Commercial Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans18,55922,47028,515   
Reallocated allowance for loan losses  21,911   
Loan balance1,250,936[1] 1,226,616[1]   
Allowance for loan losses as a percentage of loan balance1.48%     
Reallocated allowance for loan losses as a percentage of loan balance  1.79%   
Recorded investment1,256,000[1] 1,231,420[1]   
Commercial Real Estate [Member] | Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans5,183 10,001   
Reallocated allowance for loan losses  10,001   
Commercial Real Estate [Member] | Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans13,376 18,514   
Reallocated allowance for loan losses  11,910   
Commercial Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance44,051 57,930   
Allowance for loan losses as a percentage of loan balance11.77%     
Reallocated allowance for loan losses as a percentage of loan balance  17.26%   
Recorded investment44,099 57,930   
Commercial Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance1,206,885 1,168,686   
Allowance for loan losses as a percentage of loan balance1.11%     
Reallocated allowance for loan losses as a percentage of loan balance  1.02%   
Recorded investment1,211,901 1,173,490   
Construction Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans33,21435,28046,194   
Reallocated allowance for loan losses  51,953   
Loan balance300,741 406,480   
Allowance for loan losses as a percentage of loan balance11.04%     
Reallocated allowance for loan losses as a percentage of loan balance  12.78%   
Recorded investment301,441 407,533   
Construction Real Estate [Member] | Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans20,900 26,387   
Reallocated allowance for loan losses  26,387   
Construction Real Estate [Member] | Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans12,314 19,807   
Reallocated allowance for loan losses  25,566   
Construction Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance75,970 113,571   
Allowance for loan losses as a percentage of loan balance27.51%     
Reallocated allowance for loan losses as a percentage of loan balance  23.23%   
Recorded investment75,997 113,571   
Construction Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance224,771 292,909   
Allowance for loan losses as a percentage of loan balance5.48%     
Reallocated allowance for loan losses as a percentage of loan balance  8.73%   
Recorded investment225,444 293,962   
Residential Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans30,28532,10525,845   
Reallocated allowance for loan losses  28,793   
Loan balance1,729,579 1,692,209   
Allowance for loan losses as a percentage of loan balance1.75%     
Reallocated allowance for loan losses as a percentage of loan balance  1.70%   
Recorded investment1,733,373 1,697,670   
Residential Real Estate [Member] | Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans4,681 4,043   
Reallocated allowance for loan losses  4,043   
Residential Real Estate [Member] | Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans25,604 21,802   
Reallocated allowance for loan losses  24,750   
Residential Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance47,422 60,227   
Allowance for loan losses as a percentage of loan balance9.87%     
Reallocated allowance for loan losses as a percentage of loan balance  6.71%   
Recorded investment47,422 60,227   
Residential Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance1,682,157 1,631,982   
Allowance for loan losses as a percentage of loan balance1.52%     
Reallocated allowance for loan losses as a percentage of loan balance  1.52%   
Recorded investment1,685,951 1,637,443   
Consumer [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans7,0537,7217,228   
Reallocated allowance for loan losses  7,039   
Loan balance640,267 666,871   
Allowance for loan losses as a percentage of loan balance1.10%     
Reallocated allowance for loan losses as a percentage of loan balance  1.06%   
Recorded investment642,946 670,116   
Consumer [Member] | Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans7,053 7,228   
Reallocated allowance for loan losses  7,039   
Consumer [Member] | Loans Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance21     
Recorded investment21     
Consumer [Member] | Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance640,246 666,871   
Allowance for loan losses as a percentage of loan balance1.10%     
Reallocated allowance for loan losses as a percentage of loan balance  1.06%   
Recorded investment642,925 670,116   
Leases [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans4431   
Reallocated allowance for loan losses  5   
Loan balance2,164 2,607   
Allowance for loan losses as a percentage of loan balance0.18%     
Reallocated allowance for loan losses as a percentage of loan balance  0.19%   
Recorded investment2,204 2,663   
Leases [Member] | Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans4 31   
Reallocated allowance for loan losses  5   
Leases [Member] | Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance2,164 2,607   
Allowance for loan losses as a percentage of loan balance0.18%     
Reallocated allowance for loan losses as a percentage of loan balance  0.19%   
Recorded investment2,204 2,663   
Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans33,275 43,459   
Reallocated allowance for loan losses  43,459   
Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses, Ending allowance balance attributed to loans66,973 77,938   
Reallocated allowance for loan losses  77,938   
Loans Individually Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance192,363 250,933   
Allowance for loan losses as a percentage of loan balance17.30%     
Reallocated allowance for loan losses as a percentage of loan balance  17.32%   
Recorded investment192,464 250,933   
Loans Collectively Evaluated For Impairment [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loan balance4,488,212 4,481,752   
Allowance for loan losses as a percentage of loan balance1.49%     
Reallocated allowance for loan losses as a percentage of loan balance  1.74%   
Recorded investment$ 4,503,380 $ 4,499,257   
[1]Included within commercial, financial and agricultural loans, commercial real estate loans, and Vision commercial land and development loans are an immaterial amount of consumer loans that are not broken out by class.