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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Allowance for loan losses, Ending allowance balance attributed to loans $ 110,187 $ 126,859 $ 121,397 $ 120,676 $ 119,674 $ 116,717
Reallocated allowance for loan losses     121,397      
Loans 4,710,513   4,732,685      
Allowance for loan losses as a percentage of loan balance 2.34%          
Reallocated allowance for loan losses as a percentage of loan balance     2.57%      
Recorded investment 4,726,027   4,750,190      
Commercial, Financial And Agricultural [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 12,607 11,791 13,584      
Reallocated allowance for loan losses     11,696      
Loans 755,793   737,902      
Allowance for loan losses as a percentage of loan balance 1.67%          
Reallocated allowance for loan losses as a percentage of loan balance     1.59%      
Recorded investment 758,419   740,788      
Commercial, Financial And Agricultural [Member] | Individually Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 3,265   3,028      
Reallocated allowance for loan losses     3,028      
Commercial, Financial And Agricultural [Member] | Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 9,342   10,556      
Reallocated allowance for loan losses     8,668      
Commercial, Financial And Agricultural [Member] | Loans Individually Evaluated For Impairment [Member]
           
Loans 24,008   19,205      
Allowance for loan losses as a percentage of loan balance 13.60%          
Reallocated allowance for loan losses as a percentage of loan balance     15.77%      
Recorded investment 24,008   19,205      
Commercial, Financial And Agricultural [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Loans 731,785   718,697      
Allowance for loan losses as a percentage of loan balance 1.28%          
Reallocated allowance for loan losses as a percentage of loan balance     1.21%      
Recorded investment 734,411   721,583      
Commercial Real Estate [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 22,470 22,574 28,515      
Reallocated allowance for loan losses     21,911      
Loans 1,257,292 [1]   1,226,616 [1]      
Allowance for loan losses as a percentage of loan balance 1.79%          
Reallocated allowance for loan losses as a percentage of loan balance     1.79%      
Recorded investment 1,262,067 [1]   1,231,420 [1]      
Commercial Real Estate [Member] | Individually Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 9,213   10,001      
Reallocated allowance for loan losses     10,001      
Commercial Real Estate [Member] | Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 13,257   18,514      
Reallocated allowance for loan losses     11,910      
Commercial Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
           
Loans 47,243   57,930      
Allowance for loan losses as a percentage of loan balance 19.50%          
Reallocated allowance for loan losses as a percentage of loan balance     17.26%      
Recorded investment 47,243   57,930      
Commercial Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Loans 1,210,049   1,168,686      
Allowance for loan losses as a percentage of loan balance 1.10%          
Reallocated allowance for loan losses as a percentage of loan balance     1.02%      
Recorded investment 1,214,824   1,173,490      
Construction Real Estate [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 35,280 53,672 46,194      
Reallocated allowance for loan losses     51,953      
Loans 330,332   406,480      
Allowance for loan losses as a percentage of loan balance 10.68%          
Reallocated allowance for loan losses as a percentage of loan balance     12.78%      
Recorded investment 331,163   407,533      
Construction Real Estate [Member] | Individually Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 15,372   26,387      
Reallocated allowance for loan losses     26,387      
Construction Real Estate [Member] | Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 19,908   19,807      
Reallocated allowance for loan losses     25,566      
Construction Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
           
Loans 80,532   113,571      
Allowance for loan losses as a percentage of loan balance 19.09%          
Reallocated allowance for loan losses as a percentage of loan balance     23.23%      
Recorded investment 80,532   113,571      
Construction Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Loans 249,800   292,909      
Allowance for loan losses as a percentage of loan balance 7.97%          
Reallocated allowance for loan losses as a percentage of loan balance     8.73%      
Recorded investment 250,631   293,962      
Residential Real Estate [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 32,105 31,553 25,845      
Reallocated allowance for loan losses     28,793      
Loans 1,713,568   1,692,209      
Allowance for loan losses as a percentage of loan balance 1.87%          
Reallocated allowance for loan losses as a percentage of loan balance     1.70%      
Recorded investment 1,717,878   1,697,670      
Residential Real Estate [Member] | Individually Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 4,960   4,043      
Reallocated allowance for loan losses     4,043      
Residential Real Estate [Member] | Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 27,145   21,802      
Reallocated allowance for loan losses     24,750      
Residential Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
           
Loans 48,594   60,227      
Allowance for loan losses as a percentage of loan balance 10.21%          
Reallocated allowance for loan losses as a percentage of loan balance     6.71%      
Recorded investment 48,594   60,227      
Residential Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Loans 1,664,974   1,631,982      
Allowance for loan losses as a percentage of loan balance 1.63%          
Reallocated allowance for loan losses as a percentage of loan balance     1.52%      
Recorded investment 1,669,284   1,637,443      
Consumer [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 7,721 7,265 7,228      
Reallocated allowance for loan losses     7,039      
Loans 651,250   666,871      
Allowance for loan losses as a percentage of loan balance 1.19%          
Reallocated allowance for loan losses as a percentage of loan balance     1.06%      
Recorded investment 654,188   670,116      
Consumer [Member] | Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 7,721   7,228      
Reallocated allowance for loan losses     7,039      
Consumer [Member] | Loans Individually Evaluated For Impairment [Member]
           
Loans 23          
Recorded investment 23          
Consumer [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Loans 651,227   666,871      
Allowance for loan losses as a percentage of loan balance 1.19%          
Reallocated allowance for loan losses as a percentage of loan balance     1.06%      
Recorded investment 654,165   670,116      
Leases [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 4 4 31      
Reallocated allowance for loan losses     5      
Loans 2,278   2,607      
Allowance for loan losses as a percentage of loan balance 0.18%          
Reallocated allowance for loan losses as a percentage of loan balance     0.19%      
Recorded investment 2,312   2,663      
Leases [Member] | Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 4   31      
Reallocated allowance for loan losses     5      
Leases [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Loans 2,278   2,607      
Allowance for loan losses as a percentage of loan balance 0.18%          
Reallocated allowance for loan losses as a percentage of loan balance     0.19%      
Recorded investment 2,312   2,663      
Individually Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 32,810   43,459      
Reallocated allowance for loan losses     43,459      
Collectively Evaluated For Impairment [Member]
           
Allowance for loan losses, Ending allowance balance attributed to loans 77,377   77,938      
Reallocated allowance for loan losses     77,938      
Loans Individually Evaluated For Impairment [Member]
           
Loans 200,400   250,933      
Allowance for loan losses as a percentage of loan balance 16.37%          
Reallocated allowance for loan losses as a percentage of loan balance     17.32%      
Recorded investment 200,400   250,933      
Loans Collectively Evaluated For Impairment [Member]
           
Loans 4,510,113   4,481,752      
Allowance for loan losses as a percentage of loan balance 1.72%          
Reallocated allowance for loan losses as a percentage of loan balance     1.74%      
Recorded investment $ 4,525,627   $ 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.