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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 $ 107,310 $ 120,174 $ 143,575 $ 117,405 $ 120,676 $ 116,717
Reallocated allowance for loan losses     143,575      
Loan balance 4,680,575   4,732,685      
Allowance for loan losses as a percentage of loan balance 2.29%          
Reallocated allowance for loan losses as a percentage of loan balance     3.03%      
Recorded investment 4,695,844   4,750,190      
Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 40,337   66,904      
Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 66,973   76,671      
Loans Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 192,363   250,933      
Allowance for loan losses as a percentage of loan balance 20.97%          
Reallocated allowance for loan losses as a percentage of loan balance     26.66%      
Recorded investment 192,464   250,933      
Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 4,488,212   4,481,752      
Allowance for loan losses as a percentage of loan balance 1.49%          
Reallocated allowance for loan losses as a percentage of loan balance     1.71%      
Recorded investment 4,503,380   4,499,257      
Commercial, Financial And Agricultural [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 15,022 16,709 11,555      
Reallocated allowance for loan losses     11,555      
Loan balance 756,888   737,902      
Allowance for loan losses as a percentage of loan balance 1.98%          
Reallocated allowance for loan losses as a percentage of loan balance     1.57%      
Recorded investment 759,880   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 loans 6,400   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 loans 8,622   8,527      
Commercial, Financial And Agricultural [Member] | Loans Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 24,899   19,205      
Allowance for loan losses as a percentage of loan balance 25.70%          
Reallocated allowance for loan losses as a percentage of loan balance     15.77%      
Recorded investment 24,925   19,205      
Commercial, Financial And Agricultural [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 731,989   718,697      
Allowance for loan losses as a percentage of loan balance 1.18%          
Reallocated allowance for loan losses as a percentage of loan balance     1.19%      
Recorded investment 734,955   721,583      
Commercial Real Estate [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 18,559 23,307 24,369      
Reallocated allowance for loan losses     24,369      
Loan balance 1,250,936 [1]   1,226,616 [1]      
Allowance for loan losses as a percentage of loan balance 1.48%          
Reallocated allowance for loan losses as a percentage of loan balance     1.99%      
Recorded investment 1,256,000 [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 loans 5,183   12,652      
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 loans 13,376   11,717      
Commercial Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 44,051   57,930      
Allowance for loan losses as a percentage of loan balance 11.77%          
Reallocated allowance for loan losses as a percentage of loan balance     21.84%      
Recorded investment 44,099   57,930      
Commercial Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 1,206,885   1,168,686      
Allowance for loan losses as a percentage of loan balance 1.11%          
Reallocated allowance for loan losses as a percentage of loan balance     1.00%      
Recorded investment 1,211,901   1,173,490      
Construction Real Estate [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 36,387 40,113 70,462      
Reallocated allowance for loan losses     70,462      
Loan balance 300,741   406,480      
Allowance for loan losses as a percentage of loan balance 12.10%          
Reallocated allowance for loan losses as a percentage of loan balance     17.33%      
Recorded investment 301,441   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 loans 24,073   45,312      
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 loans 12,314   25,150      
Construction Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 75,970   113,571      
Allowance for loan losses as a percentage of loan balance 31.69%          
Reallocated allowance for loan losses as a percentage of loan balance     39.90%      
Recorded investment 75,997   113,571      
Construction Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 224,771   292,909      
Allowance for loan losses as a percentage of loan balance 5.48%          
Reallocated allowance for loan losses as a percentage of loan balance     8.59%      
Recorded investment 225,444   293,962      
Residential Real Estate [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 30,285 32,297 30,259      
Reallocated allowance for loan losses     30,259      
Loan balance 1,729,579   1,692,209      
Allowance for loan losses as a percentage of loan balance 1.75%          
Reallocated allowance for loan losses as a percentage of loan balance     1.79%      
Recorded investment 1,733,373   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 loans 4,681   5,912      
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 loans 25,604   24,347      
Residential Real Estate [Member] | Loans Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 47,422   60,227      
Allowance for loan losses as a percentage of loan balance 9.87%          
Reallocated allowance for loan losses as a percentage of loan balance     9.82%      
Recorded investment 47,422   60,227      
Residential Real Estate [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 1,682,157   1,631,982      
Allowance for loan losses as a percentage of loan balance 1.52%          
Reallocated allowance for loan losses as a percentage of loan balance     1.49%      
Recorded investment 1,685,951   1,637,443      
Consumer [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 7,053 7,744 6,925      
Reallocated allowance for loan losses     6,925      
Loan balance 640,267   666,871      
Allowance for loan losses as a percentage of loan balance 1.10%          
Reallocated allowance for loan losses as a percentage of loan balance     1.04%      
Recorded investment 642,946   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 loans 7,053   6,925      
Consumer [Member] | Loans Individually Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 21          
Recorded investment 21          
Consumer [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 640,246   666,871      
Allowance for loan losses as a percentage of loan balance 1.10%          
Reallocated allowance for loan losses as a percentage of loan balance     1.04%      
Recorded investment 642,925   670,116      
Leases [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loan losses, Ending allowance balance attributed to loans 4 4 5      
Reallocated allowance for loan losses     5      
Loan balance 2,164   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 2,204   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 loans 4   5      
Leases [Member] | Loans Collectively Evaluated For Impairment [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loan balance 2,164   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 $ 2,204   $ 2,663      
[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.