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Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Estimated fair values of company's financial instruments        
Cash and Cash Equivalents $ 1,912,614 $ 1,707,733 $ 1,610,292 $ 1,204,079
Securities held for investment 16,769      
Total loans (net of unearned interest) 3,116,096 3,013,498 2,984,114  
Allowance for loan losses (37,258) (37,656) (37,456)  
Loans, net 3,078,838 2,975,842 2,946,658  
Deposits 5,253,505 5,037,735 4,887,332  
Short-term borrowings 5,665 8,274 12,279  
Long-term borrowings 11,255 18,476 28,049  
Junior subordinated debentures 26,804 36,083 36,083  
Carrying Amount [Member]
        
Estimated fair values of company's financial instruments        
Cash and Cash Equivalents 1,912,614   1,610,292  
Securities held for investment 16,769   22,677  
Total loans (net of unearned interest) 3,116,096   2,984,114  
Allowance for loan losses (37,258)   (37,456)  
Loans, net 3,078,838   2,946,658  
Deposits 5,253,505   4,887,332  
Short-term borrowings 5,665   12,279  
Long-term borrowings 11,255   28,049  
Junior subordinated debentures 26,804   36,083  
Fair Value [Member]
        
Estimated fair values of company's financial instruments        
Cash and Cash Equivalents 1,912,614   1,610,292  
Securities held for investment 17,080   23,257  
Loans, net 3,143,799   2,979,289  
Deposits 5,275,969   4,898,752  
Short-term borrowings 5,665   12,279  
Long-term borrowings 11,333   28,236  
Junior subordinated debentures 28,777   37,691  
Loan commitments 1,300   1,119  
Letters of credit $ 458   $ 439