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Fair Value Accounting (Carrying And Estimated Fair Values Of Financial Instruments Carried On Balance Sheet) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks $ 614,630 $ 510,423  
Interest bearing funds with Federal Reserve Bank 1,498,390 1,567,006  
Interest earning deposits with banks 23,442 13,590  
Federal funds sold and securities purchased under resale agreements 113,517 158,916  
Trading account assets 11,102 16,866  
Mortgage loans held for sale 212,663 161,509  
Other loans held for sale 10,690 30,156  
Investment securities available for sale 2,981,112 3,690,125  
Private equity investments 31,876 22,015  
Loans, net 19,168,285 19,543,319  
Derivative asset positions 64,662 84,923  
Non-interest bearing deposits 5,665,527 5,366,868  
Interest bearing deposits 15,391,517 17,044,884  
Federal funds purchased and other short-term borrowings 201,243 313,757 499,226
Salary stock units 1,900    
Long-term debt 1,726,455 1,364,727  
Level 1 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 614,630    
Interest bearing funds with Federal Reserve Bank 1,498,390    
Interest earning deposits with banks 23,442    
Federal funds sold and securities purchased under resale agreements 113,517    
Trading account assets 0    
Mortgage loans held for sale 0    
Other loans held for sale 0    
Investment securities available for sale 3,205    
Private equity investments 0    
Mutual funds held In Rabbi Trusts 10,001    
Loans, net 0    
Derivative asset positions 0    
Trading accoun liabilities 0    
Non-interest bearing deposits 0    
Interest bearing deposits 0    
Federal funds purchased and other short-term borrowings 0    
Salary stock units 1,888    
Long-term debt 0    
Derivative liability positions 0    
Level 2 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 0    
Interest bearing funds with Federal Reserve Bank 0    
Interest earning deposits with banks 0    
Federal funds sold and securities purchased under resale agreements 0    
Trading account assets 11,102    
Mortgage loans held for sale 212,663    
Other loans held for sale 0    
Investment securities available for sale 2,974,729    
Private equity investments 1,168    
Mutual funds held In Rabbi Trusts 0    
Loans, net 0    
Derivative asset positions 64,662    
Trading accoun liabilities 91    
Non-interest bearing deposits 5,665,527    
Interest bearing deposits 15,415,160    
Federal funds purchased and other short-term borrowings 201,243    
Salary stock units 0    
Long-term debt 1,784,223    
Derivative liability positions 63,437    
Level 3 [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 0    
Interest bearing funds with Federal Reserve Bank 0    
Interest earning deposits with banks 0    
Federal funds sold and securities purchased under resale agreements 0    
Trading account assets 0    
Mortgage loans held for sale 0    
Other loans held for sale 10,690    
Investment securities available for sale 3,178    
Private equity investments 30,708    
Mutual funds held In Rabbi Trusts 0    
Loans, net 19,254,199    
Derivative asset positions 0    
Trading accoun liabilities 0    
Non-interest bearing deposits 0    
Interest bearing deposits 0    
Federal funds purchased and other short-term borrowings 0    
Salary stock units 0    
Long-term debt 0    
Derivative liability positions 2,956    
Carrying Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 614,630 510,423  
Interest bearing funds with Federal Reserve Bank 1,498,390 1,567,006  
Interest earning deposits with banks 23,442 13,590  
Federal funds sold and securities purchased under resale agreements 113,517 158,916  
Trading account assets 11,102 16,866  
Mortgage loans held for sale 212,663 161,509  
Other loans held for sale 10,690 30,156  
Investment securities available for sale 2,981,112 3,690,125  
Private equity investments 31,876 22,015  
Mutual funds held In Rabbi Trusts 10,001 10,353  
Loans, net 19,541,690 20,079,813  
Derivative asset positions 64,662 84,923  
Trading accoun liabilities 91    
Non-interest bearing deposits 5,665,527 5,366,868  
Interest bearing deposits 15,391,517 17,044,884  
Federal funds purchased and other short-term borrowings 201,243 313,757  
Salary stock units 1,888    
Long-term debt 1,726,455 1,364,727  
Derivative liability positions 66,393 96,574  
Estimated Fair Value [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 614,630 510,423  
Interest bearing funds with Federal Reserve Bank 1,498,390 1,567,006  
Interest earning deposits with banks 23,442 13,590  
Federal funds sold and securities purchased under resale agreements 113,517 158,916  
Trading account assets 11,102 16,866  
Mortgage loans held for sale 212,663 161,509  
Other loans held for sale 10,690 30,156  
Investment securities available for sale 2,981,112 3,690,125  
Private equity investments 31,876 22,015  
Mutual funds held In Rabbi Trusts 10,001 10,353  
Loans, net 19,254,199 19,621,279  
Derivative asset positions 64,662 84,923  
Trading accoun liabilities 91    
Non-interest bearing deposits 5,665,527 5,366,868  
Interest bearing deposits 15,415,160 17,092,784  
Federal funds purchased and other short-term borrowings 201,243 313,757  
Salary stock units 1,888    
Long-term debt 1,784,223 1,302,560  
Derivative liability positions 66,393 96,574  
Equity Securities [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities available for sale $ 3,740 $ 3,759