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Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income $ 27,990,048 [1] $ 27,535,532 [1] $ 27,249,793  
Allowance for loan losses 184,911 180,424 187,194 $ 189,555
Total net loans 27,805,137 27,355,108    
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 138,095 130,258    
Commercial | Commercial, financial, and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 17,176,112 16,514,328 15,828,308  
Allowance for loan losses 103,713 98,947 100,238 98,211
Commercial | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 3,946,943 4,030,870 4,234,435  
Allowance for loan losses 34,382 31,311 29,057 28,427
Consumer | Consumer real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 6,151,503 6,249,516 6,355,519  
Allowance for loan losses 24,073 26,439 35,201 39,823
Consumer | Permanent mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 209,260 222,448 270,721  
Allowance for loan losses 10,081 11,000 12,984 13,113
Consumer | Credit Card and Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income 506,230 518,370 560,810  
Allowance for loan losses 12,662 12,727 $ 9,714 $ 9,981
Consumer | Restricted and secured consumer real estate loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, net of unearned income $ 15,000 $ 16,200    
[1] March 31, 2019 and December 31, 2018 include $24.1 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.