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Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income $ 27,350,214 [1]   $ 27,658,929 [1] $ 20,166,091    
Allowance for loan losses 185,959 $ 185,462 189,555 194,867 $ 197,257 $ 202,068
Total net loans 27,164,255   27,469,374      
Commercial, financial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 16,044,145     12,791,844    
Allowance for loan losses 100,314 96,834 98,211 98,205 92,379 89,398
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 4,237,036     2,251,015    
Allowance for loan losses 33,915 33,832 28,427 29,683 30,470 33,852
Consumer real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 6,191,183     4,369,717    
Allowance for loan losses 26,537 31,769 37,371 40,939 46,069 50,357
Permanent mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 347,054     403,082    
Allowance for loan losses 13,480 14,078 15,565 15,719 16,398 16,289
Credit card & other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 530,796     350,433    
Allowance for loan losses 11,713 $ 8,949 9,981 $ 10,321 $ 11,941 $ 12,172
Commercial Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 16,044,145   16,057,273      
Allowance for loan losses 134,229   126,638      
Commercial Portfolio Segment | Commercial, financial and industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 16,044,145   16,057,273      
Commercial Portfolio Segment | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 4,237,036   4,214,695      
Consumer Portfolio Segment | Consumer real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 6,191,183   6,367,755      
Consumer Portfolio Segment | Permanent mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 347,054   399,307      
Consumer Portfolio Segment | Credit card & other            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income 530,796   619,899      
Consumer Portfolio Segment | Restricted real estate loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, net of unearned income $ 17,100   $ 24,200      
[1] September 30, 2018 and December 31, 2017 include $20.8 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.