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Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
day
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 14,963,177 $ 14,699,272 $ 13,870,701
Delinquent | Minimum      
Financing Receivable, Impaired [Line Items]      
Days past due | day 30    
Delinquent | Maximum      
Financing Receivable, Impaired [Line Items]      
Days past due | day 89    
Non-performing      
Financing Receivable, Impaired [Line Items]      
Days past due | day 90    
Real-estate - home equity      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 1,595,901 1,625,115 1,659,481
Real-estate - home equity | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,576,374 1,602,687  
Real-estate - home equity | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 7,295 9,274  
Real-estate - home equity | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 12,232 13,154  
Real-estate - residential mortgage      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,665,142 1,601,994 1,377,459
Real-estate - residential mortgage | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,624,477 1,557,995  
Real-estate - residential mortgage | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 17,068 20,344  
Real-estate - residential mortgage | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 23,597 23,655  
Construction - other      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 46,542 56,970  
Construction - other | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 45,446 55,874  
Construction - other | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 0 0  
Construction - other | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,096 1,096  
Consumer - direct      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 87,182 96,887  
Consumer - direct | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 84,670 93,572  
Consumer - direct | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,383 1,752  
Consumer - direct | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,129 1,563  
Consumer - indirect      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 201,644 194,583  
Consumer - indirect | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 199,542 190,656  
Consumer - indirect | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 2,055 3,599  
Consumer - indirect | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 47 328  
Consumer      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 288,826 291,470 263,221
Consumer | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 284,212 284,228  
Consumer | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 3,438 5,351  
Consumer | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,176 1,891  
Leasing, other and overdrafts      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 243,983 230,976 $ 166,227
Leasing, other and overdrafts | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 242,120 229,591  
Leasing, other and overdrafts | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,425 1,068  
Leasing, other and overdrafts | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 438 317  
Commercial Loans, Commerical Mortgages, Constructions Loans      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 3,840,394 $ 3,806,525  
% of Total 100.00% 100.00%  
Commercial Loans, Commerical Mortgages, Constructions Loans | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 3,772,629 $ 3,730,375  
% of Total 98.20% 98.00%  
Commercial Loans, Commerical Mortgages, Constructions Loans | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 29,226 $ 36,037  
% of Total 0.80% 0.90%  
Commercial Loans, Commerical Mortgages, Constructions Loans | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 38,539 $ 40,113  
% of Total 1.00% 1.10%