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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, 2018
USD ($)
day
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 15,696,284 $ 15,768,247 $ 14,963,177
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 $ 1,514,241 1,559,719 1,595,901
Real-estate - home equity | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,493,485 1,535,557  
Real-estate - home equity | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 8,731 12,655  
Real-estate - home equity | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 12,025 11,507  
Real estate - residential mortgage      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,976,524 1,954,711 1,665,142
Real estate - residential mortgage | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,938,817 1,914,888  
Real estate - residential mortgage | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 17,539 18,852  
Real estate - residential mortgage | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 20,168 20,971  
Construction - other      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 68,853 78,017  
Construction - other | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 68,363 77,403  
Construction - other | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 0 203  
Construction - other | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 490 411  
Consumer      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 56,058 55,213  
Consumer | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 55,681 54,828  
Consumer | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 323 315  
Consumer | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 54 70  
Consumer - indirect      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 270,708 258,570  
Consumer - indirect | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 267,584 254,663  
Consumer - indirect | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 2,931 3,681  
Consumer - indirect | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 193 226  
Consumer      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 326,766 313,783 288,826
Consumer | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 323,265 309,491  
Consumer | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 3,254 3,996  
Consumer | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 247 296  
Leasing, other and overdrafts      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 271,042 267,998 $ 243,983
Leasing, other and overdrafts | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 270,027 267,111  
Leasing, other and overdrafts | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 843 855  
Leasing, other and overdrafts | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 172 32  
Real Estate, Consumer, Leasing And Other Loans [Member] [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 4,157,426 4,174,228  
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 4,093,957 4,104,450  
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Delinquent      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 30,367 36,561  
Real Estate, Consumer, Leasing And Other Loans [Member] [Member] | Non-performing      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 33,102 $ 33,217  
Commercial Loans, Commerical Mortgages, Constructions Loans      
Financing Receivable, Impaired [Line Items]      
% of Total 100.00% 100.00%  
Commercial Loans, Commerical Mortgages, Constructions Loans | Performing      
Financing Receivable, Impaired [Line Items]      
% of Total 98.50% 98.30%  
Commercial Loans, Commerical Mortgages, Constructions Loans | Delinquent      
Financing Receivable, Impaired [Line Items]      
% of Total 0.70% 0.90%  
Commercial Loans, Commerical Mortgages, Constructions Loans | Non-performing      
Financing Receivable, Impaired [Line Items]      
% of Total 0.80% 0.80%