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Loans and Allowance for Credit Losses Summary of Delinquency and Non-Performing Status by Portfolio Segment (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 13,536,361 $ 13,111,716 $ 13,030,405
Real-estate - home equity [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,693,649 1,736,688 1,733,036
Real-estate - residential mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,382,085 1,377,068 1,372,033
Construction other [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 57,178 59,512  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 271,696 265,431 278,219
Consumer - direct [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 103,234 109,323  
Consumer - Indirect [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 168,462 156,108  
Leasing and other and overdrafts [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 149,530 119,206 $ 111,148
Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 3,554,138 3,557,905  
Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 9,982,223 $ 9,553,811  
Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans 100.00% 100.00%  
Performing Financing Receivable [Member] | Real-estate - home equity [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 1,671,473 $ 1,711,017  
Performing Financing Receivable [Member] | Real-estate - residential mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 1,336,877 1,321,139  
Performing Financing Receivable [Member] | Construction other [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 56,482 59,180  
Performing Financing Receivable [Member] | Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 264,616 257,376  
Performing Financing Receivable [Member] | Consumer - direct [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 98,576 104,018  
Performing Financing Receivable [Member] | Consumer - Indirect [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 166,040 153,358  
Performing Financing Receivable [Member] | Leasing and other and overdrafts [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income 148,980 118,550  
Performing Financing Receivable [Member] | Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income $ 3,478,428 $ 3,467,262  
Performing Financing Receivable [Member] | Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans 97.90% 97.50%  
Delinquent [Member] | Real-estate - home equity [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] $ 9,069 $ 10,931  
Delinquent [Member] | Real-estate - residential mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] 17,501 26,934  
Delinquent [Member] | Construction other [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] 0 0  
Delinquent [Member] | Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] 5,001 5,465  
Delinquent [Member] | Consumer - direct [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] 2,697 2,891  
Delinquent [Member] | Consumer - Indirect [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] 2,304 2,574  
Delinquent [Member] | Leasing and other and overdrafts [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] 464 523  
Delinquent [Member] | Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [1] $ 32,035 $ 43,853  
Delinquent [Member] | Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans [1] 0.90% 1.20%  
Nonperforming Financing Receivable [Member]      
Financing Receivable, Impaired [Line Items]      
Days past due 90    
Nonperforming Financing Receivable [Member] | Real-estate - home equity [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] $ 13,107 $ 14,740  
Nonperforming Financing Receivable [Member] | Real-estate - residential mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] 27,707 28,995  
Nonperforming Financing Receivable [Member] | Construction other [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] 696 332  
Nonperforming Financing Receivable [Member] | Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] 2,079 2,590  
Nonperforming Financing Receivable [Member] | Consumer - direct [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] 1,961 2,414  
Nonperforming Financing Receivable [Member] | Consumer - Indirect [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] 118 176  
Nonperforming Financing Receivable [Member] | Leasing and other and overdrafts [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] 86 133  
Nonperforming Financing Receivable [Member] | Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member]      
Financing Receivable, Impaired [Line Items]      
Loans, net of unearned income [2] $ 43,675 $ 46,790  
Nonperforming Financing Receivable [Member] | Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans [2] 1.20% 1.30%  
Minimum [Member] | Delinquent [Member]      
Financing Receivable, Impaired [Line Items]      
Days past due 31    
Maximum [Member] | Delinquent [Member]      
Financing Receivable, Impaired [Line Items]      
Days past due 89    
[1] )Includes all accruing loans 31 days to 89 days past due
[2] Includes all accruing loans 90 days or more past due and all non-accrual loans.