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Loans and Leases and the Allowance for Loan and Lease Losses (Loans and Leases Portolio & Narrative) (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loan and lease portfolio      
Loans and Leases $ 10,448,774 $ 9,796,947 $ 8,949,785
Unearned income on loans and leases 15,100 20,200  
Commercial loans and residential mortgage loans pledged to secure an undrawn FRB line of credit 1,000,000 1,000,000  
Residential mortgage loans pledged under a blanket pledge arrangement to secure FHLB advance 2,900,000 2,900,000  
Net gains related to sales of residential mortgage loans 1,500 4,900 11,800
Commercial      
Loan and lease portfolio      
Loans and Leases 3,979,792 3,766,498 3,617,692
Commercial | Commercial and Industrial      
Loan and lease portfolio      
Loans and Leases 1,331,149 1,279,347  
Commercial | Commercial Mortgage      
Loan and lease portfolio      
Loans and Leases 2,302,356 2,103,967  
Commercial | Construction      
Loan and lease portfolio      
Loans and Leases 170,061 202,253  
Commercial | Lease Financing      
Loan and lease portfolio      
Loans and Leases 176,226 180,931  
Consumer      
Loan and lease portfolio      
Loans and Leases 6,468,982 6,030,449 $ 5,332,093
Consumer | Residential Mortgage      
Loan and lease portfolio      
Loans and Leases 3,673,796 3,466,773  
Consumer | Home Equity      
Loan and lease portfolio      
Loans and Leases 1,681,442 1,585,455  
Consumer | Automobile      
Loan and lease portfolio      
Loans and Leases 658,133 528,474  
Consumer | Other      
Loan and lease portfolio      
Loans and Leases $ 455,611 $ 449,747