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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Loan and lease portfolio      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 1,300    
Loans and Leases 10,990,892 $ 10,448,774 $ 9,796,947
Unearned income on loans and leases   15,100  
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 3,100,000 2,900,000  
Net gains related to sales of residential mortgage loans 5,300 1,500 4,900
Commercial      
Loan and lease portfolio      
Loans and Leases 4,213,827 3,979,792 3,766,498
Commercial | Commercial and Industrial      
Loan and lease portfolio      
Loans and Leases 1,379,152 1,331,149  
Commercial | Commercial Mortgage      
Loan and lease portfolio      
Loans and Leases 2,518,051 2,302,356  
Commercial | Construction      
Loan and lease portfolio      
Loans and Leases 194,170 170,061  
Commercial | Lease Financing      
Loan and lease portfolio      
Loans and Leases 122,454 176,226  
Consumer      
Loan and lease portfolio      
Loans and Leases 6,777,065 6,468,982 $ 6,030,449
Consumer | Residential Mortgage      
Loan and lease portfolio      
Loans and Leases 3,891,100 3,673,796  
Consumer | Home Equity      
Loan and lease portfolio      
Loans and Leases 1,676,073 1,681,442  
Consumer | Automobile      
Loan and lease portfolio      
Loans and Leases 720,286 658,133  
Consumer | Other      
Loan and lease portfolio      
Loans and Leases $ 489,606 $ 455,611