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Loans and Leases and the Allowance for Loan and Lease Losses (Loans and Leases Portfolio and Narrative) (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Loan and lease portfolio      
Loans and Leases $ 9,916,628 $ 9,113,809 $ 9,796,947
Net Gains Related to Sales of Residential Mortgage Loans 300 1,300  
Commercial      
Loan and lease portfolio      
Loans and Leases 3,792,736 3,630,495 3,766,498
Commercial | Commercial and Industrial      
Loan and lease portfolio      
Loans and Leases 1,329,096   1,279,347
Commercial | Commercial Mortgage      
Loan and lease portfolio      
Loans and Leases 2,097,339   2,103,967
Commercial | Construction      
Loan and lease portfolio      
Loans and Leases 186,530   202,253
Commercial | Lease Financing      
Loan and lease portfolio      
Loans and Leases 179,771   180,931
Consumer      
Loan and lease portfolio      
Loans and Leases 6,123,892 $ 5,483,314 6,030,449
Consumer | Residential Mortgage      
Loan and lease portfolio      
Loans and Leases 3,505,239   3,466,773
Consumer | Home Equity      
Loan and lease portfolio      
Loans and Leases 1,601,698   1,585,455
Consumer | Automobile      
Loan and lease portfolio      
Loans and Leases 558,468   528,474
Consumer | Other      
Loan and lease portfolio      
Loans and Leases $ 458,487   $ 449,747