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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Loans and leases    
Loans and leases $ 12,149,711 $ 11,520,378
Unearned income, including net deferred loan costs 29,500 23,800
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,300,000 2,100,000
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 905,200 935,700
Real estate    
Loans and leases    
Loans and leases 7,225,929 6,589,966
Commercial and Industrial    
Loans and leases    
Loans and leases 3,190,237 3,239,600
Commercial Real Estate    
Loans and leases    
Loans and leases 2,625,688 2,343,495
Commercial Real Estate | Real estate    
Loans and leases    
Loans and leases 2,625,688 2,343,495
Construction    
Loans and leases    
Loans and leases 598,763 450,012
Construction | Real estate    
Loans and leases    
Loans and leases 598,763 450,012
Residential    
Loans and leases    
Loans and leases 4,001,478 3,796,459
Real estate loans in the process of foreclosure 2,400 4,100
Residential | Real estate    
Loans and leases    
Loans and leases 4,001,478 3,796,459
Consumer    
Loans and leases    
Loans and leases 1,562,172 1,510,772
Lease Financing    
Loans and leases    
Loans and leases $ 171,373 $ 180,040