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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Loans and leases    
Loans and leases $ 12,464,165 $ 12,277,369
Unearned income, including net deferred loan costs 33,100 31,200
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,500,000 2,400,000
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 914,200 914,500
Real estate    
Loans and leases    
Loans and leases 7,488,826 7,390,561
Commercial and Industrial    
Loans and leases    
Loans and leases 3,219,210 3,135,266
Commercial Real Estate    
Loans and leases    
Loans and leases 2,738,557 2,667,597
Commercial Real Estate | Real estate    
Loans and leases    
Loans and leases 2,738,557 2,667,597
Construction    
Loans and leases    
Loans and leases 594,266 632,911
Construction | Real estate    
Loans and leases    
Loans and leases 594,266 632,911
Residential    
Loans and leases    
Loans and leases 4,156,003 4,090,053
Real estate loans in the process of foreclosure 4,300 3,300
Residential | Real estate    
Loans and leases    
Loans and leases 4,156,003 4,090,053
Consumer    
Loans and leases    
Loans and leases 1,595,989 1,586,476
Lease Financing    
Loans and leases    
Loans and leases $ 160,140 $ 165,066