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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Loans and leases    
Loans and leases $ 11,396,555 $ 10,722,030
Unearned income, including net deferred loan costs 21,900 17,200
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,000,000 2,500,000
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 935,600 814,200
Real estate    
Loans and leases    
Loans and leases 6,474,867 6,064,335
Commercial and Industrial    
Loans and leases    
Loans and leases 3,265,291 3,057,455
Commercial Real Estate    
Loans and leases    
Loans and leases 2,311,874 2,164,448
Commercial Real Estate | Real estate    
Loans and leases    
Loans and leases 2,311,874 2,164,448
Construction    
Loans and leases    
Loans and leases 475,333 367,460
Construction | Real estate    
Loans and leases    
Loans and leases 475,333 367,460
Residential    
Loans and leases    
Loans and leases 3,687,660 3,532,427
Real estate loans in the process of foreclosure 4,000 11,300
Residential | Real estate    
Loans and leases    
Loans and leases 3,687,660 3,532,427
Consumer    
Loans and leases    
Loans and leases 1,469,220 1,401,561
Lease Financing    
Loans and leases    
Loans and leases $ 187,177 $ 198,679