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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Loans and leases    
Loans and leases $ 13,197,454 $ 13,076,191
Outstanding loan balances, net deferred loan costs 37,300 36,300
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,600,000 2,500,000
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 937,400 957,000
Real estate    
Loans and leases    
Loans and leases 4,451,793 4,439,618
Commercial and Industrial    
Loans and leases    
Loans and leases 3,203,770 3,208,760
Commercial Real Estate    
Loans and leases    
Loans and leases 3,147,304 2,990,783
Commercial Real Estate | Real estate    
Loans and leases    
Loans and leases 3,147,304 2,990,783
Construction    
Loans and leases    
Loans and leases 595,491 626,757
Construction | Real estate    
Loans and leases    
Loans and leases 595,491 626,757
Residential    
Loans and leases    
Loans and leases 4,451,793 4,439,618
Real estate loans in the process of foreclosure 4,900 4,600
Residential | Real estate    
Loans and leases    
Loans and leases 3,543,964 3,527,101
Home Equity Line    
Loans and leases    
Loans and leases 907,829 912,517
Home Equity Line | Real estate    
Loans and leases    
Loans and leases 907,829 912,517
Consumer    
Loans and leases    
Loans and leases 1,653,109 1,662,504
Lease Financing    
Loans and leases    
Loans and leases $ 145,987 $ 147,769