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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and leases      
Loans and leases $ 11,520,378 $ 10,722,030 $ 10,023,590
Unearned income, including net deferred loan costs 23,800 17,200  
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,100,000 2,500,000  
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 935,700 814,200  
Real estate      
Loans and leases      
Loans and leases 6,589,966 6,064,335  
Commercial and Industrial      
Loans and leases      
Loans and leases 3,239,600 3,057,455 2,697,142
Commercial Real Estate      
Loans and leases      
Loans and leases 2,343,495 2,164,448 2,047,465
Commercial Real Estate | Real estate      
Loans and leases      
Loans and leases 2,343,495 2,164,448  
Construction      
Loans and leases      
Loans and leases 450,012 367,460 470,061
Construction | Real estate      
Loans and leases      
Loans and leases 450,012 367,460  
Residential      
Loans and leases      
Loans and leases 3,796,459 3,532,427 3,338,021
Real estate loans in the process of foreclosure 4,100 11,300  
Residential | Real estate      
Loans and leases      
Loans and leases 3,796,459 3,532,427  
Consumer      
Loans and leases      
Loans and leases 1,510,772 1,401,561 1,226,603
Lease Financing      
Loans and leases      
Loans and leases $ 180,040 $ 198,679 $ 244,298