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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and leases      
Loans and leases $ 11,396,555 $ 10,722,030 $ 10,023,590
Unearned income, including net deferred loan costs 21,900 17,200 13,900
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 5,855,547
Commercial and Industrial      
Loans and leases      
Loans and leases 3,265,291 3,057,455 2,697,142
Commercial Real Estate      
Loans and leases      
Loans and leases 2,311,874 2,164,448 2,047,465
Commercial Real Estate | Real estate      
Loans and leases      
Loans and leases 2,311,874 2,164,448 2,047,465
Construction      
Loans and leases      
Loans and leases 475,333 367,460 470,061
Construction | Real estate      
Loans and leases      
Loans and leases 475,333 367,460 470,061
Residential      
Loans and leases      
Loans and leases 3,687,660 3,532,427 3,338,021
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 3,338,021
Consumer      
Loans and leases      
Loans and leases 1,469,220 1,401,561 1,226,603
Lease Financing      
Loans and leases      
Loans and leases $ 187,177 $ 198,679 $ 244,298