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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and leases      
Loans and leases $ 12,277,369 $ 11,520,378 $ 10,722,030
Unearned income, including net deferred loan costs 31,200 23,800  
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,400,000 2,100,000  
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 914,500 935,700  
Real estate      
Loans and leases      
Loans and leases 7,390,561 6,589,966  
Commercial and Industrial      
Loans and leases      
Loans and leases 3,135,266 3,239,600 3,057,455
Commercial Real Estate      
Loans and leases      
Loans and leases 2,667,597 2,343,495 2,164,448
Commercial Real Estate | Real estate      
Loans and leases      
Loans and leases 2,667,597 2,343,495  
Construction      
Loans and leases      
Loans and leases 632,911 450,012 367,460
Construction | Real estate      
Loans and leases      
Loans and leases 632,911 450,012  
Residential      
Loans and leases      
Loans and leases 4,090,053 3,796,459 3,532,427
Real estate loans in the process of foreclosure 3,300 4,100  
Residential | Real estate      
Loans and leases      
Loans and leases 4,090,053 3,796,459  
Consumer      
Loans and leases      
Loans and leases 1,586,476 1,510,772 1,401,561
Lease Financing      
Loans and leases      
Loans and leases $ 165,066 $ 180,040 $ 198,679