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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loans and leases      
Loans and leases $ 13,211,650 $ 13,076,191 $ 12,277,369
Outstanding loan balances, deferred loan costs and fees 41,000 36,300  
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,900,000 2,500,000  
Consumer and commercial and industrial loans pledged to collateralize the borrowing capacity at the FRB 953,200 957,000  
Commercial and Industrial      
Loans and leases      
Loans and leases 2,743,242 3,208,760 3,135,266
Commercial real estate      
Loans and leases      
Loans and leases 3,463,953 2,990,783 2,667,597
Commercial real estate | Real estate      
Loans and leases      
Loans and leases 3,463,953 2,990,783  
Construction      
Loans and leases      
Loans and leases 519,241 626,757 632,911
Construction | Real estate      
Loans and leases      
Loans and leases 519,241 626,757  
Residential      
Loans and leases      
Loans and leases 4,662,175 4,439,618 4,090,053
Real estate loans in the process of foreclosure 4,100 4,600  
Residential | Real estate      
Loans and leases      
Loans and leases 4,662,175 4,439,618  
Consumer      
Loans and leases      
Loans and leases 1,620,556 1,662,504 1,586,476
Lease financing      
Loans and leases      
Loans and leases 202,483 147,769 $ 165,066
Residential mortgage | Residential      
Loans and leases      
Loans and leases 3,768,936 3,527,101  
Residential mortgage | Residential | Real estate      
Loans and leases      
Loans and leases 3,768,936 3,527,101  
Home equity | Home equity Line      
Loans and leases      
Loans and leases 893,239 912,517  
Home equity | Home equity Line | Real estate      
Loans and leases      
Loans and leases $ 893,239 $ 912,517