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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans and leases      
Loans and leases $ 13,279,097 $ 13,211,650 $ 13,076,191
Outstanding loan balances, deferred loan costs and fees 26,100 41,000  
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,900,000 2,900,000  
Consumer, commercial and industrial, commercial real estate and residential mortgage loans pledged to collateralize the borrowing capacity at the FRB 1,900,000 953,200  
Real estate      
Loans and leases      
Loans and leases 4,531,842 4,662,175  
Commercial and Industrial      
Loans and leases      
Loans and leases 3,019,507 2,743,242 3,208,760
Commercial and Industrial | Real estate      
Loans and leases      
Loans and leases 3,019,507 2,743,242  
Commercial real estate      
Loans and leases      
Loans and leases 3,392,676 3,463,953 2,990,783
Commercial real estate | Real estate      
Loans and leases      
Loans and leases 3,392,676 3,463,953  
Construction      
Loans and leases      
Loans and leases 735,819 519,241 626,757
Construction | Real estate      
Loans and leases      
Loans and leases 735,819 519,241  
Residential      
Loans and leases      
Loans and leases 3,690,218 4,662,175 4,439,618
Properties in the process of foreclosure 2,300 4,100  
Residential | Real estate      
Loans and leases      
Loans and leases 3,690,218 3,768,936  
Home equity Line      
Loans and leases      
Loans and leases 841,624    
Home equity Line | Real estate      
Loans and leases      
Loans and leases 841,624 893,239  
Consumer      
Loans and leases      
Loans and leases 1,353,842 1,620,556 1,662,504
Consumer | Real estate      
Loans and leases      
Loans and leases 1,353,842 1,620,556  
Lease financing      
Loans and leases      
Loans and leases $ 245,411 202,483 $ 147,769
Residential mortgage | Residential      
Loans and leases      
Loans and leases   3,768,936  
Home equity | Home equity Line      
Loans and leases      
Loans and leases   $ 893,239