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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Loans and leases    
Loans and leases $ 14,129,383 $ 14,408,258
Outstanding loan balances, deferred loan costs and fees 54,400 53,200
Accrued interest receivable related to loans and leases recorded separately 66,200 67,700
Asset Pledged as Collateral    
Loans and leases    
Assets pledged as collateral 10,820,499 10,294,047
Commercial and industrial    
Loans and leases    
Loans and leases 2,027,504 2,247,428
Commercial real estate    
Loans and leases    
Loans and leases 4,513,706 4,463,992
Residential mortgage    
Loans and leases    
Loans and leases 5,248,768  
Residential mortgage | Residential real estate    
Loans and leases    
Loans and leases 4,077,946 4,168,154
Residential mortgage | Asset Pledged as Collateral    
Loans and leases    
Properties in the process of foreclosure 4,600 5,900
Consumer    
Loans and leases    
Loans and leases 1,013,663 1,023,969
Lease financing    
Loans and leases    
Loans and leases 444,280 434,650
Residential real estate loans and commercial real estate loans | Asset Pledged as Collateral | FHLB    
Loans and leases    
Assets pledged as collateral 4,900,000 5,000,000
Consumer, commercial and industrial, commercial real estate, residential real estate loans and pledged securities | Asset Pledged as Collateral | FRB    
Loans and leases    
Assets pledged as collateral 4,000,000 3,600,000
Real estate    
Loans and leases    
Loans and leases 5,248,768 5,319,893
Real estate | Commercial and industrial    
Loans and leases    
Loans and leases 2,027,504 2,247,428
Real estate | Commercial real estate    
Loans and leases    
Loans and leases 4,513,706 4,463,992
Real estate | Construction    
Loans and leases    
Loans and leases 881,462 918,326
Real estate | Home equity line    
Loans and leases    
Loans and leases 1,170,822 1,151,739
Real estate | Consumer    
Loans and leases    
Loans and leases $ 1,013,663 $ 1,023,969