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Loans and Leases (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 21,475,001 $ 21,641,215 $ 21,802,517
Unamortized premiums (13,500) (10,500)  
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral 7,300,000    
Interest receivable 54,600 57,800  
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 14,828,391 14,900,535 14,754,083
Commercial Portfolio Segment [Member] | Commercial non-mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,843,415 7,085,076  
Commercial Portfolio Segment [Member] | Asset-based      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 943,961 890,598  
Commercial Portfolio Segment [Member] | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,410,672 6,322,637  
Commercial Portfolio Segment [Member] | Equipment financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 630,343 602,224  
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,646,610 6,740,680 $ 7,048,434
Consumer Portfolio Segment [Member] | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 4,856,302 4,782,016  
Consumer Portfolio Segment [Member] | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 1,677,136 1,802,865  
Consumer Portfolio Segment [Member] | Other consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 113,172 $ 155,799