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Loans and Leases (Detail) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 21,852,023,000 $ 20,036,986,000 $ 19,551,646,000
Unamortized premiums (14,100,000) 17,600,000  
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral 7,900,000,000    
Interest receivable 56,600,000 59,000,000.0  
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 14,920,116,000 12,830,177,000 12,407,968,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 7,124,365,000 5,296,611,000  
Commercial Portfolio Segment [Member] | Asset-based      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 889,711,000 1,046,886,000  
Commercial Portfolio Segment [Member] | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,307,567,000 5,949,339,000  
Commercial Portfolio Segment [Member] | Equipment financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 598,473,000 537,341,000  
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,931,907,000 7,206,809,000 $ 7,143,678,000
Consumer Portfolio Segment [Member] | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 4,885,821,000 4,972,685,000  
Consumer Portfolio Segment [Member] | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 1,867,969,000 2,014,544,000  
Consumer Portfolio Segment [Member] | Other consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 178,117,000 $ 219,580,000