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Loans and Leases (Detail) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 21,802,517,000 $ 20,036,986,000 $ 19,269,883,000
Unamortized premiums (16,500,000) 17,600,000  
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral 8,000,000,000.0    
Interest receivable 55,500,000 59,000,000.0  
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 14,754,083,000 12,830,177,000 12,249,888,000
Commercial Portfolio Segment [Member] | Commercial non-mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 7,014,407,000 5,296,611,000  
Commercial Portfolio Segment [Member] | Asset-based      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 940,524,000 1,046,886,000  
Commercial Portfolio Segment [Member] | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,207,314,000 5,949,339,000  
Commercial Portfolio Segment [Member] | Equipment financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 591,838,000 537,341,000  
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 7,048,434,000 7,206,809,000 $ 7,019,995,000
Consumer Portfolio Segment [Member] | Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 4,921,573,000 4,972,685,000  
Consumer Portfolio Segment [Member] | Home equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 1,924,013,000 2,014,544,000  
Consumer Portfolio Segment [Member] | Other consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 202,848,000 $ 219,580,000