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Loans and Leases (Detail) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 20,891,524,000 $ 20,036,986,000 $ 18,814,290,000
Unamortized premiums 19,700,000    
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral 7,700,000,000    
Interest Receivable 61,500,000 59,000,000.0  
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 13,688,421,000 12,830,177,000 11,842,767,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 5,838,673,000 5,296,611,000  
Commercial Portfolio Segment [Member] | Asset Based Lending      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 1,180,328,000 1,046,886,000  
Commercial Portfolio Segment [Member] | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 6,122,474,000 5,949,339,000  
Commercial Portfolio Segment [Member] | 6172 Finance Lessors      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 546,946,000 537,341,000  
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 7,203,103,000 7,206,809,000 $ 6,971,523,000
Consumer Portfolio Segment [Member] | Residential Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 4,991,512,000 4,972,685,000  
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 1,992,372,000 2,014,544,000  
Consumer Portfolio Segment [Member] | Consumer Lending      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 219,219,000 219,580,000  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 4,991,512,000 $ 4,972,685,000