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Loans and Leases (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases $ 21,641,215,000 $ 20,036,986,000 $ 18,465,489,000
Unamortized premiums (10,500,000) 17,600,000  
Pledged loans as collateral 7,700,000,000    
Lessee, Operating Lease, Liability, Payments, Due 182,452,000    
Interest Receivable 57,800,000 59,000,000.0  
Leasing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 236,100,000 169,300,000  
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 14,900,535,000 12,830,177,000 11,652,148,000
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 6,322,637,000 5,949,339,000  
Commercial Portfolio Segment [Member] | Equipment Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 602,224,000 537,341,000  
Sales-type and Direct Financing Leases, Interest Income 7,100,000 5,500,000  
Commercial Portfolio Segment [Member] | Non-Real Estate Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 7,085,076,000 5,296,611,000  
Commercial Portfolio Segment [Member] | Asset Based Lending [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 890,598,000 1,046,886,000  
Commercial Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases   5,949,339,000  
Finance Leases Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases   537,341,000  
Lessee, Operating Lease, Liability, Payments, Due 256,300,000    
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 6,740,680,000 7,206,809,000 $ 6,813,341,000
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 1,802,865,000 2,014,544,000  
Consumer Portfolio Segment [Member] | 522291 Consumer Lending [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 155,799,000 219,580,000  
Consumer Portfolio Segment [Member] | Residential Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases $ 4,782,016,000 $ 4,972,685,000