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Loans and Leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases $ 20,036,986 $ 18,465,489 $ 17,523,858
Unamortized premiums 17,600 13,900  
Pledged loans as collateral 7,900,000    
Lessee, Operating Lease, Liability, Payments, Due 203,118    
Sales-type and Direct Financing Leases, Interest Income 5,500    
Leasing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 169,300    
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 6,343,497 6,216,606 5,368,694
Commercial Real Estate Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 5,949,339 4,927,145 4,523,828
Finance Leases Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 537,341 508,397 550,233
Lessee, Operating Lease, Liability, Payments, Due 184,100    
Residential Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases 4,972,685 4,416,637 4,490,878
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans and Leases $ 2,234,124 $ 2,396,704 $ 2,590,225