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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 464,990  
Amortized Cost 332,117 $ 256,410
Amortized Cost No Allowance 173,739  
Amortized Cost With Allowance 158,378  
Related Valuation Allowance 13,012  
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 188,458 140,096
Amortized Cost 143,415 102,254
Amortized Cost No Allowance 53,032 29,739
Amortized Cost With Allowance 90,383 72,515
Related Valuation Allowance 6,527 7,862
Commercial Portfolio Segment [Member] | Asset Based Lending    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 463 465
Amortized Cost 137 139
Amortized Cost No Allowance 0 0
Amortized Cost With Allowance 137 139
Related Valuation Allowance 3 5
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 30,540 29,292
Amortized Cost 24,509 23,297
Amortized Cost No Allowance 15,699 14,818
Amortized Cost With Allowance 8,810 8,479
Related Valuation Allowance 1,044 1,143
Commercial Portfolio Segment [Member] | 6172 Finance Lessors    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 9,063 5,591
Amortized Cost 8,951 5,433
Amortized Cost No Allowance 549 2,159
Amortized Cost With Allowance 8,402 3,274
Related Valuation Allowance 661 418
Commercial Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   98,790
Amortized Cost   90,096
Amortized Cost No Allowance   56,231
Amortized Cost With Allowance   33,865
Related Valuation Allowance   3,618
Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   312,737
Amortized Cost   256,410
Amortized Cost No Allowance   130,619
Amortized Cost With Allowance   125,791
Related Valuation Allowance   14,249
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 119,579  
Amortized Cost 105,460 90,096
Amortized Cost No Allowance 68,788  
Amortized Cost With Allowance 36,672  
Related Valuation Allowance 3,438  
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 114,212 38,503
Amortized Cost 48,612 35,191
Amortized Cost No Allowance 35,606 27,672
Amortized Cost With Allowance 13,006 7,519
Related Valuation Allowance 1,137 1,203
Consumer Portfolio Segment [Member] | Consumer Loan    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,675 0
Amortized Cost 1,033 0
Amortized Cost No Allowance 65 0
Amortized Cost With Allowance 968 0
Related Valuation Allowance $ 202 $ 0