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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 421,885  
Amortized Cost 307,907 $ 256,410
Amortized Cost No Allowance 144,239  
Amortized Cost With Allowance 163,668  
Related Valuation Allowance 22,679  
Commercial Portfolio Segment [Member] | Commercial non-mortgage    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 160,667 140,096
Amortized Cost 125,799 102,254
Amortized Cost No Allowance 28,937 29,739
Amortized Cost With Allowance 96,862 72,515
Related Valuation Allowance 15,833 7,862
Commercial Portfolio Segment [Member] | Asset-based    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 4,114 465
Amortized Cost 3,760 139
Amortized Cost No Allowance 0 0
Amortized Cost With Allowance 3,760 139
Related Valuation Allowance 459 5
Commercial Portfolio Segment [Member] | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 24,865 29,292
Amortized Cost 21,583 23,297
Amortized Cost No Allowance 12,679 14,818
Amortized Cost With Allowance 8,904 8,479
Related Valuation Allowance 1,613 1,143
Commercial Portfolio Segment [Member] | Equipment financing    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 7,661 5,591
Amortized Cost 7,182 5,433
Amortized Cost No Allowance 2,659 2,159
Amortized Cost With Allowance 4,523 3,274
Related Valuation Allowance 398 418
Commercial Portfolio Segment [Member] | Residential    
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    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 110,542  
Amortized Cost 100,443 90,096
Amortized Cost No Allowance 63,457  
Amortized Cost With Allowance 36,986  
Related Valuation Allowance 3,293  
Consumer Portfolio Segment [Member] | Home equity    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 111,715 38,503
Amortized Cost 48,461 35,191
Amortized Cost No Allowance 36,477 27,672
Amortized Cost With Allowance 11,984 7,519
Related Valuation Allowance 1,012 1,203
Consumer Portfolio Segment [Member] | Consumer Loan    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,321 0
Amortized Cost 679 0
Amortized Cost No Allowance 30 0
Amortized Cost With Allowance 649 0
Related Valuation Allowance $ 71 $ 0