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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 453,484  
Amortized Cost 323,156 $ 256,410
Amortized Cost No Allowance 189,626  
Amortized Cost With Allowance 133,530  
Related Valuation Allowance 19,755  
Commercial Portfolio Segment [Member] | Commercial non-mortgage    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 174,593 140,096
Amortized Cost 129,552 102,254
Amortized Cost No Allowance 64,967 29,739
Amortized Cost With Allowance 64,585 72,515
Related Valuation Allowance 12,080 7,862
Commercial Portfolio Segment [Member] | Asset-based    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 464 465
Amortized Cost 138 139
Amortized Cost No Allowance 0 0
Amortized Cost With Allowance 138 139
Related Valuation Allowance 3 5
Commercial Portfolio Segment [Member] | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 33,694 29,292
Amortized Cost 27,526 23,297
Amortized Cost No Allowance 13,838 14,818
Amortized Cost With Allowance 13,688 8,479
Related Valuation Allowance 3,061 1,143
Commercial Portfolio Segment [Member] | Equipment financing    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 7,233 5,591
Amortized Cost 7,794 5,433
Amortized Cost No Allowance 3,881 2,159
Amortized Cost With Allowance 3,913 3,274
Related Valuation Allowance 127 418
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 120,304  
Amortized Cost 106,772 90,096
Amortized Cost No Allowance 68,597  
Amortized Cost With Allowance 38,175  
Related Valuation Allowance 3,304  
Consumer Portfolio Segment [Member] | Home equity    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 114,326 38,503
Amortized Cost 50,157 35,191
Amortized Cost No Allowance 38,277 27,672
Amortized Cost With Allowance 11,880 7,519
Related Valuation Allowance 1,022 1,203
Consumer Portfolio Segment [Member] | Consumer Loan    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,870 0
Amortized Cost 1,217 0
Amortized Cost No Allowance 66 0
Amortized Cost With Allowance 1,151 0
Related Valuation Allowance $ 158 $ 0