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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 356,500 $ 298,667
Total Recorded Investment 270,631 259,330
Recorded Investment No Allowance 147,095 166,270
Recorded Investment With Allowance 123,536 93,060
Related Valuation Allowance 20,366 15,350
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 148,932 120,165
Total Recorded Investment 108,256 99,287
Recorded Investment No Allowance 36,250 65,724
Recorded Investment With Allowance 72,006 33,563
Related Valuation Allowance 14,550 7,818
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 9,490 550
Total Recorded Investment 9,162 225
Recorded Investment No Allowance 9,013 0
Recorded Investment With Allowance 149 225
Related Valuation Allowance 5 6
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 19,270 13,355
Total Recorded Investment 13,256 10,828
Recorded Investment No Allowance 7,202 2,125
Recorded Investment With Allowance 6,054 8,703
Related Valuation Allowance 735 1,661
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 2,969  
Total Recorded Investment 2,968  
Recorded Investment No Allowance 2,968  
Recorded Investment With Allowance 0  
Related Valuation Allowance 0  
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 5,540 6,368
Total Recorded Investment 5,487 6,315
Recorded Investment No Allowance 2,403 2,946
Recorded Investment With Allowance 3,084 3,369
Related Valuation Allowance 177 196
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 105,576 113,575
Total Recorded Investment 95,666 103,531
Recorded Investment No Allowance 61,236 64,899
Recorded Investment With Allowance 34,430 38,632
Related Valuation Allowance 3,625 4,286
Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   44,654
Total Recorded Investment   39,144
Recorded Investment No Allowance   30,576
Recorded Investment With Allowance   8,568
Related Valuation Allowance   $ 1,383
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 64,723  
Total Recorded Investment 35,836  
Recorded Investment No Allowance 28,023  
Recorded Investment With Allowance 7,813  
Related Valuation Allowance $ 1,274