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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 301,412 $ 298,667
Total Recorded Investment 253,247 259,330
Recorded Investment No Allowance 162,679 166,270
Recorded Investment With Allowance 90,568 93,060
Related Valuation Allowance 14,781 15,350
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 109,366 113,575
Total Recorded Investment 100,168 103,531
Recorded Investment No Allowance 64,494 64,899
Recorded Investment With Allowance 35,674 38,632
Related Valuation Allowance 3,969 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 40,761  
Total Recorded Investment 37,332  
Recorded Investment No Allowance 29,295  
Recorded Investment With Allowance 8,037  
Related Valuation Allowance 1,292  
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 127,092 120,165
Total Recorded Investment 97,735 99,287
Recorded Investment No Allowance 61,199 65,724
Recorded Investment With Allowance 36,536 33,563
Related Valuation Allowance 8,691 7,818
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 510 550
Total Recorded Investment 184 225
Recorded Investment No Allowance 0 0
Recorded Investment With Allowance 184 225
Related Valuation Allowance 5 6
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 19,734 13,355
Total Recorded Investment 13,879 10,828
Recorded Investment No Allowance 6,920 2,125
Recorded Investment With Allowance 6,959 8,703
Related Valuation Allowance 656 1,661
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,949 6,368
Total Recorded Investment 3,949 6,315
Recorded Investment No Allowance 771 2,946
Recorded Investment With Allowance 3,178 3,369
Related Valuation Allowance $ 168 $ 196