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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 273,364 $ 316,542
Total Recorded Investment 249,355 279,171
Recorded Investment No Allowance 96,795 95,225
Recorded Investment With Allowance 152,560 183,946
Related Valuation Allowance 18,593 22,204
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 131,468 148,144
Total Recorded Investment 119,424 134,448
Recorded Investment No Allowance 21,068 23,024
Recorded Investment With Allowance 98,356 111,424
Related Valuation Allowance 8,090 10,364
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 52,432 56,680
Total Recorded Investment 45,719 48,425
Recorded Investment No Allowance 22,746 25,130
Recorded Investment With Allowance 22,973 23,295
Related Valuation Allowance 2,903 3,477
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,188 7,010
Total Recorded Investment 1,187 5,962
Recorded Investment No Allowance 1,187 5,939
Recorded Investment With Allowance 0 23
Related Valuation Allowance 0 3
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 6,398 612
Total Recorded Investment 6,420 422
Recorded Investment No Allowance 6,197 328
Recorded Investment With Allowance 223 94
Related Valuation Allowance 9 3
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 57,732 67,116
Total Recorded Investment 53,037 56,581
Recorded Investment No Allowance 26,006 31,600
Recorded Investment With Allowance 27,031 24,981
Related Valuation Allowance 7,422 5,197
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 24,146 36,980
Total Recorded Investment 23,568 33,333
Recorded Investment No Allowance 19,591 9,204
Recorded Investment With Allowance 3,977 24,129
Related Valuation Allowance $ 169 $ 3,160