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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 316,542 $ 366,129
Total Recorded Investment 279,171 330,856 [1]
Recorded Investment No Allowance 95,225 113,011
Recorded Investment With Allowance 183,946 217,845
Related Valuation Allowance 22,204 25,301
Interest Receivable 43,100 38,400
Impaired Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Interest Receivable 1,700 1,400
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 148,144 157,152
Total Recorded Investment 134,448 141,982 [1]
Recorded Investment No Allowance 23,024 24,335
Recorded Investment With Allowance 111,424 117,647
Related Valuation Allowance 10,364 12,094
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 56,680 60,424
Total Recorded Investment 48,425 50,249 [1]
Recorded Investment No Allowance 25,130 26,432
Recorded Investment With Allowance 23,295 23,817
Related Valuation Allowance 3,477 4,237
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 7,010 7,218
Total Recorded Investment 5,962 6,161 [1]
Recorded Investment No Allowance 5,939 5,940
Recorded Investment With Allowance 23 221
Related Valuation Allowance 3 10
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 612 629
Total Recorded Investment 422 632 [1]
Recorded Investment No Allowance 328 0
Recorded Investment With Allowance 94 632
Related Valuation Allowance 3 28
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 67,116 41,019
Total Recorded Investment 56,581 36,176 [1]
Recorded Investment No Allowance 31,600 15,998
Recorded Investment With Allowance 24,981 20,178
Related Valuation Allowance 5,197 2,710
Commercial Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 36,980 99,687
Total Recorded Investment 33,333 95,656 [1]
Recorded Investment No Allowance 9,204 40,306
Recorded Investment With Allowance 24,129 55,350
Related Valuation Allowance $ 3,160 $ 6,222
[1] Total recorded investment of impaired loans and leases exclude $1.7 million and $1.4 million of accrued interest receivable at December 31, 2015 and December 31, 2014, respectively.