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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 274,736 $ 273,364
Total Recorded Investment 246,753 249,355
Recorded Investment No Allowance 141,398 96,795
Recorded Investment With Allowance 105,355 152,560
Related Valuation Allowance 16,554 18,593
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 125,352 131,468
Total Recorded Investment 114,295 119,424
Recorded Investment No Allowance 69,759 21,068
Recorded Investment With Allowance 44,536 98,356
Related Valuation Allowance 4,805 8,090
Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   52,432
Total Recorded Investment   45,719
Recorded Investment No Allowance   22,746
Recorded Investment With Allowance   22,973
Related Valuation Allowance   2,903
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 50,809  
Total Recorded Investment 45,436  
Recorded Investment No Allowance 34,418  
Recorded Investment With Allowance 11,018  
Related Valuation Allowance 1,668  
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 79,900 57,732
Total Recorded Investment 71,882 53,037
Recorded Investment No Allowance 27,313 26,006
Recorded Investment With Allowance 44,569 27,031
Related Valuation Allowance 9,786 7,422
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,272 0
Total Recorded Investment 589 0
Recorded Investment No Allowance 589 0
Recorded Investment With Allowance 0 0
Related Valuation Allowance 0 0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 0 1,188
Total Recorded Investment 0 1,187
Recorded Investment No Allowance 0 1,187
Recorded Investment With Allowance 0 0
Related Valuation Allowance 0 0
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 11,994 24,146
Total Recorded Investment 11,226 23,568
Recorded Investment No Allowance 6,387 19,591
Recorded Investment With Allowance 4,839 3,977
Related Valuation Allowance 272 169
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,409 6,398
Total Recorded Investment 3,325 6,420
Recorded Investment No Allowance 2,932 6,197
Recorded Investment With Allowance 393 223
Related Valuation Allowance $ 23 $ 9