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Loans and Leases (Impaired Loans And Leases By Class) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 298,688 $ 273,364
Total Recorded Investment 273,345 249,355
Recorded Investment No Allowance 94,125 96,795
Recorded Investment With Allowance 179,220 152,560
Related Valuation Allowance 18,236 18,593
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 129,421 131,468
Total Recorded Investment 117,820 119,424
Recorded Investment No Allowance 27,130 21,068
Recorded Investment With Allowance 90,690 98,356
Related Valuation Allowance 5,105 8,090
Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 52,666 52,432
Total Recorded Investment 47,310 45,719
Recorded Investment No Allowance 22,923 22,746
Recorded Investment With Allowance 24,387 22,973
Related Valuation Allowance 1,829 2,903
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 90,351 57,732
Total Recorded Investment 83,206 53,037
Recorded Investment No Allowance 25,250 26,006
Recorded Investment With Allowance 57,956 27,031
Related Valuation Allowance 10,951 7,422
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 19,273 24,146
Total Recorded Investment 18,135 23,568
Recorded Investment No Allowance 13,086 19,591
Recorded Investment With Allowance 5,049 3,977
Related Valuation Allowance 239 169
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 645 1,188
Total Recorded Investment 542 1,187
Recorded Investment No Allowance 0 1,187
Recorded Investment With Allowance 542 0
Related Valuation Allowance 85 0
Finance Leases Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 6,332 6,398
Total Recorded Investment 6,332 6,420
Recorded Investment No Allowance 5,736 6,197
Recorded Investment With Allowance 596 223
Related Valuation Allowance $ 27 $ 9