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Goodwill and Other Intangible Assets (Estimated Aggregate Future Amortization Expense for Intangible Assets) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 1,703  
2018 1,424  
2019 1,167  
2020 918  
2021 697  
Thereafter 867  
Net Intangible Assets $ 6,776 $ 8,800