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Goodwill and Other Intangible Assets (Estimated Aggregate Future Amortization Expense for Intangible Assets) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 1,167  
2020 919  
2021 697  
2022 481  
2023 283  
Thereafter 102  
Net Intangible Assets $ 3,649 $ 5,073