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Goodwill and Other Identifiable Intangible Assets - Schedule of Annual Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 1,234  
2020 1,132  
2021 844  
2022 545  
Net amount $ 3,755 $ 4,717