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Goodwill and Other Intangible Assets (Gross Carrying Amount Accumulated Amortization and Net Book Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Gross carrying amount $ 15,925 $ 15,925
Accumulated amortization (7,925) (7,064)
Net book value $ 8,000 $ 8,861