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Goodwill and Other Intangible Assets (Gross Carrying Amount Accumulated Amortization and Net Book Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]    
Gross carrying amount $ 16,587 $ 15,925
Accumulated amortization (8,999) (8,198)
Net book value $ 7,588 $ 7,727