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Goodwill and Other Intangible Assets - Amortization (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Other Intangible Assets        
Amortization of intangible assets $ 79,000 $ 83,000 $ 236,000 $ 248,000