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Goodwill and other intangible assets - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Goodwill and other intangible assets      
Amortization Of Intangible Assets $ 891,000 $ 1,051,000  
Identifiable intangible assets 700,000   $ 700,000
Changes in the carrying amount of goodwill $ 0 $ 0