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Goodwill and other intangible assets - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Goodwill and other intangible assets          
Amortization Of Intangible Assets $ 1,255,000 $ 1,796,000 $ 2,306,000 $ 4,269,000  
Identifiable intangible assets 6,100,000   6,100,000   $ 6,100,000
Changes in the carrying amount of goodwill $ 0 $ 0 $ 0 $ 0