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Derivative instruments and hedging activities - Derivative instruments and hedging activities- Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative      
Fair Value Hedges, Net $ 0 $ 0  
Amount of net gain (loss) recognized in income on derivatives 2,313,000 (2,982,000) $ (1,244,000)
Derivative liabilities credit risk gain losses $ (300,000) $ 700,000 $ 200,000
Derivative remaining maturity days 76 days    
Counterparty credit risk      
Derivative      
Derivative liabilities credit risk gain losses $ (100,000)