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Derivatives and hedging activities - Offsetting Derivatives (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 11,542 $ 15,371
Net Amounts of Assets presented in the Balance Sheet 11,542 15,371
Net Amount 11,542 15,371
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 9,603 14,099
Net Amounts of Assets presented in the Balance Sheet 9,603 14,099
Net Amount $ 9,603 $ 14,099