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Derivatives and hedging activities - Offsetting Derivatives (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 18,191 $ 5,672
Net Amounts of Assets presented in the Balance Sheet 18,191 5,672
Net Amount 18,191 5,672
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 16,935 4,680
Net Amounts of Assets presented in the Balance Sheet 16,935 4,680
Net Amount $ 16,935 $ 4,680