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Derivatives and hedging activities - Offsetting Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 17,930 $ 5,672
Net Amounts of Assets presented in the Balance Sheet 17,930 5,672
Net Amount 17,930 5,672
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 16,515 4,680
Net Amounts of Assets presented in the Balance Sheet 16,515 4,680
Net Amount $ 16,515 $ 4,680