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Derivatives and hedging activities - Offsetting Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 4,833 $ 661
Net Amounts of Assets presented in the Balance Sheet 4,833 661
Net Amount 4,833 661
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 4,183 138
Net Amounts of Assets presented in the Balance Sheet 4,183 138
Net Amount $ 4,183 $ 138