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Derivatives and hedging activities - Offsetting Derivatives (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Offsetting of Derivative Assets    
Gross Amounts of Recognized Assets $ 661 $ 655
Net Amounts of Assets presented in the Statement of Financial Position 661 655
Net Amount 661 655
Offsetting of Derivative Liabilities    
Gross Amounts of Recognized Liabilities 138 733
Net Amounts of Assets presented in the Statement of Financial Position 138 733
Net Amount $ 138 $ 733