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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

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