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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on the Income Statement (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Derivative Instruments, Gain (Loss)  
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded $ 246
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income (3)
Interest income  
Derivative Instruments, Gain (Loss)  
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded (3)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income (3)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component 13
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component $ (16)