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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on the Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss)    
Total amounts of income and expense line items presented in the statements of income and comprehensive income in which the effects of fair value or cash flow hedges are recorded $ 687  
Interest income    
Derivative Instruments, Gain (Loss)    
Total amounts of income and expense line items presented in the statements of income and comprehensive income in which the effects of fair value or cash flow hedges are recorded 26  
Total amounts of income and expense line items presented in the statements of income and comprehensive income 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 26 (3)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component 42 13
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component $ (16) $ 16