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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
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
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 $ 1,036 $ 63
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 36 (15)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 36 (15)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component 52  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component $ (16) $ (15)