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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, 2020
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 $ 315 $ 441 $ 246
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 134 26  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 134 26  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component 150 42  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component (16) $ 16  
Interest expense      
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 (40)    
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income $ (40)