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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, 2021
Dec. 31, 2020
Dec. 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 $ (322) $ 315 $ 441
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component (322) 315 $ 441
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 543 413  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 543 413  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component 607 477  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component (64) (64)  
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 (48) 13  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income (23) 13  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income as a result that a forecasted transaction is no longer probable of occurring (25)    
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component $ (48) $ 13