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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, 2022
Dec. 31, 2021
Dec. 31, 2020
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 $ (728) $ (322) $ 315
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships      
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - excluded component $ (64) $ (64)  
Derivative, Excluded Component, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and Dividend Income, Operating Interest and Dividend Income, Operating  
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 $ 212 $ 543  
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships      
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 212 543  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component $ 276 607  
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)  
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships      
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income   (23)  
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)