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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, 2023
Mar. 31, 2022
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 $ (1,970) $ (493)
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 $ (16) $ (16)
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 $ 15 $ 131
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships    
Hedged items 1,986  
Derivatives designated as hedging instruments (1,955)  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income $ (16) 131
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component   $ 147