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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on the Income Statement and Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments, Gain (Loss)        
Total amounts of income and expense line items presented in the statements of income and comprehensive income (loss) in which the effects of fair value or cash flow hedges are recorded $ 747 $ (46) $ 826 $ (740)
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) (48) (48)
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 (loss) in which the effects of fair value or cash flow hedges are recorded $ 188 $ 4 318 228
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships        
Hedged items (731)   (779)  
Derivatives designated as hedging instruments 935   1,145  
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income $ (16) 4 $ (48) 228
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income - included component   $ 20   $ 276