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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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.	$ (824)	$ (728)	$ (322)
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships
Amount of (loss) reclassified from AOCI into income - Excluded Component	$ (48)	$ (64)
Derivative, Excluded Component, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Income (Expense), Net	Interest Income (Expense), Net
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.	$ 142	$ 212
The effects of fair value and cash flow hedging: Gain or (loss) on cash flow hedging relationships
Hedged items	871
Derivatives designated as hedging instruments	(681)
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income	$ (48)	212
Amount of gain reclassified from AOCI into income - Included Component		$ 276