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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI Included Component	$ (2,017)		$ (47)
Interest income
Derivative Instruments, Gain (Loss)
Amount of Gain Reclassified from Accumulated OCI into Income	(16)	$ 131
Cash Flow Hedge
Derivative Instruments, Gain (Loss)
Amount of (Loss) Recognized in OCI on Derivative	1	(361)
Amount of Gain (Loss) Recognized in OCI Included Component		(439)
Amount of (Loss) Recognized in OCI Excluded Component	1	78
Amount of Gain Reclassified from Accumulated OCI into Income	(16)	131
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component		147
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component	16	(16)
Cash Flow Hedge | Interest rate products | Interest income
Derivative Instruments, Gain (Loss)
Amount of (Loss) Recognized in OCI on Derivative	1	(361)
Amount of Gain (Loss) Recognized in OCI Included Component		(439)
Amount of (Loss) Recognized in OCI Excluded Component	1	78
Amount of Gain Reclassified from Accumulated OCI into Income	(16)	131
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component		147
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component	$ 16	$ (16)

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge excluded in assessment of hedge effectiveness.

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The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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