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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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI Included Component	$ 680	$ 1,002
Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(23)	13
Interest income
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	543	413
Cash Flow Hedge
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI on Derivative	173	741
Amount of Gain (Loss) Recognized in OCI Included Component	156	795
Amount of Loss Recognized in OCI Excluded Component	17	(54)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	495	427
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	559	491
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component	(64)	(64)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI on Derivative	401	(437)
Amount of Gain (Loss) Recognized in OCI Included Component	401	(437)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(23)	13
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	(23)	13
Cash Flow Hedge | Other
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(25)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	(25)
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI on Derivative	(228)	1,178
Amount of Gain (Loss) Recognized in OCI Included Component	(245)	1,232
Amount of Loss Recognized in OCI Excluded Component	17	(54)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	543	414
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	607	478
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component	$ (64)	$ (64)

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- Definition

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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