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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		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI Included Component			$ 980		$ 1,002
Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income		$ (20)	(23)	$ 53
Interest income
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	$ 137	$ 133	405	279
Cash Flow Hedge
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI on Derivative			335	(468)
Amount of Gain (Loss) Recognized in OCI Included Component			331	(446)
Amount of Loss Recognized in OCI Excluded Component			4	(22)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income			357	332
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component			405	380
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component			(48)	(48)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in OCI on Derivative			401	(592)
Amount of Gain (Loss) Recognized in OCI Included Component			401	(592)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income			(23)	53
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component			(23)	53
Cash Flow Hedge | Other expense
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			(66)	124
Amount of Gain (Loss) Recognized in OCI Included Component			(70)	146
Amount of Loss Recognized in OCI Excluded Component			4	(22)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income			405	279
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component			453	327
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component			$ (48)	$ (48)

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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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