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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		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI Included Component			$ 1,108		$ 1,002
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income		$ 73	(23)	$ 73
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	$ 134	$ 110	268	146
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative			325	(360)
Amount of Gain (Loss) Recognized in OCI Included Component			318	(359)
Amount of Loss Recognized in OCI Excluded Component			7	(1)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income			220	219
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component			252	251
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component			(32)	(32)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative			401	(510)
Amount of Gain (Loss) Recognized in OCI Included Component			401	(510)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income			(23)	73
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component			(23)	73
Cash Flow Hedge | Other expense
Derivative Instruments, Gain (Loss) [Line Items]
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) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative			(76)	150
Amount of Gain (Loss) Recognized in OCI Included Component			(83)	151
Amount of Loss Recognized in OCI Excluded Component			7	(1)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income			268	146
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component			300	178
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component			$ (32)	$ (32)

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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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