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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, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI Included Component	$ 1,244		$ 1,002
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(23)
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	134	$ 36
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	325
Amount of Gain (Loss) Recognized in OCI Included Component	316
Amount of Loss Recognized in OCI Excluded Component	9
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	85
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	126
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component	(41)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	401
Amount of Gain (Loss) Recognized in OCI Included Component	401
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(48)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	(23)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded 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)	(1,072)
Amount of Gain (Loss) Recognized in OCI Included Component	(85)	(1,104)
Amount of Loss Recognized in OCI Excluded Component	9	36
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	133	36
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	149	52
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component	$ (16)	$ (16)

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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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The 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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