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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	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI Included Component	$ 1,043		$ 687
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income		$ (48)
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(20)
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	133
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	(23)
Amount of Gain (Loss) Recognized in OCI Included Component	(3)
Amount of Loss Recognized in OCI Excluded Component	(20)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	113
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	129
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component	(16)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	2
Amount of Gain (Loss) Recognized in OCI Included Component	2
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(20)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	(20)
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	(25)	138
Amount of Gain (Loss) Recognized in OCI Included Component	(5)	186
Amount of Loss Recognized in OCI Excluded Component	(20)	(48)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	133	(16)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	149
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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