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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	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI Included Component	$ 1,180		$ 687
Amount of Loss Reclassified from Accumulated OCI into Income		$ (31)
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	73
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	110
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	(360)
Amount of Gain Recognized in OCI Included Component	(359)
Amount of Gain Recognized in OCI Excluded Component	(1)
Amount of Loss Reclassified from Accumulated OCI into Income	183
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	199
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	(16)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	(510)
Amount of Gain Recognized in OCI Included Component	(510)
Amount of Loss Reclassified from Accumulated OCI into Income	73
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	73
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	150	474
Amount of Gain Recognized in OCI Included Component	151	827
Amount of Gain Recognized in OCI Excluded Component	(1)	(353)
Amount of Loss Reclassified from Accumulated OCI into Income	110	(31)
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	126
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	$ (16)	$ (31)

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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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