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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) - Interest income - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income		$ (48)
Cash Flow Hedge | Interest Rate Floor
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	$ 138	611
Amount of Gain Recognized in OCI Included Component	186	1,013
Amount of Gain Recognized in OCI Excluded Component	(48)	(402)
Amount of Loss Reclassified from Accumulated OCI into Income	(16)	(48)
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	$ (16)	$ (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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