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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 $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	$ (15)
Cash Flow Hedge | Interest Rate Floor
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	47
Amount of Gain Recognized in OCI Included Component	295
Amount of Gain Recognized in OCI Excluded Component	(248)
Amount of Loss Reclassified from Accumulated OCI into Income	(15)
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	$ (15)

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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.

+ References

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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.

+ References

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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.

+ References

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