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Derivatives and hedging activities - Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	$ 243
Amount of Gain Recognized in OCI Included Component	109
Amount of Gain Recognized in OCI Excluded Component	134
Amount of Loss Reclassified from Accumulated OCI into Income	(3)
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	13
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	(16)
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	(3)
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	243
Amount of Gain Recognized in OCI Included Component	109
Amount of Gain Recognized in OCI Excluded Component	134
Amount of Loss Reclassified from Accumulated OCI into Income	(3)
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	13
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	$ (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.

+ References

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The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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- Definition

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.

+ References

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