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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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI Included Component		$ 246
Amount of Gain Recognized in OCI Included Component	$ 441
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	26	(3)
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	192	243
Amount of Gain Recognized in OCI Included Component		109
Amount of Gain Recognized in OCI Included Component	196
Amount of Gain Recognized in OCI Excluded Component	(4)	134
Amount of Loss Reclassified from Accumulated OCI into Income	26	(3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		13
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	42
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	$ (16)	$ (16)

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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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