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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	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI Included Component	$ 1,723		$ 687
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	36	$ (15)
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative	(1,072)	47
Amount of Gain Recognized in OCI Included Component	(1,104)	295
Amount of Gain Recognized in OCI Excluded Component	36	(248)
Amount of Loss Reclassified from Accumulated OCI into Income	36	(15)
Amount of Gain Reclassified from Accumulated OCI into Income Included Component	52
Amount of Loss Reclassified from Accumulated OCI into Income Excluded Component	$ (16)	$ (15)

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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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