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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in OCI Included Component	$ 315	$ 441	$ 246
Amount of Gain (Loss) Recognized in OCI Included Component	1,002	687
Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(40)
Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	134	26
Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	53
Amount of Gain (Loss) Recognized in OCI Included Component	54
Amount of Loss Recognized in OCI Excluded Component	(1)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	94
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	110
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component	(16)
Cash Flow Hedge | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	71
Amount of Gain (Loss) Recognized in OCI Included Component	71
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	(40)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	(40)
Cash Flow Hedge | Interest Rate Floor | Interest income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivative	(18)	192
Amount of Gain Recognized in OCI Included Component		196
Amount of Gain (Loss) Recognized in OCI Included Component	(17)
Amount of Loss Recognized in OCI Excluded Component	(1)	(4)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	134	26
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		42
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component	150
Amount of Gain (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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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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