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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in OCI Included Component | $ 1,043 |  | $ 687
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income |  | $ (48) |
Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income | (20) |  |
Interest income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income | 133 |  |
Cash Flow Hedge |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative | (23) |  |
Amount of Gain (Loss) Recognized in OCI Included Component | (3) |  |
Amount of Loss Recognized in OCI Excluded Component | (20) |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income | 113 |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component | 129 |  |
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 | 2 |  |
Amount of Gain (Loss) Recognized in OCI Included Component | 2 |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income | (20) |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component | (20) |  |
Cash Flow Hedge | Interest Rate Floor | Interest income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivative | (25) | 138 |
Amount of Gain (Loss) Recognized in OCI Included Component | (5) | 186 |
Amount of Loss Recognized in OCI Excluded Component | (20) | (48) |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income | 133 | (16) |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Included Component | 149 |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income Excluded Component | $ (16) | $ (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 No definition available. + Details
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