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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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- 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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