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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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- 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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