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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, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) |  |  |
Amount of Gain (Loss) Recognized in OCI Included Component | $ 208 |  | $ (871)
Interest income |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of Gain Reclassified from Accumulated OCI into Income |  | $ (16) |
Cash Flow Hedge |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of (Loss) Recognized in OCI on Derivative |  | 1 |
Amount of (Loss) Recognized in OCI Excluded Component |  | 1 |
Amount of Gain Reclassified from Accumulated OCI into Income |  | (16) |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component |  | (16) |
Cash Flow Hedge | Interest rate products | Interest income |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Amount of (Loss) Recognized in OCI on Derivative |  | 1 |
Amount of (Loss) Recognized in OCI Excluded Component |  | 1 |
Amount of Gain Reclassified from Accumulated OCI into Income |  | (16) |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income Excluded Component |  | $ (16) |

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