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Derivatives and hedging activities - Effect of Derivative Instruments Not Designated as Hedging Instruments on the Consolidated Statements of Income and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fee Income | Fee Income |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives | $ 219 | $ 67 | $ 537 | $ 195
Derivatives not designated as hedging instruments |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives | (36) | (120) | (152) | (170)
Derivatives not designated as hedging instruments | Interest rate products | Other income / (expense) |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives | $ (36) | $ (120) | (148) | $ (170)
Derivatives not designated as hedging instruments | Other contracts | Other income / (expense) |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives |  |  | $ (4) |

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