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Derivatives and hedging activities - Effect of Other Derivative Instruments on the Income Statement (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain Recognized in Income | $ 53 | $ 284 | $ (108) | $ 527
Interest Rate Swaps | Interest Rate Swap Revenue |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain Recognized in Income | 23 | 283 | (138) | 523
Other |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain Recognized in Income | $ 30 | 1 | 30 | 4
Fee Income | Interest Rate Swap Revenue |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Amount of Gain Recognized in Income |  | $ 1 | $ 384 | $ 104

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