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Other comprehensive income (loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Other comprehensive income (loss) |  |
Net unrealized loss on investment securities available for sale | $ (38,784) | $ (51,527)
Income tax benefit | (8,482) | (11,270)
Net of income taxes | (30,302) | (40,257)
Benefit plan adjustments | (4,370) | (4,370)
Income tax benefit | (956) | (956)
Net of income taxes | (3,414) | (3,414)
Derivative adjustments | (1,056) | (871)
Income tax benefit | (231) | (191)
Net of income taxes | (825) | (680)
Accumulated other comprehensive loss | $ (34,541) | $ (44,351)

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