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Other comprehensive loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Other comprehensive loss |  |
Net unrealized loss on investment securities available for sale | $ (71,021) | $ (66,250)
Income tax benefit | (15,294) | (14,266)
Net of income taxes | (55,727) | (51,984)
Benefit plan adjustments | (5,499) | (5,499)
Income tax benefit | 1,184 | 1,184
Net of income taxes | (4,315) | (4,315)
Derivative adjustments | 779 | (47)
Income tax expense (benefit) | 167 | (10)
Net of income taxes | 612 | (37)
Accumulated other comprehensive loss | $ (59,430) | $ (56,336)

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