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Other comprehensive income (loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Other comprehensive income (loss) |  |
Net unrealized loss on investment securities available for sale | $ (41,528) | $ (48,959)
Income tax benefit | (9,060) | (10,681)
Net of income taxes | (32,468) | (38,278)
Benefit plan adjustments | (2,852) | (2,852)
Income tax benefit | (622) | (622)
Net of income taxes | (2,230) | (2,230)
Derivative adjustments | (371) | (239)
Income tax benefit | (81) | (52)
Net of income taxes | (290) | (187)
Accumulated other comprehensive loss | $ (34,988) | $ (40,695)

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