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Accumulated other comprehensive loss - Components of AOCL Included in Stockholders Equity (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 | Dec. 31, 2025
Accumulated other comprehensive loss |  |
Net unrealized loss on investment securities available for sale | $ (30,606) | $ (29,144)
Income tax benefit | (6,711) | (6,390)
Net of income taxes | (23,895) | (22,754)
Benefit plan adjustments | (2,178) | (2,178)
Income tax benefit | (478) | (478)
Net of income taxes | (1,700) | (1,700)
Derivative adjustments | (67) | (303)
Income tax benefit | (14) | (66)
Net of income taxes | (53) | (237)
Accumulated other comprehensive loss | $ (25,648) | $ (24,691)

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