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Other comprehensive income (loss) - Reclassification out of accumulated other comprehensive loss (Details) - Reclassifications Out of Accumulated Other Comprehensive Loss - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Net of tax | $ (38,414) | $ (37,798) | $ (76,083) | $ (75,267)
Adjustment of pension and postretirement benefit plans |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | (2,272) | (3,618) | (4,545) | (7,236)
Income tax benefit (expense) | 852 | 1,357 | 1,704 | 2,714
Net of tax | (1,420) | (2,261) | (2,841) | (4,522)
Adjustment of pension and postretirement benefit plans | Other operating expenses |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | (2,272) | (3,618) | (4,545) | (7,236)
Unrealized net holding (losses) gains on debt securities |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | (46,242) | (44,421) | (91,552) | (88,430)
Income tax benefit (expense) | 9,248 | 8,884 | 18,310 | 17,685
Net of tax | (36,994) | (35,537) | (73,242) | (70,745)
Unrealized net holding (losses) gains on debt securities | Investment securities |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | $ (46,242) | $ (44,421) | $ (91,552) | $ (88,430)

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