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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 | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Net of tax | $ (39,174) | $ (38,525) | $ (115,256) | $ (113,792)
Adjustment of pension and postretirement benefit plans |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | (2,272) | (3,618) | (6,817) | (10,854)
Income tax benefit (expense) | 851 | 1,357 | 2,555 | 4,070
Net of tax | (1,421) | (2,261) | (4,262) | (6,784)
Adjustment of pension and postretirement benefit plans | Other operating expenses |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | (2,272) | (3,618) | (6,817) | (10,854)
Unrealized net holding losses on debt securities |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | (47,191) | (45,331) | (138,743) | (133,761)
Income tax benefit (expense) | 9,438 | 9,067 | 27,749 | 26,753
Net of tax | (37,753) | (36,264) | (110,994) | (107,008)
Unrealized net holding losses on debt securities | Interest income from investment securities |  |  |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |  |  |
Before Tax | $ (47,191) | $ (45,331) | $ (138,743) | $ (133,761)

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