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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
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Mar. 31, 2025 | Mar. 31, 2024
Reclassifications Out of Accumulated Other Comprehensive Loss |  |
Net of tax | $ (37,670) | $ (37,469)
Adjustment of pension and postretirement benefit plans |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |
Before Tax | (2,273) | (3,618)
Income tax benefit | 852 | 1,356
Net of tax | (1,421) | (2,262)
Adjustment of pension and postretirement benefit plans | Other operating expenses |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |
Before Tax | (2,273) | (3,618)
Unrealized net holding (losses) gains on debt securities |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |
Before Tax | (45,311) | (44,009)
Income tax benefit | 9,062 | 8,802
Net of tax | (36,249) | (35,207)
Unrealized net holding (losses) gains on debt securities | Investment securities |  |
Reclassifications Out of Accumulated Other Comprehensive Loss |  |
Before Tax | $ (45,311) | $ (44,009)

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