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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
	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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