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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
	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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