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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) by component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Foreign Currency Translation
Beginning Balance	$ (70,512)	$ (68,383)	$ (71,365)	$ (64,528)
Other comprehensive (loss) income	(14,524)	615	(13,670)	(3,240)
Net change	(14,524)	615	(13,670)	(3,240)
Ending Balance	(85,035)	(67,768)	(85,035)	(67,768)
Adjustment of pension and postretirement benefit plans
Beginning Balance	(91,851)	(113,371)	(94,692)	(117,894)
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses	1,421	2,261	4,262	6,784
Net change	1,421	2,261	4,262	6,784
Ending Balance	(90,430)	(111,110)	(90,430)	(111,110)
Unrealized net holding losses on debt securities
Beginning Balance	(1,233,294)	(1,696,528)	(1,495,183)	(1,713,109)
Other comprehensive income	94,747	326,148	283,394	271,985
Amounts reclassified from accumulated other comprehensive loss for amortization of net unrealized losses of debt securities transferred from available-for-sale to held-to-maturity	37,753	36,264	110,994	107,008
Net change	132,500	362,412	394,388	378,993
Ending Balance	(1,100,795)	(1,334,116)	(1,100,795)	(1,334,116)
Total	(1,276,260)	$ (1,512,994)	(1,276,260)	$ (1,512,994)	$ (1,661,240)
Rounding
Foreign Currency Translation
Ending Balance	(85,036)		(85,036)
Unrealized net holding losses on debt securities
Ending Balance	$ (1,100,794)		$ (1,100,794)

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