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TAX EFFECT ALLOCATED TO EACH COMPONENT OF OTHER COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Income and Comprehensive Income
Amortization of net losses of pension and postretirement benefit plans	$ (851)	$ (1,357)	$ (2,555)	$ (4,070)
Unrealized holding losses on debt securities arising during the period	(15,683)	(54,779)	(51,994)	(58,334)
Amortization of unrealized losses of debt securities transfer from available-for-sale to held-to-maturity	(9,438)	(9,067)	(27,749)	(26,753)
Income tax expense	$ (25,972)	$ (65,203)	$ (82,298)	$ (89,157)

X

- Definition

Amount of tax expense (benefit) on adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Publisher FASB
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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

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- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
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