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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Statement of Income and Comprehensive Income |  |  |  |
Adjustment of pension and postretirement benefit plans | $ 0 | $ 0 | $ 0 | $ 0
Amortization of net losses of pension and postretirement benefit plans | (1,357) | (1,805) | (4,070) | (5,415)
Unrealized holding losses on debt securities arising during the period | (54,779) | (7,740) | (58,334) | (21,396)
Amortization of unrealized losses of debt securities transfer from available-for-sale to held-to-maturity | (9,067) | (8,756) | (26,753) | (25,744)
Unrealized net (losses) gains on cash flow hedges | 0 | 0 | 0 | 11
Reclassification adjustment for net (gains) losses included in net income | 0 | 0 | 0 | 15
Income tax expense | $ (65,203) | $ (18,301) | $ (89,157) | $ (52,529)

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- 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 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 10B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481889/320-10-35-10B + Details
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- Definition Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 + Details
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- Definition Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 + Details
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