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TAX EFFECT ALLOCATED TO EACH COMPONENT OF OTHER COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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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)

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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 of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-12 + Details
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