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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net unrealized gains (losses) on available-for sale investment securities: |  |  |
Net unrealized gains (losses) on securities arising during the period, tax (benefits) | $ (110,140) | $ (18,903) | $ 7,008
Reclassification adjustment for net realized gains included in net income, tax expenses | 0 | (142) | (599)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes | 1,462 | 0 | 0
Derivatives qualified as cash flow hedges: |  |  |
Foreign currency hedge net unrealized loss, taxes (benefits) | 1,892 | (108) | (607)
Reclassification adjustment to net income, taxes | 60 | 13 | 0
Retirement benefit plans: |  |  |
Net gains (losses) arising during the period, taxes (benefits) | 65,174 | 53,068 | (20,907)
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits | 6,820 | 6,665 | 8,247
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits | $ (69,345) | $ (59,429) | $ 13,825

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10B -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124260725&loc=SL120268667-111560 + Details
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