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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net unrealized gains (losses) on available-for sale investment securities:      
Net unrealized gains (losses) on securities arising during the period, tax (benefits) $ (4,110) $ 7,536 $ (110,140)
Reclassification adjustment for net realized losses (gains) included in net income, tax expenses 0 4,011 0
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 4,764 5,271 1,462
Derivatives qualified as cash flow hedges:      
Foreign currency hedge net unrealized loss, taxes (benefits) 237 (58) 1,892
Reclassification adjustment to net income, taxes (70) (65) 60
Retirement benefit plans:      
Net gains (losses) arising during the period, taxes (benefits) 23,015 3,778 65,174
Amortization of net losses (gains), prior service gain and transition obligation included in net periodic benefit cost, tax benefits (597) (535) 6,820
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits $ (22,096) $ (2,846) $ (69,345)