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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net unrealized gains (losses) on available-for sale investment securities:      
Net unrealized gains (losses) on securities arising during the period, tax (benefits) $ 7,536 $ (110,140) $ (18,903)
Reclassification adjustment for net realized losses (gains) included in net income, tax expenses 4,011 0 (142)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 5,271 1,462 0
Derivatives qualified as cash flow hedges:      
Foreign currency hedge net unrealized loss, taxes (benefits) (58) 1,892 (108)
Reclassification adjustment to net income, taxes (65) 60 13
Retirement benefit plans:      
Net gains (losses) arising during the period, taxes (benefits) 3,778 65,174 53,068
Amortization of net losses (gains), prior service gain and transition obligation included in net periodic benefit cost, tax benefits (535) 6,820 6,665
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits $ (2,846) $ (69,345) $ (59,429)