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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net unrealized gains (losses) on available-for sale investment securities:      
Net unrealized gains (losses) on securities arising during the period, tax (benefits) $ (18,903) $ 7,008 $ 10,024
Reclassification adjustment for net realized gains included in net income, tax expenses (142) (599) (175)
Derivatives qualified as cash flow hedges:      
Foreign currency hedge net unrealized loss, taxes (benefits) (108) (607) (409)
Reclassification adjustment to net income, taxes 13 0 0
Retirement benefit plans:      
Net gains (losses) arising during the period, taxes (benefits) 53,068 (20,907) 3,892
Amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits 6,665 8,247 3,512
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, (taxes) benefits $ (59,429) $ 13,825 $ (5,610)