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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net unrealized losses on available-for-sale investment securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, tax $ (36,230) $ (4,212) $ (112,838) $ (14,614)
Reclassification adjustment for net realized gains included in net income, tax 0 0 0 (142)
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging arising during the period, tax 901 48 2,220 347
Reclassification adjustment for net unrealized losses included in net income, tax 19 3 56 3
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax 1,943 985 3,549 5,155
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ (1,839) $ (971) $ (3,320) $ (5,002)