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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized losses on available-for-sale investment securities arising during the period, tax $ (13,918) $ (36,230) $ (11,860) $ (112,838)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 1,354 0 4,050 0
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging arising during the period, tax (185) 901 (237) 2,220
Reclassification adjustment for net unrealized losses included in net income, tax (17) 19 (50) 56
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax (153) 1,943 (397) 3,549
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ 163 $ (1,839) $ 458 $ (3,320)