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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, tax $ (4,021) $ (32,529) $ 2,058 $ (76,608)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 1,350 0 2,696 0
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging arising during the period, tax (117) 273 (52) 1,319
Reclassification adjustment for net unrealized losses included in net income, tax (16) 18 (33) 37
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax (122) 44 (244) 1,606
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ 148 $ 19 $ 295 $ (1,481)