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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized losses on available-for-sale investment securities arising during the period, tax $ 0 $ 13,470 $ 0 $ 7,878
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 0 1,231 0 3,565
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging gains (losses) arising during the period, tax 46 (291) (169) (24)
Reclassification adjustment to net income, tax (304) (18) (339) (52)
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, tax (187) (431) (538) (740)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ 192 $ 462 $ 527 $ 781