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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

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