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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 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 | $ (4,975)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes | 0 | 1,129
Derivatives qualifying as cash flow hedges: |  |
Unrealized interest rate hedging gains (losses) arising during the period, tax | (135) | 256
Reclassification adjustment to net income, tax | (17) | (16)
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, tax | (176) | (154)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax | $ 168 | $ 159

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