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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
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 | $ (4,975) | $ 6,079
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes | 1,129 | 1,346
Derivatives qualifying as cash flow hedges: |  |
Unrealized interest rate hedging arising during the period, tax | 256 | 65
Reclassification adjustment for net unrealized losses included in net income, tax | (16) | (17)
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, tax | (154) | (122)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax | $ (159) | $ (147)

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