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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 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 | $ 6,079 | $ (44,079)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes | 1,346 | 0
Derivatives qualifying as cash flow hedges: |  |
Unrealized interest rate hedging arising during the period, tax | 65 | 1,046
Reclassification adjustment for net unrealized losses included in net income, tax | (17) | 19
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax | (122) | 1,562
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax | $ 147 | $ (1,500)

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