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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
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 | $ (32,529) | $ 6,214 | $ (76,608) | $ (10,402)
Reclassification adjustment for net realized gains included in net income, tax | 0 | 0 | 0 | (142)
Derivatives qualifying as cash flow hedges: |  |  |  |
Unrealized interest rate hedging arising during the period, tax | 273 | (243) | 1,319 | 299
Reclassification adjustment for net unrealized losses included in net income, tax | 18 | 0 | 37 | 0
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax | 44 | 2,086 | 1,606 | 4,170
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax | $ 19 | $ (2,016) | $ (1,481) | $ (4,031)

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