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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
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 | $ (4,212) | $ 360 | $ (14,614) | $ 7,836
Reclassification adjustment for net realized gains included in net income, tax | 0 | 0 | (142) | (599)
Derivatives qualifying as cash flow hedges: |  |  |  |
Unrealized interest rate hedging arising during the period, tax | 48 | (51) | 347 | (739)
Reclassification adjustment for net unrealized losses included in net income, tax | 3 | 0 | 3 | 0
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax | 985 | 2,202 | 5,155 | 6,169
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax | (971) | (1,985) | (5,002) | (5,563)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Retirement benefit plans: |  |  |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax | 1,007 | 2,001 | 5,062 | 5,597
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax | $ (971) | $ (1,985) | $ (5,002) | $ (5,563)

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