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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Statement of Comprehensive Income [Abstract] |  |
Net income for common stock | $ 69,167 | $ 64,358
Net unrealized gains (losses) on available-for-sale investment securities: |  |
Net unrealized losses on available-for-sale investment securities arising during the period, net of taxes of $(44,079) and $(16,616), respectively | (120,407) | (45,390)
Reclassification adjustment for net realized gains included in net income, net of taxes of $— and $(142), respectively | 0 | (387)
Derivatives qualifying as cash flow hedges: |  |
Unrealized interest rate hedging gains arising during the period, net of taxes of $1,046 and $542, respectively | 3,017 | 1,562
Reclassification adjustment for net realized losses included in net income, net of taxes of $19 and nil, respectively | 55 | 0
Retirement benefit plans: |  |
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of taxes | 4,501 | 6,010
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (4,325) | (5,811)
Other comprehensive loss, net of tax benefits | (117,159) | (44,016)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | $ (47,992) | $ 20,342

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