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Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income (loss) for common stock $ 26,085 $ (1,295,484) $ 52,756 $ (1,253,362)
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 nil, $(617), nil and $(5,592), respectively 0 (1,686) 0 (15,275)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of nil, $1,205, nil and $2,334, respectively 0 3,288 0 6,374
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging gains (losses) arising during the period, net of taxes of $(80), $11, $(215) and $267, respectively (232) 29 (620) 769
Reclassification adjustment to net income, net of taxes of $(18), $(18), $(35) and $(34), respectively (50) (51) (100) (99)
Retirement benefit plans:        
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes of $(175), $(155), $(351) and $(309), respectively (508) (445) (1,013) (894)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $167, $160, $335 and $319, respectively 484 459 967 918
Other comprehensive income (loss), net of taxes (306) 1,594 (766) (8,207)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. $ 25,779 $ (1,293,890) $ 51,990 $ (1,261,569)