Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income for common stock	$ 30,450	$ 26,671
Derivatives qualified as cash flow hedges:
Unrealized interest rate hedging loss, net of taxes of nil and $(135), respectively	0	(388)
Reclassification adjustment to net income, net of taxes of $(18) and $(17), respectively	(52)	(50)
Retirement benefit plans:
Adjustment for amortization of net gains recognized during the period in net periodic benefit cost, net of taxes of $(159) and $(176), respectively	(458)	(505)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory accounts, net of taxes of $151 and $168, respectively	436	483
Other comprehensive loss, net of tax benefits	(74)	(460)
Comprehensive income attributable to Hawaiian Electric Industries, Inc.	$ 30,376	$ 26,211