Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income for common stock	$ 54,610	$ 52,541	$ 109,331	$ 121,708
Net unrealized gains (losses) on available-for-sale investment securities:
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of taxes of $(4,021), $(32,529), $2,058 and $(76,608), respectively	(10,984)	(88,857)	5,621	(209,264)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of $1,350, nil, $2,696 and nil, respectively	3,689	0	7,366	0
Derivatives qualifying as cash flow hedges:
Unrealized interest rate hedging gains (losses) arising during the period, net of taxes of $(117), $273, $(52) and $1,319, respectively	(335)	786	(149)	3,803
Reclassification adjustment to net income, net of taxes of $(16), $18, $(33) and $37, respectively	(48)	53	(96)	108
Retirement benefit plans:
Adjustment for amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost, net of taxes of $(122), $44, $(244) and $1,606, respectively	(357)	122	(714)	4,623
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $148, $19, $295 and $(1,481), respectively	426	56	851	(4,269)
Other comprehensive income (loss), net of taxes	(7,609)	(87,840)	12,879	(204,999)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	$ 47,001	$ (35,299)	$ 122,210	$ (83,291)