Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income for common stock	$ 241,138	$ 246,166	$ 197,824
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 $(110,140), $(18,903) and $7,008 for 2022, 2021 and 2020, respectively	(300,860)	(51,636)	19,143
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, $(142) and $(599) for 2022, 2021 and 2020, respectively	0	(387)	(1,638)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of $1,462, nil and nil for 2022, 2021 and 2020, respectively	3,993	0	0
Derivatives qualified as cash flow hedges:
Unrealized interest rate hedging gains (losses), net of taxes of $1,892, $(108) and $(607) for 2022, 2021 and 2020, respectively	5,457	(312)	(1,750)
Reclassification adjustment to net income, net of taxes of $60, $13 and nil for 2022, 2021 and 2020, respectively	172	37	0
Retirement benefit plans:
Net gains (losses) arising during the period, net of taxes of $65,174, $53,068 and $(20,907) for 2022, 2021 and 2020, respectively	188,020	153,121	(60,529)
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of taxes of $6,820, $6,665 and $8,247 for 2022, 2021 and 2020, respectively	19,659	19,253	23,689
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $(69,345), $(59,429) and $13,825 for 2022, 2021 and 2020, respectively	(199,936)	(171,345)	39,860
Other comprehensive income (loss), net of taxes	(283,495)	(51,269)	18,775
Comprehensive income attributable to Hawaiian Electric Industries, Inc.	$ (42,357)	$ 194,897	$ 216,599