Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income for common stock	$ 54,721	$ 69,167
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 $6,079 and $(44,079), respectively	16,605	(120,407)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes of $1,346 and nil, respectively	3,677	0
Derivatives qualifying as cash flow hedges:
Unrealized interest rate hedging gains arising during the period, net of taxes of $65 and $1,046, respectively	186	3,017
Reclassification adjustment to net income, net of taxes of $(17) and $19, respectively	(48)	55
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) and $1,562, respectively	(357)	4,501
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $147 and $(1,500), respectively	425	(4,325)
Other comprehensive income (loss), net of taxes	20,488	(117,159)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	$ 75,209	$ (47,992)