Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income for common stock	$ 62,082	$ 63,415	$ 183,790	$ 191,645
Net unrealized losses on available-for-sale investment securities:
Net unrealized losses on available-for-sale investment securities arising during the period, net of taxes of $(36,230), $(4,212), $(112,838) and $(14,614), respectively	(98,965)	(11,507)	(308,229)	(39,921)
Reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, nil and $(142), respectively	0	0	0	(387)
Derivatives qualifying as cash flow hedges:
Unrealized interest rate hedging gains arising during the period, net of taxes of $901, $48, $2,220 and $347, respectively	2,597	139	6,400	1,000
Reclassification adjustment for net realized losses included in net income, net of taxes of $19, $3, $56 and $3, respectively	53	9	161	9
Retirement benefit plans:
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of taxes of $1,943, $985, $3,549 and $5,155, respectively	5,606	2,853	10,229	14,871
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $(1,839), $(971), $(3,320) and $(5,002), respectively	(5,303)	(2,799)	(9,572)	(14,421)
Other comprehensive loss, net of taxes	(96,012)	(11,305)	(301,011)	(38,849)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc.	$ (33,930)	$ 52,110	$ (117,221)	$ 152,796