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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Statement of Income Captions [Line Items]
Net income for common stock	$ 42,512	$ 45,688	$ 46,054	$ 40,247	$ 88,200	$ 86,301
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) benefits of $(5,182), $1,592, $(8,637) and $6,459, respectively	14,154		(4,348)		23,593	(17,645)
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) benefits of $44, $133, $(1,122), and $827, respectively	2,503		5,350		5,006	10,496
Other comprehensive income (loss), net of taxes	13,699	$ 9,241	(3,825)	$ (12,773)	22,940	(16,598)
Comprehensive income attributable to Hawaiian Electric Industries, Inc.	56,211		42,229		111,140	69,703
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits	(5,182)		1,592		(8,637)	6,459
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, (taxes) benefits	871		1,862		1,741	3,654
American Savings Bank (ASB)
Condensed Statement of Income Captions [Line Items]
Net income for common stock	17,016		20,561		37,855	39,521
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) benefits of $(5,182), $1,592, $(8,637) and $6,459, respectively	14,154		(4,348)		23,593	(17,645)
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) benefits of $44, $133, $(1,122), and $827, respectively	121		366		(3,066)	1,588
Other comprehensive income (loss), net of taxes	14,275		(3,982)		20,527	(16,057)
Comprehensive income attributable to Hawaiian Electric Industries, Inc.	31,291		16,579		58,382	23,464
Net unrealized gains (losses) on securities arising during the period, (taxes) benefits	(5,182)		1,592		(8,637)	6,459
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, (taxes) benefits	$ (44)		$ (133)		$ 1,122	$ (827)

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