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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Increase (decrease) in stockholders' equity
Beginning Balance			$ 2,097,386	$ 2,066,753
Net income for common stock	$ 46,054	$ 38,661	86,301	72,854
Other comprehensive income (loss), net of taxes	(3,825)	2,370	(16,598)	3,355
Common stock dividends			(67,481)	(67,426)
Ending Balance	2,103,018	2,075,029	2,103,018	2,075,029
Consolidating adjustments
Increase (decrease) in stockholders' equity
Beginning Balance			(557,013)	(550,946)
Net income for common stock	(9,080)	(7,936)	(18,405)	(16,539)
Other comprehensive income (loss), net of taxes	(1)	(2)	(1)	(1)
Common stock dividends			13,654	13,721
Common stock issuance expenses			1	1
Ending Balance	(561,764)	(553,764)	(561,764)	(553,764)
Hawaiian Electric (parent only) | Reportable Legal Entities
Increase (decrease) in stockholders' equity
Beginning Balance			1,845,283	1,799,787
Net income for common stock	31,169	25,644	58,644	47,109
Other comprehensive income (loss), net of taxes	26	40	57	499
Common stock dividends			(51,652)	(43,884)
Common stock issuance expenses			(8)	(5)
Ending Balance	1,852,324	1,803,506	1,852,324	1,803,506
HELCO | Reportable Legal Entities
Increase (decrease) in stockholders' equity
Beginning Balance			286,647	291,291
Net income for common stock	3,763	3,632	9,864	8,216
Other comprehensive income (loss), net of taxes	1	1	1	1
Common stock dividends			(7,644)	(7,748)
Common stock issuance expenses			(3)	0
Ending Balance	288,865	291,760	288,865	291,760
Maui Electric | Reportable Legal Entities
Increase (decrease) in stockholders' equity
Beginning Balance			270,265	259,554
Net income for common stock	5,317	4,304	8,541	8,323
Other comprehensive income (loss), net of taxes	0	1	0	0
Common stock dividends			(6,010)	(5,973)
Common stock issuance expenses			2	(1)
Ending Balance	272,798	261,903	272,798	261,903
Other subsidiaries | Reportable Legal Entities
Increase (decrease) in stockholders' equity
Beginning Balance			101	101
Net income for common stock	0	0	0	0
Other comprehensive income (loss), net of taxes	0	0	0	0
Common stock dividends			0	0
Common stock issuance expenses			0	0
Ending Balance	101	101	101	101
Hawaiian Electric Company, Inc. and Subsidiaries
Increase (decrease) in stockholders' equity
Beginning Balance			1,845,283	1,799,787
Net income for common stock	31,169	25,644	58,644	47,109
Other comprehensive income (loss), net of taxes	26	40	57	499
Common stock dividends			(51,652)	(43,884)
Common stock issuance expenses			(8)	(5)
Ending Balance	$ 1,852,324	$ 1,803,506	$ 1,852,324	$ 1,803,506

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Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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