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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (decrease) in stockholders' equity
Beginning Balance			$ 2,097,386	$ 2,066,753
Net income for common stock	$ 65,900	$ 60,073	152,201	132,927
Other comprehensive income (loss), net of taxes	(4,589)	554	(21,187)	3,909
Common stock dividends			(101,235)	(101,149)
Ending Balance	2,132,045	2,103,022	2,132,045	2,103,022
Consolidating adjustments
Increase (decrease) in stockholders' equity
Beginning Balance			(557,013)	(550,946)
Net income for common stock	(16,636)	(12,767)	(35,041)	(29,306)
Other comprehensive income (loss), net of taxes	0	0	(1)	(1)
Common stock dividends			20,481	20,581
Common stock issuance expenses			0	1
Ending Balance	(571,574)	(559,671)	(571,574)	(559,671)
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	49,712	47,487	108,356	94,596
Other comprehensive income (loss), net of taxes	28	22	85	521
Common stock dividends			(77,479)	(65,825)
Common stock issuance expenses			(8)	(4)
Ending Balance	1,876,237	1,829,075	1,876,237	1,829,075
HELCO | Reportable Legal Entities
Increase (decrease) in stockholders' equity
Beginning Balance			286,647	291,291
Net income for common stock	9,175	6,434	19,039	14,650
Other comprehensive income (loss), net of taxes	0	0	1	1
Common stock dividends			(11,467)	(11,622)
Common stock issuance expenses			0	(1)
Ending Balance	294,220	294,319	294,220	294,319
Maui Electric | Reportable Legal Entities
Increase (decrease) in stockholders' equity
Beginning Balance			270,265	259,554
Net income for common stock	7,461	6,333	16,002	14,656
Other comprehensive income (loss), net of taxes	0	0	0	0
Common stock dividends			(9,014)	(8,959)
Common stock issuance expenses			0	0
Ending Balance	277,253	265,251	277,253	265,251
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	49,712	47,487	108,356	94,596
Other comprehensive income (loss), net of taxes	28	22	85	521
Common stock dividends			(77,479)	(65,825)
Common stock issuance expenses			(8)	(4)
Ending Balance	$ 1,876,237	$ 1,829,075	$ 1,876,237	$ 1,829,075

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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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