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Shareholders' equity - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			$ 2,097,386	$ 2,066,753
Current period other comprehensive income (loss)	$ (3,825)	$ 2,370	(16,598)	3,355
Ending Balance	2,103,018	2,075,029	2,103,018	2,075,029
AOCI
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			(41,941)	(33,129)
Current period other comprehensive income (loss)			(16,598)	3,355
Ending Balance	(58,539)	(29,774)	(58,539)	(29,774)
Net unrealized gains (losses) on securities
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			(14,951)	(7,931)
Current period other comprehensive income (loss)			(17,645)	2,244
Ending Balance	(32,596)	(5,687)	(32,596)	(5,687)
Unrealized gains (losses) on derivatives
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			0	(454)
Current period other comprehensive income (loss)			0	454
Ending Balance	0	0	0	0
Retirement benefit plans
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			(26,990)	(24,744)
Current period other comprehensive income (loss)			1,047	657
Ending Balance	(25,943)	(24,087)	(25,943)	(24,087)
Hawaiian Electric Company, Inc. and Subsidiaries
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			1,845,283	1,799,787
Current period other comprehensive income (loss)	26	40	57	499
Ending Balance	1,852,324	1,803,506	1,852,324	1,803,506
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			(1,219)	(322)
Current period other comprehensive income (loss)			57	499
Ending Balance	(1,162)	177	(1,162)	177
Hawaiian Electric Company, Inc. and Subsidiaries | Unrealized gains (losses) on derivatives
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			0	(454)
Current period other comprehensive income (loss)			0	454
Ending Balance	0	0	0	0
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance			(1,219)	132
Current period other comprehensive income (loss)			57	45
Ending Balance	$ (1,162)	$ 177	$ (1,162)	$ 177

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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