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Shareholders' equity - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	$ 2,337,502	$ 2,280,260
Current period other comprehensive income (loss)	(44,016)	18,212
Ending Balance	2,321,293	2,276,505
AOCI
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	(1,264)	(20,039)
Current period other comprehensive income (loss)	(44,016)	18,212
Ending Balance	(45,280)	(1,827)
Net unrealized gains (losses) on securities
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	19,986	2,481
Current period other comprehensive income (loss)	(45,777)	19,448
Ending Balance	(25,791)	21,929
Unrealized gains (losses) on derivatives
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	(3,363)	(1,613)
Current period other comprehensive income (loss)	1,562	(1,784)
Ending Balance	(1,801)	(3,397)
Retirement benefit plans
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	(17,887)	(20,907)
Current period other comprehensive income (loss)	199	548
Ending Balance	(17,688)	(20,359)
Hawaiian Electric Company, Inc. and Subsidiaries
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	2,141,918	2,047,352
Current period other comprehensive income (loss)	34	26
Ending Balance	2,157,385	2,044,499
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	(2,919)	(1,279)
Current period other comprehensive income (loss)	34	26
Ending Balance	(2,885)	(1,253)
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning Balance	(2,919)	(1,279)
Current period other comprehensive income (loss)	34	26
Ending Balance	$ (2,885)	$ (1,253)

X

- Definition

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

+ References

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- Definition

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

+ References

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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.

+ References

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