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Shareholders' equity - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,321,293	$ 2,337,502	$ 2,276,505	$ 2,280,260	$ 2,337,502	$ 2,280,260
Current period other comprehensive income (loss)	16,472	(44,016)	(332)	18,212	(27,544)	17,880
Ending balance	2,367,329	2,321,293	2,291,398	2,276,505	2,367,329	2,291,398
AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(45,280)	(1,264)	(1,827)	(20,039)	(1,264)	(20,039)
Current period other comprehensive income (loss)	16,472	(44,016)	(332)	18,212
Ending balance	(28,808)	(45,280)	(2,159)	(1,827)	(28,808)	(2,159)
Net unrealized gains (losses) on securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		19,986		2,481	19,986	2,481
Current period other comprehensive income (loss)					(28,801)	18,783
Ending balance	(8,815)		21,264		(8,815)	21,264
Unrealized gains (losses) on derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(3,363)		(1,613)	(3,363)	(1,613)
Current period other comprehensive income (loss)					861	(1,982)
Ending balance	(2,502)		(3,595)		(2,502)	(3,595)
Retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(17,887)		(20,907)	(17,887)	(20,907)
Current period other comprehensive income (loss)					396	1,079
Ending balance	(17,491)		(19,828)		(17,491)	(19,828)
Hawaiian Electric Company, Inc. and Subsidiaries
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,157,385	2,141,918	2,044,499	2,047,352	2,141,918	2,047,352
Current period other comprehensive income (loss)	35	34	25	26	69	51
Ending balance	2,171,396	2,157,385	2,060,069	2,044,499	2,171,396	2,060,069
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,885)	(2,919)	(1,253)	(1,279)	(2,919)	(1,279)
Current period other comprehensive income (loss)	35	34	25	26
Ending balance	(2,850)	(2,885)	(1,228)	(1,253)	(2,850)	(1,228)
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		$ (2,919)		$ (1,279)	(2,919)	(1,279)
Current period other comprehensive income (loss)					69	51
Ending balance	$ (2,850)		$ (1,228)		$ (2,850)	$ (1,228)

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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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