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Income taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 130,844	$ 89,176	$ 92,959
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	13,915	8,097	9,073
Other, net	(21,064)	(4,252)	(6,453)
Federal and state taxes	$ 123,695	$ 93,021	$ 95,579
Effective income tax rate (as a percent)	33.10%	36.50%	36.00%
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 80,190	$ 75,996	$ 77,126
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	8,494	6,726	7,047
Other, net	(3,883)	(3,300)	(3,448)
Federal and state taxes	$ 84,801	$ 79,422	$ 80,725
Effective income tax rate (as a percent)	37.00%	36.60%	36.60%

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