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Income taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 89,176	$ 92,959	$ 87,442
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	8,097	9,073	8,667
Other, net	(4,252)	(6,453)	(9,872)
Federal and state taxes	$ 93,021	$ 95,579	$ 86,237
Effective income tax rate (as a percent)	36.50%	36.00%	34.50%
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 75,996	$ 77,126	$ 67,914
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	6,726	7,047	6,211
Other, net	(3,300)	(3,448)	(5,008)
Federal and state taxes	$ 79,422	$ 80,725	$ 69,117
Effective income tax rate (as a percent)	36.60%	36.60%	35.60%

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