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Income taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 91,672	$ 86,711	$ 76,092
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	7,490	7,772	6,464
Other, net	(7,450)	(10,142)	(5,697)
Federal and state taxes	$ 91,712	$ 84,341	$ 76,859
Effective income tax rate (as a percent)	35.00%	34.00%	35.40%
Hawaiian Electric Company, Inc. and Subsidiaries
Income Tax Expense (Benefit) [Line Items]
Amount at the federal statutory income tax rate	$ 77,126	$ 67,914	$ 56,812
Increase (decrease) resulting from:
State income taxes, net of effect on federal income taxes	7,047	6,211	5,453
Other, net	(3,448)	(5,008)	(1,217)
Federal and state taxes	$ 80,725	$ 69,117	$ 61,048
Effective income tax rate (as a percent)	36.60%	35.60%	37.60%

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