Consolidated Statements of Changes in Common Stock Equity (unaudited) - HECO - USD ($) $ in Thousands	Total	Hawaiian Electric Company, Inc. and Subsidiaries	Common stock Hawaiian Electric Company, Inc. and Subsidiaries	Premium on capital stock Hawaiian Electric Company, Inc. and Subsidiaries	Retained Earnings Hawaiian Electric Company, Inc. and Subsidiaries	Accumulated other comprehensive income (loss) Hawaiian Electric Company, Inc. and Subsidiaries
Balance at Dec. 31, 2013	$ 1,726,406	$ 1,593,564	$ 102,880	$ 541,452	$ 948,624	$ 608
Balance (in shares) at Dec. 31, 2013			15,429,000
Increase (decrease) in stockholders' equity
Net income for common stock	45,787	35,420			35,420
Other comprehensive income, net of taxes	1,167	9				9
Common stock dividends	(31,448)	(22,707)			(22,707)
Common stock issuance expenses		(3)		(3)
Balance at Mar. 31, 2014	1,745,124	1,606,283	$ 102,880	541,449	961,337	617
Balance (in shares) at Mar. 31, 2014			15,429,000
Balance at Dec. 31, 2014	$ 1,790,573	1,682,144	$ 105,388	578,938	997,773	45
Balance (in shares) at Dec. 31, 2014	102,565,266		15,805,000
Increase (decrease) in stockholders' equity
Net income for common stock	$ 31,866	26,874			26,874
Other comprehensive income, net of taxes	4,058	22				22
Common stock dividends	(31,840)	(22,601)			(22,601)
Common stock issuance expenses		(5)		(5)
Balance at Mar. 31, 2015	$ 1,897,909	$ 1,686,434	$ 105,388	$ 578,933	$ 1,002,046	$ 67
Balance (in shares) at Mar. 31, 2015	107,417,644		15,805,000