Consolidated Statements of Changes in Common Stock Equity - HECO - USD ($) $ in Thousands	Total	Retained earnings	Accumulated other comprehensive income (loss)	Hawaiian Electric Company, Inc. and Subsidiaries	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)
Beginning Balance at Dec. 31, 2013	$ 1,726,406	$ 255,030	$ (16,750)	$ 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	168,129	168,129		137,641			137,641
Other comprehensive income (loss), net of tax benefits	(10,628)		(10,628)	(563)				(563)
Issuance of common stock, net of expenses				39,994	$ 2,508	37,486
Issuance of common stock, net of expenses (in shares)					376,000
Common stock dividends	(126,505)	(126,505)		(88,492)			(88,492)
Ending Balance at Dec. 31, 2014	1,790,573	296,654	(27,378)	1,682,144	$ 105,388	578,938	997,773	45
Balance (in shares) at Dec. 31, 2014					15,805,000
Increase (decrease) in stockholders' equity
Net income for common stock	159,877	159,877		135,714			135,714
Other comprehensive income (loss), net of tax benefits	1,116		1,116	880				880
Issuance of common stock, net of expenses				(8)		(8)
Common stock dividends	(131,765)	(131,765)		(90,405)			(90,405)
Ending Balance at Dec. 31, 2015	$ 1,927,640	324,766	(26,262)	1,728,325	$ 105,388	578,930	1,043,082	925
Balance (in shares) at Dec. 31, 2015	107,460,406				15,805,000
Increase (decrease) in stockholders' equity
Net income for common stock	$ 248,256	248,256		142,317			142,317
Other comprehensive income (loss), net of tax benefits	(6,867)		(6,867)	(1,247)				(1,247)
Issuance of common stock, net of expenses				23,991	$ 1,430	22,561
Issuance of common stock, net of expenses (in shares)					215,000
Common stock dividends	(134,050)	(134,050)		(93,599)			(93,599)
Ending Balance at Dec. 31, 2016	$ 2,066,753	$ 438,972	$ (33,129)	$ 1,799,787	$ 106,818	$ 601,491	$ 1,091,800	$ (322)
Balance (in shares) at Dec. 31, 2016	108,583,413				16,020,000