Consolidated Statements of Changes in Common Stock Equity (unaudited) - 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, 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	66,884	66,884		59,715			59,715
Other comprehensive income, net of taxes	931		931	7				7
Common stock dividends	(65,140)	(65,140)		(45,203)			(45,203)
Common stock issuance expenses				(5)		(5)
Ending Balance at Jun. 30, 2015	1,898,520	298,398	(26,447)	1,696,658	$ 105,388	578,933	1,012,285	52
Balance (in shares) at Jun. 30, 2015					15,805,000
Beginning 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	$ 76,480	76,480		61,224			61,224
Other comprehensive income, net of taxes	10,908		10,908	261				261
Common stock dividends	(66,848)	(66,848)		(46,800)			(46,800)
Common stock issuance expenses				(4)		(4)
Ending Balance at Jun. 30, 2016	$ 1,966,182	$ 334,398	$ (15,354)	$ 1,743,006	$ 105,388	$ 578,926	$ 1,057,506	$ 1,186
Balance (in shares) at Jun. 30, 2016	108,187,063				15,805,000