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Quarterly information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                      
Revenues $ 624,032 $ 717,176 $ 623,912 $ 637,862 $ 790,040 $ 867,096 $ 798,657 $ 783,749 $ 2,602,982 $ 3,239,542 $ 3,238,470
Operating income 83,222 97,095 72,730 69,506 68,167 92,036 83,183 89,214 322,553 332,600 317,508
Net income 42,793 51,144 35,491 32,339 33,726 48,279 41,754 46,260 161,767 170,019 163,599
Net income for common stock $ 42,320 $ 50,673 $ 35,018 $ 31,866 $ 33,253 $ 47,808 $ 41,281 $ 45,787 $ 159,877 $ 168,129 $ 161,709
Basic earnings per common share (in dollars per share) $ 0.39 $ 0.47 $ 0.33 $ 0.31 $ 0.32 $ 0.47 $ 0.41 $ 0.45 $ 1.50 $ 1.65 $ 1.63
Diluted earnings per common share (in dollars per share) 0.39 0.47 0.33 0.31 0.32 0.46 0.41 0.45 1.50 1.63 1.62
Dividends per common share (in dollars per share) 0.31 0.31 0.31 0.31 0.31 0.31 0.31 0.31 1.24 1.24 $ 1.24
Market price per common share                      
High end of range (in dollars per share) 30.29 31.28 32.58 34.86 35.00 26.89 25.65 26.80 34.86 35.00  
Low end of range (in dollars per share) $ 27.45 $ 27.02 $ 29.62 $ 31.75 $ 26.04 $ 22.71 $ 23.04 $ 24.39 $ 27.02 $ 22.71  
Hawaiian Electric Company, Inc. and Subsidiaries                      
Condensed Financial Statements, Captions [Line Items]                      
Revenues $ 555,434 $ 648,127 $ 558,163 $ 573,442 $ 725,267 $ 803,565 $ 738,429 $ 720,062 $ 2,335,166 $ 2,987,323 $ 2,980,172
Operating income 67,662 82,657 66,161 57,636 58,878 76,156 70,068 70,666 274,116 275,768 245,513
Net income 33,492 43,504 33,340 27,373 29,611 39,377 34,729 35,919 137,709 139,636 124,924
Net income for common stock $ 32,993 $ 43,006 $ 32,841 $ 26,874 $ 29,112 $ 38,879 $ 34,230 $ 35,420 $ 135,714 $ 137,641 $ 122,929