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Basis of presentation - Basis of presentation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Total revenues $ 867,096 $ 829,168 $ 2,449,502 $ 2,405,967  
Operating income 91,102 88,038 261,683 237,070  
Interest expense, net—other than on deposit liabilities and other bank borrowings (19,170) (19,043) (58,648) (56,216)  
Income before income taxes 74,609 70,748 209,845 186,510  
Income taxes 26,323 22,041 73,265 62,590  
Property, plant and equipment, net of accumulated depreciation 4,048,106   4,048,106   3,865,514
Accumulated depreciation (2,241,677)   (2,241,677)   (2,192,422)
Other assets 505,226   505,226   512,627
As previously filed
          
Total revenues   831,229   2,412,023  
Operating income   90,099   243,126  
Interest expense, net—other than on deposit liabilities and other bank borrowings   (20,304)   (59,705)  
Income before income taxes   71,548   189,077  
Income taxes   22,841   65,157  
Property, plant and equipment, net of accumulated depreciation         3,858,947
Accumulated depreciation         (2,191,199)
Other assets         519,194
Difference
          
Total revenues   (2,061)   (6,056)  
Operating income   (2,061)   (6,056)  
Interest expense, net—other than on deposit liabilities and other bank borrowings   1,261   3,489  
Income before income taxes   (800)   (2,567)  
Income taxes   (800)   (2,567)  
Property, plant and equipment, net of accumulated depreciation         6,567
Accumulated depreciation         (1,223)
Other assets         (6,567)
Hawaiian Electric Company, Inc. and Subsidiaries
          
Total revenues 803,565 764,054 2,262,056 2,210,020  
Operating income 76,156 69,853 216,890 179,949  
Income taxes 23,042 18,258 64,686 49,210  
Property, plant and equipment, net of accumulated depreciation 3,972,947   3,972,947   3,792,329
Other assets         67,426
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed
          
Other assets         73,993
Hawaiian Electric Company, Inc. and Subsidiaries | Difference
          
Other assets         $ (6,567)