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Basis of presentation (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses $ 606,478 $ 554,479 $ 1,180,463 $ 1,076,303
Operating income 78,799 77,802 150,688 147,540
Less: Retirement defined benefits expense—other than service costs (1,564) (1,906) (3,397) (3,782)
Increase in accounts, interest and dividends payable     31,784 43,530
Net cash provided by operating activities     108,271 174,102
Capital expenditures     (259,898) (210,325)
Net cash used in investing activities     (391,420) (387,521)
Hawaiian Electric Company, Inc. and Subsidiaries        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses 552,982 500,393 1,072,040 968,643
Operating income 55,144 56,482 106,513 106,843
Less: Retirement defined benefits expense—other than service costs (988) (1,435) (2,252) (2,858)
Other operation and maintenance 112,642 104,939 220,252 203,756
Net cash provided by operating activities     69,836 138,755
Capital expenditures     (213,220) (190,159)
Net cash used in investing activities     (195,346) (166,338)
Increase in accounts payable     18,284 39,716
Hawaiian Electric (parent only)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   356,273   688,176
Operating income   38,141   69,081
Less: Retirement defined benefits expense—other than service costs   (1,302)   (2,587)
Other operation and maintenance   69,659   135,652
Hawaii Electric Light Company, Inc. (HELCO)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   72,988   141,568
Operating income   8,722   19,124
Less: Retirement defined benefits expense—other than service costs   85   168
Other operation and maintenance   17,643   33,242
Maui Electric        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   71,132   138,899
Operating income   9,633   18,659
Less: Retirement defined benefits expense—other than service costs   (218)   (439)
Other operation and maintenance   17,637   34,862
American Savings Bank (ASB)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses 50,187 50,332 100,719 98,833
Operating income 26,917 24,997 51,804 49,352
Less: Retirement defined benefits expense—other than service costs 403 201 790 396
Compensation and employee benefits 23,655 24,541 48,095 47,583
Other expense 4,556 4,906 8,657 9,412
Electric utility        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses 552,982 500,393 1,072,040 968,643
Operating income 55,144 56,482 106,513 106,843
Bank        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses 50,187 50,332 100,719 98,833
Operating income 26,917 24,997 51,804 49,352
Other        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses 3,309 3,754 7,704 8,827
Operating income $ (3,262) (3,677) $ (7,629) (8,655)
As previously filed        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   556,385   1,080,085
Operating income   75,896   143,758
Less: Retirement defined benefits expense—other than service costs   0   0
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   501,828   971,501
Operating income   55,047   103,985
Less: Retirement defined benefits expense—other than service costs   0   0
Other operation and maintenance   106,374   206,614
As previously filed | Hawaiian Electric (parent only)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   357,575   690,763
Operating income   36,839   66,494
Less: Retirement defined benefits expense—other than service costs   0   0
Other operation and maintenance   70,961   138,239
As previously filed | Hawaii Electric Light Company, Inc. (HELCO)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   72,903   141,400
Operating income   8,807   19,292
Less: Retirement defined benefits expense—other than service costs   0   0
Other operation and maintenance   17,558   33,074
As previously filed | Maui Electric        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   71,350   139,338
Operating income   9,415   18,220
Less: Retirement defined benefits expense—other than service costs   0   0
Other operation and maintenance   17,855   35,301
As previously filed | American Savings Bank (ASB)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Compensation and employee benefits   24,742   47,979
Other expense   4,705   9,016
As previously filed | Electric utility        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   501,828   971,501
Operating income   55,047   103,985
As previously filed | Bank        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   50,533   99,229
Operating income   24,796   48,956
As previously filed | Other        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   4,024   9,355
Operating income   (3,947)   (9,183)
Adjustment | Hawaiian Electric (parent only)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase in accounts, interest and dividends payable       (11,921)
Net cash provided by operating activities       (11,921)
Capital expenditures       11,921
Net cash used in investing activities       11,921
Increase in accounts payable       (11,921)
Adjustment | ASU 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (1,906)   (3,782)
Operating income   1,906   3,782
Less: Retirement defined benefits expense—other than service costs   (1,906)   (3,782)
Adjustment | ASU 2017-07 | Hawaiian Electric Company, Inc. and Subsidiaries        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (1,435)   (2,858)
Operating income   1,435   2,858
Less: Retirement defined benefits expense—other than service costs   (1,435)   (2,858)
Other operation and maintenance   (1,435)   (2,858)
Adjustment | ASU 2017-07 | Hawaiian Electric (parent only)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (1,302)   (2,587)
Operating income   1,302   2,587
Less: Retirement defined benefits expense—other than service costs   (1,302)   (2,587)
Other operation and maintenance   (1,302)   (2,587)
Adjustment | ASU 2017-07 | Hawaii Electric Light Company, Inc. (HELCO)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   85   168
Operating income   (85)   (168)
Less: Retirement defined benefits expense—other than service costs   85   168
Other operation and maintenance   85   168
Adjustment | ASU 2017-07 | Maui Electric        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (218)   (439)
Operating income   218   439
Less: Retirement defined benefits expense—other than service costs   (218)   (439)
Other operation and maintenance   (218)   (439)
Adjustment | ASU 2017-07 | American Savings Bank (ASB)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Compensation and employee benefits   (201)   (396)
Other expense   201   396
Adjustment | ASU 2017-07 | Electric utility        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (1,435)   (2,858)
Operating income   1,435   2,858
Adjustment | ASU 2017-07 | Bank        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (201)   (396)
Operating income   201   396
Adjustment | ASU 2017-07 | Other        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Costs and expenses   (270)   (528)
Operating income   $ 270   $ 528