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Summary of significant accounting policies - Changes In Accounting Standard Updates (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 $ 2,527,493 $ 2,209,392 $ 2,024,816
Operating income $ 84,604 $ 98,064 $ 78,799 $ 71,889 $ 87,220 $ 111,473 $ 77,802 $ 69,738 333,356 346,233 355,838
Retirement defined benefits expense—other than service costs                 (5,962) (7,942) (7,663)
Electric utility                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 2,304,864 1,994,042 1,804,298
Operating income                 241,661 263,524 290,070
Bank                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 206,040 198,104 197,697
Operating income                 108,235 99,536 88,227
Other                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 16,589 17,246 22,821
Operating income                 (16,540) (16,827) (22,459)
As previously filed                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   2,217,334 2,032,479
Operating income                   338,291 348,175
Retirement defined benefits expense—other than service costs                   0 0
As previously filed | Electric utility                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   2,000,045 1,809,900
Operating income                   257,521 284,468
As previously filed | Bank                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   198,924 198,572
Operating income                   98,716 87,352
As previously filed | Other                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   18,365 24,007
Operating income                   (17,946) (23,645)
ASU 2017-07 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (7,942) (7,663)
Operating income                   7,942 7,663
Retirement defined benefits expense—other than service costs                   (7,942) (7,663)
ASU 2017-07 | Adjustment | Electric utility                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (6,003) (5,602)
Operating income                   6,003 5,602
ASU 2017-07 | Adjustment | Bank                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (820) (875)
Operating income                   820 875
ASU 2017-07 | Adjustment | Other                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (1,119) (1,186)
Operating income                   1,119 1,186
Hawaiian Electric Company, Inc. and Subsidiaries                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 2,304,864 1,994,042 1,804,298
Operating income $ 61,112 $ 74,036 $ 55,144 $ 51,369 $ 68,184 $ 88,497 $ 56,482 $ 50,361 241,661 263,524 290,070
Retirement defined benefits expense—other than service costs                 (3,631) (6,003) (5,602)
Other operation and maintenance                 461,491 411,907 399,931
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   2,000,045 1,809,900
Operating income                   257,521 284,468
Retirement defined benefits expense—other than service costs                   0 0
Other operation and maintenance                   417,910 405,533
Hawaiian Electric Company, Inc. and Subsidiaries | ASU 2017-07 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (6,003) (5,602)
Operating income                   6,003 5,602
Retirement defined benefits expense—other than service costs                   (6,003) (5,602)
Other operation and maintenance                   (6,003) (5,602)
Hawaiian Electric                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 1,639,275 1,420,606 1,272,187
Operating income                 163,275 177,898 202,197
Retirement defined benefits expense—other than service costs                 (2,649) (5,049) (5,058)
Other operation and maintenance                 313,346 274,391 268,118
Hawaiian Electric | As previously filed                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   1,425,655 1,277,245
Operating income                   172,849 197,139
Retirement defined benefits expense—other than service costs                   0 0
Other operation and maintenance                   279,440 273,176
Hawaiian Electric | ASU 2017-07 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (5,049) (5,058)
Operating income                   5,049 5,058
Retirement defined benefits expense—other than service costs                   (5,049) (5,058)
Other operation and maintenance                   (5,049) (5,058)
HELCO                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   287,775 267,142
Operating income                   45,692 44,243
Retirement defined benefits expense—other than service costs                   (93) 319
Other operation and maintenance                   66,184 64,216
HELCO | As previously filed                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   287,868 266,823
Operating income                   45,599 44,562
Retirement defined benefits expense—other than service costs                   0 0
Other operation and maintenance                   66,277 63,897
HELCO | ASU 2017-07 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (93) 319
Operating income                   93 (319)
Retirement defined benefits expense—other than service costs                   (93) 319
Other operation and maintenance                   (93) 319
MECO                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   285,661 264,969
Operating income                   40,017 43,736
Retirement defined benefits expense—other than service costs                   (861) (863)
Other operation and maintenance                   71,332 67,597
MECO | As previously filed                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   286,522 265,832
Operating income                   39,156 42,873
Retirement defined benefits expense—other than service costs                   0 0
Other operation and maintenance                   72,193 68,460
MECO | ASU 2017-07 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                   (861) (863)
Operating income                   861 863
Retirement defined benefits expense—other than service costs                   (861) (863)
Other operation and maintenance                   (861) (863)
American Savings Bank (ASB)                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Total expenses                 206,040 198,104 197,697
Operating income                 108,235 99,536 88,227
Retirement defined benefits expense—other than service costs                 (1,657) (820) (875)
Compensation and employee benefits                 98,387 94,931 89,242
Other expense                 $ 17,238 20,144 19,362
American Savings Bank (ASB) | As previously filed                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Compensation and employee benefits                   95,751 90,117
Other expense                   19,324 18,487
American Savings Bank (ASB) | ASU 2017-07 | Adjustment                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Compensation and employee benefits                   (820) (875)
Other expense                   $ 820 $ 875