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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

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