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Basis of presentation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Impact of Prior Period Financial Statements of the Adoption of ASU 2017-07 | The following table summarizes the impact to the prior period financial statements of the adoption of ASU No. 2017-07:
| Three months ended June 30, 2017 |  | Six months ended June 30, 2017
(in thousands) | As previously filed | Adjustment from adoption of ASU No. 2017-07 | As currently reported |  | As previously filed | Adjustment from adoption of ASU No. 2017-07 | As currently reported
HEI Condensed Consolidated Income Statement |  |  |  |  |
Expenses |  |  |  |  |  |  |
Electric utility | $ | 501,828 |  | $ | (1,435 | ) | $ | 500,393 |  |  | $ | 971,501 |  | $ | (2,858 | ) | $ | 968,643 |
Bank | 50,533 |  | (201 | ) | 50,332 |  |  | 99,229 |  | (396 | ) | 98,833 |
Other | 4,024 |  | (270 | ) | 3,754 |  |  | 9,355 |  | (528 | ) | 8,827 |
Total expenses | 556,385 |  | (1,906 | ) | 554,479 |  |  | 1,080,085 |  | (3,782 | ) | 1,076,303 |
Operating income |  |  |  |  |  |  |
Electric utility | 55,047 |  | 1,435 |  | 56,482 |  |  | 103,985 |  | 2,858 |  | 106,843 |
Bank | 24,796 |  | 201 |  | 24,997 |  |  | 48,956 |  | 396 |  | 49,352 |
Other | (3,947 | ) | 270 |  | (3,677 | ) |  | (9,183 | ) | 528 |  | (8,655 | )
Total operating income | 75,896 |  | 1,906 |  | 77,802 |  |  | 143,758 |  | 3,782 |  | 147,540 |
Retirement defined benefits expense--other than service costs | — |  | (1,906 | ) | (1,906 | ) |  | — |  | (3,782 | ) | (3,782 | )
Hawaiian Electric Condensed Consolidated Income Statement |  |  |  |
Other operation and maintenance | 106,374 |  | (1,435 | ) | 104,939 |  |  | 206,614 |  | (2,858 | ) | 203,756 |
Total expense | 501,828 |  | (1,435 | ) | 500,393 |  |  | 971,501 |  | (2,858 | ) | 968,643 |
Operating income | 55,047 |  | 1,435 |  | 56,482 |  |  | 103,985 |  | 2,858 |  | 106,843 |
Retirement defined benefits expense--other than service costs | — |  | (1,435 | ) | (1,435 | ) |  | — |  | (2,858 | ) | (2,858 | )
Hawaiian Electric Condensed Consolidating Income Statement (in Note 3) |  |  |  |  |  |  |
Hawaiian Electric (parent only) |  |  |  |  |  |  |
Other operation and maintenance | 70,961 |  | (1,302 | ) | 69,659 |  |  | 138,239 |  | (2,587 | ) | 135,652 |
Total expense | 357,575 |  | (1,302 | ) | 356,273 |  |  | 690,763 |  | (2,587 | ) | 688,176 |
Operating income | 36,839 |  | 1,302 |  | 38,141 |  |  | 66,494 |  | 2,587 |  | 69,081 |
Retirement defined benefits expense--other than service costs | — |  | (1,302 | ) | (1,302 | ) |  | — |  | (2,587 | ) | (2,587 | )
Hawaii Electric Light |  |  |  |  |  |  |
Other operation and maintenance | 17,558 |  | 85 |  | 17,643 |  |  | 33,074 |  | 168 |  | 33,242 |
Total expense | 72,903 |  | 85 |  | 72,988 |  |  | 141,400 |  | 168 |  | 141,568 |
Operating income | 8,807 |  | (85 | ) | 8,722 |  |  | 19,292 |  | (168 | ) | 19,124 |
Retirement defined benefits expense--other than service costs | — |  | 85 |  | 85 |  |  | — |  | 168 |  | 168 |
Maui Electric |  |  |  |  |  |  |
Other operation and maintenance | 17,855 |  | (218 | ) | 17,637 |  |  | 35,301 |  | (439 | ) | 34,862 |
Total expense | 71,350 |  | (218 | ) | 71,132 |  |  | 139,338 |  | (439 | ) | 138,899 |
Operating income | 9,415 |  | 218 |  | 9,633 |  |  | 18,220 |  | 439 |  | 18,659 |
Retirement defined benefits expense--other than service costs | — |  | (218 | ) | (218 | ) |  | — |  | (439 | ) | (439 | )
ASB Statements of Income Data (in Note 4) |  |  |  |  |  |
Compensation and employee benefits | 24,742 |  | (201 | ) | 24,541 |  |  | 47,979 |  | (396 | ) | 47,583 |
Other expense | 4,705 |  | 201 |  | 4,906 |  |  | 9,016 |  | 396 |  | 9,412 |

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