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Basis of presentation (Tables) | 3 Months Ended
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Mar. 31, 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:
(in thousands) | As previously filed | Adjustment from adoption of ASU No. 2017-07 | As currently reported
Three months ended March 31, 2017 |  |  |
HEI Condensed Consolidated Income Statement |
Expenses |  |  |
Electric utility | $ | 469,673 |  | $ | (1,423 | ) | $ | 468,250 |
Bank | 48,696 |  | (195 | ) | 48,501 |
Other | 5,331 |  | (258 | ) | 5,073 |
Total expenses | 523,700 |  | (1,876 | ) | 521,824 |
Operating income |  |  |
Electric utility | 48,938 |  | 1,423 |  | 50,361 |
Bank | 24,160 |  | 195 |  | 24,355 |
Other | (5,236 | ) | 258 |  | (4,978 | )
Total operating income | 67,862 |  | 1,876 |  | 69,738 |
Retirement defined benefits expense--other than service costs | — |  | (1,876 | ) | (1,876 | )
Hawaiian Electric Condensed Consolidated Income Statement
Other operation and maintenance | 100,240 |  | (1,423 | ) | 98,817 |
Total expense | 469,673 |  | (1,423 | ) | 468,250 |
Operating income | 48,938 |  | 1,423 |  | 50,361 |
Retirement defined benefits expense--other than service costs | — |  | (1,423 | ) | (1,423 | )
Hawaiian Electric Condensed Consolidating Income Statement (in Note 3) |  |  |
Hawaiian Electric (parent only) |  |  |
Other operation and maintenance | 67,278 |  | (1,285 | ) | 65,993 |
Total expense | 333,188 |  | (1,285 | ) | 331,903 |
Operating income | 29,655 |  | 1,285 |  | 30,940 |
Retirement defined benefits expense--other than service costs | — |  | (1,285 | ) | (1,285 | )
Hawaii Electric Light |  |  |
Other operation and maintenance | 15,516 |  | 83 |  | 15,599 |
Total expense | 68,497 |  | 83 |  | 68,580 |
Operating income | 10,485 |  | (83 | ) | 10,402 |
Retirement defined benefits expense--other than service costs | — |  | 83 |  | 83 |
Maui Electric |  |  |
Other operation and maintenance | 17,446 |  | (221 | ) | 17,225 |
Total expense | 67,988 |  | (221 | ) | 67,767 |
Operating income | 8,805 |  | 221 |  | 9,026 |
Retirement defined benefits expense--other than service costs | — |  | (221 | ) | (221 | )
ASB Statements of Income Data (in Note 4) |  |
Compensation and employee benefits | 23,237 |  | (195 | ) | 23,042 |
Other expense | 4,311 |  | 195 |  | 4,506 |

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