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Shareholders' equity (Tables) | 3 Months Ended
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Mar. 31, 2024
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
| HEI Consolidated |  | Hawaiian Electric Consolidated
(in thousands) | Net unrealized gains (losses) on securities |  | Unrealized gains (losses) on derivatives |  | Retirement benefit plans |  | AOCI |  | AOCI-Retirement benefit plans
Balance, December 31, 2023 | $ | (282,963) |  |  | $ | 1,638 |  |  | $ | (8,025) |  |  | $ | (289,350) |  |  | $ | 2,849 |
Current period other comprehensive income (loss) | (10,503) |  |  | 692 |  |  | 10 |  |  | (9,801) |  |  | (49) |
Balance, March 31, 2024 | $ | (293,466) |  |  | $ | 2,330 |  |  | $ | (8,015) |  |  | $ | (299,151) |  |  | $ | 2,800 |
Balance, December 31, 2022 | $ | (328,904) |  |  | $ | 1,991 |  |  | $ | (9,115) |  |  | $ | (336,028) |  |  | $ | 2,861 |
Current period other comprehensive income (loss) | 20,282 |  |  | 138 |  |  | 68 |  |  | 20,488 |  |  | (45) |
Balance, March 31, 2023 | $ | (308,622) |  |  | $ | 2,129 |  |  | $ | (9,047) |  |  | $ | (315,540) |  |  | $ | 2,816 |
Schedule of Reclassification out of AOCI | Reclassifications out of AOCI were as follows:
|  |  |  |  | Amount reclassified from AOCI |  | Affected line item in the Statements of Income / Balance Sheets
|  |  |  | Three months ended March 31 |
(in thousands) |  |  |  |  |  | 2024 |  | 2023 |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Amortization of unrealized holding losses on held-to-maturity securities |  |  |  |  |  | $ | 3,086 |  |  | $ | 3,677 |  |  | Bank revenues
Net realized gains on derivatives qualifying as cash flow hedges |  |  |  |  |  | (48) |  |  | (48) |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost |  |  |  |  |  | (449) |  |  | (357) |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  |  |  |  |  | 459 |  |  | 425 |  |  | See Note 9 for additional details
Total reclassifications |  |  |  |  |  | $ | 3,048 |  |  | $ | 3,697 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost |  |  |  |  |  | $ | (508) |  |  | $ | (470) |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  |  |  |  |  | 459 |  |  | 425 |  |  | See Note 9 for additional details
Total reclassifications |  |  |  |  |  | $ | (49) |  |  | $ | (45) |  |  |

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