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Shareholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2022 | $ | (328,904) |  |  | $ | 1,991 |  |  | $ | (9,115) |  |  | $ | (336,028) |  |  |  |  | $ | 2,861 |  |  |
Current period other comprehensive income (loss) | (21,330) |  |  | (827) |  |  | 161 |  |  | (21,996) |  |  |  |  | (166) |  |  |
Balance, September 30, 2023 | $ | (350,234) |  |  | $ | 1,164 |  |  | $ | (8,954) |  |  | $ | (358,024) |  |  |  |  | $ | 2,695 |  |  |
Balance, December 31, 2021 | $ | (32,037) |  |  | $ | (3,638) |  |  | $ | (16,858) |  |  | $ | (52,533) |  |  |  |  | $ | (3,280) |  |  |
Current period other comprehensive income (loss) | (308,229) |  |  | 6,561 |  |  | 657 |  |  | (301,011) |  |  |  |  | 210 |  |  |
Balance, September 30, 2022 | $ | (340,266) |  |  | $ | 2,923 |  |  | $ | (16,201) |  |  | $ | (353,544) |  |  |  |  | $ | (3,070) |  |  |
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 September 30 |  | Nine months ended September 30 |
(in thousands) |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on available-for sale investment securities - amortization of unrealized holding losses on held-to-maturity securities |  | $ | 3,699 |  |  | $ | — |  |  | $ | 11,065 |  |  | $ | — |  |  | Bank revenues
Net realized losses (gains) on derivatives qualifying as cash flow hedges |  | (47) |  |  | 53 |  |  | (143) |  |  | 161 |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost |  | (446) |  |  | 5,606 |  |  | (1,160) |  |  | 10,229 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 470 |  |  | (5,303) |  |  | 1,321 |  |  | (9,572) |  |  | See Note 9 for additional details
Total reclassifications |  | $ | 3,676 |  |  | $ | 356 |  |  | $ | 11,083 |  |  | $ | 818 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost |  | $ | (547) |  |  | $ | 5,411 |  |  | $ | (1,487) |  |  | $ | 9,782 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 470 |  |  | (5,303) |  |  | 1,321 |  |  | (9,572) |  |  | See Note 9 for additional details
Total reclassifications |  | $ | (77) |  |  | $ | 108 |  |  | $ | (166) |  |  | $ | 210 |  |  |

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