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Shareholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2020 | $ | 19,986 |  |  | $ | (3,363) |  |  | $ | (17,887) |  |  | $ | (1,264) |  |  |  |  | $ | (2,919) |  |  |
Current period other comprehensive income (loss) | (28,801) |  |  | 861 |  |  | 396 |  |  | (27,544) |  |  |  |  | 69 |  |  |
Balance, June 30, 2021 | $ | (8,815) |  |  | $ | (2,502) |  |  | $ | (17,491) |  |  | $ | (28,808) |  |  |  |  | $ | (2,850) |  |  |
Balance, December 31, 2019 | $ | 2,481 |  |  | $ | (1,613) |  |  | $ | (20,907) |  |  | $ | (20,039) |  |  |  |  | $ | (1,279) |  |  |
Current period other comprehensive income (loss) | 18,783 |  |  | (1,982) |  |  | 1,079 |  |  | 17,880 |  |  |  |  | 51 |  |  |
Balance, June 30, 2020 | $ | 21,264 |  |  | $ | (3,595) |  |  | $ | (19,828) |  |  | $ | (2,159) |  |  |  |  | $ | (1,228) |  |  |
Schedule of reclassifications out of accumulated other comprehensive income/(loss) | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  | Affected line item in the Statements of Income / Balance Sheets
|  | Three months ended June 30 |  | Six months ended June 30 |
|  | 2021 |  | 2020 |  | 2021 |  | 2020 |
(in thousands) |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  | $ | — |  |  | $ | (1,638) |  |  | $ | (387) |  |  | $ | (1,638) |  |  | Gain on sale of investment securities, net
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 6,008 |  |  | 5,690 |  |  | 12,018 |  |  | 11,396 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (5,811) |  |  | (5,159) |  |  | (11,622) |  |  | (10,317) |  |  | See Note 8 for additional details
Total reclassifications |  | $ | 197 |  |  | $ | (1,107) |  |  | $ | 9 |  |  | $ | (559) |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 5,846 |  |  | $ | 5,184 |  |  | $ | 11,691 |  |  | $ | 10,368 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (5,811) |  |  | (5,159) |  |  | (11,622) |  |  | (10,317) |  |  | See Note 8 for additional details
Total reclassifications |  | $ | 35 |  |  | $ | 25 |  |  | $ | 69 |  |  | $ | 51 |  |  |

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