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Shareholders' equity (Tables) | 3 Months Ended
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Mar. 31, 2022
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, 2021 | $ | (32,037) |  |  | $ | (3,638) |  |  | $ | (16,858) |  |  | $ | (52,533) |  |  |  |  | $ | (3,280) |  |  |
Current period other comprehensive income (loss) | (120,407) |  |  | 3,072 |  |  | 176 |  |  | (117,159) |  |  |  |  | 51 |  |  |
Balance, March 31, 2022 | $ | (152,444) |  |  | $ | (566) |  |  | $ | (16,682) |  |  | $ | (169,692) |  |  |  |  | $ | (3,229) |  |  |
Balance, December 31, 2020 | $ | 19,986 |  |  | $ | (3,363) |  |  | $ | (17,887) |  |  | $ | (1,264) |  |  |  |  | $ | (2,919) |  |  |
Current period other comprehensive income (loss) | (45,777) |  |  | 1,562 |  |  | 199 |  |  | (44,016) |  |  |  |  | 34 |  |  |
Balance, March 31, 2021 | $ | (25,791) |  |  | $ | (1,801) |  |  | $ | (17,688) |  |  | $ | (45,280) |  |  |  |  | $ | (2,885) |  |  |
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 March 31 |
(in thousands) |  |  |  |  |  | 2022 |  | 2021 |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  |  |  |  |  | $ | — |  |  | $ | (387) |  |  | Gain on sale of investment securities, net
Net realized losses on derivatives qualifying as cash flow hedges |  |  |  |  |  | 55 |  |  | — |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  |  |  |  |  | 4,501 |  |  | 6,010 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  |  |  |  |  | (4,325) |  |  | (5,811) |  |  | See Note 8 for additional details
Total reclassifications |  |  |  |  |  | $ | 231 |  |  | $ | (188) |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  |  |  |  |  | $ | 4,376 |  |  | $ | 5,845 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  |  |  |  |  | (4,325) |  |  | (5,811) |  |  | See Note 8 for additional details
Total reclassifications |  |  |  |  |  | $ | 51 |  |  | $ | 34 |  |  |

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