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Shareholders' equity (Tables) | 3 Months Ended
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Mar. 31, 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) | (45,777) |  |  | 1,562 |  |  | 199 |  |  | (44,016) |  |  |  |  | 34 |  |  |
Balance, March 31, 2021 | $ | (25,791) |  |  | $ | (1,801) |  |  | $ | (17,688) |  |  | $ | (45,280) |  |  |  |  | $ | (2,885) |  |  |
Balance, December 31, 2019 | $ | 2,481 |  |  | $ | (1,613) |  |  | $ | (20,907) |  |  | $ | (20,039) |  |  |  |  | $ | (1,279) |  |  |
Current period other comprehensive income (loss) | 19,448 |  |  | (1,784) |  |  | 548 |  |  | 18,212 |  |  |  |  | 26 |  |  |
Balance, March 31, 2020 | $ | 21,929 |  |  | $ | (3,397) |  |  | $ | (20,359) |  |  | $ | (1,827) |  |  |  |  | $ | (1,253) |  |  |
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 |  |  |  | 2021 |  | 2020 |
(in thousands) |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  |  |  |  |  | $ | (387) |  |  | $ | — |  |  | 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 |  |  |  |  |  | 6,010 |  |  | 5,706 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  |  |  |  |  | (5,811) |  |  | (5,158) |  |  | See Note 8 for additional details
Total reclassifications |  |  |  |  |  | $ | (188) |  |  | $ | 548 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  |  |  |  |  | $ | 5,845 |  |  | $ | 5,184 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  |  |  |  |  | (5,811) |  |  | (5,158) |  |  | See Note 8 for additional details
Total reclassifications |  |  |  |  |  | $ | 34 |  |  | $ | 26 |  |  |

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