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Shareholders' equity (Tables) | 9 Months Ended
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Sep. 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) | (40,308) |  |  | 1,009 |  |  | 450 |  |  | (38,849) |  |  |  |  | 175 |  |  |
Balance, September 30, 2021 | $ | (20,322) |  |  | $ | (2,354) |  |  | $ | (17,437) |  |  | $ | (40,113) |  |  |  |  | $ | (2,744) |  |  |
Balance, December 31, 2019 | $ | 2,481 |  |  | $ | (1,613) |  |  | $ | (20,907) |  |  | $ | (20,039) |  |  |  |  | $ | (1,279) |  |  |
Current period other comprehensive income (loss) | 19,767 |  |  | (2,129) |  |  | 1,682 |  |  | 19,320 |  |  |  |  | 99 |  |  |
Balance, September 30, 2020 | $ | 22,248 |  |  | $ | (3,742) |  |  | $ | (19,225) |  |  | $ | (719) |  |  |  |  | $ | (1,180) |  |  |
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 September 30 |  | Nine months ended September 30 |
|  | 2021 |  | 2020 |  | 2021 |  | 2020 |
(in thousands) |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  | $ | — |  |  | $ | — |  |  | $ | (387) |  |  | $ | (1,638) |  |  | Gain on sale of investment securities, net
Net realized losses on derivatives qualifying as cash flow hedges |  | 9 |  |  | — |  |  | 9 |  |  | — |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 2,853 |  |  | 6,324 |  |  | 14,871 |  |  | 17,720 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (2,799) |  |  | (5,721) |  |  | (14,421) |  |  | (16,038) |  |  | See Note 8 for additional details
Total reclassifications |  | $ | 63 |  |  | $ | 603 |  |  | $ | 72 |  |  | $ | 44 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 2,905 |  |  | $ | 5,769 |  |  | $ | 14,596 |  |  | $ | 16,137 |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (2,799) |  |  | (5,721) |  |  | (14,421) |  |  | (16,038) |  |  | See Note 8 for additional details
Total reclassifications |  | $ | 106 |  |  | $ | 48 |  |  | $ | 175 |  |  | $ | 99 |  |  |

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