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Shareholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2017
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 |  | Unrealized gains (losses) on derivatives |  | Retirement benefit plans |  | AOCI
Balance, December 31, 2016 | $ | (7,931 | ) |  | $ | (454 | ) |  | $ | (24,744 | ) |  | $ | (33,129 | ) |  | $ | (454 | ) |  | $ | 132 |  |  | $ | (322 | )
Current period other comprehensive income | 2,244 |  |  | 454 |  |  | 657 |  |  | 3,355 |  |  | 454 |  |  | 45 |  |  | 499 |
Balance, June 30, 2017 | $ | (5,687 | ) |  | $ | — |  |  | $ | (24,087 | ) |  | $ | (29,774 | ) |  | $ | — |  |  | $ | 177 |  |  | $ | 177 |
Balance, December 31, 2015 | $ | (1,872 | ) |  | $ | (54 | ) |  | $ | (24,336 | ) |  | $ | (26,262 | ) |  | $ | — |  |  | $ | 925 |  |  | $ | 925 |
Current period other comprehensive income | 9,984 |  |  | 311 |  |  | 613 |  |  | 10,908 |  |  | 257 |  |  | 4 |  |  | 261 |
Balance, June 30, 2016 | $ | 8,112 |  |  | $ | 257 |  |  | $ | (23,723 | ) |  | $ | (15,354 | ) |  | $ | 257 |  |  | $ | 929 |  |  | $ | 1,186 |
Schedule of reclassifications out of accumulated other comprehensive income/(loss) | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  | Amount reclassified from AOCI |  |
|  | Three months ended June 30 |  | Six months ended June 30 |  | Affected line item in the
(in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | Statements of Income / Balance Sheets
HEI consolidated |  |  |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  | $ | — |  |  | $ | (360 | ) |  | $ | — |  |  | $ | (360 | ) |  | Revenues-bank (net gains on sales of securities)
Derivatives qualifying as cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Window forward contracts |  | — |  |  | — |  |  | 454 |  |  | — |  |  | Construction in progress-electric utilities (losses on window forward contracts - see Note 3 for additional details)
Interest rate contracts (settled in 2011) |  | — |  |  | — |  |  | — |  |  | 54 |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 3,930 |  |  | 3,698 |  |  | 7,851 |  |  | 7,236 |  |  | See Note 7 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (3,581 | ) |  | (3,401 | ) |  | (7,194 | ) |  | (6,623 | ) |  | See Note 7 for additional details
Total reclassifications |  | $ | 349 |  |  | $ | (63 | ) |  | $ | 1,111 |  |  | $ | 307 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Derivatives qualifying as cash flow hedges: |  |  |  |  |  |  |  |  |  |
Window forward contracts |  | $ | — |  |  | $ | — |  |  | $ | 454 |  |  | $ | — |  |  | Construction in progress (losses on window forward contracts - see Note 3 for additional details)
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 3,621 |  |  | 3,391 |  |  | 7,239 |  |  | 6,627 |  |  | See Note 7 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (3,581 | ) |  | (3,401 | ) |  | (7,194 | ) |  | (6,623 | ) |  | See Note 7 for additional details
Total reclassifications |  | $ | 40 |  |  | $ | (10 | ) |  | $ | 499 |  |  | $ | 4 |  |  |

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