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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2015 | $ | (1,872 | ) |  | $ | (54 | ) |  | $ | (24,336 | ) |  | $ | (26,262 | ) |  | $ | — |  |  | $ | 925 |  |  | $ | 925 |
Current period other comprehensive loss, net of taxes | (6,059 | ) |  | (400 | ) |  | (408 | ) |  | (6,867 | ) |  | (454 | ) |  | (793 | ) |  | (1,247 | )
Balance, December 31, 2016 | (7,931 | ) |  | (454 | ) |  | (24,744 | ) |  | (33,129 | ) |  | (454 | ) |  | 132 |  |  | (322 | )
Current period other comprehensive income (loss), net of taxes | (4,370 | ) |  | 454 |  |  | 2,544 |  |  | (1,372 | ) |  | 454 |  |  | (1,142 | ) |  | (688 | )
Reclass of AOCI for tax rate reduction impact | (2,650 | ) |  | — |  |  | (4,790 | ) |  | (7,440 | ) |  | — |  |  | (209 | ) |  | (209 | )
Balance, December 31, 2017 | (14,951 | ) |  | — |  |  | (26,990 | ) |  | (41,941 | ) |  | — |  |  | (1,219 | ) |  | (1,219 | )
Current period other comprehensive income (loss), net of taxes | (9,472 | ) |  | (436 | ) |  | 1,239 |  |  | (8,669 | ) |  | — |  |  | 1,318 |  |  | 1,318 |
Balance, December 31, 2018 | $ | (24,423 | ) |  | $ | (436 | ) |  | $ | (25,751 | ) |  | $ | (50,610 | ) |  | $ | — |  |  | $ | 99 |  |  | $ | 99 |
Reclassification Out of Accumulated Other Comprehensive Income | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  | Affected line item in the Statement of
Years ended December 31 |  | 2018 |  | 2017 |  | 2016 |  | Income/Balance Sheet
(in thousands) |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |
Net realized gains on securities included in net income |  | $ | — |  |  | $ | — |  |  | $ | (360 | ) |  | Revenues-bank (gains on sale of investment securities, net)
Derivatives qualifying as cash flow hedges: |  |  |  |  |  |  |  |  |  |
Window forward contracts |  | — |  |  | 454 |  |  | (173 | ) |  | Property, plant and equipment-electric utilities (2017); Revenues-electric utilities (gains on window forward contracts (2016)
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 |  | 21,015 |  |  | 15,737 |  |  | 14,518 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 8,325 |  |  | (78,724 | ) |  | 28,584 |  |  | See Note 9 for additional details
Total reclassifications |  | $ | 29,340 |  |  | $ | (62,533 | ) |  | $ | 42,623 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Derivatives qualifying as cash flow hedges |  |  |  |  |  |  |  |
Window forward contracts |  | $ | — |  |  | $ | 454 |  |  | $ | (173 | ) |  | Property, plant and equipment (2017); Revenues (gains on window forward contracts (2016))
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | 19,012 |  |  | 14,477 |  |  | 13,254 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 8,325 |  |  | (78,724 | ) |  | 28,584 |  |  | See Note 9 for additional details
Total reclassifications |  | $ | 27,337 |  |  | $ | (63,793 | ) |  | $ | 41,665 |  |  |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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