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Shareholders' equity (Tables) | 3 Months Ended
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Mar. 31, 2019
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, 2018 | $ | (24,423 | ) |  | $ | (436 | ) |  | $ | (25,751 | ) |  | $ | (50,610 | ) |  | $ | 99 |
Current period other comprehensive income (loss) | 9,439 |  |  | (403 | ) |  | 205 |  |  | 9,241 |  |  | 24 |
Balance, March 31, 2019 | $ | (14,984 | ) |  | $ | (839 | ) |  | $ | (25,546 | ) |  | $ | (41,369 | ) |  | $ | 123 |
Balance, December 31, 2017 | $ | (14,951 | ) |  | $ | — |  |  | $ | (26,990 | ) |  | $ | (41,941 | ) |  | $ | (1,219 | )
Current period other comprehensive income (loss) | (13,297 | ) |  | — |  |  | 524 |  |  | (12,773 | ) |  | 31 |
Balance, March 31, 2018 | $ | (28,248 | ) |  | $ | — |  |  | $ | (26,466 | ) |  | $ | (54,714 | ) |  | $ | (1,188 | )
Schedule of reclassifications out of accumulated other comprehensive income/(loss) | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  |
|  | Three months ended March 31 |  | Affected line item in the
(in thousands) |  | 2019 |  | 2018 |  | Statements of Income / Balance Sheets
HEI consolidated |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 2,503 |  |  | $ | 5,146 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (2,298 | ) |  | (4,622 | ) |  | See Note 9 for additional details
Total reclassifications |  | $ | 205 |  |  | $ | 524 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost |  | $ | 2,322 |  |  | $ | 4,653 |  |  | See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | (2,298 | ) |  | (4,622 | ) |  | See Note 9 for additional details
Total reclassifications |  | $ | 24 |  |  | $ | 31 |  |  |

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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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