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Shareholders' equity - Accumulated other comprehensive income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 2,390,884 | $ 2,337,502
Current period other comprehensive income (loss) | (117,159) | (44,016)
Ending balance | 2,303,642 | 2,321,293
AOCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (52,533) | (1,264)
Current period other comprehensive income (loss) | (117,159) | (44,016)
Ending balance | (169,692) | (45,280)
Net unrealized gains (losses) on securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (32,037) | 19,986
Current period other comprehensive income (loss) | (120,407) | (45,777)
Ending balance | (152,444) | (25,791)
Unrealized gains (losses) on derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (3,638) | (3,363)
Current period other comprehensive income (loss) | 3,072 | 1,562
Ending balance | (566) | (1,801)
Retirement benefit plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (16,858) | (17,887)
Current period other comprehensive income (loss) | 176 | 199
Ending balance | (16,682) | (17,688)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 2,261,899 | 2,141,918
Current period other comprehensive income (loss) | 51 | 34
Ending balance | 2,276,884 | 2,157,385
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (3,280) | (2,919)
Current period other comprehensive income (loss) | 51 | 34
Ending balance | (3,229) | (2,885)
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (3,280) | (2,919)
Current period other comprehensive income (loss) | 51 | 34
Ending balance | $ (3,229) | $ (2,885)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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