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Regulatory restrictions on net assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Regulatory restrictions on net assets |  |  |  |
Distribution restrictions, percent of earnings in current year and 5 preceding years if capitalization rate is less than 35% | 80.00% |  |  |
Total capitalization rate of HEI's electric utility subsidiaries | 57.00% |  |  |
Common stock equity | $ 2,162,280 | $ 2,097,386 | $ 2,066,753 | $ 1,927,640
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Regulatory restrictions on net assets |  |  |  |
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances | 782,000 |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Regulatory restrictions on net assets |  |  |  |
Common stock equity | 1,957,641 | 1,845,283 | $ 1,799,787 | $ 1,728,325
American Savings Bank (ASB) |  |  |  |
Regulatory restrictions on net assets |  |  |  |
Common stock equity | 634,389 | $ 606,847 |  |
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances | $ 474,000 |  |  |

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- Definition Distribution Restrictions, Percent Of Earnings Available For Payment In Current Year And Five Preceding Years If Capitalization Is Less Than 35 Percent + References No definition available. + Details
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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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://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=27010918&loc=d3e74512-122707 Reference 2: 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=6877327&loc=d3e13212-122682 Reference 3: 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=6877327&loc=d3e13212-122682 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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