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Regulatory restrictions on net assets (Details) $ in Thousands	Dec. 31, 2017 USD ($)
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	$ 755,000
American Savings Bank (ASB)
Regulatory restrictions on net assets
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances	$ 441,000

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- Definition

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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://www.xbrl.org/2003/role/presentationRef
-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

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