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Fair value measurements Additional Information (Details) (American Savings Bank (ASB), USD $)	Dec. 31, 2014	Dec. 31, 2013
Carrying or notional amount
Fair value measurements on a recurring and nonrecurring basis
Notional amount of loans serviced	$ 1,400,000,000he_PrincipalAmountOfLoansServiced / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember	$ 1,400,000,000he_PrincipalAmountOfLoansServiced / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember
Estimated fair value
Fair value measurements on a recurring and nonrecurring basis
Servicing rights on loans	$ 14,500,000us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember	$ 15,700,000us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember

X

- Definition

Represents the aggregate principal amount of loans serviced on behalf of others.

+ References

No definition available.

+ Details

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- Details

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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