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Bank segment - Troubled debt restructuring that subsequently defaulted (Details) - Jun. 30, 2014 $ in Thousands | USD ($) contract | USD ($) contract
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 1 | 1
Recorded investment | $ 390 | $ 390
Residential 1-4 family |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 1 | 1
Recorded investment | $ 390 | $ 390

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- Definition Financing Receivable, Troubled Debt Restructuring, Contract That Subsequently Defaulted, Value + References No definition available. + Details
Name: | he_FinancingReceivableTroubledDebtRestructuringContractThatSubsequentlyDefaultedValue
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Financing Receivable, Troubled Debt Restructuring, Contracts That Subsequently Defaulted, Number + References No definition available. + Details
Name: | he_FinancingReceivableTroubledDebtRestructuringContractsThatSubsequentlyDefaultedNumber
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=he_Residential1To4FamilyPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |