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Bank subsidiary (Details 12) (Land loans) | 9 Months Ended
--- | ---
Sep. 30, 2013
Troubled debt restructurings |
Period of interest-only monthly payment term loan | 3 years
Maximum |
Troubled debt restructurings |
Extension of maturity date | 5 years

X
- Definition Represents the extension of maturity period of troubled debt under the troubled debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsIncreaseInMaturityPeriod
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of interest-only monthly payment term loan under the troubled debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsPeriodOfInterestOnlyMonthlyPaymentTermLoan
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration