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Bank subsidiary (Details 11) | 6 Months Ended
--- | ---
Jun. 30, 2012 Y
Residential loan |
Troubled debt restructurings |
Period of deferral of principal repayments (in years) | 1
Period of temporary reduction in principal and/ or interest rate (in years) | 2
Land loans |
Troubled debt restructurings |
Period of interest-only monthly payment term loan (in years) | 3
Land loans | Minimum |
Troubled debt restructurings |
Extension of maturity date (in years) | 1
Land loans | Maximum |
Troubled debt restructurings |
Extension of maturity date (in years) | 3

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

X
- Definition Represents the period of temporary reduction in principal and/ or interest rate under the troubled debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsPeriodOfDeferralOfPrincipalRepayments
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
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:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of temporary reduction in principal and/ or interest rate under the troubled debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsPeriodOfTemporaryReductionInPrincipalAndInterest
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
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