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Bank subsidiary (Details 11) | 9 Months Ended
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Sep. 30, 2012
Residential loan |
Troubled debt restructurings |
Period of deferral of principal repayments | 1 year
Period of temporary reduction in principal and/ or interest rate | 2 years
Land loans |
Troubled debt restructurings |
Period of interest-only monthly payment term loan | 3 years
Land loans | Minimum |
Troubled debt restructurings |
Extension of maturity date | 1 year
Land loans | Maximum |
Troubled debt restructurings |
Extension of maturity date | 3 years

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_
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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
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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
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Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
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
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Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Balance Type: | na
Period Type: | duration