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Fair value measurements (Details 4) (Fair Value, Inputs, Level 3, USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Fair value measurements |  |
Fair value | $ 4,959 |
Residential loan | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 4,028 |
Appraised value, weighted average rate (as a percent) | 81.00% | [1]
Residential loan | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) | 44.00% | [1]
Residential loan | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) | 96.00% | [1]
Home equity line of credit | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 172 |
Appraised value, weighted average rate (as a percent) | 50.00% | [1]
Home equity line of credit | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) | 46.00% | [1]
Home equity line of credit | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) | 50.00% | [1]
Commercial loan 2 | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 759 |
Fair value, weighted average rate (as a percent) | 60.00% | [1]
Commercial loan 2 | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Fair value of business assets (as a percent) | 31.00% | [1]
Commercial loan 2 | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Fair value of business assets (as a percent) | 91.00% | [1]
Real estate acquired in settlement of loans | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | $ 192 |
Appraised value, weighted average rate (as a percent) | 90.00% | [1]
Real estate acquired in settlement of loans | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) | 81.00% | [1]
Real estate acquired in settlement of loans | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) | 95.00% | [1]
[1] | Represent percent of outstanding principal balance.

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- Definition Fair Value Assumptions, Appraised Value, Weighted Average Rate + References No definition available. + Details
Name: | he_FairValueAssumptionsAppraisedValueWeightedAverageRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair Value Assumptions, Fair Value, Weighted Average Rate + References No definition available. + Details
Name: | he_FairValueAssumptionsFairValueWeightedAverageRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the appraised value used as an input to measure fair value, expressed as a percentage. + References No definition available. + Details
Name: | he_FairValueInputsAppraisedValueRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the fair value of business assets used as an input to measure fair value, expressed as a percentage. + References No definition available. + Details
Name: | he_FairValueInputsFairValueOfBusinessAssetsRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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