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Fair value measurements (Details 3) (Fair Value, Inputs, Level 3, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Fair value measurements |  |
Fair value | $ 2,494 us-gaap_AssetsFairValueDisclosure | $ 2,445 us-gaap_AssetsFairValueDisclosure
Residential loan | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 2,377 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 2,297 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value, selling cost | 7.00%he_FairValueAssumptionsSellingCostPercent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 7.00%he_FairValueAssumptionsSellingCostPercent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value, weighted average rate (as a percent) | 78.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 83.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Residential loan | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) | 39.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 39.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Residential loan | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) | 99.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 99.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Home equity line of credit | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 3 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 3 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value, selling cost | 7.00%he_FairValueAssumptionsSellingCostPercent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 7.00%he_FairValueAssumptionsSellingCostPercent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value, weighted average rate (as a percent) | 7.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 7.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Commercial loans | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 114 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 145 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Fair value, weighted average rate (as a percent) | 88.00%he_FairValueAssumptionsFairValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 91.00%he_FairValueAssumptionsFairValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Real estate acquired in settlement of loans | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | $ 665 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | $ 288 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value, selling cost | 7.00%he_FairValueAssumptionsSellingCostPercent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 7.00%he_FairValueAssumptionsSellingCostPercent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value (as a percent) | 100.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 100.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Appraised value, weighted average rate (as a percent) | 100.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 100.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateAcquiredInSettlementOfLoansMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember

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- Definition Fair Value Assumptions, Appraised Value, Weighted Average Rate + References No definition available. + Details
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- Definition Fair Value Assumptions, Fair Value, Weighted Average Rate + References No definition available. + Details
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- Definition Fair Value Assumptions, Selling Cost, Percent + References No definition available. + Details
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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
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Namespace Prefix: | he_
Data Type: | num:percentItemType
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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=36462937&loc=d3e19207-110258 + Details
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- Details
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