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Fair value measurements Quantitative Information About Level 3 Fair Value Measurements (Details) (Level 3, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Residential loan | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | $ 2,297 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | $ 2,361 us-gaap_AssetsFairValueDisclosure / 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) | 83.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 87.00%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 | 44.00%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 | 96.00%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 | 170 us-gaap_AssetsFairValueDisclosure / 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 | 50.00%he_FairValueAssumptionsAppraisedValueWeightedAverageRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Home equity line of credit | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) |  | 45.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Home equity line of credit | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) |  | 50.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Commercial loan 1 | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 145 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan1Member / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 217 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan1Member / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Fair value of business assets (as a percent) | 91.00%he_FairValueInputsFairValueOfBusinessAssetsRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan1Member / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember | 19.00%he_FairValueInputsFairValueOfBusinessAssetsRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan1Member / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember
Tax credit investments |  |
Fair value measurements |  |
Fair value | 8,975 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_TaxCreditInvestmentsMember |
Tax credit investments | Fair value of property or collateral | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) | 5.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_TaxCreditInvestmentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember |
Tax credit investments | Fair value of property or collateral | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) | 93.00%he_FairValueInputsAppraisedValueRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_TaxCreditInvestmentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = he_FairValueOfPropertyOrCollateralMember |
Tax credit investments | Discounted cash flow |  |
Fair value measurements |  |
Fair value of business assets (as a percent) | 88.00%he_FairValueInputsFairValueOfBusinessAssetsRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_TaxCreditInvestmentsMember / us-gaap_ValuationTechniqueAxis = he_DiscountedCashFlowMember |
Weighted average discount rate | 7.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_TaxCreditInvestmentsMember / us-gaap_ValuationTechniqueAxis = he_DiscountedCashFlowMember |
Loans |  |
Fair value measurements |  |
Fair value | 2,445 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_LoansMember | 4,416 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_LoansMember
Real estate acquired in settlement of loans | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | 288 us-gaap_AssetsFairValueDisclosure / 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 |
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 |
Commercial loan 2 | Discounted cash flow |  |
Fair value measurements |  |
Fair value |  | $ 1,668 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan2Member / us-gaap_ValuationTechniqueAxis = he_DiscountedCashFlowMember
Present value of expected future cash flows (as a percent) |  | 58.00%he_FairValueInputsPaydownOfLoansRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan2Member / us-gaap_ValuationTechniqueAxis = he_DiscountedCashFlowMember
Weighted average discount rate |  | 4.50%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_CommercialLoan2Member / us-gaap_ValuationTechniqueAxis = he_DiscountedCashFlowMember

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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 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 Represents the anticipated debt restructuring for pay down of loan used as an input to measure fair value, expressed as a percentage. + References No definition available. + Details
Name: | he_FairValueInputsPaydownOfLoansRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration