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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
Dec. 31, 2014
Dec. 31, 2013
Residential loan | Fair value of property or collateral
    
Fair value measurements    
Fair value $ 2,297us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_ValuationTechniqueAxis
= he_FairValueOfPropertyOrCollateralMember		 $ 2,361us-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 3us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_ValuationTechniqueAxis
= he_FairValueOfPropertyOrCollateralMember		 170us-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 145us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= he_CommercialLoan1Member
/ us-gaap_ValuationTechniqueAxis
= he_FairValueOfPropertyOrCollateralMember		 217us-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 8,975us-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 2,445us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_LoansMember		 4,416us-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 288us-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   $ 1,668us-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