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Bank segment - Comprehensive income data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Condensed Statement of Income Captions [Line Items] |  |
Net income | $ 32,339 us-gaap_ProfitLoss | $ 46,260 us-gaap_ProfitLoss
Net unrealized gains (losses) on securities: |  |
Net unrealized gains losses on available-for-sale investment securities arising during the period, net of tax benefits of $2,278 and $1,664 for the respective periods | 3,451 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 2,520 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil and $1,132 for the respective periods | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | (1,715)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Retirement benefit plans: |  |
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $259 and $144 for the respective periods | 5,459 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax | 2,813 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
Other comprehensive income, net of taxes | 4,058 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 1,167 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income | 35,924 us-gaap_ComprehensiveIncomeNetOfTax | 46,954 us-gaap_ComprehensiveIncomeNetOfTax
Net unrealized gains (losses) on securities arising during the period, taxes | (2,278)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | (1,664)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Less: reclassification adjustment for net realized gains included in net income, taxes | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (1,132)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | (3,486)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax | (1,796)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax
American Savings Bank (ASB) |  |
Condensed Statement of Income Captions [Line Items] |  |
Net income | 13,475 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 14,399 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net unrealized gains (losses) on securities: |  |
Net unrealized gains losses on available-for-sale investment securities arising during the period, net of tax benefits of $2,278 and $1,664 for the respective periods | 3,451 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 2,520 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil and $1,132 for the respective periods | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (1,715)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Retirement benefit plans: |  |
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $259 and $144 for the respective periods | 392 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 219 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Other comprehensive income, net of taxes | 3,843 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,024 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Comprehensive income | 17,318 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 15,423 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net unrealized gains (losses) on securities arising during the period, taxes | 2,278 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: reclassification adjustment for net realized gains included in net income, taxes | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,132 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | $ 259 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ (144)he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndReclassificationOfDefinedBenefitPlanNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember

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