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Bank segment - Mortgage servicing rights (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
American Savings Bank (ASB) |  |
Servicing Asset at Amortized Cost [Line Items] |  |
Mortgage service fees | $ 900,000 us-gaap_FeesAndCommissionsMortgageBankingAndServicing / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 900,000 us-gaap_FeesAndCommissionsMortgageBankingAndServicing / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Servicing Asset at Amortized Cost | 11,540,000 us-gaap_ServicingAssetAtAmortizedValue / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
Servicing Asset at Amortized Cost | 11,965,000 us-gaap_ServicingAssetAtAmortizedValue / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
American Savings Bank (ASB) | Mortgage Servicing Rights (MSR) |  |
Servicing Asset at Amortized Cost [Line Items] |  |
Gross carrying amount | 28,090,000 us-gaap_ServicingAsset / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 26,097,000 us-gaap_ServicingAsset / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Accumulated amortization | (16,084,000)he_ServicingAssetAccumulatedAmortization / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (14,138,000)he_ServicingAssetAccumulatedAmortization / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Valuation allowance | (41,000)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (202,000)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net carrying amount | 11,965,000 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 11,757,000 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Servicing Asset at Amortized Cost | 11,749,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 11,938,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Servicing Asset at Amortized Value, Amount Capitalized | 906,000 he_ServicingAssetatAmortizedValueAmountCapitalized / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 467,000 he_ServicingAssetatAmortizedValueAmountCapitalized / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Servicing Asset at Amortized Cost, Amortization | (647,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (432,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Other-than-temporary impairment | (2,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (14,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Servicing Asset at Amortized Cost | 12,006,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 11,959,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Valuation Allowance [Roll Forward] |  |
Valuation allowance, beginning balance | 209,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 251,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Provision (recovery) | (166,000)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (35,000)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Other-than-temporary impairment | (2,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (14,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Valuation allowance, ending balance | 41,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 202,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Unpaid principal balance | 1,414,990,000 he_FairValueInputsUnpaidPrincipalBalanceAsset / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,391,030,000 he_FairValueInputsUnpaidPrincipalBalanceAsset / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Weighted average note-rate | 4.06%he_FairValueInputsStatedInterestRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 4.07%he_FairValueInputsStatedInterestRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Weighted average discount rate | 9.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 9.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Weighted average prepayment speed | 10.60%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 9.50%us-gaap_FairValueInputsPrepaymentRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Point Adverse Change in Prepayment Speed | (750,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof25BasisPointAdverseChangeinPrepaymentSpeed / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (757,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof25BasisPointAdverseChangeinPrepaymentSpeed / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Point Adverse Change in Prepayment Speed | (1,408,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof50BasisPointAdverseChangeinPrepaymentSpeed / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (1,524,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof50BasisPointAdverseChangeinPrepaymentSpeed / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Points Adverse Change in Discount Rate | (129,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof25BasisPointsAdverseChangeinDiscountRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (140,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof25BasisPointsAdverseChangeinDiscountRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Points Adverse Change in Discount Rate | $ (256,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof50BasisPointsAdverseChangeinDiscountRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ (278,000)he_SensitivityAnalysisofFairValueTransferorsInterestsinTransferredFinancialAssetsImpactof50BasisPointsAdverseChangeinDiscountRate / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Troubled debt restructurings real estate loans |  |
Servicing Asset at Amortized Cost [Line Items] |  |
Financing Receivable Modifications Minimum, Period of Payment Default of Loans Determined to be Troubled Debt Restructurings | 90 days |

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- Definition Represents the minimum period of payment default of loans determined to be troubled debt restructurings. + References No definition available. + Details
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- Definition The hypothetical financial impact of a 25 basis point adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References No definition available. + Details
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- Definition Servicing Asset, Accumulated Amortization + References No definition available. + Details
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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
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + 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
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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition New provisions recoveries or charged against this account which increase or reduce the net value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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