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Bank segment (HEI only) Mortgage Servicing Rights (Details) (American Savings Bank (ASB), Mortgage Servicing Rights (MSR), USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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American Savings Bank (ASB) | Mortgage Servicing Rights (MSR) |  |  |  |
Loans receivable |  |  |  |
Gross carrying amount | $ 27,185 us-gaap_ServicingAsset / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 25,644 us-gaap_ServicingAsset / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Accumulated amortization | (15,436)he_ServicingAssetAccumulatedAmortization / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (13,706)he_ServicingAssetAccumulatedAmortization / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Valuation allowance | (209)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (251)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (498)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (175)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net carrying amount | $ 11,540 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 11,687 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 10,818 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |

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- Definition Servicing Asset, Accumulated Amortization + References No definition available. + Details
Name: | he_ServicingAssetAccumulatedAmortization
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Servicing Asset, Net + References No definition available. + Details
Name: | he_ServicingAssetNet
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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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
Name: | us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant