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Bank segment (HEI only) Mortgage Servicing Rights and Valuation Allowance Roll Forward (Details) (American Savings Bank (ASB), USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mortgage Servicing Rights [Roll Forward] |  |  |
Ending balance | $ 11,540,000 us-gaap_ServicingAssetAtAmortizedValue | $ 11,687,000 us-gaap_ServicingAssetAtAmortizedValue |
Mortgage Servicing Rights (MSR) |  |  |
Mortgage Servicing Rights [Roll Forward] |  |  |
Beginning balance | 11,938,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 11,316,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 8,402,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Amount capitalized | 1,637,000 he_ServicingAssetatAmortizedValueAmountCapitalized / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 2,611,000 he_ServicingAssetatAmortizedValueAmountCapitalized / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 4,845,000 he_ServicingAssetatAmortizedValueAmountCapitalized / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Amortization | (1,731,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (1,802,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (1,750,000)us-gaap_ServicingAssetAtAmortizedValueAmortization1 / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Other-than-temporary impairment | (95,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (187,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (181,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Ending balance | 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 | 11,316,000 us-gaap_ServicingAssetAtAmortizedValue / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, beginning balance | 251,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 498,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 175,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Provision (recovery) | 53,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (60,000)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 504,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Other-than-temporary impairment | (95,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (187,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (181,000)us-gaap_ServicingAssetAtAmortizedCostOtherThanTemporaryImpairments / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Valuation allowance, ending 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 | 498,000 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net carrying amount | 11,540,000 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 11,687,000 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 10,818,000 he_ServicingAssetNet / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Estimated Aggregate Amortization Expenses of Mortgage Servicing Rights [Abstract] |  |  |
2015 | 1,700,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
2016 | 1,500,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
2017 | 1,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
2018 | 1,100,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
2019 | $ 1,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FinancialInstrumentAxis = us-gaap_ServicingContractsMember / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |

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- Definition Servicing Asset at Amortized Value, Amount Capitalized + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) applied to 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 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + 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 Amount of amortization 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 50 -Paragraph 4 -Subparagraph (a)(4) -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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