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v2.4.1.9

Off Balance Sheet Arrangements and Additional Information (Detail) (USD $) | 1 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Minimum |  |
Guarantees |  |
Assessment rate for financial institutions in the lowest risk category (as a percent) | 0.025%he_PrepaidAssessmentRateForFinancialInstitutionsInLowestRiskCategory / us-gaap_RangeAxis = us-gaap_MinimumMember |
Assessment rate for financial institutions in the highest risk category (as a percent) | 0.30%he_PrepaidAssessmentRateForFinancialInstitutionsInHighestRiskCategory / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum |  |
Guarantees |  |
Assessment rate for financial institutions in the lowest risk category (as a percent) | 0.09%he_PrepaidAssessmentRateForFinancialInstitutionsInLowestRiskCategory / us-gaap_RangeAxis = us-gaap_MaximumMember |
Assessment rate for financial institutions in the highest risk category (as a percent) | 0.45%he_PrepaidAssessmentRateForFinancialInstitutionsInHighestRiskCategory / us-gaap_RangeAxis = us-gaap_MaximumMember |
American Savings Bank (ASB) |  |
Guarantees |  |
FDIC insurance assessment | $ 3,000,000 he_FDICInsuranceAssessment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 2,900,000 he_FDICInsuranceAssessment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Indemnification Agreement | American Savings Bank (ASB) |  |
Guarantees |  |
Accrued indemnification litigation obligation | 1,100,000 us-gaap_LossContingencyEstimateOfPossibleLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_IndemnificationGuaranteeMember |
Home equity line of credit |  |
Guarantees |  |
Unused Commitments to Extend Credit | 1,089,633,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember | 1,011,334,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Commercial and commercial real estate |  |
Guarantees |  |
Unused Commitments to Extend Credit | 526,133,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 527,987,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Consumer loans |  |
Guarantees |  |
Unused Commitments to Extend Credit | 56,312,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 58,080,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Residential 1-4 family |  |
Guarantees |  |
Unused Commitments to Extend Credit | 20,524,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_Residential1To4FamilyPortfolioSegmentMember | 14,241,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_Residential1To4FamilyPortfolioSegmentMember
Commercial and financial standby letters of credit [Member] |  |
Guarantees |  |
Unused Commitments to Extend Credit | 20,082,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_CommercialandStandbyLettersofCreditMember | 15,747,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_CommercialandStandbyLettersofCreditMember
March 2011 Class Action Lawsuit |  |
Guarantees |  |
Tentative settlement amount | 2,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = he_March2011ClassActionLawsuitMember |
Loss contingency reserve | 2,000,000 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LitigationCaseAxis = he_March2011ClassActionLawsuitMember |
Reserve for Off-balance Sheet Activities [Member] |  |
Guarantees |  |
Unused Commitments to Extend Credit | $ 1,712,684,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForOffBalanceSheetActivitiesMember | $ 1,627,389,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForOffBalanceSheetActivitiesMember

X
- Definition The premium paid to the Federal Deposit Insurance Corporation for deposit insurance which is included in noninterest expense. + References No definition available. + Details
Name: | he_FDICInsuranceAssessment
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the rate used to determine the prepaid risk-based assessments for financial institutions in the highest risk category. + References No definition available. + Details
Name: | he_PrepaidAssessmentRateForFinancialInstitutionsInHighestRiskCategory
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the rate used to determine the prepaid risk-based assessments for financial institutions in the lowest risk category. + References No definition available. + Details
Name: | he_PrepaidAssessmentRateForFinancialInstitutionsInLowestRiskCategory
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=he_AmericanSavingsBankFSBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=he_CommercialandStandbyLettersofCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=he_Residential1To4FamilyPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=he_March2011ClassActionLawsuitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_ReserveForOffBalanceSheetActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |