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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	$ 3,000,000he_FDICInsuranceAssessment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember	$ 2,900,000he_FDICInsuranceAssessment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Indemnification Agreement | American Savings Bank (ASB)
Guarantees
Accrued indemnification litigation obligation	1,100,000us-gaap_LossContingencyEstimateOfPossibleLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_IndemnificationGuaranteeMember
Home equity line of credit
Guarantees
Unused Commitments to Extend Credit	1,089,633,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember	1,011,334,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_HomeEquityMember
Commercial and commercial real estate
Guarantees
Unused Commitments to Extend Credit	526,133,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember	527,987,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Consumer loans
Guarantees
Unused Commitments to Extend Credit	56,312,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	58,080,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Residential 1-4 family
Guarantees
Unused Commitments to Extend Credit	20,524,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_Residential1To4FamilyPortfolioSegmentMember	14,241,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_Residential1To4FamilyPortfolioSegmentMember
Commercial and financial standby letters of credit [Member]
Guarantees
Unused Commitments to Extend Credit	20,082,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_CommercialandStandbyLettersofCreditMember	15,747,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_FinancialInstrumentAxis = he_CommercialandStandbyLettersofCreditMember
March 2011 Class Action Lawsuit
Guarantees
Tentative settlement amount	2,000,000us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = he_March2011ClassActionLawsuitMember
Loss contingency reserve	2,000,000us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LitigationCaseAxis = he_March2011ClassActionLawsuitMember
Reserve for Off-balance Sheet Activities [Member]
Guarantees
Unused Commitments to Extend Credit	$ 1,712,684,000us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForOffBalanceSheetActivitiesMember	$ 1,627,389,000us-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

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Data Type:	xbrli:monetaryItemType
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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

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Namespace Prefix:	he_
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Balance Type:	na
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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

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X

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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- Details

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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

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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

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-Section 50

-Paragraph 9

-Subparagraph (b)

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- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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