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Bank segment (HEI only) (Details 7) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative instrument |  |  |
Percentage of benchmark loan to appraisal ratio in excess of which mortgage insurance is required | 80.00%he_MinimumBenchmarkPercentageofLoantoAppraisalRatiowhichMortgageInsuranceisRequired |  |
Real estate loans for investors | $ 1,400,000,000 he_RealEstateLoansServicedForInvestors | $ 1,400,000,000 he_RealEstateLoansServicedForInvestors | $ 1,300,000,000 he_RealEstateLoansServicedForInvestors
Loans pledged as collateral to secure advances from the FHLB of Seattle | 1,900,000,000 us-gaap_LoansPledgedAsCollateral | 1,700,000,000 us-gaap_LoansPledgedAsCollateral |
Loans to directors, executive directors, affiliates and any related interest of such individuals | 49,600,000 he_LoanBalancesRelatedToInterestOfIndividualDirectorsExecutiveOfficersAndRelatedInterests | 45,800,000 he_LoanBalancesRelatedToInterestOfIndividualDirectorsExecutiveOfficersAndRelatedInterests |
Lines of credit closed and repaid, net of new loans and lines of credit to executive directors | 3,800,000 he_DebtInstrumentDecreaseRepaymentsNetofIncreasesforExistingManagers |  |
New loans and lines of credit to executive directors | 6,400,000 he_AmountOfNewLoansAndLinesOfCreditToExistingDirectorsAndExecutiveOfficers |  |
Lines of credit closed and repaid | 2,600,000 us-gaap_RepaymentsOfDebt |  |
Loan balances, related interests of individuals who are directors | $ 46,200,000 he_LoanBalancesRelatedToInterestOfIndividualDirectors | $ 40,500,000 he_LoanBalancesRelatedToInterestOfIndividualDirectors |

X
- Definition Represents the amount of repayment attributable to offset by new loans and lines of credit to executive directors. + References No definition available. + Details
Name: | he_AmountOfNewLoansAndLinesOfCreditToExistingDirectorsAndExecutiveOfficers
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Debt Instrument, Decrease, Repayments, Net of Increases for Existing Managers + References No definition available. + Details
Name: | he_DebtInstrumentDecreaseRepaymentsNetofIncreasesforExistingManagers
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of Loan balances, which are related to interests of individuals who are directors of bank. + References No definition available. + Details
Name: | he_LoanBalancesRelatedToInterestOfIndividualDirectors
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of Loan balances, which are related to interests of individuals who are directors of bank, executive officers and related interests. + References No definition available. + Details
Name: | he_LoanBalancesRelatedToInterestOfIndividualDirectorsExecutiveOfficersAndRelatedInterests
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required as per the policy of the reporting entity. + References No definition available. + Details
Name: | he_MinimumBenchmarkPercentageofLoantoAppraisalRatiowhichMortgageInsuranceisRequired
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real estate loans serviced for investors. + References No definition available. + Details
Name: | he_RealEstateLoansServicedForInvestors
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
Name: | us-gaap_LoansPledgedAsCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration