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Bank subsidiary (Details 12) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 item | Sep. 30, 2012 item
Loan modifications determined to be troubled debt restructurings |  |
Number of loan modified by extending maturity date |  | 1
Troubled debt restructurings real estate loans |  |
Loan modifications determined to be troubled debt restructurings |  |
Number of contracts | 14 | 65
Pre-modification outstanding recorded investment | $ 3,100 | $ 13,106
Post-modification outstanding recorded investment | 2,850 | 12,182
Minimum period of payment default of loans determined to be TDRs |  | 90 days
Troubled debt restructurings that subsequently defaulted |  |
Loan modifications determined to be troubled debt restructurings |  |
Number of contracts |  | 1
Recorded investment | 488 | 488
Residential 1-4 family | Troubled debt restructurings real estate loans |  |
Loan modifications determined to be troubled debt restructurings |  |
Number of contracts | 4 | 26
Pre-modification outstanding recorded investment | 1,415 | 5,884
Post-modification outstanding recorded investment | 1,332 | 5,614
Residential land | Troubled debt restructurings real estate loans |  |
Loan modifications determined to be troubled debt restructurings |  |
Number of contracts | 6 | 21
Pre-modification outstanding recorded investment | 1,168 | 4,676
Post-modification outstanding recorded investment | 1,001 | 4,022
Commercial loans | Troubled debt restructurings real estate loans |  |
Loan modifications determined to be troubled debt restructurings |  |
Number of contracts | 4 | 18
Pre-modification outstanding recorded investment | 517 | 2,546
Post-modification outstanding recorded investment | 517 | 2,546
Commercial loans | Troubled debt restructurings that subsequently defaulted |  |
Loan modifications determined to be troubled debt restructurings |  |
Number of contracts |  | 1
Recorded investment | $ 488 | $ 488

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- Definition Represents the minimum period of payment default of loans determined to be troubled debt restructurings. + References No definition available. + Details
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- Definition Represents the number of loans modified by extending maturity date under the debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsNumberOfLoansModifiedByIncreaseInMaturityPeriod
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Data Type: | xbrli:integerItemType
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- Definition The number of contracts under financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the outstanding recorded investment in financial receivables after the financial receivables being modified as troubled debt restructurings. + References No definition available. + Details
Name: | he_FinancingReceivablesModificationsPostModificationRecordedInvestment
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the outstanding recorded investment in financial receivables prior to the financial receivables being modified as troubled debt restructurings. + References No definition available. + Details
Name: | he_FinancingReceivablesModificationsPreModificationRecordedInvestment
Namespace Prefix: | he_
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- Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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