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Bank segment (HEI only) Changes in the Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for loan losses: |  |  |
Valuation allowance, balance at the beginning of the period | $ 40,116 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 41,985 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 37,906 us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision for loan losses | 6,126 us-gaap_ProvisionForLoanLossesExpensed | 1,507 us-gaap_ProvisionForLoanLossesExpensed | 12,883 us-gaap_ProvisionForLoanLossesExpensed
Charge-offs | 624 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries | 3,376 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries | 8,804 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries
Valuation allowance, balance at the end of the period | 45,618 us-gaap_FinancingReceivableAllowanceForCreditLosses | 40,116 us-gaap_FinancingReceivableAllowanceForCreditLosses | 41,985 us-gaap_FinancingReceivableAllowanceForCreditLosses
Ratio of net charge-offs to average loans outstanding (as a percent) | 0.01%he_FinancingReceivableAllowanceForCreditLossesRatioOfNetChargeOffsToAverageLoansOutstanding | 0.09%he_FinancingReceivableAllowanceForCreditLossesRatioOfNetChargeOffsToAverageLoansOutstanding | 0.24%he_FinancingReceivableAllowanceForCreditLossesRatioOfNetChargeOffsToAverageLoansOutstanding
Real estate loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | (1,137)he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateLoanMember | (678)he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateLoanMember | 3,828 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_RealEstateLoanMember
Other loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | $ 1,761 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_OtherLoansMember | $ 4,054 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_OtherLoansMember | $ 4,976 he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = he_OtherLoansMember

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- Definition The ratio of net charge-offs to average loans outstanding. + References No definition available. + Details
Name: | he_FinancingReceivableAllowanceForCreditLossesRatioOfNetChargeOffsToAverageLoansOutstanding
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Reduction to the allowance for credit losses related to financing receivables deemed uncollectible net of recoveries. + References No definition available. + Details
Name: | he_FinancingReceivableAllowanceForCreditLossesWriteOffsNetOfRecoveries
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of expense related to loss from loan transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=he_OtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=he_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |