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Bank segment (HEI only) Securities Sold Under Agreements to Repurchase (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Securities sold under agreements to repurchase |  |  |
Callable quarterly at par until maturity in 2016 | $ 50,300,000 he_AssetsSoldunderAgreementstoRepurchaseAmountCallableQuarterlyatParUntilMaturity |  |
Overnight |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 84,758,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember |  |
Weighted-average interest rate | 0.15%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember |  |
1 to 29 days |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 0 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember |  |
Weighted-average interest rate | 0.00%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember |  |
30 to 90 days |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 0 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember |  |
Weighted-average interest rate | 0.00%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember |  |
Over 90 days |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | 105,898,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember |  |
Weighted-average interest rate | 2.50%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember |  |
Collateralized by mortgage-related securities and federal agency obligations |  |  |
Securities sold under agreements to repurchase |  |  |
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest | 230,725,000 he_AssetsSoldUnderAgreementsToRepurchaseFairValuePlusAccruedInterest / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_USGovernmentAgenciesDebtSecuritiesAndMortgageBackedSecuritiesMember |  |
Collateralized by mortgage-related securities and federal agency obligations | Overnight |  |  |
Securities sold under agreements to repurchase |  |  |
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest | 114,883,000 he_AssetsSoldUnderAgreementsToRepurchaseFairValuePlusAccruedInterest / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_USGovernmentAgenciesDebtSecuritiesAndMortgageBackedSecuritiesMember / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOvernightMember |  |
Collateralized by mortgage-related securities and federal agency obligations | 1 to 29 days |  |  |
Securities sold under agreements to repurchase |  |  |
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest | 0 he_AssetsSoldUnderAgreementsToRepurchaseFairValuePlusAccruedInterest / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_USGovernmentAgenciesDebtSecuritiesAndMortgageBackedSecuritiesMember / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityUpTo30DaysMember |  |
Collateralized by mortgage-related securities and federal agency obligations | 30 to 90 days |  |  |
Securities sold under agreements to repurchase |  |  |
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest | 0 he_AssetsSoldUnderAgreementsToRepurchaseFairValuePlusAccruedInterest / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_USGovernmentAgenciesDebtSecuritiesAndMortgageBackedSecuritiesMember / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_Maturity30To90DaysMember |  |
Collateralized by mortgage-related securities and federal agency obligations | Over 90 days |  |  |
Securities sold under agreements to repurchase |  |  |
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest | 115,842,000 he_AssetsSoldUnderAgreementsToRepurchaseFairValuePlusAccruedInterest / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_USGovernmentAgenciesDebtSecuritiesAndMortgageBackedSecuritiesMember / us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis = us-gaap_MaturityOver90DaysMember |  |
Identical securities |  |  |
Securities sold under agreements to repurchase |  |  |
Repurchase liability | $ 190,656,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | $ 145,000,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | $ 146,000,000 us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember
Weighted-average interest rate | 1.45%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 1.75%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember | 1.74%us-gaap_AssetsSoldUnderAgreementsToRepurchaseInterestRate / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = he_IdenticalSecuritiesMember

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- Definition Assets Sold under Agreements to Repurchase, Amount Callable Quarterly at Par Until Maturity + References No definition available. + Details
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- Definition Assets Sold Under Agreements To Repurchase Fair Value Plus Accrued Interest + References No definition available. + Details
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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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