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Bank segment (HEI only) Balance Sheets Data (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Assets |  |  |  |
Cash and cash equivalents | $ 175,542 us-gaap_CashCashEquivalentsAndFederalFundsSold | $ 220,036 us-gaap_CashCashEquivalentsAndFederalFundsSold | $ 219,662 us-gaap_CashCashEquivalentsAndFederalFundsSold | $ 270,265 us-gaap_CashCashEquivalentsAndFederalFundsSold
Available-for-sale investment securities, at fair value | 550,394 us-gaap_AvailableForSaleSecurities | 529,007 us-gaap_AvailableForSaleSecurities |  |
Stock in Federal Home Loan Bank of Seattle, at cost | 69,302 us-gaap_FederalHomeLoanBankStock | 92,546 us-gaap_FederalHomeLoanBankStock |  |
Allowance for loan losses | (45,618)us-gaap_LoansAndLeasesReceivableAllowance | (40,116)us-gaap_LoansAndLeasesReceivableAllowance |  |
Total loans, net | 4,389,033 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 4,110,113 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
Loans held for sale, at lower of cost or fair value | 8,424 us-gaap_LoansReceivableHeldForSaleNet | 5,302 us-gaap_LoansReceivableHeldForSaleNet |  |
Total other assets | 541,542 us-gaap_OtherAssets | 512,627 us-gaap_OtherAssets |  |
Goodwill | 82,190 us-gaap_Goodwill | 82,190 us-gaap_Goodwill |  |
Total assets | 11,184,161 us-gaap_Assets | 10,340,044 us-gaap_Assets |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |
Other | 531,230 us-gaap_OtherLiabilities | 524,224 us-gaap_OtherLiabilities |  |
Total liabilities | 9,358,440 us-gaap_Liabilities | 8,578,681 us-gaap_Liabilities |  |
Commitments and contingencies (see “Litigation” below) |  |  |  |
Retained earnings | 297,509 us-gaap_RetainedEarningsAccumulatedDeficit | 255,694 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Net unrealized gains (losses) on securities | 462 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (3,663)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |
Accumulated other comprehensive income (loss), net of taxes | (27,378)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (16,750)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (26,423)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (19,137)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders' equity | 1,791,428 us-gaap_StockholdersEquity | 1,727,070 us-gaap_StockholdersEquity | 1,593,865 us-gaap_StockholdersEquity | 1,528,706 us-gaap_StockholdersEquity
Total liabilities and shareholders' equity | 11,184,161 us-gaap_LiabilitiesAndStockholdersEquity | 10,340,044 us-gaap_LiabilitiesAndStockholdersEquity |  |
Other assets |  |  |  |
Total property, plant and equipment, net | 4,148,774 us-gaap_PropertyPlantAndEquipmentNet | 3,865,514 us-gaap_PropertyPlantAndEquipmentNet |  |
Total other assets | 541,542 us-gaap_OtherAssets | 512,627 us-gaap_OtherAssets |  |
Other liabilities |  |  |  |
Total other liabilities | 531,230 us-gaap_OtherLiabilities | 524,224 us-gaap_OtherLiabilities |  |
American Savings Bank (ASB) |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 107,233 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 108,998 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Interest-bearing deposits | 54,230 us-gaap_InterestBearingDepositsInBanks / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 47,605 us-gaap_InterestBearingDepositsInBanks / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Available-for-sale investment securities, at fair value | 550,394 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 529,007 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Stock in Federal Home Loan Bank of Seattle, at cost | 69,302 us-gaap_FederalHomeLoanBankStock / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 92,546 us-gaap_FederalHomeLoanBankStock / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Loans receivable held for investment | 4,434,651 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 4,150,229 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Allowance for loan losses | (45,618)us-gaap_LoansAndLeasesReceivableAllowance / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (40,116)us-gaap_LoansAndLeasesReceivableAllowance / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total loans, net | 4,389,033 us-gaap_LoansAndLeasesReceivableNetReportedAmount / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 4,110,113 us-gaap_LoansAndLeasesReceivableNetReportedAmount / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Loans held for sale, at lower of cost or fair value | 8,424 us-gaap_LoansReceivableHeldForSaleNet / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 5,302 us-gaap_LoansReceivableHeldForSaleNet / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total other assets | 304,435 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 268,063 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Goodwill | 82,190 us-gaap_Goodwill / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 82,190 us-gaap_Goodwill / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total assets | 5,565,241 us-gaap_Assets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 5,243,824 us-gaap_Assets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |  |
Deposit liabilities-noninterest-bearing | 1,342,794 us-gaap_NoninterestBearingDepositLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,214,418 us-gaap_NoninterestBearingDepositLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Deposit liabilities-interest-bearing | 3,280,621 us-gaap_InterestBearingDepositLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 3,158,059 us-gaap_InterestBearingDepositLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Other borrowings | 290,656 us-gaap_OtherBorrowings / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 244,514 us-gaap_OtherBorrowings / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Other | 116,527 us-gaap_OtherLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 105,679 us-gaap_OtherLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total liabilities | 5,030,598 us-gaap_Liabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 4,722,670 us-gaap_Liabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Common stock | 1 us-gaap_CommonStockValue / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1 us-gaap_CommonStockValue / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Additional paid in capital | 338,411 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 336,053 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Retained earnings | 212,789 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 197,297 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Net unrealized gains (losses) on securities | 462 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (3,663)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Retirement benefit plans | (17,020)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (8,534)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Accumulated other comprehensive income (loss), net of taxes | (16,558)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (12,197)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total shareholders' equity | 534,643 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 521,154 us-gaap_StockholdersEquity / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total liabilities and shareholders' equity | 5,565,241 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 5,243,824 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Other assets |  |  |  |
Bank-owned life insurance | 134,115 us-gaap_BankOwnedLifeInsurance / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 129,963 us-gaap_BankOwnedLifeInsurance / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total property, plant and equipment, net | 92,407 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 67,766 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Prepaid expenses | 3,196 us-gaap_PrepaidExpenseCurrentAndNoncurrent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 3,616 us-gaap_PrepaidExpenseCurrentAndNoncurrent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Accrued interest receivable | 13,632 us-gaap_InterestReceivable / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 13,133 us-gaap_InterestReceivable / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Mortgage-servicing rights | 11,540 us-gaap_ServicingAssetAtAmortizedValue / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 11,687 us-gaap_ServicingAssetAtAmortizedValue / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Low-income housing equity investments | 32,457 he_AffordableHousingProgramEquityInvestment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 14,543 he_AffordableHousingProgramEquityInvestment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Real estate acquired in settlement of loans, net | 891 us-gaap_RealEstateAcquiredThroughForeclosure / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,205 us-gaap_RealEstateAcquiredThroughForeclosure / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Other | 16,197 us-gaap_OtherAssetsMiscellaneous / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 26,150 us-gaap_OtherAssetsMiscellaneous / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total other assets | 304,435 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 268,063 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Other liabilities |  |  |  |
Accrued expenses | 37,880 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 19,989 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Federal and state income taxes payable | 26,806 us-gaap_AccruedIncomeTaxes / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 37,807 us-gaap_AccruedIncomeTaxes / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Cashier's checks | 20,509 he_CashierChecks / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 21,110 he_CashierChecks / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Advance payments by borrowers | 9,652 us-gaap_AdvancePaymentsByBorrowersForTaxesAndInsurance / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 9,647 us-gaap_AdvancePaymentsByBorrowersForTaxesAndInsurance / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Other | 21,680 us-gaap_OtherSundryLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 17,126 us-gaap_OtherSundryLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |
Total other liabilities | $ 116,527 us-gaap_OtherLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 105,679 us-gaap_OtherLiabilities / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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