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Bank segment (HEI only) Statements of Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income | $ 33,630 us-gaap_ProfitLoss | $ 48,286 us-gaap_ProfitLoss | $ 41,894 us-gaap_ProfitLoss | $ 46,400 us-gaap_ProfitLoss | $ 39,486 us-gaap_ProfitLoss | $ 48,707 us-gaap_ProfitLoss | $ 41,061 us-gaap_ProfitLoss | $ 34,152 us-gaap_ProfitLoss | $ 170,210 us-gaap_ProfitLoss | $ 163,406 us-gaap_ProfitLoss | $ 140,548 us-gaap_ProfitLoss
Net unrealized gains (losses) on available-for sale investment securities: |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on available-for sale investment securities arising during the period, net of (taxes) benefits of $(3,856), $9,037 and ($631) for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | 5,840 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (13,686)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 956 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: reclassification adjustment for net realized gains included in net income, net of taxes of $1,132, $488 and $53 for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | (1,715)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | (738)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | (81)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Net gains (losses) arising during the period, net of (taxes) benefits of $6,164, ($10,450) and $5,240 for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | (234,166)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | 223,177 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | (99,159)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $561, $1,187 and $684 for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | 11,344 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax | 23,280 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax | 15,291 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (10,628)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 9,673 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (7,286)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | 157,692 us-gaap_ComprehensiveIncomeNetOfTax | 171,189 us-gaap_ComprehensiveIncomeNetOfTax | 131,372 us-gaap_ComprehensiveIncomeNetOfTax
American Savings Bank (ASB) |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 51,492 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 57,534 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 58,637 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Net unrealized gains (losses) on available-for sale investment securities: |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on available-for sale investment securities arising during the period, net of (taxes) benefits of $(3,856), $9,037 and ($631) for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | 5,840 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (13,686)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 956 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: reclassification adjustment for net realized gains included in net income, net of taxes of $1,132, $488 and $53 for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | (1,715)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (738)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (81)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Net gains (losses) arising during the period, net of (taxes) benefits of $6,164, ($10,450) and $5,240 for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | (9,336)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 15,826 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (7,936)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $561, $1,187 and $684 for 2014, 2013 and 2012, respectively |  |  |  |  |  |  |  |  | 850 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,797 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 1,036 he_OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossPriorServiceGainLossAndNetTransitionAssetObligationRecognizedInNetPeriodicBenefitCostNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Other comprehensive income (loss), net of taxes |  |  |  |  |  |  |  |  | (4,361)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 3,199 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | (6,025)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember
Comprehensive income attributable to Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  | $ 47,131 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 60,733 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | $ 52,612 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember

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