Affordable Housing Program Equity Investment

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible, accrued unbilled revenues and other accounts receivable.

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Represents the utility revenue taxes included in operating revenues and in taxes, other than income taxes expense.

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Period of repayment required for loans to be removed from nonaccrual status.

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Represents the period over which contributions are amortized on a straight-line basis and offset against depreciation expense.

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Amount of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Dividends declared in the period and the contractual amount of dividends (or interest on participating income bonds) that must be paid per security.

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The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security.

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Dividends declared in the period and the contractual amount of dividends (or interest on participating income bonds) that must be paid per security, taking into account all dilutive potential common shares outstanding during the period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction.

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Summary of significant accounting policies (Details 3) (USD $) Share data in Thousands, except Per Share data, 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
Basic
Distributed earnings (in dollars per share)									$ 1.24	$ 1.24	$ 1.24
Undistributed earnings (loss) (in dollars per share)									$ 0.41	$ 0.39	$ 0.19
Earnings Per Share, basic (in dollars per share)	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic	$ 1.43us-gaap_EarningsPerShareBasic
Diluted
Distributed earnings (in dollars per share)									$ 1.24	$ 1.24	$ 1.24
Undistributed earnings (losses) (in dollars per share)									$ 0.40	$ 0.38	$ 0.18
Earnings Per Share, diluted (in dollars per share)	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 1.64us-gaap_EarningsPerShareDiluted	$ 1.62us-gaap_EarningsPerShareDiluted	$ 1.42us-gaap_EarningsPerShareDiluted
Summary of significant accounting policies
Amount reclassified form other assets to plant and equipment	$ 6,399,724,000us-gaap_PropertyPlantAndEquipmentGross				$ 6,057,936,000us-gaap_PropertyPlantAndEquipmentGross				$ 6,399,724,000us-gaap_PropertyPlantAndEquipmentGross	$ 6,057,936,000us-gaap_PropertyPlantAndEquipmentGross
Other assets	541,542,000us-gaap_OtherAssets				512,627,000us-gaap_OtherAssets				541,542,000us-gaap_OtherAssets	512,627,000us-gaap_OtherAssets
Accounts Receivable
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable	2,000,000				2,000,000				2,000,000	2,000,000
Goodwill and other intangibles
Goodwill	82,190,000us-gaap_Goodwill				82,190,000us-gaap_Goodwill				82,190,000us-gaap_Goodwill	82,190,000us-gaap_Goodwill
Fair value excess over carrying value (percent)	60.00%								60.00%
Hawaiian Electric Company, Inc. and Subsidiaries
Electric utility revenues
Revenue taxes included in revenues and in taxes, other than income taxes expense									267,000,000	266,000,000	280,000,000
Weighted average AFUDC rate (as a percent)									7.70%	7.60%	7.60%
Hawaiian Electric Company, Inc. and Subsidiaries \| Minimum
Contributions in aid of construction
Contributions amortized period									30 years
Hawaiian Electric Company, Inc. and Subsidiaries \| Maximum
Contributions in aid of construction
Contributions amortized period									55 years
Bank
Loans modified in a troubled debt restructuring
Number of consecutive months of repayment required for loans to be removed from nonaccrual status									6 months
Goodwill and other intangibles
Goodwill	82,190,000				82,190,000				82,190,000	82,190,000
Stock appreciation rights (SARs) \| Common stock
Antidilutive effect of stock appreciation rights (SARs)
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares)										102	102
American Savings Bank (ASB)
Summary of significant accounting policies
Other assets	304,435,000				268,063,000				304,435,000	268,063,000
Goodwill and other intangibles
Goodwill	82,190,000				82,190,000				82,190,000	82,190,000
Antidilutive effect of stock appreciation rights (SARs)
Commitments to fund affordable housing investments	14,800,000				600,000				14,800,000	600,000
Affordable housing investment, carrying value	32,457,000				14,543,000				32,457,000	14,543,000
Restatement adjustment
Summary of significant accounting policies
Amount reclassified form other assets to plant and equipment					7,000,000					7,000,000
Other assets					$ (7,000,000)					$ (7,000,000)