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Fair value measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Discounted cash flow |
Fair value measurements |
Discount rate (as a percent) | 8.50%
Fair Value, Inputs, Level 3 | Residential loan | Fair value of property or collateral |
Fair value measurements |
Fair value | $ 2,361
Fair Value Assumptions, Appraised Value, Weighted Average Rate | 87.00%
Fair Value, Inputs, Level 3 | Residential loan | Fair value of property or collateral | Minimum |
Fair value measurements |
Appraised value (as a percent) | 44.00%
Fair Value, Inputs, Level 3 | Residential loan | Fair value of property or collateral | Maximum |
Fair value measurements |
Appraised value (as a percent) | 96.00%
Fair Value, Inputs, Level 3 | Home equity line of credit | Fair value of property or collateral |
Fair value measurements |
Fair value | 170
Fair Value Assumptions, Appraised Value, Weighted Average Rate | 50.00%
Fair Value, Inputs, Level 3 | Home equity line of credit | Fair value of property or collateral | Minimum |
Fair value measurements |
Appraised value (as a percent) | 45.00%
Fair Value, Inputs, Level 3 | Home equity line of credit | Fair value of property or collateral | Maximum |
Fair value measurements |
Appraised value (as a percent) | 50.00%
Fair Value, Inputs, Level 3 | Commercial loans |
Fair value measurements |
Fair value | 4,416
Fair Value, Inputs, Level 3 | Commercial loan 1 | Fair value of property or collateral |
Fair value measurements |
Fair value | 217
Fair value of business assets (as a percent) | 19.00%
Fair Value, Inputs, Level 3 | Commercial loan 2 | Fair value of property or collateral |
Fair value measurements |
Fair value | $ 1,668
Fair Value, Inputs, Level 3 | Commercial loan 2 | Discounted cash flow |
Fair value measurements |
Present value of expected future cash flows based on anticipated debt restructuring (as a percent) | 58.00%
Discount rate (as a percent) | 4.50%

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- Definition Fair Value Assumptions, Appraised Value, Weighted Average Rate + References No definition available. + Details
Name: | he_FairValueAssumptionsAppraisedValueWeightedAverageRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the appraised value used as an input to measure fair value, expressed as a percentage. + References No definition available. + Details
Name: | he_FairValueInputsAppraisedValueRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the fair value of business assets used as an input to measure fair value, expressed as a percentage. + References No definition available. + Details
Name: | he_FairValueInputsFairValueOfBusinessAssetsRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the anticipated debt restructuring for pay down of loan used as an input to measure fair value, expressed as a percentage. + References No definition available. + Details
Name: | he_FairValueInputsPaydownOfLoansRate
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration