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Fair value measurements (Details 4) (Fair Value, Inputs, Level 3, USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Residential loan | Fair value of property or collateral |
Fair value measurements |
Fair value | $ 13,840
Residential loan | Fair value of property or collateral | Minimum |
Fair value measurements |
Appraised value (as a percent) | 13.00%
Residential loan | Fair value of property or collateral | Maximum |
Fair value measurements |
Appraised value (as a percent) | 96.00%
Home equity line of credit | Fair value of property or collateral |
Fair value measurements |
Fair value | 536
Home equity line of credit | Fair value of property or collateral | Minimum |
Fair value measurements |
Appraised value (as a percent) | 25.00%
Home equity line of credit | Fair value of property or collateral | Maximum |
Fair value measurements |
Appraised value (as a percent) | 82.00%
Commercial loans |
Fair value measurements |
Fair value | 2,851
Commercial loan 1 | Fair value of property or collateral |
Fair value measurements |
Fair value | 220
Insurance proceeds (as a percent) | 59.00%
Commercial loan 2 | Fair value of property or collateral |
Fair value measurements |
Fair value | 892
Commercial loan 2 | Fair value of property or collateral | Minimum |
Fair value measurements |
Fair value of business assets (as a percent) | 37.00%
Commercial loan 2 | Fair value of property or collateral | Maximum |
Fair value measurements |
Fair value of business assets (as a percent) | 92.00%
Commercial loan 3 | Discounted cash flow |
Fair value measurements |
Fair value | 1,739
Present value of expected future cash flows based on anticipated debt restructuring (as a percent) | 59.00%
Discount rate (as a percent) | 4.50%
Real estate acquired in settlement of loans | Fair value of property or collateral |
Fair value measurements |
Fair value | $ 2,036
Real estate acquired in settlement of loans | Fair value of property or collateral | Minimum |
Fair value measurements |
Appraised value (as a percent) | 81.00%
Real estate acquired in settlement of loans | Fair value of property or collateral | Maximum |
Fair value measurements |
Appraised value (as a percent) | 100.00%

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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

X
- 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

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

X
- 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

X
- 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

X
- 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