XML 106 R119.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Fair value measurements Additional Information (Details) (American Savings Bank (ASB), USD $) | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Carrying or notional amount |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Notional amount of loans serviced | $ 1,400,000,000 he_PrincipalAmountOfLoansServiced / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember | $ 1,400,000,000 he_PrincipalAmountOfLoansServiced / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember
Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Servicing rights on loans | $ 14,500,000 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember | $ 15,700,000 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember

X
- Definition Represents the aggregate principal amount of loans serviced on behalf of others. + References No definition available. + Details
Name: | he_PrincipalAmountOfLoansServiced
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |