XML 75 R58.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Bank segment - Troubled debt restructuring - narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Troubled debt restructurings real estate loans |  |
Troubled debt restructurings |  |
Financing receivable modifications minimum, period of payment default of loans determined to be TDRs (in days) | 90 days |
Commitments to lend additional funds to borrows with impaired or modified loans | $ 10,000 | $ 0
Consumer mortgage loans collateralized by residential real estate property in foreclosure process | $ 5,000,000 | $ 4,300,000
Land loans |  |
Troubled debt restructurings |  |
Period of interest-only monthly payment term loan (in years) | 3 years |
Land loans | Maximum |  |
Troubled debt restructurings |  |
Extension of maturity date (in years) | 5 years |

X
- Definition Financial Receivables, Loans Collateralized by Real Estate in Foreclosure + References No definition available. + Details
Name: | he_FinancialReceivablesLoansCollateralizedbyRealEstateinForeclosure
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the extension of maturity period of troubled debt under the troubled debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsIncreaseInMaturityPeriod
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum period of payment default of loans determined to be troubled debt restructurings. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsMinimumPeriodOfPaymentDefaultOfLoansDeterminedToBeTroubledDebtRestructurings
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of interest-only monthly payment term loan under the troubled debt restructuring plan. + References No definition available. + Details
Name: | he_FinancingReceivableModificationsPeriodOfInterestOnlyMonthlyPaymentTermLoan
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of restructured debt contingently payable based on the occurrence of future events or circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15765-112638 + Details
Name: | us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | he_FinancingReceivableTroubledDebtRestructuringsAndTroubledDebtRestructuringsThatSubsequentlyDefaultedAxis=he_FinancingReceivableTroubledDebtRestructuringsRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=he_ResidentialLandPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |