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Bank segment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Allowance for credit losses |  |  |
Other bank borrowings | $ 680,690 |  | $ 695,120
American Savings Bank (ASB) |  |  |
Allowance for credit losses |  |  |
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required | 80.00% |  |
Minimum benchmark percentage of loan to appraisal ratio on non-owner occupied residential property | 75.00% |  |
Advances from the FHLB | $ 0 |  | 414,000
American Savings Bank (ASB) | Federal Reserve Bank Advances |  |  |
Allowance for credit losses |  |  |
Other bank borrowings | 550,000 |  | $ 0
Home equity line of credit |  |  |
Allowance for credit losses |  |  |
Conversion of debt | 7,800 | $ 4,400 |
Commercial |  |  |
Allowance for credit losses |  |  |
Conversion of debt | 1,200 | 500 |
Consumer |  |  |
Allowance for credit losses |  |  |
Conversion of debt | $ 1,100 | $ 1,000 |

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- Definition Financing Receivable, Conversion Of Debt + References No definition available. + Details
Name: | he_FinancingReceivableConversionOfDebt
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum Benchmark Percentage Of Loan To Appraisal Ratio On Non-Owner Occupied Residential Property + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required as per the policy of the reporting entity. + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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- Definition This element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents other bank borrowings as of the balance sheet date, including securities sold under agreements to repurchase and advances from the Federal Home Loan Bank. + References No definition available. + Details
Name: | he_OtherBankBorrowings
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |