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LOANS AND CREDIT QUALITY - Loan Modifications with Subsequent Default, by Loan Modification (Details) - Consumer Loan - Single family - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022
Significant Payment Delay |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loan modifications with subsequent default | $ 0 | $ 0
Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loan modifications with subsequent default | 0 | 0
Interest Rate Reduction and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loan modifications with subsequent default | 0 | 0
Significant Payment Delay and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loan modifications with subsequent default | 0 | 172
Interest Rate Reduction, Significant Payment Delay and Term Extension |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Loan modifications with subsequent default | $ 553 | $ 1,555

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- Definition Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default + References No definition available. + Details
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Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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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
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
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: |
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- Details
Name: | us-gaap_LoanRestructuringModificationAxis=hmst_PaymentDeferralAndExtendedMaturityMember
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: |