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LEASES - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Lessee, Operating Sublease, Description [Abstract] |
Remaining lease terms | 12 years
2024, sublease payments due to Company | $ 3.3
2025, sublease payments due to Company | 2.8
2026, sublease payments due to Company | 2.9
2027, sublease payments due to Company | 2.7
2028, sublease payments due to Company | $ 0.1

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- Definition Lessee, Operating Sublease, Asset, Payments, Due Year Five + References No definition available. + Details
Name: | hmst_LesseeOperatingSubleaseAssetPaymentsDueYearFive
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lessee, Operating Sublease, Asset, Payments, Due Year Four + References No definition available. + Details
Name: | hmst_LesseeOperatingSubleaseAssetPaymentsDueYearFour
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Operating Sublease, Asset, Payments, Due Year Three + References No definition available. + Details
Name: | hmst_LesseeOperatingSubleaseAssetPaymentsDueYearThree
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Operating Sublease, Asset, Payments, Due Year Two + References No definition available. + Details
Name: | hmst_LesseeOperatingSubleaseAssetPaymentsDueYearTwo
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Operating Sublease, Asset, Payments, Next Twelve Months + References No definition available. + Details
Name: | hmst_LesseeOperatingSubleaseAssetPaymentsNextTwelveMonths
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Operating And Finance Lease, Remaining Lease Terms + References No definition available. + Details
Name: | hmst_OperatingAndFinanceLeaseRemainingLeaseTerms
Namespace Prefix: | hmst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LesseeOperatingSubleaseDescriptionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration