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LEASES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2020
Lessee, Operating Sublease, Description [Abstract] |  |
Remaining lease terms | 13 years |
2023, sublease payments due to Company | $ 4.9 |
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 |
Impairment loss |  | $ 2.5

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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

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- 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

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- 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

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- 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

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- 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

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

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration