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LEASES - Narrative (Details) $ in Millions	12 Months Ended
	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

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No definition available.

+ Details

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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

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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

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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

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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

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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

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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