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LEASES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Lessee, Operating Sublease, Description [Abstract]
Remaining lease terms	11 years
2025, sublease payments due to Company	$ 2,800
2026, sublease payments due to Company	2,900
2027, sublease payments due to Company	2,700
2028, sublease payments due to Company	69
2029, sublease payments due to Company	29
Lessee, Operating Sublease, Asset, Impairment	$ 2,000

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- Definition

Lessee, Operating Sublease, Asset, Impairment

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No definition available.

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Namespace Prefix:	hmst_
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Balance Type:	debit
Period Type:	duration

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- Definition

Lessee, Operating Sublease, Asset, Payments, Due Year Five

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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

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No definition available.

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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 Three

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No definition available.

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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 Two

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No definition available.

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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, Next Twelve Months

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No definition available.

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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.

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Data Type:	xbrli:durationItemType
Balance Type:	na
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No definition available.

+ Details

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