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MORTGAGE BANKING OPERATIONS - Mortgage Repurchase Liability (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025
Mortgage Repurchase Losses [Roll Forward]
Balance, beginning of period		$ 3,100
Balance, end of period	$ 4,200	4,200
Representations and warranties reserve for loan receivables | Residential Real Estate | Single Family Residential
Mortgage Repurchase Losses [Roll Forward]
Balance, beginning of period	0	0
Reserve liability acquired	734	734
Additions, net of adjustments	4
Balance, end of period	$ 738	$ 738

X

- Definition

Loss Contingency Accrual, Mortgage Servicing Rights, Reserve Liability Acquired

+ References

No definition available.

+ Details

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Namespace Prefix:	hmst_
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Balance Type:	credit
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X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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X

- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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