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SUBSEQUENT EVENT - Narrative (Details) - Subsequent Event $ / shares in Units, $ in Millions	Jul. 29, 2021 USD ($) $ / shares
Subsequent Event [Line Items]
Dividends payable (in dollars per share) | $ / shares	$ 0.25
Share repurchase program, additional authorized amount (up to) | $	$ 15

X

- Definition

Stock Repurchase Program, Additional Authorized Amount

+ References

No definition available.

+ Details

Name:	hmst_StockRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix:	hmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: