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REGULATORY CAPITAL REQUIREMENTS - Schedule of Minimum Capital Ratios Plus Capital Conservation Buffer (Details)	Dec. 31, 2021
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Capital conservation buffer, actual	0.0466
CET-1 to risk-weighted assets	0.0700
Tier 1 capital to risk-weighted assets	0.0850
Total capital to risk-weighted assets	0.1050
HomeStreet Bank
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Capital conservation buffer, actual	0.0577

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- Definition

Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy Plus Applicable Increment Of Capital Conservation Buffer, Minimum

+ References

No definition available.

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- Definition

Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy Plus Applicable Increment Of Capital Conservation Buffer, Minimum

+ References

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- Definition

Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy Plus Applicable Increment Of Capital Conservation Buffer, Minimum

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- Definition

Capital conservation buffer percentage calculated as total risk-based capital ratio after deduction of minimum total risk-based capital ratio as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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