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LONG-TERM DEBT - Schedule of Subordinated Debt Securities (Details) - Subordinated Debt $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
HomeStreet Statutory Trust Subordinated Debt Securities I
Debt Instrument [Line Items]
Amount	$ 5,155
Call option	5 years
HomeStreet Statutory Trust Subordinated Debt Securities II
Debt Instrument [Line Items]
Amount	$ 20,619
Call option	5 years
HomeStreet Statutory Trust Subordinated Debt Securities III
Debt Instrument [Line Items]
Amount	$ 20,619
Call option	5 years
HomeStreet Statutory Trust Subordinated Debt Securities IV
Debt Instrument [Line Items]
Amount	$ 15,464
Call option	5 years
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities I
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities II
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities III
Debt Instrument [Line Items]
Basis spread on variable rate	1.37%
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities IV
Debt Instrument [Line Items]
Basis spread on variable rate	1.68%

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