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LONG-TERM DEBT - Schedule of Subordinated Debt Securities (Details) - Subordinated Debt $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
HomeStreet Statutory Trust Subordinated Debt Securities I
Debt Instrument [Line Items]
Amount	$ 5,155
Call options, term exercisable without penalty	5 years
HomeStreet Statutory Trust Subordinated Debt Securities I | Three Month LIBOR
Debt Instrument [Line Items]
Interest rate	1.70%
HomeStreet Statutory Trust Subordinated Debt Securities II
Debt Instrument [Line Items]
Amount	$ 20,619
Call options, term exercisable without penalty	5 years
HomeStreet Statutory Trust Subordinated Debt Securities II | Three Month LIBOR
Debt Instrument [Line Items]
Interest rate	1.50%
HomeStreet Statutory Trust Subordinated Debt Securities III
Debt Instrument [Line Items]
Amount	$ 20,619
Call options, term exercisable without penalty	5 years
HomeStreet Statutory Trust Subordinated Debt Securities III | Three Month LIBOR
Debt Instrument [Line Items]
Interest rate	1.37%
HomeStreet Statutory Trust Subordinated Debt Securities IV.
Debt Instrument [Line Items]
Amount	$ 15,464
Call options, term exercisable without penalty	5 years
HomeStreet Statutory Trust Subordinated Debt Securities IV. | Three Month LIBOR
Debt Instrument [Line Items]
Interest rate	1.68%

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