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LONG-TERM DEBT - Schedule of Subordinated Debt Securities (Details) - Subordinated Debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
HomeStreet Statutory Trust Subordinated Debt Securities I
Debt Instrument [Line Items]
Amount	$ 5,155	$ 5,155
HomeStreet Statutory Trust Subordinated Debt Securities II
Debt Instrument [Line Items]
Amount	20,619	20,619
HomeStreet Statutory Trust Subordinated Debt Securities III
Debt Instrument [Line Items]
Amount	20,619	20,619
HomeStreet Statutory Trust Subordinated Debt Securities IV
Debt Instrument [Line Items]
Amount	$ 15,464	$ 15,464
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities I
Debt Instrument [Line Items]
Interest rate	1.70%	1.70%
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities II
Debt Instrument [Line Items]
Interest rate	1.50%	1.50%
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities III
Debt Instrument [Line Items]
Interest rate	1.37%	1.37%
3-Month LIBOR | HomeStreet Statutory Trust Subordinated Debt Securities IV
Debt Instrument [Line Items]
Interest rate	1.68%	1.68%

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