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LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Thousands	Jan. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Outstanding balance, subordinated notes		$ 224,314	$ 126,026
Subordinated Debt
Debt Instrument [Line Items]
Outstanding balance, subordinated notes		62,000
3.5% Subordinated Notes Due 2032 | Subordinated Debt
Debt Instrument [Line Items]
Outstanding balance, subordinated notes		98,000
Stated interest rate (percent)	0.035%
Basis spread on variable rate	2.15%
Senior Notes 6.50% Due 2026 | Senior Notes
Debt Instrument [Line Items]
Outstanding balance, subordinated notes		$ 64,000	$ 64,000
Stated interest rate (percent)		6.50%	6.50%
HomeStreet Statutory Trust Subordinated Debt Securities | Subordinated Debt
Debt Instrument [Line Items]
Outstanding balance, subordinated notes			$ 62,000
HomeStreet Statutory Trust Subordinated Debt Securities I | Subordinated Debt
Debt Instrument [Line Items]
Long-term debt		$ 5,155	$ 5,155

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