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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($) segment	Dec. 31, 2024 USD ($)
Financing Receivable, Impaired [Line Items]
Number of portfolio segments | segment	2
Loans held for investment ("LHFI")	$ 5,887,333	$ 6,193,053
Allowance for unfunded commitments	1,100	1,100
Accrued interest receivable	$ 23,500	$ 25,100
Washington | Single family
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	13.00%	13.00%
California | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	30.00%	30.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 3,200,000	$ 4,000,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 1,900,000	$ 1,400,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3A

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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