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LOANS AND CREDIT QUALITY - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Allowance for unfunded commitments	$ 1,100	$ 1,800
Accrued interest receivable	25,100	28,900
Loans held for investment ("LHFI")	$ 6,193,053	$ 7,382,404
Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position, Extensible List Not Disclosed Flag	Accrued interest on LHFI
Washington | Residential Mortgage and Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	13.00%	11.00%
California | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	30.00%	36.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 4,000,000	$ 5,100,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 1,400,000	$ 1,200,000

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- Definition

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- Definition

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Amount, after allowance for credit loss, of accrued interest on financing receivable.

+ 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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