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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) portfolioSegment	Dec. 31, 2022 USD ($)
Financing Receivable, Impaired [Line Items]
Number of portfolio segments | portfolioSegment	2
Loans held for investment ("LHFI")	$ 7,444,882	$ 7,384,820
Allowance for unfunded commitments	2,200	2,200
Accrued interest receivable	$ 27,600	$ 26,900
California | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio		36.00%
California | Single and Multifamily Residental
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	36.00%
Washington | Single and Multifamily Residental
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	10.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 5,700,000	$ 5,200,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 562,000	$ 497,000

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3A
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267960-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL120267845-210446

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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