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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financing Receivable, Impaired [Line Items]
Number of portfolio segments | segment			2
Loans held for investment ("LHFI")	$ 7,294,603		$ 7,294,603		$ 7,382,404
Allowance for unfunded commitments	1,300		1,300		1,800
Accrued interest receivable	28,500		28,500		$ 28,900
Significant Payment Delay
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	$ 235	240	$ 235
Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	2,990	5,570	2,990
Interest Rate Reduction and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	0	0	0
Significant Payment Delay and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	419	634	16,868	2,879
Interest Rate Reduction, Significant Payment Delay and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	70	0	1,162
Single family | Consumer loans | Significant Payment Delay
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	235	240	235
Single family | Consumer loans | Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	0	0	0
Single family | Consumer loans | Interest Rate Reduction and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	0	0	0	0
Single family | Consumer loans | Significant Payment Delay and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	419	634	638	2,879
Single family | Consumer loans | Interest Rate Reduction, Significant Payment Delay and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default	$ 0	70	0	1,162
Commercial business | Commercial business | Significant Payment Delay
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default		0	0	0
Commercial business | Commercial business | Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default		2,990	5,570	2,990
Commercial business | Commercial business | Interest Rate Reduction and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default		0	0	0
Commercial business | Commercial business | Significant Payment Delay and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default		0	0	0
Commercial business | Commercial business | Interest Rate Reduction, Significant Payment Delay and Term Extension
Financing Receivable, Impaired [Line Items]
Loan modifications with subsequent default		$ 0	$ 0	$ 0
Washington | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	12.00%		12.00%		11.00%
California | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	36.00%		36.00%		36.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 5,200,000		$ 5,200,000		$ 5,100,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right
Financing Receivable, Impaired [Line Items]
Loans held for investment ("LHFI")	$ 1,300,000		$ 1,300,000		$ 1,200,000

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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