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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) portfolioSegment	Dec. 31, 2021 USD ($)
Financing Receivable, Impaired [Line Items]
Number of portfolio segments | portfolioSegment	2
Allowance for unfunded commitments	$ 2,600	$ 2,400
Accrued interest receivable	18,100	17,800
Total past due and nonaccrual	$ 24,415	$ 21,020
California | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	34.00%	33.00%
Federal Home Loan Bank Advances
Financing Receivable, Impaired [Line Items]
Loans pledged as collateral	$ 3,200,000	$ 2,800,000
Federal Reserve Bank Advances
Financing Receivable, Impaired [Line Items]
Loans pledged as collateral	$ 421,000	$ 419,000

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Allowance For Unfunded Commitments

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- Definition

Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Loss, Past Due And Nonaccrual

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- Definition

Financing Receivable, Interest Receivable

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Number Of Portfolio Segments

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- Definition

Percentage of total loan portfolio.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5086-111524

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