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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) loan portfolioSegment	Dec. 31, 2020 USD ($)
Financing Receivable, Impaired [Line Items]
Number of portfolio segments | portfolioSegment	2
Allowance for unfunded commitments	$ 2.4	$ 1.6
Accrued interest receivable	$ 17.8	$ 21.2
Number of days past due on re-default consumer loans	60 days
Number of days past due on re-default commercial loans	90 days
CARES Act, Section 4013 Temporary Relief
Financing Receivable, Impaired [Line Items]
Loans granted forbearance, outstanding balance	$ 28.0
Number of loans granted forbearance | loan	41
California | Residential Mortgage and Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	33.00%	19.00%
Federal Home Loan Bank Advances
Financing Receivable, Impaired [Line Items]
Loans pledged as collateral	$ 2,800.0	$ 1,400.0
Federal Reserve Bank Advances
Financing Receivable, Impaired [Line Items]
Loans pledged as collateral	$ 419.0	$ 569.0

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Trouble Debt Restructuring, Re-Default, Number Of Days Past Due, Commercial

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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.

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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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