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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) portfolioSegment loan	Dec. 31, 2020 USD ($)
Financing Receivable, Impaired [Line Items]
Number of portfolio segments | portfolioSegment	2
Allowance for unfunded commitments	$ 2.1	$ 1.6
Accrued interest receivable	$ 19.6	$ 21.2
Number of days past due for consumer loans TDR to be re-default	60 days
Number of days past due for commercial loans TDR to be re-default	90 days
Loans granted forbearance, outstanding balance	$ 56.0
Number of loans granted forbearance | loan	133
California | Multifamily
Financing Receivable, Impaired [Line Items]
Percentage of loan portfolio	27.00%	19.00%
Federal Home Loan Bank Advances
Financing Receivable, Impaired [Line Items]
Loans pledged as collateral	$ 1,500.0	$ 1,400.0
Federal Reserve Bank Advances
Financing Receivable, Impaired [Line Items]
Loans pledged as collateral	$ 582.0	$ 569.0

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Allowance For Unfunded Commitments

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Financing Receivable, Interest Receivable

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Loans Granted Forbearance, Outstanding Balance

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Number Of Loans Granted Forbearance

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Number Of Portfolio Segments

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- Definition

Percentage of total loan portfolio.

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

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Trouble Debt Restructuring, Re-Default, Number of Days Past Due, Consumer

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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