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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) portfolioSegment | Dec. 31, 2021 USD ($)
Financing Receivable, Impaired [Line Items] |  |
Number of portfolio segments | portfolioSegment | 2 |
Loans held for investment ("LHFI") | $ 7,175,881 | $ 5,495,726
Allowance for unfunded commitments | 2,600 | 2,400
Accrued interest receivable | $ 23,900 | $ 17,800
California | Multifamily |  |
Financing Receivable, Impaired [Line Items] |  |
Percentage of loan portfolio | 37.00% | 33.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right |  |
Financing Receivable, Impaired [Line Items] |  |
Loans held for investment ("LHFI") | $ 3,800,000 | $ 2,800,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right |  |
Financing Receivable, Impaired [Line Items] |  |
Loans held for investment ("LHFI") | $ 501,000 | $ 419,000

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