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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) portfolioSegment | Dec. 31, 2022 USD ($)
Financing Receivable, Impaired [Line Items] |  |
Number of portfolio segments | portfolioSegment | 2 |
Allowance for unfunded commitments | $ 1,800 | $ 2,200
Accrued interest receivable | 28,900 | 26,900
Loans held for investment ("LHFI") | $ 7,382,404 | $ 7,384,820
Washington | Residential Mortgage and Multifamily |  |
Financing Receivable, Impaired [Line Items] |  |
Percentage of loan portfolio | 11.00% |
California | Multifamily |  |
Financing Receivable, Impaired [Line Items] |  |
Percentage of loan portfolio |  | 36.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right |  |
Financing Receivable, Impaired [Line Items] |  |
Loans held for investment ("LHFI") | $ 5,100,000 | $ 5,200,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right |  |
Financing Receivable, Impaired [Line Items] |  |
Loans held for investment ("LHFI") | $ 1,200,000 | $ 497,000

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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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