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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) portfolioSegment | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |
Number of portfolio segments | portfolioSegment | 2 |  |
Loans held for investment ("LHFI") | $ 7,405,052 |  | $ 7,382,404
Allowance for unfunded commitments | 1,600 |  | 1,800
Accrued interest receivable | 29,200 |  | $ 28,900
Consumer loans | Significant Payment Delay |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 241 |  |
Consumer loans | Term Extension |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 4,420 |  |
Consumer loans | Extended Maturity and Interest Rate Reduction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 0 |  |
Consumer loans | Significant Payment Delay and Term Extension |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 20,415 |  |
Consumer loans | Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 0 |  |
Single family | Consumer loans | Significant Payment Delay |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 241 | $ 0 |
Single family | Consumer loans | Term Extension |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 0 | 0 |
Single family | Consumer loans | Extended Maturity and Interest Rate Reduction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 0 | 0 |
Single family | Consumer loans | Significant Payment Delay and Term Extension |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | 351 | 2,030 |
Single family | Consumer loans | Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loan modifications with subsequent default | $ 0 | $ 623 |
California | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Percentage of loan portfolio | 36.00% |  | 36.00%
Washington | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Percentage of loan portfolio | 11.00% |  | 11.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans held for investment ("LHFI") | $ 5,100,000 |  | $ 5,100,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans held for investment ("LHFI") | $ 1,400,000 |  | $ 1,200,000

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