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LOANS AND CREDIT QUALITY - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Number of portfolio segments | segment |  |  | 2 |  |
Loans held for investment ("LHFI") | $ 7,294,603 |  | $ 7,294,603 |  | $ 7,382,404
Allowance for unfunded commitments | 1,300 |  | 1,300 |  | 1,800
Accrued interest receivable | 28,500 |  | 28,500 |  | $ 28,900
Significant Payment Delay |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | $ 235 | 240 | $ 235 |
Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | 2,990 | 5,570 | 2,990 |
Interest Rate Reduction and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | 0 | 0 | 0 |
Significant Payment Delay and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 419 | 634 | 16,868 | 2,879 |
Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | 70 | 0 | 1,162 |
Single family | Consumer loans | Significant Payment Delay |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | 235 | 240 | 235 |
Single family | Consumer loans | Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | 0 | 0 | 0 |
Single family | Consumer loans | Interest Rate Reduction and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 0 | 0 | 0 | 0 |
Single family | Consumer loans | Significant Payment Delay and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | 419 | 634 | 638 | 2,879 |
Single family | Consumer loans | Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default | $ 0 | 70 | 0 | 1,162 |
Commercial business | Commercial business | Significant Payment Delay |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default |  | 0 | 0 | 0 |
Commercial business | Commercial business | Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default |  | 2,990 | 5,570 | 2,990 |
Commercial business | Commercial business | Interest Rate Reduction and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default |  | 0 | 0 | 0 |
Commercial business | Commercial business | Significant Payment Delay and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default |  | 0 | 0 | 0 |
Commercial business | Commercial business | Interest Rate Reduction, Significant Payment Delay and Term Extension |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loan modifications with subsequent default |  | $ 0 | $ 0 | $ 0 |
Washington | Multifamily |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Percentage of loan portfolio | 12.00% |  | 12.00% |  | 11.00%
California | Multifamily |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Percentage of loan portfolio | 36.00% |  | 36.00% |  | 36.00%
Federal Home Loan Bank Advances | Asset Pledged as Collateral without Right |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loans held for investment ("LHFI") | $ 5,200,000 |  | $ 5,200,000 |  | $ 5,100,000
Federal Reserve Bank Advances | Asset Pledged as Collateral without Right |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Loans held for investment ("LHFI") | $ 1,300,000 |  | $ 1,300,000 |  | $ 1,200,000

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