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GUARANTEES AND MORTGAGE REPURCHASE LIABILITY (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loans serviced for others | $ 7,249,934,000 |  | $ 7,249,934,000 |  |  | $ 7,375,383,000 |  |
Single family |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loans serviced for others | 5,349,832,000 |  | 5,349,832,000 |  |  | 5,436,899,000 |  |
Representations and warranties reserve for loan receivables |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve liability related to mortgage repurchase | 1,645,000 | $ 1,959,000 | 1,645,000 | $ 1,959,000 | $ 1,728,000 | 2,232,000 | $ 1,491,000 | $ 1,312,000
Loss sharing relationship |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve liability related to multifamily DUS program | 500,000 |  | 500,000 |  |  | 600,000 |  |
Loss sharing relationship | Multifamily |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
UPB of loans sold through DUS | 1,800,000,000 |  | 1,800,000,000 |  |  | 1,800,000,000 |  |
Losses incurred - related to DUS | 0 | $ 0 | 0 | $ 0 |  |  |  |
Credit risk |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve liability related to mortgage repurchase | $ 1,600,000 |  | $ 1,600,000 |  |  | $ 2,200,000 |  |

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