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SERVICING RIGHTS, AT FAIR VALUE - Components of Service Portfolio (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Servicing Assets at Fair Value [Line Items] |  |
Total servicing portfolio | $ 116,604,153 | $ 115,971,984
Agency |  |
Servicing Assets at Fair Value [Line Items] |  |
Total servicing portfolio | 64,795,351 | 65,092,009
Government |  |
Servicing Assets at Fair Value [Line Items] |  |
Total servicing portfolio | 40,523,662 | 39,909,978
Other |  |
Servicing Assets at Fair Value [Line Items] |  |
Total servicing portfolio | $ 11,285,140 | $ 10,969,997

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