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FAIR VALUE MEASUREMENTS - Effect of Percentage Change In Measurement Inputs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 10,133,041 $ 10,321,671
MSRs And MSR Financing Receivables | Agency Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 6,195,239  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value 6,753,957  
Change in Estimated Fair Value:    
Amount $ 558,718  
Percentage 9.00%  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,524,015  
Change in Estimated Fair Value:    
Amount $ 328,776  
Percentage 5.30%  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,210,045  
Change in Estimated Fair Value:    
Amount $ 14,806  
Percentage 0.20%  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,136,736  
Change in Estimated Fair Value:    
Amount $ (58,503)  
Percentage (0.90%)  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,462,871  
Change in Estimated Fair Value:    
Amount $ 267,632  
Percentage 4.30%  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,353,259  
Change in Estimated Fair Value:    
Amount $ 158,020  
Percentage 2.60%  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,202,880  
Change in Estimated Fair Value:    
Amount $ 7,641  
Percentage 0.10%  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,165,988  
Change in Estimated Fair Value:    
Amount $ (29,251)  
Percentage (0.50%)  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,948,572  
Change in Estimated Fair Value:    
Amount $ (246,667)  
Percentage (4.00%)  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,048,386  
Change in Estimated Fair Value:    
Amount $ (146,853)  
Percentage (2.40%)  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,187,232  
Change in Estimated Fair Value:    
Amount $ (8,007)  
Percentage (0.10%)  
MSRs And MSR Financing Receivables | Agency Securities | Ten Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,224,492  
Change in Estimated Fair Value:    
Amount $ 29,253  
Percentage 0.50%  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,720,688  
Change in Estimated Fair Value:    
Amount $ (474,551)  
Percentage (7.70%)  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,913,429  
Change in Estimated Fair Value:    
Amount $ (281,810)  
Percentage (4.50%)  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,178,949  
Change in Estimated Fair Value:    
Amount $ (16,290)  
Percentage (0.30%)  
MSRs And MSR Financing Receivables | Agency Securities | Twenty Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,253,744  
Change in Estimated Fair Value:    
Amount $ 58,505  
Percentage 0.90%  
MSRs And MSR Financing Receivables | Non-Agency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 830,163  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value 915,642  
Change in Estimated Fair Value:    
Amount $ 85,479  
Percentage 10.30%  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 877,529  
Change in Estimated Fair Value:    
Amount $ 47,366  
Percentage 5.70%  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 834,109  
Change in Estimated Fair Value:    
Amount $ 3,946  
Percentage 0.50%  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 829,688  
Change in Estimated Fair Value:    
Amount $ (475)  
Percentage (0.10%)  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 870,970  
Change in Estimated Fair Value:    
Amount $ 40,807  
Percentage 4.90%  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 853,206  
Change in Estimated Fair Value:    
Amount $ 23,043  
Percentage 2.80%  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 832,054  
Change in Estimated Fair Value:    
Amount $ 1,891  
Percentage 0.20%  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 829,925  
Change in Estimated Fair Value:    
Amount $ (238)  
Percentage 0.00%  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 792,778  
Change in Estimated Fair Value:    
Amount $ (37,385)  
Percentage (4.50%)  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 808,299  
Change in Estimated Fair Value:    
Amount $ (21,864)  
Percentage (2.60%)  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 828,242  
Change in Estimated Fair Value:    
Amount $ (1,921)  
Percentage (0.20%)  
MSRs And MSR Financing Receivables | Non-Agency | Ten Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 830,400  
Change in Estimated Fair Value:    
Amount $ 237  
Percentage 0.00%  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 758,434  
Change in Estimated Fair Value:    
Amount $ (71,729)  
Percentage (8.60%)  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 787,527  
Change in Estimated Fair Value:    
Amount $ (42,636)  
Percentage (5.10%)  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 825,429  
Change in Estimated Fair Value:    
Amount $ (4,734)  
Percentage (0.60%)  
MSRs And MSR Financing Receivables | Non-Agency | Twenty Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 830,637  
Change in Estimated Fair Value:    
Amount $ 474  
Percentage 0.10%  
MSRs And MSR Financing Receivables | Ginnie Mae    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 3,107,639  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value 3,381,235  
Change in Estimated Fair Value:    
Amount $ 273,596  
Percentage 8.80%  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,269,945  
Change in Estimated Fair Value:    
Amount $ 162,306  
Percentage 5.20%  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,146,616  
Change in Estimated Fair Value:    
Amount $ 38,977  
Percentage 1.30%  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,046,484  
Change in Estimated Fair Value:    
Amount $ (61,155)  
Percentage (2.00%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,238,835  
Change in Estimated Fair Value:    
Amount $ 131,196  
Percentage 4.20%  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,184,586  
Change in Estimated Fair Value:    
Amount $ 76,947  
Percentage 2.50%  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,127,129  
Change in Estimated Fair Value:    
Amount $ 19,490  
Percentage 0.60%  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,077,061  
Change in Estimated Fair Value:    
Amount $ (30,578)  
Percentage (1.00%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,986,478  
Change in Estimated Fair Value:    
Amount $ (121,161)  
Percentage (3.90%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,037,730  
Change in Estimated Fair Value:    
Amount $ (69,909)  
Percentage (2.20%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,088,175  
Change in Estimated Fair Value:    
Amount $ (19,464)  
Percentage (0.60%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Ten Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,138,216  
Change in Estimated Fair Value:    
Amount $ 30,577  
Percentage 1.00%  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,874,331  
Change in Estimated Fair Value:    
Amount $ (233,308)  
Percentage (7.50%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,973,854  
Change in Estimated Fair Value:    
Amount $ (133,785)  
Percentage (4.30%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,068,857  
Change in Estimated Fair Value:    
Amount $ (38,782)  
Percentage (1.20%)  
MSRs And MSR Financing Receivables | Ginnie Mae | Twenty Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 3,168,794  
Change in Estimated Fair Value:    
Amount $ 61,155  
Percentage 2.00%