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FAIR VALUE MEASUREMENTS - Schedule of Estimated Change in Fair Value of Interests in the Agency MSRs, Non-Agency MSRs and Ginnie Mae MSRs (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 9,300,989 $ 8,405,938
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 5,767,835  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value 6,265,455  
Amount $ 497,620  
Percentage 8.60%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,091,779  
Amount $ 323,944  
Percentage 5.60%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,814,988  
Amount $ 47,153  
Percentage 0.80%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,696,242  
Amount $ (71,593)  
Percentage (1.20%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 6,006,434  
Amount $ 238,599  
Percentage 4.10%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,907,778  
Amount $ 139,943  
Percentage 2.40%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,776,130  
Amount $ 8,295  
Percentage 0.10%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,732,039  
Amount $ (35,796)  
Percentage (0.60%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,547,521  
Amount $ (220,314)  
Percentage (3.80%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,638,897  
Amount $ (128,938)  
Percentage (2.20%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,759,303  
Amount $ (8,532)  
Percentage (0.10%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Ten Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,803,631  
Amount $ 35,796  
Percentage 0.60%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,343,621  
Amount $ (424,214)  
Percentage (7.40%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,521,963  
Amount $ (245,872)  
Percentage (4.30%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,750,635  
Amount $ (17,200)  
Percentage (0.30%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Agency | Twenty Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 5,839,427  
Amount $ 71,592  
Percentage 1.20%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 818,978  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value 897,886  
Amount $ 78,908  
Percentage 9.60%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 868,833  
Amount $ 49,855  
Percentage 6.10%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 821,809  
Amount $ 2,831  
Percentage 0.30%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 817,035  
Amount $ (1,943)  
Percentage (0.20%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 856,713  
Amount $ 37,735  
Percentage 4.60%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 843,064  
Amount $ 24,086  
Percentage 2.90%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 820,025  
Amount $ 1,047  
Percentage 0.10%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 818,007  
Amount $ (971)  
Percentage (0.10%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 784,295  
Amount $ (34,683)  
Percentage (4.20%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 796,317  
Amount $ (22,661)  
Percentage (2.80%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 818,054  
Amount $ (924)  
Percentage (0.10%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Ten Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 819,950  
Amount $ 972  
Percentage 0.10%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 752,331  
Amount $ (66,647)  
Percentage (8.10%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 775,039  
Amount $ (43,939)  
Percentage (5.40%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 816,107  
Amount $ (2,871)  
Percentage (0.40%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Non-Agency | Twenty Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 820,921  
Amount $ 1,943  
Percentage 0.20%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 2,714,176  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value 2,942,070  
Amount $ 227,894  
Percentage 8.40%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,860,583  
Amount $ 146,407  
Percentage 5.40%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,752,014  
Amount $ 37,838  
Percentage 1.40%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,652,488  
Amount $ (61,688)  
Percentage (2.30%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Decrease In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,823,133  
Amount $ 108,957  
Percentage 4.00%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Decrease In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,782,842  
Amount $ 68,666  
Percentage 2.50%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Decrease In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,732,677  
Amount $ 18,501  
Percentage 0.70%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Decrease In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,682,966  
Amount $ (31,210)  
Percentage (1.10%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,612,046  
Amount $ (102,130)  
Percentage (3.80%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,650,936  
Amount $ (63,240)  
Percentage (2.30%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,694,399  
Amount $ (19,777)  
Percentage (0.70%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Ten Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,743,924  
Amount $ 29,748  
Percentage 1.10%  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Increase In Measurement Input | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,518,097  
Amount $ (196,079)  
Percentage (7.20%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Increase In Measurement Input | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,594,258  
Amount $ (119,918)  
Percentage (4.40%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Increase In Measurement Input | Delinquency    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,675,564  
Amount $ (38,612)  
Percentage (1.40%)  
MSRs, MSR Financing Receivables, Excess Spread Financing: | Ginnie Mae | Twenty Percent Increase In Measurement Input | Recapture Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 2,774,402  
Amount $ 60,226  
Percentage 2.20%