FAIR VALUE MEASUREMENTS - Effect of Percentage Change In Measurement Inputs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 10,389,766	$ 10,321,671
MSRs And MSR Financing Receivables | Agency Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	6,265,449
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	6,814,715
Change in Estimated Fair Value:
Amount	$ 549,266
Percentage	8.80%
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	$ 6,613,354
Change in Estimated Fair Value:
Amount	$ 347,905
Percentage	5.60%
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	$ 6,287,271
Change in Estimated Fair Value:
Amount	$ 21,822
Percentage	0.30%
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	$ 6,205,953
Change in Estimated Fair Value:
Amount	$ (59,496)
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	$ 6,528,717
Change in Estimated Fair Value:
Amount	$ 263,268
Percentage	4.20%
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	$ 6,432,278
Change in Estimated Fair Value:
Amount	$ 166,829
Percentage	2.70%
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	$ 6,276,432
Change in Estimated Fair Value:
Amount	$ 10,983
Percentage	0.20%
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	$ 6,235,597
Change in Estimated Fair Value:
Amount	$ (29,852)
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	$ 6,021,949
Change in Estimated Fair Value:
Amount	$ (243,500)
Percentage	(3.90%)
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	$ 6,110,456
Change in Estimated Fair Value:
Amount	$ (154,993)
Percentage	(2.50%)
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	$ 6,253,715
Change in Estimated Fair Value:
Amount	$ (11,734)
Percentage	(0.20%)
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	$ 6,294,885
Change in Estimated Fair Value:
Amount	$ 29,436
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	$ 5,796,791
Change in Estimated Fair Value:
Amount	$ (468,658)
Percentage	(7.50%)
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	$ 5,967,773
Change in Estimated Fair Value:
Amount	$ (297,676)
Percentage	(4.80%)
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	$ 6,241,872
Change in Estimated Fair Value:
Amount	$ (23,577)
Percentage	(0.40%)
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	$ 6,324,529
Change in Estimated Fair Value:
Amount	$ 59,080
Percentage	0.90%
MSRs And MSR Financing Receivables | Non-Agency
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 784,367
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	867,742
Change in Estimated Fair Value:
Amount	$ 83,375
Percentage	10.60%
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	$ 830,841
Change in Estimated Fair Value:
Amount	$ 46,474
Percentage	5.90%
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	$ 790,844
Change in Estimated Fair Value:
Amount	$ 6,477
Percentage	0.80%
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	$ 783,862
Change in Estimated Fair Value:
Amount	$ (505)
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	$ 822,973
Change in Estimated Fair Value:
Amount	$ 38,606
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	$ 806,939
Change in Estimated Fair Value:
Amount	$ 22,572
Percentage	2.90%
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	$ 787,641
Change in Estimated Fair Value:
Amount	$ 3,274
Percentage	0.40%
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	$ 784,104
Change in Estimated Fair Value:
Amount	$ (263)
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	$ 747,979
Change in Estimated Fair Value:
Amount	$ (36,388)
Percentage	(4.60%)
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	$ 762,960
Change in Estimated Fair Value:
Amount	$ (21,407)
Percentage	(2.70%)
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	$ 780,998
Change in Estimated Fair Value:
Amount	$ (3,369)
Percentage	(0.40%)
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	$ 784,589
Change in Estimated Fair Value:
Amount	$ 222
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	$ 714,632
Change in Estimated Fair Value:
Amount	$ (69,735)
Percentage	(8.90%)
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	$ 742,684
Change in Estimated Fair Value:
Amount	$ (41,683)
Percentage	(5.30%)
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	$ 777,621
Change in Estimated Fair Value:
Amount	$ (6,746)
Percentage	(0.90%)
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	$ 784,831
Change in Estimated Fair Value:
Amount	$ 464
Percentage	0.10%
MSRs And MSR Financing Receivables | Ginnie Mae
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 3,339,950
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	3,602,907
Change in Estimated Fair Value:
Amount	$ 262,957
Percentage	7.90%
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	$ 3,513,119
Change in Estimated Fair Value:
Amount	$ 173,169
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	$ 3,392,807
Change in Estimated Fair Value:
Amount	$ 52,857
Percentage	1.60%
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	$ 3,262,878
Change in Estimated Fair Value:
Amount	$ (77,072)
Percentage	(2.30%)
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	$ 3,466,413
Change in Estimated Fair Value:
Amount	$ 126,463
Percentage	3.80%
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	$ 3,421,818
Change in Estimated Fair Value:
Amount	$ 81,868
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	$ 3,366,268
Change in Estimated Fair Value:
Amount	$ 26,318
Percentage	0.80%
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	$ 3,301,383
Change in Estimated Fair Value:
Amount	$ (38,567)
Percentage	(1.20%)
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	$ 3,222,350
Change in Estimated Fair Value:
Amount	$ (117,600)
Percentage	(3.50%)
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	$ 3,265,826
Change in Estimated Fair Value:
Amount	$ (74,124)
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	$ 3,313,720
Change in Estimated Fair Value:
Amount	$ (26,230)
Percentage	(0.80%)
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	$ 3,378,393
Change in Estimated Fair Value:
Amount	$ 38,443
Percentage	1.20%
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	$ 3,112,933
Change in Estimated Fair Value:
Amount	$ (227,017)
Percentage	(6.80%)
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	$ 3,198,380
Change in Estimated Fair Value:
Amount	$ (141,570)
Percentage	(4.20%)
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	$ 3,287,805
Change in Estimated Fair Value:
Amount	$ (52,145)
Percentage	(1.60%)
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	$ 3,416,898
Change in Estimated Fair Value:
Amount	$ 76,948
Percentage	2.30%