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Residential Whole Loans - Residential Whole Loans, at Carrying Value, Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV ratio (as a percent)	80.00%
Loans	$ 1,606,204
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	873,791
Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	37,946
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	182,879
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 72,675
Multi-Family Transitional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV ratio (as a percent)	64.00%	73.00%
Loans	$ 1,000,000	$ 632,300
Weighted Average Term to Maturity (Months)	15 months	18 months
Settled Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	$ 7,306,094	$ 6,273,743
Unpaid Principal Balance (“UPB”)	$ 7,884,912	$ 6,741,786
Weighted Average Coupon ( as a percent)	6.56%	5.78%
Weighted Average Term to Maturity (Months)	249 months	271 months
60+ Delinquency %	3.10%	3.10%
Settled Whole Loans | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	$ 3,570,184	$ 3,352,471
Unpaid Principal Balance (“UPB”)	$ 3,963,235	$ 3,671,468
Weighted Average Coupon ( as a percent)	5.60%	5.13%
Weighted Average Term to Maturity (Months)	346 months	351 months
LTV ratio (as a percent)	65.00%	65.00%
Weighted Average Original FICO	735	733
60+ Delinquency %	2.20%	2.60%
Settled Whole Loans | Non-QM loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 3,808,303	$ 3,520,671
Settled Whole Loans | Non-QM loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	68,171	56,825
Settled Whole Loans | Non-QM loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	23,230	32,253
Settled Whole Loans | Non-QM loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	63,531	61,719
Settled Whole Loans | Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	2,095,083	1,411,997
Unpaid Principal Balance (“UPB”)	$ 2,105,552	$ 1,431,692
Weighted Average Coupon ( as a percent)	8.89%	7.78%
Weighted Average Term to Maturity (Months)	11 months	12 months
LTV ratio (as a percent)	64.00%	66.00%
Weighted Average Original FICO	746	746
60+ Delinquency %	4.30%	5.30%
Settled Whole Loans | Transitional loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 1,989,050	$ 1,348,815
Settled Whole Loans | Transitional loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	25,717	6,463
Settled Whole Loans | Transitional loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	15,771	2,234
Settled Whole Loans | Transitional loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	75,014	74,180
Settled Whole Loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	1,515,032	1,375,297
Unpaid Principal Balance (“UPB”)	$ 1,667,902	$ 1,485,967
Weighted Average Coupon ( as a percent)	6.16%	5.74%
Weighted Average Term to Maturity (Months)	321 months	324 months
LTV ratio (as a percent)	68.00%	69.00%
Weighted Average Original FICO	737	737
60+ Delinquency %	3.80%	2.40%
Settled Whole Loans | Single-family rental loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 1,586,313	$ 1,442,095
Settled Whole Loans | Single-family rental loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	17,947	8,431
Settled Whole Loans | Single-family rental loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	28,249	7,978
Settled Whole Loans | Single-family rental loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	35,393	27,463
Settled Whole Loans | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	72,647	82,884
Unpaid Principal Balance (“UPB”)	$ 79,751	$ 90,843
Weighted Average Coupon ( as a percent)	4.38%	3.31%
Weighted Average Term to Maturity (Months)	145 months	151 months
LTV ratio (as a percent)	28.00%	30.00%
Weighted Average Original FICO	725	714
60+ Delinquency %	4.30%	5.90%
Settled Whole Loans | Seasoned performing loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 75,016	$ 84,514
Settled Whole Loans | Seasoned performing loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	1,271	993
Settled Whole Loans | Seasoned performing loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	911	937
Settled Whole Loans | Seasoned performing loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	2,553	4,399
Settled Whole Loans | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	53,148	51,094
Unpaid Principal Balance (“UPB”)	$ 68,472	$ 61,816
Weighted Average Coupon ( as a percent)	3.44%	3.44%
Weighted Average Term to Maturity (Months)	335 months	344 months
LTV ratio (as a percent)	66.00%	68.00%
Weighted Average Original FICO	757	757
60+ Delinquency %	0.30%	0.00%
Settled Whole Loans | Agency eligible investor loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 68,244	$ 61,816
Settled Whole Loans | Agency eligible investor loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	0	0
Settled Whole Loans | Agency eligible investor loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	0	0
Settled Whole Loans | Agency eligible investor loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	228	0
Settled Whole Loans | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	418,312	448,887
Unpaid Principal Balance (“UPB”)	$ 517,611	$ 554,907
Weighted Average Coupon ( as a percent)	4.79%	4.66%
Weighted Average Term to Maturity (Months)	270 months	277 months
LTV ratio (as a percent)	59.00%	63.00%
60+ Delinquency %	16.80%	18.70%
Settled Whole Loans | Purchased Credit Deteriorated Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 389,166	$ 403,042
Settled Whole Loans | Purchased Credit Deteriorated Loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	41,615	48,107
Settled Whole Loans | Purchased Credit Deteriorated Loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	14,018	16,270
Settled Whole Loans | Purchased Credit Deteriorated Loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	72,812	87,488
Settled Whole Loans | Purchased Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	699,810	796,109
Unpaid Principal Balance (“UPB”)	$ 798,902	$ 884,257
Weighted Average Coupon ( as a percent)	5.17%	5.01%
Weighted Average Term to Maturity (Months)	272 months	277 months
LTV ratio (as a percent)	63.00%	68.00%
60+ Delinquency %	31.70%	39.60%
Settled Whole Loans | Purchased Non-Performing Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 449,936	$ 444,045
Settled Whole Loans | Purchased Non-Performing Loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	95,456	89,623
Settled Whole Loans | Purchased Non-Performing Loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	28,310	40,554
Settled Whole Loans | Purchased Non-Performing Loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	225,200	310,035
Settled Whole Loans | Residential whole loans, total or weighted average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	8,424,216	7,518,739
Unpaid Principal Balance (“UPB”)	$ 9,201,425	$ 8,180,950
Weighted Average Coupon ( as a percent)	5.87%	5.64%
Weighted Average Term to Maturity (Months)	244 months	272 months
60+ Delinquency %	6.40%	8.10%
Settled Whole Loans | Certain rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
LTV ratio (as a percent)	69.00%	70.00%
Transitional loans | Certain rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Securitization of eligible investor loans	$ 423,600	$ 223,200

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