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Residential Whole Loans (Residential Whole Loans, at Carrying Value - Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 3,521,624	$ 5,370,653
Purchased Credit Deteriorated Loans	673,708	698,717
Total	4,195,332
Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	2,357,185	3,707,245
Total	2,357,185
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	581,801	1,026,097
Total	581,801
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	446,374	460,742
Total	446,374
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	136,264	$ 176,569
Total	$ 136,264
90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV Ratio	86.78%	89.69%
90 or more | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	$ 144,681
90 or more | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	136,347
90 or more | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	20,233
90 or more | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	8,823
Settled Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,108,499	$ 6,066,345
Amortized Cost Basis	4,195,332	6,069,370
Unpaid Principal Balance (“UPB”)	$ 4,249,418	$ 6,141,421
Weighted Average Coupon	5.77%	5.96%
Weighted Average Term to Maturity (Months)	282 months	288 months
Settled Whole Loans | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 2,336,117	$ 3,706,857
Amortized Cost Basis	2,357,185	3,707,245
Unpaid Principal Balance (“UPB”)	$ 2,294,086	$ 3,592,701
Weighted Average Coupon	5.84%	5.96%
Weighted Average Term to Maturity (Months)	351 months	368 months
Weighted Average LTV Ratio	64.00%	67.00%
Weighted Average FICO Scores	712	716
Settled Whole Loans | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 563,430	$ 1,023,766
Amortized Cost Basis	581,801	1,026,097
Unpaid Principal Balance (“UPB”)	$ 581,801	$ 1,026,097
Weighted Average Coupon	7.29%	7.30%
Weighted Average Term to Maturity (Months)	3 months	8 months
Weighted Average LTV Ratio	63.00%	64.00%
Weighted Average FICO Scores	719	717
Settled Whole Loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 442,456	$ 460,679
Amortized Cost Basis	446,374	460,741
Unpaid Principal Balance (“UPB”)	$ 442,208	$ 457,146
Weighted Average Coupon	6.32%	6.29%
Weighted Average Term to Maturity (Months)	324 months	324 months
Weighted Average LTV Ratio	70.00%	70.00%
Weighted Average FICO Scores	730	734
Settled Whole Loans | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 136,157	$ 176,569
Amortized Cost Basis	136,264	176,569
Unpaid Principal Balance (“UPB”)	$ 149,004	$ 192,151
Weighted Average Coupon	3.30%	4.24%
Weighted Average Term to Maturity (Months)	171 months	181 months
Weighted Average LTV Ratio	40.00%	46.00%
Weighted Average FICO Scores	723	723
Settled Whole Loans | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased Credit Deteriorated Loans	$ 630,339	$ 698,474
Amortized Cost Basis	673,708	698,718
Unpaid Principal Balance (“UPB”)	$ 782,319	$ 873,326
Weighted Average Coupon	4.46%	4.46%
Weighted Average Term to Maturity (Months)	287 months	294 months
Weighted Average LTV Ratio	76.00%	81.00%
Settled Whole Loans | Certain rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased performing loans	$ 189,900	$ 269,200
Weighted Average LTV Ratio	68.00%	69.00%
Settled Whole Loans | Current | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	$ 2,099,134	$ 3,492,533
Settled Whole Loans | Current | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	390,706	868,281
Settled Whole Loans | Current | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	415,386	432,936
Settled Whole Loans | Current | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	124,877	187,683
Settled Whole Loans | 30-59 | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	73,163	59,963
Settled Whole Loans | 30-59 | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	29,315	67,747
Settled Whole Loans | 30-59 | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	6,652	15,948
Settled Whole Loans | 30-59 | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	2,186	2,164
Settled Whole Loans | 60-89 | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	36,501	19,605
Settled Whole Loans | 60-89 | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	25,433	27,437
Settled Whole Loans | 60-89 | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	3,948	2,047
Settled Whole Loans | 60-89 | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	1,170	430
Settled Whole Loans | 90 or more | Non-QM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	148,387	20,600
Settled Whole Loans | 90 or more | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	136,347	62,632
Settled Whole Loans | 90 or more | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	20,388	6,215
Settled Whole Loans | 90 or more | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	8,031	1,874
Settled Whole Loans | 90 or more | Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance (“UPB”)	$ 119,621	$ 108,998

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