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Residential Whole Loans - Residential Whole Loans, at Carrying Value Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV Ratio	80.00%
Settled Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	$ 6,793,604	$ 6,315,738
Unpaid Principal Balance (“UPB”)	$ 7,119,313	$ 6,189,012
Weighted Average Coupon	5.11%	5.05%
Weighted Average Term to Maturity (Months)	296 months	307 months
Settled Whole Loans | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	$ 3,487,780	$ 3,453,242
Unpaid Principal Balance (“UPB”)	$ 3,636,992	$ 3,361,164
Weighted Average Coupon	4.96%	5.07%
Weighted Average Term to Maturity (Months)	356 months	355 months
Weighted Average LTV Ratio	65.00%	66.00%
Weighted Average FICO Scores	734	731
Settled Whole Loans | Non-QM loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 3,465,427	$ 3,165,964
Settled Whole Loans | Non-QM loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	76,261	77,581
Settled Whole Loans | Non-QM loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	17,781	22,864
Settled Whole Loans | Non-QM loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	77,523	94,755
Settled Whole Loans | Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	1,038,770	727,964
Unpaid Principal Balance (“UPB”)	$ 1,044,722	$ 731,154
Weighted Average Coupon	7.18%	7.18%
Weighted Average Term to Maturity (Months)	13 months	11 months
Weighted Average LTV Ratio	67.00%	67.00%
Weighted Average FICO Scores	743	735
Settled Whole Loans | Rehabilitation loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 952,587	$ 616,733
Settled Whole Loans | Rehabilitation loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	3,230	5,834
Settled Whole Loans | Rehabilitation loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	6,913	5,553
Settled Whole Loans | Rehabilitation loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	81,992	103,034
Settled Whole Loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	1,261,946	949,772
Unpaid Principal Balance (“UPB”)	$ 1,319,956	$ 924,498
Weighted Average Coupon	5.40%	5.46%
Weighted Average Term to Maturity (Months)	326 months	329 months
Weighted Average LTV Ratio	70.00%	70.00%
Weighted Average FICO Scores	737	732
Settled Whole Loans | Single-family rental loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 1,283,285	$ 898,166
Settled Whole Loans | Single-family rental loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	5,169	2,150
Settled Whole Loans | Single-family rental loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	2,009	695
Settled Whole Loans | Single-family rental loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	29,493	23,487
Settled Whole Loans | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	92,863	101,995
Unpaid Principal Balance (“UPB”)	$ 101,811	$ 111,710
Weighted Average Coupon	2.82%	2.76%
Weighted Average Term to Maturity (Months)	156 months	162 months
Weighted Average LTV Ratio	31.00%	37.00%
Weighted Average FICO Scores	722	722
Settled Whole Loans | Seasoned performing loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 93,000	$ 102,047
Settled Whole Loans | Seasoned performing loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	807	938
Settled Whole Loans | Seasoned performing loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	577	481
Settled Whole Loans | Seasoned performing loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	7,427	8,244
Settled Whole Loans | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	912,245	1,082,765
Unpaid Principal Balance (“UPB”)	$ 1,015,832	$ 1,060,486
Weighted Average Coupon	3.40%	3.40%
Weighted Average Term to Maturity (Months)	348 months	354 months
Weighted Average LTV Ratio	61.00%	62.00%
Weighted Average FICO Scores	767	767
Settled Whole Loans | Agency eligible investor loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 1,011,769	$ 1,039,257
Settled Whole Loans | Agency eligible investor loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	2,653	21,229
Settled Whole Loans | Agency eligible investor loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	596	0
Settled Whole Loans | Agency eligible investor loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	814	0
Settled Whole Loans | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	474,919	524,992
Unpaid Principal Balance (“UPB”)	$ 587,058	$ 643,187
Weighted Average Coupon	4.57%	4.55%
Weighted Average Term to Maturity (Months)	280 months	283 months
Weighted Average LTV Ratio	65.00%	69.00%
Settled Whole Loans | Purchased Credit Deteriorated Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 425,803	$ 456,924
Settled Whole Loans | Purchased Credit Deteriorated Loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	40,047	50,048
Settled Whole Loans | Purchased Credit Deteriorated Loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	17,416	18,736
Settled Whole Loans | Purchased Credit Deteriorated Loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	103,792	117,479
Settled Whole Loans | Purchased Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	922,058	1,072,270
Unpaid Principal Balance (“UPB”)	$ 969,007	$ 1,073,544
Weighted Average Coupon	4.92%	4.87%
Weighted Average Term to Maturity (Months)	280 months	283 months
Weighted Average LTV Ratio	70.00%	73.00%
Settled Whole Loans | Purchased Non-Performing Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 460,929	$ 492,481
Settled Whole Loans | Purchased Non-Performing Loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	83,631	87,041
Settled Whole Loans | Purchased Non-Performing Loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	34,546	40,876
Settled Whole Loans | Purchased Non-Performing Loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	389,901	453,146
Settled Whole Loans | Residential whole loans, total or weighted average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Purchased Performing Loans	8,190,581	7,913,000
Unpaid Principal Balance (“UPB”)	$ 8,675,378	$ 7,905,743
Weighted Average Coupon	5.06%	4.99%
Weighted Average Term to Maturity (Months)	293 months	301 months
Settled Whole Loans | Certain rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV Ratio	72.00%	71.00%

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