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Residential Whole Loans (Details) $ in Thousands	Jun. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,063,215
Allowance for Credit Losses	(36,927)	$ (39,447)
Total Residential Whole Loans	$ 8,190,581	$ 7,913,000
Number of loans | loan	25,575	24,095
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Credit Losses	$ (36,927)	$ (39,447)
Total Residential Whole Loans	$ 2,026,288	$ 2,607,651
Number of loans | loan	7,813	9,361
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Credit Losses	$ 0	$ 0
Total Residential Whole Loans	$ 6,164,293	$ 5,305,349
Number of loans | loan	17,762	14,734
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,807,133	$ 6,332,405
Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,564,898	2,099,326
Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,242,235	4,233,079
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	922,058	1,072,270
Nonperforming | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Nonperforming | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	922,058	1,072,270
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,113,696
Non-QM loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,494,910	3,461,531
Non-QM loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,113,696	1,448,162
Non-QM loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,381,214	2,013,369
Rehabilitation loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	111,164
Rehabilitation loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,043,831	734,845
Rehabilitation loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	111,164	217,315
Rehabilitation loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	932,667	517,530
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	247,129
Single-family rental loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,263,238	951,223
Single-family rental loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	247,129	331,808
Single-family rental loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,016,109	619,415
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	92,909
Seasoned performing loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	92,909	102,041
Seasoned performing loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	92,909	102,041
Seasoned performing loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Agency eligible investor loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	912,245	1,082,765
Agency eligible investor loans | Performing | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Agency eligible investor loans | Performing | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	912,245	1,082,765
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	498,317	547,772
Purchased Credit Deteriorated Loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	498,317	547,772
Purchased Credit Deteriorated Loans | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0	$ 0

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