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Residential Whole Loans - LTV on Loans (Details) - Financial Asset, Equal to or Greater than 60 Days Past Due $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Held at Carrying Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 284,391	$ 166,671
UPB	307,732	167,761
Held at Carrying Value | Non-QM loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	102,252	61,812
UPB	$ 104,454	$ 61,719
LTV (as a percent)	0.639	0.679
Held at Carrying Value | Transitional loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 113,772	$ 73,266
UPB	$ 119,936	$ 74,180
LTV (as a percent)	0.651	0.681
Held at Carrying Value | Single-family rental loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 65,659	$ 27,466
UPB	$ 80,570	$ 27,463
LTV (as a percent)	1.091	0.729
Held at Carrying Value | Seasoned performing loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 2,520	$ 4,127
UPB	$ 2,544	$ 4,399
LTV (as a percent)	0.336	0.422
Held at Carrying Value | Agency eligible investor loans | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 188	$ 0
UPB	$ 228	$ 0
LTV (as a percent)	0.734	0
Estimate of Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 572,799	$ 532,770
UPB	621,641	565,284
Estimate of Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	222,319	296,697
UPB	$ 231,782	$ 310,035
LTV (as a percent)	0.707	0.769
Estimate of Fair Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 66,089	$ 69,402
UPB	$ 82,127	$ 87,488
LTV (as a percent)	0.643	0.748

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