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Residential Whole Loans - LTV on Loans (Details) - Financial Asset, Equal to or Greater than 60 Days Past Due $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 229,972	$ 166,671
UPB	244,880	167,761
Carrying Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	84,584	61,812
UPB	$ 86,761	$ 61,719
LTV (as a percent)	0.669	0.679
Carrying Value | Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 86,451	$ 73,266
UPB	$ 90,785	$ 74,180
LTV (as a percent)	0.650	0.681
Carrying Value | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 55,313	$ 27,466
UPB	$ 63,642	$ 27,463
LTV (as a percent)	0.733	0.729
Carrying Value | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 3,437	$ 4,127
UPB	$ 3,464	$ 4,399
LTV (as a percent)	0.299	0.422
Carrying Value | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 187	$ 0
UPB	$ 228	$ 0
LTV (as a percent)	0.734	0
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 538,366	$ 532,770
UPB	585,220	565,284
Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	238,545	296,697
UPB	$ 253,510	$ 310,035
LTV (as a percent)	0.708	0.769
Fair Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 69,849	$ 69,402
UPB	$ 86,830	$ 87,488
LTV (as a percent)	0.641	0.748

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