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Residential Whole Loans (LTV on Loans) (Details) - 90 Days or More Delinquent $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 355,096	$ 432,774
UPB	375,946	455,112
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	494,901	571,729
UPB	496,694	625,621
Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	484,510	571,729
UPB	$ 485,998	$ 625,621
LTV (as a percent)	0.812	0.868
Fair Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 10,391	$ 0
UPB	$ 10,696	$ 0
LTV (as a percent)	0.627	0
Purchased credit deteriorated loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 100,905	$ 119,621
UPB	$ 123,189	$ 145,028
LTV (as a percent)	0.798	0.867
Non-QM loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 121,741	$ 148,387
UPB	$ 119,572	$ 144,681
LTV (as a percent)	0.645	0.659
Rehabilitation loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 101,012	$ 136,347
UPB	$ 101,012	$ 136,347
LTV (as a percent)	0.686	0.658
Single-family rental loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 22,767	$ 20,388
UPB	$ 22,771	$ 20,233
LTV (as a percent)	0.736	0.727
Seasoned performing loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 8,671	$ 8,031
UPB	$ 9,402	$ 8,823
LTV (as a percent)	0.513	0.551

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