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Residential Whole Loans - LTV on Loans (Details) - 90 or more $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 206,277	$ 230,903
UPB	205,721	229,520
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	721,338	781,245
UPB	744,189	800,145
Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	424,871	454,443
UPB	$ 426,578	$ 453,146
LTV (as a percent)	0.794	0.802
Non-QM loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 91,200	$ 96,473
UPB	$ 90,126	$ 94,755
LTV (as a percent)	0.656	0.646
Rehabilitation loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 86,272	$ 103,166
UPB	$ 86,280	$ 103,034
LTV (as a percent)	0.733	0.676
Single-family rental loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 20,845	$ 23,524
UPB	$ 20,799	$ 23,487
LTV (as a percent)	0.735	0.734
Seasoned performing loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 7,780	$ 7,740
UPB	$ 8,324	$ 8,244
LTV (as a percent)	0.437	0.456
Agency eligible investor loans | Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 180	$ 0
UPB	$ 192	$ 0
LTV (as a percent)	0.737	0
Purchased Credit Deteriorated Loans | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Value / Fair Value	$ 90,190	$ 95,899
UPB	$ 111,890	$ 117,479
LTV (as a percent)	0.782	0.791

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