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Collateralized Debt Obligations - Summary of Debt (Details) - Collateralized Debt Obligations - Secured Debt - USD ($) $ in Thousands		3 Months Ended
	Feb. 01, 2022	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding Face Amount			$ 1,595,107	$ 1,547,963
Collateralized debt, carrying value			1,631,814	1,623,658
Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount			906,703	975,017
Collateralized debt, carrying value			$ 948,090	$ 1,054,335
Weighted average interest rate			2.75%	2.75%
Weighted Average Rate of Notes Issued			3.53%	3.53%
Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount			$ 688,404	$ 557,497
Collateralized debt, carrying value			$ 683,724	$ 554,067
Weighted average interest rate			3.10%	3.36%
Weighted Average Rate of Notes Issued			4.35%	4.83%
Non-Agency RMBS Re-Securitization
Debt Instrument [Line Items]
Outstanding Face Amount				$ 15,449
Collateralized debt, carrying value				$ 15,256
Non-Agency RMBS Re-Securitization | LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread		0.0525%
Non-Agency RMBS Re-Securitization | LIBOR | Forecast | Subsequent Event
Debt Instrument [Line Items]
Interest rate, basis spread	7.75%

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