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Collateralized Debt Obligations - Summary of Debt (Details) - Collateralized Debt Obligations - Secured Debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021
Debt Instrument [Line Items]
Outstanding Face Amount	$ 1,547,963	$ 1,575,242
Collateralized debt, carrying value	1,623,658	1,615,078
Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount	975,017	861,184
Collateralized debt, carrying value	$ 1,054,335	$ 904,976
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	$ 557,497	$ 714,058
Collateralized debt, carrying value	$ 554,067	$ 710,102
Weighted average interest rate	3.36%	2.42%
Weighted Average Rate of Notes Issued	4.83%	3.38%
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%

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