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Collateralized Debt Obligations - Summary of Debt (Details) - Secured Debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020	Mar. 31, 2021
Debt Instrument [Line Items]
Outstanding Face Amount			$ 1,484,831
Collateralized debt, carrying value			1,526,110
Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount			947,719
Collateralized debt, carrying value			992,288
Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount			537,112
Collateralized debt, carrying value			$ 533,822
Collateralized Debt Obligations
Debt Instrument [Line Items]
Outstanding Face Amount		$ 1,547,963
Collateralized debt, carrying value		1,623,658
Collateralized Debt Obligations | Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount		975,017
Collateralized debt, carrying value		$ 1,054,335
Weighted average interest rate		2.75%	2.75%
Weighted Average Rate of Notes Issued		3.53%	3.53%
Collateralized Debt Obligations | Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount		$ 557,497
Collateralized debt, carrying value		$ 554,067
Weighted average interest rate		3.36%	3.36%
Weighted Average Rate of Notes Issued		4.83%	4.84%
Collateralized Debt Obligations | Non-Agency RMBS Re-Securitization
Debt Instrument [Line Items]
Outstanding Face Amount		$ 15,449
Collateralized debt, carrying value		$ 15,256
Collateralized Debt Obligations | Non-Agency RMBS Re-Securitization | LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread		0.0525%
Collateralized Debt Obligations | Non-Agency RMBS Re-Securitization | LIBOR | Forecast | Subsequent Event
Debt Instrument [Line Items]
Interest rate, basis spread	7.75%

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-Publisher FASB
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-SubTopic 30
-Section 45
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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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