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Collateralized Debt Obligations - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	3.00%
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%
Debt Instrument, Redemption, Period Three | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%
Debt Instrument, Redemption, Period Three | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	2.00%
Collateralized Debt Obligations | Secured Debt
Debt Instrument [Line Items]
Outstanding Face Amount	$ 2,001,568	$ 2,197,606
Carrying Value	1,902,872	2,102,717
Collateralized Debt Obligations | Secured Debt | Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount	665,970	699,408
Carrying Value	$ 584,741	$ 634,495
Weighted average interest rate	2.75%	2.75%
Collateralized Debt Obligations | Secured Debt | Consolidated SLST | Debt Instrument, Redemption, Periods One And Two
Debt Instrument [Line Items]
Carrying Value	$ 560,800	$ 647,100
Collateralized Debt Obligations | Secured Debt | Consolidated SLST | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Carrying Value	548,400	603,800
Collateralized Debt Obligations | Secured Debt | Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount	1,335,598	1,498,198
Carrying Value	$ 1,318,131	$ 1,468,222
Weighted average interest rate	3.63%	3.54%

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