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Collateralized Debt Obligations - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	3.00%
Debt Instrument, Redemption, Period Two | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%
Debt Instrument, Redemption, Period Two | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	2.00%
Debt Instrument, Redemption, Period Two | Weighted Average
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.50%
Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%
Collateralized Debt Obligations | Secured Debt
Debt Instrument [Line Items]
Outstanding Face Amount	$ 2,292,656	$ 1,944,948
Carrying Value	2,188,362	1,870,517
Collateralized Debt Obligations | Secured Debt | Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount	640,426	652,933
Carrying Value	$ 582,627	$ 593,737
Weighted average interest rate	2.75%	2.75%
Collateralized Debt Obligations | Secured Debt | Consolidated SLST | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Carrying Value	$ 389,685
Collateralized Debt Obligations | Secured Debt | Consolidated SLST | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Carrying Value	721,455
Collateralized Debt Obligations | Secured Debt | Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount	528,534
Carrying Value	$ 497,141
Weighted average interest rate	5.28%
Collateralized Debt Obligations | Secured Debt | Residential loan securitizations at amortized cost
Debt Instrument [Line Items]
Outstanding Face Amount	$ 1,123,696	$ 1,292,015
Carrying Value	$ 1,108,594	$ 1,276,780
Weighted average interest rate	3.73%	4.00%

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