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Collateralized Debt Obligations - Schedule of Mortgages Payable in Consolidated VIEs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	3.00%	3.00%
Debt Instrument, Redemption, Period Two | Step-Up Interest Rate One
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%	1.00%
Debt Instrument, Redemption, Period Two | Step-Up Interest Rate Two
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.50%	1.50%
Debt Instrument, Redemption, Period Two | Step-Up Interest Rate Three
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	2.00%	2.00%
Debt Instrument, Redemption, Period Two | Step-Up Interest Rate Four
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	3.00%	3.00%
Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%	1.00%
Collateralized Debt Obligations | Secured Debt
Debt Instrument [Line Items]
Outstanding Face Amount	$ 2,863,210	$ 2,863,210	$ 1,944,948
Carrying Value	2,802,266	2,802,266	1,870,517
Collateralized Debt Obligations | Secured Debt | Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount	884,509	884,509	652,933
Carrying Value	$ 845,811	$ 845,811	$ 593,737
Weighted average interest rate	3.64%	3.64%	2.75%
Collateralized Debt Obligations | Secured Debt | Consolidated SLST | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Carrying Value	$ 194,836	$ 194,836
Collateralized Debt Obligations | Secured Debt | Consolidated SLST | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Carrying Value	1,222,103	1,222,103
Collateralized Debt Obligations | Secured Debt | Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount	994,220	994,220
Carrying Value	$ 981,779	$ 981,779
Weighted average interest rate	5.72%	5.72%
Unrealized losses recognized on CDOs	$ 19,500	$ 18,000
Collateralized Debt Obligations | Secured Debt | Residential loan securitizations at amortized cost, net
Debt Instrument [Line Items]
Outstanding Face Amount	912,260	912,260	$ 1,292,015
Carrying Value	$ 902,038	$ 902,038	$ 1,276,780
Weighted average interest rate	4.34%	4.34%	4.00%
Collateralized Debt Obligations | Secured Debt | Non-Agency RMBS re-securitization at fair value
Debt Instrument [Line Items]
Outstanding Face Amount	$ 72,221	$ 72,221
Carrying Value	$ 72,638	$ 72,638
Weighted average interest rate	7.38%	7.38%

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