Collateralized Debt Obligations - Schedule of Mortgages Payable in Consolidated VIEs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Carrying Value	$ 3,791,951		$ 3,791,951		$ 3,511,802
Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate increases, months after issuance			30 months
Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate increases, months after issuance			48 months
Step-Up Interest Rate One
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%		1.00%
Step-Up Interest Rate Two
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	3.00%		3.00%
Collateralized Debt Obligations \| Secured Debt
Debt Instrument [Line Items]
Outstanding Face Amount	$ 3,963,626		$ 3,963,626		3,587,998
Carrying Value	3,791,951		3,791,951		3,511,802
Collateralized Debt Obligations \| Secured Debt \| Consolidated SLST at fair value
Debt Instrument [Line Items]
Outstanding Face Amount	992,175		992,175		1,055,791
Carrying Value	$ 915,698		$ 915,698		$ 1,006,919
Weighted average interest rate	3.21%		3.21%		3.30%
Collateralized Debt Obligations \| Secured Debt \| Consolidated SLST at fair value \| Interest Rate Step-Up
Debt Instrument [Line Items]
Outstanding Face Amount	$ 2,300,000		$ 2,300,000
Collateralized Debt Obligations \| Secured Debt \| Residential loan securitizations at fair value
Debt Instrument [Line Items]
Outstanding Face Amount	2,532,592		2,532,592		$ 2,103,164
Carrying Value	$ 2,438,853		$ 2,438,853		$ 2,075,962
Weighted average interest rate	5.13%		5.13%		5.35%
Unrealized gains (losses) recognized on CDOs	$ 44,500	$ (8,800)	$ 67,400	$ (20,900)
Collateralized Debt Obligations \| Secured Debt \| Residential loan securitizations at amortized cost, net
Debt Instrument [Line Items]
Outstanding Face Amount	328,746		328,746		$ 363,712
Carrying Value	$ 328,681		$ 328,681		$ 363,645
Weighted average interest rate	3.77%		3.77%		3.74%
Collateralized Debt Obligations \| Secured Debt \| Non-Agency RMBS re-securitization at fair value
Debt Instrument [Line Items]
Outstanding Face Amount	$ 110,113		$ 110,113		$ 65,331
Carrying Value	$ 108,719		$ 108,719		$ 65,276
Weighted average interest rate	6.88%		6.88%		7.38%