Securitized Debt - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Gains (losses) on extinguishment of debt	$ 0	$ 2,309
Variable Interest Entities, Primary Beneficiary | Non-Agency RMBS | Securitized Loans
Debt Instrument [Line Items]
Principal balance	$ 110,000		$ 110,000
Weighted average cost of financing (as a percent)	6.70%		6.70%
Variable Interest Entities, Primary Beneficiary | Securitized debt | Securitized Loans
Debt Instrument [Line Items]
Principal balance	$ 8,100,000		$ 8,400,000
Weighted average cost of financing (as a percent)	3.40%		3.40%
Acquired securitized debt collateral outstanding principal balance		339,000
Repurchase of non retained secured debt		337,000
Gains (losses) on extinguishment of debt		$ 2,000