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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total residential whole loans	$ 8,400,000	$ 8,400,000	$ 7,500,000
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Proceeds from issuance of debt		6,637,607	5,286,305
Residential whole loans transferred to consolidated VIEs	5,100,000	5,100,000	4,000,000
Securitized debt	4,300,000	4,300,000	3,400,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets
Variable Interest Entity [Line Items]
Real estate owned at fair value	32,100	32,100	$ 36,500
Senior Bonds
Variable Interest Entity [Line Items]
Proceeds from issuance of debt	534,800	1,400,000
Proceed from debt net of offering expenses and underwriting discount	$ 533,800	$ 1,400,000

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