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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total residential whole loans	$ 9,100,000	$ 9,000,000
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Proceeds from issuance of debt	7,249,574	7,089,575
Residential whole loans transferred to consolidated VIEs	5,700,000	5,700,000
Securitized debt	4,800,000	4,800,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets
Variable Interest Entity [Line Items]
Real estate owned at fair value	31,900	$ 33,300
Senior Bonds
Variable Interest Entity [Line Items]
Proceeds from issuance of debt	160,000
Proceed from debt net of offering expenses and underwriting discount	$ 160,000

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