Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) entity	Jun. 30, 2024 USD ($) entity	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items]
Number of special purpose entity | entity	1	1
VIEs maximum loss exposure, amount			$ 18,400
Total residential whole loans			8,800,000	$ 9,000,000
Other loans
Variable Interest Entity [Line Items]
Amount derecognized					$ 598,000
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Proceeds from issuance of debt			8,574,069	7,089,575
Residential whole loans, carrying value			6,900,000	5,700,000
Securitized debt			5,800,000	4,800,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets
Variable Interest Entity [Line Items]
Real estate owned at fair value			26,900	33,300
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Proceeds from issuance of debt			2,100,000	1,800,000
Proceed from debt net of offering expenses and underwriting discount			$ 2,100,000	$ 1,800,000
Repayments of debt	$ 176,300	$ 68,100
Securitized debt
Variable Interest Entity [Line Items]
Financing receivable, sale					$ 567,200