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Use of Special Purpose Entities and Variable Interest Entities - Schedule of Loan Securitization Transaction (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Weighted average fixed rate for Senior Bonds issued	4.68%		4.47%
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Aggregate unpaid principal balance of residential whole loans sold	$ 10,229,681		$ 9,924,643
Outstanding amount of Senior Bonds, at carrying value	556,688		583,597
Outstanding amount of Senior Bonds, at fair value	5,317,030		5,211,380
Outstanding amount of Senior Bonds, total	$ 5,873,718		$ 5,794,977
Weighted average fixed rate for Senior Bonds issued	5.07%		5.02%
Weighted average contractual maturity of Senior Bonds	36 years		36 years
Cash received	$ 8,857,447		$ 8,574,069
Debt issuance cost	1,100		1,100
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes
Variable Interest Entity [Line Items]
Debt instrument, face amount	8,938,397		8,655,017
Cash received	283,400	$ 160,000
Proceeds from Senior bond sold with Step up feature	$ 4,300,000		4,200,000
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Variable Rate, Option 1
Variable Interest Entity [Line Items]
Debt instrument, basis spread on variable rate (in percent)	1.00%
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Variable Rate, Option 2
Variable Interest Entity [Line Items]
Debt instrument, basis spread on variable rate (in percent)	1.50%
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Variable Rate, Option 3
Variable Interest Entity [Line Items]
Debt instrument, basis spread on variable rate (in percent)	3.00%
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Minimum
Variable Interest Entity [Line Items]
Debt instrument, coupon step-up period	30 months
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Maximum
Variable Interest Entity [Line Items]
Debt instrument, coupon step-up period	48 months
Asset-backed Securities, Securitized Loans and Receivables | Senior Support Certificates
Variable Interest Entity [Line Items]
Debt instrument, face amount	$ 1,243,687		$ 1,222,029

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