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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |  |  |
Weighted average fixed rate for Senior Bonds issued | 4.63% |  | 4.63% | 4.33%
Asset-backed Securities, Securitized Loans and Receivables |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Aggregate unpaid principal balance of residential whole loans sold | $ 8,664,831 |  | $ 8,664,831 | $ 8,241,053
Outstanding amount of Senior Bonds, at carrying value | 632,912 |  | 632,912 | 765,433
Outstanding amount of Senior Bonds, at fair value | 4,414,701 |  | 4,414,701 | 3,985,372
Outstanding amount of Senior Bonds, total | $ 5,047,613 |  | $ 5,047,613 | $ 4,750,805
Weighted average fixed rate for Senior Bonds issued | 4.88% |  | 4.88% | 4.51%
Weighted average contractual maturity of Senior Bonds |  |  | 34 years | 36 years
Cash received |  |  | $ 7,504,463 | $ 7,089,575
Debt issuance cost | $ 1,300 |  | 1,300 | 1,500
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Debt instrument, face amount | 7,567,271 |  | 7,567,271 | 7,152,213
Cash received | 160,000 |  | 655,100 |
Proceeds from Senior bond sold with Step up feature |  | $ 3,400,000 | $ 3,700,000 |
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) |  |  | 2.00% |
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Minimum |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Debt instrument, coupon step-up period |  |  | 24 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 | $ 1,083,414 |  | $ 1,083,414 | $ 1,047,297

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