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Use of Special Purpose Entities and Variable Interest Entities - Loan Securitization Transaction (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate unpaid principal balance of residential whole loans sold | $ 5,604,714 | $ 5,604,714 | $ 3,984,355
Outstanding amount of Senior Bonds, at carrying value | 1,050,998 | 1,050,998 | 1,334,342
Outstanding amount of Senior Bonds, at fair value | 2,323,718 | 2,323,718 | 1,316,131
Outstanding amount of Senior Bonds, total | $ 3,374,716 | $ 3,374,716 | $ 2,650,473
Weighted average interest rate | 2.91% | 2.91% | 2.01%
Weighted average contractual maturity of Senior Bonds |  | 37 years | 36 years
Cash received |  | $ 5,040,474 | $ 3,682,082
Debt issuance cost | $ 4,000 | 4,000 | 6,800
Senior Notes |  |  |
Variable Interest Entity [Line Items] |  |  |
Cash received | 860,900 |  |
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt instrument, face amount | 5,042,556 | 5,042,556 | 3,667,790
Proceeds from Senior bond sold with Step up feature |  | $ 1,400,000 | 329,000
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |
Debt instrument, coupon step-up period |  | 30 months |
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 3.00% |
Debt instrument, coupon step-up period |  | 36 months |
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables | Median |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |
Senior Support Certificates | Asset-backed Securities, Securitized Loans and Receivables |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt instrument, face amount | $ 529,502 | $ 529,502 | $ 283,930

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