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Use of Special Purpose Entities and Variable Interest Entities - Loan Securitization Transaction (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 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 | $ 4,554,495 | $ 3,984,355
Outstanding amount of Senior Bonds, at carrying value | 1,173,265 | 1,334,342
Outstanding amount of Senior Bonds, at fair value | 1,685,796 | 1,316,131
Outstanding amount of Senior Bonds, total | $ 2,859,061 | $ 2,650,473
Weighted average interest rate | 2.41% | 2.01%
Weighted average contractual maturity of Senior Bonds | 38 years | 36 years
Cash received | $ 4,193,362 | $ 3,682,082
Debt issuance cost | 5,600 | 6,800
Senior Notes |  |
Variable Interest Entity [Line Items] |  |
Cash received | 513,900 |
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables |  |
Variable Interest Entity [Line Items] |  |
Debt instrument, face amount | 4,181,681 | 3,667,790
Proceeds from Senior bond sold with Step up feature | $ 707,600 | 329,000
Debt instrument, coupon step-up period | 36 months |
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables | Minimum |  |
Variable Interest Entity [Line Items] |  |
Debt instrument, basis spread on variable rate | 1.00% |
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables | Maximum |  |
Variable Interest Entity [Line Items] |  |
Debt instrument, basis spread on variable rate | 3.00% |
Senior Support Certificates | Asset-backed Securities, Securitized Loans and Receivables |  |
Variable Interest Entity [Line Items] |  |
Debt instrument, face amount | $ 339,975 | $ 283,930

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