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Use of Special Purpose Entities and Variable Interest Entities (Loan Securitization Transaction) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Asset-backed Securities, Securitized Loans and Receivables |  |
Variable Interest Entity [Line Items] |  |
Aggregate unpaid principal balance of residential whole loans sold | $ 3,984,355 | $ 2,232,561
Outstanding amount of Senior Bonds, at carrying value | 1,334,342 | 645,027
Outstanding amount of Senior Bonds, at fair value | 1,316,131 | 869,482
Outstanding amount of Senior Bonds, total | $ 2,650,473 | $ 1,514,509
Weighted average fixed rate for Senior Bonds issued | 1.58% | 2.11%
Weighted average contractual maturity of Senior Bonds | 36 years | 41 years
Cash received | $ 3,682,082 | $ 1,853,408
Debt issuance cost | 6,800 | 3,200
Senior Notes |  |
Variable Interest Entity [Line Items] |  |
Cash received | 2,400,000 | 1,300,000
Senior Notes | Asset-backed Securities, Securitized Loans and Receivables |  |
Variable Interest Entity [Line Items] |  |
Debt instrument, face amount | 3,667,790 | 1,862,068
Proceeds from Senior bond sold with Step up feature | $ 329,000 | 568,700
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 | $ 283,930 | $ 268,548

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