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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, 2024 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |
Weighted average fixed rate for Senior Bonds issued | 4.52% | 4.33%
Senior Notes |  |
Variable Interest Entity [Line Items] |  |
Cash received | $ 160,000 |
Asset-backed Securities, Securitized Loans and Receivables |  |
Variable Interest Entity [Line Items] |  |
Aggregate unpaid principal balance of residential whole loans sold | 8,433,573 | $ 8,241,053
Outstanding amount of Senior Bonds, at carrying value | 728,770 | 765,433
Outstanding amount of Senior Bonds, at fair value | 4,065,630 | 3,985,372
Outstanding amount of Senior Bonds, total | $ 4,794,400 | $ 4,750,805
Weighted average fixed rate for Senior Bonds issued | 4.62% | 4.51%
Weighted average contractual maturity of Senior Bonds | 35 years | 36 years
Cash received | $ 7,249,574 | $ 7,089,575
Debt issuance cost | 1,400 | 1,500
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes |  |
Variable Interest Entity [Line Items] |  |
Debt instrument, face amount | 7,312,213 | 7,152,213
Proceeds from Senior bond sold with Step up feature | $ 3,400,000 | 3,400,000
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 | Variable Rate, Option 4 |  |
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 | 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 | $ 1,077,297 | $ 1,047,297

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