v3.26.3
Use of Special Purpose Entities and Variable Interest Entities - Schedule of Loan Securitization Transaction (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
Weighted average rate for Senior Bonds issued 4.38%   4.38%   4.51%
Asset-backed Securities, Securitized Loans and Receivables          
Variable Interest Entity [Line Items]          
Aggregate unpaid principal balance of residential whole loans sold $ 11,393,699   $ 11,393,699   $ 11,489,998
Outstanding amount of Senior Bonds, at carrying value 420,868   420,868   489,718
Outstanding amount of Senior Bonds, at fair value 5,518,943   5,518,943   5,846,744
Outstanding amount of Senior Bonds, total $ 5,939,811   $ 5,939,811   $ 6,336,462
Weighted average rate for Senior Bonds issued 5.09%   5.09%   5.07%
Weighted average contractual maturity of Senior Bonds     37 years   37 years
Cash received     $ 10,298,145   $ 10,061,131
Debt issuance cost $ 700   $ 700   $ 900
Percentage of debt with fixed rate 99.00%   99.00%   99.60%
Percentage of debt with variable rate 1.00%   1.00%   0.40%
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes          
Variable Interest Entity [Line Items]          
Debt instrument, face amount $ 10,368,724   $ 10,368,724   $ 10,142,071
Cash received 384,000 $ 672,800 1,900,000 $ 1,200,000  
Proceeds from Senior bond sold with Step up feature     $ 4,500,000   4,700,000
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Minimum          
Variable Interest Entity [Line Items]          
Debt instrument, coupon step-up period     36 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 Notes | Variable Rate, Option 1          
Variable Interest Entity [Line Items]          
Debt instrument, basis spread on variable rate (as a 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 (as a percent)     3.00%    
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 (as a percent)     4.00%    
Asset-backed Securities, Securitized Loans and Receivables | Senior Support Certificates          
Variable Interest Entity [Line Items]          
Debt instrument, face amount $ 980,044   $ 980,044   $ 1,307,153