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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]          
Weighted average rate for Senior Bonds issued 4.64%   4.64%   4.47%
Asset-backed Securities, Securitized Loans and Receivables          
Variable Interest Entity [Line Items]          
Aggregate unpaid principal balance of residential whole loans sold $ 11,269,588   $ 11,269,588   $ 9,924,643
Outstanding amount of Senior Bonds, at carrying value 506,727   506,727   583,597
Outstanding amount of Senior Bonds, at fair value 5,847,247   5,847,247   5,211,380
Outstanding amount of Senior Bonds, total $ 6,353,974   $ 6,353,974   $ 5,794,977
Weighted average rate for Senior Bonds issued 5.16%   5.16%   5.02%
Weighted average contractual maturity of Senior Bonds     36 years   36 years
Cash received     $ 9,821,597   $ 8,574,069
Debt issuance cost $ 900   $ 900   1,100
Percentage of debt with fixed rate 99.60%   99.60%    
Percentage of debt with variable rate 0.40%   0.40%    
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes          
Variable Interest Entity [Line Items]          
Debt instrument, face amount $ 9,902,550   $ 9,902,550   8,655,017
Cash received 672,800 $ 579,500 1,200,000 $ 1,200,000  
Proceeds from Senior bond sold with Step up feature     $ 4,800,000   4,200,000
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)     3.00%    
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes | Minimum          
Variable Interest Entity [Line Items]          
Debt instrument, coupon step-up period     30 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 $ 1,319,362   $ 1,319,362   $ 1,222,029