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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 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
Weighted average rate for Senior Bonds issued 4.40%   4.40%   4.51%
Asset-backed Securities, Securitized Loans and Receivables          
Variable Interest Entity [Line Items]          
Aggregate unpaid principal balance of residential whole loans sold $ 11,370,985   $ 11,370,985   $ 11,489,998
Outstanding amount of Senior Bonds, at carrying value 447,153   447,153   489,718
Outstanding amount of Senior Bonds, at fair value 5,756,179   5,756,179   5,846,744
Outstanding amount of Senior Bonds, total $ 6,203,332   $ 6,203,332   $ 6,336,462
Weighted average rate for Senior Bonds issued 5.07%   5.07%   5.07%
Weighted average contractual maturity of Senior Bonds     39 years   37 years
Cash received     $ 10,220,276   $ 10,061,131
Debt issuance cost $ 800   $ 800   $ 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 $ 10,290,858   $ 10,290,858   $ 10,142,071
Cash received 772,200 $ 291,300 1,500,000 $ 574,700  
Proceeds from Senior bond sold with Step up feature     $ 4,600,000   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 Support Certificates          
Variable Interest Entity [Line Items]          
Debt instrument, face amount $ 1,039,123   $ 1,039,123   $ 1,307,153