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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, 2024
Mar. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]        
Weighted average fixed rate for Senior Bonds issued 4.63%   4.63% 4.33%
Asset-backed Securities, Securitized Loans and Receivables        
Variable Interest Entity [Line Items]        
Aggregate unpaid principal balance of residential whole loans sold $ 8,664,831   $ 8,664,831 $ 8,241,053
Outstanding amount of Senior Bonds, at carrying value 632,912   632,912 765,433
Outstanding amount of Senior Bonds, at fair value 4,414,701   4,414,701 3,985,372
Outstanding amount of Senior Bonds, total $ 5,047,613   $ 5,047,613 $ 4,750,805
Weighted average fixed rate for Senior Bonds issued 4.88%   4.88% 4.51%
Weighted average contractual maturity of Senior Bonds     34 years 36 years
Cash received     $ 7,504,463 $ 7,089,575
Debt issuance cost $ 1,300   1,300 1,500
Asset-backed Securities, Securitized Loans and Receivables | Senior Notes        
Variable Interest Entity [Line Items]        
Debt instrument, face amount 7,567,271   7,567,271 7,152,213
Cash received 160,000   655,100  
Proceeds from Senior bond sold with Step up feature   $ 3,400,000 $ 3,700,000  
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 | 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 $ 1,083,414   $ 1,083,414 $ 1,047,297