v3.26.1
Fair Value Measurements - Narrative (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
investment
loan
Dec. 31, 2025
USD ($)
loan
investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value $ 7,890,790,000 $ 9,803,615,000
Transfers into Level 3 0 0
Transfers out of Level 3 $ 0 0
2 Year U.S. Treasury Future | U.S. Treasury futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Length of contract 2 years  
5 Year U.S. Treasury Future | U.S. Treasury futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Length of contract 5 years  
30 Year Mortgage-Backed Securities Futures | U.S. Treasury futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Length of contract 30 years  
Investments with Difference Between Model Price and Third-Party Price | Securitized debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Excess of third party prices over (under) internally developed price, assets $ 216,000 $ 183,000
Investments with Difference Between Model Price and Third-Party Price | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans internally valued lower than third party prices | investment 0 1
Excess of third party prices over (under) internally developed price, assets   $ 701,000
Investments with Difference Between Model Price and Third-Party Price | Securitized Loans Held For Investment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Excess of third party prices over (under) internally developed price, assets $ 62,000,000 $ 17,000,000
Internal Assessment | Investments with Difference Between Model Price and Third-Party Price | Securitized debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans internally valued lower than third party prices | investment 1 1
Assets, fair value disclosure $ 3,000,000 $ 3,000,000
Internal Assessment | Investments with Difference Between Model Price and Third-Party Price | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure   $ 5,000,000
Internal Assessment | Investments with Difference Between Model Price and Third-Party Price | Securitized Loans Held For Investment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans internally valued lower than third party prices | loan 4 2
Assets, fair value disclosure $ 1,200,000,000 $ 272,000,000
Third Party Assessment | Investments with Difference Between Model Price and Third-Party Price | Securitized debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Excess of third party prices over (under) internally developed price, assets 3,000,000 3,000,000
Third Party Assessment | Investments with Difference Between Model Price and Third-Party Price | Mortgage Backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure   5,000,000
Third Party Assessment | Investments with Difference Between Model Price and Third-Party Price | Securitized Loans Held For Investment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Excess of third party prices over (under) internally developed price, assets $ 1,100,000,000 $ 255,000,000