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Fair Value Measurements - Schedule of Sensitivity of Loans HFI at Fair Value to Adverse Changes in Key Assumptions (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2026 | Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for investment at fair value | $ 3,858,118 | $ 2,235,710
Loans held for investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for investment at fair value | 2,085,066 | 473,314
Discount rates, impact of 100 basis point increase | (29,672) | (2,832)
Discount rates, impact of 200 basis point increase | (58,442) | (5,633)
Expected credit loss rates on underlying loans, impact of 10% increase | (22,396) | (5,738)
Expected credit loss rates on underlying loans, impact of 20% increase | (42,903) | (13,161)
Expected prepayment rates, impact of 10% increase | (8,147) | (2,490)
Expected prepayment rates, impact of 20% increase | $ (16,582) | $ (4,979)
Loans held for investment | Weighted Average | Expected weighted-average life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Expected remaining weighted-average life (in years) | 1 year 7 months 6 days | 8 months 12 days

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