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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Loans held for sale at fair value | $ 1,773,052 |  | $ 1,762,396 |  |  |
Loans held for investment at fair value | 2,085,066 |  | 473,314 |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 4,046,761 |  | 3,706,709 |  |  |
Servicing assets | 72,974 | $ 67,078 | 65,167 | $ 57,909 | $ 56,904 | $ 60,697
Other assets | 10,820 |  | 2,099 |  |  |
Total assets | 7,988,673 |  | 6,009,685 |  |  |
Liabilities: |  |  |  |  |  |
Other liabilities | 1,845 |  | 5,783 |  |  |
Total liabilities | 1,845 |  | 5,783 |  |  |
Senior asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 3,394,054 |  | 3,092,410 |  |  |
Other asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 257,820 |  | 219,370 |  |  |
U.S. agency residential mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 243,375 |  | 236,061 |  |  |
U.S. agency securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 70,282 |  | 73,862 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 53,806 |  | 55,597 |  |  |
Municipal securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 2,678 |  | 2,606 |  |  |
Other securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 24,746 |  | 26,803 |  |  |
Level 1 |  |  |  |  |  |
Assets |  |  |  |  |  |
Loans held for sale at fair value | 0 |  | 0 |  |  |
Loans held for investment at fair value | 0 |  | 0 |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Servicing assets | 0 |  | 0 |  |  |
Other assets | 0 |  | 0 |  |  |
Total assets | 0 |  | 0 |  |  |
Liabilities: |  |  |  |  |  |
Other liabilities | 0 |  | 0 |  |  |
Total liabilities | 0 |  | 0 |  |  |
Level 1 | Senior asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 1 | Other asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 1 | U.S. agency residential mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 1 | U.S. agency securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 1 | Mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 1 | Municipal securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 1 | Other securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 2 |  |  |  |  |  |
Assets |  |  |  |  |  |
Loans held for sale at fair value | 0 |  | 0 |  |  |
Loans held for investment at fair value | 0 |  | 0 |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 384,500 |  | 384,846 |  |  |
Servicing assets | 0 |  | 0 |  |  |
Other assets | 10,820 |  | 2,099 |  |  |
Total assets | 395,320 |  | 386,945 |  |  |
Liabilities: |  |  |  |  |  |
Other liabilities | 1,845 |  | 3,918 |  |  |
Total liabilities | 1,845 |  | 3,918 |  |  |
Level 2 | Senior asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 2 | Other asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 2 | U.S. agency residential mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 243,375 |  | 236,061 |  |  |
Level 2 | U.S. agency securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 70,282 |  | 73,862 |  |  |
Level 2 | Mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 53,806 |  | 55,597 |  |  |
Level 2 | Municipal securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 2,678 |  | 2,606 |  |  |
Level 2 | Other securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 14,359 |  | 16,720 |  |  |
Level 3 |  |  |  |  |  |
Assets |  |  |  |  |  |
Loans held for sale at fair value | 1,773,052 |  | 1,762,396 |  |  |
Loans held for investment at fair value | 2,085,066 |  | 473,314 |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 3,662,261 |  | 3,321,863 |  |  |
Servicing assets | 72,974 |  | 65,167 |  |  |
Other assets | 0 |  | 0 |  |  |
Total assets | 7,593,353 |  | 5,622,740 |  |  |
Liabilities: |  |  |  |  |  |
Other liabilities | 0 |  | 1,865 |  |  |
Total liabilities | 0 |  | 1,865 |  |  |
Level 3 | Senior asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 3,394,054 |  | 3,092,410 |  |  |
Level 3 | Other asset-backed securities related to Structured Program transactions |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 257,820 |  | 219,370 |  |  |
Level 3 | U.S. agency residential mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 3 | U.S. agency securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 3 | Mortgage-backed securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 3 | Municipal securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | 0 |  | 0 |  |  |
Level 3 | Other securities |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |
Total securities available for sale | $ 10,387 |  | $ 10,083 |  |  |

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