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Loans Held for Investment - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Receivables [Abstract] |  |  |  |  |
Percent of private loans indexed to LIBOR | 22.00% | 23.00% |  |  |
Tier 1 of government guarantee (at least) | 97.00% |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  | 100.00%
Estimated weighted average life of student loans | 5 years 7 months 6 days | 5 years 7 months 6 days |  |  |

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