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Borrowings - Summary of Exposure Related To Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Estimated Fair Value | $ 1,650,656 |  | $ 1,933,226 |  |  |
Total Exposure | 52,541 | $ 23,890 | 84,568 | $ 49,479 | $ 32,034 | $ 112,962
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Estimated Fair Value | 520,987 |  | 571,795 |  |  |
Equity Interests | 47,154 |  | 53,262 |  |  |
Total Exposure | $ 568,141 |  | $ 625,057 |  |  |

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