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Borrowings - Summary of Exposure Related to Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Estimated Fair Value | $ 1,933,226 | $ 2,411,622 |  |
Liability for unfunded commitments | 84,568 | 112,962 | $ 124,924 | $ 72,713
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations: |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Estimated Fair Value | 571,795 | 423,327 |  |
Equity Interests | 53,262 | 54,481 |  |
Liability for unfunded commitments | $ 625,057 | $ 477,808 |  |

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