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Borrowings - Summary of Exposure Related to Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Estimated Fair Value | $ 2,411,622 | $ 2,342,089 |  |
Liability for unfunded commitments | 112,962 | 124,924 | $ 72,713 | $ 110,044
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations: |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Estimated Fair Value | 423,327 | 329,188 |  |
Equity Interests | 54,481 | 50,786 |  |
Liability for unfunded commitments | $ 477,808 | $ 379,974 |  |

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