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Subsequent Events (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 11, 2024 | Mar. 31, 2024 | Apr. 09, 2024 | Dec. 31, 2023
Subsequent Event [Line Items] |  |  |  |
Trading investments |  | $ 58,166 |  | $ 54,481
Vertical risk retention interest |  | 5.00% |  |
Subsequent Event | SMB Private Education Loan Trust 2024-B |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Vertical risk retention interest | 5.00% |  |  |
Private Education Loans | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Trading investments |  |  | $ 69,000 |
Private Education Loans | Subsequent Event | SMB Private Education Loan Trust 2024-B |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Private education loans sold | $ 191,000 |  |  |
Additional proceeds from sale | 10,000 |  |  |
Gain on sale | $ 1,000 |  |  |

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