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Borrowings - Unconsolidated VIEs Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2024 | Apr. 11, 2024 | Apr. 09, 2024 | Nov. 07, 2023 | May 24, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |
Vertical risk retention interest |  |  |  |  |  | 5.00% | 5.00%
2024-R1 ABS transaction | Private Education Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans Transferred to the Trust by Third-Party Seller |  |  | $ 68,896 |  |  |  |
Additional Loans the Bank Transferred to the Trust |  |  | 0 |  |  |  |
Gain on Sale for Additional Loans Transferred by Bank |  |  | $ 0 |  |  |  |
2024-B ABS transaction | Private Education Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans Transferred to the Trust by Third-Party Seller |  | $ 191,445 |  |  |  |  |
Additional Loans the Bank Transferred to the Trust |  | 10,132 |  |  |  |  |
Gain on Sale for Additional Loans Transferred by Bank |  | $ 35 |  |  |  |  |
2024-D ABS transaction | Private Education Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans Transferred to the Trust by Third-Party Seller | $ 1,494,953 |  |  |  |  |  |
Additional Loans the Bank Transferred to the Trust | 78,782 |  |  |  |  |  |
Gain on Sale for Additional Loans Transferred by Bank | $ 6,051 |  |  |  |  |  |
2023-B ABS transaction | Private Education Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans Transferred to the Trust by Third-Party Seller |  |  |  |  | $ 1,988,277 |  |
Additional Loans the Bank Transferred to the Trust |  |  |  |  | 104,743 |  |
Gain on Sale for Additional Loans Transferred by Bank |  |  |  |  | $ 5,391 |  |
2023-D ABS transaction | Private Education Loans |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loans Transferred to the Trust by Third-Party Seller |  |  |  | $ 995,184 |  |  |
Additional Loans the Bank Transferred to the Trust |  |  |  | 52,572 |  |  |
Gain on Sale for Additional Loans Transferred by Bank |  |  |  | $ 1,570 |  |  |

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