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Borrowings - Secured Financing (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued |  |  |  | $ 1,147,000,000
Total loans and accrued interest amount securitized at inception |  |  |  | $ 1,292,507,000
2023-A |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued |  | $ 579,000,000 |  |
Weighted Average Life (in years) |  | 5 years 21 days |  |
2023-A | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Weighted Average Cost of Funds (as a percent) |  | 1.53% |  |
2023-C |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total Issued | $ 568,000,000 |  |  |
Weighted Average Life (in years) | 4 years 11 months 4 days |  |  |
2023-C | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Weighted Average Cost of Funds (as a percent) | 1.69% |  |  |
Private Education Loans Securitized In 2023 |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Loans |  |  | $ 1,170,000,000 |
Principal amount of collateral |  |  | 1,090,000,000.00 |
Capitalized interest |  |  | $ 84,000,000 |

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