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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ (1,350,058) | $ (1,339,772) | $ (1,479,306) | $ (1,357,075)
Private Education Loans, net | 20,200,789 | 20,306,357 |  |
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 20,952,346 | 21,025,844 |  |
Deferred origination costs and unamortized premium/(discount) | 80,868 | 81,554 |  |
Allowance for credit losses | (1,345,431) | (1,335,105) |  |
Private Education Loans, net | 19,687,783 | 19,772,293 |  |
Private Education Loans | Fixed-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 14,788,341 | 13,985,791 |  |
Private Education Loans | Variable-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 6,164,005 | 7,040,053 |  |
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 516,363 | 537,401 |  |
Deferred origination costs and unamortized premium/(discount) | 1,270 | 1,330 |  |
Allowance for credit losses | (4,627) | (4,667) |  |
Private Education Loans, net | $ 513,006 | $ 534,064 |  |

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