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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ (1,435,920) | $ (1,339,772) | $ (1,357,075) | $ (1,165,335)
Loans held for investment, net | 20,902,158 | 20,306,357 |  |
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 22,235,008 | 21,025,844 |  |
Deferred origination costs and unamortized premium/ (discount) | 103,070 | 81,554 |  |
Allowance for loan losses | (1,435,920) | (1,335,105) |  |
Loans held for investment, net | 20,902,158 | 19,772,293 |  |
Private Education Loans | Fixed-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 17,093,382 | 13,985,791 |  |
Private Education Loans | Variable-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 5,141,626 | 7,040,053 |  |
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 0 | 537,401 |  |
Deferred origination costs and unamortized premium/ (discount) | 0 | 1,330 |  |
Allowance for loan losses | 0 | (4,667) |  |
Loans held for investment, net | $ 0 | $ 534,064 |  |

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