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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ (1,416,048) | $ (1,364,716) | $ (1,357,075) | $ (1,194,238) | $ (1,081,066) | $ (1,165,335)
Private Education Loans, net | 20,899,181 |  | 19,626,868 |  |  |
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 21,680,867 |  | 20,303,688 |  |  |
Deferred origination costs and unamortized premium/(discount) | 78,673 |  | 69,656 |  |  |
Allowance for credit losses | (1,411,232) |  | (1,353,631) |  |  |
Private Education Loans, net | 20,348,308 |  | 19,019,713 |  |  |
Private Education Loans | Fixed-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 14,000,110 |  | 11,108,079 |  |  |
Private Education Loans | Variable-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 7,680,757 |  | 9,195,609 |  |  |
FFELP Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 554,309 |  | 609,050 |  |  |
Deferred origination costs and unamortized premium/(discount) | 1,380 |  | 1,549 |  |  |
Allowance for credit losses | (4,816) |  | (3,444) |  |  |
Private Education Loans, net | $ 550,873 |  | $ 607,155 |  |  |

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