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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses | $ (1,357,075) | $ (1,165,335) | $ (1,361,723) | $ (1,143,053) | $ (441,912)
Loans held for investment, net | 19,626,868 | 20,341,283 |  |  |
Private Education Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan type | 20,303,688 | 20,716,863 |  |  |
Deferred origination costs and unamortized premium/ (discount) | 69,656 | 67,488 |  |  |
Allowance for credit losses | (1,353,631) | (1,158,977) |  |  | (374,300)
Loans held for investment, net | 19,019,713 | 19,625,374 |  |  |
Private Education Loans | Fixed-rate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan type | 11,108,079 | 9,920,547 |  |  |
Private Education Loans | Variable-rate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan type | 9,195,609 | 10,796,316 |  |  |
FFELP Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan type | 609,050 | 695,216 |  |  |
Deferred origination costs and unamortized premium/ (discount) | 1,549 | 1,815 |  |  |
Allowance for credit losses | (3,444) | (4,077) |  |  | (1,633)
Loans held for investment, net | 607,155 | 692,954 |  |  |
Credit Cards |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan type | 0 | 25,014 |  |  |
Deferred origination costs and unamortized premium/ (discount) | 0 | 222 |  |  |
Allowance for credit losses | 0 | (2,281) |  |  | $ (102)
Loans held for investment, net | $ 0 | $ 22,955 |  |  |

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