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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ (1,215,407) | $ (1,160,244) | $ (1,361,723) | $ (1,734,559) | $ (1,929,323) | $ (441,912)
Loans held for investment, net | 21,281,527 |  | 19,183,143 |  |  |
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 21,702,837 |  | 19,729,337 |  |  |
Deferred origination costs and unamortized premium/(discount) | 68,584 |  | 63,475 |  |  |
Allowance for credit losses | (1,209,460) |  | (1,355,844) |  |  |
Loans held for investment, net | 20,561,961 |  | 18,436,968 |  |  |
Private Education Loans | Fixed-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 10,306,885 |  | 8,950,216 |  |  |
Private Education Loans | Variable-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 11,395,952 |  | 10,779,121 |  |  |
FFELP Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 705,691 |  | 737,593 |  |  |
Deferred origination costs and unamortized premium/(discount) | 1,870 |  | 1,993 |  |  |
Allowance for credit losses | (4,206) |  | (4,378) |  |  |
Loans held for investment, net | 703,355 |  | 735,208 |  |  |
Credit Cards |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 17,766 |  | 12,238 |  |  |
Deferred origination costs and unamortized premium/(discount) | 186 |  | 230 |  |  |
Allowance for credit losses | (1,741) |  | (1,501) |  |  |
Loans held for investment, net | $ 16,211 |  | $ 10,967 |  |  |

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