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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ (1,179,021) | $ (1,361,723) | $ (1,673,324) | $ (441,912)
Loans held for investment, net | 20,368,287 | 19,183,143 |  |
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 20,741,840 | 19,729,337 |  |
Deferred origination costs and unamortized premium/(discount) | 64,468 | 63,475 |  |
Allowance for credit losses | (1,173,375) | (1,355,844) |  |
Loans held for investment, net | 19,632,933 | 18,436,968 |  |
Private Education Loans | Fixed-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 9,504,760 | 8,950,216 |  |
Private Education Loans | Variable-rate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 11,237,080 | 10,779,121 |  |
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 727,664 | 737,593 |  |
Deferred origination costs and unamortized premium/(discount) | 1,954 | 1,993 |  |
Allowance for credit losses | (4,318) | (4,378) |  |
Loans held for investment, net | 725,300 | 735,208 |  |
Credit Cards |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan type | 11,309 | 12,238 |  |
Deferred origination costs and unamortized premium/(discount) | 73 | 230 |  |
Allowance for credit losses | (1,328) | (1,501) |  |
Loans held for investment, net | $ 10,054 | $ 10,967 |  |

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