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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ (1,081,066) | $ (1,227,362) | $ (1,165,335) | $ (1,160,244) | $ (1,179,021) | $ (1,361,723)
Loans held for investment, net | 19,201,328 |  | 20,341,283 |  |  |
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 19,519,185 |  | 20,716,863 |  |  |
Deferred origination costs and unamortized premium/(discount) | 66,809 |  | 67,488 |  |  |
Allowance for credit losses | (1,074,744) |  | (1,158,977) |  |  |
Loans held for investment, net | 18,511,250 |  | 19,625,374 |  |  |
Private Education Loans | Fixed-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 9,748,824 |  | 9,920,547 |  |  |
Private Education Loans | Variable-rate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 9,770,361 |  | 10,796,316 |  |  |
FFELP Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 665,666 |  | 695,216 |  |  |
Deferred origination costs and unamortized premium/(discount) | 1,715 |  | 1,815 |  |  |
Allowance for credit losses | (3,929) |  | (4,077) |  |  |
Loans held for investment, net | 663,452 |  | 692,954 |  |  |
Credit Cards |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loan type | 28,900 |  | 25,014 |  |  |
Deferred origination costs and unamortized premium/(discount) | 119 |  | 222 |  |  |
Allowance for credit losses | (2,393) |  | (2,281) |  |  |
Loans held for investment, net | $ 26,626 |  | $ 22,955 |  |  |

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