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Loans Held for Investment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percent of private loans indexed to LIBOR | 35.00% |  | 35.00% |  | 45.00% |  |  |
Tier 1 of government guarantee (at least) | 97.00% |  | 97.00% |  |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  |  |  |  | 100.00%
Gain on sales of loans, net | $ (5) | $ 74,978 | $ 124,740 | $ 324,856 |  |  |  |
Estimated weighted average life of student loans |  |  | 5 years |  | 5 years |  |  |
Private Education Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gain on sales of loans, net |  |  | $ 128,000 | 325,000 |  |  |  |
Proceeds from sale of loans receivable |  |  | 2,100,000 | 3,290,000 |  |  |  |
Net proceeds from sales of loans held for investment, principal |  |  | 1,960,000 | 3,080,000 |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest |  |  | $ 144,000 | $ 213,000 |  |  |  |

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