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Loans Held for Investment - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percent of private loans indexed to LIBOR | 54.00% |  |  | 54.00% |  | 58.00% |  |  |
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 from sale | $ (4) | $ 239,000 | $ 0 | $ 238,562 | $ 0 |  |  |  |
Proceeds from sale of loans receivable |  | 3,100,000 |  |  |  |  |  |  |
Net proceeds from sales of loans held for investment, principal |  | 2,900,000 |  |  |  |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest |  | 199,000 |  |  |  |  |  |  |
Net proceeds from sales of loans held for investment, accrued interest |  | $ 12,000 |  |  |  |  |  |  |
Net proceeds from sales of personal loans, principal | 697,000 |  |  |  |  |  |  |  |
Net proceeds from personal loans, accrued interest | 7,000 |  |  |  |  |  |  |  |
Loan sale reduction to provision | $ (42,916) |  |  | $ (204,709) |  |  |  |  |
Estimated weighted average life of student loans |  |  |  | 5 years 4 months 24 days |  | 5 years 4 months 24 days |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  | 4.00% |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty, period |  |  |  | 2 years |  |  |  |  |
Loans currently in repayment status that were subject to interest rate reductions | 8.80% |  |  | 8.80% |  | 7.20% |  |  |
Personal Loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loan sale reduction to provision | $ (42,916) |  |  | $ (42,916) |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 2.00% |  |  | 2.00% |  |  |  |  |
Increase to life of loan defaults |  |  |  | 4.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  | 4.00% |  |  |  |  |
Increase to life of loan defaults |  |  |  | 14.00% |  |  |  |  |

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