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Loans Held for Investment - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) payment | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) payment repaymentAlternative numberOfExtensions rateReduction | Sep. 30, 2020 USD ($) | Dec. 31, 2020 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Percent of private loans indexed to LIBOR | 53.00% |  |  |  | 53.00% |  | 55.00% |  |  |
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 | $ | $ (10) |  |  | $ (4) | $ 402,780 | $ 238,562 |  |  |  |
Proceeds from sale of loans receivable | $ |  |  |  |  | 3,190,000 |  |  |  |  |
Net proceeds from sales of loans held for investment, principal | $ |  | $ 25,000 | $ 2,970,000 |  | 2,990,000 |  |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest | $ |  | $ 2,000 | $ 193,000 |  | $ 195,000 |  |  |  |  |
Estimated weighted average life of student loans |  |  |  |  | 4 years 8 months 12 days |  | 5 years 4 months 24 days |  |  |
Maximum amount of forbearance granted |  |  |  |  | 12 months |  |  |  |  |
Number of payments due before granting forbearance | payment | 1 |  |  |  | 1 |  |  |  |  |
Increment in which disaster forbearance is granted |  |  |  |  | 3 months |  |  |  |  |
Period of positive payment performance required by a borrower between successive grants of forbearance |  |  |  |  | 6 months |  |  |  |  |
Number of payments required by a borrower between successive grants of forbearance | payment |  |  |  |  | 6 |  |  |  |  |
Period excluded from disallowance of forbearance following grace period |  |  |  |  | 6 months |  |  |  |  |
Number of times delinquent borrowers can participate in certain short-term interest-only payment alternatives in a 12 month period | repaymentAlternative |  |  |  |  | 2 |  |  |  |  |
Period that delinquent borrowers can participate in certain short-term interest-only payment alternatives, option one |  |  |  |  | 12 months |  |  |  |  |
Number of times delinquent borrowers can participate in certain short-term interest-only payment alternatives in a five-year period | repaymentAlternative |  |  |  |  | 1 |  |  |  |  |
Period that delinquent borrowers can participate in certain short-term interest-only payment alternatives, option two |  |  |  |  | 5 years |  |  |  |  |
Period of positive payment performance required by a borrower between successive grants of forbearance, updated credit administration practices |  |  |  |  | 12 months |  |  |  |  |
Number of payments required by a borrower between successive grants of forbearance, updated credit administration practices | payment |  |  |  |  | 12 |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  | 4.00% |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty, period |  |  |  |  | 2 years |  |  |  |  |
Number of available extensions of final maturity date of loan under loan modification program, borrowers facing financial difficulty | numberOfExtensions |  |  |  |  | 1 |  |  |  |  |
Number of rate reductions available under loan modification program, borrowers facing financial difficulty | rateReduction |  |  |  |  | 2 |  |  |  |  |
Number of consecutive monthly payments required to qualify for rate reduction, borrowers facing financial difficulty | payment |  |  |  |  | 3 |  |  |  |  |
Period of positive payment performance required by a borrower between successive grants of forbearance, borrowers facing financial difficulty |  |  |  |  | 6 months |  |  |  |  |
Period of positive payment performance required by a borrower between successive grants of forbearance, borrowers facing financial difficulty |  |  |  |  | 12 months |  |  |  |  |
Loans currently in repayment status that were subject to interest rate reductions | 9.20% |  |  |  | 9.20% |  | 7.80% |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Increments in which forbearance is granted |  |  |  |  | 1 month |  |  |  |  |
Loans expected to have accelerated default rates and increases to loan life |  |  |  |  | 10.10% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |
Increments in which forbearance is granted |  |  |  |  | 2 months |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  | 4.00% |  |  |  |  |
Loans expected to have accelerated default rates and increases to loan life |  |  |  |  | 16.60% |  |  |  |  |

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