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Significant Accounting Policies - Troubled Debt Restructurings (Details) - USD ($) | 12 Months Ended |
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Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |
Percentage of Private Education Loans related to borrowers in school, grace or deferment | 24.00% | 24.00%
Interest rate offered to borrowers facing financial difficulty | 4.00% |
Interest rate offered to borrowers facing financial difficulty, period | 2 years |
Period of forbearance period to be classified as TDR | 3 months |
Period of forbearance | 24 months |
Period after grace period for forbearance allowance for loans | 9 months |
Forbearance period after grace period for loans | 6 months |
Percentage of loans granted forbearance (as a percentage) | 47.00% | 47.00%
Monthly payment that is smaller than the interest accrued on the loan in that month | $ 25 |

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