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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Percentage of Private Education Loans related to borrowers in school, grace or deferment | 27.00% | 25.00%
Interest rate offered to borrowers facing financial difficulty | 4.00% |
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) | 48.00% | 50.00%
Personal loans held for investment | $ 21,695,851 | $ 24,667,792
Percentage reimbursement on all qualifying default claims period two (as a percentage) | 97.00% |
Percentage reimbursement on all qualifying default claims period one (as a percentage) | 98.00% |
Percentage reimbursement on all qualifying default claims period three (as a percentage) | 100.00% |
Variable rate | 105.00% |
Personal Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Personal loans held for investment | $ 747,444 | $ 983,643

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