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Significant Accounting Policies - Additional Information (Details) $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 USD ($) | Jan. 01, 2020 | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Percentage of Private Education Loans related to borrowers in school, grace or deferment |  |  | 26.00% |  | 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) |  |  | 47.00% |  | 50.00%
Personal loans held for investment |  |  | $ 21,163,931 |  | $ 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% |  |
Gain on sale of Upromise subsidiary | $ 11,000 |  | $ 11,331 | $ 0 |
Accounting Standards Update 2016-13 |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Period of deferment |  | 2 |  |  |
Personal Loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Personal loans held for investment |  |  | $ 609,051 |  | $ 983,643

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