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Arrangements with Navient Corporation (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2014 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Remaining balance of indemnification receivable in connection with the spin-off | $ 27,000,000 |  | $ 15,000,000 |  |
Minimum days past due for spin off loan purchase |  |  | 90 days |  |
Period of hardship forbearance |  |  | 6 months |  |
Gains on sales of loans, net |  |  | $ 0 | $ 2,060,000 | $ 0
Interest income from third party |  |  |  |  | 1,000,000
Gain (loss) resulting from loans sold |  |  |  |  | 0
Write-down to fair value for loans sold to third party |  |  |  |  | 5,000,000
Participated loans |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans sold to third party |  |  |  |  | $ 12,000,000
Discontinued Operations, Disposed of by Sale |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Split Loans portfolio sales price |  | $ 43,000,000 |  |  |
Gains on sales of loans, net |  | $ 2,000,000 |  |  |
Minimum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Agreements with Navient, period of term (or less) | 1 year |  |  |  |
Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Agreements with Navient, period of term (or less) | 2 years |  |  |  |

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