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Arrangements with Navient Corporation (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |
Minimum days past due that company may required spin-off company to purchase loans |  |  | 90 days |  |
Period of hardship forbearance |  |  | 6 months |  |
Split loans, net | $ 13,725,959,000 |  | $ 13,725,959,000 |  | $ 10,515,505,000
Interest income from related party | 60,000 | $ 200,000 | 300,000 | $ 400,000 |
Gains on loans to related party | 0 | 0 | 0 | 0 |
Write-down to fair value for loans sold to related party | 1,400,000 | 1,900,000 | 5,000,000 | 5,600,000 |
Split Loans |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Split loans, net | 71,000,000 |  | 71,000,000 |  |
Participated loans |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans sold to related party | $ 3,600,000 | $ 6,600,000 | $ 13,100,000 | $ 21,100,000 |

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