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Arrangements with Navient Corporation (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
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 | $ 9,245,259,000 |  | $ 9,245,259,000 |  | $ 8,246,647,000
Interest income from related party | 118,000 | $ 1,770,000 | 285,000 | $ 25,797,000 |
Gains on loans to related party | 0 | 1,928,000 | 0 | 35,816,000 |
Write-down to fair value for loans sold to related party | 1,521,000 | 17,467,000 | 3,702,000 | 46,430,000 |
Split Loans |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Split loans, net | 101,200,000 |  | 101,200,000 |  |
Participated loans |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans sold to related party | $ 5,898,000 | $ 94,179,000 | $ 14,612,000 | $ 765,998,000 |

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