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Arrangements with Navient Corporation Arrangements with Navient Corporation (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |  |  |
Non-compete period | 5 years |  |  |
Deferred taxes | $ 283,000,000 | $ 9,180,000 | $ 81,588,000 |
Remaining amount of indemnification |  | 116,000,000 |  |
Deferred tax asset discount | $ 27,000,000 | 116,000,000 |  |
Remaining balance of indemnification receivable in connection with the spin-off |  | 28,000,000 |  |
Private education loans |  | $ 14,251,675,000 | 10,596,437,000 |
Minimum days past due for spin off loan purchase |  | 90 days |  |
Period of hardship forbearance |  | 6 months |  |
Private education loans |  | $ 14,113,409,000 | 10,515,505,000 |
Interest income from third party |  | 300,000 | 600,000 | $ 5,700,000
Gain (Loss) resulting from loans sold |  | 0 | 0 | 35,800,000
Write-down to fair value for loans sold to third party |  | 6,000,000 | 7,600,000 | 53,500,000
Split Loans |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Private education loans |  | 67,000,000 |  |
Participated loans |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Loans sold to third party |  | 15,700,000 | $ 27,000,000 | $ 804,700,000
FFELP Loans |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Private education loans |  | $ 67,000,000 |  |
Minimum |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Agreements with Navient, period of term (or less) | 2 years |  |  |
Maximum |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Agreements with Navient, period of term (or less) | 3 years |  |  |

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