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Arrangements with Navient Corporation (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 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 $ 10,766,511,000   $ 10,766,511,000   $ 8,246,647,000
Interest income from related party 153,000 $ 542,000 438,000 $ 26,339,000  
Gains on loans to related party 0 0 0 35,848,000  
Write-down to fair value for loans sold to related party 1,871,000 4,571,000 5,573,000 51,001,000  
Split Loans          
Related Party Transaction [Line Items]          
Split loans, net 96,100,000   96,100,000    
Participated loans          
Related Party Transaction [Line Items]          
Loans sold to related party $ 6,552,000 $ 28,871,000 $ 21,109,000 $ 794,870,000