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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