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Arrangements with Navient Corporation (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 30, 2014
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]          
Remaining balance of indemnification receivable in connection with the spin-off $ 27,000,000   $ 15,000,000    
Minimum days past due for spin off loan purchase     90 days    
Period of hardship forbearance     6 months    
Gains on sales of loans, net     $ 0 $ 2,060,000 $ 0
Interest income from third party         1,000,000
Gain (loss) resulting from loans sold         0
Write-down to fair value for loans sold to third party         5,000,000
Participated loans          
Related Party Transaction [Line Items]          
Loans sold to third party         $ 12,000,000
Discontinued Operations, Disposed of by Sale          
Related Party Transaction [Line Items]          
Split Loans portfolio sales price   $ 43,000,000      
Gains on sales of loans, net   $ 2,000,000      
Minimum          
Related Party Transaction [Line Items]          
Agreements with Navient, period of term (or less) 1 year        
Maximum          
Related Party Transaction [Line Items]          
Agreements with Navient, period of term (or less) 2 years