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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for loan losses $ (1,673,324) $ (441,912) $ (441,912) $ (358,325) $ (341,121)
Loans held for investment, net 21,695,851   24,667,792    
Private Education Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private education loans 21,626,747   23,189,591    
Deferred origination costs and unamortized premium/(discount) 65,267   81,224    
Allowance for loan losses (1,515,781) (374,300) (374,300)    
Loans held for investment, net 20,176,233   22,896,515    
Private Education Loans | Fixed-rate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private education loans 9,813,075   9,830,301    
Private Education Loans | Variable-rate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private education loans 11,813,672   13,359,290    
FFELP Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private education loans 766,954   783,306    
Deferred origination costs and unamortized premium/(discount) 2,113   2,143    
Allowance for loan losses (4,296) (1,633) (1,633)    
Loans held for investment, net 764,771   783,816    
Personal Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private education loans 899,704   1,049,007    
Deferred origination costs and unamortized premium/(discount) 413   513    
Allowance for loan losses (152,673) (65,877) (65,877)    
Loans held for investment, net 747,444   983,643    
Credit Cards          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private education loans 7,234   3,884    
Deferred origination costs and unamortized premium/(discount) 743   36    
Allowance for loan losses (574) $ (102) (102)    
Loans held for investment, net $ 7,403   $ 3,818