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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ (1,361,723) $ (441,912) $ (341,121) $ (251,475)
Loans held for investment, net 19,183,143 24,667,792    
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 19,729,337 23,189,591    
Deferred origination costs and unamortized premium/ (discount) 63,475 81,224    
Allowance for loan losses (1,355,844) (374,300)    
Loans held for investment, net 18,436,968 22,896,515    
FFELP Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 737,593 783,306    
Deferred origination costs and unamortized premium/ (discount) 1,993 2,143    
Allowance for loan losses (4,378) (1,633)    
Loans held for investment, net 735,208 783,816    
Personal Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 0 1,049,007    
Deferred origination costs and unamortized premium/ (discount) 0 513    
Allowance for loan losses 0 (65,877)    
Loans held for investment, net 0 983,643    
Credit Cards        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 12,238 3,884    
Deferred origination costs and unamortized premium/ (discount) 230 36    
Allowance for loan losses (1,501) (102)    
Loans held for investment, net 10,967 3,818    
Private Education Loan, Extended Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses (1,000,000)      
Fixed Income Interest Rate | Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 8,950,216 9,830,301    
Variable Income Interest Rate | Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans $ 10,779,121 $ 13,359,290