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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ (441,912) $ (341,121) $ (251,475) $ (184,701)
Loans held for investment, net 24,667,792 22,270,919    
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 23,189,591 20,504,465    
Deferred origination costs and unamortized premium/ (discount) 81,224 68,321    
Allowance for loan losses (374,300) (277,943)    
Loans held for investment, net 22,896,515 20,294,843    
FFELP Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 783,306 846,487    
Deferred origination costs and unamortized premium/ (discount) 2,143 2,379    
Allowance for loan losses (1,633) (977)    
Loans held for investment, net 783,816 847,889    
Personal Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 1,049,007 1,190,091    
Deferred origination costs and unamortized premium/ (discount) 513 297    
Allowance for loan losses (65,877) (62,201)    
Loans held for investment, net 983,643 1,128,187    
Credit Cards        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 3,884 0    
Deferred origination costs and unamortized premium/ (discount) 36 0    
Allowance for loan losses (102) 0    
Loans held for investment, net 3,818 0    
Fixed Income Interest Rate | Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans 9,830,301 6,759,019    
Variable Income Interest Rate | Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Private Education Loans $ 13,359,290 $ 13,745,446