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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ (414,406) $ (383,997) $ (341,121) $ (328,974) $ (295,277) $ (251,475)
Loans held for investment, net 24,716,664   22,270,919      
Private Education Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans, gross 23,120,169   20,504,465      
Deferred origination costs and unamortized premium/(discount) 78,103   68,321      
Allowance for loan losses (342,544)   (277,943)      
Loans held for investment, net 22,855,728   20,294,843      
Private Education Loans | Fixed-rate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans, gross 9,551,114   6,759,019      
Private Education Loans | Variable-rate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans, gross 13,569,055   13,745,446      
FFELP Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans, gross 798,168   846,487      
Deferred origination costs and unamortized premium/(discount) 2,203   2,379      
Allowance for loan losses (1,689)   (977)      
Loans held for investment, net 798,682   847,889      
Personal Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans, gross 1,131,833   1,190,091      
Deferred origination costs and unamortized premium/(discount) 594   297      
Allowance for loan losses (70,173)   (62,201)      
Loans held for investment, net $ 1,062,254   $ 1,128,187