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Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Student loans receivable, gross $ 22,082,643 $ 22,520,498    
Loan discount, net of unamortized loan premiums and deferred origination costs (43,602) (53,572)    
Allowance for loan losses (61,778) (60,388) $ (55,294) $ (54,590)
Student loans receivable 21,946,153 22,377,142    
Non-accretable discount        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan discount, net of unamortized loan premiums and deferred origination costs (31,110) (29,396)    
Federally insured loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Student loans receivable, gross 21,680,613 22,155,896    
Allowance for loan losses (40,934) (42,310) (38,374) (38,706)
Federally insured loans | Stafford and other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Student loans receivable, gross 4,901,934 4,969,667    
Federally insured loans | Consolidation        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Student loans receivable, gross 16,778,679 17,186,229    
Private education loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Student loans receivable, gross 211,029 225,975    
Allowance for loan losses (10,587) (10,838) (12,255) (12,629)
Consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Student loans receivable, gross 191,001 138,627    
Allowance for loan losses $ (10,257) $ (7,240) $ (4,665) $ (3,255)