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Loans Receivable and Allowance for Loan Losses - Loans Receivable (Details) - USD ($)
$ in Thousands
May 01, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross   $ 21,590,836   $ 22,520,498      
Loan discount, net of unamortized loan premiums and deferred origination costs   (38,952)   (53,572)      
Allowance for loan losses   (62,591) $ (61,778) (60,388) $ (53,715) $ (55,294) $ (54,590)
Loans receivable   21,455,758   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   (33,535)   (29,396)      
Federally insured loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross   21,154,132   22,155,896      
Allowance for loan losses   (39,056) (40,934) (42,310) (37,263) (38,374) (38,706)
Federally insured loans | Stafford and other              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross   4,804,295   4,969,667      
Federally insured loans | Consolidation              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross   16,349,837   17,186,229      
Private education loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross   198,752   225,975      
Allowance for loan losses   (10,157) (10,587) (10,838) (11,664) (12,255) (12,629)
Consumer loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross   237,952   138,627      
Allowance for loan losses   $ (13,378) $ (10,257) $ (7,240) $ (4,788) $ (4,665) $ (3,255)
Consumer loans | Financing receivable              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans sold (par value) $ 47,700            
Gain on sale of loan $ 1,700            
Beneficial interest received as partial consideration 11.00%