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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ (1,339,772) $ (1,357,075) $ (1,165,335) $ (1,361,723)
Loans held for investment, net 20,306,357 19,626,868    
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 21,025,844 20,303,688    
Deferred origination costs and unamortized premium/ (discount) 81,554 69,656    
Allowance for credit losses (1,335,105) (1,353,631)    
Loans held for investment, net 19,772,293 19,019,713    
Private Education Loans | Fixed-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 13,985,791 11,108,079    
Private Education Loans | Variable-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 7,040,053 9,195,609    
FFELP Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 537,401 609,050    
Deferred origination costs and unamortized premium/ (discount) 1,330 1,549    
Allowance for credit losses (4,667) (3,444)    
Loans held for investment, net $ 534,064 $ 607,155