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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for credit losses $ (1,479,306) $ (1,357,075) $ (1,227,362) $ (1,165,335)
Loans held for investment, net 21,087,563 19,626,868    
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 21,898,003 20,303,688    
Deferred origination costs and unamortized premium/(discount) 75,051 69,656    
Allowance for credit losses (1,475,379) (1,353,631)    
Loans held for investment, net 20,497,675 19,019,713    
Private Education Loans | Fixed-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 12,726,875 11,108,079    
Private Education Loans | Variable-rate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 9,171,128 9,195,609    
FFELP Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan type 592,318 609,050    
Deferred origination costs and unamortized premium/(discount) 1,497 1,549    
Allowance for credit losses (3,927) (3,444)    
Loans held for investment, net $ 589,888 $ 607,155