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Borrowings - Secured Financing (Details) - USD ($)
 1 Months Ended
May 31, 2024
Aug. 31, 2023
Mar. 31, 2023
Sep. 30, 2024
Aug. 31, 2024
Dec. 31, 2023
Securities Financing Transaction [Line Items]            
Total Issued       $ 1,536,000,000   $ 1,147,000,000
Total loans and accrued interest amount securitized at inception       1,678,289,000   $ 1,292,507,000
2023-A            
Securities Financing Transaction [Line Items]            
Total Issued     $ 579,000,000      
Weighted Average Cost of Funds (as a percent)     1.53%      
Weighted Average Life (in years)     5 years 21 days      
2023-C            
Securities Financing Transaction [Line Items]            
Total Issued   $ 568,000,000        
Weighted Average Cost of Funds (as a percent)   1.69%        
Weighted Average Life (in years)   4 years 11 months 4 days        
2024-C            
Securities Financing Transaction [Line Items]            
Total Issued $ 668,000,000          
Weighted Average Cost of Funds (as a percent) 1.19%          
Weighted Average Life (in years) 5 years 4 months 9 days          
Principal amount of collateral       656,000,000    
Capitalized interest       60,000,000    
2024-E            
Securities Financing Transaction [Line Items]            
Total Issued         $ 868,000,000  
Weighted Average Cost of Funds (as a percent) 1.42%          
Weighted Average Life (in years) 5 years 2 months 1 day          
Principal amount of collateral       855,000,000    
Capitalized interest       78,000,000    
Private Education Loans Securitized In 2023            
Securities Financing Transaction [Line Items]            
Loans       1,110,000,000    
Principal amount of collateral       1,020,000,000.00    
Capitalized interest       85,000,000    
Private Education Loans Securitized In 2024            
Securities Financing Transaction [Line Items]            
Loans       1,650,000,000    
Principal amount of collateral       1,510,000,000    
Capitalized interest       $ 138,000,000