v3.26.3
Borrowings - Financing VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Debt Outstanding      
Short-Term $ 898,729 $ 498,415  
Long-Term 5,535,923 5,362,494  
Total 6,434,652 5,860,909  
Carrying Amount of Net Assets Securing Debt Outstanding      
Restricted Cash 273,771 177,263 $ 193,143
Other Assets, Net 59,208 47,315  
Total assets 29,840,996 29,746,295  
Variable Interest Entity, Primary Beneficiary      
Debt Outstanding      
Short-Term 898,729 0  
Long-Term 4,547,457 4,869,079  
Total 5,446,186 4,869,079  
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 6,880,271 6,249,064  
Restricted Cash 215,334 177,260  
Other Assets, Net 419,781 378,997  
Total assets 7,515,386 6,805,321  
Variable Interest Entity, Primary Beneficiary | Private Education Loan term securitizations      
Debt Outstanding      
Short-Term 0 0  
Long-Term 4,547,457 4,869,079  
Total 4,547,457 4,869,079  
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 5,908,168 6,249,064  
Restricted Cash 166,348 177,260  
Other Assets, Net 394,125 377,673  
Total assets 6,468,641 6,803,997  
Variable Interest Entity, Primary Beneficiary | Secured Borrowing Facility      
Debt Outstanding      
Short-Term 0 0  
Long-Term 0 0  
Total 0 0  
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 0 0  
Restricted Cash 0 0  
Other Assets, Net 1,747 1,324  
Total assets 1,747 $ 1,324  
Variable Interest Entity, Primary Beneficiary | Secured Warehouse Facility      
Debt Outstanding      
Short-Term 898,729    
Long-Term 0    
Total 898,729    
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 972,103    
Restricted Cash 48,986    
Other Assets, Net 23,909    
Total assets $ 1,044,998