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Borrowings - Financing VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Debt Outstanding      
Short-Term $ 0 $ 0  
Long-Term 6,838,995 6,440,345  
Total 6,838,995 6,440,345  
Carrying Amount of Net Assets Securing Debt Outstanding      
Restricted Cash 193,143 173,894 $ 170,984
Other Assets, Net 36,838 36,846  
Total assets 29,605,422 30,072,110  
Variable Interest Entity, Primary Beneficiary      
Debt Outstanding      
Short-Term 0 0  
Long-Term 5,848,039 5,444,925  
Total 5,848,039 5,444,925  
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 7,317,527 6,786,390  
Restricted Cash 193,141 173,892  
Other Assets, Net 532,959 418,803  
Total assets 8,043,627 7,379,085  
Variable Interest Entity, Primary Beneficiary | Private Education Loan term securitizations      
Debt Outstanding      
Short-Term 0 0  
Long-Term 5,148,039 5,444,925  
Total 5,148,039 5,444,925  
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 6,483,030 6,786,390  
Restricted Cash 163,186 173,892  
Other Assets, Net 450,322 418,705  
Total assets 7,096,538 7,378,987  
Variable Interest Entity, Primary Beneficiary | Secured Borrowing Facility      
Debt Outstanding      
Short-Term 0 0  
Long-Term 700,000 0  
Total 700,000 0  
Carrying Amount of Net Assets Securing Debt Outstanding      
Loans 834,497 0  
Restricted Cash 29,955 0  
Other Assets, Net 82,637 98  
Total assets $ 947,089 $ 98