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Borrowings - Financing VIEs (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Debt Outstanding      
Short-Term $ 0 $ 0  
Long-Term 4,918,670 5,189,217  
Total 4,918,670 5,189,217  
Carrying Amount of Assets Securing Debt Outstanding      
Restricted Cash 164,708 154,417 $ 189,439
Other Assets 32,541 19,533  
Total assets 30,628,005 30,770,423  
Variable Interest Entity, Primary Beneficiary      
Debt Outstanding      
Short-Term 0 0  
Long-Term 4,225,571 4,496,338  
Total 4,225,571 4,496,338  
Carrying Amount of Assets Securing Debt Outstanding      
Loans 5,343,243 5,661,123  
Restricted Cash 164,708 154,417  
Other Assets 358,445 357,403  
Total assets 5,866,396 6,172,943  
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization      
Debt Outstanding      
Short-Term 0 0  
Long-Term 4,225,571 4,496,338  
Total 4,225,571 4,496,338  
Carrying Amount of Assets Securing Debt Outstanding      
Loans 5,343,243 5,661,123  
Restricted Cash 164,708 154,417  
Other Assets 355,949 356,967  
Total assets 5,863,900 6,172,507  
Variable Interest Entity, Primary Beneficiary | Secured Borrowing Facility      
Debt Outstanding      
Short-Term 0 0  
Long-Term 0 0  
Total 0 0  
Carrying Amount of Assets Securing Debt Outstanding      
Loans 0 0  
Restricted Cash 0 0  
Other Assets 2,496 436  
Total assets $ 2,496 $ 436