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Borrowings - Financing VIEs (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Debt Outstanding      
Short-Term $ 199,379 $ 0  
Long-Term 4,989,060 5,189,217  
Total 5,188,439 5,189,217  
Carrying Amount of Assets Securing Debt Outstanding      
Restricted Cash 163,955 154,417 $ 115,192
Other Assets 41,668 19,533  
Total assets 28,925,175 30,770,423  
Variable Interest Entity, Primary Beneficiary      
Debt Outstanding      
Short-Term 0 0  
Long-Term 4,494,805 4,496,338  
Total 4,494,805 4,496,338  
Carrying Amount of Assets Securing Debt Outstanding      
Loans 5,585,834 5,661,123  
Restricted Cash 163,955 154,417  
Other Assets 379,906 357,403  
Total assets 6,129,695 6,172,943  
Variable Interest Entity, Primary Beneficiary | Private Education Loan securitization      
Debt Outstanding      
Short-Term 0 0  
Long-Term 4,494,805 4,496,338  
Total 4,494,805 4,496,338  
Carrying Amount of Assets Securing Debt Outstanding      
Loans 5,585,834 5,661,123  
Restricted Cash 163,955 154,417  
Other Assets 378,123 356,967  
Total assets 6,127,912 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 1,783 436  
Total assets $ 1,783 $ 436