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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-Term | $ 199,583 | $ 0
Long-Term | 5,219,748 | 5,189,217
Total | 5,419,331 | 5,189,217
Unsecured borrowings |  |
Debt Instrument [Line Items] |  |
Short-Term | 199,583 | 0
Long-Term | 494,585 | 692,879
Total | 694,168 | 692,879
Secured borrowings |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 4,725,163 | 4,496,338
Total | 4,725,163 | 4,496,338
Secured borrowings | Private Education Loan securitization |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 4,725,163 | 4,496,338
Total | 4,725,163 | 4,496,338
Secured borrowings | Private Education Loan securitization | Fixed-rate |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 3,698,662 | 3,261,233
Total | 3,698,662 | 3,261,233
Secured borrowings | Private Education Loan securitization | Variable-rate |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 1,026,501 | 1,235,105
Total | 1,026,501 | 1,235,105
Secured borrowings | Secured Borrowing Facility |  |
Debt Instrument [Line Items] |  |
Short-Term | 0 | 0
Long-Term | 0 | 0
Total | $ 0 | $ 0

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