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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 0 | $ 0
Long-Term | 5,235,114 | 5,930,990
Total | 5,235,114 | 5,930,990
Unsecured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 988,986 | 986,138
Total | 988,986 | 986,138
Secured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,246,128 | 4,944,852
Total | 4,246,128 | 4,944,852
Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,246,128 | 4,944,852
Total | 4,246,128 | 4,944,852
Secured borrowings | Secured Borrowing Facility |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 0 | 0
Total | 0 | 0
Secured borrowings | Fixed-rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 3,462,363 | 3,897,996
Total | 3,462,363 | 3,897,996
Secured borrowings | Variable-rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 783,765 | 1,046,856
Total | $ 783,765 | $ 1,046,856

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