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Borrowings - Company Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 0 | $ 0
Long-Term | 6,440,345 | 5,227,512
Total | 6,440,345 | 5,227,512
Unsecured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 995,420 | 992,200
Total | 995,420 | 992,200
Secured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 5,444,925 | 4,235,312
Total | 5,444,925 | 4,235,312
Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 5,444,925 | 4,235,312
Total | 5,444,925 | 4,235,312
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 | 4,617,743 | 3,585,254
Total | 4,617,743 | 3,585,254
Secured borrowings | Variable-rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 827,182 | 650,058
Total | $ 827,182 | $ 650,058

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