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Borrowings - Secured Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 0 | $ 0
Long-Term | 5,930,990 | 5,189,217
Total | 5,930,990 | 5,189,217
ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Unsecured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 986,138 | 692,879
Total | 986,138 | 692,879
Secured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,944,852 | 4,496,338
Total | 4,944,852 | 4,496,338
Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,944,852 | 4,496,338
Total | 4,944,852 | 4,496,338
Secured borrowings | ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 0 | 0
Total | 0 | 0
Secured borrowings | Fixed Income Interest Rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 3,897,996 | 3,261,233
Total | 3,897,996 | 3,261,233
Secured borrowings | Variable Income Interest Rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 1,046,856 | 1,235,105
Total | $ 1,046,856 | $ 1,235,105

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