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Borrowings - Secured Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 0 | $ 289,230
Long-Term | 5,189,217 | 4,354,037
Total | 5,189,217 | 4,643,267
ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 289,230
Unsecured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 692,879 | 198,159
Total | 692,879 | 198,159
Secured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 289,230
Long-Term | 4,496,338 | 4,155,878
Total | 4,496,338 | 4,445,108
Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,496,338 | 4,155,878
Total | 4,496,338 | 4,155,878
Secured borrowings | ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 289,230
Long-Term | 0 | 0
Total | 0 | 289,230
Secured borrowings | Fixed Income Interest Rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 3,261,233 | 2,629,902
Total | 3,261,233 | 2,629,902
Secured borrowings | Variable Income Interest Rate | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 1,235,105 | 1,525,976
Total | $ 1,235,105 | $ 1,525,976

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