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Borrowings - Secured Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 0 | $ 0
Long-Term | 4,284,304 | 3,275,270
Total | 4,284,304 | 3,275,270
ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Unsecured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 197,348 | 196,539
Total | 197,348 | 196,539
Secured borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,086,956 | 3,078,731
Total | 4,086,956 | 3,078,731
Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 4,086,956 | 3,078,731
Total | 4,086,956 | 3,078,731
Secured borrowings | ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 0 | 0
Total | 0 | 0
Fixed Income Interest Rate | Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 2,284,347 | 1,565,760
Total | 2,284,347 | 1,565,760
Variable Income Interest Rate | Secured borrowings | Private Education Loan term securitizations: |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 1,802,609 | 1,512,971
Total | $ 1,802,609 | $ 1,512,971

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