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Borrowings - Secured Borrowings (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Secured borrowings: |  |
Short-Term | $ 0 | $ 500,175,000
Long-Term | 2,167,979,000 | 579,101,000
Total | 2,167,979,000 | 1,079,276,000
Private Education Loan term securitizations |  |
Secured borrowings: |  |
Short-Term | 0 | 0
Long-Term | 2,167,979,000 | 579,101,000
Total | 2,167,979,000 | 579,101,000
ABCP borrowings |  |
Secured borrowings: |  |
Short-Term | 0 | 500,175,000
Long-Term | 0 | 0
Total | $ 0 | $ 500,175,000

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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