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Loans Held for Investment - Student Loan Portfolio by Program (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Receivables [Abstract] |  |
Private Education Loans | $ 12,111,870 | $ 10,596,437
Deferred origination costs | 31,772 | 27,884
Allowance for loan losses | (122,620) | (108,816)
Total Private Education Loans, net | 12,021,022 | 10,515,505
FFELP Loans | 1,088,026 | 1,115,663
Unamortized acquisition costs, net | 3,006 | 3,114
Allowance for loan losses | (3,629) | (3,691)
Total FFELP Loans, net | 1,087,403 | 1,115,086
Loans held for investment, net | $ 13,108,425 | $ 11,630,591

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 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 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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