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Loans Held for Investment - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) payment | Dec. 31, 2015 USD ($) | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |
Percent of private loans indexed to LIBOR (as a percentage) | 81.00% |  |  |  |
Tier 1 of government guarantee |  |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  | 100.00%
Newly originated personal loans | $ 12,900,000 |  |  |  |
Estimated weighted average life of student loans | 6 years | 6 years 2 months 6 days |  |  |
Number of payments to qualify for Private Education Loan program | payment | 3 |  |  |  |
Period of interest rate reduction | 24 months |  |  |  |
Period of loans past due that have accrued interest | 90 days |  |  |  |
Loans in nonaccrual status | $ 0 | $ 0 |  |  |
FFELP Loans |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |
90 or more days delinquent | 67,500,000 | 122,900,000 |  |  |
Private Education Loans |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |
90 or more days delinquent | 24,200,000 | 20,900,000 |  |  |
FFELP Loans |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |
Loans pledged to Borrower in Custody | 0 | 0 |  |  |
Private Education Loans |  |  |  |  |
Finance Receivable Transferred To Held For Sale [Line Items] |  |  |  |  |
Loans pledged to Borrower in Custody | $ 2,700,000,000 | $ 1,700,000,000 |  |  |

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