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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Loans in repayment and percentage of each status: |  |  |  |  |  |
Private Education Loans allowance for losses | $ (164,839) | $ (112,507) | $ (144,925) | $ (104,203) | $ (91,866) | $ (83,842)
Private Education Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans in-school/grace/deferment | 4,662,941 | 3,427,964 |  |  |  |
Loans in forbearance | 279,509 | 241,207 |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans current | 8,724,365 | 6,773,095 |  |  |  |
Total Private Education Loans in repayment | 8,905,812 | 6,927,266 |  |  |  |
Total Private Education loans, gross | 13,848,262 | 10,596,437 |  |  |  |
Private Education Loans deferred origination costs | 40,327 | 27,884 |  |  |  |
Total Private Education Loans | 13,888,589 | 10,624,321 |  |  |  |
Private Education Loans allowance for losses | (162,630) | (108,816) | $ (142,628) | $ (100,033) | $ (87,310) | $ (78,574)
Private Education Loans, net | $ 13,725,959 | $ 10,515,505 |  |  |  |
Loans current (as a percentage) | 98.00% | 97.80% |  |  |  |
Total Private Education Loans in repayment (as a percentage) | 100.00% | 100.00% |  |  |  |
Percentage of Private Education Loans in repayment (as a percentage) | 64.30% | 65.40% |  |  |  |
Delinquencies as a percentage of Private Education Loans in repayment (as a percentage) | 2.00% | 2.20% |  |  |  |
Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance (as a percentage) | 3.00% | 3.40% |  |  |  |
Loans delinquent 31-60 days | Private Education Loans |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 108,591 | $ 91,129 |  |  |  |
Loans delinquent (as a percentage) | 1.20% | 1.30% |  |  |  |
Loans delinquent 61-90 days | Private Education Loans |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 51,029 | $ 42,048 |  |  |  |
Loans delinquent (as a percentage) | 0.60% | 0.60% |  |  |  |
Loans delinquent greater than 90 days | Private Education Loans |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 21,827 | $ 20,994 |  |  |  |
Loans delinquent (as a percentage) | 0.20% | 0.30% |  |  |  |

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