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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Loans in repayment and percentage of each status: |  |  |  |  |  |
Private Education Loans allowance for losses | $ (328,974) | $ (295,277) | $ (251,475) | $ (229,919) | $ (207,448) | $ (184,701)
Loans held for investment, net | 21,978,903 |  | 18,567,641 |  |  |
Private Education Loans |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Private Education Loans deferred origination costs | 65,499 |  | 56,378 |  |  |
Total Private Education Loans, gross | 20,239,991 |  | 17,432,167 |  |  |
Private Education Loans allowance for losses | (274,684) |  | (243,715) |  |  |
Loans held for investment, net | 20,030,806 |  | 17,244,830 |  |  |
Private Education Loans | Consumer Portfolio Segment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans in-school/grace/deferment | 5,936,033 |  | 4,757,732 |  |  |
Loans in forbearance | 488,543 |  | 468,402 |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans current | $ 13,492,029 |  | $ 11,911,128 |  |  |
Loans current (as a percentage) | 97.70% |  | 97.60% |  |  |
Total TDR loans in repayment | $ 13,815,415 |  | $ 12,206,033 |  |  |
Total TDR loans in repayment (as a percentage) | 100.00% |  | 100.00% |  |  |
Private Education Loans deferred origination costs | $ 65,499 |  | $ 56,378 |  |  |
Total Private Education Loans, gross | 20,305,490 |  | 17,488,545 |  |  |
Total Private Education Loans, gross | 20,239,991 |  | 17,432,167 |  |  |
Private Education Loans allowance for losses | (274,684) |  | (243,715) |  |  |
Loans held for investment, net | $ 20,030,806 |  | $ 17,244,830 |  |  |
Percentage of Private Education Loans in repayment | 68.30% |  | 70.00% |  |  |
Delinquencies as a percentage of Private Education Loans in repayment | 2.30% |  | 2.40% |  |  |
Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance | 3.40% |  | 3.70% |  |  |
Private Education Loans | Consumer Portfolio Segment | Loans delinquent 31-60 days |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 198,987 |  | $ 179,002 |  |  |
Loans delinquent (as a percentage) | 1.40% |  | 1.50% |  |  |
Private Education Loans | Consumer Portfolio Segment | Loans delinquent 61-90 days |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 82,358 |  | $ 78,292 |  |  |
Loans delinquent (as a percentage) | 0.60% |  | 0.60% |  |  |
Private Education Loans | Consumer Portfolio Segment | Loans delinquent, greater than 90 days |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 42,041 |  | $ 37,611 |  |  |
Loans delinquent (as a percentage) | 0.30% |  | 0.30% |  |  |
Personal Loans |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Private Education Loans deferred origination costs | $ 164 |  | $ 0 |  |  |
Total Private Education Loans, gross | 1,133,005 |  | 400,280 |  |  |
Private Education Loans allowance for losses | (53,210) |  | (6,628) |  |  |
Loans held for investment, net | 1,079,959 |  | 393,652 |  |  |
Personal Loans | Consumer Portfolio Segment |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans current | $ 1,123,597 |  | $ 398,988 |  |  |
Loans current (as a percentage) | 99.20% |  | 99.70% |  |  |
Total TDR loans in repayment | $ 1,133,005 |  | $ 400,280 |  |  |
Total TDR loans in repayment (as a percentage) | 100.00% |  | 100.00% |  |  |
Private Education Loans deferred origination costs | $ 164 |  | $ 0 |  |  |
Total Private Education Loans, gross | 1,133,169 |  | 400,280 |  |  |
Total Private Education Loans, gross | 1,133,005 |  | 400,280 |  |  |
Private Education Loans allowance for losses | (53,210) |  | (6,628) |  |  |
Loans held for investment, net | $ 1,079,959 |  | $ 393,652 |  |  |
Delinquencies as a percentage of Private Education Loans in repayment | 0.80% |  | 0.30% |  |  |
Personal Loans | Consumer Portfolio Segment | Loans delinquent 31-60 days |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 4,321 |  | $ 761 |  |  |
Loans delinquent (as a percentage) | 0.40% |  | 0.20% |  |  |
Personal Loans | Consumer Portfolio Segment | Loans delinquent 61-90 days |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 2,804 |  | $ 340 |  |  |
Loans delinquent (as a percentage) | 0.20% |  | 0.10% |  |  |
Personal Loans | Consumer Portfolio Segment | Loans delinquent, greater than 90 days |  |  |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |  |  |
Loans delinquent | $ 2,283 |  | $ 191 |  |  |
Loans delinquent (as a percentage) | 0.20% |  | 0.00% |  |  |

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