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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Loans in repayment and percentage of each status: |  |  |  |
Private Education Loans allowance for losses | $ (358,325) | $ (341,121) | $ (272,123) | $ (251,475)
Loans held for investment, net | 23,498,386 | 22,270,919 |  |
Private Education Loans |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Private Education Loans, gross | 21,791,622 | 20,504,465 |  |
Private Education Loans deferred origination costs | 70,858 | 68,321 |  |
Private Education Loans allowance for losses | (285,946) | (277,943) |  |
Loans held for investment, net | 21,576,534 | 20,294,843 |  |
Private Education Loans | Consumer Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in-school/grace/deferment | 5,870,853 | 5,260,445 |  |
Loans in forbearance | 610,209 | 577,164 |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans current | $ 14,927,591 | $ 14,289,705 |  |
Loans current (as a percentage) | 97.50% | 97.40% |  |
Total TDR loans in repayment | $ 15,310,560 | $ 14,666,856 |  |
Total TDR loans in repayment (as a percentage) | 100.00% | 100.00% |  |
Total Private Education Loans, gross | $ 21,791,622 | $ 20,504,465 |  |
Private Education Loans deferred origination costs | 70,858 | 68,321 |  |
Total Private Education Loans, gross | 21,862,480 | 20,572,786 |  |
Private Education Loans allowance for losses | (285,946) | (277,943) |  |
Loans held for investment, net | $ 21,576,534 | $ 20,294,843 |  |
Percentage of Private Education Loans in repayment | 70.30% | 71.50% |  |
Delinquencies as a percentage of Private Education Loans in repayment | 2.50% | 2.60% |  |
Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance | 3.80% | 3.80% |  |
Private Education Loans | Consumer Portfolio Segment | Loans delinquent 31-60 days |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 216,295 | $ 231,216 |  |
Loans delinquent (as a percentage) | 1.40% | 1.60% |  |
Private Education Loans | Consumer Portfolio Segment | Loans delinquent 61-90 days |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 104,199 | $ 95,105 |  |
Loans delinquent (as a percentage) | 0.70% | 0.70% |  |
Private Education Loans | Consumer Portfolio Segment | Loans delinquent, greater than 90 days |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 62,475 | $ 50,830 |  |
Loans delinquent (as a percentage) | 0.40% | 0.30% |  |
Personal Loans |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Private Education Loans, gross | $ 1,162,874 | $ 1,190,091 |  |
Private Education Loans deferred origination costs | 394 | 297 |  |
Private Education Loans allowance for losses | (70,619) | (62,201) |  |
Loans held for investment, net | 1,092,649 | 1,128,187 |  |
Personal Loans | Consumer Portfolio Segment |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans current | $ 1,141,664 | $ 1,172,776 |  |
Loans current (as a percentage) | 98.20% | 98.50% |  |
Total TDR loans in repayment | $ 1,162,874 | $ 1,190,091 |  |
Total TDR loans in repayment (as a percentage) | 100.00% | 100.00% |  |
Total Private Education Loans, gross | $ 1,162,874 | $ 1,190,091 |  |
Private Education Loans deferred origination costs | 394 | 297 |  |
Total Private Education Loans, gross | 1,163,268 | 1,190,388 |  |
Private Education Loans allowance for losses | (70,619) | (62,201) |  |
Loans held for investment, net | $ 1,092,649 | $ 1,128,187 |  |
Delinquencies as a percentage of Private Education Loans in repayment | 1.80% | 1.50% |  |
Personal Loans | Consumer Portfolio Segment | Loans delinquent 31-60 days |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 9,224 | $ 6,722 |  |
Loans delinquent (as a percentage) | 0.80% | 0.60% |  |
Personal Loans | Consumer Portfolio Segment | Loans delinquent 61-90 days |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 5,991 | $ 5,416 |  |
Loans delinquent (as a percentage) | 0.50% | 0.50% |  |
Personal Loans | Consumer Portfolio Segment | Loans delinquent, greater than 90 days |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 5,995 | $ 5,177 |  |
Loans delinquent (as a percentage) | 0.50% | 0.40% |  |

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