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Allowance for Loan Losses - Age Analysis of Past Due Loan Delinquencies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
TDR loans in repayment and percentage of each status: |  |  |  |
Private Education Loans allowance for losses | $ (184,643) | $ (112,507) | $ (83,842) | $ (68,081)
Student Loan | Consumer Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in in-school/grace/deferment | 4,189,955 | 3,427,964 | 3,027,143 |
Loans in forbearance | 351,962 | 241,207 | 135,018 |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans current | 9,509,394 | 6,773,095 | 5,045,600 |
Total TDR loans in repayment | $ 9,709,758 | $ 6,927,266 | $ 5,149,215 |
Loans current, in percentage | 97.90% | 97.80% | 98.00% |
Loans in repayment, in percentage | 100.00% | 100.00% | 100.00% |
Total TDR loans, gross | $ 14,251,675 | $ 10,596,437 | $ 8,311,376 |
Private Education Loans deferred origination costs | 44,206 | 27,884 | 13,845 |
Total Private Education Loans | 14,295,881 | 10,624,321 | 8,325,221 |
Private Education Loans allowance for losses | (182,472) | (108,816) | (78,574) |
Percentage of Private Education Loans in repayment | $ 14,113,409 | $ 10,515,505 | $ 8,246,647 |
Percentage of Private Education Loans in repayment | 68.10% | 65.40% | 62.00% |
Delinquencies as a percentage of Private Education Loans in repayment | 2.10% | 2.20% | 2.00% |
Loans in forbearance as a percentage of Private Education Loans in repayment and forbearance | 3.50% | 3.40% | 2.60% |
Student Loan | Consumer Portfolio Segment | Loans delinquent 31-60 days |  |  |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 124,773 | $ 91,129 | $ 63,873 |
Loans delinquent (in percentage) | 1.30% | 1.30% | 1.20% |
Student Loan | Consumer Portfolio Segment | Loans delinquent 61-90 days |  |  |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 51,423 | $ 42,048 | $ 29,041 |
Loans delinquent (in percentage) | 0.50% | 0.60% | 0.60% |
Student Loan | Consumer Portfolio Segment | Loans delinquent greater than 90 days |  |  |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 24,168 | $ 20,994 | $ 10,701 |
Loans delinquent (in percentage) | 0.30% | 0.30% | 0.20% |
Troubled Debt Restructured Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in in-school/grace/deferment | $ 24,185 | $ 6,869 |  |
Loans in forbearance | 71,851 | 43,756 |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans current | 462,187 | 185,936 |  |
Total TDR loans in repayment | $ 516,570 | $ 215,206 |  |
Loans current, in percentage | 89.50% | 86.40% |  |
Loans in repayment, in percentage | 100.00% | 100.00% |  |
Total TDR loans, gross | $ 612,606 | $ 265,831 |  |
Troubled Debt Restructured Loans | Loans delinquent 31-60 days |  |  |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 28,452 | $ 14,948 |  |
Loans delinquent (in percentage) | 5.50% | 6.90% |  |
Troubled Debt Restructured Loans | Loans delinquent 61-90 days |  |  |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 17,326 | $ 9,239 |  |
Loans delinquent (in percentage) | 3.40% | 4.30% |  |
Troubled Debt Restructured Loans | Loans delinquent greater than 90 days |  |  |  |
TDR loans in repayment and percentage of each status: |  |  |  |
Loans delinquent | $ 8,605 | $ 5,083 |  |
Loans delinquent (in percentage) | 1.60% | 2.40% |  |

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