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Allowance for Loan Losses - Age Analysis of Past Due Loan Delinquencies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Private Education Loans allowance for losses | $ (112,507) | $ (83,842) | $ (68,081) | $ (69,189)
Troubled Debt Restructured Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in in-school/grace/deferment | 6,869 | 2,915 |  |
Loans in forbearance | 43,756 | 18,620 |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans current | 185,936 | 34,554 |  |
Total TDR loans in repayment | $ 215,206 | $ 37,867 |  |
Loans current, in percentage | 86.40% | 91.20% |  |
Loans in repayment, in percentage | 100.00% | 100.00% |  |
Total TDR loans, gross | $ 265,831 | $ 59,402 |  |
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in in-school/grace/deferment | 3,427,964 | 3,027,143 | 2,574,711 |
Loans in forbearance | 241,207 | 135,018 | 16,314 |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans current | 6,773,095 | 5,045,600 | 3,933,143 |
Total TDR loans in repayment | $ 6,927,266 | $ 5,149,215 | $ 3,972,317 |
Loans current, in percentage | 97.80% | 98.00% | 99.00% |
Loans in repayment, in percentage | 100.00% | 100.00% | 100.00% |
Total TDR loans, gross | $ 10,596,437 | $ 8,311,376 | $ 6,563,342 |
Private Education Loans deferred origination costs | 27,884 | 13,845 | 5,063 |
Total Private Education Loans | 10,624,321 | 8,325,221 | 6,568,405 |
Private Education Loans allowance for losses | (108,816) | (78,574) | (61,763) | $ (65,218)
Percentage of Private Education Loans in repayment(4) | $ 10,515,505 | $ 8,246,647 | $ 6,506,642 |
Percentage of Private Education Loans in repayment(4) | 65.40% | 62.00% | 60.50% |
Delinquencies as a percentage of Private Education Loans in repayment(4) | 2.20% | 2.00% | 1.00% |
Loans in forbearance as a percentage of loans in repayment and forbearance(4) | 3.40% | 2.60% | 0.40% |
31 to 60 Days Past Due | Troubled Debt Restructured Loans |  |  |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans delinquent 31-60 days | $ 14,948 | $ 1,953 |  |
Loans delinquent 31-60 days, in percentage | 6.90% | 5.20% |  |
31 to 60 Days Past Due | Private Education Loans |  |  |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans delinquent 31-60 days | $ 91,129 | $ 63,873 | $ 28,854 |
Loans delinquent 31-60 days, in percentage | 1.30% | 1.20% | 0.70% |
61 to 90 Days Past Due | Troubled Debt Restructured Loans |  |  |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans delinquent 31-60 days | $ 9,239 | $ 983 |  |
Loans delinquent 31-60 days, in percentage | 4.30% | 2.60% |  |
61 to 90 Days Past Due | Private Education Loans |  |  |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans delinquent 31-60 days | $ 42,048 | $ 29,041 | $ 10,280 |
Loans delinquent 31-60 days, in percentage | 0.60% | 0.60% | 0.30% |
Equal to Greater than 90 Days Past Due | Troubled Debt Restructured Loans |  |  |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans delinquent 31-60 days | $ 5,083 | $ 377 |  |
Loans delinquent 31-60 days, in percentage | 2.40% | 1.00% |  |
Equal to Greater than 90 Days Past Due | Private Education Loans |  |  |  |
TDR loans in repayment(3) and percentage of each status: |  |  |  |
Loans delinquent 31-60 days | $ 20,994 | $ 10,701 | $ 40 |
Loans delinquent 31-60 days, in percentage | 0.30% | 0.20% | 0.00% |

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