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Allowance for Loan Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Student Loan - Consumer Portfolio Segment - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 5,352,671 | $ 4,189,955
TDR loans in forbearance | 373,655 | 351,962
TDR loans in repayment and percentage of each status: |  |
Loans current | 11,115,697 | 9,509,394
Total TDR loans in repayment | 11,406,581 | 9,709,758
Total TDR loans, gross | $ 17,132,907 | $ 14,251,675
Loans current (as a percentage) | 97.40% | 97.90%
Total TDR loans in repayment | 100.00% | 100.00%
Troubled Debt Restructured Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 49,287 | $ 24,185
TDR loans in forbearance | 118,034 | 71,851
TDR loans in repayment and percentage of each status: |  |
Loans current | 692,282 | 462,187
Total TDR loans in repayment | 775,240 | 516,570
Total TDR loans, gross | $ 942,561 | $ 612,606
Loans current (as a percentage) | 89.30% | 89.50%
Total TDR loans in repayment | 100.00% | 100.00%
Loans delinquent 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 175,897 | $ 124,773
Loans delinquent (as a percentage) | 1.60% | 1.30%
Loans delinquent 31-60 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 43,362 | $ 28,452
Loans delinquent (as a percentage) | 5.60% | 5.50%
Loans delinquent 61-90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 82,095 | $ 51,423
Loans delinquent (as a percentage) | 0.70% | 0.50%
Loans delinquent 61-90 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 25,268 | $ 17,326
Loans delinquent (as a percentage) | 3.30% | 3.40%
Loans delinquent, greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 32,892 | $ 24,168
Loans delinquent (as a percentage) | 0.30% | 0.30%
Loans delinquent, greater than 90 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 14,328 | $ 8,605
Loans delinquent (as a percentage) | 1.80% | 1.60%

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