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Allowance for Credit Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Student Loan - Consumer Portfolio Segment - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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TDR loans in repayment and percentage of each status: |  |
Total Private Education Loans in repayment, 2020 | $ 1,763,684 |
Total | 15,375,006 | $ 16,315,651
Troubled Debt Restructured Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | 96,489 | 87,749
TDR loans in repayment and percentage of each status: |  |
TDR loans in forbearance - current | 102,973 | 99,054
Total TDR loans in forbearance | $ 103,112 | $ 99,054
Loans in forbearance, current | 99.90% | 100.00%
Total TDR loans in forbearance | 100.00% | 100.00%
Loans current | $ 1,139,598 | $ 1,230,954
Total Private Education Loans in repayment, 2020 | $ 1,295,560 | $ 1,395,163
Loans current | 87.90% | 88.20%
Total TDR loans in repayment(3) | 100.00% | 100.00%
Total | $ 1,495,161 | $ 1,581,966
Loan delinquency 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | 265,251 | 288,051
Loan delinquency 31-60 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
TDR loans in forbearance - delinquent | $ 139 | $ 0
Loans in forbearance, delinquent | 0.10% | 0.00%
Loans delinquent | $ 70,790 | $ 85,555
Loans delinquent | 5.50% | 6.10%
Loan delinquency 61-90 |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 139,823 | $ 121,302
Loan delinquency 61-90 | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
TDR loans in forbearance - delinquent | $ 0 | $ 0
Loans in forbearance, delinquent | 0.00% | 0.00%
Loans delinquent | $ 51,537 | $ 49,626
Loans delinquent | 4.00% | 3.60%
Loan delinquency greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 73,229 | $ 62,666
Loan delinquency greater than 90 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
TDR loans in forbearance - delinquent | $ 0 | $ 0
Loans in forbearance, delinquent | 0.00% | 0.00%
Loans delinquent | $ 33,635 | $ 29,028
Loans delinquent | 2.60% | 2.10%

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