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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 | Jun. 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 | $ 666,681 | $ 2,355,395
Total | 14,190,329 | 16,315,651
Troubled Debt Restructured Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | 80,591 | 87,749
TDR loans in repayment and percentage of each status: |  |
TDR loans in forbearance - current | 233,871 | 99,054
Total TDR loans in forbearance | $ 257,661 | $ 99,054
Loans in forbearance, current | 90.70% | 100.00%
Total TDR loans in forbearance | 100.00% | 100.00%
Loans current | $ 1,070,807 | $ 1,230,954
Total Private Education Loans in repayment, 2020 | $ 1,181,988 | $ 1,395,163
Loans current | 90.60% | 88.20%
Total TDR loans in repayment | 100.00% | 100.00%
Total | $ 1,520,240 | $ 1,581,966
Loan delinquency 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | 166,584 | 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 | $ 11,797 | $ 0
Loans in forbearance, delinquent | 4.60% | 0.00%
Loans delinquent | $ 49,098 | $ 85,555
Loans delinquent | 4.20% | 6.10%
Loan delinquency 61-90 |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 99,653 | $ 121,302
Loan delinquency 61-90 | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
TDR loans in forbearance - delinquent | $ 7,906 | $ 0
Loans in forbearance, delinquent | 3.10% | 0.00%
Loans delinquent | $ 35,544 | $ 49,626
Loans delinquent | 3.00% | 3.60%
Loan delinquency greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 56,157 | $ 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 | $ 4,087 | $ 0
Loans in forbearance, delinquent | 1.60% | 0.00%
Loans delinquent | $ 26,539 | $ 29,028
Loans delinquent | 2.20% | 2.10%

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