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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 | Mar. 31, 2020 | Dec. 31, 2019
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TDR loans in repayment and percentage of each status: |  |
Total Private Education Loans in repayment | $ 455,960 | $ 2,355,395
Total | 14,516,211 | 16,315,651
Troubled Debt Restructured Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | 83,964 | 87,749
TDR loans in forbearance | 162,048 | 99,054
TDR loans in repayment and percentage of each status: |  |
Loans current | 1,113,104 | 1,230,954
Total Private Education Loans in repayment | $ 1,272,751 | $ 1,395,163
Loans current, percentage | 87.50% | 88.20%
Total TDR loans in repayment | 100.00% | 100.00%
Total | $ 1,518,763 | $ 1,581,966
Loan delinquency 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | 254,625 | 288,051
Loan delinquency 31-60 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 74,856 | $ 85,555
Loans delinquent | 5.90% | 6.10%
Loan delinquency 61-90 |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 135,896 | $ 121,302
Loan delinquency 61-90 | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 50,237 | $ 49,626
Loans delinquent | 3.90% | 3.60%
Loan delinquency greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 81,613 | $ 62,666
Loan delinquency greater than 90 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 34,554 | $ 29,028
Loans delinquent | 2.70% | 2.10%

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