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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 | Mar. 31, 2021 | Dec. 31, 2020
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TDR loans in repayment and percentage of each status: |  |
Total Private Education Loans in repayment, 2021 | $ 418,469 |
Total | 14,471,427 | $ 13,898,948
Troubled Debt Restructured Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | 93,850 | 88,750
TDR loans in repayment and percentage of each status: |  |
Total Private Education Loans in forbearance, 2021 | 68,609 | 76,704
Loans current | 966,201 | 971,880
Total Private Education Loans in repayment, 2021 | $ 1,063,145 | $ 1,109,136
Loans current | 90.90% | 87.70%
Total TDR loans in repayment | 100.00% | 100.00%
Total | $ 1,225,604 | $ 1,274,590
Loan delinquency 30-59 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | 152,743 | 205,528
Loan delinquency 30-59 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 39,541 | $ 59,249
Loans delinquent | 3.70% | 5.30%
Loan delinquency 60-89 days |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 86,390 | $ 119,643
Loan delinquency 60-89 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 29,892 | $ 43,576
Loans delinquent | 2.80% | 3.90%
Loan delinquency 90 days or greater past due |  |
TDR loans in repayment and percentage of each status: |  |
Total | $ 67,379 | $ 80,702
Loan delinquency 90 days or greater past due | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 27,511 | $ 34,431
Loans delinquent | 2.60% | 3.10%

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