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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, 2021 | Dec. 31, 2020
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TDR loans in repayment and percentage of each status: |  |
Total Private Education Loans in repayment, 2021 | $ 1,834,164 |
Troubled Debt Restructured Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | 90,417 | $ 88,750
TDR loans in forbearance | 48,892 | 76,704
TDR loans in repayment and percentage of each status: |  |
Loans | 1,148,282 | 1,274,590
Total Private Education Loans in repayment, 2021 | $ 1,008,973 | $ 1,109,136
Total TDR loans in repayment | 100.00% | 100.00%
Total | $ 1,148,282 | $ 1,274,590
Loan delinquent, current |  |
TDR loans in repayment and percentage of each status: |  |
Loans | 15,115,541 | 13,898,948
Total | 15,115,541 | 13,898,948
Loan delinquent, current | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans | $ 917,756 | $ 971,880
Loans current | 91.00% | 87.70%
Total | $ 917,756 | $ 971,880
Loan delinquent 30-59 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans | 199,942 | 205,528
Total | 199,942 | 205,528
Loan delinquent 30-59 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans | $ 43,766 | $ 59,249
Loans delinquent | 4.30% | 5.30%
Total | $ 43,766 | $ 59,249
Loan delinquent 60-89 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans | 101,512 | 119,643
Total | 101,512 | 119,643
Loan delinquent 60-89 days | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans | $ 24,984 | $ 43,576
Loans delinquent | 2.50% | 3.90%
Total | $ 24,984 | $ 43,576
Loan delinquent 90 days or greater past due |  |
TDR loans in repayment and percentage of each status: |  |
Loans | 73,137 | 80,702
Total | 73,137 | 80,702
Loan delinquent 90 days or greater past due | Troubled Debt Restructured Loans |  |
TDR loans in repayment and percentage of each status: |  |
Loans | $ 22,467 | $ 34,431
Loans delinquent | 2.20% | 3.10%
Total | $ 22,467 | $ 34,431

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