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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 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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TDR loans in repayment and percentage of each status: |  |  |
Total Private Education Loans in forbearance, Year 1 | $ 2,253,860 | $ 2,052,521 | $ 2,355,395
Troubled Debt Restructured Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
TDR loans in in-school/grace/deferment | 80,281 | 88,750 |
TDR loans in forbearance | 41,464 | 76,704 |
TDR loans in repayment and percentage of each status: |  |  |
Loans | 1,057,665 | 1,274,590 |
Total Private Education Loans in forbearance, Year 1 | $ 935,920 | $ 1,109,136 |
Total TDR loans in repayment | 100.00% | 100.00% |
Total | $ 1,057,665 | $ 1,274,590 |
Loan delinquent, current |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | 15,005,773 | 13,898,948 | 16,315,651
Total | 15,005,773 | 13,898,948 | 16,315,651
Loan delinquent, current | Troubled Debt Restructured Loans |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | $ 832,018 | $ 971,880 |
Loans current, in percentage | 88.90% | 87.70% |
Total | $ 832,018 | $ 971,880 |
Loan delinquent 30-59 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | 308,559 | 205,528 | 288,051
Total | 308,559 | 205,528 | 288,051
Loan delinquent 30-59 days | Troubled Debt Restructured Loans |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | $ 48,766 | $ 59,249 |
Loans delinquent (in percentage) | 5.20% | 5.30% |
Total | $ 48,766 | $ 59,249 |
Loan delinquent 60-89 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | 116,947 | 119,643 | 121,302
Total | 116,947 | 119,643 | 121,302
Loan delinquent 60-89 days | Troubled Debt Restructured Loans |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | $ 30,575 | $ 43,576 |
Loans delinquent (in percentage) | 3.30% | 3.90% |
Total | $ 30,575 | $ 43,576 |
Loan delinquent 90 days or greater past due |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | 79,933 | 80,702 | 62,666
Total | 79,933 | 80,702 | $ 62,666
Loan delinquent 90 days or greater past due | Troubled Debt Restructured Loans |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans | $ 24,561 | $ 34,431 |
Loans delinquent (in percentage) | 2.60% | 3.10% |
Total | $ 24,561 | $ 34,431 |

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