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Allowance for Loan Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Student Loan - Consumer Portfolio Segment - Troubled Debt Restructured Loans - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR loans in in-school/grace/deferment | $ 89,046 | $ 69,212
TDR loans in forbearance | 97,175 | 69,796
TDR loans in repayment and percentage of each status: |  |
Loans current | 1,137,771 | 994,411
Total TDR loans in repayment | $ 1,288,598 | $ 1,118,848
Loans current | 88.30% | 88.90%
Total TDR loans in repayment | 100.00% | 100.00%
Total Private Education Loans | $ 1,474,819 | $ 1,257,856
Loans delinquent 31-60 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 74,243 | $ 63,074
Loans delinquent | 5.70% | 5.60%
Loans delinquent 61-90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 47,500 | $ 36,804
Loans delinquent | 3.70% | 3.30%
Loans delinquent, greater than 90 days |  |
TDR loans in repayment and percentage of each status: |  |
Loans delinquent | $ 29,084 | $ 24,559
Loans delinquent | 2.30% | 2.20%

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