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Allowance for Loan Losses Allowance for Loan Losses - Loan Status of Private Education Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Allowance | $ 341,121 | $ 251,475 | $ 184,701 | $ 112,507
Consumer Portfolio Segment | Student Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in in-school/grace/deferment | 5,260,445 | 4,757,732 | 4,189,955 |
Loans in forbearance | 577,164 | 468,402 | 351,962 |
Loans current | $ 14,289,705 | $ 11,911,128 | $ 9,509,394 |
Loans current, in percentage | 97.40% | 97.60% | 97.90% |
Total TDR loans in repayment | $ 14,666,856 | $ 12,206,033 | $ 9,709,758 |
Loans in repayment, in percentage | 100.00% | 100.00% | 100.00% |
Loans Gross | $ 20,504,465 | $ 17,432,167 | $ 14,251,675 |
Net Unamortized Premium Or Discount | 68,321 | 56,378 | 44,206 |
Loans | 20,572,786 | 17,488,545 | 14,295,881 |
Loans and Leases Receivable, Allowance | 277,943 | 243,715 | 182,472 |
Loans Receivable, Net | $ 20,294,843 | $ 17,244,830 | $ 14,113,409 |
Percentage Of Loans In Repayment | 71.50% | 70.00% | 68.10% |
Delinquencies As Percentage Of Loans In Repayment | 2.60% | 2.40% | 2.10% |
Loans In Forbearance As Percentage Of Loans In Repayment And Forbearance | 3.80% | 3.70% | 3.50% |
Loans delinquent 31-60 days | Consumer Portfolio Segment | Student Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans delinquent | $ 231,216 | $ 179,002 | $ 124,773 |
Loans delinquent (in percentage) | 1.60% | 1.50% | 1.30% |
Loans delinquent 61-90 days | Consumer Portfolio Segment | Student Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans delinquent | $ 95,105 | $ 78,292 | $ 51,423 |
Loans delinquent (in percentage) | 0.70% | 0.60% | 0.50% |
Loans delinquent greater than 90 days | Consumer Portfolio Segment | Student Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans delinquent | $ 50,830 | $ 37,611 | $ 24,168 |
Loans delinquent (in percentage) | 0.30% | 0.30% | 0.30% |

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