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Allowance for Loan Losses - Loan Status of Personal Education Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ (441,912) | $ (341,121) | $ (251,475) | $ (184,701)
Loans held for investment (net of allowance for losses of $441,912 and $341,121, respectively) | 24,667,792 | 22,270,919 |  |
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | 1,049,007 | 1,190,091 |  |
Deferred origination costs and unamortized premium/ (discount) | 513 | 297 |  |
Allowance for loan losses | (65,877) | (62,201) |  |
Loans held for investment (net of allowance for losses of $441,912 and $341,121, respectively) | 983,643 | 1,128,187 |  |
Consumer Portfolio Segment | Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans current | $ 1,023,517 | $ 1,172,776 |  |
Loans current, in percentage | 97.60% | 98.50% |  |
Total TDR loans in repayment | $ 1,049,007 | $ 1,190,091 |  |
Loans in repayment, in percentage | 100.00% | 100.00% |  |
Private Education Loans | $ 1,049,007 | $ 1,190,091 |  |
Deferred origination costs and unamortized premium/ (discount) | 513 | 297 |  |
Total Personal Loans | 1,049,520 | 1,190,388 |  |
Allowance for loan losses | (65,877) | (62,201) |  |
Loans held for investment (net of allowance for losses of $441,912 and $341,121, respectively) | $ 983,643 | $ 1,128,187 |  |
Delinquencies as a percentage of Private Education Loans in repayment | 2.40% | 1.50% |  |
Consumer Portfolio Segment | Personal Loans | Loans delinquent 31-60 days |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans delinquent | $ 9,435 | $ 6,722 |  |
Loans delinquent (in percentage) | 0.90% | 0.60% |  |
Consumer Portfolio Segment | Personal Loans | Loans delinquent 61-90 days |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans delinquent | $ 7,172 | $ 5,416 |  |
Loans delinquent (in percentage) | 0.70% | 0.50% |  |
Consumer Portfolio Segment | Personal Loans | Loans delinquent greater than 90 days |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans delinquent | $ 8,883 | $ 5,177 |  |
Loans delinquent (in percentage) | 0.80% | 0.40% |  |

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