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Allowance for Loan Losses - Age Analysis of Past Due Loan Delinquencies (Details) - Consumer Portfolio Segment - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Personal Loans |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans current | $ 1,172,776 | $ 398,988 |
Total TDR loans in repayment | $ 1,190,091 | $ 400,280 |
Loans current, in percentage | 98.50% | 99.70% |
Loans in repayment, in percentage | 100.00% | 100.00% |
Personal Loans | Financing Receivables, 30 to 59 Days Past Due |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 6,722 | $ 761 |
Loans delinquent (in percentage) | 0.60% | 0.20% |
Personal Loans | Financing Receivables, 60 to 89 Days Past Due |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 5,416 | $ 340 |
Loans delinquent (in percentage) | 0.50% | 0.10% |
Personal Loans | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 5,177 | $ 191 |
Loans delinquent (in percentage) | 0.40% | 0.00% |
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
TDR loans in repayment and percentage of each status: |  |  |
Loans current | 14,289,705 | 11,911,128 | 9,509,394
Total TDR loans in repayment | $ 14,666,856 | $ 12,206,033 | $ 9,709,758
Loans current, in percentage | 97.40% | 97.60% | 97.90%
Loans in repayment, in percentage | 100.00% | 100.00% | 100.00%
Total TDR loans, gross | $ 20,504,465 | $ 17,432,167 | $ 14,251,675
Student Loan | Loans delinquent 31-60 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 231,216 | $ 179,002 | $ 124,773
Loans delinquent (in percentage) | 1.60% | 1.50% | 1.30%
Student Loan | Loans delinquent 61-90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 95,105 | $ 78,292 | $ 51,423
Loans delinquent (in percentage) | 0.70% | 0.60% | 0.50%
Student Loan | Loans delinquent greater than 90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 50,830 | $ 37,611 | $ 24,168
Loans delinquent (in percentage) | 0.30% | 0.30% | 0.30%
Troubled Debt Restructured Loans | Student Loan |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans in in-school/grace/deferment | $ 69,212 | $ 51,745 |
Loans in forbearance | 69,796 | 69,652 |
TDR loans in repayment and percentage of each status: |  |  |
Loans current | 994,411 | 774,222 |
Total TDR loans in repayment | $ 1,118,848 | $ 868,954 |
Loans current, in percentage | 88.90% | 89.10% |
Loans in repayment, in percentage | 100.00% | 100.00% |
Total TDR loans, gross | $ 1,257,856 | $ 990,351 |
Troubled Debt Restructured Loans | Student Loan | Loans delinquent 31-60 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 63,074 | $ 48,377 |
Loans delinquent (in percentage) | 5.60% | 5.60% |
Troubled Debt Restructured Loans | Student Loan | Loans delinquent 61-90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 36,804 | $ 28,778 |
Loans delinquent (in percentage) | 3.30% | 3.30% |
Troubled Debt Restructured Loans | Student Loan | Loans delinquent greater than 90 days |  |  |
TDR loans in repayment and percentage of each status: |  |  |
Loans delinquent | $ 24,559 | $ 17,577 |
Loans delinquent (in percentage) | 2.20% | 2.00% |

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