Loans Receivable - Aging of the Loans Receivable Balance (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2019 |
Dec. 31, 2018 |
|
| Financing Receivable, Past Due [Line Items] | ||
| Past due loans receivable | 15.20% | 14.60% |
| Current loans receivable | 84.80% | 85.40% |
| Balance of Credit Card Loans on Nonaccrual Status | $ 2,330 | $ 2,110 |
| 30-59 days past due | ||
| Financing Receivable, Past Due [Line Items] | ||
| Past due loans receivable | 6.60% | 6.90% |
| 60-89 days past due | ||
| Financing Receivable, Past Due [Line Items] | ||
| Past due loans receivable | 3.60% | 3.40% |
| 90 or more days past due | ||
| Financing Receivable, Past Due [Line Items] | ||
| Past due loans receivable | 5.00% | 4.30% |
| Balance of Loans Receivable 90 or More Days Past Due and Still Accruing Interest and Fees | $ 0 | $ 0 |