Business and Summary of Significant Accounting Policies - Credit Quality Indicators (Details) - USD ($) |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans receivable, net | $ 84,804,000 | $ 85,795,000 |
| FICO Score, Less than 600 | ||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans receivable, net | 0.018 | 0.011 |
| FICO Score, 600 to 699 | ||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans receivable, net | 0.781 | 0.798 |
| FICO Score, Greater than 700 | ||
| Financing Receivable, Recorded Investment [Line Items] | ||
| Loans receivable, net | $ 0.201 | $ 0.191 |