DEBT OBLIGATIONS - Junior Subordinated Notes (Details) - Junior subordinated notes - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Debt Obligations | |||
| Outstanding principal balance | $ 37,400,000 | $ 37,400,000 | |
| Interest expense | $ 1,510,000 | $ 1,853,000 | $ 1,853,000 |
| April 30, 2016 through April 30, 2036 | LIBOR | |||
| Debt Obligations | |||
| Interest rate (as a percent) | 2.76% | ||
| Margin interest above reference rate (as a percent) | 2.00% | ||