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DEBT OBLIGATIONS - Junior Subordinated Notes (Details) - Junior subordinated notes - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Debt Obligations      
Outstanding principal balance $ 37,400 $ 37,400  
Interest expense $ 1,853 $ 1,853 $ 1,853
August 1, 2012 through April 29, 2016      
Debt Obligations      
Interest Rate (as a percent) 4.90% 4.90%  
April 30, 2016 through April 30, 2036 | LIBOR      
Debt Obligations      
Margin interest above reference rate (as a percent) 2.00% 2.00%