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SHARE BASED COMPENSATION PLANS - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Number of Shares [Roll Forward]      
Options outstanding, beginning of period (in shares) 227,271 376,680  
Granted (in shares) 0 0 0
Exercised (in shares) (71,310) (88,158)  
Forfeited or expired (in shares) 0 (61,251)  
Options outstanding, end of period (in shares) 155,961 227,271 376,680
Options exercisable end of year (in shares) 155,961 227,271  
Weighted Average Exercise Price [Roll Forward]      
Options outstanding, beginning of period (in dollars per share) $ 7.54 $ 8.58  
Granted (in dollars per share) 0 0  
Exercised (in dollars per share) 5.48 11.13  
Forfeited or expired (in dollars per share) 0.00 9  
Options outstanding, end of period (in dollars per share) 8.48 7.54 $ 8.58
Options exercisable end of year (in dollars per share) $ 8.48 $ 7.54  
Weighted Average Remaining Contractual Term (Yrs) [Abstract]      
Options outstanding , weighted average remaining contractual term (Yrs) 1 year 9 months 11 days 2 years 3 months 11 days 2 years 8 months 5 days
Options exercisable end of year, weighted average remaining contractual term (Yrs) 1 year 9 months 11 days 2 years 3 months 11 days  
Aggregate Intrinsic Value [Abstract]      
Options outstanding, beginning of period $ 4,225 $ 4,379  
Granted 0 0  
Exercised 1,909 1,790 $ 1,500
Forfeited or expired 0 1,464  
Options outstanding, end of period $ 2,974 4,225 $ 4,379
Options exercisable end of year   $ 4,225