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SHARE BASED COMPENSATION PLANS - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Number of Shares [Roll Forward]      
Options outstanding, beginning of period (in shares) 189,088 235,766  
Granted (in shares) 0 0  
Exercised (in shares) (63,528) (46,678)  
Forfeited or expired (in shares) 0 0  
Options outstanding, end of period (in shares) 125,560 189,088 235,766
Options exercisable end of year (in shares) 125,560 189,088  
Weighted Average Exercise Price [Roll Forward]      
Options outstanding, beginning of period (in dollars per share) $ 25.74 $ 25.20  
Granted (in dollars per share) 0.00 0.00  
Exercised (in dollars per share) 25.77 22.98  
Forfeited or expired (in dollars per share) 0.00 0.00  
Options outstanding, end of period (in dollars per share) 25.73 25.74 $ 25.20
Options exercisable end of year (in dollars per share) $ 25.73 $ 25.74  
Weighted Average Remaining Contractual Term (Yrs) [Abstract]      
Options outstanding , weighted average remaining contractual term (Yrs) 2 years 8 months 5 days 3 years 1 month 28 days 3 years 9 months 11 days
Options exercisable end of year, weighted average remaining contractual term (Yrs) 2 years 8 months 5 days 3 years 1 month 28 days  
Aggregate Intrinsic Value [Abstract]      
Options outstanding, beginning of period $ 3,027 $ 2,507  
Granted 0 0  
Exercised 1,510 925 $ 1,400
Forfeited or expired 0 0  
Options outstanding, end of period $ 4,379 3,027 $ 2,507
Options exercisable end of year   $ 3,027