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STOCK-BASED COMPENSATION PLANS - Stock Option Activity (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Number of Shares      
Outstanding at beginning of year 205,209    
Granted 22,665    
Exercised (6,840) (85,083) (200,631)
Forfeited or expired (3,960)    
Outstanding at end of year 217,074 205,209  
Vested and expected to vest 217,074    
Exercisable at end of year 126,264    
Weighted Average Exercise Price      
Outstanding at beginning of year $ 16.04    
Granted 21.10    
Exercised 15.09    
Forfeited or expired 16.84    
Outstanding at end of year 16.58 $ 16.04  
Vested and expected to vest 16.58    
Exercisable at end of year $ 14.81    
Weighted Average Remaining Contractual Term (Years)      
Exercisable at end of period 6 years 2 months 12 days    
Vested and expected to vest 6 years 2 months 12 days    
Exercisable at end of period 5 years 6 months    
Aggregate Intrinsic Value      
Outstanding at end of period $ 2,132,000    
Vested and expected to vest 2,132,000    
Exercisable at end of period $ 1,661,000