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STOCK-BASED COMPENSATION - PERFORMANCE SHARES AND RESTRICTED STOCK ACTIVITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Nov. 09, 2022
Nov. 10, 2021
Nov. 09, 2020
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 166,091 155,731 130,509      
Granted (in shares) 118,526 116,951 82,064      
Vested (in shares) (76,708) (54,918) (55,025)      
Cancelled/forfeited (in shares) (15,788) (51,673) (1,817)      
Outstanding at end of period (in shares) 192,121 166,091 155,731      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 36.08 $ 44.22 $ 46.53      
Granted (in dollars per share) 38.84 33.34 40.61      
Vested (in dollars per share) 39.57 44.64 44.27      
Cancelled/forfeited (in dollars per share) 37.33 45.32 44.38      
Outstanding at end of period (in dollars per share) $ 36.29 $ 36.08 $ 44.22      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 2,765 $ 1,673 $ 2,083      
Percent of awards to common stock         93.00% 114.00%
Number of common shares issued (in shares)         31,116 28,513
Percent of awards to common stock, target         100.00% 100.00%
Performance share awards | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       105.00%    
Number of common shares issued (in shares)       26,282    
Percent of awards to common stock, target       100.00%    
Performance share awards | Minimum            
Total Fair Value of Vested Shares            
Percent of awards to common stock 0.00%          
Performance share awards | Maximum            
Total Fair Value of Vested Shares            
Percent of awards to common stock 150.00%          
Performance Shares, Subject to Performance Conditions            
Shares            
Outstanding at beginning of period (in shares) 70,138 48,941        
Outstanding at end of period (in shares) 73,561 70,138 48,941      
Total Fair Value of Vested Shares            
Number of common shares issued (in shares)           0
Performance-based Restricted Stock            
Total Fair Value of Vested Shares            
Percent of awards to common stock         100.00% 100.00%
Number of common shares issued (in shares)         25,982 11,139
Performance-based Restricted Stock | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       100.00%    
Number of common shares issued (in shares)       28,965    
Performance Shares, TSR            
Total Fair Value of Vested Shares            
Number of common shares issued (in shares)         0  
Performance Shares, TSR | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       112.00%    
Number of common shares issued (in shares)       30,472    
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 101,621 73,486 58,156      
Granted (in shares) 54,826 67,726 42,478      
Vested (in shares) (47,867) (34,000) (25,973)      
Cancelled/forfeited (in shares) (10,756) (5,591) (1,175)      
Outstanding at end of period (in shares) 97,824 101,621 73,486      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 36.87 $ 43.52 $ 46.18      
Granted (in dollars per share) 38.84 33.34 40.61      
Vested (in dollars per share) 39.01 44.30 44.71      
Cancelled/forfeited (in dollars per share) 37.06 36.34 43.62      
Outstanding at end of period (in dollars per share) $ 36.90 $ 36.87 $ 43.52      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 1,824 $ 996 $ 1,073