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EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2019
USD ($)
hours
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS [Abstract]      
Number of hours of employment required for ESOP | hours 1,000    
Years of employment to be eligible for ESOP 1 year    
Eligible age for ESOP 21 years    
Employee Stock Ownership Plan (ESOP), Expense | $ $ 2.9 $ 2.1 $ 1.7
Contribution to ESOP | $ $ 3.2 $ 2.0 $ 1.6
Percentage of benefits vested after credited service 100.00%    
ESOP award vesting period 7 years    
Years of credited service 7 years    
Number of shares (ESOP) released (in shares) 98,753 72,996 61,458
Fair value of shares (ESOP) released (in dollars per share) | $ / shares $ 32.61 $ 27.55 $ 26.13
Allocated and total ESOP shares withdrawn from ESOP by participant no longer with the company (in shares) 79,926 6,687 42,378
Shares purchased for dividend reinvestment (in shares) 5,336 3,987 4,437
Year-end ESOP shares [Abstract]      
Allocated shares (in shares) 778,088 812,346 768,657
Unearned shares (in shares) 0 0 0
Total ESOP shares (in shares) 778,088 812,346 768,657
Fair value of unearned shares | $ $ 0.0 $ 0.0 $ 0.0
Contribution expense to profit sharing plan included in compensation and benefits | $ $ 3.3 $ 2.2 $ 1.6