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EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS (Details) - USD ($)
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS [Abstract]      
Number of hours of employment required for ESOP 1000 hours    
Years of employment to be eligible for ESOP 1 year    
Eligible age for ESOP 21 years    
Employee Stock Ownership Plan (ESOP), Expense $ 1,150,000 $ 994,000 $ 703,000
Contribution to ESOP $ 1,174,682 $ 992,038 $ 850,406
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) 19,381 23,750 24,125
Fair value of shares (ESOP) released (in dollars per share) $ 60.61 $ 41.77 $ 35.25
Allocated and total ESOP shares withdrawn from ESOP by participant no longer with the company (in shares) 15,502 10,294 10,643
Shares purchased for dividend reinvestment (in shares) 2,710 2,974 2,529
Year-end ESOP shares [Abstract]      
Allocated shares (in shares) 262,872 256,283 239,879
Unearned shares (in shares) 0 0 0
Total ESOP shares (in shares) 262,872 256,283 239,879
Fair value of unearned shares $ 0 $ 0 $ 0
Contribution expense to profit sharing plan included in compensation and benefits $ 1,260,000 $ 1,100,000 $ 900,000