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EMPLOYEE STOCK OWNERSHIP AND PROFIT SHARING PLANS (Details) - USD ($)
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
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 $ 994,000 $ 703,000 $ 694,000
Contribution to ESOP $ 992,038 $ 850,406 $ 485,548
Percentage of benefits vested after credited service 100.00%    
Years of credited service 7 years    
Number of shares (ESOP) released (in shares) 23,750 24,125 17,715
Fair value of shares (ESOP) released (in dollars per share) $ 41.77 $ 35.25 $ 37.99
Allocated and total ESOP shares withdrawn from ESOP by participant no longer with the company (in shares) 10,294 10,643 45,225
Shares purchased for dividend reinvestment (in shares) 2,974 2,529 3,526
Year-end ESOP shares [Abstract]      
Allocated shares (in shares) 256,283 239,879 223,868
Unearned shares (in shares) 0 0 0
Total ESOP shares (in shares) 256,283 239,879 223,868
Fair value of unearned shares $ 0 $ 0 $ 0
Contribution expense to profit sharing plan included in compensation and benefits $ 1,100,000 $ 900,000 $ 800,000