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LOANS RECEIVABLE, NET - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Loans without specific valuation allowance [Abstract]    
Recorded balance $ 1,181 $ 517
Unpaid principal balance 1,181 517
Loans with a specific valuation allowance [Abstract]    
Recorded balance 0 78
Unpaid principal balance 0 78
Specific allowance 0 10
Average recorded investment in impaired loans 1,675 4,186
1-4 Family Real Estate [Member]    
Loans without specific valuation allowance [Abstract]    
Recorded balance 72 84
Unpaid principal balance 72 84
Loans with a specific valuation allowance [Abstract]    
Recorded balance   78
Unpaid principal balance   78
Specific allowance   10
Average recorded investment in impaired loans 176 144
Commercial and Multi-Family Real Estate [Member]    
Loans without specific valuation allowance [Abstract]    
Recorded balance 1,109 433
Unpaid principal balance 1,109 433
Loans with a specific valuation allowance [Abstract]    
Average recorded investment in impaired loans 883 1,117
Agricultural Real Estate [Member]    
Loans with a specific valuation allowance [Abstract]    
Average recorded investment in impaired loans 146 0
Commercial Operating [Member]    
Loans with a specific valuation allowance [Abstract]    
Average recorded investment in impaired loans 202 6
Agricultural Operating [Member]    
Loans with a specific valuation allowance [Abstract]    
Average recorded investment in impaired loans $ 268 $ 2,919