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CREDIT DISCLSOURES - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Loans without a specific valuation allowance          
Recorded Balance $ 3,878   $ 3,878   $ 1,181
Unpaid Principal Balance 3,878   3,878   1,181
Loans with a specific valuation allowance [Abstract]          
Recorded investment 135   135    
Unpaid principal balance 135   135    
Specific allowance 25   25    
Average Recorded Investment 2,614 $ 1,866 2,020 $ 1,319  
1-4 Family Real Estate [Member]          
Loans without a specific valuation allowance          
Recorded Balance 95   95   72
Unpaid Principal Balance 95   95   72
Loans with a specific valuation allowance [Abstract]          
Recorded investment 135   135    
Unpaid principal balance 135   135    
Specific allowance 25   25    
Average Recorded Investment 140 210 110 191  
Commercial and Multi-Family Real Estate [Member]          
Loans without a specific valuation allowance          
Recorded Balance 702   702   1,109
Unpaid Principal Balance 702   702   $ 1,109
Loans with a specific valuation allowance [Abstract]          
Average Recorded Investment 705 668 840 550  
Agricultural Real Estate [Member]          
Loans with a specific valuation allowance [Abstract]          
Average Recorded Investment 0 194 0 97  
Consumer [Member]          
Loans without a specific valuation allowance          
Recorded Balance 144   144    
Unpaid Principal Balance 144   144    
Loans with a specific valuation allowance [Abstract]          
Average Recorded Investment 89 0 55 0  
Commercial Operating [Member]          
Loans with a specific valuation allowance [Abstract]          
Average Recorded Investment 0 437 0 302  
Agricultural Operating [Member]          
Loans without a specific valuation allowance          
Recorded Balance 2,937   2,937    
Unpaid Principal Balance 2,937   2,937    
Loans with a specific valuation allowance [Abstract]          
Average Recorded Investment $ 1,680 $ 357 $ 1,015 $ 179