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FORECLOSURED REAL ESTATE AND REPOSSESSED ASSETS - Other Real Estate Owned (Details) - USD ($)
9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Real Estate [Line Items]        
TDR valuation allowance $ 500,000   $ 100,000  
Community Banking        
Real Estate [Line Items]        
Loans in process of foreclosure, amount     0  
Agriculture Real Estate Customer | Agricultural real estate and operating        
Real Estate [Line Items]        
Other real estate sold in the period 28,100,000      
Purchase price 23,083,000      
Carrying value of OREO 28,122,000      
Loss on sale (5,039,000)      
Deferred income recognized 1,096,000      
Net impact (3,943,000)      
OREO expenses 200,000      
Foreclosed Property        
Real Estate [Line Items]        
Purchase price 23,086,000 $ 1,905,000    
Carrying value of OREO 6,784,000 29,514,000 $ 29,494,000 $ 31,638,000
Loss on sale 5,039,000 $ (15,000)    
Foreclosed Property | Agricultural real estate and operating        
Real Estate [Line Items]        
Loss on sale (5,000,000.0)      
Foreclosed Property | Agricultural real estate and operating | Community Banking        
Real Estate [Line Items]        
Deferred income recognized $ 1,100,000