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FORECLOSED REAL ESTATE AND REPOSSESSED ASSETS - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Real Estate [Line Items]    
Valuation allowance for repossessed assets $ 500,000 $ 100,000
Foreclosed Property    
Real Estate [Line Items]    
Gain (loss) on sale (4,960,000) 15,000
Community Bank    
Real Estate [Line Items]    
Loans and leases in the process of foreclosure 0 $ 0
Agricultural Operating Loans | Agriculture Real Estate Customer    
Real Estate [Line Items]    
Other real estate owned sold 28,100,000  
Gain (loss) on sale (5,039,000)  
Deferred rental income 1,096,000  
OREO expenses 200,000  
Agricultural Operating Loans | Foreclosed Property    
Real Estate [Line Items]    
Gain (loss) on sale (5,000,000.0)  
Agricultural Operating Loans | Foreclosed Property | Community Bank    
Real Estate [Line Items]    
Deferred rental income $ 1,100,000