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FORECLOSED REAL ESTATE AND REPOSSESSED ASSETS - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Real Estate [Line Items]    
Valuation allowance for repossessed assets $ 1,100,000 $ 500,000
Other real estate owned sold   28,100,000
Foreclosed Property    
Real Estate [Line Items]    
Other real estate owned sold 8,952,000 23,992,000
Loss on sale 4,000 (4,960,000)
Agriculture Real Estate Customer | Agricultural Operating Loans    
Real Estate [Line Items]    
Deferred rental income   1,100,000
OREO expenses   200,000
Community Bank    
Real Estate [Line Items]    
Loans and leases in the process of foreclosure $ 0 $ 0