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FORECLOSURED REAL ESTATE AND REPOSSESSED ASSETS - Other Real Estate Owned (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Real Estate [Line Items]      
TDR valuation allowance $ 1,000,000.0   $ 500,000
Community Bank      
Real Estate [Line Items]      
Loans in process of foreclosure, amount 0   0
Agriculture Real Estate Customer | Agricultural real estate and operating      
Real Estate [Line Items]      
Revenue recognized in deferred rental income     1,100,000
OREO expenses     200,000
Foreclosed Property      
Real Estate [Line Items]      
Other real estate owned sold 8,483,000 $ 28,228,000 28,100,000
Gain (loss) on sale $ 4,000 $ (5,039,000) $ (5,000,000.0)