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FORECLOSURED REAL ESTATE AND REPOSSESSED ASSETS - Other Real Estate Owned (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Real Estate [Line Items]    
TDR valuation allowance $ 500,000 $ 600,000
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