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SECURITIES - Narrative (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]      
Securities pledged as collateral for public funds on deposit $ 0 $ 21,900,000  
Securities pledged as collateral for individual, trust, and estate deposits 0 4,800,000  
Equity securities without readily determinable fair value, amount 11,000,000.0 6,500,000  
Federal Reserve Bank and Federal Home Loan Bank stocks, at cost 7,500,000 30,900,000  
Pledged securities against specific FHLB advances, fair value 673,800,000 812,200,000  
Loans pledged as collateral 333,800,000 928,800,000  
Federal reserve bank stock 19,700,000    
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Investments 359,700,000    
Federal Home Loan Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB 800,000 $ 1,000,000.0 $ 1,100,000
Federal Reserve Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB $ 300,000