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SECURITIES - Narrative (Details) - USD ($)
6 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]    
Equity Securities without readily determinable fair value, amount $ 10,500,000 $ 6,500,000
Federal Home Loan Bank Stock, at cost 29,944,000 $ 30,916,000
Impairment recognized $ 0