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INVESTMENT SECURITIES (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]    
Securities pledged to secure public deposits, fair value $ 22,600 $ 30,900
Sales of securities from the available-for-sale 6,100
Sales from the held-to-maturity
Net gain on sales of investment securities $ 68