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INVESTMENT SECURITIES (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]    
Sales of investment securities available for sale $ 6,298
Realized gain on sale of securities available for sale 72
Securities pledged to secure public deposits, fair value $ 21,800 $ 27,800