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SECURITIES - Activities Related to Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Available For Sale      
Proceeds from sales $ 4,904 $ 755,616 $ 596,758
Gross gains on sales 51 6,006 2,551
Gross losses on sales 0 5,277 10,728
Net gain (loss) on securities AFS $ 51 $ 729 $ (8,177)