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SECURITIES - Activities Related to Sale (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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