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SECURITIES - Activities Related to Sale (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Available For Sale |  |  |
Proceeds from sales | $ 50,468 | $ 4,904 | $ 755,616
Gross gains on sales | 179 | 51 | 6,006
Gross losses on sales | 173 | 0 | 5,277
Net gain (loss) on securities AFS | $ 6 | $ 51 | $ 729

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