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SECURITIES - Activities Related to Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Available For Sale |  |  |  |
Proceeds from sales | $ 260,000 | $ 755,616 | $ 596,758 | $ 457,306
Gross gains on sales |  | 6,006 | 2,551 | 4,091
Gross losses on sales |  | 5,277 | 10,728 | 4,628
Net gain (loss) on available for sale securities |  | 729 | (8,177) | (537)
Held To Maturity |  |  |  |
Net carrying amount of securities sold |  | 0 | 0 | 5,826
Gross realized gain on sales |  | 0 | 0 | 92
Gross realized losses on sales |  | 0 | 0 | 48
Net gain on held to maturity securities |  | $ 0 | $ 0 | $ 44

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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