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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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