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SECURITIES - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Item Effected [Line Items]
Investment securities transferred from HTM to AFS	$ (226,618)	$ (449,840)
Mortgage-backed securities transferred from HTM to AFS	(8,393)	(113,689)
AFS Investment securities transferred from HTM	1,418,862	1,106,977
AFS Mortgage-backed securities transferred from HTM	654,890	$ 586,454
Accounting Standards Update 2017-12 [Member]
Item Effected [Line Items]
Investment securities transferred from HTM to AFS	204,700
Mortgage-backed securities transferred from HTM to AFS	101,300
AFS Investment securities transferred from HTM	204,700
AFS Mortgage-backed securities transferred from HTM	$ 101,300

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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