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SECURITIES - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Item Effected [Line Items]
Investment securities transferred from HTM to AFS	$ (216,160)	$ (449,840)
Mortgage-backed securities transferred from HTM to AFS	(8,218)	(113,689)
AFS Investment securities transferred from HTM	1,351,538	1,106,977
AFS Mortgage-backed securities transferred from HTM	575,999	$ 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 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
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-SubTopic 10
-Section 45
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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