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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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