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SECURITIES - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
Item Effected [Line Items] |  |  |
Equity securities cost | $ 1,800,000 |  |
Equity securities fair value | 1,900,000 |  |
Equity Securities without readily determinable fair value, amount | 2,500,000 |  | $ 2,000,000.0
Federal Home Loan Bank Stock, at cost | 17,236,000 |  | $ 23,400,000
Impairment recognized | $ 0 |  |
Accounting Standards Update 2016-01 | Retained Earnings |  |  |
Item Effected [Line Items] |  |  |
Adoption of accounting standards update |  | $ 475,000 |

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