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RECENT ACCOUNTING PRONOUNCEMENTS (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |
Reclassified mortgage-backed seurities | $ 12,619 | $ 12,619 |
Reclassified adjustment from AOCI to retained earnings | $ 188,000 | $ 188,000 |

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