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RECENT ACCOUNTING PRONOUNCEMENTS (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 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 |

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