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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 21,729 | $ 20,763 | $ 20,629 | $ 18,275 | $ 16,363 | $ 15,254 | $ 15,758 | $ 14,232 | $ 12,869 | $ 12,566 | $ 12,063 | $ 11,162 |  |  |
Interest expense | 1,836 | 844 | 691 | 720 | 660 | 593 | 473 | 661 | 567 | 638 | 544 | 649 | $ 4,091 | $ 2,387 | $ 2,398
Net interest income | 19,893 | 19,919 | 19,938 | 17,555 | 15,703 | 14,661 | 15,285 | 13,571 | 12,302 | 11,928 | 11,519 | 10,513 | 77,305 | 59,220 | 46,262
Provision (recovery) for loan losses | 548 | 2,098 | 1,173 | 786 | 124 | 700 | 593 | 48 | 550 | 300 | 300 | 0 | 4,605 | 1,465 | 1,150
Net Income (loss) | $ 6,006 | $ 8,873 | $ 14,283 | $ 4,058 | $ 4,639 | $ 4,640 | $ 5,181 | $ 3,595 | $ 3,363 | $ 4,204 | $ 4,144 | $ 4,002 | $ 33,220 | $ 18,055 | $ 15,713
Earnings (loss) per common and common equivalent share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.71 | $ 1.05 | $ 1.69 | $ 0.49 | $ 0.64 | $ 0.67 | $ 0.79 | $ 0.58 | $ 0.54 | $ 0.69 | $ 0.68 | $ 0.66 | $ 3.95 | $ 2.68 | $ 2.57
Diluted (in dollars per share) | 0.70 | 1.04 | 1.68 | 0.49 | 0.64 | 0.66 | 0.78 | 0.58 | 0.53 | 0.68 | 0.67 | 0.65 | $ 3.92 | $ 2.66 | $ 2.53
Dividend declared per share (in dollars per share) | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 |  |  |

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