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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 60,202 | $ 34,104 | $ 33,371 | $ 30,857 | $ 28,949 | $ 28,861 | $ 27,718 | $ 22,575 | $ 21,729 | $ 20,763 | $ 20,629 | $ 18,275 |  |  |  |  |  |
Interest expense | 11,665 | 5,693 | 5,966 | 4,661 | 4,461 | 3,918 | 3,752 | 2,742 | 1,836 | 844 | 691 | 720 | $ 27,985 |  | $ 14,873 |  | $ 4,091 |
Net interest income | 48,537 | 28,411 | 27,405 | 26,196 | 24,488 | 24,943 | 23,966 | 19,833 | 19,893 | 19,919 | 19,938 | 17,555 | 130,549 |  | 93,230 |  | 77,305 |
Provision for loan and lease losses | 4,706 | 5,315 | 18,343 | 1,068 | (144) | 1,240 | 8,649 | 843 | 548 | 2,098 | 1,173 | 786 | 29,432 |  | 10,589 |  | 4,605 |
Noninterest Income | 24,613 | 33,225 | 97,419 | 29,268 | 29,833 | 30,820 | 92,170 | 19,349 | 19,228 | 23,807 | 40,901 | 16,834 | 184,525 |  | 172,172 |  | 100,770 |
Net Income attributable to parent | $ 8,722 | $ 6,792 | $ 31,436 | $ 4,670 | $ 1,744 | $ 9,787 | $ 32,142 | $ 1,244 | $ 6,006 | $ 8,873 | $ 14,283 | $ 4,058 | $ 51,620 |  | $ 44,917 |  | $ 33,220 |
Earnings (loss) per common and common equivalent share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.24 | $ 0.22 | $ 1.07 | $ 0.15 | $ 0.07 | $ 0.35 | $ 1.15 | $ 0.05 | $ 0.23 | $ 0.35 | $ 0.57 | $ 0.16 | $ 1.68 | [1] | $ 1.62 | [1] | $ 1.31 | [1]
Diluted (in dollars per share) | 0.24 | 0.22 | 1.06 | 0.15 | 0.07 | 0.35 | 1.14 | 0.05 | 0.23 | 0.35 | 0.56 | 0.16 | $ 1.67 | [1] | $ 1.61 | [1] | $ 1.30 | [1]
Dividend declared per share (in dollars per share) | $ 0.05 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 |  |  |  |  |  |
[1] | All share and per share data for all periods presented has been adjusted to reflect the 3-for-1 forward stock split of the Company's common stock effected by the Company on October 4, 2018.

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