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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.