ACQUISITIONS ACQUISITONS - Proforma Information (Details) - Crestmark Bancorp, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Net interest income	$ 206,822	$ 181,184
Net income attributable to parent	$ 74,640	$ 64,390
Basic earnings per share (in dollars per share)	$ 1.91	$ 1.71
Diluted earnings per share (in dollars per share)	$ 1.91	$ 1.70