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ACQUISTIONS - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
ACQUISTIONS - Narrative (Details) - USD ($) $ in Thousands	Aug. 01, 2018	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Goodwill		$ 307,464	$ 303,270	$ 98,723	$ 98,723
Crestmark Bancorp, Inc.
Business Acquisition [Line Items]
Total consideration paid	$ 295,800
Equity interest issued (in shares)	9,919,512
Receivables acquired		591,100
Goodwill	$ 204,547	208,742
DC Solar
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)		$ 2,200