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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Assets of VIE's) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 99,977	$ 1,267,586	$ 773,830	$ 27,658
Loans and leases receivable	2,944,739	1,325,371
Allowance for loan and lease losses	(13,040)	(7,534)
Accrued interest receivable	22,016	19,380
Foreclosed real estate and repossessed assets	31,638	292
Other assets	30,879	12,738
Total assets	5,835,067	5,228,332	$ 4,006,419
Accrued expenses and other liabilities	133,838	78,065
Non-controlling interest	3,574	$ 0
VIE's Aggregated Disclosure [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	867
Loans and leases receivable	131,197
Allowance for loan and lease losses	(145)
Accrued interest receivable	887
Rental equipment	99
Foreclosed real estate and repossessed assets	1,626
Other assets	3,247
Total assets	137,778
Accrued expenses and other liabilities	2,386
Non-controlling interest	3,574
Net assets less non-controlling interest	$ 131,818