LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2019	Sep. 30, 2019
Net Investment in Lease [Abstract]
Carrying Amount	$ 239,351	$ 191,733
Unguaranteed residual assets	16,260	13,353
Unamortized initial direct costs	1,856	1,790
Unearned income	(31,896)	(27,171)
Total net investment in direct financing and sales-type leases	225,571	$ 179,705
Operating Lease, Lease Income [Abstract]
Interest income on net investments in direct financing and sales-type leases	4,087
Lease income from operating lease payments	11,203
Profit (loss) recorded on commencement date on sales-type leases	471
Other	750
Total leasing and equipment finance non-interest income	12,424
Total lease income	16,511
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2020	66,919
2021	70,629
2022	50,676
2023	29,908
2024	16,795
Thereafter	4,414
Equipment under leases not yet commenced	10
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	239,351
Third-party residual value guarantees	0
Total carrying amount of direct financing and sales-type leases	$ 239,351

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