LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Net Investment in Lease [Abstract]
Carrying Amount	$ 283,003	$ 283,003	$ 191,733
Unguaranteed residual assets	16,662	16,662	13,353
Unamortized initial direct costs	1,967	1,967	1,790
Unearned income	(34,677)	(34,677)	(27,171)
Total net investment in direct financing and sales-type leases	266,955	266,955	$ 179,705
Operating Lease, Lease Income [Abstract]
Interest income on net investments in direct financing and sales-type leases	4,496	12,958
Lease income from operating lease payments	11,391	33,857
Profit (loss) recorded on commencement date on sales-type leases	103	590
Other	554	3,135
Total leasing and equipment finance noninterest income	12,048	37,582
Total lease income	16,544	50,540
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remaining in 2020	25,308	25,308
2021	95,008	95,008
2022	74,899	74,899
2023	49,197	49,197
2024	29,178	29,178
Thereafter	9,413	9,413
Equipment under leases not yet commenced
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	283,003	283,003
Third-party residual value guarantees	0	0
Total carrying amount of direct financing and sales-type leases	$ 283,003	$ 283,003

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Leasing and Equipment Finance, Non-interest Income

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

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Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

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Amount of residual asset covered by residual value guarantee. Excludes guarantee considered to be lease payments for lessor.

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Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases.

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Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of undiscounted lease receivable in excess of discounted receivable for sales-type and direct financing leases.

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