LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Loans and Leases Receivable Disclosure [Abstract]
Carrying amount	$ 278,341	$ 299,487
Unguaranteed residual assets	14,393	17,203
Unamortized initial direct costs	490	2,078
Unearned income	(26,684)	(35,606)
Total net investment in direct financing and sales-type leases	266,540	283,162
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	22,876	18,300
Lease income from operating lease payments	39,553	44,319
Profit (loss) recorded on commencement date on sales-type leases	337	2,152
Other	4,986	4,357
Total leasing and equipment finance noninterest income	44,876	50,828
Total lease income	67,752	$ 69,128
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2022	109,680
2023	83,438
2024	51,901
2025	24,838
2026	5,941
Thereafter	2,543
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	278,341
Total carrying amount of direct financing and sales-type leases	$ 278,341

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Leasing and Equipment Finance, Non-interest Income

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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, before allowance for credit loss, of net investment in sales-type and direct financing leases.

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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 undiscounted cash flows to be received by lessor for 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 fifth 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 cash flows to be received by lessor for sales-type and direct financing leases in next 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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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 lease.

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