LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Carrying amount	$ 216,880	$ 278,341
Unguaranteed residual assets	13,037	14,393
Unamortized initial direct costs	295	490
Unearned income	(19,225)	(26,684)
Total net investment in direct financing and sales-type leases	210,987	266,540
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	17,081	22,876
Lease income from operating lease payments	46,017	39,553
Profit recorded on commencement date on sales-type leases	0	337
Other	5,982	4,986
Total leasing and equipment finance noninterest income	51,999	44,876
Total lease income	69,080	$ 67,752
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2023	95,608
2024	66,344
2025	34,657
2026	12,714
2027	5,495
Thereafter	2,062
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	216,880
Third-party residual value guarantees	0
Total carrying amount of direct financing and sales-type leases	$ 216,880

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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 deferred selling profit from direct financing lease.

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Amount excluding accrued interest, before allowance for credit loss, of net investment in direct financing lease.

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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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Amount of interest income from net investment in 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.

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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 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 cash flows to be received by lessor for sales-type and direct financing leases after 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 third 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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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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Amount of profit (loss) recognized at commencement from sales-type lease.

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