LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022
Loans and Leases Receivable Disclosure [Abstract]
Minimum lease payments receivable	$ 191,807	$ 216,880
Unguaranteed residual assets	12,709	13,037
Unamortized initial direct costs	141	295
Unearned income	(21,124)	(19,225)
Total net investment in direct financing and sales-type leases	183,533	210,987
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	13,536	17,081
Lease income from operating lease payments	53,551	46,017
Other	3,964	5,982
Total leasing and equipment finance noninterest income	57,515	51,999
Total lease income	71,051	$ 69,080
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2024	76,899
2025	47,205
2026	25,478
2027	16,300
2028	13,378
Thereafter	12,547
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	191,807
Third-party residual value guarantees	0
Total carrying amount of direct financing and sales-type leases	$ 191,807

Direct Financing Lease, Unamortized Initial Direct Costs

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Leasing and Equipment Finance, Other, Non-interest Income

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Amount of deferred selling profit from direct financing lease.

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-SubTopic 30
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-Section 50
-Paragraph 6
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Amount excluding accrued interest, before allowance for credit loss, of net investment in direct financing lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 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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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 cash flows to be received by lessor for sales-type and direct financing leases in second 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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Present value expected to be derived from underlying asset following end of lease term not guaranteed by lessee or other third party unrelated to lessor.

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