LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Net Investment in Lease [Abstract]
Minimum lease payments receivable	$ 197,829		$ 191,807
Unguaranteed residual assets	14,388		12,709
Unamortized initial direct costs	114		141
Unearned income	(23,181)		(21,124)
Total net investment in direct financing and sales-type leases	189,150		$ 183,533
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	3,108	$ 3,143
Lease income from operating lease payments	13,255	12,554
Other	724	702
Total leasing and equipment finance noninterest income	13,979	13,256
Total lease income	17,087	$ 16,399
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remaining in 2024	60,302
2025	54,431
2026	33,348
2027	20,287
2028	15,912
Thereafter	13,549
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	197,829
Third-party residual value guarantees	0
Total carrying amount of direct financing and sales-type leases	$ 197,829

Direct Financing Lease, Unamortized Initial Direct Costs

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Leasing and Equipment Finance, Other, Non-interest Income

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Leasing and Equipment Finance, Non-interest Income

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Sales-Type And Direct Financing Leases, Lease Receivable, To Be Received, After Year Four

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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 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 in remainder of 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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