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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Net Investment in Lease [Abstract]
Minimum lease payments receivable	$ 164,458		$ 164,458		$ 191,807
Unguaranteed residual assets	10,442		10,442		12,709
Unamortized initial direct costs	62		62		141
Unearned income	(19,846)		(19,846)		(21,124)
Total net investment in direct financing and sales-type leases	155,116		155,116		$ 183,533
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	2,908	$ 2,858	8,869	$ 8,821
Lease income from operating lease payments	13,589	13,780	40,449	39,176
Other	1,051	833	2,644	1,179
Total leasing and equipment finance noninterest income	14,640	14,613	43,093	40,355
Total lease income	17,548	$ 17,471	51,962	$ 49,176
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remaining in 2024	17,056		17,056
2025	54,962		54,962
2026	36,939		36,939
2027	22,897		22,897
2028	17,622		17,622
Thereafter	14,982		14,982
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	164,458		164,458
Third-party residual value guarantees	0		0
Total carrying amount of direct financing and sales-type leases	$ 164,458		$ 164,458

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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