LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Loans and Leases Receivable Disclosure [Abstract]
Minimum lease payments receivable	$ 157,271	$ 162,757
Unguaranteed residual assets	6,785	9,300
Unamortized initial direct costs	68	102
Unearned income	(14,820)	(19,883)
Total net investment in direct financing and sales-type leases	149,304	152,276
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	11,185	11,827	$ 13,536
Lease income from operating lease payments	50,750	53,365	53,551
Other	8,441	4,921	3,964
Total leasing and equipment finance noninterest income	59,191	58,286	57,515
Total lease income	70,376	$ 70,113	$ 71,051
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
2026	50,195
2027	60,916
2028	22,911
2029	15,108
2030	6,489
Thereafter	1,652
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	157,271
Third-party residual value guarantees	0
Total carrying amount of minimum lease payments for direct financing and sales-type leases	$ 157,271

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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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 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 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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