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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Net Investment in Lease [Abstract]
Minimum lease payments receivable	$ 144,134		$ 144,134		$ 162,757
Unguaranteed residual assets	7,284		7,284		9,300
Unamortized initial direct costs	72		72		102
Unearned income	(17,204)		(17,204)		(19,883)
Total net investment in direct financing and sales-type leases	134,286		134,286		$ 152,276
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	2,444	$ 2,908	8,431	$ 8,869
Lease income from operating lease payments	12,751	13,589	39,130	40,449
Other	747	1,051	3,193	2,644
Total leasing and equipment finance noninterest income	13,498	14,640	42,323	43,093
Total lease income	15,942	$ 17,548	50,754	$ 51,962
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remaining in 2025	15,714		15,714
2026	49,550		49,550
2027	35,162		35,162
2028	22,288		22,288
2029	13,579		13,579
Thereafter	7,841		7,841
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	144,134		144,134
Third-party residual value guarantees	0		0
Total carrying amount of minimum lease payments for direct financing and sales-type leases	$ 144,134		$ 144,134

Direct Financing Lease, Unamortized Initial Direct Costs

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Leasing and Equipment Finance, Other, 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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