LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Net Investment in Lease [Abstract]
Minimum lease payments receivable	$ 131,981		$ 131,981		$ 157,271
Unguaranteed residual assets	6,391		6,391		6,785
Unamortized initial direct costs	44		44		68
Unearned income	(11,470)		(11,470)		(14,820)
Total net investment in direct financing and sales-type leases	126,946		126,946		$ 149,304
Interest income - loans and leases
Interest income on net investments in direct financing and sales-type leases	1,973	$ 2,800	3,921	$ 5,987
Lease income from operating lease payments	10,608	12,930	21,892	26,379
Other	1,962	1,139	3,545	2,446
Total leasing and equipment finance noninterest income	12,570	14,069	25,437	28,825
Total lease income	14,543	$ 16,869	29,358	$ 34,812
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remaining in 2026	24,553		24,553
2027	61,933		61,933
2028	24,672		24,672
2029	13,245		13,245
2030	5,752		5,752
Thereafter	1,826		1,826
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	131,981		131,981
Third-party residual value guarantees	0		0
Total carrying amount of minimum lease payments for direct financing and sales-type leases	$ 131,981		$ 131,981

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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