LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Net Investment in Lease [Abstract]
Carrying amount	$ 255,907		$ 278,341
Unguaranteed residual assets	13,329		14,393
Unamortized initial direct costs	435		490
Unearned income	(23,921)		(26,684)
Total net investment in direct financing and sales-type leases	245,750		$ 266,540
Operating Lease, Lease Income [Abstract]
Interest income on net investments in direct financing and sales-type leases	4,573	$ 5,319
Lease income from operating lease payments	11,086	10,041
Profit recorded on commencement date on sales-type leases	0	71
Other	1,325	69
Total leasing and equipment finance noninterest income	12,411	10,181
Total lease income	16,984	$ 15,500
Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract]
Remaining in 2022	78,421
2023	86,354
2024	54,978
2025	26,113
2026	7,124
Thereafter	2,918
Total undiscounted future minimum lease payments receivable for direct financing and sales-type leases	255,908
Total carrying amount of direct financing and sales-type leases	$ 255,908

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Leasing and Equipment Finance, Non-interest Income

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Amount of deferred selling profit from 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 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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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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