LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Nonaccrual [Line Items]
Total gross loans and leases	$ 4,562,681	$ 4,075,195
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,281
2024	5,456	4,748
2023	8,004	5,435
2022	4,793	1,487
2021	2,578	1,369
Prior	5,236	4,063
Revolving Loans and Leases	1,164	29
Total gross loans and leases	27,231	26,412
Nonaccrual with No ACL	6,552	3,260
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,281
2024	5,456	3,433
2023	6,958	5,369
2022	4,703	1,386
2021	1,200	625
Prior	3,909	3,368
Revolving Loans and Leases	0	0
Total gross loans and leases	22,226	23,462
Nonaccrual with No ACL	6,552	2,579
Nonaccrual Loans \| National Lending \| Asset-based lending
Financing Receivable, Nonaccrual [Line Items]
2025	0
2024	0
2023	0
2022	0
2021	0
Prior	0
Revolving Loans and Leases	603
Total gross loans and leases	603
Nonaccrual with No ACL	0
Nonaccrual Loans \| National Lending \| Factoring
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving Loans and Leases	561	29
Total gross loans and leases	561	29
Nonaccrual with No ACL	0	0
Nonaccrual Loans \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	0	577
2023	533	11
2022	0	46
2021	1,323	2
Prior	182	110
Revolving Loans and Leases	0	0
Total gross loans and leases	2,038	746
Nonaccrual with No ACL	0	0
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	0	738
2023	513	55
2022	90	55
2021	55	742
Prior	1,145	585
Revolving Loans and Leases	0	0
Total gross loans and leases	1,803	2,175
Nonaccrual with No ACL	0	681
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,281
2024	5,456	4,748
2023	8,004	5,435
2022	4,793	1,487
2021	2,578	1,369
Prior	5,236	4,063
Revolving Loans and Leases	1,164	29
Total gross loans and leases	27,231	26,412
Nonaccrual with No ACL	6,552	3,260
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2025	0	10,500
2024	1,031	2,481
2023	1,236	1,073
2022	1,080	809
2021	4,627	275
Prior	4	12
Revolving Loans and Leases	0	0
Total gross loans and leases	7,978	15,150
90 or More Days Delinquent and Accruing \| Total loans and leases held for investment
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,469
2024	1,031	2,462
2023	1,236	1,073
2022	1,080	809
2021	4,627	275
Prior	4	12
Revolving Loans and Leases	0	0
Total gross loans and leases	7,978	14,100
90 or More Days Delinquent and Accruing \| National Lending \| Loans held for sale
Financing Receivable, Nonaccrual [Line Items]
2025		1,031
2024		19
2023		0
2022		0
2021		0
Prior		0
Revolving Loans and Leases		0
Total gross loans and leases		1,050
90 or More Days Delinquent and Accruing \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	0	621
2023	0	354
2022	560	719
2021	4,448	217
Prior	2	12
Revolving Loans and Leases	0	0
Total gross loans and leases	5,010	1,923
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	55	0
2023	1	0
2022	0	2
2021	1	58
Prior	2	0
Revolving Loans and Leases	0	0
Total gross loans and leases	59	60
90 or More Days Delinquent and Accruing \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	0	0
2023	0	331
2022	330	0
2021	156	0
Prior	0	0
Revolving Loans and Leases	0	0
Total gross loans and leases	486	331
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	55	621
2023	1	685
2022	890	721
2021	4,605	275
Prior	4	12
Revolving Loans and Leases	0	0
Total gross loans and leases	5,555	2,314
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2025	0	736
2024	976	1,841
2023	1,235	388
2022	190	88
2021	22	0
Prior	0	0
Revolving Loans and Leases	0	0
Total gross loans and leases	$ 2,423	3,053
90 or More Days Delinquent and Accruing \| National Lending \| Tax services
Financing Receivable, Nonaccrual [Line Items]
2025		8,733
2024		0
2023		0
2022		0
2021		0
Prior		0
Revolving Loans and Leases		0
Total gross loans and leases		$ 8,733

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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