LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Financing Receivable, Nonaccrual [Line Items]
Total gross loans and leases	$ 4,743,324	$ 4,075,195
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,281
2024	4,344	4,748
2023	16,627	5,435
2022	11,286	1,487
2021	17,044	1,369
Prior	976	4,063
Revolving Loans and Leases	11,247	29
Total gross loans and leases	61,524	26,412
Nonaccrual with No ACL	23,231	3,260
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,281
2024	807	3,433
2023	13,395	5,369
2022	11,286	1,386
2021	13,537	625
Prior	192	3,368
Revolving Loans and Leases	0	0
Total gross loans and leases	39,217	23,462
Nonaccrual with No ACL	19,152	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	9,517
Total gross loans and leases	9,517
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	1,730	29
Total gross loans and leases	1,730	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	150	11
2022	0	46
2021	3,480	2
Prior	656	110
Revolving Loans and Leases	0	0
Total gross loans and leases	4,286	746
Nonaccrual with No ACL	4,079	0
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	3,537	738
2023	3,082	55
2022	0	55
2021	27	742
Prior	128	585
Revolving Loans and Leases	0	0
Total gross loans and leases	6,774	2,175
Nonaccrual with No ACL	0	681
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2025	0	9,281
2024	4,344	4,748
2023	16,627	5,435
2022	11,286	1,487
2021	17,044	1,369
Prior	976	4,063
Revolving Loans and Leases	11,247	29
Total gross loans and leases	61,524	26,412
Nonaccrual with No ACL	23,231	3,260
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2025	4,625	10,500
2024	3,256	2,481
2023	912	1,073
2022	946	809
2021	32	275
Prior	1	12
Revolving Loans and Leases	0	0
Total gross loans and leases	9,772	15,150
90 or More Days Delinquent and Accruing \| Total loans and leases held for investment
Financing Receivable, Nonaccrual [Line Items]
2025	4,625	9,469
2024	3,256	2,462
2023	912	1,073
2022	946	809
2021	32	275
Prior	1	12
Revolving Loans and Leases	0	0
Total gross loans and leases	9,772	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	187	719
2021	0	217
Prior	1	12
Revolving Loans and Leases	0	0
Total gross loans and leases	188	1,923
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	100	0
2023	149	0
2022	669	2
2021	0	58
Prior	0	0
Revolving Loans and Leases	0	0
Total gross loans and leases	918	60
90 or More Days Delinquent and Accruing \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	2,264	0
2023	0	331
2022	0	0
2021	0	0
Prior	0	0
Revolving Loans and Leases	0	0
Total gross loans and leases	2,264	331
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2025	0	0
2024	2,364	621
2023	149	685
2022	856	721
2021	0	275
Prior	1	12
Revolving Loans and Leases	0	0
Total gross loans and leases	3,370	2,314
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2025	4,625	736
2024	892	1,841
2023	763	388
2022	90	88
2021	32	0
Prior	0	0
Revolving Loans and Leases	0	0
Total gross loans and leases	$ 6,402	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.

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