LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Financing Receivable, Nonaccrual [Line Items]
Loans and leases	$ 4,409,385	$ 4,366,116
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2024	1,121	865
2023	3,990	5,692
2022	7,588	3,379
2021	2,762	2,825
2020	3,146	3,134
Prior	4,594	2,097
Revolving Loans and Leases	4,580	19,380
Loans and leases	27,781	37,372
Nonaccrual with No ACL	1,289	1
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2024	1,121	865
2023	2,683	4,942
2022	7,414	2,933
2021	2,222	2,165
2020	1,446	3,134
Prior	4,074	1,285
Revolving Loans and Leases	0	0
Loans and leases	18,960	15,324
Nonaccrual with No ACL	0	0
Nonaccrual Loans \| National Lending \| Asset-based lending
Financing Receivable, Nonaccrual [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving Loans and Leases		18,082
Loans and leases		18,082
Nonaccrual with No ACL		0
Nonaccrual Loans \| National Lending \| Factoring
Financing Receivable, Nonaccrual [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans and Leases	4,580	1,298
Loans and leases	4,580	1,298
Nonaccrual with No ACL	0	0
Nonaccrual Loans \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2024	0	0
2023	0	0
2022	95	446
2021	540	660
2020	695	0
Prior	275	560
Revolving Loans and Leases	0	0
Loans and leases	1,605	1,666
Nonaccrual with No ACL	539	1
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2024	0	0
2023	1,307	750
2022	79	0
2021	0	0
2020	1,005	0
Prior	245	252
Revolving Loans and Leases	0	0
Loans and leases	2,636	1,002
Nonaccrual with No ACL	750	0
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2024	1,121	865
2023	3,990	5,692
2022	7,588	3,379
2021	2,762	2,825
2020	3,146	3,134
Prior	4,594	2,097
Revolving Loans and Leases	4,580	19,380
Loans and leases	27,781	37,372
Nonaccrual with No ACL	1,289	1
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2024	861	8,034
2023	3,957	3,320
2022	716	1,839
2021	550	1,850
2020	256	2,157
Prior	275	1,612
Revolving Loans and Leases	0	28
Loans and leases	6,615	18,840
90 or More Days Delinquent and Accruing \| Total loans and leases held for investment
Financing Receivable, Nonaccrual [Line Items]
2024	861	7,728
2023	3,114	3,320
2022	716	1,839
2021	550	1,850
2020	256	2,157
Prior	275	1,612
Revolving Loans and Leases	0	28
Loans and leases	5,772	18,534
90 or More Days Delinquent and Accruing \| National Lending \| Loans held for sale
Financing Receivable, Nonaccrual [Line Items]
2024	0	306
2023	843	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans and Leases	0	0
Loans and leases	843	306
90 or More Days Delinquent and Accruing \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2024	0	1,604
2023	185	1,371
2022	58	500
2021	393	233
2020	254	29
Prior	0	0
Revolving Loans and Leases	0	0
Loans and leases	890	3,737
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2024	354	151
2023	121	490
2022	0	979
2021	0	784
2020	2	1,794
Prior	275	44
Revolving Loans and Leases	0	0
Loans and leases	752	4,242
90 or More Days Delinquent and Accruing \| National Lending \| Insurance premium finance
Financing Receivable, Nonaccrual [Line Items]
2024	198	0
2023	839	414
2022	0	114
2021	0	0
2020	0	334
Prior	0	1,477
Revolving Loans and Leases	0	0
Loans and leases	1,037	2,339
90 or More Days Delinquent and Accruing \| National Lending \| Other commercial finance
Financing Receivable, Nonaccrual [Line Items]
2024		0
2023		0
2022		0
2021		0
2020		0
Prior		91
Revolving Loans and Leases		0
Loans and leases		91
90 or More Days Delinquent and Accruing \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2024		0
2023		0
2022		0
2021		833
2020		0
Prior		0
Revolving Loans and Leases		0
Loans and leases		833
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2024	552	1,755
2023	1,145	2,275
2022	58	1,593
2021	393	1,850
2020	256	2,157
Prior	275	1,612
Revolving Loans and Leases	0	0
Loans and leases	2,679	11,242
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2024	309	891
2023	1,969	1,045
2022	658	246
2021	157	0
2020	0	0
Prior	0	0
Revolving Loans and Leases	0	28
Loans and leases	$ 3,093	2,210
90 or More Days Delinquent and Accruing \| National Lending \| Tax services
Financing Receivable, Nonaccrual [Line Items]
2024		5,082
2023		0
2022		0
2021		0
2020		0
Prior		0
Revolving Loans and Leases		0
Loans and leases		$ 5,082

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

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-Topic 326
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