LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Nonaccrual [Line Items]
Loans and leases	$ 4,426,281	$ 4,366,116
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2024	1,264	865
2023	3,010	5,692
2022	7,666	3,379
2021	2,521	2,825
2020	4,007	3,134
Prior	3,865	2,097
Revolving Loans and Leases	5,766	19,380
Loans and leases	28,099	37,372
Nonaccrual with No ACL	5,812	1
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2024	1,264	865
2023	2,002	4,942
2022	7,666	2,933
2021	2,082	2,165
2020	1,925	3,134
Prior	3,039	1,285
Revolving Loans and Leases	0	0
Loans and leases	17,978	15,324
Nonaccrual with No ACL	0	0
Nonaccrual Loans \| National Lending \| Asset-based lending
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	4,593	18,082
Loans and leases	4,593	18,082
Nonaccrual with No ACL	4,469	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	1,173	1,298
Loans and leases	1,173	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	0	446
2021	439	660
2020	781	0
Prior	425	560
Revolving Loans and Leases	0	0
Loans and leases	1,645	1,666
Nonaccrual with No ACL	593	1
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2024	0	0
2023	1,008	750
2022	0	0
2021	0	0
2020	1,301	0
Prior	401	252
Revolving Loans and Leases	0	0
Loans and leases	2,710	1,002
Nonaccrual with No ACL	750	0
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2024	1,264	865
2023	3,010	5,692
2022	7,666	3,379
2021	2,521	2,825
2020	4,007	3,134
Prior	3,865	2,097
Revolving Loans and Leases	5,766	19,380
Loans and leases	28,099	37,372
Nonaccrual with No ACL	5,812	1
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2024	0	8,034
2023	3,698	3,320
2022	4,404	1,839
2021	1,321	1,850
2020	669	2,157
Prior	1,270	1,612
Revolving Loans and Leases	20	28
Loans and leases	11,382	18,840
90 or More Days Delinquent and Accruing \| Total loans and leases held for investment
Financing Receivable, Nonaccrual [Line Items]
2024	0	7,728
2023	3,037	3,320
2022	4,404	1,839
2021	1,321	1,850
2020	669	2,157
Prior	1,270	1,612
Revolving Loans and Leases	20	28
Loans and leases	10,721	18,534
90 or More Days Delinquent and Accruing \| National Lending \| Loans held for sale
Financing Receivable, Nonaccrual [Line Items]
2024	0	306
2023	661	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans and Leases	0	0
Loans and leases	661	306
90 or More Days Delinquent and Accruing \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2024	0	1,604
2023	1,139	1,371
2022	2,290	500
2021	186	233
2020	383	29
Prior	8	0
Revolving Loans and Leases	0	0
Loans and leases	4,006	3,737
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2024	0	151
2023	0	490
2022	498	979
2021	895	784
2020	95	1,794
Prior	0	44
Revolving Loans and Leases	0	0
Loans and leases	1,488	4,242
90 or More Days Delinquent and Accruing \| National Lending \| Insurance premium finance
Financing Receivable, Nonaccrual [Line Items]
2024	0	0
2023	0	414
2022	910	114
2021	5	0
2020	0	334
Prior	1,009	1,477
Revolving Loans and Leases	0	0
Loans and leases	1,924	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	0
2023	0	0
2022	0	0
2021	0	833
2020	191	0
Prior	253	0
Revolving Loans and Leases	0	0
Loans and leases	444	833
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2024	0	1,755
2023	1,139	2,275
2022	3,698	1,593
2021	1,086	1,850
2020	669	2,157
Prior	1,270	1,612
Revolving Loans and Leases	0	0
Loans and leases	7,862	11,242
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2024	0	891
2023	1,898	1,045
2022	706	246
2021	235	0
2020	0	0
Prior	0	0
Revolving Loans and Leases	20	28
Loans and leases	$ 2,859	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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