LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Financing Receivable, Nonaccrual [Line Items]
Loans and leases	$ 4,072,899	$ 3,536,305
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2023	103	1,228
2022	4,489	1,420
2021	2,853	5,605
2020	2,049	1,002
2019	3,380	3,104
Prior	2,525	418
Revolving Loans and Leases	14,771	598
Loans and leases	30,170	13,375
Nonaccrual with No ACL	15,399	4,634
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2023	103	251
2022	3,819	1,110
2021	2,245	1,964
2020	2,017	989
2019	3,380	3,096
Prior	1,643	166
Revolving Loans and Leases	0	0
Loans and leases	13,207	7,576
Nonaccrual with No ACL	0	2,885
Nonaccrual Loans \| National Lending \| Asset based lending
Financing Receivable, Nonaccrual [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans and Leases	14,407	29
Loans and leases	14,407	29
Nonaccrual with No ACL	14,407	0
Nonaccrual Loans \| National Lending \| Factoring
Financing Receivable, Nonaccrual [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans and Leases	364	569
Loans and leases	364	569
Nonaccrual with No ACL	0	550
Nonaccrual Loans \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2023	0	977
2022	269	310
2021	596	2,442
2020	0	13
2019	0	8
Prior	629	0
Revolving Loans and Leases	0	0
Loans and leases	1,494	3,750
Nonaccrual with No ACL	591	0
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2023	0	0
2022	401	0
2021	12	1,199
2020	32	0
2019	0	0
Prior	253	252
Revolving Loans and Leases	0	0
Loans and leases	698	1,451
Nonaccrual with No ACL	401	1,199
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2023	103	1,228
2022	4,489	1,420
2021	2,853	5,605
2020	2,049	1,002
2019	3,380	3,104
Prior	2,525	418
Revolving Loans and Leases	14,771	598
Loans and leases	30,170	13,375
Nonaccrual with No ACL	15,399	4,634
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2023	1,612	12,724
2022	4,225	1,593
2021	2,046	861
2020	309	284
2019	91	115
Prior	99	192
Revolving Loans and Leases	247	39
Loans and leases	8,629	15,808
90 or More Days Delinquent and Accruing \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2023	128	207
2022	917	720
2021	658	716
2020	107	130
2019	52	70
Prior	0	192
Revolving Loans and Leases	0	0
Loans and leases	1,862	2,035
90 or More Days Delinquent and Accruing \| National Lending \| Asset based lending
Financing Receivable, Nonaccrual [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans and Leases	218	39
Loans and leases	218	39
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2023	0	8
2022	479	158
2021	969	98
2020	152	131
2019	20	45
Prior	7	0
Revolving Loans and Leases	0	0
Loans and leases	1,627	440
90 or More Days Delinquent and Accruing \| National Lending \| Insurance premium finance
Financing Receivable, Nonaccrual [Line Items]
2023	1,149	1,513
2022	1,241	110
2021	4	5
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans and Leases	0	0
Loans and leases	2,394	1,628
90 or More Days Delinquent and Accruing \| National Lending \| Other commercial finance
Financing Receivable, Nonaccrual [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	92
Revolving Loans and Leases	0
Loans and leases	92
90 or More Days Delinquent and Accruing \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2023	0
2022	349
2021	0
2020	0
2019	0
Prior	0
Revolving Loans and Leases	0
Loans and leases	349
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2023	1,277	1,728
2022	2,986	988
2021	1,631	819
2020	259	261
2019	72	115
Prior	99	192
Revolving Loans and Leases	218	39
Loans and leases	6,542	4,142
90 or More Days Delinquent and Accruing \| National Lending \| Consumer credit products
Financing Receivable, Nonaccrual [Line Items]
2023	335	2,123
2022	1,239	481
2021	415	42
2020	50	23
2019	19	0
Prior	0	0
Revolving Loans and Leases	0	0
Loans and leases	2,058	2,669
90 or More Days Delinquent and Accruing \| National Lending \| Other consumer finance
Financing Receivable, Nonaccrual [Line Items]
2023	0	0
2022	0	124
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans and Leases	29	0
Loans and leases	29	124
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2023	335	2,123
2022	1,239	605
2021	415	42
2020	50	23
2019	19	0
Prior	0	0
Revolving Loans and Leases	29	0
Loans and leases	$ 2,087	2,793
90 or More Days Delinquent and Accruing \| National Lending \| Tax services
Financing Receivable, Nonaccrual [Line Items]
2023		8,873
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans and Leases		0
Loans and leases		$ 8,873

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

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