LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Financing Receivable, Nonaccrual [Line Items]
Loans and leases	$ 3,725,616	$ 3,536,305
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2023	103	1,228
2022	6,237	1,420
2021	3,116	5,605
2020	3,242	1,002
2019	2,420	3,104
Prior	462	418
Revolving Loans and Leases	4,005	598
Loans and leases	19,585	13,375
Nonaccrual with No ACL	4,129	4,634
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2023	103	251
2022	5,123	1,110
2021	2,507	1,964
2020	2,351	989
2019	739	3,096
Prior	68	166
Revolving Loans and Leases	0	0
Loans and leases	10,891	7,576
Nonaccrual with No ACL	2,370	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	3,493	29
Loans and leases	3,493	29
Nonaccrual with No ACL	0	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	512	569
Loans and leases	512	569
Nonaccrual with No ACL	0	550
Nonaccrual Loans \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2023	0	977
2022	0	310
2021	609	2,442
2020	891	13
2019	1,681	8
Prior	142	0
Revolving Loans and Leases	0	0
Loans and leases	3,323	3,750
Nonaccrual with No ACL	645	0
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2023	0	0
2022	1,114	0
2021	0	1,199
2020	0	0
2019	0	0
Prior	252	252
Revolving Loans and Leases	0	0
Loans and leases	1,366	1,451
Nonaccrual with No ACL	1,114	1,199
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2023	103	1,228
2022	6,237	1,420
2021	3,116	5,605
2020	3,242	1,002
2019	2,420	3,104
Prior	462	418
Revolving Loans and Leases	4,005	598
Loans and leases	19,585	13,375
Nonaccrual with No ACL	4,129	4,634
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2023	2,642	12,724
2022	3,789	1,593
2021	1,499	861
2020	509	284
2019	104	115
Prior	353	192
Revolving Loans and Leases	45	39
Loans and leases	8,941	15,808
90 or More Days Delinquent and Accruing \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2023	1,346	207
2022	35	720
2021	132	716
2020	211	130
2019	40	70
Prior	188	192
Revolving Loans and Leases	0	0
Loans and leases	1,952	2,035
90 or More Days Delinquent and Accruing \| National Lending \| Asset based lending
Financing Receivable, Nonaccrual [Line Items]
2023		0
2022		0
2021		0
2020		0
2019		0
Prior		0
Revolving Loans and Leases		39
Loans and leases		39
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2023	90	8
2022	468	158
2021	953	98
2020	198	131
2019	30	45
Prior	68	0
Revolving Loans and Leases	0	0
Loans and leases	1,807	440
90 or More Days Delinquent and Accruing \| National Lending \| Insurance premium finance
Financing Receivable, Nonaccrual [Line Items]
2023	0	1,513
2022	1,849	110
2021	10	5
2020	8	0
2019	4	0
Prior	0	0
Revolving Loans and Leases	0	0
Loans and leases	1,871	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	94
Revolving Loans and Leases	0
Loans and leases	94
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2023	1,436	1,728
2022	2,352	988
2021	1,095	819
2020	417	261
2019	74	115
Prior	350	192
Revolving Loans and Leases	0	39
Loans and leases	5,724	4,142
90 or More Days Delinquent and Accruing \| National Lending \| Consumer credit products
Financing Receivable, Nonaccrual [Line Items]
2023	174	2,123
2022	1,437	481
2021	404	42
2020	92	23
2019	30	0
Prior	3	0
Revolving Loans and Leases	0	0
Loans and leases	2,140	2,669
90 or More Days Delinquent and Accruing \| National Lending \| Other consumer finance
Financing Receivable, Nonaccrual [Line Items]
2023	1,032	0
2022	0	124
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans and Leases	45	0
Loans and leases	1,077	124
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2023	1,206	2,123
2022	1,437	605
2021	404	42
2020	92	23
2019	30	0
Prior	3	0
Revolving Loans and Leases	45	0
Loans and leases	$ 3,217	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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