LOANS AND LEASES, NET - Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Financing Receivable, Nonaccrual [Line Items]
Loans and leases	$ 3,730,190	$ 3,609,563
Nonaccrual Loans
Financing Receivable, Nonaccrual [Line Items]
2022	158
2021	710
2020	4,128
2019	9,041
2018	888
Prior	445
Revolving Loans and Leases	9,957
Loans and leases	25,327
Nonaccrual with No ACL	6,483
Nonaccrual Loans \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2022	158
2021	688
2020	2,018
2019	6,851
2018	448
Prior	120
Revolving Loans and Leases	0
Loans and leases	10,283
Nonaccrual with No ACL	2,958
Nonaccrual Loans \| National Lending \| Asset based lending
Financing Receivable, Nonaccrual [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	0
Prior	0
Revolving Loans and Leases	5,996
Loans and leases	5,996
Nonaccrual with No ACL	0
Nonaccrual Loans \| National Lending \| Factoring
Financing Receivable, Nonaccrual [Line Items]
2022	0
2021	0
2020	0
2019	0
2018	0
Prior	0
Revolving Loans and Leases	3,961
Loans and leases	3,961
Nonaccrual with No ACL	3,525
Nonaccrual Loans \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2022	0
2021	0
2020	420
2019	2,190
2018	440
Prior	14
Revolving Loans and Leases	0
Loans and leases	3,064
Nonaccrual with No ACL	0
Nonaccrual Loans \| National Lending \| SBA/USDA
Financing Receivable, Nonaccrual [Line Items]
2022	0
2021	22
2020	1,690
2019	0
2018	0
Prior	311
Revolving Loans and Leases	0
Loans and leases	2,023
Nonaccrual with No ACL	0
Nonaccrual Loans \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2022	158
2021	710
2020	4,128
2019	9,041
2018	888
Prior	445
Revolving Loans and Leases	9,957
Loans and leases	25,327
Nonaccrual with No ACL	6,483
90 or More Days Delinquent and Accruing
Financing Receivable, Nonaccrual [Line Items]
2022	3,442
2021	4,886
2020	991
2019	352
2018	148
Prior	696
Revolving Loans and Leases	0
Loans and leases	10,515
90 or More Days Delinquent and Accruing \| National Lending \| Term lending
Financing Receivable, Nonaccrual [Line Items]
2022	421
2021	330
2020	549
2019	100
2018	0
Prior	0
Revolving Loans and Leases	0
Loans and leases	1,400
90 or More Days Delinquent and Accruing \| National Lending \| Lease financing
Financing Receivable, Nonaccrual [Line Items]
2022	1,680
2021	883
2020	398
2019	161
2018	128
Prior	96
Revolving Loans and Leases	0
Loans and leases	3,346
90 or More Days Delinquent and Accruing \| National Lending \| Insurance premium finance
Financing Receivable, Nonaccrual [Line Items]
2022	188
2021	762
2020	5
2019	0
2018	0
Prior	0
Revolving Loans and Leases	0
Loans and leases	955
90 or More Days Delinquent and Accruing \| National Lending \| Commercial finance
Financing Receivable, Nonaccrual [Line Items]
2022	2,289
2021	1,975
2020	952
2019	261
2018	128
Prior	96
Revolving Loans and Leases	0
Loans and leases	5,701
90 or More Days Delinquent and Accruing \| National Lending \| Consumer credit products
Financing Receivable, Nonaccrual [Line Items]
2022	119
2021	2,781
2020	39
2019	91
2018	20
Prior	0
Revolving Loans and Leases	0
Loans and leases	3,050
90 or More Days Delinquent and Accruing \| National Lending \| Other consumer finance
Financing Receivable, Nonaccrual [Line Items]
2022	1,034
2021	130
2020	0
2019	0
2018	0
Prior	600
Revolving Loans and Leases	0
Loans and leases	1,764
90 or More Days Delinquent and Accruing \| National Lending \| Consumer finance
Financing Receivable, Nonaccrual [Line Items]
2022	1,153
2021	2,911
2020	39
2019	91
2018	20
Prior	600
Revolving Loans and Leases	0
Loans and leases	$ 4,814

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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