LOANS AND LEASES, NET - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originations of loans held-for-sale	$ 2,034,977	$ 1,208,684	$ 985,330
Sale loans	2,040,000	1,140,000
Gain on sale of held for sale loans	5,900	300
Loans and leases	4,075,195	4,366,116
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	3,042,276	3,222,502
Pass | Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 105,100	117,000
Commercial Insurance Premium Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge off period	210 days
Consumer credit products
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge off period	120 days
Commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge off period	90 days
Consumer finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 248,800	254,400
Tax services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	8,800	5,200
National Lending | Other Consumer Finance and SBA/USDA Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originations of loans held-for-sale	2,030,000	1,210,000
National Lending | Commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment		900
Financing receivable, TDR, postmodification		$ 1,100
National Lending | Commercial finance | Term Extensions and Reduced Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment	9,800
National Lending | Commercial finance | Payment Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment	1,500
National Lending | Commercial finance | Payment Deferral | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment	$ 1,500