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LOANS AND LEASES, NET - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Originations of loans held-for-sale $ 2,497,787 $ 2,034,977 $ 1,208,684
Sale loans 2,910,000 2,040,000  
Gain on sale of held for sale loans 37,000 5,900  
Loans and leases 4,664,908 4,075,195  
Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 3,615,399 3,042,276  
Pass | Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 107,700 105,100  
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 $ 93,300 248,800  
Tax services      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases 2,500 8,800  
National Lending | Other Consumer Finance and SBA/USDA Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Originations of loans held-for-sale 2,500,000 2,030,000  
National Lending | Commercial finance | Term Extensions and Reduced Payments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDRs subsequent default, recorded investment 6,700 9,800  
National Lending | Commercial finance | Payment Deferral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
TDRs subsequent default, recorded investment 5,900 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 $ 5,900 $ 1,500