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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - National Lending - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Commercial finance        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDRs recorded investment $ 0 $ 200,000 $ 0 $ 10,300,000
TDRs subsequent default, recorded investment   300,000 $ 100,000 2,600,000
Consumer finance        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
TDRs recorded investment $ 0 200,000   200,000
TDRs subsequent default, recorded investment   $ 300,000   $ 800,000