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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - National Lending - Commercial finance - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]      
TDRs subsequent default, recorded investment $ 1.5 $ 1.5 $ 0.4
60-89 Days Past Due      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
TDRs subsequent default, recorded investment   $ 1.5