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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - National Lending - Commercial finance - USD ($) | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
TDRs subsequent default, recorded investment | $ 7,200,000 | $ 1,500,000
60-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
TDRs subsequent default, recorded investment | $ 0 |

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