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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Held for Sale (Details) - National Lending - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Consumer    
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Reconciliation to Cash Flow [Roll Forward]    
Beginning of year balance $ 21,071 $ 23,111
Originations 1,206,201 856,819
Proceeds from sales (1,123,271) (855,291)
Gain (loss) on sales 0 0
Principal collections, net of deferred fees and costs (26,222) (4,062)
Non-cash transfers, net 0 494
End of year balance 77,779 21,071
Commercial    
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Reconciliation to Cash Flow [Roll Forward]    
Beginning of year balance 0 33,083
Originations 2,483 128,511
Proceeds from sales (16,610) (50,848)
Gain (loss) on sales 268 5,813
Principal collections, net of deferred fees and costs   (625)
Principal collections, net of deferred fees and costs 280  
Non-cash transfers, net 13,579 (115,934)
End of year balance $ 0 $ 0