LOANS AND LEASES, NET - Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 68,281	$ 56,188
Provision for credit losses	28,862	49,939
Charge-offs	(61,061)	(57,273)
Recoveries	9,865	6,654
Ending balance	45,947	68,281
Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	12,773
Ending balance		0
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	690	32
Provision for credit losses	(324)	(173)
Charge-offs	0	0
Recoveries	0	0
Ending balance	366	690
Unfunded Loan Commitment | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		831
Total Committed Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	68,971	56,220
Provision for credit losses	28,538	49,766
Charge-offs	(61,061)	(57,273)
Recoveries	9,865	6,654
Ending balance	46,313	68,971
Total Committed Loans | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		13,604
National Lending | Term lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	29,351	15,211
Provision for credit losses	4,850	16,944
Charge-offs	(12,629)	(14,090)
Recoveries	3,049	1,287
Ending balance	24,621	29,351
National Lending | Term lending | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		9,999
National Lending | Asset based lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,726	1,406
Provision for credit losses	(1,092)	933
Charge-offs	(16)	(1,200)
Recoveries	432	423
Ending balance	1,050	1,726
National Lending | Asset based lending | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		164
National Lending | Factoring
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,997	3,027
Provision for credit losses	11,699	(1,192)
Charge-offs	(11,057)	0
Recoveries	1,917	1,175
Ending balance	6,556	3,997
National Lending | Factoring | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		987
National Lending | Lease financing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7,629	7,023
Provision for credit losses	(2,062)	3,758
Charge-offs	(301)	(2,969)
Recoveries	636	373
Ending balance	5,902	7,629
National Lending | Lease financing | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		(556)
National Lending | Insurance premium finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,394	2,129
Provision for credit losses	597	(555)
Charge-offs	(767)	(1,192)
Recoveries	226	1,977
Ending balance	1,450	1,394
National Lending | Insurance premium finance | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		(965)
National Lending | SBA/USDA
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,978	940
Provision for credit losses	863	(703)
Charge-offs	(652)	0
Recoveries	74	21
Ending balance	3,263	2,978
National Lending | SBA/USDA | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2,720
National Lending | Other commercial finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,168	182
Provision for credit losses	142	622
Charge-offs	0	0
Recoveries	0	0
Ending balance	1,310	1,168
National Lending | Other commercial finance | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		364
National Lending | Commercial finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	48,243	29,918
Provision for credit losses	14,997	19,807
Charge-offs	(25,422)	(19,451)
Recoveries	6,334	5,256
Ending balance	44,152	48,243
National Lending | Commercial finance | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		12,713
National Lending | Consumer credit products
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,242	845
Provision for credit losses	158	397
Charge-offs	0	0
Recoveries	0	0
Ending balance	1,400	1,242
National Lending | Consumer credit products | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		0
National Lending | Other consumer finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,112	2,821
Provision for credit losses	(1,607)	297
Charge-offs	(4,787)	(3,324)
Recoveries	345	320
Ending balance	63	6,112
National Lending | Other consumer finance | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5,998
National Lending | Consumer finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7,354	3,666
Provision for credit losses	(1,449)	694
Charge-offs	(4,787)	(3,324)
Recoveries	345	320
Ending balance	1,463	7,354
National Lending | Consumer finance | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5,998
National Lending | Tax services
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	2
Provision for credit losses	28,093	33,276
Charge-offs	(30,852)	(34,354)
Recoveries	2,762	1,078
Ending balance	5	2
National Lending | Tax services | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		0
National Lending | Warehouse finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	420	294
Provision for credit losses	(93)	127
Charge-offs	0	0
Recoveries	0	0
Ending balance	327	420
National Lending | Warehouse finance | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		(1)
Community Banking
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12,262	22,308
Provision for credit losses	(12,686)	(3,965)
Charge-offs	0	(144)
Recoveries	424	0
Ending balance	$ 0	12,262
Community Banking | Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ (5,937)