LOANS AND LEASES, NET - Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 49,705	$ 45,947	$ 68,281
Provision for credit loss	42,238	57,448	28,862
Charge-offs	(57,681)	(59,898)	(61,061)
Recoveries	11,074	6,208	9,865
Ending balance	45,336	49,705	45,947
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	272	366	690
Provision for credit loss	423	(94)	(324)
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance	695	272	366
Total Committed Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	49,977	46,313	68,971
Provision for credit loss	42,661	57,354	28,538
Charge-offs	(57,681)	(59,898)	(61,061)
Recoveries	11,074	6,208	9,865
Ending balance	46,031	49,977	46,313
National Lending | Term lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	25,686	24,621	29,351
Provision for credit loss	20,558	10,541	4,850
Charge-offs	(18,193)	(11,295)	(12,629)
Recoveries	2,343	1,819	3,049
Ending balance	30,394	25,686	24,621
National Lending | Asset-based lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,738	1,050	1,726
Provision for credit loss	(1,637)	4,005	(1,092)
Charge-offs	0	(2,873)	(16)
Recoveries	255	556	432
Ending balance	1,356	2,738	1,050
National Lending | Factoring
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,566	6,556	3,997
Provision for credit loss	1,420	1,523	11,699
Charge-offs	(2,453)	(1,545)	(11,057)
Recoveries	224	32	1,917
Ending balance	5,757	6,566	6,556
National Lending | Lease financing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,302	5,902	7,629
Provision for credit loss	(2,010)	(1,424)	(2,062)
Charge-offs	(287)	(1,479)	(301)
Recoveries	184	303	636
Ending balance	1,189	3,302	5,902
National Lending | Insurance premium finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,637	1,450	1,394
Provision for credit loss	(1,767)	2,349	597
Charge-offs	(1,149)	(1,659)	(767)
Recoveries	279	497	226
Ending balance	0	2,637	1,450
National Lending | SBA/USDA
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,962	3,263	2,978
Provision for credit loss	1,065	(296)	863
Charge-offs	(755)	(43)	(652)
Recoveries	1	38	74
Ending balance	3,273	2,962	3,263
National Lending | Other commercial finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,089	1,310	1,168
Provision for credit loss	(2,482)	1,779	142
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance	607	3,089	1,310
National Lending | Commercial finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	46,980	44,152	48,243
Provision for credit loss	15,147	18,477	14,997
Charge-offs	(22,837)	(18,894)	(25,422)
Recoveries	3,286	3,245	6,334
Ending balance	42,576	46,980	44,152
National Lending | Consumer finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,346	1,463	7,354
Provision for credit loss	3,955	3,146	(1,449)
Charge-offs	(4,064)	(2,263)	(4,787)
Recoveries	3	0	345
Ending balance	2,240	2,346	1,463
National Lending | Tax services
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	5	2
Provision for credit loss	22,995	35,775	28,093
Charge-offs	(30,780)	(38,741)	(30,852)
Recoveries	7,785	2,963	2,762
Ending balance	2	2	5
National Lending | Warehouse finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	377	327	420
Provision for credit loss	141	50	(93)
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance	$ 518	377	327
Community Banking | Warehouse finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 0	12,262
Provision for credit loss			(12,686)
Charge-offs			0
Recoveries			424
Ending balance			$ 0