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LOANS AND LEASES, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Loans Purchased
Loans held for investment	$ 226,228	$ 298,262
Loans Sold
Loans held for sale	2,767,616	2,036,084	$ 1,139,881
Loans held for investment	2,913,774	2,036,084
National Lending | Commercial finance
Loans Purchased
Loans held for investment	20,811	13,782
Loans Sold
Loans held for sale	563,997	99,005
National Lending | Warehouse finance
Loans Purchased
Loans held for investment	205,417	284,480
National Lending | Consumer finance
Loans Sold
Loans held for sale	$ 2,349,777	$ 1,937,079

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Loans Sold [Abstract]

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The cash outflow from (a) purchases of loans held-for-investment, (b) purchases of leases held-for-investment, and (c) both.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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The net cash inflow from (a) sales of loans held-for-investment, (b) sales of leases held-for-investment, and (c) both. Includes proceeds from securitizations of loans.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

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