LOANS AND LEASES, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Loans Purchased
Loans held for investment	$ 115,353	$ 311,332
Loans Sold
Loans held for sale	1,059,361	890,340	$ 319,123
Loans held for investment	1,182,601	905,793
National Lending \| Commercial finance
Loans Purchased
Loans held for investment	3,098	0
Loans Sold
Loans held for sale	50,848	89,276
Loans held for investment	15,549	0
National Lending \| Warehouse finance
Loans Purchased
Loans held for investment	112,255	308,014
National Lending \| Consumer finance
Loans Sold
Loans held for sale	855,291	494,585
Loans held for investment	77,456	0
Community Banking
Loans Purchased
Loans held for investment	0	3,318
Loans Sold
Loans held for sale	153,222	308,082
Loans held for investment	$ 30,235	$ 13,850

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Loans Sold [Abstract]

+ References

No definition available.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3461-108585

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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585

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