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LOANS AND LEASES, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- 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 -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 + Details
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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 -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 + Details
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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 -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-21 + Details
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