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LOANS AND LEASES, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Loans Purchased |  |  |  |
Loans held for investment | $ 20,344 | $ 27,292 | $ 53,267 | $ 166,651
Loans Sold [Abstract] |  |  |  |
Loans held for sale |  |  | 1,960,041 | 1,146,702
Loans held for investment | 783,717 | 674,428 | 1,960,041 | 1,292,860
National Lending | Commercial finance |  |  |  |
Loans Purchased |  |  |  |
Loans held for investment | 0 | 0 | 0 | 19,540
Loans Sold [Abstract] |  |  |  |
Loans held for sale | 69,989 | 182,667 | 128,552 | 248,469
National Lending | Warehouse finance |  |  |  |
Loans Purchased |  |  |  |
Loans held for investment | 20,344 | 27,292 | 53,267 | 147,111
National Lending | Consumer finance |  |  |  |
Loans Sold [Abstract] |  |  |  |
Loans held for sale | $ 713,728 | $ 491,761 | $ 1,831,489 | $ 1,044,391

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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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