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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