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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill    
Goodwill, beginning of period $ 411,360 $ 304,750
Additions 3,362 106,610
Goodwill, end of period 414,722 411,360
Core Deposit and Other Intangibles    
Intangible assets, beginning of period 37,065 5,869
Additions 180 38,939
Amortization (9,874) (7,743)
Intangible assets, end of period 27,371 37,065
Total    
Goodwill and intangible assets, beginning of period 448,425 310,619
Additions 3,542 145,549
Amortization (9,874) (7,743)
Goodwill and intangible assets, end of period $ 442,093 $ 448,425