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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 93,013 $ 86,862  
Less: accumulated depreciation and amortization (52,381) (47,807)  
Net book value 40,632 39,055  
Depreciation expense of premises, furniture, and equipment 9,600 10,200 $ 11,100
Land      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 1,354 1,354  
Buildings      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 22,203 21,685  
Furniture, fixtures, and equipment      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 69,456 $ 63,823