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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 84,997 $ 79,285  
Less: accumulated depreciation and amortization (45,837) (37,575)  
Net book value 39,160 41,710  
Depreciation expense of premises, furniture, and equipment 11,100 11,300 $ 9,600
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 21,331 21,300  
Furniture, Fixtures, and Equipment      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 62,312 $ 56,631