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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]                        
Premises, furniture, and equipment, gross $ 86,862 $ 84,997                    
Less: accumulated depreciation and amortization (47,807) (45,837)                    
Net book value 39,055 39,160 $ 41,710 $ 36,953 $ 37,266 $ 38,270 $ 38,601 $ 39,735 $ 41,029 $ 42,076 $ 43,167 $ 44,130
Depreciation expense of premises, furniture, and equipment 10,200 11,100 $ 11,300                  
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 21,685 21,331                    
Furniture, fixtures, and equipment                        
Property, Plant and Equipment [Line Items]                        
Premises, furniture, and equipment, gross $ 63,823 $ 62,312