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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 88,826 $ 95,054  
Less: accumulated depreciation and amortization (47,218) (49,122)  
Net book value 41,608 45,932  
Depreciation expense of premises, furniture, and equipment 9,200 8,600 $ 5,700
Land      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 1,354 2,932  
Buildings      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 20,170 30,906  
Furniture, Fixtures, and Equipment      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 67,302 $ 61,216