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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 99,212 $ 88,826  
Less: accumulated depreciation and amortization (54,324) (47,218)  
Net book value 44,888 41,608  
Depreciation expense of premises, furniture, and equipment 9,600 9,200 $ 8,600
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 21,196 20,170  
Furniture, Fixtures, and Equipment      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 76,662 $ 67,302