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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 95,054 $ 88,988  
Less: accumulated depreciation and amortization (49,122) (48,530)  
Net book value 45,932 40,458  
Depreciation expense of premises, furniture, and equipment 8,600 5,700 $ 5,500
Land      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 2,932 2,932  
Buildings      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 30,906 29,459  
Furniture, Fixtures, and Equipment      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 61,216 $ 56,597