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PREMISES, FURNITURE, AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 88,988 $ 61,413  
Less: accumulated depreciation and amortization (48,530) (42,093)  
Net book value 40,458 19,320  
Depreciation expense of premises, furniture, and equipment 5,700 5,500 $ 5,400
Amortization expense on capitalized leases 100 100 $ 200
Land [Member]      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 2,932 1,578  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 27,359 10,642  
Furniture, Fixtures, and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross 56,438 46,934  
Capitalized Leases [Member]      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, gross $ 2,259 $ 2,259