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ALLOWANCE FOR LOAN LOSSES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Receivables [Abstract]                
Allowance for loan losses $ 21,950 $ 14,968 $ 21,950 $ 14,968 $ 27,078 $ 7,534 $ 14,602 $ 5,635
Additional expense related to tax services     20,300          
Provision for loan losses $ 5,315 $ 1,240 24,726 10,732        
Net charge offs (recoveries)     $ 10,300 $ 1,400