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ALLOWANCE FOR LOAN LOSSES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Receivables [Abstract]                
Allowance for loan losses $ 27,078 $ 14,602 $ 27,078 $ 14,602 $ 8,862 $ 7,534 $ 6,415 $ 5,635
Additional expense related to tax services     19,100          
Provision for loan losses $ 18,343 $ 8,649 19,411 9,492 [1]        
Net charge offs (recoveries)     $ (100) $ 500        
[1] See Note 1. Basis of Presentation for further discussion on the current presentation.