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Income Taxes - Schedule of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Current Federal   $ 2,438 $ 2,989 $ 260
Current State and local   1,219 1,097 970
Total current income tax expense   3,657 4,086 1,230
Deferred Federal   (8,096) 1,545 1,110
Deferred State and local   1,321 728 33
Total deferred income tax expense (benefit)   (6,775) 2,273 1,143
Total income tax expense (benefit) $ 1,300 $ (3,118) $ 6,359 $ 2,373