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Income Taxes - Schedule of Provision for Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Current: |  |  |  |  |  |  |  |  |  |  |
Federal income tax |  |  |  |  |  |  |  |  | $ 1,961 | $ 102 | $ 244
State income tax |  |  |  |  |  |  |  |  | 384 | 0 | 0
Total current |  |  |  |  |  |  |  |  | 2,345 | 102 | 244
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal income tax |  |  |  |  |  |  |  |  | (3,917) | (3,286) | 4,538
State income tax |  |  |  |  |  |  |  |  | 1,962 | (662) | 739
Total deferred |  |  |  |  |  |  |  |  | (1,955) | (3,948) | 5,277
Provision (benefit) for income taxes | $ (284) | $ 4,941 | $ 8,150 | $ (12,417) | $ (10,559) | $ 3,665 | $ 4,321 | $ (1,273) | $ 390 | $ (3,846) | $ 5,521

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