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U.S. Tax Reform (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |
Effective Income Tax Rate |  |  |  |  |  | 24.50%
Income tax expense | $ 1,277,000 | $ 1,216,000 |  | $ 2,710,000 | $ 2,997,000 |
Change in tax rate, deferred tax asset, income tax expense (benefit) |  |  |  | $ 551,000 |  |
Deferred Tax Asset |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |
Income tax expense |  |  | $ 548,000 |  |  |

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