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Recent Accounting Pronouncements - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018
Investments, Owned, Federal Income Tax Note [Line Items] |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, income tax expense (benefit) | $ 548,000 |
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit) | $ 551,000 |
Forecast |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |
Statutory tax rate |  | 24.50%

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