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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  |  |  |  |  |  | 29.00% | 32.20% | 39.10%
Write-down of deferred tax assets from revaluation of net operating losses due to change in federal tax rate |  |  |  |  |  |  |  | $ 3,400 |  | $ 3,400 |
Income tax expense | $ 639 | $ 325 | $ 517 | $ 690 | $ 747 | $ 738 | $ 627 | $ 3,719 | $ 2,171 | 5,830 |
ATM credits receivable | 366 |  |  |  |  |  |  |  | 366 |  |
Federal |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense associated with current operations |  |  |  |  |  |  |  |  |  | 2,400 |
Net operating losses | $ 17,200 |  |  |  | $ 23,800 |  |  |  | 17,200 | $ 23,800 |
Net operating losses utilized to offset taxes otherwise currently due |  |  |  |  |  |  |  |  | $ 7,200 |  |

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