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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