Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Current tax provision
Federal			$ 1,989	$ 572
State			530	117
Current Income Tax Expense (Benefit), Total			2,519	689
Deferred tax provision (benefit)
Federal			(410)	535
Federal deferred tax adjustment - the Tax Act	$ 275	$ 63	338	0
State			121	(99)
Deferred tax provision (benefit)			(193)	634
Total			$ 2,326	$ 1,323