Income Taxes - Schedule of Provision for Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Current:
Federal income tax									$ 131	$ 7,314	$ 1,961
State income tax									(71)	2,202	384
Total current									60	9,516	2,345
Deferred:
Federal income tax									6,151	2,995	(3,917)
State income tax									1,452	272	1,962
Total deferred									7,603	3,267	(1,955)
Income tax provision	$ 5,635	$ 171	$ 1,496	$ 361	$ 5,701	$ 5,483	$ 2,228	$ (629)	$ 7,663	$ 12,783	$ 390