Summary of Significant Accounting Policies (Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Lease descriptions
Option to extend the lease term	true
Option to terminate the lease	false
Lease option length in years	5 years
Lease cost
Operating and variable lease expenses	$ 1,800
Rent expense	1,900	$ 1,300	$ 1,200
Maturities of operating lease liabilities
2021	1,792
2022	1,806
2023	1,857
2024	1,686
2025	1,730
Thereafter	12,366
Total lease payments	21,237
Less imputed interest	(6,510)
Lease liability	$ 14,727
Schedule of future minimum lease payments
2020		988
2021		839
2022		824
2023		853
2024		655
Thereafter		1,350
Total lease payments		$ 5,509
Weighted average remaining lease term (years)	14 years 4 months 24 days
Weighted average discount rate	6.10%