Treasury Stock - Schedule of Treasury Stock Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Shares
Beginning Balance (in shares)	923,621	939,632	216,188
Purchased (in shares)		7,000	752,234
Issued to Employees and Directors (in shares)	(33,480)	(23,011)	(28,790)
Ending Balance (in shares)	890,141	923,621	939,632
Cost
Beginning Balance	$ 30,779	$ 31,943	$ 7,536
Purchased		238	25,576
Issued to Employees and Directors	(926)	(1,402)	(1,169)
Ending Balance	$ 29,853	$ 30,779	$ 31,943