Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Current
Federal	$ 1,321	$ 2,216
State	552	724
Total	1,873	2,940
Deferred
Federal	904	1,049
State	343	255
Deferred income tax expense (benefit), total	1,247	1,304
Total	$ 3,120	$ 4,244