Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 21,152	$ 21,623	$ 22,186	$ 18,187	$ 20,444	$ 18,898	$ 64,961	$ 57,529
Income allocated to participating securities	(11)			(12)			(35)	(39)
Net income available to common stockholders, basic	21,141			18,175			64,926	57,490
Net Income available to common stockholders, diluted	$ 21,141			$ 18,175			$ 64,926	$ 57,490
Total basic average common shares outstanding	135,724,658			135,504,869			135,675,959	135,450,951
Effect of dilutive stock options	0			32,283			0	26,615
Total diluted average common shares outstanding	135,724,658			135,537,152			135,675,959	135,477,566
Net EPS
Basic	$ 0.16			$ 0.13			$ 0.48	$ 0.42
Diluted	$ 0.16			$ 0.13			$ 0.48	$ 0.42
Antidilutive stock options, excluded from the diluted average common shares outstanding calculation	507,115			93,565			531,305	210,529