Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense	$ 2,451	$ 1,992		$ 5,505	$ 4,748
Federal income tax expense	1,799	1,462		4,043	3,486
State income tax expense	$ 652	$ 530		$ 1,462	$ 1,262
Reduction in provision for other adjustments			$ 520
Reduction in provision for other adjustments, impact on diluted earnings per share (in usd per share)			$ 0.02
Reduction in effective income tax rate	0.00%	0.00%		0.00%	(1.50%)