Earnings Per Share - Schedule of computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share
Net income	$ 11,458	$ 5,099	$ 33,491	$ 20,644
Less: distributed earnings allocated to participating securities	(5)		(13)
Less: undistributed earnings allocated to participating securities	(35)		(91)
Net income available to common shareholders	$ 11,418	$ 5,099	$ 33,387	$ 20,644
Weighted-average common shares outstanding, including participating securities	9,004,034	9,197,370	9,073,545	9,210,559
Less: weighted-average participating securities outstanding (restricted shares)	(31,845)		(28,172)
Weighted-average basic common shares outstanding	8,972,189	9,197,370	9,045,373	9,210,559
Add: effect of dilutive securities, stock options, and awards	4,026	7,422	2,579	10,848
Denominator for diluted earnings per share	8,976,215	9,204,792	9,047,952	9,221,407
Basic earnings per share available to common stockholders	$ 1.27	$ 0.55	$ 3.69	$ 2.24
Diluted earnings per share available to common stockholders	$ 1.27	$ 0.55	$ 3.69	$ 2.24