Earnings Per Share - Schedule of computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share
Net Income													$ 39,237	$ 47,169	$ 47,180
Less: distributed earnings allocated to participating securities													(42)	(30)	(18)
Less: undistributed earnings allocated to participating securities													(150)	(165)	(135)
Net income available to common shareholders													$ 39,045	$ 46,974	$ 47,027
Weighted-average shares outstanding													10,124,766	8,994,022	9,007,814
Effect of dilutive securities stock options or awards													17,033	17,122	2,923
Denominator for diluted earnings per share													10,141,799	9,011,144	9,010,737
Basic earnings per share available to common stockholders	$ 1.37	$ 0.22	$ 1.26	$ 1.04	$ 1.41	$ 1.03	$ 1.35	$ 1.43	$ 1.53	$ 1.27	$ 1.33	$ 1.09	$ 3.86	$ 5.22	$ 5.22
Diluted earnings per share available to common stockholders	$ 1.37	$ 0.22	$ 1.26	$ 1.04	$ 1.41	$ 1.03	$ 1.34	$ 1.43	$ 1.53	$ 1.27	$ 1.32	$ 1.09	$ 3.85	$ 5.21	$ 5.22