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, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share
Net income													$ 58,578	$ 50,182	$ 39,237
Less: distributed earnings allocated to participating securities													(47)	(49)	(42)
Less: undistributed earnings allocated to participating securities													(217)	(208)	(150)
Net income available to common shareholders													$ 58,314	$ 49,925	$ 39,045
Weighted-average shares outstanding													11,234,703	11,292,634	10,124,766
Effect of dilutive securities stock options or awards													23,266	8,645	17,033
Denominator for diluted earnings per share													11,257,969	11,301,279	10,141,799
Basic earnings per share available to common stockholders	$ 1.4	$ 1.39	$ 1.3	$ 1.1	$ 1.19	$ 1	$ 1.08	$ 1.16	$ 1.37	$ 0.22	$ 1.26	$ 1.04	$ 5.19	$ 4.42	$ 3.86
Diluted earnings per share available to common stockholders	$ 1.39	$ 1.39	$ 1.3	$ 1.1	$ 1.19	$ 0.99	$ 1.07	$ 1.16	$ 1.37	$ 0.22	$ 1.26	$ 1.04	$ 5.18	$ 4.42	$ 3.85