Employee Benefits - Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details)	12 Months Ended
	Jun. 30, 2021 $ / shares shares
38 mo.
Weighted Average Remaining Contractual Life	38 months
Options Outstanding, Number | shares	10,000
Options Outstanding, Weighted Average Exercise Price	$ 17.55
Options Exercisable, Number | shares	10,000
Options Exercisable, Weighted Average Exercise Price	$ 17.55
79 mo.
Weighted Average Remaining Contractual Life	79 months
Options Outstanding, Number | shares	13,500
Options Outstanding, Weighted Average Exercise Price	$ 37.31
Options Exercisable, Number | shares	8,100
Options Exercisable, Weighted Average Exercise Price	$ 37.31
90 mo.
Weighted Average Remaining Contractual Life	90 months
Options Outstanding, Number | shares	17,500
Options Outstanding, Weighted Average Exercise Price	$ 34.35
Options Exercisable, Number | shares	7,000
Options Exercisable, Weighted Average Exercise Price	$ 34.35
104 mo.
Weighted Average Remaining Contractual Life	104 months
Options Outstanding, Number | shares	19,500
Options Outstanding, Weighted Average Exercise Price	$ 37.40
Options Exercisable, Number | shares	3,900
Options Exercisable, Weighted Average Exercise Price	$ 37.40
115 mo.
Weighted Average Remaining Contractual Life	115 months
Options Outstanding, Number | shares	29,000
Options Outstanding, Weighted Average Exercise Price	$ 34.91
Options Exercisable, Weighted Average Exercise Price	$ 34.91