Income Taxes, Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Taxes [Abstract]
Tax based on federal statutory rate	21.00%	21.00%
State income taxes, net of federal benefit	0.20%	0.54%
Tax-exempt income	(6.34%)	(6.91%)
Captive insurance premium income	(1.22%)	(1.37%)
Other, net	(0.34%)	0.66%
Total income tax expense	13.30%	13.92%