Income Taxes, Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Taxes [Abstract]
Tax based on federal statutory rate	21.00%	28.10%
State income taxes, net of federal benefit	0.80%	0.49%
Tax-exempt income	(5.74%)	(7.03%)
Captive insurance premium income	(1.35%)	(1.78%)
Other, net	2.14%	2.35%
Total income tax expense	16.85%	22.13%