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Income Taxes, Effective Tax Rate Reconciliation (Details)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Income Taxes [Abstract]    
Tax based on federal statutory rate 34.00% 34.00%
State income taxes, net of federal benefit 0.89% 0.75%
Tax-exempt income (8.20%) (9.05%)
Captive insurance premium income (2.28%) (2.95%)
Other, net 0.55% 0.26%
Total income tax expense 24.96% 23.01%