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Income Taxes, Effective Tax Rate Reconciliation (Details)
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Income Taxes [Abstract]    
Tax based on federal statutory rate 34.00% 34.00%
State income taxes, net of federal benefit 0.75% 0.38%
Tax-exempt income (9.05%) (8.75%)
Captive insurance premium income (2.95%) (1.79%)
Other, net 0.26% 0.54%
Total income tax expense 23.01% 24.38%