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Equity Incentive Plan - Assumptions Used in Estimating Fair Value (Details) - $ / shares
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Weighted-average volatility 17.84% 0.00%
Expected dividend yield 0.95% 0.00%
Risk-free interest rate 1.55% 0.00%
Expected life (years) 6 years 6 months 0 years
Weighted-average fair value of options granted $ 4.67 $ 0.00