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Employee Stock Ownership Plan - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Initial term of employer loan         15 years
Employer loan, annual interest rate         3.80%
Compensation Expense $ 0.4 $ 0.6 $ 0.9 $ 1.2  
Difference between cost and market value of committed to be released shares         $ 0.1