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Employee Stock Ownership Plan - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement [Abstract]        
Initial term of employer loan   15 years    
Employer loan, annual interest rate   3.71%    
Compensation Expense $ 2.5   $ 0.9 $ 2.3