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Share-Based Compensation Plan (Details) - The 2018 LTIP - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares)     150,000
Number of shares available for grant (in shares) 120,403 120,403  
Accrued dividends $ 0 $ 0  
Restricted stock units awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage   33.00%  
Number of Shares      
Unit awards at January 1, 2018 (in shares)   0  
Granted (in shares)   13,733  
Vested (in shares)   0  
Forfeited (in shares)   0  
Unit awards at June 30, 2018 (in shares) 13,733 13,733  
Weighted Average Grant Date Fair Value per Share      
Unit awards at January 1, 2018 (in dollars per share)   $ 0  
Granted (in dollars per share)   43.00  
Vested (in dollars per share)   0  
Forfeited (in dollars per share)   0  
Unit awards at June 30, 2018 (in dollars per share) $ 0 $ 0  
Aggregate grant date fair value awards issues   $ 600,000  
Unrecognized compensation cost $ 600,000 $ 600,000  
Period for recognition for remaining compensation cost   1 year 8 months 12 days  
Performance share unit awards      
Number of Shares      
Unit awards at January 1, 2018 (in shares)   0  
Granted (in shares)   7,932  
Vested (in shares)   0  
Forfeited (in shares)   0  
Unit awards at June 30, 2018 (in shares) 7,932 7,932  
Weighted Average Grant Date Fair Value per Share      
Unit awards at January 1, 2018 (in dollars per share)   $ 0  
Granted (in dollars per share) $ 43.00 43.00  
Vested (in dollars per share)   0  
Forfeited (in dollars per share)   0  
Unit awards at June 30, 2018 (in dollars per share) $ 0 $ 0  
Aggregate grant date fair value awards issues   $ 400,000  
Performance factor   100.00%  
Unrecognized compensation cost $ 400,000 $ 400,000  
Period for recognition for remaining compensation cost   2 years 10 months 24 days  
Award vesting period   3 years