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Share-Based Compensation Plan (Details) - The 2018 LTIP - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) 98,213   98,213     150,000
Compensation expense $ 74,000 $ 3,000 $ 197,000 $ 3,000    
Accrued dividends $ 15,602   $ 15,602   $ 9,533  
Restricted stock unit awards            
Number of Shares            
Restricted stock unit awards at January 1, 2018 (in shares)     13,733      
Granted (in shares)     14,376      
Vested (in shares)     (5,729)      
Forfeited (in shares)     325      
Restricted stock unit awards at September 30, 2018 (in shares) 22,055   22,055      
Weighted Average Grant Date Fair Value per Share            
Restricted stock unit awards at January 1, 2018 (in dollars per share)     $ 43.00      
Granted (in dollars per share)     34.00      
Vested (in dollars per share)     43.00      
Forfeited (in dollars per share)     $ 43.00      
Aggregate grant date fair value awards issues     $ 500,000      
Unrecognized compensation cost $ 700,000   $ 700,000      
Period for recognition for remaining compensation cost     1 year 9 months 18 days      
Performance Unit Awards            
Number of Shares            
Restricted stock unit awards at January 1, 2018 (in shares)     3,966      
Granted (in shares)     8,094      
Performance factor decrease (in shares)     (185)      
Vested (in shares)     0      
Forfeited (in shares)     117      
Restricted stock unit awards at September 30, 2018 (in shares) 11,758   11,758      
Weighted Average Grant Date Fair Value per Share            
Restricted stock unit awards at January 1, 2018 (in dollars per share)     $ 43.00      
Granted (in dollars per share)     34.00      
Performance factor decrease (in dollars per share)     43.00      
Vested (in dollars per share)     0      
Forfeited (in dollars per share)     $ 43.00      
Aggregate grant date fair value awards issues     $ 300,000      
Performance factor     47.50%      
Unrecognized compensation cost $ 400,000   $ 400,000      
Period for recognition for remaining compensation cost     2 years 7 months 6 days      
Performance Unit Awards | Awards Issued During 2019            
Weighted Average Grant Date Fair Value per Share            
Performance factor     100000.00%