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Stock-Based Compensation Plan (Details) - The 2018 LTIP - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized (in shares) 150,000          
Number of shares authorized (in shares) 300,000 154,975   154,975    
Compensation expense   $ 263,000 $ 232,000 $ 458,000 $ 417,000  
Accrued dividends   $ 91,200   $ 91,200   $ 82,500
Restricted stock units awards            
Number of Shares            
Unit awards, beginning balance (in shares)       38,265    
Granted (in shares)       26,796    
Vested (in shares)       (18,919)    
Forfeited (in shares)       (1,673)    
Unit awards, ending balance (in shares)   44,469   44,469    
Weighted Average Grant Date Fair Value per Share            
Unit awards, beginning balance (in dollars per share)       $ 28.78    
Granted (in dollars per share)       31.83    
Vested (in dollars per share)       29.11    
Forfeited (in dollars per share)       30.64    
Unit awards, ending balance (in dollars per share)   $ 30.41   $ 30.41    
Aggregate grant date fair value awards issues       $ 900,000    
Unrecognized compensation cost   $ 900,000   $ 900,000    
Period for recognition for remaining compensation cost       1 year 6 months    
Restricted stock units awards | Minimum            
Weighted Average Grant Date Fair Value per Share            
Granted (in dollars per share)       $ 31.80    
Restricted stock units awards | Maximum            
Weighted Average Grant Date Fair Value per Share            
Granted (in dollars per share)       $ 37.42    
Performance share unit awards            
Number of Shares            
Unit awards, beginning balance (in shares)       21,492    
Granted (in shares)       13,458    
Vested (in shares)       0    
Forfeited (in shares)       (756)    
Unit awards, ending balance (in shares)   34,194   34,194    
Weighted Average Grant Date Fair Value per Share            
Unit awards, beginning balance (in dollars per share)       $ 26.64    
Granted (in dollars per share)       31.80    
Vested (in dollars per share)       0    
Forfeited (in dollars per share)       31.42    
Unit awards, ending balance (in dollars per share)   $ 28.57   $ 28.57    
Aggregate grant date fair value awards issues       $ 400,000    
Performance factor       100000.00%    
Unrecognized compensation cost   $ 600,000   $ 600,000    
Period for recognition for remaining compensation cost       2 years 2 months 12 days