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Stock-Based Compensation Plan (Details) - The 2018 LTIP - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) 2,261     150,000
Compensation expense $ 195,000 $ 185,000    
Accrued dividends $ 83,500   $ 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) (15,966)      
Forfeited (in shares) (164)      
Unit awards, ending balance (in shares) 48,931      
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) 28.20      
Forfeited (in dollars per share) 29.70      
Unit awards, ending balance (in dollars per share) $ 30.64      
Aggregate grant date fair value awards issues $ 900,000      
Unrecognized compensation cost $ 1,100,000      
Period for recognition for remaining compensation cost 1 year 8 months 12 days      
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) 0      
Unit awards, ending balance (in shares) 34,950      
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) 0      
Unit awards, ending balance (in dollars per share) $ 28.63      
Aggregate grant date fair value awards issues $ 400,000      
Performance factor 100000.00%      
Unrecognized compensation cost $ 700,000      
Period for recognition for remaining compensation cost 2 years 4 months 24 days