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Common Stock Incentive Plan - Restricted Stock (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock Incentive Plan        
Remaining unamortized share-based compensation expense   $ 8.6    
Number of shares        
Outstanding nonvested shares, beginning of year   259,698 307,821 475,768
Shares granted   103,473 87,327 183,952
Shares vested   (141,486) (126,363) (310,706)
Shares forfeited   (2,203) (9,087) (41,193)
Outstanding nonvested shares, end of each period   219,482 259,698 307,821
Weighted average price        
Outstanding nonvested shares, beginning of year (in dollars per share)   $ 58.39 $ 53.44 $ 52.32
Shares granted (in dollars per share)   67.84 69.83 52.21
Shares vested (in dollars per share)   56.94 54.45 51.05
Shares forfeited (in dollars per share)   66.48 55.71 53.06
Outstanding nonvested shares, end of each period (in dollars per share)   $ 63.69 $ 58.39 $ 53.44
Directors        
Number of shares        
Shares granted 36,000      
Employees        
Common Stock Incentive Plan        
Vesting period (in years)   4 years    
Number of shares        
Shares granted   67,473    
Three-year vesting period | Directors        
Common Stock Incentive Plan        
Vesting rights percentage   33.33%    
Vesting period (in years) 3 years 3 years    
Number of shares        
Shares granted 12,000      
Three-year vesting period | Directors | Maximum        
Common Stock Incentive Plan        
Service period as basis for restricted stock award vesting (in years)   6 years    
Two-year vesting period | Directors        
Common Stock Incentive Plan        
Service period as basis for restricted stock award vesting (in years)   6 years    
Vesting rights percentage   50.00%    
Vesting period (in years)   2 years    
One-year vesting period | Directors        
Common Stock Incentive Plan        
Service period as basis for restricted stock award vesting (in years)   7 years    
Vesting rights percentage   100.00%    
Vesting period (in years)   1 year    
One-year vesting period | CFO        
Number of shares        
Shares granted   4,541    
Immediate vesting | Directors        
Number of shares        
Shares granted 24,000      
Immediate vesting | Directors | Minimum        
Common Stock Incentive Plan        
Service period as basis for restricted stock award vesting (in years)   8 years