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Common Stock Incentive Plan - Restricted Stock Activity (Details) - Restricted stock - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Number of shares        
Outstanding nonvested shares, beginning of year (in shares)   212,630 219,482 259,698
Shares granted (in shares)   156,274 133,052 103,473
Shares vested (in shares)   (118,160) (124,505) (141,486)
Shares forfeited (in shares)   (8,084) (15,399) (2,203)
Outstanding nonvested shares, end of each period (in shares)   242,660 212,630 219,482
Weighted average price        
Outstanding nonvested shares, beginning of year (in dollars per share)   $ 65.20 $ 63.69 $ 58.39
Shares granted (in dollars per share)   67.37 64.27 67.84
Shares vested (in dollars per share)   63.95 61.57 56.94
Shares forfeited (in dollars per share)   67.78 65.09 66.48
Outstanding nonvested shares, end of each period (in dollars per share)   $ 67.12 $ 65.20 $ 63.69
Vesting period (in years)   4 years    
Remaining unamortized share-based compensation expense   $ 11.4    
Directors        
Number of shares        
Shares granted (in shares) 8,000 40,000 36,000 36,000
Weighted average price        
Service period as basis for restricted stock award vesting (in years) 3 years 3 years    
Directors | One-year vesting period        
Number of shares        
Shares granted (in shares)   20,000 24,000 24,000
Weighted average price        
Service period as basis for restricted stock award vesting (in years)   7 years    
Vesting rights percentage   100.00%    
Directors | Two-year vesting period        
Number of shares        
Shares granted (in shares)   20,000 12,000 12,000
Weighted average price        
Vesting period (in years)   2 years    
Service period as basis for restricted stock award vesting (in years)   6 years    
Vesting rights percentage   50.00%    
Directors | Three-year vesting period        
Weighted average price        
Vesting period (in years)   3 years    
Vesting rights percentage   33.33%    
Directors | Three-year vesting period | Maximum        
Weighted average price        
Service period as basis for restricted stock award vesting (in years)   6 years    
Directors | Immediate vesting | Minimum        
Weighted average price        
Service period as basis for restricted stock award vesting (in years)   8 years