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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
Nov. 30, 2019
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Stock Incentive Plan          
Remaining unamortized share-based compensation expense     $ 10.1    
Number of shares          
Outstanding nonvested shares, beginning of year     307,821 475,768 513,523
Shares granted     87,327 183,952 149,264
Shares vested     (126,363) (310,706) (183,381)
Shares forfeited     (9,087) (41,193) (3,638)
Outstanding nonvested shares, end of each period     259,698 307,821 475,768
Weighted average price          
Outstanding nonvested shares, beginning of year (in dollars per share)     $ 53.44 $ 52.32 $ 48.33
Shares granted (in dollars per share)     69.83 52.21 59.21
Shares vested (in dollars per share)     54.45 51.05 46.65
Shares forfeited (in dollars per share)     55.71 53.06 56.57
Outstanding nonvested shares, end of each period (in dollars per share)     $ 58.39 $ 53.44 $ 52.32
Directors          
Number of shares          
Shares granted 4,000 32,000      
Shares vested   (20,000)      
Employees          
Number of shares          
Shares granted     51,327    
Three-year vesting period | Directors          
Common Stock Incentive Plan          
Vesting rights percentage     33.33%    
Vesting period (in years) 3 years 3 years 3 years    
Number of shares          
Shares granted   4,000      
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    
Number of shares          
Shares granted   8,000      
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 1 year    
Immediate vesting | Directors | Minimum          
Common Stock Incentive Plan          
Service period as basis for restricted stock award vesting (in years)     8 years    
Four year-vesting period | Employees          
Common Stock Incentive Plan          
Vesting period (in years)     4 years