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Stock-Based Compensation - Restricted Stock and Restricted Share Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock-based compensation      
Period for recognition of unrecognized compensation expense 7 months 6 days    
Restricted Stock      
Number of Shares      
Unvested as of beginning of period (in shares) 262,377 139,718  
Granted (in shares) 0 172,046 162,550
Vested (in shares) (105,330) (48,340) (11,239)
Forfeited (in shares) (7,172) (1,047) (11,593)
Unvested as of end of period (in shares) 149,875 262,377 139,718
Weighted Average Grant Date Fair Value      
Unvested as of beginning of period (in dollars per share) $ 26.35 $ 27.04  
Granted (in dollars per share)   25.96 $ 27.06
Vested (in dollars per share) 26.46 27.03 27.37
Forfeited (in dollars per share) 26.15 25.96 27.04
Unvested as of end of period (in dollars per share) $ 26.28 $ 26.35 $ 27.04
Stock-based compensation      
Total fair value of vested shares (in dollars) $ 2.8 $ 1.3 $ 0.3
Period following vesting date for lapsing of transfer restrictions 3 years    
Unrecognized compensation expense $ 1.1 $ 4.1 $ 2.9
Period for recognition of unrecognized compensation expense 7 months 2 days