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Summary of Significant Accounting Policies - Restricted Stock Activity (Details) - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Shares    
Unvested, beginning of period (in shares) 140,577  
Unvested, end of period (in shares) 139,532  
Restricted Stock    
Shares    
Unvested, beginning of period (in shares) 140,577 155,945
Granted (in shares) 16,130 20,262
Vested (in shares) (14,465) (20,395)
Forfeited (in shares) (2,710) (3,190)
Unvested, end of period (in shares) 139,532 152,622
Weighted-Average Grant Date Fair Value    
Nonvested, beginning of period (in dollars per share) $ 48.57 $ 48.52
Granted (in dollars per share) 50.58 44.03
Vested (in dollars per share) 51.18 43.89
Forfeited (in dollars per share) 47.94 45.44
Nonvested, end of period (in dollars per share) $ 48.55 $ 48.60