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Stock-Based Compensation Plans - Restricted Stock Activity (Details) - Restricted stock - $ / shares
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Restricted stock shares    
Equity instruments outstanding at the beginning of the period (in shares) 173,291  
Granted (in shares) 101,695 91,037
Vested (in shares) (80,632)  
Forfeited (in shares) (1,753)  
Equity instruments outstanding at the end of the period (in shares) 192,601  
Weighted average grant date fair value per share    
Equity instruments outstanding at the beginning of the period (in dollars per share) $ 194.68  
Grant date fair value per share (in dollars per share) 172.13  
Vested (in dollars per share) 193.98  
Forfeited (in dollars per share) 191.88  
Equity instruments outstanding at the end of the period (in dollars per share) $ 183.09