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Stock-Based Compensation Plans - Restricted Stock Activity (Details) - Restricted stock - $ / shares
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Restricted stock shares    
Equity instruments outstanding at the beginning of the period (in shares) 173,291  
Granted (in shares) 104,081 92,878
Vested (in shares) (86,369)  
Forfeited (in shares) (4,021)  
Equity instruments outstanding at the end of the period (in shares) 186,982  
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) 173.14  
Vested (in dollars per share) 194.67  
Forfeited (in dollars per share) 181.97  
Equity instruments outstanding at the end of the period (in dollars per share) $ 182.97