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Stock-Based Compensation Plans - Restricted Stock Granted (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted stock      
Restricted stock shares      
Outstanding at the beginning of the period (in shares) 157,066 131,724 148,326
Granted (in shares) 86,475 99,291 69,228
Vested (in shares) (78,212) (69,840) (79,931)
Forfeited (in shares) (3,615) (4,109) (5,899)
Outstanding at the ending of the period (in shares) 161,714 157,066 131,724
Restricted stock shares weighted average grant date fair value per share      
Outstanding at the beginning of the period (in dollars per share) $ 192.90 $ 203.28 $ 181.29
Granted (in dollars per share) 231.93 178.84 221.08
Vested (in dollars per share) 197.51 192.32 178.41
Forfeited (in dollars per share) 218.19 195.77 196.22
Outstanding at the ending of the period (in dollars per share) $ 210.97 $ 192.90 $ 203.28
Restricted stock converted from performance shares      
Restricted stock shares      
Outstanding at the beginning of the period (in shares) 74,627 146,319 163,111
Granted (in shares) 0 0 96,317
Vested (in shares) (48,171) (71,692) (111,325)
Forfeited (in shares) (86) 0 (1,784)
Outstanding at the ending of the period (in shares) 26,370 74,627 146,319