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Share-Based Compensation Plans - Company's stock option activity (Details) - Employee stock option
 6 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
shares
Share-Based Compensation Plans  
Shares, Outstanding at beginning of period | shares 1,345,369
Shares, Exercised | shares (333,009)
Shares, Forfeited or expired | shares (3,720)
Shares, Outstanding at end of period | shares 1,008,640
Shares, Exercisable at end of period | shares 558,104
Weighted Average Exercise Price, Outstanding at beginning of period (in dollars per share) $ 25.83
Weighted Average Exercise Price, Exercised (in dollars per share) 25.40
Weighted Average Exercise Price, Forfeited or expired (in dollars per share) 27.50
Weighted Average Exercise Price, Outstanding at end of period (in dollars per share) 25.97
Weighted Average Exercise Price, Exercisable at end of period (in dollars per share) $ 26.92
Weighted Average Remaining Contractual Term (Years), Outstanding 6 years 1 month 6 days
Weighted Average Remaining Contractual Term (Years), Exercisable, Outstanding 4 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding | $ $ 2,484,000
Aggregate Intrinsic Value, Exercisable | $ $ 1,106,000
Fair market value of options granted (in dollars per share) $ 26.69