Share-Based Compensation Plans - Company's stock option activity (Details)	9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares
Share-Based Compensation Plans
Market value of common stock (in dollars per share)	$ 34.04
Employee Stock Option
Share-Based Compensation Plans
Shares, Outstanding at beginning of period | shares	967,217
Shares, Exercised | shares	(105,072)
Shares, Forfeited or expired | shares	(11,680)
Shares, Outstanding at end of period | shares	850,465
Shares, Exercisable at end of period | shares	567,574
Weighted Average Exercise Price, Outstanding at beginning of period (in dollars per share)	$ 26.22
Weighted Average Exercise Price, Exercised (in dollars per share)	24.64
Weighted Average Exercise Price, Forfeited or expired (in dollars per share)	25.76
Weighted Average Exercise Price, Outstanding at end of period (in dollars per share)	26.41
Weighted Average Exercise Price, Exercisable at end of period (in dollars per share)	$ 26.88
Weighted Average Remaining Contractual Term (Years), Outstanding	6 years 1 month 6 days
Weighted Average Remaining Contractual Term (Years), Exercisable, Outstanding	5 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding | $	$ 6,851,000
Aggregate Intrinsic Value, Exercisable | $	$ 4,426,000