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Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2023

Stock Compensation Plans

Schedule of share-based compensation, stock options, activity

​

​	​	​	​	​	​	​	​
​		​		Shares		Weighted
​	​	Available	​	Under	​	Average
​	​	to Grant	​	Option	​	Exercise Price
​	​	​	​	​	​	​	​
Balance, January 1, 2021	​	245,350	​	971,107	​	$	48.079
Granted from 2018 Plan		(202,700)		202,700		​	57.980
Exercised		—		(91,285)		​	40.532
Forfeited from terminated plan(s)		—		(5,197)		​	44.563
Forfeited from current plan(s)		44,022		(44,022)		​	52.256
​	​	​	​	​	​	​	​
Balance, December 31, 2021		86,672		1,033,303		​	50.528
Granted from 2018 Plan		(2,500)		2,500		​	61.550
Forfeited from terminated plan(s)		39,235		(39,235)		​	52.523
Termination of 2018 Plan		(123,407)		—		​	—
Available to Grant from 2022 Plan		900,000		—		​	—
Granted from 2022 Plan		(205,900)		205,900		​	61.505
Exercised		—		(136,801)		​	42.149
Forfeited from current plan(s)		750		(750)		​	61.550
​	​	​	​	​	​	​	​
Balance, December 31, 2022		694,850		1,064,917		​	53.671
Forfeited from terminated plan(s)	​	—	​	(9,100)	​	​	51.123
Granted from 2022 Plan	​	(210,300)	​	210,300	​	​	53.166
Exercised		—		(22,762)		​	38.830
Forfeited from current plan(s)		3,050		(3,050)		​	61.550
​	​	​	​	​	​	​	​
Balance, December 31, 2023		487,600		1,240,305	​	$	53.857

Schedule of fair value option pricing model assumptions

​

​	​	​	​	​	​	​	​	​	​	​
​		2023			2022			2021
​	​	​	​	​	​	​	​	​	​
Expected dividends per share	​	$	1.60	​	$	1.60	​	$	1.44
Risk-free interest rate		​	4.51	%	​	3.77	%	​	1.24	%
Expected life of options		​	6 years	​	​	6 years	​	​	5 years	​
Expected volatility		​	23.69	%	​	23.70	%	​	28.33	%
Weighted average fair value of options granted during year	​	$	11.69	​	$	13.46	​	$	11.56	​

Schedule of share-based compensation, activity

​

​	​	​	​	​	​	​	​
​		​		​	​		Weighted
​	​	​	​	Weighted		​	Average
​	​	​	​	Average		​	Remaining
​	​	​	​	Exercise		​	Contractual
​		Options		Price			Term
​	​	​	​	​	​	​	​
Options outstanding, January 1, 2023		1,064,917	​	$	53.671		7.13 years
Granted		210,300	​	​	53.166		​
Exercised		(22,762)	​	​	38.830		​
Forfeited		(12,150)	​	​	53.741		​
Options outstanding, December 31, 2023		1,240,305	​	​	53.857		6.74 years
​	​	​	​	​	​	​	​
Options exercisable, December 31, 2023		571,490	​	$	51.688		4.64 years

Schedule of nonvested share activity

​

​	​	​	​	​	​	​	​	​
​		​		Weighted			Weighted
​	​	​	​	Average		​	Average
​	​	​	​	Exercise		​	Grant Date
​		Options		Price			Fair Value
​	​	​	​	​	​	​	​	​
Nonvested options, January 1, 2023		636,844	​	$	56.073	​	$	11.117
Granted		210,300	​	​	53.166	​	​	11.681
Vested this period		(169,592)	​	​	53.882	​	​	9.755
Nonvested options forfeited		(8,737)	​	​	56.347	​	​	11.299
​	​	​	​	​	​	​	​	​
Nonvested options, December 31, 2023		668,815	​	$	55.711	​	$	11.640

Schedule of share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable

The following table further summarizes information about stock options outstanding at December 31, 2023:

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

Options Outstanding

​

​

​

​

​

Weighted

​

​

​

​

Options Exercisable

​

​

​

​

Average

​

Weighted

​

​

​

Weighted

​

​

​

​

Remaining

​

Average

​

​

​

Average

​

​

Number

​

Contractual

​

Exercise

​

Number

​

Exercise

Range of Exercise Prices

Outstanding

Term

Price

Exercisable

Price

​

​

​

​

​

​

​

​

​

​

​

​

​

$32.590 to 38.610

26,906

0.96 years

​

$

33.317

26,906

​

$

33.317

$41.300 to 41.740

200,538

5.71 years

​

41.628

119,930

​

41.552

$50.250 to 59.750

668,327

6.87 years

​

54.686

316,725

​

54.194

$60.150 to 62.010

344,534

7.55 years

​

60.971

107,929

​

60.176

​

​

​

​

​

​

​

​

​

​

​

​

​

​

1,240,305

6.74 years

​

$

53.857

571,490

​

$

51.688

​

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