Stock Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity for the three-year period ended December 31, 2023:

	Number of shares			Weighted- average exercise price
Options outstanding - December 31, 2020		316,194		$	37.75
Options exercised		(88,932	)		22.89
Options outstanding - December 31, 2021		227,262		$	43.56
Options exercised		(25,986	)		27.04
Options forfeited		(4,529	)		60.82
Options outstanding - December 31, 2022		196,747		$	45.35
Options exercised		(30,433	)		31.77
Options outstanding - December 31, 2023		166,314		$	47.83
Exercisable options —
December 31, 2021		170,484		$	38.31
December 31, 2022		163,316			42.23
December 31, 2023		147,937			46.06

Schedule Share Based Compensation Intrinsic Value Of Stock Options Table Text Block

The following table summarizes the aggregate intrinsic value related to options exercised, outstanding and exercisable as of and for the years ended December 31:

	2023		2022		2021
	(In thousands)
Exercised	$	3,919	$	2,175	$	7,085
Outstanding		17,718		12,529		14,316
Exercisable		16,023		10,910		11,635

Schedule of Fair Value of Nonvested Shares

The fair value of nonvested shares is determined based on the market price of the shares on the grant date.

	Shares			Fair value per share
Nonvested at December 31, 2020		57,549		$	57.33
Granted		17,430			99.90
Vested		(16,528	)		49.31
Forfeited		(1,384	)		58.68
Nonvested at December 31, 2021		57,067		$	72.62
Granted		21,637			97.41
Vested		(23,302	)		66.87
Forfeited		(4,327	)		86.53
Nonvested at December 31, 2022		51,075		$	84.85
Granted		21,261			125.11
Vested		(30,408	)		75.97
Forfeited		(836	)		97.68
Nonvested at December 31, 2023		41,092		$	111.99

Summary of Performance Share Activity

A summary of performance share activity for the three years ended December 31 is as follows:

	Performance Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2020		—		$	—
Granted		14,748			100.37
Adjustment for expected performance results		7,374			100.37
Nonvested at December 31, 2021		22,122		$	100.37
Granted		16,870			97.62
Adjustment for expected performance results		6,746			97.62
Forfeited		(2,892	)		99.43
Nonvested at December 31, 2022		42,846		$	98.92
Granted		18,698			123.77
Adjustment for expected performance results		10,701			120.74
Nonvested at December 31, 2023		72,245		$	108.59