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Stockholders' Equity and Stock Plans (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Information of Cashless Exercise Prices

The table below depicts the total number of shares, amount, and weighted average price withheld for cashless exercises in each of the respective years.

			2021			2020			2019
Number of shares withheld			27,929			10,001			7,795
Total amount withheld (in thousands)			$	1,085		$	398		$	326
Weighted-average price			$	38.85		$	39.83		$	41.84

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity for the years ended December 31, 2021, 2020, and 2019 is presented in the following table. The intrinsic value of options outstanding and exercisable is calculated as the number of in-the-money options times the difference between the market price of our stock and the exercise prices of the in-the-money options as of each year-end period presented.

			Number of Shares			Weighted Average Exercise Price			Aggregate Intrinsic Value (in thousands)			Weighted Average Grant-Date Fair Value			Weighted Average Remaining Contractual Term (in years)
Options outstanding at December 31, 2018			425,700			$	25.01		$	6,910					5.85
Granted			53,370			44.01						$	9.37
Cancelled, expired or forfeited			(13,580)			38.88
Exercised			(48,108)			16.11			1,247
Options outstanding at December 31, 2019			417,382			28.01			7,112						5.50
Exercisable (vested) at December 31, 2019			333,870			25.34			6,581						4.76
Options outstanding at December 31, 2019			417,382			28.01			7,112						5.50
Granted			44,632			39.18						6.84
Cancelled, expired or forfeited			(17,222)			40.31
Exercised			(73,208)			22.26			1,370
Options outstanding at December 31, 2020			371,584			29.92			2,262						5.12
Exercisable (vested) at December 31, 2020			315,377			28.05			2,254						4.53
Options outstanding at December 31, 2020			371,584			29.92			2,262						5.12
Granted			55,861			36.39						8.84
Cancelled, expired or forfeited			(2,008)			42.50
Exercised			(60,056)			23.01			885
Options outstanding at December 31, 2021			365,381			31.97			2,326						5.57
Exercisable (vested) at December 31, 2021			315,744			30.85			2,264						5.15

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

A summary of the options outstanding and exercisable by price range as of December 31, 2021 is presented in the following table:

			Stock Options Outstanding as of December 31, 2021												Stock Options Exercisable as of December 31, 2021
Range of Exercise Prices			Stock Options Outstanding			Remaining Contractual Life (in years)			Weighted Average Exercise Price						Stock Options Exercisable			Weighted Average Exercise Price
$10.00 - $20.00			32,852			0.7			$	19.34					32,852			$	19.34
$20.01 - $30.00			102,374			3.4			$	24.47					102,374			$	24.47
$30.01 - $40.00			156,415			7.1			$	34.67					133,131			$	34.18
$40.01 - $50.00			73,740			7.5			$	42.29					47,387			$	42.62
			365,381												315,744

Schedule of Unrecognized Compensation Cost, Nonvested Awards

The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2021, 2020, and 2019.

			Number of Shares			Weighted Average Grant-Date Fair Value
Non-vested awards at December 31, 2018			87,388			$	31.26
Granted			29,110			44.45
Vested			(28,099)			27.88
Cancelled or forfeited			(18,333)			32.34
Non-vested awards at December 31, 2019			70,066			37.81
Granted			29,100			40.10
Vested			(23,524)			36.35
Cancelled or forfeited			(14,314)			37.63
Non-vested awards at December 31, 2020			61,328			39.50
Granted			30,742			38.00
Vested			(26,392)			36.81
Cancelled or forfeited			(3,848)			33.96
Non-vested awards at December 31, 2021			61,830			40.25

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

We determine the fair value of stock options at the grant date using the Black-Scholes pricing model that takes into account the stock price at the grant date, exercise price, and the following assumptions (weighted-average shown).

			Years ended December 31,
			2021			2020			2019
Risk-free interest rate			0.98		%	0.91		%	2.51		%
Expected dividend yield on common stock			2.57		%	2.38		%	1.75		%
Expected life in years			6.1			6.1			5.8
Expected price volatility			33.12		%	24.43		%	22.71		%

Summary of Cash Dividends Paid to Common Shareholders

Presented below is a summary of cash dividends paid in 2021, 2020 and 2019 to common shareholders, recorded as a reduction from retained earnings. On January 21, 2022, the Board of Directors declared a $0.24 per share cash dividend, paid February 11, 2022 to the shareholders of record at the close of business on February 4, 2022.

			Years ended December 31,
(in thousands except per share data)			2021			2020			2019
Cash dividends to common stockholders			$	13,107		$	12,506		$	10,958
Cash dividends per common share			$	0.94		$	0.92		$	0.80

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Share-based Payment Arrangement, Share Information about Cashless Exercises

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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