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Stockholders' Equity and Stock Plans (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

A summary of activity for stock options for the years ended December 31, 2017, 2016 and 2015 is presented below. 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 as of each year-end presented and the exercise prices of the in-the-money options.

	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, 2014	194,672		$	35.14		$	3,398					4.48
Granted	28,320		50.70						$	12.21
Cancelled, expired or forfeited	(652	)	48.38
Exercised	(37,071	)	30.72			755
Options outstanding at December 31, 2015	185,269		38.35			2,788						5.00
Exercisable (vested) at December 31, 2015	114,581		34.12			2,209						3.21
Options outstanding at December 31, 2015	185,269		38.35			2,788						5.00
Granted	32,637		49.37						10.11
Exercised	(36,117	)	33.98			661
Options outstanding at December 31, 2016	181,789		41.20			5,190						5.77
Exercisable (vested) at December 31, 2016	103,211		36.65			3,416						4.18
Options outstanding at December 31, 2016	181,789		41.20			5,190						5.77
Granted 1	100,664		39.78						32.61
Cancelled, expired or forfeited	(2,011	)	43.97
Exercised	(21,474	)	38.62			585
Options outstanding at December 31, 2017	258,968		40.84			7,075						5.34
Exercisable (vested) at December 31, 2017	192,172		35.69			6,212						4.42

¹ Includes 70,145 replacement stock option awards issued in the Acquisition with a $27.20 weighted average exercise price and a $40.71 weighted average grant-date fair value. See Note 18, Acquisition.

Schedule of Unrecognized Compensation Cost, Nonvested Awards

The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2017, 2016 and 2015.

	Number of Shares		Weighted Average Grant-Date Fair Value
Non-vested awards at December 31, 2014	22,423		$	41.25
Granted	15,970		50.75
Vested	(6,555	)	40.00
Forfeited	(450	)	48.45
Non-vested awards at December 31, 2015	31,388		46.24
Granted	16,910		49.65
Vested	(8,599	)	44.14
Non-vested awards at December 31, 2016	39,699		48.15
Granted	16,230		69.59
Vested	(10,321	)	45.78
Non-vested awards at December 31, 2017	45,608		56.31

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, 2017 is presented in the following table:

	Stock Options Outstanding as of December 31, 2017							Stock Options Exercisable as of December 31, 2017
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	14,120		2.1	$	17.74			14,120		$	17.74
$20.01 - $30.00	51,731		1.1	26.05				51,731		26.05
$30.01 - $40.00	70,363		5.3	35.53				68,238		35.41
$40.01 - $50.00	64,511		7.1	46.14				33,224		44.73
$50.01 - $60.00	27,724		6.9	50.70				18,200		50.70
$60.01 - $70.00	30,519		9.3	68.68				6,659		65.46
	258,968							192,172

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, the exercise price, and the following assumptions (weighted-average shown).

	Years ended December 31,
	2017		2016		2015
Risk-free interest rate	1.66	%	1.37	%	1.67	%
Expected dividend yield on common stock	1.70	%	2.02	%	1.75	%
Expected life in years	2.4		6.0		6.0
Expected price volatility	25.58	%	25.56	%	28.06	%

Summary of Cash Dividends Paid to Common Shareholders

Presented below is a summary of cash dividends paid to common shareholders, recorded as a reduction of retained earnings. On January 19, 2018, the Board of Directors declared a cash dividend of $0.29 per share, payable on February 9, 2018 to shareholders of record at the close of business on February 2, 2018.

	Years ended December 31,
(in thousands except per share data)	2017			2016			2015
Cash dividends to common stockholders	$	6,896		$	6,223		$	5,390
Cash dividends per common share	$	1.12		$	1.02		$	0.90

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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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