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Stockholders' Equity and Stock Plans (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

A summary of activity for stock options for the years ended December 31, 2016, 2015 and 2014 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, 2013	220,456		$	32.74		$	2,349					4.05
Granted	26,421		44.83						$	12.04
Cancelled, expired or forfeited	(2,790	)	39.01
Exercised	(49,415	)	29.39			771
Options outstanding at December 31, 2014	194,672		35.14			3,398						4.48
Exercisable (vested) at December 31, 2014	133,153		32.31			2,701						2.88
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

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding

The following table shows the number, weighted average exercise price, intrinsic value, and weighted average remaining contractual life of options outstanding, vested and expected to vest as of December 31, 2016.

Number of options	177,122
Weighted average exercise price	$	41.03
Aggregate intrinsic value (in thousands)	$	5,086
Weighted average remaining contractual term (in years)	5.71

Schedule of Unrecognized Compensation Cost, Nonvested Awards

The following table summarizes non-vested restricted stock awards and changes during the years ended December 31, 2016, 2015 and 2014.

	Restricted Stock Awards
	Number of Shares		Weighted Average Grant-Date Fair Value
Non-vested awards at December 31, 2013	22,521		$	37.59
Granted	8,523		45.36
Vested	(6,554	)	34.65
Forfeited	(2,067	)	39.32
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

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, 2016 is presented in the following table:

	Stock Options Outstanding as of December 31, 2016							Stock Options Exercisable as of December 31, 2016
Range of Exercise Prices	Stock Options Outstanding		Remaining Contractual Life (in years)	Weighted Average Exercise Price				Stock Options Exercisable		Weighted Average Exercise Price
$20.00 - $25.00	13,138		2.3	$	22.25			13,138		$	22.25
$25.01 - $30.00	10,180		1.3	28.75				10,180		28.75
$30.01 - $35.00	9,195		3.3	33.10				9,195		33.10
$35.01 - $40.00	46,588		4.1	37.70				39,038		37.48
$40.01 - $45.00	29,551		5.9	41.95				17,130		41.91
$45.01 - $50.00	45,187		8.7	48.40				5,020		45.88
$50.01 - $55.00	27,950		7.9	50.70				9,510		50.69
	181,789							103,211

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,
	2016		2015		2014
Risk-free interest rate	1.37	%	1.67	%	2.04	%
Expected dividend yield on common stock	2.02	%	1.75	%	1.70	%
Expected life in years	6.0		6.0		6.0
Expected price volatility	25.56	%	28.06	%	30.32	%

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 20, 2017, the Board of Directors declared a cash dividend of $0.27 per share, payable on February 10, 2017 to shareholders of record at the close of business on February 3, 2017.

	Years ended December 31,
(in thousands except per share data)	2016			2015			2014
Cash dividends to common stockholders	$	6,223		$	5,390		$	4,733
Cash dividends per common share	$	1.02		$	0.90		$	0.80

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