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Stockholders' Equity and Stock Plans (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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