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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Stock Activity

A summary of all restricted stock/units activity as of December 31, 2016, 2017 and 2018 and changes during the years then ended are presented below.

			Number  of Shares						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life (years)						Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2015			145,588						$	19.17					9.12						$	3,246
Granted			139,451						$	21.34					—						$	3,007
Vested			(145,558)						$	19.17					—						$	2,963
Canceled/Forfeited			—						$	—					—						$	—
Outstanding, December 31, 2016			139,451						$	21.34					9.13						$	4,483
Granted			126,432						$	27.06					—						$	3,421
Vested			(81,494)						$	21.20					—						$	2,361
Canceled/Forfeited			—						$	—					—						$	—
Outstanding, December 31, 2017			184,389						$	25.32					8.83						$	4,831
Granted			140,988						24.55						—						3,461
Vested			(110,747)						23.97						—						2,806
Canceled/Forfeited			—						—						—						—
Outstanding, December 31, 2018			214,630						$	25.51					8.85						$	3,529

Stock Options Fair Value Assumptions

The fair value of each option award is estimated on the date of grant using the Black-Scholes option valuation model that uses the assumptions noted in the following table.  The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant.  The expected life of options granted is based on the vesting period and historical exercise and post-vesting employment termination behavior for similar grants.  We use historical data to estimate option exercise and employee termination within the valuation model; separate groups of employees that have similar historical exercise behavior are considered separately for valuation purposes.

Weighted average Black -Scholes fair value assumption during the year ended December 31, are as follows:												2017
Risk free rate												2.12		%
Expected life												6 years
Expected volatility												39.59		%
Expected dividend yield												—

Summary of Option Activity

A summary of all option activity as of December 31, 2016, 2017 and 2018  and changes during the years then ended are presented below:

			Number  of Shares						Weighted Average Grant Date Fair Value						Weighted Average Remaining Contractual Life (years)						Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2015			414,769						$	19.07					5.08						$	1,814
Granted			—						$	—
Exercised			(62,083)						$	16.79											625
Canceled/Forfeited			(2,500)						$	22.90											$	—
Outstanding, December 31, 2016			350,186						$	19.45					4.25						$	4,453
Granted			32,750						$	28.15
Exercised			(55,666)						$	20.12											446
Outstanding, December 31, 2017			327,270						$	20.21					4.28						$	2,255
Granted			—						—
Exercised			(38,250)						17.19												216
Canceled/Forfeited			(5,334)						24.02												—
Outstanding, December 31, 2018			283,686						$	20.46					3.58						$	434
Exercisable, December 31, 2018			262,821						$	19.85					3.22						$	434

Summary of Stock Options Outstanding

The following table summarizes information about our stock options outstanding at December 31, 2018:

Range of Exercise Prices						Options Outstanding																														Options Exercisable
									Shares						Weighted Average Remaining Contractual Life (years)						Weighted Average Exercise Price						Shares						Weighted Average Exercise Price
$0.01-15.70						64,852						0.52						$	9.75					64,852						$	9.75
$15.71-17.81						42,000						1.57						$	17.54					42,000						$	17.54
$17.82-20.48						50,500						2.34						$	19.43					50,500						$	19.43
$20.49-33.36						126,334						6.32						$	27.33					105,469						$	27.19
						283,686						3.58						$	20.46					262,821						$	19.85

Summary of the Status of Unvested Stock Options

The summary of the status of our unvested stock options as of December 31, 2018 and changes during the year then ended is presented below.

Unvested stock options:			Shares						Weighted Average Grant Date Fair Value
Unvested at December 31, 2017			48,581						$	11.41
Granted			—						$	—
Vested			(26,549)						$	10.97
Canceled/Forfeited			(1,167)						$	11.93
Unvested at December 31, 2018			20,865						$	11.93

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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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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.

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