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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

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

Schedule of unvested restricted stock awards

The following tables summarize the unvested restricted stock awards at December 31, 2018 and 2017. 

		2018								2017
Perfomance Awards		Shares				Weighted-Average Grant Date Fair Value				Shares				Weighted-Average Grant Date Fair Value
Unvested at beginning			62,338			$	50.45				33,226			$	42.60
Issued			42,533				60.45				36,523				57.49
Forfeited			(5,913	)			50.28				(2,520	)			41.93
Vested			—				—				(4,891	)			54.70
Unvested at end			98,958			$	54.76				62,338			$	50.45

		Year Ended December 31,
		2018								2017
Time Vested Awards		Shares				Weighted-Average Grant Date Fair Value				Shares				Weighted-Average Grant Date Fair Value
Unvested at beginning			164,043			$	53.57				262,966			$	33.60
Issued			94,344				60.45				91,097				62.70
Forfeited			(7,132	)			56.48				(2,360	)			49.52
Vested			(77,534	)			49.67				(187,660	)			30.07
Unvested at end			173,721			$	58.93				164,043			$	53.57

Schedule of activity of stock options

Below is a summary of stock option activity for the twelve months ended December 31, 2018, 2017 and 2016. The information excludes restricted stock units and awards.

		Year Ended December 31,
		2018								2017								2016
		Shares				Weighted-Average Exercise Price				Shares				Weighted-Average Exercise Price				Shares				Weighted-Average Exercise Price
Beginning balance			143,224			$	9.13				216,859			$	8.80				298,740			$	9.97
Issued			—				—				—				—				3,000				49.49
Exercised			(108,201	)			7.17				(72,535	)			8.19				(77,144	)			14.48
Forfeited			(900	)			34.47				—				—				(1,100	)			15.48
Expired			—				—				(1,100	)			5.76				(6,637	)			12.87
Ending balance			34,123			$	14.69				143,224			$	9.13				216,859			$	8.80

Schedule of stock option by exercise price range

The following summarizes information about stock options outstanding at December 31, 2018. The information excludes restricted stock units and awards.

												Weighted-Average
Outstanding:				Stock Options				Weighted-Average				Remaining
Range of Exercise Prices				Outstanding				Exercise Price				Contractual Life
$5.76		$10.72			22,024			$	5.76				0.02
$10.73		$11.40			5,089				11.17				2.88
$11.41		$24.86			660				20.03				4.06
$24.87		$49.91			6,350				47.91				3.66
					34,123			$	14.69				1.20

Exercisable:				Stock Options				Weighted-Average
Range of Exercise Prices				Exercisable				Exercise Price
$5.76		$10.72			4,675			$	5.76
$10.73		$11.40			5,089				11.17
$11.41		$24.86			660				20.03
$24.87		$49.91			4,850				47.42
					15,274			$	21.41

Schedule of valuation assumptions used for stock options

The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option pricing model with the assumptions as shown in the table below used for grants during the years ended December 31, 2018, 2017 and 2016.

		Years Ended December 31,
		2018				2017				2016
Expected volatility			n/a				n/a				24.23	%
Weighted-Average volatility			n/a				n/a				24.23	%
Expected dividends			—				—				—
Expected term (in years)			n/a				n/a				7.0
Risk-free rate			n/a				n/a				1.37	%
Weighted-average fair value (grant date)			n/a				n/a			$	14.27

Schedule of cash proceeds, tax benefits and intrinsic value related to total stock options exercised

Cash proceeds, tax benefits and intrinsic value related to total stock options exercised is as follows:

		Years Ended December 31,
(dollars in thousands)		2018				2017				2016
Proceeds from stock options exercised		$	776			$	372			$	955
Tax benefits realized from stock compensation			5				99				400
Intrinsic value of stock options exercised			4,958				3,888				2,824

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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