Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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

Components of Share Based Compensation Awards

The following table summarizes the components of the Corporation's share-based compensation awards recorded as expense:

	Years Ended December 31,
	2016			2015			2014
Stock and ESPP Options
Pre-tax compensation expense	$	76		$	101		$	237
Income tax expense (benefit)	18			4			(47		)
Stock and ESPP option expense, net of income taxes	$	94		$	105		$	190
Restricted Stock Awards
Pre-tax compensation expense	$	2,524		$	2,169		$	1,940
Income tax benefit	(883		)	(749		)	(679		)
Restricted stock awards expense, net of income taxes	$	1,641		$	1,420		$	1,261
Total Share-Based Compensation:
Pre-tax compensation expense	$	2,600		$	2,270		$	2,177
Income tax benefit	(865		)	(745		)	(726		)
Total share-based compensation expense, net of income taxes	$	1,735		$	1,525		$	1,451

Stock Option Activity Under Stock Option Plans

Stock option activity under the Corporation's stock option plans, as of December 31, 2016, and changes during the year ended December 31, 2016, were as follows:

	Number of Shares		Weighted-Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2016	442,012		$	19.99
Exercised	(128,848	)	$	19.37
Canceled	(52,953	)	$	25.09
Outstanding December 31, 2016	260,211		$	19.26	2.71	$	4,785,982
Vested and Expected to Vest at December 31, 2016	260,211		$	19.26	2.71	$	4,785,982
Exercisable at December 31, 2016	260,211		$	19.26	2.71	$	4,785,982

Summary of Unvested RSAs Outstanding

The following table summarizes information on unvested RSAs outstanding as of December 31, 2016:

	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested RSAs at January 1, 2016	354,504		$	19.65
Granted	124,563		$	24.01
Forfeited	(9,594	)	$	21.99
Vested	(141,126	)	$	16.62
Unvested RSAs at December 31, 2016	328,347		$	22.87