Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Share Based Compensation [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2014		2013		2014		2013
Stock options	$	171	$	138	$	321	$	238
Nonvested stock awards and restricted stock units		609		528		1,165		911
Employee stock purchase plan		19		14		36		26
Non-elective and elective 401(k) matching contribution in stock		499		411		1,148		936
Director stock ownership plan		46		21		62		41
Total share-based compensation expense	$	1,344	$	1,112	$	2,732	$	2,152

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

					Weighted
					Average
			Weighted Average		Remaining
		Number of	Exercise Price per		Contractual
		Shares	Share		Term (years)
Options outstanding at December 31, 2013		75,251	$	44.49
	Options granted	37,048		73.47
	Options exercised	(3,292)		42.24
Options outstanding at June 30, 2014		109,007	$	54.41		5.4
Options exercisable at June 30, 2014		40,628	$	39.76		4.3

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

						Weighted	Weighted		Number	Weighted
					Number	Average	Average		Exercisable	Average
Range of					Outstanding	Contractual	Exercise		at	Exercise
Exercise Prices					at 6/30/2014	Life	Price		6/30/2014	Price
$	0.00	-	$	10.00	0	0	$	0	0	$	0
$	10.01	-	$	20.00	6,155	2.6		18.82	6,155		18.82
$	20.01	-	$	30.00	0	0		0	0		0
$	30.01	-	$	40.00	35,020	4.3		37.87	23,954		37.75
$	40.01	-	$	50.00	2,192	5.0		46.21	1,462		46.21
$	50.01	-	$	60.00	28,592	5.7		58.26	9,057		58.26
$	60.01	-	$	70.00	0	0.0		0	0		0
$	70.01	-	$	80.00	37,048	6.7		73.47	0		0
					109,007	5.4		54.41	40,628		39.76

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2014
Number of options granted	37,048
Dividend yield	2.00	%
Expected volatility	43.34	%
Risk-free interest rate	1.22	%
Expected term (years)	4.0

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

		Weighted
		Average Grant
	Number of	Date Fair Value
	Shares	(per share)
Nonvested awards, December 31, 2013	115,984	$	47.27
Granted	28,344	$	73.32
Vested	(29,973)	$	44.32
Nonvested awards, June 30, 2014	114,355	$	54.50

		Weighted
		Average Grant
	Number of	Date Fair Value
	units	(per unit)
Nonvested awards, December 31, 2013	4,018	$	49.71
Granted	3,140	$	75.52
Nonvested awards, June 30, 2014	7,158	$	61.03