Stock Based Compensation (Tables)

9 Months Ended

Sep. 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				Nine Months Ended
	September 30,				September 30,
	2014		2013		2014		2013
Stock options	$	171	$	140	$	492	$	378
Nonvested stock awards and restricted stock units		593		461		1,758		1,372
Employee stock purchase plan		18		17		54		43
Non-elective and elective 401(k) matching contribution in stock		413		347		1,561		1,283
Director stock ownership plan		32		16		94		57
Total share-based compensation expense	$	1,227	$	981	$	3,959	$	3,133

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 September 30, 2014		109,007	$	54.41		5.1
Options exercisable at September 30, 2014		40,628	$	39.76		4.0

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 9/30/2014	Life	Price		9/30/2014	Price
$	0.00	-	$	10.00	0	0	$	0	0	$	0
$	10.01	-	$	20.00	6,155	2.3		18.82	6,155		18.82
$	20.01	-	$	30.00	0	0		0	0		0
$	30.01	-	$	40.00	35,020	4.1		37.87	23,954		37.75
$	40.01	-	$	50.00	2,192	4.7		46.21	1,462		46.21
$	50.01	-	$	60.00	28,592	5.4		58.26	9,057		58.26
$	60.01	-	$	70.00	0	0.0		0	0		0
$	70.01	-	$	80.00	37,048	6.4		73.47	0		0
					109,007	5.1		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	55,258	$	73.80
	Vested	(42,223)	$	40.51
	Forfeited	(3,895)	$	37.01
Nonvested awards, September 30, 2014		125,124	$	61.59

			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, September 30, 2014		7,158	$	61.03