Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 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]

	March 31,
	2014		2013
Stock options	$	150	$	100
Nonvested stock awards and restricted stock units		556		383
Employee stock purchase plan		17		12
Non-elective and elective 401(k) matching contribution in stock		649		525
Director stock ownership plan		16		20
Total share-based compensation expense	$	1,388	$	1,040

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 March 31, 2014		109,007	$	54.41		5.6
Options exercisable at March 31, 2014		39,897	$	39.64		4.5

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 3/31/2014	Life	Price		3/31/2014	Price
$	0.00	-	$	10.00	0	0	$	0	0	$	0
$	10.01	-	$	20.00	6,155	2.8		18.82	6,155		18.82
$	20.01	-	$	30.00	0	0		0	0		0
$	30.01	-	$	40.00	35,020	4.6		37.87	23,954		37.75
$	40.01	-	$	50.00	2,192	5.2		46.21	731		46.21
$	50.01	-	$	60.00	28,592	5.9		58.26	9,057		58.26
$	60.01		$	70.00	0	0		0	0		0
$	70.01		$	80.00	37,048	6.9		73.47	0		0
					109,007	5.6		54.41	39,897		39.64

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	22,656	$	73.37
Vested	(22,325)	$	38.44
Nonvested awards, March 31, 2014	116,315	$	54.05

		Weighted
		Average Grant
	Number of	Date Fair Value
	units	(per unit)
Nonvested awards, December 31, 2013	4,018	$	49.71
Granted	2,140	$	74.89
Nonvested awards, March 31, 2014	6,158	$	58.46