Stock Based Compensation Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares Outstanding, Outstanding Options, in shares	389,392
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	5 years 6 months 27 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$ 22.89
Number of Shares Outstanding, Exercisable Options, in shares	269,758
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	4 years 8 months 5 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$ 22.29
Exercise Price Range $19.08 to $19.87 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares Outstanding, Outstanding Options, in shares	85,278
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	4 years 8 months 22 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$ 19.64
Number of Shares Outstanding, Exercisable Options, in shares	85,278
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	4 years 8 months 22 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$ 19.64
Exercise Price Range $21.24 to $22.27 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares Outstanding, Outstanding Options, in shares	98,376
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	5 years 1 month 11 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$ 21.95
Number of Shares Outstanding, Exercisable Options, in shares	81,150
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	4 years 10 months 25 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$ 21.88
Exercise Price Range $23.76 to $23.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares Outstanding, Outstanding Options, in shares	83,015
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	7 years 4 months 3 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$ 23.77
Number of Shares Outstanding, Exercisable Options, in shares	36,391
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	7 years 1 month 3 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$ 23.77
Exercise Price Range $24.43 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares Outstanding, Outstanding Options, in shares	75,512
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	8 years 0 months 19 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$ 24.43
Number of Shares Outstanding, Exercisable Options, in shares	19,728
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	7 years 11 months 10 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$ 24.42
Exercise Price Range $25.77 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares Outstanding, Outstanding Options, in shares	47,211
Weighted-Average Remaining Contractual Life, Outstanding Options, in years	0 years 11 months 20 days
Weighted Average Exercise Price, Outstanding Options, in Weighted Average Exercise Price	$ 25.77
Number of Shares Outstanding, Exercisable Options, in shares	47,211
Weighted-Average Remaining Contractual Life, Exercisable Options, in years	0 years 11 months 20 days
Weighted-Average Exercise Price, Exercisable Options, in Weighted Average Exercise Price	$ 25.77