Stock Based Compensation (Schedule Of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation [Abstract]
Outstanding - beginning of period, Shares	203,864	160,733	123,631
Stock options granted, Shares	144,852	149,293	43,768
Exercised, Shares	(45,610)	(103,319)	(6,666)
Forfeited, Shares	(39,552)	(2,843)
Outstanding - end of period, Shares	263,554	203,864	160,733
Vested and expected to vest, Shares	263,554	203,864	160,733
Exercisable, Shares	101,165	73,071	62,486
Outstanding - beginning of period, Weighted Average Exercise Price	$ 14.02	$ 11.33	$ 10.76
Stock options granted, Weighted Average Exercise Price	$ 14.38	$ 14.83	$ 12.88
Exercised, Weighted Average Exercise Price	$ 14.85	$ 11.01	$ 10.78
Forfeited, Weighted Average Exercise Price	$ 14.33	$ 14.02
Outstanding - end of period, Weighted Average Exercise Price	$ 14.02	$ 14.02	$ 11.33