Condensed Consolidated Statements of Income Parenthetical (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Stock Dividend			20.00%
Average common shares outstanding	15,634	[1]	15,614	[1]
Cash dividends declared	$ 4,700		$ 3,921
Scenario, Previously Reported [Member]
Average common shares outstanding			13,012

[1] (A)Adjusted for the declaration of a twenty percent (20%) stock dividend in 2012, shares related to which were issued in February 2013. Prior to the adjustment, the average common shares outstanding were 13,012 for the three months ended March 31, 2012.