Condensed Consolidated Statements of Income Parenthetical (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Average common shares outstanding	12,973	[1]	12,874	[1]	12,996	[1]	12,883	[1]
Cash dividends declared	$ 3,896		$ 3,519		$ 11,729		$ 10,572
Scenario, Previously Reported [Member]
Average common shares outstanding			11,704				11,712

[1] (A)Adjusted for the declaration of a ten percent (10%) stock dividend in 2011, shares related to which were issued in February 2012. Prior to the adjustment, the average common shares outstanding were 11,704 and 11,712 for the three and nine months ended September 30, 2011, respectively.