Condensed Consolidated Statements of Income Condensed Consolidated Statements of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Common stock, stock dividend rate			2.50%
Average common shares outstanding (Shares)	15,799	[1]	15,895	[1]	15,861	[1]	15,954	[1]
Cash dividends declared	$ 4,754		$ 4,665		$ 14,302		$ 14,041
Scenario, Previously Reported
Average common shares outstanding (Shares)			15,507				15,565

[1] Adjusted for the declaration of a two and a half percent (2.5%) stock dividend in 2013, shares related to which were issued in February 2014. Prior to the adjustment, the average common shares outstanding were 15,507 and 15,565 for the three and nine months ended September 30, 2013, respectively.