Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013
Cash dividends per share	$ 0.93
Common stock options exercised, shares	70,570
Common Stock [Member]
Grant of restricted stock, shares	52,825
Forfeiture of restricted stock, shares	1,296
Common stock options exercised, shares	70,570
Treasury Stock [Member]
Distribution of treasury stock for deferred compensation plan, shares	3,824
Purchase of treasury stock, shares	1,552