Consolidated Statement of Changes in Shareholders Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012
Cash dividends per share	$ 0.62
Grant of restricted stock	52,700
Common stock options exercised,shares	7,510
Common Stock
Distribution of treasury stock for deferred compensation plan, shares	2,937
Purchase of treasury stock, Shares	226
Cash dividends per share	$ 0.62
Grant of restricted stock	52,700
Common stock options exercised,shares	7,510
Balance, shares	50,867,630
Treasury Stock
Distribution of treasury stock for deferred compensation plan, shares	2,937
Purchase of treasury stock, Shares	226