Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012
Unrealized loss on available for sale marketable securities, taxes	$ 118,000
Stock tendered during period shares for redemption of stock options, shares	13,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions, shares	10,000
Cash dividends per common share	$ 0.49
Shares issued pursuant to Dividend Reinvestment Plan, shares	4,000
Shares issued pursuant to acquisition, shares	396,000