Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Common Stock, Dividends, Per Share, Declared	$ 0.17	$ 0.27
Treasury shares issued under stock option plan, shares	204
Common Stock [Member]
Common stock issued under dividend reinvestment plan, shares	12,633	34,193