Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash dividends paid on common shares, per share	$ 0.105	$ 0.105
Issuance under equity compensation plans, shares	83,189	105,417
Issuance under public stock offering, shares		2,743,900