Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011
Cash dividends on common stock, per share	$ 0.20
Issuance of common stock dividend reinvestment plan, shares	6,748
Common Stock [Member]
Issuance of common stock dividend reinvestment plan, shares	6,748
Surplus [Member]
Issuance of common stock dividend reinvestment plan, shares	6,748
Retained Earnings [Member]
Cash dividends on common stock, per share	$ 0.20