Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividend declared per common share	$ 0.22	$ 0.20	$ 0.20
Common Stock
Issuance of restricted stock, shares	18,525	18,325	12,230
Restricted common stock, per share issue price	$ 12.70	$ 10.10	$ 7.40
Forfeiture of restricted stock, shares	643	1,018	560
Additional Paid-In Capital
Issuance of restricted stock, shares	18,525	18,325	12,230
Restricted common stock, per share issue price	$ 12.70	$ 10.10	$ 7.40
Forfeiture of restricted stock, shares	643	1,018	560
Retained Earnings
Dividend declared per common share	$ 0.22	$ 0.20	$ 0.20