Stockholders' Equity (Details) (USD $)	1 Months Ended		3 Months Ended	12 Months Ended			1 Months Ended						12 Months Ended
	Oct. 31, 2011	Jun. 30, 2010	Mar. 31, 2012	Dec. 31, 2011 Fund	Dec. 31, 2010	Dec. 31, 2009	Jan. 31, 2011 Series B Preferred Stock	Dec. 31, 2011 Series B Preferred Stock	Dec. 31, 2011 Common Stock Voting	Dec. 31, 2010 Common Stock Voting	Dec. 31, 2011 Common Stock Non-Voting	Dec. 31, 2010 Common Stock Non-Voting	Dec. 31, 2011 Warrants [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares authorized				110,000,000					110,000,000	110,000,000	10,000,000	10,000,000
Series B Preferred Stock, shares authorized								35,000
Shares of common stock													3,500,000
Authorized a share repurchase program	$ 35,000,000	$ 30,000,000
Closing price of the common stock				17.50
Consecutive trading days				65 days
Shares of common stock							3,499,999
Common stock, shares issued									37,725,394	35,945,001	2,585,654	2,585,654
Common stock, shares issued													455,465
Shares conversion price				$ 10.00
Stockholders' Equity (Textual) [Abstract]
Aggregate purchase price				35,000,000
Common stock at an exercise price				10.00
Warrants to purchase shares, common stock				700,000
Placement agent fee and legal fees				33,500,000
Common stock entitles				One
Outstanding shares of common stock				9.99%
Common stock shares repurchased				237,998	1,939,620
Cost of common stock shares repurchased				$ 6,935,000	$ 30,000,000
Securities purchase agreement funds managed				2
Quarterly cash dividend			$ 0.11	$ 0.36	$ 0.28	$ 0.07