Basis of Accounting and Consolidation Basis of Accounting and Consolidation 2 (Details) (USD $)			9 Months Ended	12 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Series B Convertible Preferred Stock [Member]	Dec. 31, 2009 Series B Convertible Preferred Stock [Member] director dividend_period	Sep. 30, 2008 Series B Convertible Preferred Stock [Member]	Sep. 30, 2012 Series C Convertible Preferred Stock [Member] director dividend_period	Jun. 28, 2012 Series C Convertible Preferred Stock [Member]	Dec. 31, 2011 Series C Convertible Preferred Stock [Member]	May 13, 2011 Series C Convertible Preferred Stock [Member]	Mar. 02, 2011 Series C Convertible Preferred Stock [Member] investors	Feb. 11, 2011 Series C Convertible Preferred Stock [Member]	Dec. 31, 2010 Series C Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Abstract]
Preferred stock issue price (in dollars per share)				$ 5,000							$ 5,000
Number of dividend periods				4		4
Number of Directors to be Elected by Holders of Preferred Stock				2		2
Liquidation preference per share (in dollars per share)			$ 5,000			$ 0
Preferred stock, conversion price per share (in dollars per share)				$ 21.94		$ 20.29
Preferred stock, redemption price per share (in dollars per share)			$ 5,000			$ 5,000
Percentage of common stock book value required for the conversion of preferred stock (in hundredths)					115.00%
Common Stock, Book Value (in dollars per share)			$ 17.53		$ 13.03
115% of common stock book value (in dollars per share)					$ 14.98
Preferred stock, revised conversion price per share (in dollars per share)			$ 21.62
Proceeds from Issuance of Convertible Preferred Stock				24,635,000		27,500,000
Preferred Stock, Dividend Rate, Percentage (in hundredths)				9.00%		8.00%
Series C Convertible Preferred Stock [Abstract]
Preferred Stock, shares subscribed, value											27,500,000
Number of Investors Completing the Required Bank Regulatory Process									4	3
Preferred Stock issued during period, value	52,035,000	43,785,000					8,250,000	19,250,000	5,490,000	2,750,000	11,010,000
Percentage of common stock tangible book value required for the conversion of common stock (in hundredths)						115.00%
Tangible book value per share of common stock (in dollars per share)						$ 12.71						$ 9.38
115% of common stock tangible book value (in dollars per share)												$ 10.79
Percentage of the NASDAQ Bank Index required for the conversion of Series C Preferred Stock (in hundredths)						115.00%
NASDAQ Bank Index						1,888.14						1,847.35
115% of NASDAQ Bank Index												2,124.45
Proceeds from Issuance of Convertible Preferred Stock				$ 24,635,000		$ 27,500,000
Preferred Stock, Dividend Rate, Percentage (in hundredths)				9.00%		8.00%