Summary of Significant Accounting Policies Summary of Significant Accounting Policies 2 (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010 director dividend_period	Dec. 31, 2009	Nov. 17, 2014	Sep. 30, 2008	Jun. 28, 2012	May 13, 2011	Mar. 02, 2011 investors	Feb. 11, 2011
Series B Convertible Preferred Stock [Abstract]
Convertible Preferred Stock, Shares Issued upon Conversion							231.267
Proceeds from issuance of preferred stock		$ 0	$ 0	$ 8,250,000
Conversion of Stock, Shares Issued	1,139,195
Series C Convertible Preferred Stock [Abstract]
Preferred Stock issued during period, value	27,400,000	27,400,000	52,035,000
Proceeds from issuance of preferred stock		0	0	8,250,000
Series B Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Abstract]
Preferred stock issue price (in dollars per share)					$ 5,000
Number of dividend periods					4
Number of Directors to be Elected by Holders of Preferred Stock					2
Liquidation preference per share (in dollars per share)	5,000	5,000
Preferred stock, conversion price per share (in dollars per share)					$ 21.94
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)	$ 19.55	$ 19.55						$ 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
Preferred Stock, Shares Outstanding							4,926
Proceeds from issuance of preferred stock						24,635,000
Preferred Stock, Dividend Rate, Percentage (in hundredths)					9.00%
Series C Convertible Preferred Stock [Abstract]
Proceeds from issuance of preferred stock						24,635,000
Preferred Stock, Dividend Rate, Percentage (in hundredths)					9.00%
Series C Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Abstract]
Preferred stock issue price (in dollars per share)												$ 5,000
Number of dividend periods		4
Number of Directors to be Elected by Holders of Preferred Stock		2
Liquidation preference per share (in dollars per share)	5,000	5,000
Preferred stock, conversion price per share (in dollars per share)		$ 20.29
Preferred stock, redemption price per share (in dollars per share)	$ 5,000	$ 5,000
Proceeds from issuance of preferred stock		27,500,000
Preferred Stock, Dividend Rate, Percentage (in hundredths)		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									8,250,000	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)	$ 15.63	$ 15.63		$ 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	2,675.88	2,675.88		1,847.35
115% of NASDAQ Bank Index				2,124.45
Proceeds from issuance of preferred stock		$ 27,500,000
Preferred Stock, Dividend Rate, Percentage (in hundredths)		8.00%