Repurchase Agreements and Other Borrowings (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 fhlb_advances	Dec. 31, 2011	Nov. 21, 2011	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]
Repurchase Agreements and Other Borrowings [Abstract]
Securities Sold under Agreements to Repurchase Increase (Decrease)	$ 20,500,000
Federal Home Loan Bank Advances Short and Long Term, Increase (Decrease)	10,000,000
Number of Federal Home Loan Bank, Advances, Maturities	2
Class of Stock [Line Items]
Preferred Stock, shares subscribed, value								27,500,000
Number of Investors Completing the Required Bank Regulatory Process						4	3
Promissory notes aggregate principal amount			8,250,000
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