Repurchase Agreements and Other Borrowings (Details) (USD $)
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9 Months Ended | |||||||
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Sep. 30, 2012
fhlb_advances
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Dec. 31, 2011
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Nov. 21, 2011
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Jun. 28, 2012
Series C Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series C Convertible Preferred Stock [Member]
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May 13, 2011
Series C Convertible Preferred Stock [Member]
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Mar. 02, 2011
Series C Convertible Preferred Stock [Member]
investors
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Feb. 11, 2011
Series C Convertible Preferred Stock [Member]
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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 |