Shareholders' Equity (Details) (USD $)	3 Months Ended				3 Months Ended			3 Months Ended				1 Months Ended			3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Nov. 15, 2011	Mar. 31, 2013 Series B Preferred Stock [Member]	Mar. 31, 2013 Common Stock [Member]	Apr. 16, 2010 UST [Member] Series A Preferred Stock [Member]	Apr. 02, 2010 UST [Member] Series A Preferred Stock [Member]	Mar. 31, 2013 UST [Member] Series B Preferred Stock [Member] Director	Dec. 31, 2012 UST [Member] Series B Preferred Stock [Member]	Apr. 02, 2010 UST [Member] Series B Preferred Stock [Member]	Apr. 16, 2010 UST [Member] Series B Preferred Stock [Member] Amended and Restated Warrants [Member]	Apr. 30, 2010 UST [Member] Common Stock [Member] Amended and Restated Warrants [Member]	Apr. 16, 2010 UST [Member] Common Stock [Member] Amended and Restated Warrants [Member]	Dec. 12, 2008 UST [Member] Common Stock [Member] Amended and Restated Warrants [Member]	Mar. 31, 2013 Dutchess [Member] Common Stock [Member]	Dec. 31, 2012 Dutchess [Member] Common Stock [Member]	Dec. 31, 2011 Dutchess [Member] Common Stock [Member]	Dec. 31, 2010 Dutchess [Member] Common Stock [Member]	Jul. 07, 2010 Dutchess [Member] Common Stock [Member]
Class of Stock [Line Items]
Series A Fixed Rate Cumulative Perpetual Preferred Stock (in shares)							72,000
Liquidation preference (in dollars per share)							$ 1,000			$ 1,000
Warrants issued to purchase common stock (in shares)													346,154	346,154
Series B Preferred Stock issued (in shares)	74,426	74,426									74,426
Warrants, exercise price (in dollars per share)													$ 7.234
Amended warrants expiration date												Dec. 12, 2018
Accrued dividends						$ 2,400,000		$ 11,800,000	$ 10,700,000
Annual dividend rate (in hundredths)								5.00%
Future annual dividend rate (in hundredths)								9.00%
Number of additional directors that could be elected								2
Annual cash dividends on preferred stock								4,300,000
Annual cash dividend payable after December 13, 2013								7,800,000
Terms of Series B Preferred Stock [Abstract]
Amount of common stock in exchange of trust preferred securities								40,000,000
Minimum redeemable preferred stock				18,600,000				100,000,000
Numerator of common shares fraction (in dollars per share)								$ 750
Denominator of common stocks fraction (in dollars per share)								$ 7.234
Series B Preferred Stock convertible number of common stock (in shares)								9,400,000
Period of mandatory conversion of Series B Preferred Stock								seventh anniversary (April 16, 2017)
Numerator of common stock fraction upon mandatory liquidations (in dollars per share)								$ 1,000
Accrued dividend (in dollars per share)								$ 158	$ 144
Maximum number of common stock to be issued on conversion (in shares)								14,400,000
Preferred stock redemption price (in dollars per share)								$ 1,000
Period used to determine price of stock								20 days
Percentage of preferred stock that can be redeemed (in hundredths)								25.00%
Aggregate liquidation amount (in hundredths)								5.00%
Updated guidance amount								100,000
Minimum amount required for liquidation								3,700,000
Commitment to purchase common stock																			15,000,000
Period committed to purchase common stock															36 months
Discount on sales price of common stock (in hundredths)																			5.00%
Number of shares sold (in shares)					1,400,000										170,000	450,000	430,000	350,000
Aggregate purchase price of common stock sold															4,200,000
Number of shares that require shareholder approval to sell (in shares)															2,600,000
Additional funds available															$ 10,800,000
Shareholders with certain limited exceptions (in hundredths)			5.00%
Number of Series C Junior Participating Preferred Stock purchase by each right	1/1000
Discount to current market price of the common stock (in hundredths)			50.00%
Beneficial ownership level (in hundredths)			4.99%