Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Series D Fixed Rate Cumulative Perpetual Preferred Stock
Cash dividends accrued, per senior preferred share	$ 50,000	$ 50,000
Series E Fixed Rate Cumulative Perpetual Preferred Stock
Cash dividends accrued, per senior preferred share	$ 50,000	$ 50,000