Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)

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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash dividends declared:      
Common stock, Cash dividend per share $ 0.16 $ 0.10 $ 0.04
Series A Preferred Stock [Member]
      
Cash dividends declared:      
Preferred stock dividend per share $ 85.00 $ 85.00 $ 85.00
Series B Preferred Stock Fixed [Member]
      
Cash dividends declared:      
Preferred stock dividend per share     $ 48.75
Series B Preferred Stock Variable [Member]
      
Cash dividends declared:      
Preferred stock dividend per share $ 33.14