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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash dividends      
Preferred stock stated dividend rate (in hundredths) 5.00% 5.00% 5.00%
Issuance of shares of common stock (in shares) 454,842 432,797 5,454,669
Share based compensation, common stock (in shares) 147,364 198,246