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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Common dividends declared $ 0.10 $ 0.10
Common stock options exercised   2,969
Issuance of treasury stock to 401(k) plan   25,595
Preferred stock dividends declared, per share $ 14.96  
Additional Paid-in Capital
    
Common stock options exercised   2,969
Issuance of treasury stock to 401(k) plan   25,595
Retained Earnings
    
Common dividends declared $ 0.10 $ 0.10
Preferred stock dividends declared, per share $ 14.96  
Treasury Stock
    
Common stock options exercised   2,969
Issuance of treasury stock to 401(k) plan   25,595