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Condensed Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) (USD $) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Common dividends declared, per share | $ 0.12 | $ 0.10
Preferred dividends declared, per share | $ 15.00 | $ 15.00
Common stock options exercised, shares | 800 |
Purchase of treasury shares | 69,054 |
Treasury stock shares acquired cost per share | $ 15.55 |

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