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Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Changes In Stockholders' Equity [Abstract] |  |  |
Unrealized net holding gain (loss) on cash flow hedge, tax | $ 276 | $ (53) | $ 159
Unrealized net holding gain (loss) on securities available-for-sale, tax | (1,318) | (8,078) | (815)
Cash dividends on common stock per share | $ 3.76 | $ 3.76 | $ 3.76
Change in funded status of pension plan, tax | $ (2,707) | $ (1,370) | $ 3,383

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