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Consolidated Statements of Changes in Shareholders' 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 Shareholders' Equity [Abstract] |  |  |
Net change in unrealized gain/loss on securities available-for-sale, tax | $ 3,378 | $ 162 | $ 1,786
Cash dividends declared (in dollars per share) | $ 1.23 | $ 1.21 | $ 1.20

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