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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Changes in Shareholders' Equity [Abstract] |  |  |
Net change in unrealized gain/loss on securities available-for-sale, tax | $ (1,336) | $ (3,378) | $ 162
Cash dividends declared (in dollars per share) | $ 1.25 | $ 1.23 | $ 1.21

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