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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Changes in Stockholders' Equity [Abstract] |  |  |
Other comprehensive income (losses), tax | $ (763) | $ 711 | $ (1,157)
Cash dividend declared per share (in dollars per share) | $ 1.10 | $ 1.00 | $ 0.91

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