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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract] |  |  |
Unrealized holding gains (losses) during the period, income tax expense | $ 86 | $ 811 | $ 486
Reclassification adjustment for gains realized in net income, income tax expense | $ 50 | $ 77 | $ 56

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