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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
Consolidated Statements of Comprehensive Income |  |  |
Net unrealized holding gains (losses) on securities available for sale arising during period, tax effects | $ 2,701 | $ 35,960 | $ (11,300)
Reclassification adjustment for gains on securities available for sale included in net income, tax effects | (13,456) | (6,050) | (11,623)
Reclassification adjustment for impairment charges on available for sale securities included in net income, tax effects | $ 364 | $ 342 | $ 2,946

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